118 results found.
... Science Frontiers ONLINE No. 68: Mar-Apr 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Magnetic bacteria in the soil and who knows where else?It is already well-established that saltand fresh-water sediments harbor bacteria that synthesize grains of magnetite - presumably for the purpose of sensing the ambient magnetic field and orienting themselves. Similar bacteria have recently been discovered living in ordinary soil in Bavaria. It is near-certain that they will now be found just about everywhere. J.W .E . Fassbinder et al, who reported the Bavarian bacteria, conclude their Abstract with: "We suggest that the magnetic bacteria and their magnetofossils can contribute to the magnetic properties of soils." (Fassbinder, Jorg W.E ., et al; "Occurrence of Magnetic Bacteria in Soil." Nature, 343:161, 1990.) Comment. It is easy to reach great heights of speculation given the facts that: (1 ) magnetic bacteria exist; (2 ) bacteria in general are exceedingly abundant; and (3 ) bacteria are found deep inside the earth's crust and, seemingly, just about anywhere one cares to look. Now, let's see how ridiculous one can get: Magnetic bacteria and/or their fossils contribute heavily to the magnetic properties of sedimentary rocks and unlithified sediments, such as deep-sea sediments. In fact, magnetostratigraphy and paleomagnetism in general may be based upon bioartifacts and be suspect. Magnetic bacteria and/or their fossils are present in such immense ...
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... Science Frontiers ONLINE No. 58: Jul-Aug 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Bacteria One dictionary's definition: "Widely distributed group of microscopic, one-celled vegetable organisms..." As a matter of fact, the nearly universal image of a bacterium is that of a simple, single-cell organism. But: "That view is now being challenged. Investigators are finding that in many ways an individual bacterium is more analogous to a component cell of a multicellular organism than it is to a free-living, autonomous organism. Bacteria form complex communities, hunt prey in groups and secrete chemical trails for the directed movement of thousands of individuals." J.A . Shapiro, author of the preceding quote, attributes the simplistic picture of bacteria to medical bacteriology, in which disease-causing bacteria are classically identified by isolating single cells, growing cultures from them, and then showing that they cause the disease in question. In the microscopic real world, bacteria virtually always live in colonies, which possess collective properties quite different and much more impressive than those of the single-cell-in-a -dish! That old human urge for reductionism has led us astray again. Shapiro seeks to remove the blinders of reductionism in a wonderful article in the June, 1988, issue of Scientific Amer can . We have room here to mention only the Myxobacteria, many of which never exist as single cells in nature. Even those that do are "social" in the sense that ...
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... Science Frontiers ONLINE No. 15: Spring 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects If bacteria don't think, neither do we As one goes step-by-step down the ladder of biological complexity, one discovers that flatworms, plants, and even bacteria display purposeful behavior. Bacteria, which are usually regarded as fairly inert when it comes to responding to environmental pressures, actually react in different ways to dozens of different stimuli. This ability at the very least requires sensory equipment, internal clocks, a memory, and a decision-making capability. If bacterial activity is all preprogrammed (the reductionist view), are not humans also preprogrammed? Human programs are larger and more complex, of course, but still devoid of "thinking." Conversely, if humans really do think; that is, transcend preprogramming (free will, if you wish), then bacteria must also think. The third possibility is that at some step in the ladder of life, "higher" life forms begin to think. There is little evidence that life is split so profoundly between thinkers and non-thinkers. (Morowitz, Harold J.; "Do Bacteria Think?" Psychology Today, 15:10, February 1981.) Comment. This ancient controversy about determinism has been revived as: (1 ) Simple life forms have been found to be not-so-simple; (2 ) All life seems unified by a single (or small number of) genetic codes; and (3 ) " ...
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... Science Frontiers ONLINE No. 105: May-Jun 1996 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Nether Universe Of Life Bacteria well-adapted to high temperatures have been brought up from oil wells thousands of miles apart. All indications are that these bacteria are indigenous to the wells; that is, not introduced by the drilling fluids. What is most interesting is the fact that these bacteria are all closely related despite their remoteness from each other. They not only look and behave alike, but they also share 98.2 % of their 16S ribosomal RNA sequences. M. Magot asks what an anomalist would ask. "For example, where are these bacteria from? How did they succeed in colonizing these habitats?...Are these microorganisms directly descended from bacteria that were trapped during the formation of the oil, or accompanied its migration through tens to hundreds of millions of years? Did they arrive in the oil field later as a consequence of aquifer activity? What is their mode of maintenance and development in their environment?" (Magot, Michel; "Similar Bacteria in Remote Oil Fields," Nature, 379:681, 1996) Comment. Bacteria have also been extracted from mineral-charged fluids circulating in drill holes over 12 kilo meters deep and also in deep aquifers. There must be an unexplored universe of life thriving not only beneath our feet but also - quite possibly - beneath the forbidding surface of Mars. Reference. Examples of life thriving at great depths in the earth may be found ...
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... Science Frontiers ONLINE No. 125: Sep-Oct 1999 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Tyrannies Of The Tiny Because we cannot see them with the naked eye, we tend to forget that the earth's atmosphere, its oceans, and the solid crust to unknown-but-great depths are colonized in profusion by minute biological entities -- mainly bacteria and viruses. Only when we get the flu or infected finger do these entities impinge upon our consciousness. Below we will learn that there are many more of them than you think. Do viruses control the oceans? You may avoid the beaches after you learn that one teaspoon of seawater typically contains 10-100 million viruses and onetenth that many bacteria. Obviously, most are harmless to humans. However, the viruses do infect the bacteria and phytoplankton, destroying them, and thereby releasing their nutrients. By doing this, they keep the oceans' biological engines running. Further, the viruses act as genetic engineers as they transfer DNA from one individual to another. The oceans may be viewed as vast test tubes in which biodiversity is maintained by teeming, invasive viruses. (Suttle, Curtis A.; "Do Viruses Control the Oceans?" Natural History, 108:48, February 1999.) We are only 10% human! The average human body contains 100 trillion cells, but only 1 in 10 of these cells is your own. The remaining 90% are bacteria. These alien organisms coat your skin and pave your inner passageways from mouth ...
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... Science Frontiers ONLINE No. 95: Sep-Oct 1994 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Might diamonds be dead bacteria?How can something as beautiful, pure, and crystalline as a diamond be made from dead, disgusting bacteria? In truth, all diamonds are full of impurities and curious microscopic structures. (See: "Diamonds Are an Anomalist's Best Friend" in SF#92.) The main constituent of diamonds is carbon, but even chemically pure carbon is contaminated in a sense. The contaminant is light carbon; that is, C12 , which is an isotope used preferentially by living organisms. Some diamonds, it is found, contain anomalously large fractions of C12, which suggests they have an organic origin. Some diamonds also contain sulfide inclusions that have sulphur-isotope ratios also symptomatic of a biological origin. The specific diamonds suspected to have an organic origin are the so-called "eclogitic" diamonds. These diamonds may have obtained their carbon and impurities from bacterial communities that once lived around hydrothermal vents that existed along ancient mid-ocean ridges. Subsequent metamorphism (heat and pressure) turned the masses of bacteria into eclogitic diamonds. So, those sparklers of yours may just be clumps of billion-year-old bacterial corpses! (Nisbet, E.G ., et al; "Can Diamonds Be Dead Bacteria?" Nature, 367:694, 1994.) Definition. Eclogites comprise a class of metamorphic rocks formed at extremely high temperatures and pressures. From Science Frontiers # ...
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... Science Frontiers ONLINE No. 57: May-Jun 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Subterranean life! (part 3)We almost forgot this recent tidbit from Science News that mentions microscopic life forms: "In recent years, scientists have found bacteria, as far down as 1,150 feet, in wells that penetrate deeply buried aquifers -- porous layers of rock that hold underground water. Such finds have forced hydrologists to question their traditional belief that deep aquifers were devoid of life. But it was not clear whether these bacteria were native residents of the aquifers or just contaminants from the world above, living solely within the wells. Moreover, no one had established how the bacteria were affecting the environment, if at all." Experiments have now shown that these subterranean bacteria are indigenous and are important to groundwater chem istry. The bacteria feed on organic molecules and display a curious propensity for metabolizing the carbon-13 isotope rather than carbon-12. Thus, carbon dissolved in some deep aquifer water is enriched in carbon-13 compared to surface water. None of the bacteria found so far seems dangerous to humans. (Monastersky, R.; "Bacteria Alive and Thriving at Depth," Science News, 133: 149, 1988.) Comment. Subterranean bacteria may be associated with the creation of oil and natural gas. From Science Frontiers #57, MAY-JUN 1988 . 1988-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 85: Jan-Feb 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Biogeology It is accepted that every cubic centimeter of the topsoil beneath our feet seethes with thousands of microorganisms. It is less well known that life's domain extends down much further. The hard rocks and strata of earth's crust -- seemingly sterile and inert -- are continuously being transformed by bacteria and other life forms. In fact, it was easy to find three examples of such processes from the literature collected from the past two months. Although the discoveries reported below may seem dull to anomalists ued to more exciting fare, it may well be that life from "inner space" has been and will be more important to humankind than life from "outer space," as implied in third item! Bacteria and placer gold. "Lacelike networks of micrometresize filiform gold associated with Alaskan placer gold particles are interpreted as low-temperature pseudomorphs of a Pedomicrobium -like budding bacterium. Submicron reproductive structures (hyphae) and other morphological features similar to those of Pedomicrobium occur as three-dimensional facsimiles in highpurity gold in and on placer gold particles from Lillian Creek, Alaska." In short, bacteria help create placer gold deposits. The author believes that bacterioform gold is widespread. (Watterson, John R.; "Preliminary Evidence for the Involvement of Budding Bacteria in the Origin of Alaskan Placer Gold," Geology , 20:315, 1992.) Microorganisms and iron deposits. At least 500 million years ago ...
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... Science Frontiers ONLINE No. 113: Sep-Oct 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Who's In Charge Down There?A microscopic ecosystem thrives in your intestines. This menagerie of tiny organisms boasts more than 400 species of bacteria. Not all of these bacteria are content to wait around until we eat something that they like. Molecular biologist P. Falk and colleagues discovered that some of the bacteria inhabiting the intestines of mice send chemical directives to the mouse's intestinal cells, causing them to synthesize those sugars the bacteria require. Since the bacteria that make a living in the intestines of mice are very similar to those in humans, the same phenomenon is probably occurring in your innards as you read this. (Anonymous; "Bac Talk," Discover, 18:23. February 1997.) Comments. There doesn't seem to be much you can do about your presumptuous intestinal bacteria. Maalox won't dissuade them. Even though we are infected with bossy bacteria and bend to the commands of "selfish genes", we still imagine we possess free will! From Science Frontiers #113, SEP-OCT 1997 . 1997-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 130: JUL-AUG 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Has Human Evolution Been Directed by Bacteria?With considerable fanfare, a multinational team of scientists has announced that the mtDNA (mitochondrial DNA) "squeezed" from a 29,000-year-old Neanderthal skeleton found in the northern Caucasus differs by 3.48% from the mtDNA of a 40,000-year-old Neanderthal skeleton from (fittingly) Germany's Neander Valley. Furthermore, both mtDNA samples differ from that of modern humans by a substantial 7%. These two innocent-appearing, widely publicized numbers have far-reaching implications: Modern humans and Neanderthals are only very distantly related, and they certainly never interbred, as suggested in many recent, popular articles; and Since neither Neanderthal mtDNA sample is closer to that of modern Europeans than it is any other modern human population, the so-called "multiregional" theory of human evolution and dispersion is unlikely to be correct. Thus, the out-of-Africa theory is favored;. These data and their implications stimulate several observations and comments; only one of which is mentioned in the references given below. F.H . Smith, an anthropologist from Northern Illinois University and a supporter of the multiregional theory, opines that 30,000-40,000 years ago the mtDNA of the early humans, who were mixing it up with the Neanderthals, was certainly very different from what it is today. Since mtDNA mutates rapidly, ...
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... -swallowing leviathan. (Griffin, D.J .G ., and Yaldwyn, J.C .; "Giant Colonies of Pelagic Tunicates..," Nature, 226:464, 1970) Slime molds. Moving down life's ladder to even smaller and simpler organisms, some amoebas have a bizarre life cycle that ends as a superorganism called a "slime mold." If you viewed an amoeba through the microscope in biology lab, you know that they are very tiny, very simple, and most certainly not very bright. But given enough food, some species of amoeba divide and keep dividing until they clump together in a "slug" that sends out streamers and sort of flows along the surface. We now have a mobile superorganism searching for food (mostly bacteria). Eventually, the moving colony of amoebas anchors itself. Some of the superorganism's cells specialize to create a stalk called a "fruiting body." The amoebas in the fruiting body change into spores and are wafted away on the wind. In this way, the simple, lowly amoebas are transformed into a radically different entity. One wonders how this superorganism, this slime mold, is controlled. Where are its sensors and its information processing center, if it possesses one? (Stewart, Ian; "Spiral Slime," Scientific American, 283:116, November 2000.) This question becomes more difficult to answer when we learn that slime molds can display rudimentary intelligence in the sense that they can solve mazes in their search for food. They are not as ...
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... Science Frontiers ONLINE No. 29: Sep-Oct 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Life beyond 100 c Bacteria can survive and multiply in hot springs near and slightly above 100 C -- the boiling point of water at atmospheric pressure. Few scientists have contemplated the possibility of life forms prospering at temperatures well beyond 100 . Recently, however, the discovery of many new and frequently bizarre organisms clustered around deep-sea vents has forced a reexamination of high-temperature life. It seems that bacteria actually flourish in the 350 C water streams from the deep-sea vents. In the lab, these same bacteria multiply rapidly in water at 250 C kept liquid by pressures of 265 atmospheres of pressure. What a surprise! Quoting a concluding sentence from this article: "This greatly increases the number of environments and conditions both on Earth and elsewhere in the Universe where life can exist." (Baross, John A., and Deming, Jody W.; "Growth of 'Black Smoker' Bacteria at Temperatures of at Least 250 C," Nature, 303:423, 1983.) Comment. Ignoring for the moment the extraterrestrial possibilities, the earth is riddled like a Swiss cheese with hot, fluid environments, which we may now consider potential abodes of life. Subterranean life represents a new biological frontier. Who knows what kinds of organisms have developed to feed upon the planet's heat? Could they have con-tributed to our supplies of petroleum and natural gas? From Science Frontiers # ...
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... Science Frontiers ONLINE No. 60: Nov-Dec 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Purposeful evolution?One seemingly unassailable dogma of evolutionary biology insists that natural selection involves, first, the continuous, random, environment-independent generation of genetic mutations; and, second, the subsequent fixation of those mutations that are favored by prevailing conditions. In other works, the genetic mutations cannot be influenced by external events and conditions. But in recent experiments with bacteria (E . coli), J. Cairns et al, at the Harvard School of Public Health, find they actually do produce mutations in direct response to changes in their environment. The adjective "purposeful" has even been applied to the action of these bacteria! Can anything be more heretical? "One of the experiments involves taking colonies of E. coli that are incapable of metabolizing lactose and exposing them to the sugar. If the lactose-utilizing mutants simply arise spontaneously in the population and are then favored by prevailing conditions, then this would lead to one pattern of new colony growth. A distinctly different pattern is produced if, under the new conditions, the rate of production of lactose-utilizing mutants is enhanced. The observation is something of a mixture of patterns, indicating that directed mutation appears to be occurring. 'This experiment suggests that populations of bacteria...have some way of producing (or selectively retaining) only the most appropriate mutations,' note Cairns and his colleagues." (Lewin, Roger; "A Heresy ...
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... Science Frontiers ONLINE No. 31: Jan-Feb 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Early Life And Magnetism The tiny granules of magnetite found in magnetized sediments come in various crystalline forms. Inorganic magnetite precipitated from molten rock is octahedral, while the particles manufactured by bacteria are cubes, hexagonal prisms, or noncrystalline teardrops. The magnetite found in marine sediments appears to be organically formed -- at least the shapes of the particles are characteristic of bacterial manufacture. Apparently these industrious bacteria have been busy producing magnetite ever since "lowly" life forms appeared in the Precambrian. These facts pose at least four questions: How much of the earth's iron ore has been concentrated biologically and is there a connection with the Gaia Hypothesis? Is it possible that magnetic field reversals, now believed to be of purely geophysical origin, might be biological artifacts (that is, due to population and/ or species changes of magnetic bacteria)? If magnetic field reversals are of geophysical origin, how do the magnetic bacteria find their food sources during the long periods of near-zero field? Lab experiments prove that magnetic bacteria require free oxygen to secrete magnetite, but the Precambrian atmosphere and oceans were supposedly devoid of oxygen until 2.3 billion years ago. How did the magnetic bacteria prosper before then? (Simon, C.; "Tiniest Fossils May Record Magnetic Field," Science News, 124:308, 1983.) From Science Frontiers #31, JAN-FEB 1984 . 1984-2000 William R. ...
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... Science Frontiers ONLINE No. 96: Nov-Dec 1994 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects "ADAPTIVE" MUTATION Six years ago, J. Cairns performed experiments with bacteria that implied that said bacteria could "direct" their own mutations so that they could cope more speedily with sudden environmental trauma. (SF#64) In Cairns' experiments, bacteria unable to digest lactose were presented with an all-lactose diet. They quickly acquired the mutations needed to digest the only food available. They did not have to wait for random mutations to accidentally hit upon the correct genome changes. A firestorm spread across the scientific community, even though other researchers saw similar effects. It was traumatic! One of science's foundation stones was at risk. The current theory of biological evolution insists that all mutations are random. Cairns believed he had shown that his bacteria experienced only useful mutations. This claim was too awful to accept. In the July 21, 1994, issue of Science, two new papers appeared that, while not proving that only useful mutations occur in Cairns-type experiments, do indicate that something unusual is indeed happening. Basically, when bacteria are under stress (say, starving), a "distinctive" type of mutation occurs! Is "distinctive" a code word for "non-random"? The title of the commentary accompanying the two articles says it all. (Culotta, Elizabeth; "A Boost for 'Adaptive' Mutation," Science, 265:318, 1994. ...
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... Science Frontiers ONLINE No. 18: Nov-Dec 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Life's origin within the earth?Biologists usually hark back to warm, sunlit swamps and tidal pools when contemplating the origin of life. Lately, Hoyle has proposed a cosmochemical origin (see OR DID IT DRIFT IN FROM WITHOUT? ). Few look within the earth. Yet, when Mt. St. Helens erupt-ed it essentially sterilized all lakes and ponds in the immediate area as far as known life forms were concerned, and then introduced previously unknown chemosynthetic bacteria. At least, this is one interpretation. Scientists at Oregon State University found the waters around the volcano to be teeming with these bacteria, up to a billion per drop. The bacteria resemble nothing in the local soil but do seem related to bacteria existing around Precambrian volcanos. (Anonymous; "Secrets of Life in a Volcano?" Boston Globe, July 14, 1981.) Comment. Were the new bacteria in the volcanic ejecta or had they just gone unnoticed in the soil? Could the hot rocks, geothermal brines, and restless magmas beneath our feet be the real cradle of terrestrial life, with photosynthesis-dependent surface species being relatively unimportant to the big picture? From Science Frontiers #18, NOV-DEC 1981 . 1981-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 46: Jul-Aug 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Halley's comet infected by bacteria?" Halley's comet is coated with organic molecules. Two astronomers working with the Anglo-Australian Telescope, David Allen and Dayal Wickramasinghe, have found strong evidence in an infrared spectrum of the comet, taken two weeks ago. The spectrum, spanning the wavelengths 2-4 micrometres, shows a prominent feature centred at 3.4 micrometres which the two astronomers attribute to emission by carbon-hydrogen bonds in a solid." Chandra Wickramasinghe (Dayal's brother) states that the emissivity of Halley's comet matches exactly the emissivity of bacteria as observed in the laboratory. This observation supports the Hoyle-Wickramasinghe suggestion that comets transport life forms around the universe. Of course, more conservative scientists contend that rather complex organic molecules can be synthesized in space abiogenically. These molecules might account for the observations. (Chown, Marcus; "Organics or Organisms in Halley's Nucleus," New Scientist, p. 23, April 17, 1986.) Comment. This article seems to be accompanied by a bit of scientific revisionism. In response to this discovery, one English scientist remarked that these results, ". .. only confirm what everyone has always suspected." Now, it is true that comets have long been termed "dirty snowballs" but until very recently no one has maintained that comets are covered with dark, organic sludge. Reference. In category ...
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... Science Frontiers ONLINE No. 67: Jan-Feb 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Microorganisms complicate the k-t boundary Ancient bacteria, it appears, have tampered with the K-T (Cretaceous-Tertiary) boundary of some 65 million years ago. A key marker of this boundary is a thin "spike" of iridium that is found worldwide, and which was supposedly deposited by the asteroid impact that helped finish off the dinosaurs. For many scientists, the asteroid-impact scenario has become a "non-negotiable" brick in the Temple of Science. The problem they have faced is that the iridium layer is variable in thickness and concentration from site to site. Sometimes iridium can be detected well above and below the K-T boundary. This variability has tended to undermine the asteroid-impact theory. Recent experiments at Wheaton College by B.D . Dyer et al have demonstrated that bacteria in ground water can both concentrate and disperse iridium deposits. In other words, bacteria could smear out an iridium spike, perhaps partially erase it, or even move it to a deeper or shallower layer of sediment. (Monastersky, R.; "Microbes Complicate the K-T Mystery," Science News, 136: 341, 1989.) Comment. An obvious question now is how bacteria might have affected other chemicals, such as oxygen and carbon isotopes, widely used in stratigraphy. From Science Frontiers #67, JAN-FEB 1990 . 1990-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 79: Jan-Feb 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Deeply-buried life West-to-east profile of the Florida-Bahamas carbonate platform. Deep in the Gulf of Mexico, along the edge of the great carbonate platform that breaks the surface as Florida and the Bahamas, thrives a diverse community of animals that does not depend upon the sun for energy. Instead, they feast on carbohydrates provided by symbiotic bacteria. Since there are no ocean-floor vents spewing mutrients and hot water in the area, scientists have wondered where these bacteria obtain the methane and sulfides that nourish them. C.S . Martens and C.K . Paull, of the University of North Carolina, propose that bacteria living miles down within the carbonate platform generate the methane and sulfides as they consume organic matter buried long ago in the limestone. These excreted, energy rich gases and fluids seep upward and outward, sustaining biological communities along the edge of the platform. (Monastersky, R.; "Buried Rock, Bacteria Yield Deep-Sea Feast," Science News, 140:103, 1991.) Comment. (1 ) Looking far back in time, the sun was, of course, the energy source, because it helped create the buried organic matter. (2 ) However, there is always the possibility that the methane seeping out of the earth is abiogenic. See BLACK GOLD -- AGAIN under Geology . (3 ) How deeply into the crust has life penetrated ...
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... . She says, "The stakes in this dispute are high, indeed. If directed mutations are real, the explanations of evolutionary biology that depend on random events must be thrown out. This would have broad implications. For example, directed mutation would shatter the belief that organisms are related to some ancestor if they share traits. Instead, they may simply share exposure to the same environmental cues. Also, different organisms may have different mutation rates based on their ability to respond to the environment. And the discipline of molecular taxonomy, where an organism's position on the evolutionary tree is fixed by comparing its genome to those of others, would need extreme revision." What sort of experiment did Cairns do to cause such a ruckus? In particular, he studied E. Coli bacteria. Normally, these bacteria cannot metabolize the sugar lactose. Cairns exposed the E. Coli to a sudden dose of lactose, demonstrating that if the bacteria must have lactose to survive, they quickly cast off the two genes that inhibit their metabolizing of lactose. Of course, the experiments were more complicated than this, but the fundamental finding was that the bacteria mutated so that they could use lactose much, much faster than chance mutation would permit, stastically speaking. The battle lines are forming. A sup-porter of directed mutation, J. Shapiro, of the University of Chicago, is quoted as follows in Moffat's article: "The genome is smart. It can respond to selective conditions. The signifi cance of the Cairns paper is not in the presentation of new ...
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... whole ocean systems . . Gel is like the dark matter of the sea. While sea gel does not impede the snorkeler, . it does herd microbes into clumps or microniches . which we cannot see either. These microbes. in effect, exist in a tangled. 3-D mesh that affects not only their movements but also those of their prey and predators. A few statistics confirm the amazing complexity of the seawater microcosm and its incredibly high microbe population density. The long strands in the oceanic gel are mostly crosslinked polysaccharides. If the polysaccharides in 1 milliliter of seawater could be placed end-to-end, they would stretch out to 5,600 kilometers! Coexisting proteins would span 310 kilometers ; DNA, 2 kilometers. This same milliliter may also contain up to a million bacteria and ten times as many virus particles. Also in this brew are, on the average, 1.000 protozoans and 100 phytoplankton. It's a microscopic metropolis, about the size of a sugar cube, and one in which you may never wish to swim again! The polysaccharides and proteins that comprise most of the thin goo are not alive, although the bacteria are. Just how this thin goo and its multitudinous inhabitants evolved has not been explained. Which came first, the goo or the bacteria? Being devoid of life's spark, the goo cannot evolve, or can it? (LaFee, Scott; "Meet Me at the Goo," New Scientist, p. 44, November 25, 2000.) Comment. Do similar microcosms thrive in freshwater ...
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... Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Hypermutation rather than directed mutation?The year 1988 saw a flurry of excitement over the purported discovery of "directed mutation" in the laboratory; that is, mutations of organisms that seemed goal-directed rather than random and independent of environmental pressures. The concept of directed mutation is counter to prevailing biological dogma, and, naturally, this research bore severe scrutiny. Objections and arguments against directed mutation arose, but the original research was never shown to be faulty. New experiments along this line, by B. Hall at the University of Rochester, have supported the original Harvard work and refuted some of the objections that had been leveled. Working with a special strain of Escherichia coli , Hall starved the bacteria of a certain amino acid, (tryptophan) that they usually got from the environment and could not synthesize. In the days that followed, many of the bacteria mutated so that they could synthesize their own tryptophan. Hall concluded: "Mutations that occur more when they're useful than when they're not: That I can document any day, every day, in the laboratory." Rather than assign any "conscious" goal-seeking attributes to the bacteria, Hall prefers to think that the environmental stress induced a state of "hypermutation." In this state all sorts of mu-tations occurred in abundance. Only those that synthesized tryptophan survived the starvation program; even potentially favorable mutations died quickly. (Stolzenburg, W.; "Hypermutation: Evolutionary Fast Track ...
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... Science Frontiers ONLINE No. 61: Jan-Feb 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Gaia At Work Under The Hudson "Oxygen-starved bacteria working in sediment beneath the Hudson River are transforming toxic PCB compounds into less dangerous forms, raising hopes of a significant easing of a major PCB cleanup problem nationwide," researchers said yesterday. "The resulting types of PCBs do not accumulate in living tissue, a government scientist said." Researchers at the University of Michigan stated that it appeared that these bacteria had evolved specifically to attack PCBs. (Anonymous; "Hudson Bacteria Transform PCBs into Safer Forms," Baltimore Sun, November 4, 1988.) Comment. Thus does Gaia act so as to protect humanity from its own mistakes! From Science Frontiers #61, JAN-FEB 1989 . 1989-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 20: Mar-Apr 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A TALE OF TWO ECOSYSTEMS -- OR MAYBE MANY MORE Comment. It was quite fortuitous that the following two pieces, found on the same day, fit together so nicely. (Nature is fortuitous!) A group of scientists studying termites have isolated over 100 species of protozoa and bacteria living cooperatively inside the termites gut. Some of the bacteria even live inside the protozoa and other bacteria forming ecosystems of several symbiotic levels within each termite. Each termite itself is part of a complex social "superorganism," the termite colony. That termites had bugs in-side them has long been known; but the new-found complexity and interdependency of life systems within life systems is remarkable. The researchers believe that the life forms inside the termite work together to create the uniform internal environment needed by all inhabitants, just as the termites themselves cooperate to maintain a favorable environment inside their hill. (Anonymous; "And Littler Bugs Inside 'Em," Scientific American, 246:78, February 1982.) The termites, though, are only part of a much larger ecosystem, the earth itself. J.E . Lovelock, in his Gaia, A New Look at Life On Earth, has observed that our planet's environment has actually changed little down the eons despite solar variations. Lovelock's hypo thesis is that all terrestrial life -- animals, plants, termites, etc -- work sym biotically ...
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... Issue Sourcebook Project Sourcebook Subjects "Uprooting the Tree of Life"Yes, that is the title of a long article in the February 2000 issue of Scientific American. In the Table of Contents, we see words concerning this article that we never thought would be permitted in a mainstream science magazine. After first noting that 10 years ago it was generally agreed that all organisms evolved from a single ancestral cell that existed about 3.5 billion years ago, there comes the assertion that the Tree of Life: "is far more complicated than was believed and may not have had a single root at all." The article proper relates how the Tree of Life has its own evolutionary history. Twenty years ago, scientists had that single ancestral cell splitting into two main trunks: the prokaryotes (bacteria) and the eukaryotes (every-thing else). More recently, a third trunk has been grafted onto the Tree; namely, the archaea (microorganisms that look like bacteria but possess markedly different genes). The archaea favor extreme environments and, curiously, are more closely related to you and me than are the bacteria. But according to this article (by W.F . Doolittle), the triple-trunked Tree of Life is simplistic. One reason for this is that genes, once thought to flow only from parent to progeny, are now known to travel laterally. Species barriers are broken. Genes jump from trunk to trunk, from branch to branch, twig to twig. Of course, these jumps are seen primarily among the microorganisms. The real Tree of ...
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... glow which was not unlike viewing the negative of a photograph." The milky sea is a rather common phenomenon. In fact, the British Meteorological Office has established a Bioluminescence Database, which presently contains 235 reports of milky seas seen since 1915. P.J . Herring and M. Watson have employed this Database in a review paper on these impressive displays. Geographical plotting of the reports shows a strong concentration in the northwest Indian Ocean (see figure). Seasonally, there is a strong peaking in August and a secondary blip in January. The phenomenon is independent of water depth and distance from land. Surely bioluminescent organisms must be the explanation for milky seas. But most such organisms simply flash briefly and are incapable of generating the strong, steady glow of the milky sea. Marine bacteria alone glow steadily. However, calculations show that unrealistic concentrations of bacteria would be needed to generate the observed light. Furthermore, samples from the affected waters show no such bacteria. Herring and Watson admit there is no acceptable explanation of the milky sea. What, they ask, is so special about the northwest Indian Ocean? Why do milky seas not occur in the adjacent Red Sea and Persian Gulf? These bodies of water seem equally promising. (Herring, P.J ., and Watson, M.; "Milky Seas: A Bioluminescent Puzzle," Marine Observer, 63:22, 1993.) From Science Frontiers #86, MAR-APR 1993 . 1993-2000 William R. Corliss ...
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... divers cannot see beyond a few feet. Measured in millimeters, the marine snowflakes are much larger than the average interplanetary dust particles (but of course interplanetary dust itself is also a constituent of marine snow). The bigger marine snowflakes -- over 0.5 mm -- are a major food source for deep-sea denizens waiting below for this manna from the watery heaven. The reason for mentioning marine snow in Science Frontiers is that biologists like Alldredge are really pio-neering new territory, where new anomalies must surely dwell. "' We've essentially discovered a whole new class of particles in the ocean that no one knew was there," she exults. .. .. . "' They're islands, really, where the metabolic activities of algae, bacteria, and protozoans produce unique chemical environments,' says Alldredge." To illustrate, the carbon content of bacteria on marine snow is 10,000 times higher than that of bacteria found away from the snow. Why? (Cox, Vic; "It's No Snow Job," Sea Frontiers , 40:42, March/April 1994.) From Science Frontiers #93, MAY-JUN 1994 . 1994-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 66: Nov-Dec 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Care for a cup of viruses?" The concentration of bacteriophages in natural unpolluted waters is in general believed to be low, and they have therefore been considered ecologically unimportant. Using a new method for quantitative enumeration, we have found up to 2.5 x 108 virus particles per millilitre in natural waters. These concentrations indicate that virus infection may be an important factor in the ecological control of planktonic microorganisms, and that viruses might mediate genetic exchange among bacteria in natural aquatic environments." (Bergh, Oivind, et al; "High Abundance of Viruses Found in Aquatic Environments," Nature, 340:467, 1989.) A sip of water could therefore introduce a billion virus particles into your stomach! This level of virus density in natural water is about 10 million times that formerly estimated. Besides reducing your thirst, what are the implications of this discovery? First, it suggests that bacteria in natural waters are probably kept in check by viruses as well as protozoans. So far, this sounds good. Second, since viruses can ferry genetic material between organisms via transduction (i .e ., host DNA is carried to the next host). This means that genes for antibody resistance and increased bacterial virulence (as present in sewage) may be spread quickly and widely. Also, "engineered bacteria" proposed for use in agriculture, viz., the ice-minus bacterium created to protect strawberries, ...
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... Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Microbes Threaten Radiocarbon Dating In the 1980s, skeptics had a lot of fun debunking the Shroud of Turin, the supposed burial cloth wrapped around Christ. Their glee was unbounded when radiocarbon dating "proved" that the shroud could not be older than 700 years. The skeptics may have been too quick to celebrate, because the samples that were sent to the radiocarbon lab may not have been wholly cloth. The reality of our biosphere is that virtually everything is permeated with microbes and their products. S.J . Mattingly and L.A . Garza-Valdes, of the University of Texas at San Antonio, have been studying "biogenic varnishes" for years. These plastic-like coatings are produced by bacteria and fungi. Sure enough, microscopic examination of a few linen fibers from the Shroud of Turin show that they, too, are coated with such varnishes. These biogenic varnishes may introduce carbon that has been recently fixed from the atmosphere and thus make the sample's age appear younger than it really is. (Travis, John; "Microbes Muddle Shroud of Turin's Age," Science News, 147:346, 1995.) Comment. More than the Shroud is at stake here. Bacteria contaminate just about everything, including wood and bone from archeological sites. Bacteria may, therefore, "rejuvenate" samples sent in for radiocarbon dating. The importance of this phenomenon is still unclear. Cross reference. Radiocarbon-dated samples may also appear erroneously "aged" by ...
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... Science Frontiers ONLINE No. 124: Jul-Aug 1999 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Preadaptive Evolution "Preadaptive evolution" is a remarkable concept. Basically, it asserts that in some -- possibly many -- mutations, a useful response to an evolutionary challenge is "naturally" accompanied by useful responses to challenges that have not yet been posed to the life form in question. This prescience verges on the miraculous to the uninitiated, but mainstream biologists seem content to write the phenomenon off as merely good fortune -- like hitting two jackpots in a row on the same slot machine. A good example of preadaptation occurs when bacteria are cultured in the presence of an antibiotic. Within a few weeks, they have evolved a resistance to that particular antibiotic. This well-known phenomenon is easily explained by evolution. However, often the newly evolved (or "adapted") bacteria are also resistant to several other antibiotics that work by different mechanisms. All of the multiple gene changes needed for the several different defense mechanisms are controlled by a single site on the same chromosome. (Levy, Stuart B.; The Antibiotic Paradox , New York, 1992, p. 99. Cr. A. Mebane.) Comments. How can bacteria prepare defenses against antibiotics they have not been exposed to? Luck, prescience, or some unrecognized mechanism? In his Ever Since Darwin , S.J . Gould acknowledges that "preadaptation implies prescience although in actuality it means just the opposite! His explanation of "preadaptation ...
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... Science Frontiers ONLINE No. 43: Jan-Feb 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Exploring The Suberranean World Of Life Examining fluid inclusions in hydrothermal quartz crystals obtained from a drill hole in Yellowstone National Park, K.E . Bargar and his colleagues from the U.S . Geological Survey noted many rodlike and threadlike particles that closely resembled bacteria. Although these partiles move, as if alive, they are only in Brownian motion. But even in death, they tell us that life forms can prosper deep underground at very high pressures and temperatures. The crystals that ultimately grew around the fluid particles came from fractures in Pleistocene rhyolite hundreds of feet below the surface. The authors concluded: "Thermophilic microorganisms may hold the key to an understanding of several biological and geochemical processes, including the origin of life. The discovery of possible microorganisms in these fluid inclusions from the Yellowstone volcanic area enlarges the range of potential environments over which subsequent investigations should be conducted." (Barger, Keith E., et al; "Particles in Fluid Inclusions from Yellowstone National Park -- Bacteria?" Geology, 13:483, 1985.) Comment. It is appropriate to note that similar "organized elements" have been noticed in meteorites for over a century. From Science Frontiers #43, JAN-FEB 1986 . 1986-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 91: Jan-Feb 1994 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The earth's biosphere, 'tis no thin veneer A recurring theme in SF is the three-dimensionality of terrestrial life. Customarily, life is considered confined to a thin spherical shell of air, water, and earth. But the bits of drillers have demonstrated that life prevails as far down as we can pierce the planet's integument. Now, K.G . Stetter et al: ". .. report the discovery of high concentrations of hyperthermophiles [viz., bacteria] in the production fluids from four oil reservoirs about 3,000 metres below the bed of the North Sea and below the permafrost surface of the North Slope of Alaska. Enrichment cultures of sulphidogens grew at 85 C and 102 C, which are similar to in reservoir temperatures." Stetter et al favor the theory that these hyperthermophiles were injected into the reservoirs through: (1 ) drilling and secondary-recovery operations; and/ or (2 ) natural penetration via faults and seeps. They pointedly distance themselves from the idea, championed by T. Gold, that subterranean bacteria are actually permanent ancient residents of a deep subterranean biosphere. (Stetter, K.O ., et al; "Hyperthermophilic Archaea Are Thriving in Deep North Sea and Alaskan Oil Reservoirs," Nature, 365:743, 1993.) On the other hand, in their comments on the above paper, J. Parkes and J. Maxwell do ...
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... Science Frontiers ONLINE No. 129: MAY-JUN 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Extremophilic Terraforming of Mars If we are to colonize Mars, we must make it more earthlike; and that is what terraforming does. Right now, the Martian atmosphere, surface temperatures, level of ionizing radiation, and noxious soil are inimical to delicate, complex life forms, such as us. But these hostile Martian conditions are easily endured by some bacteria, such as Deinococcus radiodurans . This bacterium, one of the extremophiles, lives in our sewage systems and other unpleasant places. It can survive desiccation, freeze-drying, and high radiation levels. D. radiodurans can do more than survive on Mars. It can begin to detoxify the soil and prepare the way for other pioneer microorganisms. And even more: What D. radiodurans can provide is a microscopic (and therefore easily portable) factory -- a kind of terra-forming toolkit -- from which any number of products potentially can be derived. Whether it is engineered to reduce metals, produce drugs for ailing astronauts or simply manufacture the polymers necessary for the production of thread, D. radiodurans , one of the world's oldest bacteria, may provide a means of expanding the limits of human imagination beyond the written sci-fi page. (Slotnick, Rebecca Sloan; "Extremophilic Terraforming," American Scientist, 88: 124, 2000.) Comment. Perhaps D. radiodurans is the oldest bacterium on earth. Having arrived eons ago on ...
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... Science Frontiers ONLINE No. 123: May-Jun 1999 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Nanobes Get used to this term! Of course you know about microbes. Well, nanobes are also life forms but so much smaller than microbes that they deserve the prefix "nano" (for 10-9 ) rather than "micro" (for 10-6 ). The smallest recognized bacteria, Myco plasma , lack cell walls and fall in the size range 150-200 nanometers. Nanobes are much smaller: 20-150 nanometers. But are nanobes really alive? A drill core recently extracted from a stratum of sandstone 3 kilometers deep off the coast of Western Australia was found to be infected with miniscule filamentous structures. P. Uwins and her colleagues at the University of Queensland believe these structures (" nanobes") are alive. They appear to grow and have cell walls. But skeptics assert that some lifeless chemical structures also grow. Others suspect contamination of the sample as it was raised to the surface and handled. Published photos of the nanobes look very much like the structures in the Martian meteorite ALH84001, which are claimed to be fossilized extraterrestrial bacteria. (SF#116) (Dayton, Leigh; "Tiny Wonders," New Scientist, p. 13, March 27, 1999.) Comment. R.L . Folk claims that so-called "nannobacteria" (100-400 nanometers) are ubiquitous on the earth. Few biologists believe that life forms can be this small, and ...
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... Science Frontiers ONLINE No. 130: JUL-AUG 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Biogenic Magnetite in ALH84001 Many scientists were justifiably skeptical about those tiny, worm-like shapes seen in Martian meteorite ALH84001. Said to be fossilized bacteria, the objects seemed much too small to be viable. Some experts suggested they were just abiotic crystal-line growths. K.L . Thomas-Keprta, who led the NASA team studying ALH84001, snorted that her group was not so stupid that it would mistake crystals for fossils. ( SF#116 ) Thomas-Keprta et al have now come forward with more evidence that ALH-84001 does indeed contain biogenic material. Those worm-like forms have iron-rich rims containing fine-grained crystals of magnetite, some of which possess a unique morphology and which are essentially identical to the magnetite crystals secreted by magnetotactic bacteria on earth. Their conclusion: In ALH84001, the presence of these elongated prismatic magnetite crystals embedded within the carbonate glo- bules, which clearly formed on Mars, represents strong evidence for life on early Mars. (Thomas-Keprta, Kathie L., et al; "Biogenic Magnetite within Martian Meteorite ALH84001," Eos, 80:F69, 1999.) From Science Frontiers #130, JUL-AUG 2000 . 2000 William R. Corliss Other Sites of Interest SIS . Catastrophism, archaeoastronomy, ancient history, mythology and astronomy. Lobster . The journal of intelligence and political conspiracy (CIA, FBI, JFK, MI5, NSA, ...
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... Science Frontiers ONLINE No. 32: Mar-Apr 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects An Even Larger Ocean Of Life Fred Hoyle has written another book, The Intelligent Universe; A New View of Creation and Evolution. The subject matter is irresistible and, to make things more interesting, New Scientist has published a scathing review of it, castigating Hoyle for his doubts about evolution and terming his approach "dispicable." (My! How conventional people hate unconventional people!) In this new book, Hoyle goes far beyond his previous thesis, which in essence declared that from statistical considerations life could not have arisen and evolved on earth. Rather, life had to come from outer space, probably in the form of bacteria and viruses. Evolution was and is dependent upon new information arriving from outer space on tiny bits of life. Hoyle now greatly extends his theory: "But where did a knowledge of amino acid chains of enzymes come from? To use a geological analogy, the knowledge came from the cosmological equivalent of a previous era, from a previously existing creature if you like, a creature that was not carbon-based, one that was permitted by an environment that existed long ago. So information is handed on in a Universe where the lower symmetries of physics -- and characteristics of particles and atoms -- are slowly changing, forcing the manner of storage of the information to change also in such a way as to match the physics. It is this process that is responsible for our present ...
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... Science Frontiers ONLINE No. 88: Jul-Aug 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Early Life Surprisingly Diverse The three life forms sketched below are tiny microorganisms, not the worms they appear to be. They are thought to be bacteria, for they closely resemble modern cyanobacteria. What is most important about these fossilized micro-organisms is that they were found in the Apex chert of Western Australia. The Apex chert is designated Early Archean and assigned an age of 3.465 billion years [Four significant figures!]. It is rare to find any fossils at all in rocks this old, but apparently the Apex chert escaped most of the fossil-destroying metamorphism afflicting most Precambrian formations. Even more remarkable is the diversity of these suspected bacteria. J.W . Schopf reports finding no less than eleven different kinds so far--and our planet was only a few hundred million years old at the time the Apex chert was formed. Schopf's discoveries generate at least three questions: How could life have originated and diversified to such an extent in just a few hundred millions years? Why after such rapid diversification did these microorganisms remain essentially unchanged for the next 3.465 billion years? Such stasis, common in biology, is puzzling. If these microorganisms are really cyanobacteria, they would have released oxygen to the atmosphere. Is the standard assumption that the earth's atmosphere lacked oxygen until 2.2 billion years ago correct? (Schopf, J. William; "Microfossils of the Early ...
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... Science Frontiers ONLINE No. 134: MAR-APR 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Speaking of ALH 84001 Among the various magnetic grains comprising ALH 84001 are some nanometersized, hexagonal prisms that are "indistinguishable" from those excreted by terrestrial magnetotactic bacteria: Just when scientists in general were convinced that ALH 84001's "worms" had a mineralogical (i .e ., non-biological) origin, along comes this revelation. The ALH-84001 controversy is not over yet. (Kerr, Richard A.; "Tiny Magnets Point to Martian Life," Science, 290:2242, 2000.) Comment. In terrestrial magnetotactic bacteria, these magnetic crystals are strung together to make a sort of compass needle that helps orient the organism in muck and other lightless and lowly habitats.) From Science Frontiers #134, MAR-APR 2001 . 2001 William R. Corliss Other Sites of Interest SIS . Catastrophism, archaeoastronomy, ancient history, mythology and astronomy. Lobster . The journal of intelligence and political conspiracy (CIA, FBI, JFK, MI5, NSA, etc) Homeworking.com . Free resource for people thinking about working at home. ABC dating and personals . For people looking for relationships. Place your ad free. ...
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... Science Frontiers ONLINE No. 23: Sep-Oct 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Short-circuiting heredity Genes, those carriers of heredity, have turned out to be great gadabouts. Not only do they jump about within a species, but also between species, especially the simple prokaryotic organisms, such as bacteria. It is now well accepted that genes flow between different species of bacteria in physical contact, thus stirring the evolutionary pot. Until recently, scientists believed that the higher organisms, the eukaryotic species, including you and me, did not indulge in such "horizontal" traffic between species. But a few cases have now been found, one involving humans and a microorganism associated with tumors. And the search is just beginning, as biologists look for something they never thought of looking for before. (Lewin, Roger; "Can Genes Jump between Eukaryotic Species?" Science, 217:42, 1982.) Comment. This apparent short-circuiting of classical heredity channels supports the radical notion that evolutionary blueprints may be transmitted between divergent species. In the long view, may-be we should not malign viruses, germs, and biting insects! From Science Frontiers #23, SEP-OCT 1982 . 1982-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 65: Sep-Oct 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Microorganisms At Great Depths It was a surprise when diverse biological communities were discovered around deep-sea thermal vents, where sunlight is nonexistent and the energy for sustaining life must be extracted from the mineral-charged water gushing from the vents. An analogous situation occurs at great depths in the earth's crust itself, as proven by sampling at three deep boreholes in South Carolina. Number of microorganism colony types at various depths at Site P28. The concentration and diversity of microorganisms (mostly bacteria) at depths as great as 520 meters (1610 feet) below the ground's surface are remarkably high. It makes one wonder what will be found even farther down. To illustrate, more than 3000 different microorganisms have been found in the boreholes. Many of the bacteria are new to science. As the following two paragraphs demonstrate, subterranean life consists of many well-adapted microorganisms working together. "The traditional scientific concept of an abiological terrestrial subsurface is not valid. The reported investigation has demonstrated that the terrestrial deep subsurface is a habitat of great biological diversity and activity that does not decrease significantly with increasing depth. "The enormous diversity of the microbiological communities in deep terrestrial sediments is most striking. The organisms vary widely in structure and function, and they are capable of transforming a variety of organic and inorganic compounds. Regardless of the depth sampled, the microorganisms were able to perform the cycling of carbon, nitrogen, sulfur ...
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... Science Frontiers ONLINE No. 108: Nov-Dec 1996 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Glow Below Is there such a thing as sunless photosynthesis? Did photosynthesis evolve at the earth's surface or deep in the oceans near hydrothermal vents? Such questions are engendered by the strength of the mysterious glow that emanates from these deep-sea vents. It is at these cracks in the ocean floor that very hot, mineralladen water gushes forth, and where colonies of bizarre tube worms, blind shrimp, and hyperthermophilic (high temperature-loving) bacteria thrive. (For details, see SF#60 or p. 238 in Science Frontiers, the book) The first anomaly is the strength of the glow itself. It is not all thermal radiation emitted by the 350 C water spewing forth from the vents; in fact, it is 19 times more intense than expected from theory. Something else is contributing energy, but no one knows what it is so far. The unexpected intensity of the vent glows also asks some provocative questions of the biologists: Is the glow strong enough to sup port photosynthesis? Quite likely, seems to be the answer. Are life forms in the vicinity of the vents employing photosynthesis? We don't know yet, but some bacteria do photosynthesize. Might not life and perhaps photo synthesis, too, have originated at the vents rather than on the planet's surface? This is an attractive possi bility, because very early in the earth's history the surface was ...
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... Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Rubberneckia The long-standing belief that unlimited rotary motion is impossible in animals has been shattered. It was, after all, a very reasonable assumption, because necks and other appendages turn only so far before bones and muscles begin to snap. Well, it seems that inside ter-mite guts there resides a single-celled animal with a head that rotates constant-ly 30 times a minute. Since none of its membranes shear during rotation, we must infer that membranes are basically fluid structures rather than solids as supposed. The animal, called Rubberneckia, has a shaft running the full length of its body plus a motor of undetermined character. To make Rubberneckia even more bizarre, thousands of tiny, rod-like bacteria occupy long grooves on the cell's surface. Like galley slaves, the bacteria row with their flagella to keep Rubberneckia moving -- a curious symbiotic relationship. (Cooke, Robert; "A Tale to Make Your Head Spin,: Boston Globe, March 20, 1984, p. 1. Cr. P. Gunkel) From Science Frontiers #33, MAY-JUN 1984 . 1984-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 67: Jan-Feb 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects We Live Atop A Chemical Retort Far down there beneath our feet, the earth's chemicals are bubbling away, aided often by bacteria and other life forms. It's a dark world, but it's also hot, permeated by fluids, and possibly the abode of organisms we haven't dreamed of. Three hints of this nether world follow. Quick oil. Rather than ripening in deep strata for millions of years, as per prevailing theory, some oil is being created in only a few thousand years in the vicinities of ocean-bottom chimneys. Dimesized oil globules have been sighted floating near these chimneys. Analysis of chunks broken off the chimneys by research submersibles reveal the presence of petroleum-like hydrocarbons that are less than 5000 years old. It is thought that high-temperature fluids percolating up through the sediments convert buried organic matter into oil very rapidly. (Monastersky, R.; "The Quick Recipe for a Soup of Black Gold," Science News, 136:295, 1989.) Comment. Not mentioned in this article is T. Gold's theory that oil is actually derived from primordial carbon deep in the crust. Gassy water. Some water wells in Texas also produce much methane. This methane is apparently not related to any oil or gas wells in the region. Rather, surmise has it that bacteria deep in the crust are converting buried organic material into methane and ...
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... Science Frontiers ONLINE No. 75: May-Jun 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Can organisms direct their evolution?" In 1988. Harvard molecular biologist John Cairns committed an act of scientific heresy. He proposed in a Nature article that bacteria living in an unfavorable environment are able to choose which mutations to produce to adapt to the stressful situation. Cairns made his directed-mutation hypothesis in response to an unusual finding -- data that strongly hinted bacterial mutations might occur more often when beneficial." The above quotation is the lead paragraph in a long BioScience article that details the consternation Cairns' results have created in the biological community. The problem that biology-as-a -discipline has is that it has deified a paradigm: neo-Darwinism. Now, neo-Darwinism is supported by many experiments showing that some mutations are indeed random. Consequently, as M. Gillis re-marks in her BioScience article, the biological community 'got locked into its belief that an organism cannot control its own mutation.' Furthermore, Cairns' claims recall the long battle with Lamarckism, a subject that biology has closed-the-book-on. In a nutshell, Lamarckism has been interred since the 1950s, and 'Nobody wants to give the appearance of straying from the neoDarwinism fold.' Gillis goes on to review some recent experiments supporting those of Cairns. But, impressive though these may be, there have been neo-Darwinian explanations for some of the results. Even so, more and ...
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... Science Frontiers ONLINE No. 107: Sep-Oct 1996 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Rock-Based Life Virtually all biology textbooks insist that all terrestrial life ultimately depends upon sunlight for its survival. The ecosystems clustered around the deep-sea vents and the bacteria found in deep aquifers demonstrate that the sun is not essential to life -- chemical energy does just fine. In fact, the domain of chemosynthetic life has now been extended to a Romanian cave that has apparently been almost completely sealed off from surface influences for 5.5 million years. Air does leak in through tiny cracks, and water partially fills the cave. What is most remarkable in this sunless, sealed ecosystem is its biodiversity: 48 animal species, including 33 brand-new species. The roster includes isopods, a millipede, a centipede, a water scorpion, and a leech. Of course, bacteria and fungi thrive there, too. In contrast to unsealed caves, where insects, bats, and other sources of food filter in from the surface, life in the Romanian cave seems to derive entirely from hydrogen sulfide present in the cave's rocks. This compound is consumed by microorganisms, which are then grazed by cave occupants higher up the food chain. A NASA scientist has called Movile cave a "Mars analog site." And indeed it might be, for Mars has plenty of rocks and subsurface water. (Skinrud, E.; "Romanian Cave Contains Novel Ecosystem," Science News, 149: 405, ...
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... Science Frontiers ONLINE No. 41: Sep-Oct 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Genetic Garrulousness It is tempting to predict that those cells with the most genetic material will belong to the most advanced organisms. One would, for example, expect to find more DNA or nucleotide pairs in human cells than the cells of bacteria or plants. In the case of the bacteria, this expectation is realized. Some plants, however, have one hundred times more DNA per cell than humans. Some fish and salamanders do, too. One reason why there is no simple relationship between a cell's genetic complement and the organism's complexity is that a lot of genetic material is apparently useless, with no known functions. Human genes, by way of illustration, possess about 300,000 copies of a short sequence called Alu. The Alu sequences seem to be simply dead weight -- functionless -- yet continuously reproduced along with useful sequences. One purposeless mouse gene sequence is repeated a million times in each cell. (Stebbins, G. Ledyard, and Ayala, Francisco J.; "The Evolution of Darwinism," Scientific American, 253:72, July 1985.) Comment. Why so much redundance? Or is there some purpose for this excess genetic material that we haven't yet descried? The "useless" sequences may merely be left over from ancient gene shufflings; or they may be awaiting future calls to action. The above tidbits come from a long review article that is ...
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... Science Frontiers ONLINE No. 48: Nov-Dec 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Oil, oil: everywhere, every age Geologists have discovered a major deposit of oil in Precambrian rocks in Australia's Northern Territory. Precambrian oil does exist elsewhere -- around the Great Lakes, Russia, etc. -- but the Australian deposits differ in that they are economically attractive. The oilbearing strata are dated at between 1.4 and 1.7 billion years; and the oil itself is at least this old. Significantly, the oil contains extremely small amounts of steranes, which are thought to be derived from advanced organisms, but there were plenty of chemicals typical of primitive bacteria. The mere existence of commercially exploitable deposits of Precambrian oil implies that, far from being devoid of life, the ancient earth was host to immense accumulations of bacteria and other simple organisms. (Anonymous; "Ancient Oil in Australia: A New Bonanza?" New Scientist, p. 26, September 11, 1936.) Comment. As discussed above this Australian oil might have been produced abiogenically. The surface and near-surface Athabasca oil sands in western Canada constitute a well-known deposit of almost unbelievable size. Geologists have long speculated about where such an immense quantity of biological matter could have originated. (Few dare to suggest nonbiological origins!) Now, we learn that below the Cretaceous Athabasca oil sands lies a 70,000 square kilometer "carbonate triangle" estimated to contain about 2 x 1011 cubic meters ...
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... Science Frontiers ONLINE No. 80: Mar-Apr 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Dinosaur Flatulence And Climate Changes "Fossilized dinosaur dung contains evidence that flatulence from the giant creatures may have helped warm the Earth's climate millions of years ago, scientists said yesterday. "The researchers detected chemical signs of bacteria and algae in known and suspected dinosaur droppings. That indicates that plant-eating dinosaurs digested their food by fermenting it, a process that gives off methane." We all know that methane is a "greenhouse gas," so it seems that the dinosaurs may have self-destructed. (Anonymous; "How Dinosaurs May Have Helped Make Earth Warmer," San Francisco Chronicle, October 23, 1991. Cr. D.H . Palmer) Comment. We are not being facetious here, for it is seriously proposed that much of the greenhouse gas produced today comes from cattle, sheep, and other animals that ferment their food. From Science Frontiers #80, MAR-APR 1992 . 1992-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 8: Fall 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Importance Of Nonsense One of the greatest surprises of modern molecular biology has been the discovery of "split genes" in higher forms of life. In the chromosomes of lowly bacteria, genes march along one behind the other, but in more complex organisms the genes are separated by segments of genetic material that apparently have nothing to do with the manufacture of protein. Because there seems no need for these inserted jumbles of genetic information, they are characterized as "nonsense." But evolutionists insist that this nonsense must have some survival value or it wouldn't be there! Present speculation is that the nonsense segments separate mini-genes that contain the blueprints for assembling well-defined parts of proteins that possess specific functions. To illustrate, the main part of the immunoglobulin molecule has four functional parts (one for interacting with cell membranes, another that functions as a hinge, and so on). Lo and behold, the immunoglobulin gene consists of four mini-genes separated by three segments of nonsense. The suspicion is that the evolution of higher life forms has been accelerated by keeping these prefabricated, functionally oriented mini-genes apart and shuffling them as integral units. The shuffling of entire functional elements rather than smaller bits and pieces of genetic information might speed up organic evolution. (Lewin, Roger; "Why Split Genes?" New Scientist, 82:452, 1979.) From Science Frontiers #8 , Fall 1979 . ...
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... Science Frontiers ONLINE No. 84: Nov-Dec 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects It Came From Within Life did, that is! Forget that warm little pond where life incubated according to all the textbooks. Instead, says T. Gold, an iconoclastic Cornell physicist, life began in rocky fissures deep down in the earth's crust. The idea is not as unlikely as it sounds. Look at the most primitive life forms we know, the archaebacteria. They like heat, need neither air nor sunlight, and prosper on sulfur compounds for sustenance. Such bacteria are today found in boreholes as deep as 500 meters, in thermal springs, and around deepsea vents. Gold surmises that these archaebacteria migrated to the surface long ago, where they evolved into higher forms of life. "Gold argues, moreover, that the earth's interior would have provided a much more hospitable environment for proto-life four billion years ago than the surface would have, ravaged as it was by asteroids and cosmic radiation. And if life emerged within the earth, then why not within other planets? 'Deep, chemically supplied life,' Gold says, 'may be very common in the universe.'" (Horgan, John; "It Came from Within," Scientific American, 267:20, September 1992.) From Science Frontiers #84, NOV-DEC 1992 . 1992-2000 William R. Corliss ...
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