11 results found.
... Science Frontiers ONLINE No. 14: Winter 1981 Supplement Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Worms with inside-out stomachs The recently discovered tube worms, living near the hot water vents on the ocean bottom off the Galapagos, have no mouths or guts. Their bodies are covered with thousands of feathery tentacles, each packed with blood vessels. Apparently, the tube worms extract nutrients directly from the sea water and expel wastes the same way -- having in effect external stomachs. These worms, which may be many feet long, contain enzymes that permit them to extract carbon dioxide from the seawater and fix it much like plants do during photosynthesis. George Somero, at Scripps, estimates that the enzyme levels in the worms are similar to those in a spinach leaf. (Anonymous; "15-Foot Sea Worm Has Plant Qualities," San Diego Evening Tribune, May 22, 1980. UPI dispatch) Comment. This curious biological anomaly developed in an ecological niche where the primary energy source for sustaining life is geothermal rather than solar. How did this remarkable situation arise? Do the tube worms have relatives in the fossil record showing a step-by-step development of inside-out stomachs? From Science Frontiers #14, Winter 1981 . 1981-2000 William R. Corliss ...
Terms matched: 1 - Score: 25 - 15 May 2017 - URL: /sf014/sf014p08.htm
... a seething retort of energy, gases, dust, and, most significantly, organic molecules and microbes. The space between the stars is more important than the stars themselves, for this thin soup is, in their view, the real "swamp" where life originated! The main evidence supporting their radical hypothesis consists of spectrograms, particularly in the infrared, which are difficult to account for on an inorganic basis, but which are fitted nicely by some organic materials, especially microbes. Hole and Wickramasinghe devote most of the present article to making a spectroscopic case for their theory, but near the end they shake the Temple of Science a bit: "Precious little in the way of biochemical evolution could have happened on the earth. It is easy to show that the two thousand or so enzymes that span the whole of life could not have evolved on the Earth. If one counts the number of trial assemblies of amino acids that are needed to give rise to the enzymes, the probability of their discovery by random shufflings turns out to be less than 1 in 1040000." They conclude that the genes that control the development of terrestrial life must have evolved on a cosmic scale, where there has been more time and much more room for shufflings. (Hoyle, Fred, and Wickramasinghe, Chandra; "Where Microbes Boldly Went," New Scientist, 91:412, 1981.) Comment. Could not the "new" bacteria that appeared in the Mt. St. Helens area, as described in LIFE'S ORIGIN WITHIN THE EARTH? , have drifted down ...
Terms matched: 1 - Score: 24 - 15 May 2017 - URL: /sf018/sf018p07.htm
... 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 existence, and it is the one which our descendants would be fated to continue." To continue his search for the ultimate, Hoyle recognizes that, contrary to what transpires in the inorganic world, life ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf032/sf032p07.htm
... Science Frontiers ONLINE No. 70: Jul-Aug 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Artificial molecule shows 'sign of life'A synthetic molecule has been found that apparently replicates itself. This seems to be a step on the road to artificial life. "Julius Rebek, Tjama Tjivikua and Pablo Ballester of the Massachusetts Institute of Technology say that their compound, an amino adenosine triacid ester (AATE), acts as a "template" which combines molecular fragments to make a copy of the original compound. This process is very similar to that used by DNA. The difference is that the biological copying usually needs an enzyme to make it work." (Emsley, John; "Artificial Molecule Shows 'Sign of Life,'" New Scientist, p. 38, April 28, 1990.) Comment. No one can say that replication is a "spontaneous" property of inorganic matter. It is truly remarkable that base matter is intrinsically self-organizing and replicating. We know! It is all because the universe just happens to be anthropic. From Science Frontiers #70, JUL-AUG 1990 . 1990-2000 William R. Corliss ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf070/sf070b10.htm
... Science Frontiers ONLINE No. 47: Sep-Oct 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Earth's womb Three recent items indicate that scientists are now recognizing how the earth's crust is tailor-made for biochemical reactions of great variety and complexity. First, E.G . Nisbet explains how subsurface hydrothermal systems are ideal places to make biochemical products, particularly in the light of the discovery that RNA molecules can extrude introns and then behave like enzymes. "The most likely site for the inorgan ic construction or an RNA chain, which would have occurred in the Archaean, is in a hydrothermal system. Only in such a setting would the necessary basic components (CH4 , NH3 , and phosphates) be freely available. Suitable pH (fluctuating around 8) and temperatures around 40 C are characteristic of hydrothermal systems on land. Furthermore, altered lavas in the zeolite metamorphic facies, which are rich in zeolites, clays and heavy metal sulphides, would provide catalytic surfaces, pores and molecular sieves in which RNA molecules could be assembled and contained. If the RNA could then replicate with the aid of ribozymes and without proteins, the chance of creating life becomes not impossible but merely wildly unlikely." The article concludes with a statement that self-replicating molecules synthesized in hydrothermal systems would be pre-adapted to "life" in the open ocean if they "learned" to surround themselves with bags of lipids. (Bag of lipids = a membrane.) (Nisbet, E.G .; " ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf047/sf047p11.htm
... 71: Sep-Oct 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The bombardier beetle pulse-jet Creationists have long pointed to the bombardier beetle's jet-like defensive spray mechanism as a device that could not have evolved in many small steps. It must be complete and perfect to work at all. New high-speed photos and related research demonstrate that: "The ejection system of the beetle shows basic similarity to the pulse jet propulsion mechanism of the German V-1 'buzz' bomb of World War II." What the beetle has "evolved" is an intermittent explosive process that fires about 500 pulses per second. The explosive energy comes from the mixing of two separate fluids (hydroquinones and hydrogen peroxide with oxidative enzymes). (Dean, Jeffrey, et al; "Defensive Spray of the Bombardier Beetle: A Biological Pulse Jet," Science, 248:1219, 1990.) Comment. The fundamental question is, of course, how can many, small, random mutations contribute to the development of the mechanisms of the pulse jet, its two fuels, the pumps, the fuel reservoirs, the control system, etc., when only the complete, perfected system has survival value. Although creationists argue that the theories of evolution and natural section are unconvincing here; it is still possible that atheistic factors still beyond our ken are operating, and that what we really need is a better theory of evolution. From Science Frontiers #71, SEP-OCT 1990 . 1990-2000 William ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf071/sf071b99.htm
... 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 The Music Of The Genes "S . Ohno has cracked a new genetic code. The 58-year-old geneticist doesn't have the whole thing worked out yet, but when he sets the genes to music -- or music to genes -- some strange and wonderful things occur. To wit: "The SARC oncogene, a malignant gene first discovered in chickens, causes cancer in humans as well. When Ohno translated the gene into music, it sounded very much like Chopin's Funeral March. "An enzyme called phosphoglycerate kinase, which breaks down glucose, or sugar, in the body revealed itself to Ohno as a lullaby." Seeing this item is from a newspaper, it was nearly consigned to the wastebasket. But wait a moment, Susumo Ohno is a Distinguished Scientist at the Beckman Research Institute of the City of Hope National Medical Center, Duarte, CA. Could there be something to it? Reading further; we find that Ohno believes that the structure of music seems to parallel that of the genes. He translates genes into music by assigning notes according to molecular weights. His ultimate goal is the discovery of some basic pattern (melody?) that governs all life. (Anonymous; "Scientist Tunes in to Gene Compositions," San Jose Mercury News, p. E1, May 13, 1986. Cr. P. Bartindale.) Comment. Not too long ago the ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf046/sf046p08.htm
... other trees when antelope browse on their leaves, according to a zoologist from Pretoria University. Wouter Van Hoven says that acacias nibbled by antelope produce leaf tannin in quantities lethal to the brows ers, and emit ethylene into the air which can travel up to 50 yards. The ethylene warns other trees of impending danger, which then step up their own production of leaf tannin within just five to ten minutes." (Hughes, Sylvia; "Antelope Activate the Acacia's Alarm System," New Scientist, p. 19, September 29, 1990.) Free-ranging antelope can always find unwarned acacias with low levels of tannin to browse on, but on some South African game ranges, they are forced to consume high tannin leaves. Too much tannin inactivates the antelopes' liver enzymes, and they die in about two weeks. Hundreds may perish in a very dry season. (Vincent, Catherine; "Les Arbres Communiquent entre Eux," Le Monde , p. 11, September 14, 1990. Cr. C. Mauge) From Science Frontiers #73, JAN-FEB 1991 . 1991-2000 William R. Corliss ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf073/sf073b05.htm
... and atmosphere, including the frequency and size of bolide impacts, have strongly implicated submarine hydrothermal vent systems as the likely habitat for the earliest organisms and ecosystems, while stimulating considerable discussion, hypotheses and experiments related to chemical and biochemical evolution. Some of the key questions regarding the origins of life at submarine hydrothermal vent environments are focussed on the effects of temperature on synthesis and stability of organic compounds and the characteristics of the earliest organisms on earth. There is strong molecular and physiological evidence from present-day mircoorganisms that the earliest organisms on earth were capable of growing at high temperatures (about 90 C) and under conditions found in volcanic environments. These 'Archaea', the living ancestors of all life forms, display a variety of strategies for growth and survival at high temperatures, including thermostable enzymes active at temperatures about 140 C. Further molecular and biochemical characterization of the presently cultured thermophiles, as well as future work with the many species, particularly from subsurface crustal environments, not yet isolated in culture, may help resolve some of the important questions regarding the nature of the first organisms that evolved on earth." (Baross, J.A .; "Hyperthermophilic Archaea: Implications for the Origin and Early Evolution of Life at Submarine Hydrothermal Vents," Eos, 72:59, 1991.) From Science Frontiers #80, MAR-APR 1992 . 1992-2000 William R. Corliss ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf080/sf080b09.htm
... it was Dawkins himself who first proposed the term "meme" for the cultural counterpart of the gene. A meme, in other words, is an "element" of culture that can be passed along to progeny by imitation and/or cultural pressures. In reductionist thinking, environmental challenges are met by gene mutations plus natural selection. In meme theory, the same challenges are confronted by cultural changes (meme "mutation") plus natural selection. The meme approach is holistic rather than reductionist and is appealing because it allows us some control over our destiny. There are several phenomena in which some scientists profess to see memes overpowering the genes: Generations of female infanticide have led to more male births than female births. In dairy-farming societies, 90% of the population has the enzyme lactase that allows individuals to digest cows' milk. In other societies, 80% become ill when drinking cows' milk. A variety of cultural pressures have raised the percentage of lefthanders in North America to 12% compared with just 2% a century ago. In Taiwan, where cultural pressures are quite different, only 1% of the populace is left-handed. In the end, of course, neither genes nor memes are in total control. Both genes and societies can be selfish! (Spinney, Laura; "The Unselfish Gene," New Scientist, p. 28, October 25, 1997.) Comment. Surely, genes and memes are not all there is. We propose the word "xenes" for those evolutionary influences we haven't thought of ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf115/sf115p04.htm
... ONLINE No. 117: May-June 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Terrestrial Life Is Ambidextrous But only slightly so! In SF#115, we asked whether right-handed organic molecules can be found in any terrestrial life forms. E. Clark answered as follows: "D -amino acids [right-handed amino acids] do occur fairly often in bacterial cell walls and other microbial products such as antibiotics. When I was first introduced to this fact, I was intrigued and I wondered if the presence of D-amino acids in these large molecules might indicate that there was something special about the way they were synthesized -- perhaps, for example, that they essentially assembled themselves without the need of individual synthetic enzymes at each synthetic step." (Clark, Ed; personal communication, February 28, 1998.) Comment. So, right-handed molecules are not forbidden on earth, but we are still faced with that great preponderance of left-handed molecules. What "force" is at work here, or is this just the way things are? We should not settle for the latter interpretation. From Science Frontiers #117, MAY-JUN 1998 . 1998-2000 William R. Corliss ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf117/sf117p05.htm
