... Plants Of The Apes Many biologists are convinced that apes, bears, cats, and dogs eat plants -- many of them obviously distasteful -- in order to medicate themselves for diseases and parasites. What also seems likely, according to K. Strier, of the University of Wisconsin, Madison, is that some monkeys regulate their fertility by the judicious consumption of certain plants. Going even farther, K. Glander, Duke University, suggests that howler monkeys control the sex of their offspring through their diets. Glander divides howler monkey females into three groups. In the first are the high-ranking females that predominantly produce male offspring. This 'male-offspring' strategy favors these females because the males they produce tend to become dominant adults that will pass on more of the females' genes than would female offspring, who are limited in the number of infants they can engender in comparison to the males. Similar optimization strategies, according to Glander, induce middleranking females to produce mainly female progeny, and low-ranking females to birth almost all males. These howler monkeys seem to control the sex of their offspring pharmologically by selecting certain plants to eat. These plants, in turn, control the electrical conditions in the females' reproductive tracts to either attract or repel sperm carrying the male Y-chromosomes, which are thought to carry different electrical charges than the X-carrying sperm! (Lewin, Roger; "What Monkeys Chew to Choose Their Children's Sex," New Scientist, p. 15, February 22, 1992. Also: Gibbons, Ann; ...

... Science Frontiers ONLINE No. 108: Nov-Dec 1996 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology More evidence of precolumbian contacts from asia Deflating a paradigm: brazil's pedra furada Astronomy Life forms in meteorites? Sunspots and planetary alignments Biology Those selfish genes may also be intelligent! Lake victoria's cichlid fishes: can random mutations explain them? Hair rarity The glow below Geology Earthquakes and mima mounds The motor of the world* Geophysics Heard above cayuga's waters A BLUE FLASH Unclassified An innovative computer Are we reall robots? Nominative determinism ...

... Science Frontiers ONLINE No. 50: Mar-Apr 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects How Cancers Fight Chemotherapy How do cancer cells develop resistance to lethal chemicals? The clues seem to reside in extrachromosomal DNA that carries drug-resistance-conferring genes from one cancer cell to another. Cancer cells dying from chemotherapy may, for example, cast off extrachromosomal DNA that carries information on how to combat the chemicals. Other factors may also be at work, but basically we have only suspicions. (Silberner, Joanne; "Resisting Cancer Chemotherapy," Science News, 131:12, 1987.) Comment. Insects and other organisms also acquire resistance to chemical poisons. Does extrachromosomal DNA play roles in these instances, too? Can Information coded in extrachromosomal DNA be passed from one species to another, say, via insect bites? From Science Frontiers #50, MAR-APR 1987 . 1987-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 47: Sep-Oct 1986 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Explaining the Nazca Lines Humans in the Americas 32,000 Years Ago? Astronomy Lumps, Clumps, and Jumps Clump of Antimatter 1986: "Tired Light" Revived Again Biology Something Big Down There! Brain Architecture: Beyond Genes Heretical Evolutionary Theory The Chromosome Gap How the Cheetah Lost its Stotts Earth's Womb Geology Oil & Gas From the Earth's Core Oceans From Outer Space? Continental Graveyard? Two Points of Great Impact Geophysics A True Fish Story Booming Dunes Another Luminous Aerial Bubble Psychology Magnetic Theory of Dowsing Chemistry & Physics Unpredictable Things ...

... Science Frontiers ONLINE No. 112: Jul-Aug 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects You May Become What You Eat When we scarf down a hamburger, we ingest bovine DNA. The textbooks say that this alien DNA is destroyed during digestion. Otherwise, it might "somehow" be incorporated into our own DNA, leading in time to our acquisition of some bovine characteristics! You'll recall that cannibals thought to acquire the virtues of their slain enemies by grabbing a bite or two! But this all sounds pretty farfetched, doesn't it? Maybe not. When W. Doerfler and R. Schubbert, at the University of Cologne, fed the bacterial virus M13 to a mouse, snippets of the M13's genes turned up in cells taken from the mouse's intestines, spleen, liver, and white blood cells. Most of the alien DNA was eventually rejected, but some was probably retained. In any event, alien DNA in food seems to make its way to and survive for a time in the cells of the eater. (Cohen, Philip; "Can DNA in Food Find Its Way into Cells?" New Scientist, p. 14, January 4, 1997.) Comment. We are only half-kidding when we ask if food consumption could affect the evolution of a species. After all, our cells already harbor mitochondria, which are generally admitted to have originally been free bacteria that were "consumed" by animal cells. The process even has a name: ...

... Science Frontiers ONLINE No. 69: May-Jun 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Extinction Countdown Some plants may, as described below, have environment-sensitive genes that help them adjust to external pressures. Amphibians and birds do not seem to be so pliable. The worldwide precipitous decline of amphibian populations is alarming. Her-petologists are literally seeing species disappear before their eyes. Here is a typical anecdote: "In 1974, Michael Tyler of the University of Adelaide, Australia, described a newly discovered frog species that broods its young in its stomach. The frog was once so commo 'an agile collector could have picked up 100 in a single night,' Tyler says. By 1980 it had completely disappeared from its habitat (a 100-square-kilometer area in the Conondale Ranges, 100 miles north of Brisbane). It has not been seen since." Similar stories emanate from Brazil, Japan, Mexico, Norway, and elsewhere. Many environmental causes have been proposed, but it is significant that the frogs are also disappearing from nature preserves where environmental pressures are small. D. Wake, a biologist at Berkeley, has remarked: "[ Amphibians] were here when the dinosaurs were here, and [they] survived the age of mammals. If they're checking out now, I think it is significant." In this context, Wake believes that there is a single, global, still-unidentified cause operating. (Barinaga, Marcia; "Where Have All the ...

... Science Frontiers ONLINE No. 10: Spring 1980 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Dynamic Dna Smugness over our discovery of the genetic code and some simple features of biological synthesis has recently been undermined by the recognition that the so-called nonsense segments in genes may be important after all. Now comes the realization that the DNA molecule may not be a staid, static construction. Travelling kinks and other disturbances seem to play some unknown role in biological recognition. Some biochemists have even suggested that DNA winds and unwinds or "breathes" like a living thing as it helps to manufacture biological substances. (Spencer, Michael; "Bent DNA," Nature, 281:631, 1979.) Comment. The addition of the time dimension to biological synthesis evokes thoughts of oscillating systems, frequency dependence, filters, etc. Perhaps Nature has invented something better than the silicon chip. From Science Frontiers #10, Spring 1980 . 1980-2000 William R. Corliss ...

... 100: Jul-Aug 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects When Humans Were An Endangered Species At one point during the last 400,000 years, the human population worldwide was reduced to only about 10,000 breeding men and women -- the size of a very small town. What caused this population "bottleneck"? Did a population crash engulf the entire globe. If not, who was spared? Such questions arise from a surprising observation: Human DNA is remarkably uniform everywhere humans are found. This hidden genetic uniformity is difficult to believe if one strolls through a cosmopolitan city like New York or Paris. Nevertheless, compared to the DNA of the great apes, whose mutation rates should be close to ours, human genes on the average show far fewer mutations. Human DNA from Tokyo and London is more alike than that from two lowland gorillas occupying the same forest in West Africa. Harvard anthropologist M. Ruvolo has commented: "It is a mystery that none of us can explain." The clear implication is that humans recently squeezed through a population bottleneck, during which many accumulated mutations were wiped out. In a sense, the human race began anew during the last 400,000 years. Unfortunately, DNA analysis cannot say where the very grim reaper came from. (Gibbons, Ann; "The Mystery of Humanity's Missing Mutations," Science, 267:35, 1995.) Comment. The hand that wiped the slate clean, or nearly so, might have been a meteor ...

... Science Frontiers ONLINE No. 29: Sep-Oct 1993 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology South American-polynesian Contacts At Easter Island The Ancient Horsemen Astronomy Another Quasar Enigma Sedimentary Rocks on Venus? Biology Porpoise Stun Gun Genes Aren't Everything Life Beyond 100 c Geology Nitrate Deposits Defy Rational Explanation Episode of Steep Geomagnetic Inclination Geophysics Astronomy and Earthquakes Satan's Storm Psychology Solving Problems in Your Sleep Unclassified Temptations of Numerology ...

... Even so, you are a composite creature and cannot survive without these tiny hitchhikers and symbionts. Just as in the oceans, our bodies are battlegrounds. Each day we are thrice invaded by massive new armies of bacteria present our food. Water and air, too, bring more combatants into the fray. Our resident bacteria continually fend off the invaders or accommodate them. Some are pathogenic and must be killed; others are useful in many ways, as in digestion. Who's really in charge in our bodies: the 90 trillion bacteria or the 10 trillion cells we call our own? Probably, neither! (Hamilton, Garry; "Insider Trading," New Scientist, p. 42, June 26, 1999.) Comment. We hear a lot about "selfish" genes and "selfish" DNA, and that we humans exist only to further the goals of DNA -- whatever they might be. But are not all these living bacteria and nonliving viruses also "selfish" at different levels of complexity? Humans may be at the top of the food chain, but are we really in charge? From Science Frontiers #125, SEP-OCT 1999 . 1999-2000 William R. Corliss ...

... 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 The Biological Diversity Crisis If life fills all available energy niches, life must be capable of transforming itself (or of being transformed) into a multitude of different energy transducers or energy utilizers. E.O . Wilson has outlined the diversity of terrestrial life in a recent issue of BioScience. The earth, it appears, is a veritable Gene sis Machine; and it is only one planet among a possible infinitude. So many terrestrial species have already been described that one could easily believe that biological collectors roaming the planet's wild places have just about completed their task. Some recent totals: 47,000 species of vertebrates, 440,000 plants, and 751,000 insects. But we may not even be close to grasping life's diversity on earth! We do well in counting the large mammals and birds, but most insects and microscopic forms of life have escaped description. To illustrate, in 1964, the British ecologist C.B . Williams, combining intensive local sampling and mathematical extrapolation, extimated the insect population as 3 million species. However, by 1985, this figure has been raised ten-fold to 30 million species. Why the huge jump? For the first time, entomologists had found a way to efficiently sample the canopies of tropical forests. This rich stratum between the sunlight and gloomy forest floor 100+ feet below had been largely neglected before. The slick tree trunks and the attacking ...

... Subjects The Burgess Shale Puzzle In British Columbia, a middle Cambrian (550 million years BP) formation called the Burgess Shale has miraculously preserved a vast assemblage of soft-bodied sea creatures, especially arthropods. Does this rich and unusual deposit help elucidate arthropod evolution? No, it has complicated the problem. Few of the fossil arthropods can be easily related to groups now living. The Burgess Shale arthropod population is primitive in some ways but remarkably specialized in others. Some of the fossils have body segments like those in one recognized arthropod group but display limbs resembling those of an entirely different group. (Fortey, R.A .; "The Burgess Shale: A Unique Cambrian Fauna," Nature, 293: 189, 1981.) Comment. It appears that Nature was shuffling the gene deck, or that there was rampant hybridization, or that confusing programs for evolutionary change were drifting in from the cosmos a la Hoyle and Wickramasinghe! From Science Frontiers #18, NOV-DEC 1981 . 1981-2000 William R. Corliss ...

... In this select group, 5.5 % had parents with perfect pitch, and 26% had siblings thus gifted. Among musicians lacking perfect pitch, the figures were 1.1 % and 1.3 %, respectively. (Ref. 2) An unexpected (to us, anyway) correlation of perfect pitch and synethesia (SF#68) was made by Freimer's group. Some perfect-pitchers swear they can "see" musical notes, and even "smell" and "taste" them! (Ref. 1) References Ref. 1. Day, Michael; "Keeping Perfect Pitch in the Family," New Scientist, p. 19, November 23, 1996. Ref. 2. Travis, John; "Pitching in to Find a Musical Gene," Science News, 150:316, 1996. Comment. Since perfect pitch would seem to be of little use to primitive humans in hunting and gathering, why was it selected for? Likewise, synethesia seems to have little adaptive value; in fact, it might even be detrimental if humans on the brink of survival were confused by exotic sensations. Perfect pitch and other curiosities of tone perception can be found at BHT14 in our Catalog: Humans I . To order this book, visit here . From Science Frontiers #111, MAY-JUN 1997 . 1997-2000 William R. Corliss ...

... abruptly. There was a sign that pointed to a group of trees. It said 'arbol' (square tree). From a distance, they didn't look square. I was disappointed. My husband made a closer inspection. He put a field guide against the trunk of one tree. It was totally square. "Later I found that the square trees were a member of the banyan family and grow only in this area of El Valle. Why they are square is still a mystery." (Oldfield, Rochelle; "Panama's Gold Frogs and Square Trees," International Travel News, 21:20, June 1996) Comment. There's a lot of waste at the sawmill when round trees are cut up for lumber. We should ask the gene fiddlers to produce square pines and oaks. Maybe they can even coax 2 x 4s to grow! From Science Frontiers #106, JUL-AUG 1996 . 1996-2000 William R. Corliss ...

... Are Pretty Darwin believed that many male birds are brightly colored because females prefer flashy finery and thus put evolutionary pressure on the development of these characteristics. A large-scale study by Baker and Parker indicates that Darwin erred and that the evolutionary pressure comes instead from predators avoiding brightly colored targets. Instinct tells the predators -- incorrectly in many cases -- that colorful prey taste bad or are noxious. The remarkable (possibly strange) aspect of bird coloration is the incredi ble external similarity of unrelated birds occupying similar habitats. Example, the American Eastern Meadowlark (left) closely resembles the African Yellowthroated Longclaw (right). (Krebs, John R.; "Bird Colours," Nature, 282:14, 1979.) Comment. Two questions cannot be repressed: How do the genes orchestrate this amazing convergence in response to environmental factors? Why was evolution not equally clever in equipping predators with countermeasures to see through these ruses? From Science Frontiers #10, Spring 1980 . 1980-2000 William R. Corliss ...

... a chemical soup might have existed before "life-as-we-know-it" arrived upon the scene? A science fiction writer like H.P . Lovecraft could certainly come up with an ominous entity based upon RNA alone. Be that as it may, a book is now on the market bearing the title The RNA World (R .F . Gesteland and J.F . Atkins, eds., Cold Spring Harbor Laboratory Press, 1993) Nature reviewed the book in its January 20 issue. In addition, the RNA World was discussed recently in Science. We now extract one nugget from each of these two sources. From Nature's review. Humans are more primitive than microorganisms in the sense that we still retain cumbersome introns (nonsense DNA) in our genes, while lowly microorganisms have been able to eliminate them. From Science. No one seems to have a clue about where RNA came from. C. de Duve ventured that: ". .. the emergence of RNA depended on robust chemical reactions -- it is wrong to imagine that some fantastic single accidental event supported the development of the RNA World." In connection with the generally accepted idea that the evolution of RNA must have taken hundreds of millions of years: ". .. de Duve suggested that, on the contrary, for such a complex chemical process to succeed it must have been relatively fast in order to avoid decay and loss of information." (Brenner, Sydney; "The Ancient Molecule," Nature, 367:228, 1994. O' ...

... 9A from the crystal surface, continually changing their shape and density." The remarkably dynamic nature of solid surfaces, as now revealed, has many implications. (Bovin, J. -O ., et al; "Imaging of Atomic Clouds Outside the Surfaces of Gold Crystals by Electron Microscopy," Nature, 317:47, 1985.) The problem of snowflake growth (SF#38) is probably solvable in terms of clouds of water molecules surrounding crystal nuclei with electrostatic fields guiding the symmetric deposition of molecules. Biological structures, too, are probably encompassed by clouds of atoms and molecules; viz., the crystal-like, polyhedral viruses. Does the highly ordered DNA structure also possess an aura of molecules constantly swapping places ? Such would not be inconsistent with "jumping genes" and M. Kimura's Neutral Theory of Evolution (SF#41). (WRC) From Science Frontiers #42, NOV-DEC 1985 . 1985-2000 William R. Corliss ...

... , some bad. It has been found that a human mutation designated CCR5-delta 32 confers immunity to AIDS if inherited from both parents. People carrying the CCR5-delta 32 mutation lack the receptors to which the AIDS virus must attach itself if it is to infect the person. What has all this to do with the Black Death? "Although the origin of the mutation is obscure, it appears to have suddenly become relatively common among white Europeans about 700 years ago. That increase suggests that something must have occurred about that time to greatly favor the survival of people carrying the mutation." What biological catastrophe decimated Europe 700 years ago? The Black Death. One-quarter to one-third of the Europeans succumbed between 1347 and 1350. The Black Death strongly modified the European gene pool, increasing the frequency of CCR5-delta 32. This mutation may not have had any direct effect on the plague itself. It may just be a quirk of fate that the survivors of the Black Death had a higher frequency of the CCR5-delta 32 mutation, and it is doubly quirky that the mutation confers a resistance to AIDS, which is a recent human affliction. About 10% of whites of European origin now carry the CCR5-delta 32 mutation. The incidence is only 2% in central Asia. The mutation is completely absent among East Asians, Africans, and American Indians. (Brown, David; "AIDS Resistance Might Be a Legacy of Plague Survival," Dallas Morning News, May 18, 1998. Cr. D. Phelps) Comment. ...

... -- 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 is not easy to grasp. "In short, the principle of preadaptation simply asserts that a structure can change its function radically without altering its form as much. We can bridge the limbo of intermediate stages by arguing for a retention of old functions ...

... cup of coffee and a nightcap. Chimps ignore him; humans wonder what he is. Superficially, Oscar is definitely chimp-like; but shave his head and he becomes eerily human. Although Oscar was widely exhibited in the 1970s, his fame diminished in the 1980s. But now, scientists want to count his chromosomes and find out what he really is. One suggestion is a cross between a chimpanzee and a bonobo (a "pygmy chimpanzee"). Or how about a chimp-human hybrid? There have been dark rumors of hushhush experiments in China, Italy, and the U.S . We'll let you know what the geneticists conclude -- unless there is more "hush-hush." (Holden, Constance; "' Mutant' Chimp Gets a Gene Check," Science, 274:727, 1996. Also: Anonymous; "Oo-be-doo, I Want to Be Like You," Fortean Times, no. 95, p. 15, February 1997.) From Science Frontiers #110, MAR-APR 1997 . 1997-2000 William R. Corliss ...