6 results found.
... , D. Berliner, at the University of Utah, was studying human skin. To acquire raw material, he scraped skin cells from the insides of casts discarded by skiiers who had had broken bones. From this debris, Berliner extracted numerous chemical compounds. As far as anyone could tell, these substances were odorless, so he stored them in open flasks. However, Berliner noticed that when people were working in the lab with the flasks, they were more friendly and relaxed than normal. He could not divine the reason until some months later when he decided to cover the flasks of skin-derived substances. Curiously, the lab workers soon reverted to their usual grumpy selves! What could account for this strange behavior change? Knowing that animals often communicated with one another employing chemicals called pheromones, Berliner suspected that the flasks had been releasing odorless human pheromones. Sure enough, analysis of the skin-derived materials proved him correct. Next: A Look Up the Nose. Biologists have long realized that animal noses actually contain two sensory channels. The first is the familiar olfactory system, which humans also possess. The second channel is the vomeronasal system. In animals, each system has its own separate organs, nerves, and bumps in the brain. The function of the vomeronasal system is pheromone detection. It was widely believed that humans had long ago discarded this sensory system along evolution's trail. But a closer look at the human nose by B. Jafek and D. Moran, affiliated with the Rocky Mountain Taste and Smell Center at the University of Colorado, ...
Terms matched: 1 - Score: 90 - 15 May 2017 - URL: /sf090/sf090b06.htm
... 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 The deceitful she-males "In many diverse taxa, males of the same species often exhibit multiple mating strategies. One well-documented alternative male reproductive pattern is 'female mimicry,' whereby males assume a female-like morphology or mimic female behavior patterns. In some species males mimic both female morphology and behavior. We report here female mimicry in a reptile, the red-sided garter snake (Thamnophis sirtalis parietalis). This form of mimicry is unique in that it is expressed as a physiological feminization. Courting male red-sided garter snakes detect a female-specific pheromone and normally avoid courting other males. However, a small proportion of males release a pheromone that attracts other males, as though they were females. In the field, mating aggregations of 5-17 males were observed formed around these individual attractive males, which we have termed 'she-males.' In competitive mating trials, she-males mated with females significantly more often than did normal males, demonstrating not only reproductive competence but also a possible selective advantage to males with this female-like pheromone." In the competitive mating trials, the she-males were successful in 29 out of 42 trials. The normal males won out in only 13! The authors ask the question: Why aren't all males she-males given such an advantage? (Mason, Robert T., and Crews, David; "Female ...
Terms matched: 1 - Score: 42 - 15 May 2017 - URL: /sf041/sf041p07.htm
... Science Frontiers ONLINE No. 52: Jul-Aug 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Aggressive Mimicry Field studies have revealed that bolas spiders can mimic the odor of female moths, thus attracting for consumption the male moths. More specifically, the hunting adult female spider, Mastophora cornigera , releases volatile substances containing three moth sex pheromone compounds. (Stowe, Mark K., et al; "Chemical Mimicry: Bolas Spiders Emit Components of Moth Prey Species Sex Pheromones," Science, 236:964, 1987.) Comment. As in many other cases of mimicry, one wonders how the spider's capability developed by chance and in small steps. From Science Frontiers #52, JUL-AUG 1987 . 1987-2000 William R. Corliss ...
Terms matched: 1 - Score: 27 - 15 May 2017 - URL: /sf052/sf052b11.htm
... Correlated with Athletic Capability BHA39 Inherited Ear Pits BHA40 Supernumerary Ears and So-Called Gill-Slits BHA41 Nostril Orientation and Musculature BHA42 Differences and Similarities between Human and Primate Teeth BHA43 Racial Dental Differences BHA44 Historical Shrinkage of Human Teeth BHA45 Extra Dentitions BHA46 Human Horns BHA47 Unusual, Inherited Characteristics of Feet BHA48 Progressive Loss of the Little Toe BHA49 Webbed Hands and Feet BHA50 Alleged Primitive Character of Human Hands and Feet BHA51 Large Female Breasts and Buttocks BHA52 The Unusual Location of Human Breasts BHA53 Human Tails BHA54 Concordance of Human Embyro Growth and Evolutionary Developments BHA55 Anomalous Human Odors Babies Born with Full Sets of Teeth Presidential Stature Correlated with Competence Brown Line (Linea Nigra) on Stomachs of Pregnant Women Humans As Robots Height Correlated with Month of Birth Human Proportions and the Golden Ratio Humans Nuturing Foetuses of Their Twins Human Pheromones Correlated with Beauty Pixies and the Williams Syndrome Change of Eye Color with Age Skin Color Correlated with Weather Male Fertility Correlated with Finger Length Anomalous Sound Production The Devil's Spot and Witch Pricking BHB ANOMALOUS HUMAN BEHAVIOR BHB1 Apparently Irrational Human Behavior BHB2 Similarities in the Behaviors of Identical Twins Reared Apart BHB3 Correlation of Disturbed Human Behavior and Solar Activity BHB4 Correlation of Disturbed Human Behavior and Lunar Phase BHB5 Correlations of Disturbed Human Behavior, Stormy Weather, and Infrasound BHB6 Correlation of Human Behavior and Climate and/or Season of the Year BHB7 Unusual Behavior Induced by Rhythmic Stimuli [BHH8, PBH] BHB8 Cyclicity of Violent Collective Behavior BHB9 A Relationship between Number of Wars and Number Killed BHB10 Correlation of Economic Activity with Solar Activity BHB11 Correlation of Economic Activity with the Lunar Tidal Forces BHB12 Correlation of Economic ...
Terms matched: 1 - Score: 24 - 15 May 2017 - URL: /cat-biol.htm
... Science Frontiers ONLINE No. 93: May-Jun 1994 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why Snakes Have Forked Tongues Laymen and scientists alike have wondered for millennia why some reptiles possess forked tongues. It seems that we may now have an answer: Some variations of the forked-tongue theme among lizards and snakes. "Theory, anatomy, neural circuitry, function, and behavior now support a hypothesis of the forked tongue as a chemosensory edge-detector used to follow pheromone trails of prey and conspecifics [especially the opposite sex]. The ability to sample simultaneously two points along a chemical gradient provides the basis for the instantaneous assessment of trail location." The framer of this hypothesis, K. Schwenk, adds that the forked tongue and, obviously, the muscles and neural circuitry to use it properly, have evolved independently at least twice, possibly four times. (Schwenk, Kurt; "Why Snakes Have Forked Tongues," Science, 263:1573, 1994.) Comments . One can compare the forked tongue to binocular vision. Both require the parallel evolution of impressive infrastructures of data processing "equipment." From Science Frontiers #93, MAY-JUN 1994 . 1994-2000 William R. Corliss ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf093/sf093b09.htm
... of a million army ants is a sophisticated "super-organism." The colony carries out its legendary raids and can even keep nest temperatures constant to within a degree. An army ant colony seems en dowed with an intelligence far beyond that of any individual ant. N.R .Franks speculates thus: "It seems that intelligence, natural or artificial, is an emergent property of collective communication. Human con-sciousness itself may be an epiphenomenon of extraordinary processing power. Although experts prefer to avoid simplistic definitions of intelligence, it seems clear that all intelligence involves the rational manipulation of symbolic information. This is exactly what happens when army ants pass information from individual to individual through the 'writing' and 'reading' of symbols, often in the form of chemical messengers or trail pheromones, which act as stimuli for changing behavior patterns." During its 20-day stationary phase, an army ant colony scatters about 14 foraging raids directed 123 apart. The heavy line indicates the colony's path during the nomadic phase. In the body of his article, Franks describes two remarkable capabilities of an army ant colony: time-keeping and navigation. The outward manisfestation of time-keeping is in the precise timing of the colony's nomadic phase of 15 days (during which larvae are growing) and the 20-day stationary phase (during which pupae develop). The queen's egg-laying also conforms with this schedule. Raids into the rain forest occur in both phases. Perhaps more remarkable is the systematic orientation of the raids in the stationary ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf066/sf066b07.htm
