Researchers record first 'pheromone images' in brains of mice
... about the sexual receptiveness of females and the dominance hierarchy in males, among other things, said Katz....l and reproduction, said Katz. Male mice establish dominance hierarchies, so they need to know if another male is dominant or non-dominant. In addition, males re...A new animal study clarifies how different parts of the brain regulate sleep
...tion, the state-related alternation of hemispheric dominance between the major EEG markers of NREM sleep and REM sleep could indicate that the NREM-REM sleep cycle modulates the functional relations between hemispheres. The Study The authors of "Interhemispheric Sleep EEG Asymmetry in the Rat is Enhanced b...Estrogen linked to more efficient regulation of a woman's heartbeat
...heart disease and decrease the mortality rate, the dominance of vagal function in middle-aged women may produce a protective effect against lethal tachyarrhythmias. The study revealed 71 percent of women were postmenopausal; the mean age of menopause was 47.7, and only six percent of postmenopausal women recei...Study backs theory that accumulating mutations of 'quiet' genes foster aging
... to detect certain kinds of genetic effects called dominance variance that are predicted to increase with age only under the MA theory," Hughes said. "The power to detect these effects is critical to tests of evolutionary aging theories, because an age-related increase appears to be a unique prediction of the...Chestnuts used chemicals to dominate southern Appalachian forests
...s--and probably played a part in the species' past dominance of the southern Appalachian forest. Forest Service...t of the forest canopy," said Clinton. "Chestnut's dominance has traditionally been attributed to its rapid growth rate, resistance to rot and fire, and ability ...Research links adolescent steroid use to reduction in serotonin, altered signaling
...rcuitry to human beings and similar aggression and dominance patterns during its adolescent years, making it a natural model for neurological and behavioral experiments. During the first experiment, the researchers administered a "high dose" of anabolic steroids to adolescent hamsters over the course of a mon...Cosmic impacts implicated in both the rise and fall of dinosaurs
...ars ago, followed relatively quickly by the rising dominance of dinosaur populations of the Jurassic period," said Kent. He suggested that the effects of the impact killed off or reduced many competitive species, clearing the way for dinosaurs to adapt and flourish. "Dinosaurs went on to dominate for the next ...Mice point to genetic basis for obsessive grooming
...ooming of cage mates was normal grooming and not a dominance behavior called 'barbering,' in which mice remove the whiskers of other mice," said Capecchi. "Also, the cage mate grooming demonstrated that the knockout mice were not just grooming themselves because they had a skin disorder that caused itching." T...World land database charts a troubling course
... to provide a comprehensive picture of the growing dominance of human land use on global land-cover patterns. Data sets, he notes, could be used within global climate models and global ecosystem models to gain insight into the influence of land cover change on climate and biological and geochemical cycles. In...Wildlife variety is the spice of life, say scientists
...play a stronger role than selection effects (where dominance by species with particular traits affects ecosystem processes). In the real world this could mean that the amount of energy turned into plant life - the productivity of an ecosystem - also declines when species are missing. This new appraisal of the...Sleep in early life may play crucial role in brain development
...pid remodeling of neural circuitry known as ocular dominance plasticity. The researchers then examined the impact of sleep on the long-term effects of those changes by using brain imaging and making electrical recordings from brain cells. First, in one set of cats they took a measurement of the brain change, o...Baboon studies suggest strategies for coping with stress
.... Lastly, rank matters. Top baboons in a stable dominance hierarchy have lower stress-hormone levels than do subordinates. But throwing a new monkey in the mix sends stress hormones soaring as troop members jockey for dominance. Have you hugged your rat today? When Sapolsky is not in Africa watching ba...New group of microorganisms discovered in the open sea
...f the journal Nature on their discovery: "Archaeal dominance in the mesopelagic zone of the Pacific Ocean." The concentration of archaea in their study leads the scientists to conclude that archaea are "a large percentage of the biomass of the open ocean," says Karl. "These organisms could make up 50 percent ...Enzyme is crucial for production of plant growth hormone
...is mutant had long hypocotyls and increased apical dominance with down-curling leaves," said Chory. Apical dominance is the inhibition of lateral branching characteristically produced by auxin. "These characteristics...Transgenic fish could threaten wild populations
...hanges could negate the Trojan gene," he says. The dominance of sexual preference over Charles Darwin's classic theory of survival of the fittest isnot unknown to wildlife specialists and geneticists. Muir likes to use the example of the male bird ofparadise with its long swells of gloriously colored plumage a...Common grass infected by fungus makes life difficult for other species
... stress. Any or allof these factorsmay promote the dominance of infected fescue in mixed vegetation." The results of the study have implications for conservation as well asagriculture, he added,because loss of plant diversity is likely wherever fescue is common and highlyinfected, notjust in areas where it was...A new view of visual system development
...same column. Other neurons are grouped into"ocular dominance columns" according to whether they process informa...orins andephrins may guide the formation of ocular dominance columns. Unpublished resultsfrom subsequent experiments further support the idea, he says. It may ...K-State Researchers Study Pest Resistance Management
...isdoes not mean this borer will exhibit resistance dominance to toxin genesinserted into transgenic corn in the field. "The Bt toxins that we used are not identical to the material expressed inintact transgenic plants," Higgins said. "Because they are in a different form,it is also not possible to compare the....... "My best guess is that the function of dominance directs the food flowto the males and allows them to stay on the nest. This may increase theirlongevity, permitting males to mate over a longer part of the year," saidO'Donnell. Scientists study social insects because they are so ecologically...New Worlds Of Order, Argentine Ants Succeed By Outnumbering The Competition
...," says Holway. This may account for patterns of dominance within ant communities in general. It may also shed light on the success patterns of success of other introducedinsect species. "The strong competitive ability of the Argentine ant probably stems from acombination of its unique colony structure an...