Sexual vs. asexual reproduction: scientists find sex wins
...ou get eight offspring, but with two males and two females you get only four offspring. In other words, the asexual population grows twice as fast as the sexually reproducing one. The second part of the mathematical advantage is that the asexual adult female is able to put all of her genes into the next ge...Men and women drinking equal amounts of alcohol have unequal risks for liver damage
...h long-term heavy use of alcohol, the inability of females to induce protective mechanisms will place females at higher risk of liver damage when both genders drink equal amounts of alcohol....Differences in response to amphetamines found between males and females pre-puberty
...findings reveal that differences between males and females in response to drugs begins at an earlier stage th...motive ability; males displayed no changes. PCPA females displayed significant increases in startle behavior at 14 days; males had no significant changes. ......hat cross-sectional study concluded that males and females develop anatomical brain regions for known functional tasks on different time schedules. Since these changes appear in many brain regions around age seven and 11 years, the authors assumed that boys and girls each have specific functional goals that......vironment for a longer time period than comparable females in the study. Accordingly, hormone manipulation i... to four days of age, male rats were castrated and females were injected with testosterone. All animals were inoculated with the Seoul virus as adults; antibo...... IN THE STUDY, volunteers must be healthy males or females between the ages of 18 and 50 who currently are HIV-negative and at low risk for acquiring HIV infection. Individuals who are pregnant or nursing, or who have hepatitis C or hepatitis B infection are not eligible for the study. Study participants wi......differences, noting that conclusions about pay for females in the highest-ranking jobs are based on a relatively small number of respondents. Two-thirds of all married or previously married female life scientists (67 percent) report that their spouse's or partner's career has limited their career "at least ...Tips from the Journals of the American Society for Microbiology: October 2001
...infection. Using rat models, they discovered that females who have had their ovaries removed were more likely to develop endotoxic shock. More importantly, estrogen replacement therapy significantly decreased mortality in male rats."These results demonstrate that estrogen is providing protection against V....APS August/September journal hot picks
... elite athletes, differences among black and white females exercisers, and effective techniques for teaching science are among the current research highlights published by the American Physiological Society (APS) September 10, 2001 - Bethesda, MD-The American Physiological Society (APS) spotlights recent res...Mothers transmit DNA through daughters only
... mitochondrial DNA is entirely transmitted through females one would have to follow its inheritance for hundr...other genetic material that is transmitted through females only. If the pattern of inheritance is identical, this evidence stable maternal inheritance of the m...Fire ant queens and workers negotiate truce' on colony sex ratio
...hine. They were puzzled, though, that the ratio of females to males in some ant colonies was not quite as hig...perm to fertilize the eggs. Fertilized eggs become females with diploid, or paired, chromosomes; unfertilized eggs become males with haploid, or single, chromo...Fatal thrombotic disease in designer mice lacking vascular thrombomodulin
...ease is one of uncontrolled thrombosis. Males and females show different rates of disease progression in this strain, but the basis of this effect and the possible relation with the coincidence of disease and sexual maturity remain mysterious.......nmarchicus is directly related to the abundance of females in the population. "We found that a tenfold increase in adult egg-producing female copepods will not result in a similar increase in the number of surviving eggs," said Ohman, a professor in the Integrative Oceanography Division at Scripps. "Rather...New great white shark study has conservation implications
...te sharks roam Earths oceans much more widely than females has implications for future conservation strategie...t while males disperse widely across ocean basins, females tend to stay in a particular region, perhaps returning to their birth site to reproduce. Great white...Unleashing GMO's into the environment
... which they sexually mature and the number of eggs females produce. Then they developed a computer model base..., but they reached sexual maturity earlier and the females laid more eggs. Attempting to predict how these effects balance out would be extremely difficult, bu...Biting may drive division of labor among social wasp workers
... observed their interactions. O'Donnell focused on females because this species of wasp is basically a female society and males seem to do little work. The range of biting behaviors observed varied, ranging from mild to highly aggressive. O'Donnell divided the behavior into three categories: very mild th...Nile crocodiles threatened by alien weed
...the population. "We found a three-to-one ratio of females to males in our sample of the adult population," s...d Leslie. "We are not sure what happens to nesting females that abandon overgrown nest sites. They possibly 'dump' their eggs in the water or continue looking ...Somatostatin in sexually dimorphic gene expression
...in livers of females. Surprisingly, the males and females in this mutant strain maintain their sexually dimorphic sizes and growth rates, suggesting that not all genes that are regulated by pulsatile GH release are equally sensitive to the continued presence of the hormone during the interpulse portion of t...Scientists record extraordinary sounds made by minke whales
...ly as a vocal display produced by males to attract females and tell other males to stay away. The songs of humpback whales are thought to serve this purpose, but much more research is needed to find out if the minke whales use their vocalizations in a similar way, he said.......e is more complicated. We initially found that the females did not respond to the treatment." The researchers are exploring several options for adjusting the treatment for females. "There may be reasons specifically related to how testosterone influences enzyme activity in mice that would explain why there ...