Tag: "female" at biology news
Intervention cuts nerve damage, boosts life span
...eurons extended life span on average 28 percent in female
flies and 11 percent in males as compared to genetically identical flies not expressing hUCP2, they report. That life span extension traced back to an increase in mitochrondrial uncoupling in the neuron-rich flies' heads, which led to a decline in RO...
Fitness correlates of song repertoire size in free-living song sparrows
...les or their offspring, their results suggest that female
song sparrows would leave more descendants in both current and subsequent generations by pairing with males with large song repertoires....
Defining male and female
...nd the one in 4,000 babies born with both male and female
traits. "The biology of gender is far more complic... do not meet the binary definition for male versus female
don't have the same benefits and aren't completely protected from discrimination." Children may be p...
The secret lives of whales
...ollutants. Some of these are endocrine disruptors female
hormone mimics that cause serious problems. The whole world is being feminized, says Payne. Paynes greatest hope is that in the next decade, the world will have taken heed, and instituted steps to reduce the entry of contaminants to the oceans....
Animal parenting, personality and pair-ups
...eness he has found that both young girls and young female
rhesus monkeys actively seek out opportunities to ...e so directly to humans. The socially subordinate female
monkeys in these groups become infertile in response to social interactions with a dominant female, ...
The recombination gender gap
...r but still display marked differences in male and female
recombination rates. Lenormand and Dutheil realize...les have lower recombination rates than males, the female
gametes can experience strong selection because the ovules compete with each other for resources ove...
An evolutionary road less traveled
...re "founded" between 500 to 1,000 years ago by one female
and one to four males from an agricultural culture. With too few hands to farm, this tiny group likely turned to hunting and gathering. Altogether, Stoneking and colleagues conclude, these findings caution against automatically assuming that contempo...
Radio-tracking associated with 'dramatic shift' in water vole sex ratio
...alysis revealed that the most likely cause for the female
decline was a shift in the sex ratio of young raised by radio-collared females. This result has implications for conservation research, especially for monitoring water vole populations." Skewed sex ratios have been reported in stressed and malnourish...
In the mating game, male wild turkeys benefit even when they don't get the girl
...o establish which male actually copulated with the female
- an activity hard to see in the brush - Krakauer ...d, tagged and obtained blood samples from male and female
turkeys, and then captured flightless young, scavenged broken egg shells from abandoned nests or lif...
Researchers find three major beetle groups coming up one testis short
... outsized claw on one side that is used to attract female
crabs and fend off male competitors. Still, the r...ctly transfer fluid from their accessory glands to female
crickets to provide nutrition to their egg cases," said Liebherr. "It may be that the male beetles a...
FSU anthropologist leads incredible journey through 'hobbit' brain
... Last October, skeletal remains of a bipedal adult female
barely 36 inches tall were unearthed by Australian...a variety of sources such as chimpanzees, an adult female
Homo erectus, a contemporary woman, an adult female
pygmy and a microcephalic -- a human with an abn...
University of Manchester pioneers study to support teenage mums' bone health
...larly beneficial to younger expectant mothers. The female
skeleton contains a greater amount of calcium than the male, believed to be necessary for the demands of pregnancy and breast-feeding. As this continues to develop until the age of about 25, the study seeks to investigate how younger mothers' calciu...
Biologist's findings on fertility and status in monkeys generate scientific, media interest
...the role social position plays in the fertility of female
marmosets were the recent subject of a presentatio...w "Leading Edge" on the links between dominance in female
marmosets and their fertility. Saltzman's findings show that subordinate females fail to ovulate, be...
Men and women: The differences are in the genes
...cientists thought. The data also suggests that the female
genome now differs from the male genome in at least four ways. First, previous studies had shown that the Y chromosome gives males several genes that are absent in the female. Second, this study shows the fact that some genes on the inactive X are ex...
Studies expand understanding of X chromosome
...tivation. This mechanism thus reduced the level of female
expression of genes on the X chromosome to the same level as that in an XY male. Initially, it was thought the process resulted in a complete inactivation, or "silencing," of all of the genes on that copy of the chromosome in a female. However, in th...
Variation in women's X chromosomes may explain differences among individuals, between sexes
...he findings also highlight key differences between female
and male genomes, according to the researchers. For one thing, women are known to consist of a mosaic of two cell types that differ in which X chromosome is inactivated. The Y chromosome also endows males with at least several dozen expressed genes ...
Mice with defective sperm offer clues to infertility in men
...ost of different environments in both the male and female
reproductive tracts," says Hunnicutt. "Yet they do this without making any new proteins. Instead, they appear to change their functions by rearranging the molecules on their surfaces. The annulus has been thought to act as a gatekeeper that separa...
Elephants imitate sounds as a form of social communication
...original sounds. Mlaika, a ten-year-old adolescent female
African elephant living in Kenya among a group of ...e African elephant who lived for 18 years with two female
Asian elephants in a Swiss zoo, was a nearly perfect mimic for the chirp-like calls of his long-time...
How important is sexual conflict?
...and the impact it has on the evolution of male and female
traits has become a rapidly developing field, in part because of disagreement over its importance. Sexual conflict can generate rapid anatagonistic coevolution between the sexes. This occurs when one sex, usually males, attempt to manipulate reproduc...
Positive air pressure chamber started with patients quickly after surgery
...itive pressure is safe. When nine healthy male and female
participants ages 20 to 55 ran upright at a speed of 5 plus kilometers an hour in the chamber, their heart rate actually decreased as the positive pressure on their lower body increased, making their steps lighter and the work of walking and running ...
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