Tag: "males" at biology news
A human hormone, combined with a full stomach, offers clues for understanding our food intake
...rotocol outlined below: Subjects : Eight nonobese males
and eight nonobese female volunteers in good health participated in the study. All met the following criteria: weight within 15% of the desirable weight for height; between the ages of 18 and 35, nonsmokers with no active medical problems or taking a...
Pesticide delays sexual maturation
...ne synthesis, according to results of the study of males
aged 10-19 years in a community of cashew plantations in northern Kerala, India. Although endosulfan is no longer made in the United States, an estimated 1.4-2.2 million pounds are used in the United States on crops including squash, pecans, and stra...
Skin cancer breakthrough
...archers write: "BRAF may be one explanation of why males
have an increased lifetime incidence of melanoma compared to females". Until now, the best-known risk factor for melanoma was if you had a mutated copy of the gene CDKN2A. This gene could explain about 25% of the inherited cases of melanoma, which eq...
UT Southwestern researchers learn importance of insulin family signaling in male sex determination
...ffecting 2 percent to 3 percent of full-term human males
at birth. Sex determination switches are diverse and can vary based on the presence of a Y or an X chromosome, environmental factors and social factors. Also, the structure of testes is quite similar among different species and suggests the presence ...
Genes control severity of heart failure, study finds
...for some of that difference. The researchers mated males
of one mouse strain that had genetic mutations that conferred a very reproducible and severe form of heart failure, with females of another healthy mouse strain. Some of the resulting offspring exhibited severe heart failure, while others inherited g...
Social mothers appear to be better mothers
... the demands of life in the wild. Socializing with males
may offer direct advantages, because some close male associates tend to shield females from harassment, support their offspring in conflicts with others and even protect infants from predators. "We take it for granted that women socialize, but when ...
Moderate alcohol consumption after meals can decrease levels of insulin
...tigation." Researchers examined eight non-diabetic males
between the ages of 19 and 22 years. All were required to consume pizza and a soft drink for 45 minutes, and then slowly drink three standard units of white wine (10 grams of alcohol each; 30 grams total) during a 90-minute period following their me...
Male flesh flies high-speed pursuit of females
...nell University entomologists have discovered that males
of the species ( Sarcophagidae: Neobellieria bulla...terally can lose sight of a target female. Yet the males
compensate for the momentary loss of vision and still catch up to mate. A detailed explanation of t...
Diet may improve cognition, slow aging, and help protect against cosmic radiation
...found that females were much more susceptible than males
to overeating when presented with a sweet-tasting diet. They also discovered that exercise helps males
overcome their urge to overeat such foods, but not females. "When given access to running wheels, o...
Sex a necessary evolutionary commodity, new study shows
MADISON - In a species of worm where males
seem glaringly superfluous, a new study shows that...s and developmental biology - there are two sexes, males
and hermaphrodites. The latter are capable of fertilizing themselves or of mating with males. Since ...
Sex in the soil
... The team showed that the sex ratio--percentage of males
and females--could be altered depending on the amount of food the animal senses. While the young female is still too young to display any sexual characteristics, it judges how much food will be available once it grows up. If it thinks there will be ...
Familiarity decides if wolf spider loves 'em or eats 'em
...esearchers had explored spider behavior with young males
and females collected in the field, kept in isolat...search, 81 immature females were exposed to mature males
of specific phenotypes. About 73 percent of the immature females were exposed to more than one male ...
Genetic differences in termite castes may lead to better control
...that develop into alates, or reproductively mature males
and females. The soldiers guard the colony but can't reproduce, fly or feed themselves. Workers feed the other termites, tend the larvae and young insects, and dig tunnels. The alates can fly and reproduce. "Termites have a hormone, called juvenile h...
Unfaithful songbirds increase offspring fitness
...er their options. It pays to be on the lookout for males
with 'good genes', those that are healthier or mor...e about half of all extra-pair young were sired by males
that were not breeding nearby. The Max Planck scientists found that distantly breeding males
Genetic basis for gender differences in the liver
...the less evident physiological differences between males
and females resides in the liver. Male and female livers express different subsets of genes, which affect the organ's ability to metabolize certain drugs and hormones. This in turn impacts numerous processes, such as reproduction. While the sexual di...
New study shows why hypertension affects black males disproportionately
...e areas exist among young, health African-American males
who show no evidence of hypertension and compared ...h a similar group of 29 non-African-American (NAA) males
recruited from the staff and student body of Columbia and Howard Universities. All participants were...
Findings offer further understanding about growth and development in young male gymnasts
...findings suggest that gymnastics training in young males
does not appear to have significant effects on their resting testosterone and sexual maturation if body composition is within normal range....
University of Chicago scientist wins prestigious Balzan Prize
...n influential in showing that the mutation rate in males
is higher than that in females. He has demonstrated this for higher primates including humans as well as for rodents. With the appearance of data from the Human Genome Project, Li and his colleagues have turned their attention to analysis of the deta...
Fruit fly pheromone receptor first ever discovered linked to specific sexual behavior
... have difficulty recognizing females. Although the males
initiate the courtship ritual, the flies' mating d... called Gr68a, showed up only on the forelegs that males
use in the tapping stage of courtship. Also, found the researchers, the activity of the Gr68a gene w...
Baboon fathers really do care about their kids
...se by primate standards. For example, females and males
have multiple mating partners, and they do not for...ce." The fact that paternal care the tendency for males
to care for their own offspring runs so strongly through baboons suggests that such care "may be a ...
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