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Tag: "female" at biology news

DDT-resistant insects have additional genetic advantage that helps resistance spread

... "This suggests that by becoming DDT resistant the female flies are passing on some unknown advantage to their progeny, presumably associated with the single metabolic enzyme (cytochrome P450) that they over express.'' "These results are important for the use of any drug, pesticide or antibiotic as they su...

Scientists discover genetic pathway responsible for breast cancer cell growth

...ery that will advance our understanding of how the female hormone estrogen causes growth of breast cancer cells. The research, in collaboration with scientists at the Institut de Recherches Cliniques de Montreal (IRCM) identifies 153 genes that respond to estrogen and one in particular that can be used to h...

Mosquitoes are more attracted to individuals infected with malaria

...ts, the researchers set up a chamber of uninfected female mosquitoes surrounded by tents containing the children - one already infected with transmissible malaria, one infected with the non-transmissible asexual stage of the disease, and one with no infection. A device called an olfactometer wafted the odou...

Trio of plant genes prevent 'too many mouths'

...ing other purposes, she says. The UW team of four female scientists serendipitously discovered what appears to be part of the pathway that tempers the production of stomata while studying a trio of genes that code for signaling receptors required for normal plant height. The scientists were working on a b...

Single gene is genetic switch for fly sexual behavior

A male fly's sexual courtship of a female fly is a complicated business of tapping, singing,... The gene encodes the Fruitless protein. Male and female flies carry different versions of the fruitless protein, as a result of sex-specific splicing of the...

Visceral Leishmaniasis: Successful Vaccine Trial In Dogs

...ng the intestine and then the salivary glands. The female insect feeds on mammals?blood. It can thus pass the parasite on to humans by a single bite. Once in the blood stream, L. infantum passes into particular cells of the immune system, the macrophages. These eventually burst, releasing the parasites whic...

Research suggests fitness of Florida panthers improved by limited breeding with Texas animals

...acked by radio. In 1995, separate pairs of Texas female panthers fitted with radio collars were released i...ers could raise several such social issues. While female hybrids seem to be surviving considerably better than their purebred counterparts, "hybrid males hav...

Rodent social behavior encoded in junk DNA

...ry bulb and lateral septum). They also checked out female odors and greeted strangers more readily and were more apt to form pair bonds and nurture their young. "If you think of brain circuits as locked rooms, the vasopressin receptor as a lock on the door, and vasopressin as the key that fits it, only tho...

AIDS expert says global strategy needed to combat feminization of HIV/AIDS

...ose in Latin America. The reasons for the rise in female cases differ among countries, with 97 percent of female HIV infections in the United States due to heterosexual transmission (81 percent) and intravenous dr...

Cultural norms not unique to human societies

...her chimpanzees, researchers taught a high-ranking female from each of the two experimental groups a different way, either Lift or Poke, to retrieve food from a system of tubes called Pan-pipes. Once the two females mastered the task, other chimpanzees within their groups were allowed to watch them perform ...

Looks matter to female barn swallows

Even after they have paired with a male, the female North American barn swallow still comparison-shops... not as dark as other males in the population, the female is more likely to leave him and then secretly copulate with another male, according to a Cornell Uni...

New Discovery May Help Doctors Treat Infertility

...f estrogen hormones and are present throughout the female reproductive tissues. These new data indicate that...d,?he added. The NIEHS researchers treated normal female mice and female mice that lack estrogen receptor beta with fertility drugs similar to those commonly...

Female volunteers prepare for a second 'bedrest'

...and the MEDES Institute are looking for twelve new female volunteers from the European Union. " The international aspect of the selection process is equally important in terms of the psychological factors we will be studying ," explains Peter Jost. " Future long-term missions will be manned by mixed, inter...

University of Nevada, Reno research team discovers hormone that causes malaria mosquito to urinate

...squito sucks blood from a human--and only pregnant female mosquitoes do this--it will take in twice its body weight in blood. To decrease this added weight, the mosquito urinates on its victim to release fluids. Coast discovered that introducing one of the two diuretic hormones, DH31, into the mosquito ca...

High rates of sexually transmitted infections found in young drug users

...y authors found that over half (58 percent) of the female study participants and a little more than 20 percent of male participants were infected with herpes simplex virus 2. Women were also more likely to have syphilis than men in the study ?4 percent versus less than 1 percent, respectively. "The sexual ...

Divergent life history shapes gene expression in brains of salmon

... Proceedings of the Royal Society B. They compared female salmon, male salmon that will eventually undertake the well-known journey from their river birthplaces to oceans ? and then migrate heroically back upstream one to three years later to spawn ? and males of the same age known as "sneakers" that mature...

Gifts from the sea

...ea urchin (Strongylocentrotus droebachiensis): The female sea urchin can produce as many as a half million eggs during spawning season, and fertilization and embryonic development are external and rapid. Such factors make this research organism ideal for the study of reproduction and development. Sea urchin...

Tufts researchers shine light on firefly mysteries

...ale fireflies lying in order to find romance? "If female mate choice is adaptive, we would expect that the ...n-doctoral student Christopher Cratsley found that female fireflies of one species (Photinus ignitus) are strongly attracted to males who give longer flashes ...

Decisions, decisions: Male or female?

...perm or a female's eggs. Present in both male and female embryos, germ cells are the precursors to both sperm and eggs. Unable to "decide" on their own which to become, however, germ cells must take "advice" from other cells within embryos as to which is the appropriate sex. The Johns Hopkins researchers h...

Environmental chemical cocktail may sabotage sperm

...ad shown that certain chemicals known to mimic the female sex hormone, oestrogen, could individually affect ... more likely to affect sperm when they reached the female tract where they would be preparing to fertilise eggs. "Maternal exposure to the compounds is probab...

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