Tag: "female" at biology news
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...
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...
Research suggests fitness of Florida panthers improved by limited breeding with Texas animals
...racked by radio. In 1995, separate pairs of Texas female
panthers fitted with radio collars were released i...hers could raise several such social issues. While female
hybrids seem to be surviving considerably better than their purebred counterparts, "hybrid males hav...
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 ...
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 cau...
Study continues the debate on the nature of bisexual men
... well as, self-reported sexual arousal to male and female
stimuli, researchers found that, in general, bisex...not have a strong genital arousal to both male and female
sexual stimuli. Instead, they had strong genital arousal to one sex or the other, but not to both. ...
A double punch for female survival
...e production of a molecule that would be fatal for female
cells; their work is reported in the current issue...eins," Hentze says. "We've known that a protein in female
flies called SXL can block the work of this machine, but we didn't know how. This study unravels how...
The right hitchhiker can save an aphid's life
...act that in the lab, aphids reproduce asexually -- female
aphids produce more female
aphids who produce more female
aphids -- which means the offspring are identical genetically, genera...
Decisions, decisions: Male or female?
...sperm 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...
In Iran, camera traps reveal rare Asiatic cheetahs
...rare Asiatic cheetahs. The pictures show an adult female
and her four youngsters resting in the shade of a ...S's Global Carnivore Program. "The fact that this female
has managed to raise four cubs to six months of age is extremely encouraging. Hopefully, this indic...
Human Y chromosome stays intact while chimp Y loses genes
...be due to the chimp's mating habits. Both male and female
chimps engage with multiple partners when they mate. This gives a strong selective pressure on those genes that produce sperm. Conversely, it puts less pressure on evolution to preserve those genes on the Y whose functions have nothing to do with rep...
Brain remembers familiar faces when choosing potential mate
...human brain holds separate images of both male and female
faces and reacts to them differently depending on ...amined whether early visual experience of male and female
faces affected later preferences. The research team asked over 200 participants to view a number of...
Breast cancer risk increased for African-Americans with mitochondrial DNA variant
...hite women. A much greater proportion of the white female
population, 80 percent, already carries the 10398A version of the NADH dehydrogenase gene than the five percent of black American women with the allele. In a pilot study conducted by Canter and his colleagues at Vanderbilt University, the mitochondr...
Prenatal exposure to marine toxin causes lasting damage
...e decreased the normal difference between male and female
rats in their ability to complete tasks of spatial memory, the researchers found. Previous research has shown that males normally outperform females on spatial discrimination learning in particular maze tests. Exposed rats of both sexes also showed ...
Formula against infertility
... of the RIKEN CDB are exploring the development of female
germ cells. Schler demonstrated how embryonic mouse cells can differentiate into egg cells in cell culture. Here lies "the potential to treat infertility in women someday." Saitou is investigating the molecular biological switches that trigger germ c...
Adolescents and young adults with alcohol-use disorders have a smaller prefrontal cortex
...es had smaller cerebellar volumes, whereas the two female
groups did not differ in cerebellar volumes. Also, prefrontal cortex volume variables significantly correlated with measures of alcohol consumption. Taken together, these findings suggest that a smaller prefrontal cortex is associated with early-on...
Study in Royal Society journal on possiblity of human organ regeneration
...es of several unrelated species have shown a clear female
preference for novel males. But how do females dis... males with their own odours during mating. When a female
encounters a former mating partner later on, she need only compare her own scent with that of the ma...
Study in Royal Society journal on first observation of giant squid in the wild
...ermany Egg-independent release of stored sperm in female
Drosophila melanogaster by Professor MC Bloch Qazi and Professor MF Wolfner Sperm stored in female
animals allow prolonged fertility after mating. Sperm must leave storage to fertilize eggs, yet litt...
Photos reveal first tool usage in wild gorillas
...February 1995. The first instance occurred when a female
gorilla nicknamed Leah by scientists attempted to ...shore and her wailing infant. Then another female
gorilla named Efi used a detached trunk to support herself with one hand while digging for herbs wit...
Looks matter to female barn swallows
...Y. -- 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...
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