Tag: "male" at biology news
Short-term exposure to estrogen cuts fish fertility
...hwest National Laboratory suggests that when adult male
fish are exposed to short-term and low concentrati...estrogen could change sex organs, causing juvenile male
fish to develop female organs. Estrogen is an active ingredient in most oral contraceptives and oft...
University of Idaho, Utah State University team first to clone equine
...from a cross between a female horse, a mare, and a male
donkey, a jack. As hybrids, mules are sterile, exc...oming intrigued by the observation that stallions, male
horses, do not develop prostate cancer. The horse's basic metabolism is "slow" compared to humans an...
Assisted reproduction provides bright future for HIV positive men
...tion. Nearly a third of the 39 couples where the male
was infected became parents with the birth of 14 children to 12 couples. None of the women became infected. Of the three assisted reproductive techniques used intrauterine insemination (IUI), IVF or ICSI (injection of the egg with a single sperm), I...
Older pilots OK to fly, study shows
...lots studied by Li and colleagues, 99 percent were male
and 69 percent were ages 45 to 49. On average, the pilots had 9,749 hours of total flight time and 287 flight hours in the six months prior to the start of the study. The majority of pilots (86 percent) did not have any health problems although 68 ...
Essential gene for male fertility found
...n heart disease has been found to be essential for male
fertility but has no impact on female fertility, r...23 issue of Science. "That this gene would control male
fertility was completely unexpected. We originally thought Fkbp6 was important for heart function bu...
Sneak copulations and the demise of the integrity of wild salmon populations
...ver, indicates that, similarly to wild salmon, the male
offspring of farm spawners may mature precociously...igher growth rates and reproductive performance of male
offspring of farm origin, will thus not only perpetuate, but speed the gene flow from farm fish into...
Gene may produce drought-resistant plants
...e that regulate water loss. This mutant also has a male
sterility problem that prevents pollen from activating the stigma, where reproduction begins. "The cloning of WAX2 is providing evidence that lipids in the cuticle may serve as signals that control how plants develop," Jenks said. "Lipids in animals ...
Male pregnancy in seahorses may affect formation of new species
... the fishs size-similar mating practice imposed by male
pregnancy, extended male
parental care and monogamy, Jones said. Seahorses choose similar-size mates to have the best chances...
Butterflies are flashers to attract mates
...Institute in Panama, had already demonstrated that male
butterflies recognize color patterns in seeking ma...ting signal. In her experiments, Sweeney presented male
butterflies of the iridescent genus Heliconius with female wings of the same species, but covered by...
New study suggests that women eating PCB contaminated fish are less likely to give birth to boys
...ay be responsible for changes in the proportion of male
births around the world. Contamination of the Gre... of the twentieth century the global proportion of male
births has been declining. Some animal studies suggest that exposure to PCBs may lower the proportio...
Highway deaths highest for males Male urban squirrels, that is
...highway mortality accounted for 100 percent of the male
squirrel mortality." Male squirrels went a daily distance of about 54 feet and covered a range of about 4.7 acres compared to females who daily went about 38 feet in a 3.4-acre range, Lopez noted. Female squirrel death was mostly attributable to pre...
Researchers discover effective method for killing prostate cancer cells
...rrelation between prolactin, a hormone produced by male
and female pituitary glands, and how it promotes growth of cells in the prostate led to this new study. Pioneering work by Dr. Nevalainen and colleagues established that prolactin serves as a local growth factor for prostate cells and that Stat5 is t...
Italian study finds traffic pollution affects male fertility
...ill prompt clinical and epidemiological studies of male
infertility in other work categories exposed to similar levels of environmental pollution. Meanwhile, given our findings, health authorities should be alert to the insidious health effects of environmental pollution."...
Study finds two-thirds of unplanned pregnancies in women using contraception
...a fifth among those using natural methods, such as male
withdrawal or avoiding intercourse on fertile days in the menstrual cycle. Thirty-five per cent of the unwanted pregnancies were among women using no contraception. Half of the unplanned pregnancies ended in abortion. The study involved 1,034 women w...
Roadsigns for rodents
... these items as portablesignposts. Ten groups of 4 male
and 4 female mice were put intospecial arenas with a nest box, food supply and bedding, andgiven 10, 5cm diameter white discs. Mice were videoed constantly for 15 days, and their movementsanalysed. Activity around the nest box tended to consist only ...
Wake Forest scientists develop colony of mice that fight off virulent cancer
... lung, stomach and intestine. But, said Cui, one male
mouse unexpectedly remained free of the cancer despite repeated injections. The Wake Forest team was able to show this was genetic and to develop a colony from that single mouse. The colony, now about 700 mice, remains exclusively at Wake Forest. Mea...
Diet study focus of TAES research in effort to help save giant panda
...g well. The female interacts more with people. The male
lies around and eats. You can imagine the kind of jokes made about that." Tolleson said studying the panda diet could lead to some new and exciting discoveries. "I think it's going to open our eyes to looking at nutrition like we've never done befo...
Fast changing gene drives species split
...Cambridge University, studied a gene called Hybrid male
rescue (Hmr) in the fruit fly Drosophila melanogas...illion years ago, female offspring are sterile and male
offspring die. Barbash and colleagues isolated and compared the Hmr genes from the different flies a...
Evidence shows the heart has stem cells able to regenerate muscle tissue lost to disease, wear
...hat soon after female hearts are transplanted into male
bodies, it's possible to find a significant number of new male
heart muscle and coronary vessel cells. But if the adult heart, as long thought, is not capable of ...
Tufts University biologists unveil more mysteries of fireflies flash
...biologists at Tufts University has translated what male
fireflies are saying to females when they flash th...t Christopher Cratsley examined the link between a male
firefly's flash the nutritional gift he is able to give to his mate. Their findings, published in t...
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