Tag: "male" at biology news
Role reversal: male gets easy ride in insect courtship
...e female of the species lays all this on for their male
partner, the first time such nuptial behaviour, at...tion has generally dictated that it is usually the male
that lavishes the female with expensive gifts (usually food) and often risks life and limb to secure...
Not for women only: Osteoporosis in men
...n an effort to identify the prevalence and primary male
risk factors for the disease. Male Osteoporosis...one density test. However, until the prevalence of male
osteoporosis is better known, male
bone density screening for men 50 years of age is not currently ...
First descriptions of Indiana bat maternity roosts in the southern US
...0 and 2001, they captured and radio-tagged several male
and female Indiana bats and found two large matern...rnity sites and the surrounding habitat. "Although male
Indiana bats have been found roosting in pine snags during the summer," said Loeb, "this study descr...
Muslims embrace brave new world of IVF
...ts of infertility in Egypt and is now working on a male
infertility study in Lebanon, said that a number of Sunni Islamic fatwas, issued as early as 1980 from Egypt's famed Al-Azhar University, suggest that IVF and similar therapies are permissible so long as they do not involve any form of third-party do...
Women are more likely to suffer recurrent miscarriages if their first child is a boy
...ieves that the way women's immune systems react to male
foetuses is the explanation for his finding and th... the mother's immune system starts to react to the male
foetus. However, it is possible that the immune systems remains activated after delivery and affects...
The stinky smell of success of Ted the Titan: a tale from Chemical & Engineering News
... In so doing, they pick up pollen from the plant's male
parts, deposit it on the female parts, and thus fertilize it. Besides UC Davis a handful of botanical gardens worldwide cultivate Ted. "Mr. Stinky" resides at the Fairfield Tropical Garden in Coral Gables, Fla.; "Tiny" lives at UC Santa Barbara; and ...
New research challenges advice that men should abstain from sex before fertility treatment
...nt. "Our data challenge the role of abstinence in male
infertility treatments. What we have found is not so relevant to ICSI, where only a single sperm is injected into the egg, but for those treatments where we are trying to get the best possible sperm quality for intra-uterine insemination. "For the...
Male sex hormones cooperate with breast cancer gene to suppress tumors
...ed with breast and ovarian cancer, cooperates with male
sex hormones to enhance its ability to activate tr.... It also gives greater insight into the causes of male
breast cancer. BRCA-2 is one of two genes (the other is BRCA-1) linked to at least 10 percent of all...
Newly mapped enzyme could yield new treatments for female sexual dysfunction
...roduct causes rapid relaxation of smooth muscle in male
and female genitalia, allowing the thousands of tiny vessels there to swell with blood. Arginase can derail this reaction by sequestering arginine and breaking it down into compounds unrelated to those physiologically responsible for arousal, depri...
For ferrets, GPI means 'get pregnancy initiated'
...ans andother mammals. In ferrets, mating with the male
induces ovulation about 30 hours later. Then, triggered by the release of the heretofore-unidentified protein, the fertilized embryo implants in theuterus. Total gestation takes about 42 days. The prospect of encouraging pregnancies with GPI could b...
Cooperation between unrelated male lizards adds a new wrinkle to evolutionary theory
...sive, if they end up next to a genetically similar male
they just annihilate each other in terms of fitnes...ion for these different fitness combinations." The male
color morphs show differences not only in the way they interact with other males, but also in how th...
Researchers discover use of novel mechanism preserves Y chromosome genes
...s of bases contain functioning genes important for male
fertility. The team found that most of the sequence pairs are greater than 99.97 percent identical. The extensive use of gene conversion appears to play a role in the ability of the Y chromosome to edit out genetic mistakes and maintain the integrity...
Rumors of male chromosomes demise greatly exaggerated, study finds
...gs, involving observations in both human and chimp male
chromosomes, could explain how the Y repairs injur... of a "rotting Y" the widely held notion that the male
chromosome and its dead or dying genes will continue to rot away over the next 5 million years until...
Finished Y-chromosome sequence reveals a genomic 'crystal palace'
...hers has finished sequencing the Y chromosome, the male
sex chromosome once belittled as "the Rodney Dange...mic "crystal palace," containing genes that impact male
fertility, vast stretches of mirror-image DNA, and an assortment of functional and vestigial genes. ...
Chirping frogs keep UH scientists hopping
...evelopment in mammals if the gene is on, you form male
structures, if it is off, you form female structures."A key element to a genetic master switch is a protein called a thyroxin receptor, which determines what organs the frog develops at what time. For instance, the Mexican axolotl, an amphibian with ...
Is there an unexpected price for late night high tech excitement?
... Applied Physiology. Methodology Seven healthy male
students, with a mean age of 24.7 + 5.6 (SD) years participated. None could be considered an extreme morning type or an extreme evening type. Beginning one week before the start of the experiment, the subjects were instructed to wake up between 0800...
Sex Differences in Cardiovascular Disease
...pausal women have higher blood pressure than their male
counterparts. These findings suggest that ovarian hormones may affect blood pressure levels. Oparil talked about her work in this area and the cardiovascular effects of estrogen. Richard E. White, Ph.D. , an associate professor of pharmacology an...
New biography details adventures of 'Fritz Muller, A Naturalist in Brazil'
...only the female mimics the toxic butterfly. "The male
uses its color to attract the female," David West said, "so it may stand to lose the effects of that by mimicking other butterflies." The study of mimicry led West, associate professor emeritus of biology at Virginia Tech, from local butterflies to ...
160,000-year-old fossilized skulls from Ethiopia are oldest modern humans
...t 150,000 years ago. Other scientists studying the male
Y chromosome have reached similar conclusions. The new Herto fossils are from a population living at exactly this time. "In a sense, these genetic findings were impossible to seriously test without a good fossil record from Africa," said White. "Back...
JCI table of contents, 2 June, 2003
...ted deaths in men in industrialized countries. The male
sex hormone androgen plays a key role in the spread of cancer from the prostate to the bones and lymph nodes. Drug-mediated androgen suppression is the current leading treatment, however as tumor cells progress they become androgen-independent and th...
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