Tag: "female" at biology news
UCSD medical researchers discover molecular pathway that turns a juvenile heart into an adult heart
... researchers also found differences in male versus female
mice. The male animals experienced greater disease and died earlier than the females with mutated ASF/SF2. The UCSD study was funded by the National Institutes of Health (NIH). Additional authors were Xiangdong Xu, B.S., UCSD Department of Cellula...
Found: Missing sequence of the human Y chromosome
...sent in all 100 individuals tested, but not in any female
controls, confirming that this sequence was a fundamental part of the Y chromosome. More surprising, however, was Rappold's finding that this "missing" sequence was not unique to the Y chromosome. Rather, this sequence exhibited between 95-99% homol...
Big, old fish key to restoring groundfish stocks
...coast from 1996 to 1999, the average age of mature female
black rockfish declined from 9.5 to 6.5 years in a fish species that has a maximum lifespan of about 50 years. Soon after, many fisheries were in serious decline. Genetic studies by OSU researcher Michael Banks and his graduate students have also s...
Study in Royal Society journal on managing GM crops for environmental benefit
...95, Germany Evolution of juvenile growth rates in female
guppies (Poecilia reticulata): predator regime or ...O Box 1050, OSLO, N-0316, Norway Sperm influences female
hibernation success, survival and fitness in the bumble-bee Bombus terrestris by Dr B Baer and Profe...
New research shows in the animal world, it pays to be an imposter
...anlon the cuttlefish can switch between a male and female
appearance 10 to 15 times per minute. "In the blin... time. The results, they say, are surprising since female
cuttlefish of this species reject most mating attempts by any type of male 70 percent of the time. "...
Protein adiponectin appears protective against heart disease
..., higher levels of adiponectin were observed among female
participants in comparison to their male counterparts," said Dr. Costacou, explaining that adiponectin levels in blood samples from women averaged 20.8 micrograms per milliliter, versus 16.5 micrograms per milliliter for men. "This is a significant d...
Evolution of classical polyandry: three steps to female emancipation
... to Emancipation Classical polyandry occurs when a female
breeds with several males who will raise their offspring alone. New research suggests that three evolutionary steps are crucial for this type of mating system with reversed sex roles to develop. Firstly, males take on care of the eggs (the reasons w...
Why attractive (but costly) males get the girls
...measuring both the costs and benefits of mating to female
crickets and their offspring and provide new evide...tness consequences of the various unions. Although female
crickets, they found, paid a higher survival price for mating with attractive males, these females p...
Researchers find local environment directly influences adult stem cell reservoirs
...stem cell biology." The reproductive system of the female
fruit fly, as in humans, contains a reservoir of adult stem cells. When the stem cells divide, they create two daughter cells, each with a distinct fate. One daughter travels away from the reservoir, divides further, and eventually becomes the egg an...
Quantum dots research leads to new knowledge about protein binding in plants
...chanism of interaction between the pollen tube and female
tissue during reproduction. "Integrating materials science, chemistry and plant biology to understand how and where specific proteins act on a pollen tube is one more step towards a better understanding of the fundamental processes involved, namely ...
Monkeys pay per view
... information. Male monkeys "paid" in juice to view female
hindquarters or high-ranking monkeys' faces, but required "overpayment" to view low-ranking monkeys' faces. Despite living in a captive colony, the value monkeys placed on information about potential sexual partners and powerful individuals matched t...
Glow-in-the-dark zebrafish at UH hold keys to biological clocks
...of spawn, with hundreds of eggs being laid by each female
per week. This gives the scientists a better chance of identifying mutant fish whose biological clocks run fast or slow, providing the ability to trace the specific genes that create the anomaly. Putting UH a bit ahead of other institutions engaged...
A gene's fist 'kiss' sets off that affair known as puberty
...physical changes and emotional baggage of male and female
puberty, respectively. "We now have very good evidence that the GPR54 gene and its switch, the kisspeptin protein molecule produced by KiSS-1, are key to the initiation of puberty, when GnRH is released," Dr. Plant said. "However, it's unlikely that...
US government list of cancer-causing agents grows
...are nasal tumors in rats and benign lung tumors in female
mice. MeIQ, MeIQx, and PhIP are heterocyclic amine compounds formed when meats and eggs are cooked or grilled at high temperatures. These compounds are also found in cigarette smoke. They are listed in the report as "reasonably anticipated to be huma...
Beer-drinking rats count calories better than many people, UF researchers say
...ood, fluid and alcohol intake of six male and five female
rats over several days in three separate experimen...alcohol mixed into a sweet gelatin. Both male and female
rats cut back on their calories from food and maintained a consistent intake of overall calories dur...
Scientists find male finches frugal in their attempts to attract females
...rtility ends, the scientists could infer when each female
had been at the peak of her fertility during the e...rprise, we discovered that males somehow ascertain female
fertility and sing the most when trying to attract the most fertile females," Sockman said. "Thus, m...
Cricket's finicky mating behavior boosts biodiversity
...oing to be." In down-to-earth terms: "What turns a female
cricket on? Why does she prefer one pulse rate over another? Whatever the reason, it's very important that she exercise this preference in order to keep the species distinct." Mendelson spent three and one-half years studying the Laupala cricket with...
Sexual cooperation: Mating increases longevity in ant queens
...nimal species. Males often try to manipulate their female
mates during copulation--for example, by traumatic...eficial to males because, for example, they reduce female
re-mating probability or boost their fecundity directly after mating, but they can be very harmful t...
First love ruins him for all others
...to males appears to be that wing feeding keeps the female
occupied during the time it takes the male to transfer the sperm."...
A startling diary reveals the onset of autism
... are now 12 years old. Rutherford reports that the female
twin is doing well, and read an early draft of Rutherford's research manuscript. The male twin "continues to struggle with language development, but is usually a happy child." The twins' mother has started a nation-wide organization that funds autism...
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