male 2 7

Tag: "male" at biology news

Even when faint, ovary scent draws sperm cells

...ine sperm quality or as a therapeutic procedure in male infertility," Jacobson said. The project is a collaboration between research groups led by Jacobson and IUB Distinguished Professor of Chemistry Milos V. Novotny. Their work led to the development of a "flow-through" device, a sort of liquid treadm...

Chimpanzee study reveals genome variation hotspots

...l genomic variation in DNA samples of 20 wild-born male chimpanzees. "We identified 355 copy number variants among the genomes of these 20 unrelated chimpanzees and found that the overall chimpanzee genetic diversity may be more extensive than was previously thought," Perry says. "This research not only...

Wild meerkats school their young

...f southern Africa. Each group includes a dominant male and female who produce over 80% of the pups. However, helpers (meerkats older than 90 days) and parents of both sexes aid in rearing the young. Pups (meerkats younger than 90 days of age) are initially incapable of finding their own prey and ther...

UCLA study finds same genes act differently in males and females

... 23,000 genes to measure their expression level in male and female tissue. What they found surprised the...tabolism differed by sex. The findings imply that male and female livers function the same, but work at different rates. "Our findings in the liver may ex...

Choosy females make colourful males

...dox: in different species, different traits reveal male quality. She examined two closely related species, one with blue males and the other with red males. Females prefer males of the right colour, blue or red, and within those categories they choose the most brightly coloured males. They do so for goo...

New technology addresses female fertility preservation

...rths were the result of the cultured embyros. Both male and female offspring were fertile. ...

Bone marrow may restore cells lost in vision diseases

...als by transplanting bone marrow cells from normal male mice into albino females with two different types ...he injury site and transformed into RPE indeed had male genetic characteristics. Furthermore, these cells were capable of producing pigment - a colorful ind...

Scientists describe new African monkey genus ?first in 83 years

...d only from mother to offspring and from father to male offspring. "Had we gotten these surprising results based on a single gene, we'd have been pretty skeptical," Olson says, "but each of the genes we analyzed either firmly supported the grouping of Kipunji with baboons or failed to support a close rela...

Evolutionary forces explain why women live longer than men

...fe, where most dueling is a form of entertainment, male behavior and physiology is shortening their lifesp...festyles are actually exacerbating the gap between male and female life expectancies. Male physiology, shaped by eons of sexual competition, is putting th...

OHSU study says stem cell 'fusion' occurs in tumors

...splanted bone marrow cells from female mice into a male mouse model of intestinal cancer. The donor-derive...e readily detected in the intestinal tumors of the male mice. To show that the transplanted donor cells fused with the tumor cells, the scientists detected...

Female birds boost up their eggs when hearing sexy song

..."sexy") songs and less attractive control songs of male canaries to female domesticated canaries. When the...that while larger eggs were more likely to contain male offspring in natural environments, in the experiment there was no difference in brood sex ratio betw...

Do angry men get noticed?

... neutral faces, researchers have demonstrated that male angry faces are a priority for visual processing ?particularly for male observers. The findings are reported by Mark Williams of the Massachusetts Institute of Technology a...

Fly's courtship sheds light on the formation of innate behaviors

...ion using mutations that perturb the stereotypical male courtship behavior of the fruit fly Drosophila melanogaster. The male fly, in its attempt to mate, will perform a series of complex behaviours ?including following female...

Researchers report technique for freezing and preserving genetically enhanced pig embryos

...s before fertilizing them with muscle cells from a male pig containing modified genetic material. The resulting embryos were then frozen at the blastocyst stage. Upon thawing, embryos were transferred to surrogate female swine. Embryos placed in the oviducts of two surrogates led to pregnancies that prod...

Study defines effective microbicide design for HIV/AIDS prevention

... are more than three times higher than among their male counterparts. Women are about twice as likely as men to contract HIV during vaginal intercourse, according to the federal Centers for Disease Control and Prevention. In developing countries particularly, cultural and socioeconomic inequities betwee...

Thermal imaging shatters arousal gender gap myth

...f control data. During the arousal experiment, the male and female subjects watched separate sexually explicit films procured from the Kinsey Institute and determined to be sexually arousing to specific genders. They watched the images through special video goggles to minimize distractions. As th...

Nice guys do finish first in lizards' evolutionary race

... needed to solve." Gene mapping revealed that the male blue-throats who buddied up are not even remotely related ?yet still share many genes. Somehow, McAdam said, the altruistic lizards know they're working to pass on their genes, even though their partners aren't family. The tag-team approach does effe...

Gene transfer using mutant form of good cholesterol cuts vascular plaque and inflammation

...e female mice during a bone marrow transplant from male mice. Because male DNA carries a y chromosome and female DNA does not, the gender mismatch enabled the researchers to p...

Researchers find that bumblebees' flower choice matters

.... Pollen allows the flowers, which contain both male and female reproductive organs, to produce seeds. Plants can only produce seeds from their own species' pollen. The pollen from another species deposited on a monkey flower, for example, is simply wasted. The most effective reproduction occurs thr...

Smoking changes brain chemistry

...ower still in the female smokers compared with the male smokers. Choline is significantly involved in cell membrane metabolism, which is essential for cardiac and brain function. Reduced choline levels can be a precursor to the breakdown of cell membranes. Concentration of total creatine (tCr) leve...

1 2 3 4 5 6 7 8 9 10