Tag: "male" at biology news
Parting genomes: UA biologists discover seeds of speciation
...n crossed to D. arizonae males. Because the hybrid male
sterility trait depends on the mother's genetic he...d to know just how deeply the polymorphism causing male
sterility had suffused Catalina Island D. mojavensis populations. In other words, do all or just som...
Male susceptibility to disease may play role in evolution of insect societies
...ent among social insects, suggesting that a higher male
susceptibility to disease has helped shape the evo...ial behavior in these creatures, suggest that this male
vulnerability has shaped certain behaviors in social insect colonies. These behaviors, they say, ar...
Researchers identify gene linked to sperm-producing stem cells in mammals
...nravel the mystery of the adult germ stem cells in male
testicles, which are capable of producing an average of 1,500 sperm during every human heartbeat or an average of 130 million sperm a day. "The average man will maintain a high level of sperm production from puberty onward, for decade after decade....
Without words, bullfrogs communicate through stutters in their croaks
...terature. Researchers recorded 2,536 calls from 32 male
bullfrogs in natural chorus and analyzed the numbe...er of stutters in each croak. It is known that the male
bullfrog's call attracts females for mating, maintains territorial boundaries with other males, and ...
Genetic barrier to self-pollination identified
...ols pistil function in self-incompatibility. "This male
component turned out to be much more elusive than ...ross-pollinated by pollen from the line serving as male
parent and planted in an adjacent row. However, this process is very labor intensive and invariably ...
Nonalcoholic beverages may impart cardiovascular benefits without the negative effects of alcohol
...%) during a three-hour period on 12 young, healthy male
volunteers (19 - 36 years of age). Blood samples were drawn for analysis before and at 1.5, 3.5 and 24 hours after the beginning of consumption. All three fluids regular beer, nonalcoholic beer, and the alcohol/water mixture reduced the expression...
Biologists uncover genetic links to broad range of human disorders resulting from cilia dysfunctions
...se whip-like cilia, result in non-motile sperm and male
infertility, and are probably the most commonly known type of cilia dysfunctions. Other widely known human cilia disorders include the pulmonary diseases caused by defective respiratory cilia, which cleanse the lungs by sweeping mucous and trapped pa...
Plant-like enzyme acts as key life cycle switch in malaria parasite
...srupted. It is also specific to development of the male
gametes only." "CDPK4 is unusual because apart fro...tes in the mosquito bloodstream differentiate into male
and female sexual forms, named micro- and macro-gametes respectively. In 1997, Imperial College rese...
Research into cetacean reproduction leads to birth of killer whales by artificial insemination
... captive marine mammals. Robeck's team studied one male
and five female killer whales to evaluate the rep...d 20 years old and weighed about 5,000 pounds. The male
was 20 years old and weighed more than 11,000 pounds. All were trained to cooperate in a variety of ...
Domesticated tree crops may be the 'future of forestry'
... industries rely on conventional breeding - mating male
and female trees with ideal growth characteristics, sowing their seeds and planting out seedlings. However, ideal parents are no guarantee that the next generation of trees will exhibit the same traits. "The problem with conventional breeding is that...
Penguins ingest mollusk shells to obtain calcium for thicker eggshells
...have thicker eggshells," she said. Both female and male
penguins typically fast for a week or more before ... mollusk shells and the findings were the same for male
and female. But during the period around egg-laying, females were far more likely to have shells in ...
Using science to restore habitat for declining species
...udies suggests that the socially dominant breeding male
can actually determine which tree will produce the most resin. Conner also studies the role of red heart fungus, which infects the heartwood of older pines, making them more attractive for excavation. Recent scientific article on the relationship bet...
Feeding cottonseed meal to female fallow deer safe at low rates
...e cottonseed to have severe detrimental effects on male
red deer and male
fallow deer. Whole cottonseed diets may diminish antler development by as much as 50 percent, lower ...
Archaeologists announce discoveries at the ancient Maya site of Waka' in northern Guatemala
..." Freidel says. "A title generally associated with male
rulers and important warriors." Recent studies have shown that this is not always the case, however, and on one of the site's monuments, a queen is mentioned in hieroglyphic inscriptions as bearing the title of "Kaloomte". The woman buried in the cha...
UNC study finds protein in male reproductive tract kills bacteria, may improve fertility
...t a protein they discovered three years ago in the male
reproductive tract is a potent anti-bacterial agent. In addition to protecting the male
against invading bacteria, the protein may aid fertilization by protecting sperm from harmful organi...
For a male sand goby, playing 'Mr. Mom' is key to female's heart
GAINESVILLE, Fla. --- What's a little male
fish's secret weapon for attracting the lady fish?...des a University of Florida scientist reports that male
sand gobies work harder at building nests and taking care of eggs when females are present the firs...
In male monkeys, too much soy has adverse effects
...rmones and Behavior, the researchers found that in male
monkeys, "long-term consumption of a diet rich in ... soy can have a negative impact on the behavior of male
rodents. Previous studies have shown no difference in aggression in females given large doses of soy...
What it Takes: Design principles to broaden participation in SET
...rt, however, this pool of talent remains about 3/4 male
and 4/5white. BEST's mission is to build a foundation for action through a two-year net assessment of best practices in pre-K-12, higher education and the workplace to increase the participation of women, African Americans, Hispanics, Native American...
Chlamydia in men now also linked to infertility new findings
...he female partners we found that antibodies in the male
partner was significantly inversely correlated to ...We suggest that Chlamydia antibody testing of both male
and female partners should be included in routine infertility work-up in order to enable a more adeq...
Inflammation, hypertension are focus of major new MCG research program
...hat can keep it elevated. Dr. Brands' is using the male
mouse's territorial instincts to look at whether i...ostdoctoral fellow working with Dr. Brands, puts a male
mouse in a cage where another male
has been for a few days, territorial instincts rev up, adrenaline...
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