Tag: "sex" at biology news
Scientists use gene therapy to improve memory and learning in animals
...all hormones are bad. Estrogen, the primary female sex
hormone, enhances memory and can therefore block the negative cognitive effects of the corticoids. "Estrogen protects memory against stress," said former Stanford postdoctoral fellow Andrea Nicholas, lead author of the study, who was recently name...
Teenagers know about condoms ... so why don't they use them?
...ms, and young men often feel pressured into having sex
when they get the opportunity, whether they have a...ld find it hard to even discuss the possibility of sex
with potential partners, which makes it difficult to plan condom use. Other common themes included...
First global analysis of sexual behavior
...s. In an age in which scare-stories about underage sex
and promiscuity abound, there has in fact been no ...eloping countries, especially those in which first sex
occurs predominantly within wedlock, the trend towards later onset of sexual activity among women ha...
Information on bird flu cases poorly recorded, scientists say
...duck," for example--and others in which the bird's sex
and age were misidentified. Likewise, reported details of the location and time of discovery of an infected bird often lack specificity, yet they are crucial for a good understanding of the virus's spread. Information about capture and sampling metho...
Michigan State researcher traces the evolution of honey bee gender
...and evolutionary history of the csd (complementary sex
determination) gene," Huang said. "The various ver...ording to Huang. His research shows this method of sex
determination first appeared in a shared ancestor of the European and three Asian honey bee species....
UC Davis scientists' groundbreaking research: Mate-attracting chemicals
... insect species, including silkworm moths, release sex
pheromones or chemical signals to attract a mate. ...John Carlson. The UC researchers then introduced a sex
pheromone receptor from the silkworm moth into the fruit fly, tested the signals, and drew a positiv...
Insights into honey bee sex gene could bring sweet success in breeding
...nd the discovery in 2003 of csd (the complementary sex
determination gene) helped fill in the blanks. The gene has many versions, or alleles. Males inherit a single copy of the gene; bees that inherit two copies, each a different version, become female. Bees that have the misfortune of inheriting two ide...
Sweet yet sophisticated: Honey bee genome lends insight into sociality, sensation and sex
...: 1352-1365. [DOI: 10.1101/gr.5094806] On sex
and death A honey bee's sex
is determined by the genotype of a single gene called csd (complementary sex
'Fruit fly dating game' provides clues to our reproductive prowess
...ally antagonistic genes, or genes that benefit one sex
while harming the other, are prevalent then "females who seek out high-fitness males will find that they produce high quality sons, but this will have detrimental effects on their daughters," says Dr. Chippindale, a Canada Research Chair in evolution...
Groups and grumps: Study identifies 'sociality' neurons
...response seen after exposure to a bird of the same sex
(a negative situation for a territorial, asocial species), the activity of vasotocin neurons increased dramatically in response to this positive scenario. In the second experiment, highly social zebra finches were placed in a mate-competition situa...
A little of what you fancy does you no good
... the contrary, having a fit parent of the opposite sex
leads to dramatically lower rates of reproductive success. Sexually antagonistic genes, it appears, may have far-reaching effects on patterns of fitness inheritance. Using a recently developed genetic tool called hemiclonal analysis, researchers c...
Women's math performance affected by theories on sex differences: UBC researchers
...mance. "Our study doesn't explore whether innate sex
differences exist," says Dar-Nimrod, a Psychology ...nts with bogus scientific explanations for alleged sex
differences in math. Some women received a genetic account of inborn traits to explain the differe...
Bad blood between boys and girls
...to suggest an effect of parasitic infection on the sex
of a baby. Kankova and colleagues analysed the ... blood, previous deliveries and abortions, and the sex
of the newborn. On average worldwide, for every 100 children born, 51 are boys. Kankovas tea...
Childcare tug-of-war influences shorebird breeding systems
... around. Mathematical modelling showed that if the sex
ratio was reversed, so that there were more female...have much to discover about how and why population sex
ratios are maintained and regulated by nature. "We also need to grasp better how breeding systems ...
Other highlights in the Oct. 4 Journal of the National Cancer Institute
...ausal Breast Cancer High levels of circulating sex
hormones, including estrogens and androgens, may be associated with breast cancer risk for premenopausal women. Heather Eliassen, Sc.D., of Brigham and Women's Hospital in Boston, and colleagues collected blood samples from 18,521 premenopausal wome...
Resistance to chemotherapy in lung cancer, optimizing flu vaccination strategies
...es of generally marginalized populations," such as sex
workers and drug users. "Attention to these challenges, rather than the mythical generalised developmental challenges, is urgently required." Another myth, say Godwin and colleagues, is that most of the most of the progress made in controlling the ...
Thermal imaging shatters arousal gender gap myth
...gles for military operations. Previously, sex
researchers have measured arousal with instruments that require genital contact and manipulation. Binik focused thermographic cameras on his subjects' genitals while they watched a montage of material from pornography to horror movies to The Best of ...
Embryo tests give parents the choice
...inics in the US are allowing couples to choose the sex
of their child, asurvey conducted by the Genetics ...nter in Washington DC. "PGD clinics are performing sex
selection just to satisfy parental preferences, and embryo screening is being used for late-onset di...
Crickets on Hawaiian Island develop silent wings in response to parasitic attack
...er 20 minutes, the researchers noted the position, sex
and wing structure of all crickets inside the circle, and measured the distance from all crickets to the speaker. Comparing their observations made on the three islands, the researchers found that on Kauai, the flatwings arrived much more quickly, ...
China's environmental challenges
...ight herons, and carp--all of which have exhibited sex
organ malformations. Frontier's Finishing Lines columnist Katherine Ellison highlights Goldman Environmental Prize Award winner Yu Xiaogang, a Chinese watershed activist. She notes that the Chinese government realizes it must rely on the support of...
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