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Tag: "reproductive" at biology news

A gene's first 'kiss' sets off that affair known as puberty

...se when boys and girls are primed for their sexual reproductive years as men and women, appears to be triggered by...ty to begin? How is it that the full repertoire of reproductive hormones can exist at birth, go into hiding at about four to six months of age, then reemerge in ful...

Ants Genetic Engineering Leads To Species Interdependency

...ival.Female ants are generally found in two forms: reproductive queens andsterile workers. The role, or caste, of an individual is determined forlife at a certain stage in her development.In virtually all ant species, it is the environment in which a femaleis raised, rather than a genetic predisposition, that det...

Researchers trace evolution to relatively simple genetic changes

...For example, "sticklebacks vary in size and color, reproductive behavior, in skeletal morphology, in jaws and teeth, in the ability to tolerate salt and different temperatures at different latitudes," he said. Kingsley, Schluter and their co-workers picked one trait -- the fish's armor plating -- on which to foc...

Octopuses occasionally stroll around on two arms, UC Berkeley biologists report

...For example, "sticklebacks vary in size and color, reproductive behavior, in skeletal morphology, in jaws and teeth, in the ability to tolerate salt and different temperatures at different latitudes," he said. Kingsley, Schluter and their co-workers picked one trait -- the fish's armor plating -- on which to foc...

Sexual cooperation: Mating increases longevity in ant queens

...ct is a powerful driving force in the evolution of reproductive biology for many animal species. Males often try t...very harmful to females, whose lifespan and future reproductive output can be drastically reduced. New findings suggest that in some social insects--in which both s...

How the environment could be damaging men's reproductive health

...hat environmental factors could be affecting men's reproductive health. The studies, published online today (Thursday 28 April) in Europe's leading reproductive medicine journal Human Reproduction, suggest that environmental pollutants could be changing the rat...

Gray wolves maintain the food chain in winter

... on individual species, with disruptions in range, reproductive success, and seasonal phenomena like migration. But, in a new study from the open-access online journal PLoS Biology (www.plosbiology.org), Christopher Wilmers and Wayne Getz show that the impact of climate change on many different species in Yellows...

Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive

... important influence on social behaviors that have reproductive and genetic consequences." Diverse emotions occur, but reward response primary "It's a stark reminder that the mind truly is in the brain," noted Lucy L. Brown of the Albert Einstein College of Medicine. "We humans are built to experience magical f...

Harmful chemicals may reprogram gene response to estrogen

...rs of women who used DES are at increased risk for reproductive tract abnormalities, pregnancy complications such as ectopic pregnancies and preterm deliveries, infertility, and a rare vaginal and cervical cancer called clear-cell adenocarcinoma. Other research conducted by NIEHS scientists indicates that women e...

Same-Sex Mating Discovered in a Toxic Fungus

... involving both mating types. "Yet, how can sexual reproductive potential be maintained in an organism with a largely unisexual population structure?" Heitman asked. "The fruiting of alpha strains provided a clue." In their laboratory experiments, the researchers found that, rather than being an asexual process,...

Technique may allow cancer patients to freeze eggs, preserving fertility before starting treatment

...nd radiation therapy can cause damage to a woman's reproductive system and leave her unable to have children afterward. Some women may regain their reproductive function after their treatment ends and may be able to conceive on their own, while others will beco...

Scientists journey to southern Africa to unravel the secret world of elephant communication

...at could play a crucial role in their survival and reproductive success. "Perhaps they're sending out signals to p...ilderness is further complicated by the elephant's reproductive biology. Females breed when they are in estrus--a brief period of ovulation that only occurs every t...

UN votes to ban human cloning

...and India, have not reached a consensus on banning reproductive cloning and want to keep their options open on the... had been missed to adopt a convention prohibiting reproductive cloning because of the intransigence of those who failed to recognize that other sovereign States mi...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...males. This difference is related to the fact that reproductive success in females is linked to the ability to produce numerous large eggs, hence the need for the female to be of a certain size herself. "Small males, however, can sometimes fertilize many eggs by sneaking rather than by fighting," Quinn says in t...

Report that delayed motherhood decreases life expectancy of mouse offspring

... be a controversial topic of discussion, a team of reproductive biologists headed by Juan TarĂ­n at the Department ...ight of their offspring. Several other aspects of reproductive fitness of offspring were assessed, but none showed significant deleterious effects. This report id...

Of mice and men's (and women's) contraceptives

... as brain, heart, liver, and so forth, only in the reproductive cells we want to target." Investigating germ cell molecules for contraception is also desirable because it frequently allows reversibility. Hecht and colleagues have been proposing this scheme for the last several years, but how does the absence of ...

Symbiotic bacteria protect hunting wasps from fungal infestation

...eat to higher organisms, and because of their high reproductive potential and adaptability, they are extremely difficult to control. Ironically, the best counteragents against microbes are often other microbes that produce very potent antibiotics. Thus, an effective and elegant way to counter the threat caused by...

Scientists generate patient-specific stem cells, Science study says

...development would result if the cells were used in reproductive cloning. Any attempts at reproductive cloning would be dangerous and should not be attempted under any conditions. W.S. Hwang, B.C. Lee, ...

SuperLigands - a database of ligand structures derived from the Protein Data Bank

...development would result if the cells were used in reproductive cloning. Any attempts at reproductive cloning would be dangerous and should not be attempted under any conditions. W.S. Hwang, B.C. Lee, ...

Research shows smoking adds a decade to reproductive age of IVF patients

...t of ten years to a 20-year-old subfertile woman's reproductive age and has a "devastating" impact on a couples' c...ished today (Thursday 7 April) in Europe's leading reproductive medicine journal Human Reproduction[1]. Lead researcher Dr Bea Lintsen, from Radboud University Nij...

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