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Tag: "fertility" at biology news

New egg freezing technique offers hope to hundreds of women

...undreds of women who want to preserve their future fertility but who, for whatever reason, only have eggs, not ...help to eliminate the existing time differences in fertility between men and women, whereby women's supplies of eggs decline at a faster rate than men's supplies...

Injection may prevent infertility in men receiving cancer chemotherapy

... the testes of cancer patients against the loss of fertility caused by chemotherapy, a scientist told the 22nd ...y drug. "The effects of chemotherapy treatment on fertility are an important issue for long-term survivors of cancer who may not have started or completed a fam...

The vicious cycle of rainforest destruction

...rainfall are savanna. Other issues such as soils, fertility and drainage must play a part, the researchers believe. They will make measurements in Africa, Australia and South America, focusing on 'zones of tension' where rainforest and savanna currently grow side by side. Using these measurements, detailed c...

It's all in the genes

...te of cottonwood leaves, which in turn affects the fertility of soils, which affects the microbes in the soil, which affect the insects that live in the soil or eat the leaves, which affect the birds that feed on the insects, and so on. In the July issue of Nature Reviews Genetics and the May issue of Evoluti...

The first baby boom

...ople who could be fed, but also boosted individual fertility in women to a possibly unique extent on such a scale in human history," write the authors. ...

Component in soy products causes reproductive problems in laboratory mice

...cycles, problems with ovulation, and problems with fertility as they reached adulthood. The new study looks at the direct effects of genistein on the ovaries during early development. "We knew genistein was linked to reproductive problems later in life, but we wanted to find out when the damage occurs," said ...

New brain hormone puts brakes on reproduction

...p the body's hormones within the optimal range for fertility and successful mating. The head of the axis is the brain's GnRH-producing hypothalamus, which communicates via a blood portal with the anterior pituitary and stimulates production of the hormones gonadotropin, luteinizing hormone and follicle stimula...

Ethiopian development raises birth rate

...iverted towards reproduction, resulting in greater fertility and reduced mortality. However, since food and other resources are already scarce, this comes at the cost of an increase in childhood malnutrition. Dr Gibson said: "This study is, to our knowledge, the first to demonstrate a link between a technol...

Fertility drugs given 'all-clear' in new study

...ntaneously with that in children conceived through fertility treatments using letrozole. This is an apples-and-oranges comparison, because there are always fewer birth defects in children conceived spontaneously." The earlier study also compared different age groups between the control and treatment. The new ...

Testes to incubate stem cells

...ure human spermatogenic stem cells to restore male fertility after cancer therapy," says Hannu Sariola, from the University of Helsinki in Finland who is also working towards a similar goal. Bizarrely, a brain cell growth factor also has a powerful influence on spermatogonial stem cells. Glial cell derived n...

A surprising pair of proteins help make healthy eggs

...ncer. "Thousands of women in this country undergo fertility treatments each year and some have no idea why the...e a transcription factor called TAF4b plays in the fertility of female mice. Without this protein, egg-producing ovarian follicles didn't develop properly. The r...

Male rivalry increases when females at most fertile, say researchers

...r male physical appearance vary according to their fertility status. During ovulation women tend to find masculine looking men more attractive and prefer their voices and odour. During this fertile phase women are more likely to have an affair with a masculine-looking man, as their features are linked to hig...

World faces challenge as life expectancies lengthen, scientist says

... be good news for many European countries with low fertility rates. "Countries like Sweden and Italy have been having this huge debate for many years over population decline," Tuljapurkar explained. "A lot of the debate is about immigration: People have been telling them they need to increase immigration in or...

GPSDB, the free Gene and Protein Synonyms DataBase

...ers prevent agricultural runoff, promote sustained fertility and reduce input costs. ...

Amazonian terra preta can transform poor soil into fertile

...ers prevent agricultural runoff, promote sustained fertility and reduce input costs. ...

Hormonal male contraception reversible after few months for all men

...permatogenesis recovered to levels compatible with fertility in all men. Dr Liu and colleagues comment: "Our data provide strong assurance that the previously described efficacy of hormonal male contraceptives is coupled with highly predictable recovery to semen characteristics that are compatible with fertil...

New male contraceptive clears hurdle

... the sperm as they swim by. In study animals, male fertility returns if the RISUG is flushed out with another injection that dissolves the gel. Elaine Lissner, director of the nonprofit Male Contraception Information Project in San Francisco, says she is not surprised that American men are watching the RISUG ...

UK sperm donor crisis

A study by a leading UK fertility centre has found that the numbers of men ?especial... of the study, particularly in the early days when fertility issues were less well known to the public. The unit is also reviewing its high cut-off rate for se...

Center releases new public survey on stem cells

...ryos used are those remaining at the conclusion of fertility treatments that would otherwise be discarded or kept in frozen storage; a ban on the use of Federal funds to create new stem cells using these embryos currently is in effect, and various pieces of legislation pending in Congress would either extend t...

Chernobyl: The true scale of the accident

...onsequence, no evidence or likelihood of decreased fertility among the affected population has been found, nor ...erritories, no evidence or likelihood of decreased fertility has been seen among males or females. Also, because the doses were so low, there was no evidence of ...

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