Tag: "fertile" at biology news

Michigan State researcher traces the evolution of honey bee gender

...ngle version of the gene, it will become a normal, fertile male. Finally, if the bee has two identical csd ty... There's a big difference between the duties of a fertile male honey bee and those of a female. The males lead a life of luxury their duties include eating, ...

Ecology center awarded $21-million by National Science Foundation

...to the biosphere, the innovative center provides a fertile arena for interdisciplinary collaboration, focusing on novel questions and approaches and intensive sustained investigations into core areas of ecology. "NCEAS has become part of the intellectual infrastructure of ecology and allied disciplines," sa...

Chromosomal abnormalities in sperm higher after vasectomy reversal

...osomal abnormalities in their sperm than do normal fertile men, a scientist told the 22nd annual conference o...er than the aneuploidy and diploidy rate in normal fertile men", said Professor Sukchareon. "This raised a lot of questions, so we decided to study the rates ...

Study links high levels of nitric oxide to infertility and sperm DNA damage

...tile men were, on average, twice as high as in the fertile men," said Dr Amiri. "However, at this stage we we... concentration in their seminal plasma compared to fertile men, and that the sperm DNA damage may be caused by the NO." Dr Amiri said the infertile men may hav...

Male rivalry increases when females at most fertile, say researchers

...ve and prefer their voices and odour. During this fertile phase women are more likely to have an affair with...e men more threatening during their partner's most fertile phase. Rob Burriss and Dr Anthony Little, from the University's School of Biological Sciences, also...

Study shows drug blocks breast cancer migration to bone

...rom their initial tumours and bone is particularly fertile "soil" for travelling cancer "seed" cells. It has been estimated that 70 per cent of patients with progressive breast cancer and 84 per cent of prostate cancer patients develop bone metastases. D. Holstead Jones, a former post-doctoral fellow in Prof...

Do plant species really exist? Why, yes, scientists say

... of different animal species are more likely to be fertile than the hybrid offspring of plant species. "Not o...00 plant species they surveyed are able to produce fertile hybrids when mated with other species. By stark contrast, 61 percent of animal species surveyed are ...

Genetically engineered mosquitoes show resistance to dengue fever virus

...squitoes that survived the procedure also remained fertile and were able to reproduce, a key factor for any future strategies that may involve replacing mosquito populations with their genetically modified counterparts. The results were published this week in the early online edition of the Proceedings of th...

Active inbreeding avoidance in wild capuchin monkeys

... data. Because courtship and copulations involving fertile females are rarely observed in this species, it will require further research to determine whether it is the behavior of males, females, or both sexes that prevents inbreeding in capuchins. The findings are reported in the March 7th issue of Current ...

Amazonian terra preta can transform poor soil into fertile

...hest soil that can transform poor soil into highly fertile ground. That's not all. Scientists have a method to reproduce this soil -- known as terra preta, or Amazonian dark earths -- and say it can pull substantial amounts of carbon out of the increasing levels of carbon dioxide in the Earth's atmosphere, h...

Princeton professor foresees computer science revolution

...cate, the field of mathematics has never been more fertile with new ideas. Mathematics is original and deep, but it does not force you to think differently. If a math giant from the past - someone like Gauss were to come back to Earth, he would have a lot of catching up to do but he would find that math is ...

Sex, cleaner of genomes

...tibility of sexual structures, an insertion event, fertile eggs and sperm, and the successful unification of egg and sperm into a viable zygote. All of this adds up to a big energy investment -- energy an organism might have used for other purposes. Scientists have long been left to ponder, what is it about ...

New brain hormone puts brakes on reproduction

...strogen, and regulate ovulation, the production of fertile eggs. Estradiol and testosterone, in turn, feed back on the pituitary to shut down production of pituitary hormones, establishing feedback that keeps the body's sex hormones on an even keel. Estradiol also works higher in the brain, on the hypothalam...

Experimental evolution of yeast in the lab may illuminate early events in speciation

... of the ability of individuals to mate and produce fertile offspring; if two organisms can accomplish this feat, they belong to the same species, and if they cannot, they belong to separate species. Theoretically, a species can split into two when genetic barriers arise that keep two geographically mixed gro...

Lots of flowers and trees, not enough birds and bees

...production--to the point where species in the most fertile areas of the world are struggling for survival. "Pollinators are on the decline globally because of habitat loss and destruction, pesticide use, invasive species, and extinction of vertebrates," said Tia-Lynn Ashman, associate professor of biologica...

Getting an evolutionary handle on life after reproduction

Since many animals live beyond their fertile years, biologists have searched for evolutionary clues to this extended lifespan. What role, if any, does natural selection play in the evolution of the postreproductive lifespan? For natural selection to shape the twilight years, postreproductive f...

Chlamydia parasite lives off our fat

...embrane-bounded vacuole that provides a protected, fertile environment for the bacteria to grow and multiply. Because lipid acquisition from the host is necessary for chlamydial replication, these pathogens are essentially lipid parasites. So, to add insult to injury, Chlamydia apparently lives on our fat. ...

Tropical dry forests receive international recognition

...dry forest is being forgotten even though the most fertile soils are there," said Sanchez-Azofeifa, who hails from Costa Rica. "It's a mystery to me why, when both ecosystems are in danger one is ignored over the other." Tropical dry forests once made up 42 per cent of all forests in the tropics yet less tha...

Swedish researchers warn university students face infertility

... had a relatively realistic perception of the most fertile period in a woman's life, both women and men had o...s regard it as more risky to employ a woman in the fertile age bracket than a man. If parental benefit days were more equally divided between mothers and fathe...

Valuing biodiversity services, including its insurance against disease

...ewhere, the loss of microbes that helped keep soil fertile forces farmers to turn to fertilizers." "There is a very positive story to be told about the social benefits of investment in conservation," says Dr. Larigauderie. "Unfortunately, because these services are so difficult to value, the benefits derive...

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