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Tag: "fertile" at biology news

Termites feed through good vibrations

.... However, in drywood termites, workers can become fertile and develop into breeders when they are isolated from their colony. Few workers developed into breeders in the experiments when they were broadcast the termite sourced signals, whereas many workers developed into breeders when artificial signals were...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...of the t haplotype plus the transgenic region were fertile and showed no transmission ratio distortion. Therefore, the scientists realized, two genes must be involved-one controlling sterility and a yet-to-be discovered gene regulating transmission ratio distortion. Dr. Planchart commented, "For more than 5...

Gifts from the sea

... the proteins associated with it. Female clams are fertile from May to July, and millions of eggs can be harvested from a single female. By inducing the clam eggs to undergo cell division at the same time, scientists can study millions of cells in the same stage of division. Clam eggs are also transparent, p...

Hybrid grass may prove to be valuable fuel source

.... "Miscanthus sacchariflorus and some of the other fertile Miscanthus species can be quite invasive," she said. At a research station near Hornum, Denmark, giant Miscanthus has been grown for 22 years in Europe's longest-running experimental field. The crop has never been invasive and rhizome spread has bee...

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 th...

Once-dreaded leprosy 'replaced' by tuberculosis, say researchers

...e crowding and poor sanitary conditions provided a fertile breeding ground for the spread of the killer disease. Today, tuberculosis, though curable, is still a major, long-term, epidemic disease, with millions of new cases reported around the world each year. ...

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...

Islands in the Genome Promote Speciation

.... While it's unclear whether the forms can produce fertile hybrid offspring in the wild, the progeny of lab matings appear to have no problems with fertility. This suggests that individuals either naturally prefer to mate with others of their own form, or that there must be environmental and/or genetic condi...

Adult stem cells aid recovery in animal model of cerebral palsy

.... While it's unclear whether the forms can produce fertile hybrid offspring in the wild, the progeny of lab matings appear to have no problems with fertility. This suggests that individuals either naturally prefer to mate with others of their own form, or that there must be environmental and/or genetic condi...

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. ...

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, ...

GPSDB, the free Gene and Protein Synonyms DataBase

...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, ...

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...

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 hypothal...

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 t...

Matrilin-3 gene discovered to prevent onset of osteoarthritis

... matrilin-3 was removed, the mice had a normal and fertile lifespan and appeared to have normal skeletal development. However, without matrilin-3, researchers noticed that during embryonic development, mice developed premature and extended hypertrophy ?the phase when cells increase in size to form bone. L...

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 ha...

New clues to how sex evolves

...ring meiosis, so even those who mate can't produce fertile offspring." The question remains whether new binding sites or new forms of zinc-finger protein lead rapid evolution in the worms. And there are other questions: in C. elegans, and also C. remanei, there are only four kinds of ZIM proteins that se...

New study is first to link romantic relationships to genes

...rimary partners increased, particularly during the fertile phase of their cycles," says Christine Garver-Apgar, author of the study. This study offers some understanding of the basis for romantic chemistry, and is the first to show that compatible genes can influence the sexual relationships of romantic ...

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