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Tag: "predicts" at biology news

Study investigates 'divorce' among Galapagos seabirds

...eding bird pairs, Maness said. “This study really predicts that the probability of divorce increases with the birds’ success at breeding and raising a chick, because the effort required may tire out the male and consequently his mate may reject him.” It also shows that males of this species are probably n...

Experts predict Tamiflu could halve the pandemic influenza death toll versus no intervention

...p contain a pandemic outbreak.3 The study also predicts that if the stockpile is increased so that there is an unlimited supply of Tamiflu for treating symptomatic patients and for preventing infection in people exposed to these patients (household contacts and school/work contacts), illness attack rates ...

Climate change impacts stream life

...se to warming has also been clear." The study predicts that at the present rate the springtime abundance of macroinvertebrates in streams could decline by as much as 21 per cent for every 1 degree Celsius rise in temperature. Dr Durance added "The numbers of species in the streams we examined might a...

Parasites' impact goes beyond host to affect ecosystem

...ganism that doesn’t have a brain," says Byers, who predicts that anywhere gulls are prevalent, the C. lingua trematode would also be prevalent. A laboratory experiment confirmed Wood’s and Byers?hypothesis: snails infected with the parasite ate 40 percent less macroalgae than uninfected snails. In the fiel...

DNA-damage test could aid drug development

... standard in that one wants an assay that directly predicts toxicity in humans, not animals, and you could obtain human bone marrow that's left over from medical procedures." "If you could change the micronucleus assay to have a human cell readout, that would be pretty amazing," says Samson. Down the road,...

Genome of yellow fever/dengue fever mosquito sequenced

...tant part of this project is gene annotation which predicts numbers and locations of mosquito genes in the genome. In parallel to sequencing DNA in chromosomes, scientists have also sequenced large amounts of messenger RNAs collected from different mosquito tissues at distinct developmental stages. Matching a...

Scientists find hormone activity explains adolescent mood swings

..., the researchers used a mouse model that reliably predicts the human condition. In this rodent model, the alpha4-beta2-delta receptor normally has very low expression, but increases dramatically at the onset of puberty in the part of the brain that regulates emotion. Paradoxically, THP reduced the inhibition...

Hofmeyr skull supports the 'Out of Africa' theory

...h the genetics-based "Out of Africa" theory, which predicts that humans like those that inhabited Eurasia in the Upper Paleolithic should be found in sub-Saharan Africa around 36,000 years ago. The skull from South Africa provides the first fossil evidence in support of this prediction. ...

DNA ends: Common tool, different job

...ndblad and her colleagues developed a model, which predicts that Cdc13, Stn1 and Ten1 come together at the very end of chromosomes to form a telomere-dedicated RPA-like complex they dubbed the t-RPA complex. Graduate student and first author Hua Gao tested this model, using detailed biochemical experiments...

Gene expression test reveals ER and HER-2 status of breast tumors

...per in December showing that another genomic index predicts how an ER-positive patient will respond to hormonal therapy. A prospective clinical trial will soon open at M. D. Anderson to use these tests to recommend treatment for patients with newly diagnosed stage I-III breast cancer. In the Lancet Onc...

The influence of the menstrual cycle on the female brain

...ies. The human brain has a recompense system that predicts different types of reward (food, money, drugs?. The normal functioning of this system plays a fundamental role in many cognitive processes such as motivation and learning. This reward system, composed of dopaminergic neurons1 situated in the mesencep...

UCLA: How does your brain respond when you think about gambling or taking risks?

... Chair in Behavioral Neuroscience. "Brain activity predicts behavior." "Individual differences in brain activity correspond very closely to individual differences in participants' actual choices," said co-author Craig Fox, an associate professor of policy at the UCLA Anderson School of Management and an as...

Math model predicts cancer behavior

...n't have otherwise predicted." The current model predicts that in mild environmental conditions ?imagine a lush rainforest, Quaranta said ?many cell types co-exist and the tumor shape is round with smooth edges, characteristic of a non-invasive tumor. Under harsh environmental conditions ?imagine a desert ?...

Temperament linked to onset of cancer and early death in female rats

... first evidence that infant temperament among rats predicts the time at which these tumors appear and the age at which the females will die," said lead author Sonia Cavigelli, a former University researcher who is now Assistant Professor in Biobehavioral Health Pennsylvania State University. Jason Yee, a grad...

Sunflower speciation highlights roles for transposable elements in evolution

...Current Biology, published by Cell Press. Theory predicts that for diploid species--that is, those possessing two sets of chromosomes, like most animals and plants--the origin of new species through inter-species hybridization may be facilitated by rapid reorganization of genomes. Previous work on three ind...

Ocean temperature predicts spread of marine species

...O'Connor and her colleagues developed a model that predicts how far larvae travel at a certain temperature. The predictions appear to hold for virtually all marine animals with a larval life cycle. "We can apply this rule to animals without having to go out and measure every species," O'Connor said. "Our ...

A human taste for rarity spells disaster for endangered species

...targeted by collectors. Classical economics theory predicts that such exploitation is unlikely to extinguish a species because the cost of finding the last individuals would outweigh the benefits. But a new theoretical study in PLoS Biology shows that adding human behavior to the equation--specifically, the h...

Microcapsules like it hot and salty

...am of researchers. The theoretical model also predicts that it should be possible, by way of skilful adjustment of the conditions, to shrink initially swollen capsules and vice versa. This prediction was also confirmed in experiments. This continuous switching between the two states of quite differe...

Fat stem cells being studied as option for breast reconstruction

...d in patients for breast reconstruction, Dr. Rubin predicts surgeons will obtain the cells from the patients' own stores of abdominal fat. According to the American Cancer Society, more than 214,000 new cases of invasive breast cancer will be diagnosed by the end of 2006. For women who require mastectomy, ...

Choosy females make colourful males

...nd eventually to speciation. Evolutionary theory predicts that species can diverge if different females choose different characteristics in males. Yet females often pay attention to traits that reveal something about the quality of a male. As a result, females are likely to share the same preferences. In La...

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