Tag: "assumption" at biology news

Effort to control trade in great white sharks gets teeth from international community

...ggressive and dangerous of all shark species. This assumption was elevated to the public level by Steven Spielberg's 1975 film "Jaws," based on Peter Benchley's best-selling book and widely recognized as the film industry's first summer blockbuster. Since then, field studies on the species have revealed that th...

Reports says Uganda's forests worth $350 million/year

...the environment. There was good evidence that this assumption does not hold in Uganda," said Plumptre....

Delays in cutting greenhouse gasses could harm environment

...or Applied Systems Analysis in Austria. A dominant assumption in climate change research has been that there is an economic advantage to delaying action to curb greenhouse gas emissions, said Oppenheimer. One benefit to waiting is that new clean-energy technologies are likely to have been developed, so they cou...

Study in Royal Society journal on possible genetic factors in social responsiblity

...h as patterns of migration and growth. A critical assumption is that the sequences evolve in a neutral fashion, unaffected by natural selection. Here, mitochondrial DNA sequences from tits of the genus Parus were tested for signatures of natural selection. Although there appears to be some selection on these ...

DFG establishes three new clinical research units

...investigating a new model. They are working on the assumption that the body's energy balance is centrally regulated by the brain, and that it is not the serum glucose concentration which governs the metabolism. Brain glucose regulation is critical for higher organisms since a lack of glucose (neuroglycopenia) ...

Global bird populations face dramatic decline in coming decades, study predicts

...ios for the future. The best case was based on the assumption that conservation measures in the next 100 years would be sufficient to prevent additional bird species from becoming threatened with extinction. For the worst case, the researchers assumed that the number of threatened species will increase by about...

Higher blood pressures among African Americans - genes not likely to be an explanation

...e populations of European descent. This led to the assumption that individuals of African origin have a genetic predisposition to hypertension. However, this assumption was based solely on data collected in the US and had never been confirmed by international studies o...

A bug's life: aging and death in E. coli

Can organisms such as bacteria age? The assumption has been that cells that divide symmetrically do not age and are functionally immortal. In a study published in the premier open-access journal PLoS Biology Eric Stewart and colleagues have now overturned this idea by analyzing repeated cycles of r...

Family trees of ancient bacteria reveal evolutionary moves

...reams is counterintuitive. "Most people have the assumption that Cyanobacteria came out of a marine environment after all, they are still important to marine environments today, so they must always have been," Blank said. "When Cyanobacteria started to appear, there was no ozone shield, so UV light would ha...

Assumptions of effects of rising carbon dioxide probed

... question numerous times, but none have tested the assumption that a single-abrupt increase in CO2 concentrations will produce changes similar to gradual increases over several decades. A paper in the Feb. 10 issue of the journal Nature titled Abrupt Rise in Atmospheric CO2 Overestimates Community Response in ...

Study links Ebola outbreaks to animal carcasses

...eaks." The paper provides definitive proof for the assumption that Ebola moves from wildlife populations to humans through the consumption or handling of carcasses or bushmeat. Specifically, the researchers found that Ebola infections in wild animals such as gorillas, chimpanzees, and occasionally duikers (a d...

New findings lead researchers to question basic assumptions of fisheries management

...sh produce huge numbers of eggs and larvae, so the assumption has been that the spawners that remain after harvesting will produce plenty of larvae to replenish the population. According to Berkeley, however, elimination of older generations drastically reduces the ability of the population to replenish itself....

Radio-tracking associated with 'dramatic shift' in water vole sex ratio

...io of the animals' offspring, casting doubt on the assumption that radio-tracking does not fundamentally affect ...associations. Our findings are a reminder that the assumption that the use of radio-collars does not fundamentally affect the biology of the subjects always requi...

Researchers investigate 'whole farm' approach to reduce dairy pollution

... Station forage research physiologist. "If you add assumption on top of supposition, you wind up with legislation and litigation based on very little data," said Muir, who is also a member of the research project. And Central Texas dairies are caught in between the legislation and suits, he said. Muir, Lambert...

Understanding biological foundation of human behavior critical to improving laws

... this imbalance, Jones believes, is a false public assumption that acknowledging biological causes of behavior somehow denigrates human free will or minimizes the importance of social and cultural conditions. "It may follow from demonstrably false dichotomies, such as 'nature versus nurture,' taking misleading ...

UF science discovery raises questions about origin of African mammals

...s work is very important because it challenges the assumption by some molecular evolutionists that the history of the Earth can be determined solely by studying modern mammals. "Bloch's team has brought in additional evidence and made a very coherent challenge to the paradigm of molecular studies that you can r...

Researchers call for expanding the repertoire in studying birdsong

... on when they learned their song repertoires. The assumption has been that most species, with a few exceptions, learned their songs early in life. More recent research, Beecher and Brenowitz said, has shown that there is a continuum of learning, with some species acquiring a fixed repertoire early in life, ot...

US-India research team completes analysis of X chromosome

... a certain way," says Pandey. "So our only initial assumption was that if a genetic region is important and codes for a protein, the sequence will be conserved at the protein level. Thus, even if the genetic sequence is different here and there, the protein sequence could still be the same." Essentially, the re...

U. of Colorado study shows early Earth atmosphere hydrogen-rich, favorable to life

...g to the study. "There seems to have been a blind assumption for years that atmospheric hydrogen was escaping from Earth three or four billion years ago as efficiently as it is today," said Pavlov. "We show the escape was limited considerably back then by low temperatures in the upper atmosphere and the suppl...

Migration study finds that sweeping management changes are needed to protect Atlantic bluefin tuna

...ing between the two populations challenges a basic assumption long held by the International Commission for the Conservation of Atlantic Tunas (ICCAT), which has managed Atlantic bluefin since 1969. According to ICCAT, the two populations rarely mix--a finding that led the commission to establish separate quota...

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