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Tag: "temperature" at biology news

Ocean temperature predicts spread of marine species

...he distance marine larvae travel varies with ocean temperature ?a key component in conservation and management of...this, we can see what large-scale changes in ocean temperature may mean for adult populations." The study appeared online the week of Dec. 25 in the Proceedings...

Far more than a meteor killed dinos

.... "This greenhouse warming is well documented. The temperature rise was rapid, over about 20,000 years, and it stayed warm for about100,000 years, then cooled back to normal well before the mass extinction." Marine species at the time suffered from the heat. Most adapted to the stress conditions by dwarfing, g...

Microcapsules like it hot and salty

...ty of microcapsules using the salt content and the temperature of the solution. In order to accomplish this, the ...roperties of the hollow spheres will change if the temperature and salt content are altered (Physical Review Letters, November 3, 2006). This opens up new possibil...

Plants' role in global warming re-examined

.... ORNL researchers also looked at the influence of temperature acclimation at both the local ecosystem and global scales. ORNL's study looked at the period from 1930 to 2100, with and without acclimation of leaf respiration. "All other things being equal, as they are in our simulations, more carbon stored in p...

A new view on Lyme disease: Rodents hold the key to annual risk

...riod. From 1991 to 2004, the researchers collected temperature and precipitation data, and estimated the abundance of acorns and animals on six plots of land. From this 13-year dataset, they developed computer models to estimate how each of the 11 variables (including multiple climate and deer indexes) contribut...

Researchers to develop ultra-miniature implantable sensors to measure blood flow

...monitor a patient's blood flow, blood pressure and temperature with tiny, implanted devices, thanks to research being conducted by a Cornell University professor and an Ithaca-area high-tech firm. This new technology is being developed by Edwin Kan, associate professor of electrical and computer engineering at...

Recent, rapid climate change is driving evolution of animal species

... limits of heat tolerance or increased the optimal temperature for growth, development and reproduction. "Small animals with short life cycles and large population sizes will probably adapt to longer growing seasons and be able to persist," said Bradshaw. "However, populations of many large animals with longer...

Corals switch skeleton material as seawater changes

...ently observed and predicted future changes in the temperature and acidity of our oceans ¬¬-- via global warming and rising atmospheric CO2 , respectively -- that will presumably have a significant impact on corals' ability to build their skeletons and construct their magnificent reefs," he said. Corals are cr...

Triple threat polymer captures and releases

...col," she said. "There is a slight depression of temperature at which the small molecule fragrance volatilizes ...terials -- they found a progression of decreasing temperature as they went with different amounts of poly(ethylene glycol) relative to hyperbranched fluoropolymer...

Large dinosaurs were extremely hot in their day, UF study finds

...versity of Florida suggests it may have had a body temperature close to 48 degrees Celsius. That is a 118-degre...idered by the researchers, probably had a cruising temperature of about 33 degrees Celsius, which is just over 91 degrees Fahrenheit, according to lead researcher ...

UCI scientists find chlorine may contribute to ozone formation

...levels and meteorological conditions such as wind, temperature or relative humidity or existing pollution levels. They also don't know for sure what created the chlorine they detected. "We found more chlorine in the daytime than expected. It must be rapidly produced, because sunlight destroys it so quickly," Sa...

Global warming may have damaged coral reefs forever

...e first report to show the long-term impact of sea temperature rise on reef coral and fish communities. Large sections of coral reefs and much of the marine life they support may be wiped out for good, say the international team of researchers, who surveyed 21 sites and over 50,000 square metres of coral reefs...

Ready, set, mutate?and may the best microbe win

...e bacteria for one month in fermentor, raising the temperature a half degree Celsius each day. Over a span of 1,500 generations, the percentage of mutant strains inside the fermentor ebbed and flowed as the single-celled microbes competed for dominance. Eventually, one strain squeezed out almost all the competi...

Primates take weather into account when searching for fruits

...eralized understanding of the relationship between temperature and solar radiation and the maturation rate of fruit and insect larvae. The findings are also consistent with the idea that the evolution of primate cognitive skills has proceeded, at least in part, as a result of ecological challenges associated wit...

Tiny airborne particles are a major cause of climate change

...rounding atmosphere and reducing the difference in temperature between the Earth's surface and the upper atmosphere. This combination prevents atmospheric instability ?the condition needed to form clouds and rain. A stable atmosphere means fewer clouds; fewer clouds mean less reflection of sunlight; less reflect...

Heart has enough oxygen to survive hypothermia, CPR crucial

...r examined the rats' heart cells. When core body temperature was lowered to 15°C, both hypothermic groups experienced a similar reduction in circulating blood volume. And both showed that the physiological mechanisms that help transport oxygen and help unload oxygen from hemoglobin were working. "As a conseque...

The vicious cycle of rainforest destruction

...t of carbon in the atmosphere, raising the earth's temperature and magnifying the impact on the rainforests. Hea... on the Earth system in terms of carbon emissions, temperature and rainfall. These changes will then be fed back into the models to determine their cumulative impa...

Despite acidity, orange juice could still be a source of foodborne disease

...ogens or toxin production without storage time and temperature controls are defined by the U.S. Food Code as non-potentially hazardous foods. But this designation also includes foods that do not support growth but still may contain pathogenic organisms at sufficient levels to cause disease. "For many years ind...

Genetic tug of war determines sexual differentiation

...rentiation, Capel said. For example, environmental temperature is the key to whether reptiles develop along male ...study this summer to better understand the role of temperature on sex determination in a turtle that she hopes can shed light on the general issue of sex determina...

Food-crop yields in future greenhouse-gas conditions lower than expected

...nel on Climate Change, suggest that increased soil temperature and decreased soil moisture, which would reduce cr...search to examine simultaneous changes in CO2, O3, temperature and soil moisture." While projections to 2050 may be too far out for commercial considerations, the...

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