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Tag: "temperatures" at biology news

Plants' role in global warming re-examined

...sed plant respiration in response to higher global temperatures may be somewhat overstated as they have not taken ...iration. "The fact is that plants adapt to higher temperatures and their levels of respiration adjust downward." While some previous climate-carbon simulations ha...

With record resolution and sensitivity, tool images how life organizes in a cell membrane

...ed in illustrations in the paper, melted at higher temperatures than short lipids, represented by green. The researchers melted the lipids together, then placed them on a surface to cool and separate into splotchy patterns. This is the system that Longo had developed for other purposes in earlier work. ''The tal...

Scientists use an 'ice lolly' to find polar bacteria in their own backyard

...his study promote the formation of ice crystals at temperatures close to melting, a property which is useful in the production of artificial snow. Pseudomonas borealis is one species which is not only ice-forming, it is also thought to be tolerant to cold and could therefore have advantages for snow-making in ar...

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

...es influenced nymphal infection prevalence, higher temperatures in the previous year and precipitation patterns in...nsity of infected nymphs. It's thought that higher temperatures keep tick populations down, but the models showed them increasing both total density and density of ...

Report warns about carbon dioxide threats to marine life

...on says. Mass bleaching occurs when unusually warm temperatures cause the coral to expel the colorful microscopic algae that provide the coral polyps with food. Many calcifying organisms--including marine plankton such as pteropods, a planktonic marine snail--are affected by the chemistry changes. Shelled pterop...

Triple threat polymer captures and releases

...network of the host material. "We found that the temperatures at which the guests left the material were dependent on the composition of the host, and when the release of the small guest molecules was monitored from just an empty TGA pan, there was a slight difference versus those guests in the presence of eith...

Researchers appeal for new regulations to save coral reefs from live fish trade

...pollution, coral bleaching triggered by rising sea temperatures and over-fishing. In particular, the health of the reefs is being compromised by the live reef fish trade, a serious threat that has prompted scientists to call for tighter regulations on the exploitation of reef resources which are particularly i...

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

...er with the NCEAS. "If these animals functioned at temperatures of 35 or 40 degrees centigrade, it suggests that t...out 108 degrees. Researchers determined dinosaur temperatures -- long a subject of debate in biology -- by combining their understanding of relationships among bo...

Global warming may have damaged coral reefs forever

...t where global warming caused Indian Ocean surface temperatures to increase to unprecedented and sustained levels, killing off (or 'bleaching') more than 90 per cent of the inner Seychelles coral. The team, led by the University of Newcastle upon Tyne, and which comprises researchers from the UK, Australia and...

Arctic coring expedition continues to yield new clues

...xide or methane, occurred during the PETM. Surface temperatures also rose in many places by as much as 15 degrees Fahrenheit in the (relative) geological instant of about 100,000 years. Arctic sediment samples were largely unavailable until 2004, when ACEX scientists recovered the first deep-ocean sediment sam...

Tropical forest CO2 emissions tied to nutrient increases

...s. According to the National Academy of Sciences, temperatures on Earth have risen by more than 1 degree F in the past century due to build-up of greenhouse gases in the atmosphere, primarily CO2. According to the academy, the warming process has intensified in the past 20 years has been accompanied by retreati...

Healthy coral reefs of Madagascar resisting damage from climate change

... far resisted the damaging effects of warmer ocean temperatures attributed to global climate change, say scientists who recently studied the region. The survey of a previously unexplored region in March 2006 by scientists from Conservation International and its partners documented a much greater variety of life ...

Bacteria beat the heat

... a difference between functioning best at moderate temperatures and being adapted to living in extreme heat. The r... amino acids in the enzyme adapted to the moderate temperatures with those of the heat-loving enzyme, they observed an increase of about 10 degrees in the average t...

Ocean acidification threatens cold-water coral ecosystems

...p of CO2 in the atmosphere. Above-average seawater temperatures have caused coral bleaching events throughout the world, and the calcification rates of corals exposed to more acidic conditions in laboratory experiments have shown worrisome declines," says Guinotte. "But now we suspect that this increase in CO2 ...

Taking evolution's temperature: Researchers pinpoint the energy it takes to make a species

...ational Academy of Sciences, scientists say higher temperatures near the equator speed up the metabolisms of the i...of this type of plankton with differences in ocean temperatures at different latitudes ranging from the tropics to the arctic. The results agreed closely with predi...

Biodiversity key to sustainable biofuel according to University of Minn. researcher's findings

...on varied more than twofold and average daily high temperatures ranged from 21.5 C to 24.4 C. Stability was dependent on diversity and root mass. Roots store nutrients and buffer against climate variations. Prairie plants, which are perennials, have far more root mass than crops such as corn, which must be replan...

MIT researchers build tiny batteries with viruses

...ns needed to create nanowires occur at normal room temperatures and pressures, so there is no need for expensive pressure-cooking technology to get the job done. The work is important, too, because energy density is a vital quality in batteries. A lack of energy density - meaning the amount of charge a battery o...

Possible brain hormone may unlock mystery of hibernation

...y, which allows them to survive unusually low body temperatures at or near freezing," said study author Takashi Ohtsu of Kanagawa Academy of Science and Technology in Japan. Scientists have attempted for decades to identify substances responsible for hibernation in the blood and organs of hibernating animals but ...

'Dead zone' summer killed billions of ocean state mussels

...osphorus and other nutrients. Often fueled by warm temperatures and a lack of circulation, this nutrient rush can cause algae blooms. When the algae dies, it sinks to the bottom, where it is consumed by bacteria ?along with dissolved oxygen. This is what happened in Narragansett Bay in the summer of 2001 and agai...

Molecular mechanism may explain how fevers spark seizures

... and have fevers. Usually, those elevated internal temperatures cause only temporary discomfort, but in some small children they spark convulsions called "febrile seizures." These convulsions are "scary and very upsetting to parents," said Robert L. Macdonald, M.D., Ph.D., professor and chair of Neurology. They...

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