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Tag: "shifts" at biology news

New understanding of jet lag

...s that fall out of synchrony during light schedule shifts of six hours, the time it takes to fly across the ...s (SCN), the brain's central timekeeper, adjust to shifts in light schedules at vastly different rates, potentially causing the difficult period of adjustment...

Temperature regulates circadian clock in zebrafish

...e zebrafish clock, Lahiri et al. show, and precise shifts in temperature trigger significant changes in the ...exposed to constant temperature. Acute temperature shifts can also trigger significant changes in clock gene expression (transcript levels of per4 and cry3 dr...

Microreactor efficiently regenerates cofactors for biocatalysis

...ance of individual microreactors, the present work shifts the emphasis from the longstanding problem of cofactor regeneration to a more tangible engineering challenge, Kenis said. "Now we need to integrate a large number of these microreactors in a recirculating system to enable the biocatalytic synthesis o...

Scientists discover global pattern of big fish diversity in open oceans

...aying detailed information on animal movements and shifts in local oceanographic habitats will help refine actual boundaries for marine parks. Scientists hope that the global perspective provided by this paper will encourage fisheries managers to move out of a single species and single location mindset, ad...

UN: World in big ecological mess

...oastal "dead zones," the collapse of fisheries and shifts in regional climate are just some of the potential consequences of humankind's degradation of the planet's ecosystems, according to a new United Nations-backed report launched today. Humans have changed ecosystems more rapidly and extensively in the...

Study of energy and health in Africa focuses spotlight on charcoal and forest management

...ded deaths. However, scenarios that forecast large shifts to charcoal without improvements in harvesting and production would lead to severe increases in greenhouse gas emissions, they said, with over 15 billion tons of carbon released into the atmosphere by 2050. "Most charcoal is produced in Africa by on...

Scripps scientists find potential for catastrophic shifts in Pacific ecosystems

...yzed the underlying dynamics responsible for major shifts in biological and physical conditions of the North... by periods of rapid transition. Regimes and rapid shifts between regimes are features that arise from so-called "nonlinear" interactions (where mutual effect...

Changing ecosystems throw scientists mega-challenges

...ury. Among the changes the report cites are rapid shifts in climate and ecosystems, the degradation of freshwater resources, global spreading of diseases, and the increasing threat of biological and chemical terrorism. Among the research challenges are the need to understand how and why these changes are o...

The circadian clock: Understanding nature's timepiece

...s about a day to fully adjust. Workers on rotating shifts are constantly struggling to adapt and they experi...tudy found that nurses who work nights or rotating shifts are at greater risk for developing breast cancer than their counterparts on regular day shifts. "If...

Gladstone investigators discover how resting T cells avoid HIV infection

...sity of California, San Francisco. "This study now shifts the paradigm, showing that resting CD4 T cells actively repel HIV infection through the action of the small, enzymatically active form of A3G, which stops the virus in its tracks." CD4 T cells are a class of lymphocytes, or white blood cells, that f...

Gray wolves maintain the food chain in winter

...rts and help species adjust to major environmental shifts like climate change. Crucially, Wilmers and Getz's study shows that a robust food chain - including this still embattled top predator - may be even more important as ecological conditions deteriorate. ### Citation: Wilmers CC, Getz WM (2005) Gray w...

Scientists find fossil proof of Egypt's ancient climate

...rstand how people would have responded to dramatic shifts in climate," said Smith. "This is a major theme of our work, and we hope that some of our findings can give us perspective on what we're facing in the coming centuries." ...

Highly adaptable genome in gut bacterium key to intestinal health

A bacterium that lives in the human gut adaptively shifts more than a quarter of its genes into high gear when its host's diet changes from sugar to complex carbohydrates. This adaptive mechanism not only allows the bacterial species to survive rapidly changing nutrient conditions but also helps maintain t...

Essential mangrove forest threatened by cryptic ecological degradation

...f fresh water. The consequences range from adverse shifts in the composition of mangrove tree species to disrupted ethnobiological relationships, lagoon fisheries, and many additional functions provided by mangroves. The authors believe that the worrying aspect of the research is that a degradation of the ...

The secret lives of whales

...the distribution of zooplankton, and suspects that shifts in singer distribution coincide with shifts in food distribution. Now, he is studying reactions of whales to sound pollution, tracking how whale...

Timing is everything: First step in protein building revealed

...t once the RNA was mixed in. Instead, they saw two shifts in thecolor given off. First, there was a slight shift, indicating a smallchange in the distance between eIF1 and its relative, and then a muchlarger shift, indicating a much bigger separation.To prove eIF1 was being released from the ribosome comple...

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