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Tag: "hours" at biology news

A steady, high-fat diet is bad, but the news gets worse

...ts to balance it for sodium and potassium. Two hours later the two groups were subjected to standard physical and mental stress tests while having their cardiovascular responses measured. They performed a mathematical test designed to be stressful, completed a public speaking exercise about something e...

Bumblebee house warming -- it takes a village

... colony's remaining incubators responded within 24 hours by increasing their rate of incubation, rather than having workers involved in other jobs switch tasks, said O'Donnell. Bumblebee workers vary considerably in size, and body size affects which tasks individuals perform. "We expected that larger...

Morphine makes lasting -- and surprising -- change in the brain

...mpact was powerful: LTP continued to be blocked 24 hours later ?long after the drug was out of the animal’s system. "The persistence of the effect was stunning," Kauer said. "This is your brain on drugs." Kauer recorded the phenomenon in the ventral tegmental area, or VTA, a small section of the midb...

Hay fever can send work productivity down the drain

...rs can blame hay fever for the loss of millions of hours of work productivity this spring. A new study of .... “That means the potential loss of millions of hours of work productivity, not to mention the associated economic costs,?she said. Some estimates suggest...

The influence of the menstrual cycle on the female brain

... trigger ovulation, which occurs between 36 and 48 hours after the LH peak. An increase in brain activity with anticipation of uncertain monetary rewards is observed. During the follicular phase, this is in the amygdala and the orbitofrontal cortex. (The higher the T values, the more the colors go from...

Drug treatment improves learning in mice with Down syndrome symptoms, Stanford/Packard study shows

...sly different, objects for 15 minutes. Twenty-four hours later he exposed the same animals to one of the previously seen objects and a third, never-before-seen object. Although wild-type mice spent more time investigating the new object, untreated Down syndrome mice showed no preference for either object. ...

Breathing easy: When it comes to oxygen, a bug's life is full of it

...sium chairman. “They can shut down and survive for hours or days. They have a low metabolic rate and can close their spiracles. If you compare Lance Armstrong, the bee and the hummingbird, the bee is the champion of oxygen delivery,?he said. But at the same time, insects can survive low levels of oxygen fo...

Cancer cells forming blood vessels send their copper to the edge

... form capillary-like structures within about eight hours of being stimulated with specific growth factors. We then examined the distribution of elements in these structures by using imaging resources." The APS played a key role in the research. The particular APS beamline Finney and her colleagues used ...

Unique tomatoes tops in disease-fighting antioxidants

...rticipant ate and again every hour or two up to 10 hours after the meal. They analyzed the blood samples fo... varieties. Cis-lycopene levels spiked around five hours after eating the tangerine tomato sauce, and at this point during absorption the levels were some 20...

Virginia Tech's System X supercomputer provides super tool for simulation of cell division

...ter." In fact, it required more than 20,000 CPU hours on System X, a 2200 processor parallel computer, using two new algorithms, DIRECT (DIviding RECTangles) and MADS (Mesh Adaptive Direct Search), to estimate the 143 parameters. "With a tool like this scientists can spend more time working on the m...

Decoy pill saves brain cells

... added, for the "window of opportunity" in the few hours after a stroke. While a stroke kills some brain cells right away, others take much longer to die. If the stroke triggered a calcium-calpain feedback loop, treatment with decoy peptides might save some cells, Baudry said. His group plans to test...

Cloned mice created from fully differentiated cells, a milestone in cloning research

... live cloned pups, although both died within a few hours of birth. As a control, the researchers performed nuclear transfer using embryonic stem cells; 49 percent developed to the blastocyst stage and 18 cloned pups were born. "Our results clearly demonstrate that there is no apparent advantage in using e...

New study aims to stop sepsis in its tracks

...n known as sepsis, which can be fatal within a few hours and is often not diagnosed until it is too late. ... ways of managing the disease during the first six hours after diagnosis, the consortium will train teams of doctors, nurses, and other emergency department ...

Negative effects of caffeine are stronger on daytime sleep than on nocturnal sleep

...ved a capsule of 100 mg of caffeine (or placebo) 3 hours before bedtime, and the remaining dose 1 hour before bedtime. Compared to placebo, caffeine lengthened sleep latency, increased stage 1, and reduced stage 2 and slow-wave sleep (SWS) in both groups. However, caffeine reduced sleep efficiency more str...

Einstein researchers demonstrate a novel approach to treating AIDS

...antiretroviral therapy (HAART) to people within 24 hours of exposure to HIV can prevent infection from developing," he says. "But if several days have passed, the virus is able to infect enough cells to cause a chronic HIV infection. By combining HAART with radioimmunotherapy, we may be able to prevent lif...

'Protecting virus' offers instant flu protection and converts flu infections into their own vaccines

...l infection and offer protection if given up to 24 hours after first infection (and possibly longer). Exi...otecting virus' also protects when given up to 24 hours after infection (and possibly longer). It is thus able to counter an actual infection. It could ther...

Proteins necessary for brain development found to be critical for long-term memory

...he shock. While short-term memory was retained, 24 hours later the snails -- which normally would remember the events of the previous day -- exhibited no memory of the shocks. Carew and colleagues went on to show that, when the actions of the growth factors were prevented, long-term enhancement of the con...

Learning during sleep?

...the hippocampus. They are then said to move within hours or a few days - usually during deep sleep - into the cerebral cortex where they enter long-term memory. Investigations by Thomas Hahn, Mayank Mehta and the Nobel Prize winner Bert Sakmann from the Max Planck Institute for Medical Research in Heidelbe...

Tracing the formation of long-term memory

...posed the fruit flies or Drosophila to the odor 24 hours after spaced training, they saw much more calcium flowing into the mushroom body neurons. The increased calcium influx paralleled the long-term memory of the flies. Using special laboratory techniques, he and others in the lab showed that they could ...

Need to pull an all-nighter?

...sleep-deprived rats ?kept awake for an extra three hours ?they found that nitric oxide production in the basal forebrain, but not in other parts of the brain, increased, by 50 to 150 percent. When they injected compounds that inhibit nitric oxide production into this region of the brain, adenosine levels ...

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