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Tag: "absence" at biology news

Cells re-energize to come back from the brink of death

... these vital components. “We found that in the absence of caspase activation, cells that avoided CICD took about a week or so to begin multiplying again,” Green said. “This might represent the time it takes for the cell to restore enough mitochondria to allow the cell to function normally.” The disc...

Modeling the restless brain

...take a different view. We believe that even in the absence of an external stimulus, there are very important processes going on in the brain which affect the stimulus-responses that the brain will produce. We believe that ongoing spontaneous activity should be studied in itself. Other researchers consider th...

Prey not hard-wired to fear predators

...d chronicled their reactions. As expected, in the absence of predators, the elk, moose, bison and caribou did not show the kind of vigilance, clustering behavior and flight observed in the same species living with wolves, bears or tigers. For example, elk in the mountains of Siberia—who subsist alongside ...

Gene therapy study shows safety and statistically significant improvement in Parkinson's disease

...de of the brain receiving treatment. Moreover, the absence of change at the earliest time point following treatment suggests that the improvement was not likely due to the surgical lesioning of the targeted brain region, as surgical approaches typically give rise to immediate, short-lasting benefit around th...

Ancient retrovirus sheds light on modern pandemic

...en the chimp and human genomes was the presence or absence of PtERV1," Emerman said. "Chimps have 130 copies of PtERV1 and humans have none." It is believed that retroviruses have been entering the genome for many millions of years, and so humans share many retroviral DNA fragments with their primate cous...

Researchers use MRI to predict recovery after spinal cord injury

...ors of a poor prognosis after SCI. Conversely, the absence of these symptoms indicated a good chance for neurological recovery even if the injury otherwise appeared severe. "Since the severity of spinal cord compression is a predictor of outcome after SCI, this study suggests that MRI may predict which pa...

Nitric oxide: Key to cardiovascular and pulmonary function and drug effectiveness

...tors. The researchers believe that the presence or absence of nitric oxide or SNOs determines whether these receptors continue to function properly. This action is controlled by the ability of nitric oxide to inhibit a key regulatory system which ordinarily shuts the receptors off after they are stimulated ...

Female-led infanticide in wild chimpanzees

...east two infant offspring of other females. In the absence of significant additional evidence for such behavior among female chimpanzees, speculation had been that female-led infanticide represented pathological behavior, or was a means of obtaining nutritional advantage under some circumstances. As the r...

Latent memory of cells comes to life

...dden changes are observed in one individual in the absence of any kind of change to the DNA. This happens in fact in all of us as our body develops: cells with identical genetic information adopt very different fates, forming tissues that have apparently very little in common with each other, such as skin, b...

Rapid response was crucial to containing the 1918 flu pandemic

... experienced significant epidemics because, in the absence of an effective vaccine, the virus continued to spread or recurred as cities relaxed their restrictions. The second study also shows that the timing of when control measures were lifted played a major part. Cities that relaxed their restrictions a...

Researchers find link between food odors and lifespan in fruit flies

...fferent strains of fruit flies in the presence and absence of food odors ?specifically live yeast, which is a...fferent strains of fruit flies in the presence and absence of food odors ?specifically live yeast, which is an important component of the flies' diets. Exposur...

Cure for cancer one step closer

...of The Wesley Research Institute, said the current absence of large, high quality cancer tissue and blood collections with clinical data is a major barrier to improving care of cancer patients. "Queensland research has taken an enormous step forward this week. There is every possibility that findings made...

Gut research yields new anti-cancer approach

...e when removed from the gut wall. Living on in the absence of normal survival signals makes cancer cells dangerous in the body, but useful as cell lines for study. While comparing PPARgamma activators and inhibitors, Schaefer noted with frustration that her cancer cells were dying before she could comple...

RNA splicing factor implicated in ovarian tumor cell growth

...ount for the dismal mortality outcomes. One is the absence of reliable early detection markers, and the other is inadequacy of present therapy for advanced disease. To improve patient survival, it is critical to identify new biomarkers for early detection." Polypyrimidine tract-binding protein is a key re...

ConocoPhillips establishes $22.5M biofuels research program at Iowa State

...gh fast pyrolysis, a process that uses heat in the absence of oxygen to decompose biomass into a liquid product. This so-called bio-oil can be used as a heating oil or can be converted into transportation fuel at petroleum refineries. Brown said ConocoPhillips also will sponsor studies of other thermoche...

Loss of a universal tRNA feature reported

...istry at Yale University, commented: "The observed absence of the extra guanylate in tRNAHis is a unique case of divergence from a highly conserved ancient tRNA recognition mechanism by an aminoacyl-tRNA synthetase. It will be of special interest to examine if the loss of this tRNA feature has resulted from ...

New recommendations against a major opportunistic infection -- cryptococcosis

... some countries affecting up to 30% of them in the absence of access to antiretroviral drugs. It is now the first cause of meningitis among adults in Africa. A vast cohort study was performed on patients diagnosed with cryptococcosis between 1997 and 2001 in France by Françoise Dromer, head of the Molecul...

Shedding new light on proteorhodopsin

...ed when they were exposed to red light." In the absence of the azide respiratory poison, green light had no effect on the flagellar motors of these proteorhodopsin-equipped E. coli. By measuring the pmf of individual illuminated cells under different concentrations of azide or various degrees of lighting...

Scientists use nanoparticle to discover disease-causing proteins

... or fluorescent labels to identify the presence or absence of a protein that can be further developed for use as a disease indicator, or biomarker. Snake venom cells were used because they have a very high concentration of proteins similar to some found in human blood, Tao said. The proteins apparently ar...

Researcher to study astronaut bone loss for space biology agency

...led skeletal unloading –?lose bone because, in the absence of gravity, they lose the ability to make enough new bone cells to replace old cells that die in the normal course of bone metabolism. After their return to Earth's gravity, an event known as reloading, bone cell production can take months to return...

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