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Tag: "factor" at biology news

High carbon dioxide levels spur Southern pines to grow more needles

...t," she said. McCarthy's findings showed that the factor most affecting needle volumes was the amount of nitrogen present in the soils. Since much of the forested area was once overused farmland, local soils tend to be nitrogen deficient. Her results showed that needle enhancements in CO2-treated trees we...

New law for resolution allows unprecedented sharpness in fluorescence microscopy

... differs from Abbe's original formula in a crucial factor - a square root term [1,2]: In one of their latest publications [2], the Göttingen-based research team verifies this new law with their experiments. They show that even with conventional objectives and focused light, resolutions of 16 nm are feasibl...

Molecular mechanism of feather formation found

... to believe that the addition of a third signaling factor leads to the development of the more complex pennaceous feather," Fallon says. " Our model supports paleontologic evidence that pennaceous feathers are more advanced than plumalaceous feathers." ...

Molecular trigger for Huntington's disease found

...and colleagues. "As p53 is a nuclear transcription factor that regulates various mitochondrial genes and insofar as mitochondrial dysfunction appears important in HD, our findings provide a molecular mechanism linking disturbances of nuclei and mitochondria in HD." Byoung-Il Bae, Shuichi Igarashi, Masahiro...

Environment, not genes, key in family relationships

...a genetic background. The researchers completed a factor analysis of the data, finding three factors to explain the nine attributes: Overall good or poor adjustment. This explained positivity or negativity in family relationships, social responsibility, antisocial behavior, and depressive symptoms. Ind...

miRNAs and musculature

...on is regulated by the promesodermal transcription factor Twist and the promyogenic transcription factor Mef2, thus placing Dmir-1 within established transcriptional networks in muscle. However, the autho...

Genetic variation alters response to common anti-clotting drug

...ple's responses to the drug and could be a central factor in setting the initial dose." The team also learned that certain population groups tended to have a higher prevalence of a particular VKORC1 variation. While Asian Americans generally had the low-dose variation, African Americans had the high-dose v...

Agricultural antibiotic use contributes to 'super-bugs' in humans

.... But for some antibiotics, an even more important factor contributing to such emergence, argues a team of researchers in the open access international medical journal PLoS Medicine, is the use of antibiotics in agriculture. "Evidence suggests that antibiotic use in agriculture has contributed to antibioti...

Researcher at UGA College of Veterinary Medicine identifies new way of combating viral diseases

...chers identified a cellular protein called Rab9 ?a factor required for viruses to reproduce in a cell.Disrupting Rab9 prevented the replication of four different viruses ?Marburg, Ebola, HIV-1, and measles viruses. "We believe that interfering with the Rab9 pathway interferes with the ability of the viruse...

Studies clarify risk factors for mother-to-child transmission of hepatitis C virus

...d with transmission were the time in labor (a risk factor in both studies) and use of internal fetal monitoring devices (a risk factor in the U.S. study only). Although breastfeeding is a known risk for HIV transmission, both studies ...

'Patient-choice' C-section rate rises 36%: HealthGrades study

...ion rates from "patient-choice" C-sections are one factor in the ratings of maternity care at more than 1,500 hospitals, which HealthGrades posts free of charge for consumers at www.healthgrades.com . The ratings are designed to let women compare the quality of maternity care among local hospitals. Dr. Sa...

Tiny roundworm's telomeres help scientists to tease apart different types of aging

...worms, telomere length is certainly not a limiting factor for lifespan," says Karlseder. The Salk team, which also included graduate student Hugo Maruyama, found that despite the close correlation of telomere length and cellular senescence in mammalian cells, worms with long telomeres were neither long liv...

A 'dimmer switch' for genes

... studied Ets-1, a protein known as a transcription factor that helps read genetic information. This factor serves as a cell's librarian, helping find the right genetic instructions. How much information the...

Hepatitis C complicated by morphine withdrawal

...ation and inhibits IFN-alpha (a natural anti-viral factor produced by immune, as well as host cells, and the...al promotes HCV expression by suppressing anti-HCV factor (IFN-alpha) production by liver cells suggests that �opioid abuse may contribute to the chronicity o...

Study shows big game hunters, not climate change, killed off sloths

...ences paper this week. "If climate were the major factor driving the extinction of ground sloths, you would expect the extinctions to occur at about the same time on both the islands and the continent since climate change is a global event," Steadman said. Gary Haynes, anthropology professor at the Univer...

DNA size a crucial factor in genetic mutations, study finds

...Kool, these results indicate that size is a strong factor determining enzyme efficiency-and a mechanism for allowing mutations into the DNA molecule. ''It's a way the organism can evolve,'' Kool says. ''If the protein that copies DNA prefers a molecule that's slightly bigger than natural DNA, then it can a...

Study provides insight into cellular defenses against genetic mutation

...irst time that CBP80 works by activating a protein factor known to drive NMD called human up-frameshift (hUp...immediate decay, we have also learned that the NMD factor Upf1 is part of a related process that regulates the expression of many normal genes by controlling ...

Smoking damages key regulatory enzyme in the lung

...ls of MAO A in smokers' lungs may be a significant factor contributing to some of the physiological effects of smoking, including changes in blood pressure and pulmonary function. Smokers' lungs also held onto the tracer chemical much longer than nonsmokers, and the delivery of tracer into the arterial blo...

New factor implicated in allergy and asthma attacks

...have discovered strong evidence that an additional factor is necessary to cause the severe respiratory infla...tion involved in an allergy or asthma attack. This factor is the damage caused by chemically hyperactive molecules known as "reactive oxygen species," which a...

HIV inserts into human genome using a DNA-associated protein

...py patients. "This is first example of a cellular factor that's a clear player in target site selection," says Bushman. "This isn't engineering yet, but it's a key piece of information on the way." ...

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