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Tag: "previous" at biology news

Dust to gust

...n region every year, a much higher figure than the previous estimates of 13 million tons. The new estimate matches the calculations on the quantity of dust needed to supply the vital minerals for the continued existence of the Amazon rainforest. The researchers suggest that the Bodélé valley is such an imp...

Cell wall of pneumonia bacteria can cause brain and heart damage

... the bloodstream enter neurons (brain cells). In a previous report published in the July issue of Infection and Immunity, St. Jude researchers reported that in the mouse model, cell wall fragments damaged neurons in the part of the brain called the hippocampus. Tuomanen is senior author of both reports. In ...

Killing brain tumors from within: A 'Trojan horse' approach

... research on cancer development and treatment. His previous work has already led to successful therapy in treating leukemia and some lung cancer patients....

Viral marker of human migration suspect

...l of Virology. The researchers note that while previous studies of genetic variation have observed some differences between the distribution of JCV and human populations, the extent of the differences in their evolutionary histories has never been fully tested. Shackelton and her colleagues analyzed 33...

Plants' role in global warming re-examined

...evels of respiration adjust downward." While some previous climate-carbon simulations have included differentiation among vegetation types, none have incorporated an explicit time-dependent acclimation of plant respiration to increasing temperatures. ORNL researchers also looked at the influence of temperatu...

New genetic analysis forces re-draw of insect family tree

...e distantly related to bees and wasps, contrary to previous theory. The findings are published in the special Honey Bee Genome issue of the journal Genome Research which coincides with Nature's publication of the honey bee genome sequence (also Thursday 26 October 2006). The results are based on an an...

Jumping gene could provide non-viral alternative for gene therapy

...y can insert wherever they want." Dr. Kaminski's previous work, published in 2002 in The FASEB Journal, hypothesized that the integration site for transposons can be selected. "Typically, viruses and transposons will integrate anywhere along the genome," he says. "If they integrate anywhere, it can obviousl...

Solvent exposure linked to birth defects in babies of male painters

...e chemicals are contributing to birth defects, and previous studies are inconclusive. Of particular concern, said Dr. Burstyn, is that all of the levels of exposure to solvents investigated in the study were well within Dutch regulations and occupational exposure limits established in the United States and...

AIDS study challenges conventional treatment guidelines for HIV patients

...most critical. Current clinical practice, based on previous work from other groups, is to focus on both the current CD4 count and the viral load to estimate how rapidly a person's CD4 cell count will decrease. This approach is based on comparisons of the average rate of CD4 cell loss among groups of patients ...

Air travel and pandemic flu

...place, the virus could spread more quickly than in previous pandemics. Restrictions on international travel might be considered necessary, particularly travel by air. However, it is important to estimate how useful restrictions on air travel might be in controlling the spread of a flu virus. Travel restrictio...

Epstein-Barr virus might kick-start multiple sclerosis

...ased antibody responses to certain EBV proteins in previous studies, Lünemann said. "Very recent investigations have shown that such enhanced responses occur years before onset of clinical symptoms of MS," he noted, indicating that EBV plays an important role early in the development of the disease. "Our aim...

St. Jude test of bird flu vaccine proves successful

...California. This finding, coupled with results of previous studies that showed protection against multiple hu...rotein is known to mutate readily, thereby foiling previous immune responses it triggered--whether due to natural exposure or vaccination. The other version of ...

Control measures fail to stop spread of new H5N1 virus

...H5N1 emerged in late 2005 and replaced most of the previous variants across a large part of southern China, de...nto different sublineages also occurred during the previous two waves of H5N1 transmission that occurred during the past several years, according to the investi...

Thermal imaging shatters arousal gender gap myth

...is some distraction," said Binik. "But compared to previous techniques involving invasive measures or electrodes, this is minimally invasive and the same measurements are used for men and women, which makes it very interesting that the data ended up being the same." Dr. Binik's PhD student, Tuuli ...

Electric fish in Africa could be example of evolution in action

...eated by fish in the water. They know from their previous research that the various groups of local electric fish have different DNA, different communication patterns and won't mate with each other. However, they now have found a case where two types of electric signals come from fish that have the same DNA...

Interfering RNA silences genes in 'slippery' immune cells

... decreasing gene expression by HALP. Because their previous research strongly suggests that HALP promotes latent HIV infection, the new technique has a potential application to HIV treatment. "The siRNA may represent a suicide vector: by knocking down HALP it may allow HIV-infected cells to self-destruct, thu...

RNA found in the cellular centrosome of surf clams

...ntrosome of the cell has been ruled out by others' previous work, the presence of RNA had not been confirmed or denied until now," says Palazzo. "Our results show there are at least five specific forms of RNA in the clam cell centrosome which could be related to structure, encoding of proteins, or the regulat...

More than drought affecting wheat yields

... "We've had quadruple the number of samples as any previous year," he said. Once a crop is diagnosed with one of the viruses, there is little the producer can do, Allen said. Widespread cases can reduce yields enough that only grazing or making silage from the crop can salvage any income. In many cases, the ...

Where have all the butterflies gone?

...lars of the painted lady. Shapiro said that, as in previous dry winters, the painted lady butterflies had given up on trying to breed in the desert and headed north; a handful were seen in Davis on Feb. 11. Shapiro and his students have seen only one painted lady in the area in recent weeks, when the migratio...

Just like us, social stress prompts hamsters to overeat, gain weight

...ncreased stress," the authors wrote. "In addition, previous research suggests that unpredictable events cause greater activation in brain regions responsible for fear and anxiety in laboratory rats and reduction in immune function compared with events that are predictable." Next steps Syrian hamsters prov...

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