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Tag: "stable" at biology news

Bumblebee house warming -- it takes a village

...ooler climates is their ability to maintain fairly stable body temperatures when flying to flowers. Whether and how they maintained nest temperature was poorly understood. But now scientists from the University of Washington and the University of Puget Sound have peered into bumblebee colonies and have di...

Discovery of an HIV inhibitor in human blood points to new drug class

...ng that some derivatives of the peptide are highly stable in human blood plasma and are nontoxic even at exceedingly high concentrations. According to the latest World Health Organization estimates, nearly 40 million people worldwide are living with HIV/AIDS, including more than 2 million children. Close...

Intravenous nanoparticle gene therapy shows activity in stage IV lung cancer

...f eight who received two or more doses experienced stable disease for three to seven months. Median survival time for all patients is 14.6 months, which Lu notes compares favorably to a seven-month median survival time for patients receiving second line therapy. All patients on the trial had been trea...

Some caterpillers just don't want to grow up

...e-infection in the next season ?favor evolutionary stable fractions of slow developers up to 50%. However, among all arguments suggested so far, only a "priority effect" ?the competitive asymmetry between last year's slow and this year's fast developing caterpillars ?can explain why more than 50% of caterpi...

New synthetic self-assembling macromolecules mimic nature

...emble and the aggregated structures are remarkable stable in saline solution, Turner said. "The early res...o such natural polymers as DNA," said Turner. "The stable self-assembled structures could have potential applications in drug delivery and gene delivery syste...

Amur leopard still on the brink of extinction, scientists say

...lometers of habitat with good forests and high and stable amounts of ungulates, including deer. Two to four female leopards would live in the same amount of land, reproduce and nourish their cubs. "Maybe this is the reason why leopards practically completely disappeared from the Korean Peninsula and nort...

New research shows that flu is a trigger of heart attacks

...clerosis. However, in some patients the quiescent, stable atherosclerotic plaques undergo sudden changes, mainly due to exaggerated inflammation, leading to rupture of these vulnerable plaques and subsequent formation of clots resulting in heart attacks. "This study shows that flu is an important trigge...

Global 'sunscreen' has likely thinned, report NASA scientists

... dropped as much as 20 percent from the relatively stable level between 1986 and 1991. The NASA study also sheds light on the puzzling observations by other scientists that the amount of sunlight reaching Earth's surface, which had been steadily declining in recent decades, suddenly started to rebound ar...

Bats prey on nocturnally migrating songbirds

... Swiss Ornithological Institute). The technique of stable isotopes was applied because this recently developed method allows tracking species' main dietary specializations and trophic level position along food chains. The researchers concentrated on carbon and nitrogen isotopes, which are among the best die...

No carrier necessary: This drug delivers itself

...m. "It's a controlled formation of a colloidally stable suspension of nanosized crystals,?explained Tymish Ohulchanskyy, Ph.D., UB senior research scientist and a co-author. The researchers originally were investigating nanocrystals as a delivery method for hydrophobic dyes in bioimaging applications, a...

Biologists prove critical step in membrane fusion

...e researchers show that hemifusion is surprisingly stable in live cells. "The novelty of these results is that a live cell can maintain a hemifused state for hours, days, even months," said Julian Wong, a postdoctoral research associate in the Wessel lab and the first author of the journal article in Dev...

Canada's new government invests $200M in the fight against the mountain pine beetle

...the industry meet its challenges and ensure a more stable future for forest-based communities and economies. Canada is the world's largest exporter of forest products, with about one third of Canada's potential harvest coming from British Columbia. Canada has 10 percent of the world's forests, including...

Genes and biomarkers that allow doctors to choose the right therapy for the right patient

...on, as compared to 35 percent of the patients with stable disease or 55 percent of the patients with progressive disease. According to Dr. Laurent-Puig, this might be due to the cascade of molecular interactions that occur after epidermal growth factor meets its receptor, EGFR. The KRAS enzyme is a key ...

Scientists unveil piece of HIV protein that may be key to AIDS vaccine development

...nstantly mutating virus, this protein component is stable and—more importantly, say the researchers—appears ...hout requiring a shape change in gp120 to create a stable bond between the two molecules. Essentially, the scientists found that the initial point of CD4 cont...

Researchers from the UGR use a bacterium to obtain biopreservatives from food

... which have a beginning and an end." AS-48 is very stable with respect to pH and temperature and has a broad action spectrum against numerous bacteria, including pathogenic bacteria transmitted by food, "which makes it a suitable molecule to use as a biopreservative." The research carried out at the UGR ...

20-year study shows significant rise in childhood obesity, especially among girls

...The percentage with a BMI of more than 30 remained stable at one per cent. "Children living in Sweden tend to be more active than children in other countries such as the USA. But they spend more time in front of televisions and computers and tend to do less physical education at school than before" says...

Stability of mRNA/DNA and DNA/DNA duplexes modulates mRNA transcription

...chers found that genes of these organisms are more stable than intergenic regions near their 3?end. In addit...on-coding regions in genes) are significantly less stable than exons (coding sequences in genes), suggesting that stable sense duplexes are characteristic of ...

Scientists find method to pick noncompetitive animals, improve production

...al species. "This is important because the most stable ecosystems are those that have multiple species that cohabitate. Natural selection is nature's way of keeping the ecosystem in balance." Muir previously proved that animals living in groups and bred to be more passive sustain fewer injuries and ar...

Scientists use nanoparticle to discover disease-causing proteins

...stroyed." The dendrimers would carry one of the stable isotopic 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...

How badger culling creates conditions for spread of bovine TB

A stable social structure may help control the spread of bovine tuberculosis (TB) among badgers, ecologists have found. The findings ?published online in the British Ecological Society's Journal of Animal Ecology ?have important implications for the role of b...

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