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Tag: "isolation" at biology news

Ancient DNA traces the woolly mammoth's disappearance

...tic groups, implying that mammoths had diverged in isolation for some time before merging back into a single population. The DNA further suggests that no later than forty thousand years ago, one of the groups died out, leaving only the second alive at the time of the mammoth’s last gasp. “At a time when we ...

Climate change was the cause of Neanderthal extinction in the Iberian Peninsula

...e Gibraltar Museum ?according to which Neanderthal isolation and, possibly, extinction were due to environmental factors. ...

Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems

...f islands had found that islands?limited areas and isolation can reduce predation and competition pressures. As a result, island animals were able to reach exceptionally high densities. In their study, Jetz and Buckley confirmed that reduced numbers of predators and competitors accompany high lizard densit...

Scientists discover new, readily available source of stem cells

...ls in the laboratory. The first report showing the isolation of broad potential stem cells from the amniotic fluid that surrounds developing embryos was published today in Nature Biotechnology. "Our hope is that these cells will provide a valuable resource for tissue repair and for engineered organs as well,"...

Large size crucial for Amazon forest reserves

...use it weights the relative importance of area and isolation in the design of forest reserves. The team, hea...of vast undisturbed forest." The question is, does isolation aggravate this pervasive effect of size. It does for many species, but surprisingly not for many oth...

Out of Africa -- Bacteria, as well

...ulations, the scientists employed the principle of isolation by distance. According to this principle, the genetic distance between two populations has a linear correlation with the length of the migration paths taken since they were separated. "It's actually quite logical," explains Dr. Mark Achtman, "because...

Stem cell identity in culture may strongly depend on the cellular microenvironment

Identification, isolation and large scale culture of stem cells for potential medical applications is a major challenge in cell biology. In an upcoming PLoS ONE paper, researchers, including Andras Paldi, in Genethon (Evry, France) report, on the basis of experimental observa...

Opening windows may be the best way of preventing transmission of airborne infection

...ally ventilated clinical rooms such as respiratory isolation rooms, TB wards, respiratory wards, general medica...hanically ventilated negative-pressure respiratory isolation rooms built after 2000. Even at the lowest of wind speeds, natural ventilation exceeded mechanic...

Does a peptide affect the heart's response to social isolation?

...animals were subsequently exposed to either social isolation or pairing with a female sibling (control conditio... during the third and fourth week of the four-week isolation period. Electrocardiographic parameters (heart rate and heart rhythms) were recorded using the r...

'The eyes have it' -- Autism research yields surprising results

...reting mental states, whether they saw the eyes in isolation or in the context of the whole face. This indicates that autistic children do, in fact, make use of information from the eyes ?a finding that contradicts prior studies. An estimated 588,000 people have autism in the UK, according to the National A...

'GreeneChip' -- New diagnostic tool that rapidly and accurately identifies multiple pathogens

...s for treatment of VHF are limited; however, rapid isolation if infected persons is critical to curb contagion. In contrast, human-to-human transmission is not a primary concern with malaria and early, specific therapy can have a profound effect on illness and death. The GreeneChip provides unprecedented opp...

Unraveling where chimp and human brains diverge

...ose in the chimpanzee. "Genes don't operate in isolation ?each functions within a system of related genes," said first author Michael Oldham, UCLA genetics researcher. "If we examined each gene individually, it would be similar to reading every fifth word in a paragraph ?you don't get to see how each word...

Flu shot effective against drifted influenza, nasal spray vaccine less so

...encing flu symptoms and analyzed them, using virus isolation and PCR techniques, to determine if influenza virus was causing the illness. Monto and Ohmit suspect that the adult participants in their study in 2004-05 had enough prior experience with influenza that the live attenuated virus may have failed to ...

How many genes does it take to learn? Lessons from sea slugs

...rogression of brain disorders do not take place in isolation - large clusters of genes within an untold amount of cells contribute to major neural events. "For the first time we provide a genomic dissection of the memory-forming network," said Leonid Moroz, a professor of neuroscience and zoology at the Un...

Embryos exposed in 3-D

...transformative filtration-based technology for the isolation and enrichment of cells, a critical first step in ...tem, density gradient, centrifuge-based method for isolation of mononuclear cells (MNC) from whole blood. The Pall Filter Harvest System was found to significan...

New technology enables faster, more efficient cell harvest: Cell therapy meeting study

...transformative filtration-based technology for the isolation and enrichment of cells, a critical first step in ...tem, density gradient, centrifuge-based method for isolation of mononuclear cells (MNC) from whole blood. The Pall Filter Harvest System was found to significan...

Prevention is the best option: fighting autoimmune diseases

...f Fazekas. The highly accurate identification and isolation of regulatory T cells was made possible using sophisticated flow cytometry equipment at the Centenary Institute. The machines use laser beams and advanced optics and electronics toanalyse and purify many kinds of cells at a rate of over 25,000 cells...

Viral genetic differences are possible key to HIV dementia

...ch means that the virus is replicating in relative isolation in these tissues, with very little exchange of genetic information between the two populations." The researchers also analyzed the sequences in search of a "genetic signature" common to the CNS-specific viruses in all 18 individuals, recounts Pilla...

Innocuous intestinal bacteria may be reservoir for resistance

...as no association found between antibiotic use and isolation of multi-drug resistant Salmonella. Where does th...ella strains found on the same farm. In addition, isolation of antibiotic-resistant Salmonella appears to be associated with whether or not commensal bacteria c...

Neuronal cell cultures kept on the straight and narrow

...nal cells. Culturing particular types of cells in isolation is a basic technique for measuring how they respon...cs technique to culture neuronal cells in relative isolation on a variety of cell-culture surfaces, and to pattern the cells on the surface to study the effects ...

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