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Tag: "trace" at biology news

Old memory traces in brain may trigger chronic pain

...source of chronic pain appears to be an old memory trace that essentially gets stuck in the prefrontal cortex, the site of emotion and learning. The brain seems to remember the injury as if it were fresh and can’t forget it. With new understanding of the pain source, Vania Apkarian, professo...

Potent possibilities for parasite attack

...nly five genes in the L. major genome for which no trace could be found in the other two species. By contrast, in Plasmodium, which causes malaria, about 20% of genes differ between related species. "Clearly there must have been considerable evolutionary pressure over time to maintain the structure and ...

Ice Age extinction claimed highly carnivorous Alaskan wolves

...ed type of wolf appears to have vanished without a trace some 12,000 years ago. The study, which will be...s multifaceted approach allowed the researchers to trace the ancient wolves’ genetic relationships with modern-day wolves, as well as understand their role i...

Remote sheep population resists genetic drift

...nd 600. Coltman and his colleagues were able to trace the DNA of the original Haute Island mouflon coupl...ere has ever been one in which you've been able to trace the DNA of the original, founding couple." ...

Elucidation of the genome for diabetics with DNA chips

...n-secreting beta cells of the pancreas. Zinc is a trace element present in very small amounts in the body, but essential for survival. Zinc deficiency is common in developing countries and has been associated with many diseases, including dabetes. These four genes may account for up to 70% of the here...

Tracing broken wiring in stroke patients

Researchers have used a technique to trace the functional disruption in brain circuitry that causes stroke patients to show a lack of awareness or response to the side of the body opposite to the side of the stroke lesion in the brain. The researchers said their findings shed new light on the...

Bioluminescence at the service of a novel cerebral imaging technique

...to follow neuronal activity in neurons, or even to trace it in a network of neurons. Furthermore, this little-invasive and non-toxic approach allows the recording of neuronal activity over periods of several hours. It is thus possible to monitor the cerebral activity of a Drosophila fruit fly for 24 or e...

World's largest flower evolved from family of much tinier blooms

...se rafflesia lacks the genes most commonly used to trace plant ancestry, the scientists delved deeper into the genome, looking at some 11,500 base pairs of DNA to determine that the giant flower's closest relatives are in the Euphorbiaceae family, many of which have blossoms just a few millimeters in diame...

OHSU lab finds meth receptor that could lead to therapy

...hetamine, is a G protein-coupled receptor known as trace amine-associated receptor 1, or TAAR1 for short. "The Program in Chemical Biology at OHSU is one of the few in the U.S. that allows biologists and chemists to work side-by-side, using their combined skills to identify drug targets and to design n...

Stem cell transplants explored at Stanford as a possible treatment for hearing loss

...r of otolaryngology, whose accent still bears the trace of his native Germany. "I tell them the devil is in the details." But even at the national level, those in the research community remain hopeful that Heller's work will reap successes sooner rather than later. Heller will discuss his stem cell r...

'Ancestral eve' was mother of all tooth decay

...r biomarkers that scientists have also employed to trace human evolution back to a single common African an...lled coevolution." "It is relatively easy to trace the evolution of S. mutans, since it reproduces through simple cell division," says Caufield, who ga...

Baby fish 'smell their way home'

...tive seemed to be that they could smell the unique trace of their home reef ?rather like salmon can smell the home river. "We know these late stage fish larvae, generally between about 9 and 14mm long, already have developed noses ?but the question was whether they could use them to recognise what the h...

Cholera pathogen reveals how bacteria generate energy to live

... study, according to Barquera. Sodium is easier to trace and its concentration can be changed without affecting pH, which is a complication with protons. "It’s a very good system to understand this very basic mechanism charging this battery to create energy," she said. In order to learn how the enzyme w...

Does evolution select for faster evolvers?

...m HGT insertions," Deem said. "For example, we can trace the development of the adaptive immune system in humans and other jointed vertebrates to an HGT insertion about 400 million years ago." The new mathematical model developed by Deem and visiting professor Jeong-Man Park attempts to find out how HGT...

Unique tomatoes tops in disease-fighting antioxidants

...abundant isomer in these tomatoes, they do contain trace amounts of trans-lycopene. The participants' bodies also readily absorbed beta carotene from the beta carotene-rich tomatoes. "Right now, only carrots and sweet potatoes are a more readily available, richer source of beta carotene," Schwartz sa...

ASU researchers test antibacterial effects of healing clays

...structures are almost identical, but the different trace element chemistry of the interlayer records an older geologic condition, from a time when the antimicrobial property was likely inherited." Crystal structure, the interlayer, the way other materials, metals, ions bind to clays, the absorptive char...

Tracing the formation of long-term memory

...gy at BCM. "This appears to be an authentic memory trace for long-term memory." Davis and his colleagues used spaced training to teach the flies to associate an odor with a mild electric shock. This method gives the fly a training trial, then a rest and then another trial. The rest is critical in induci...

Few clues about African ancestry to be found in mitochondrial DNA

...rowing interest in the use of mitochondrial DNA to trace maternal ancestries, and several companies now offer to analyse individuals' mitochondrial DNA sequences to obtain information about their origins. The current study suggests that only one in nine African Americans may be able to find clues about whe...

Leading reason for corneal transplants comes into focus

...latively large numbers of affected individuals and trace genetic traits co-inherited or "linked" with the disorder. Researchers search for a common location for all the linked traits until they wind up with a single chromosome address. In his latest study, Gottsch used not only linkage analysis but als...

Spelling out cancer on the nanoscale

...d proteins called oncoproteins. Being able to read trace oncoprotein levels from early-stage tumors would speak volumes to physicians and cancer researchers. Enter nano-fluidics and the art of reading a lot from very little. Researchers led by Dean Felsher at Stanford University School of Medicine, and b...

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