Tag: "origin" at biology news

Newly-discovered class of genes determines ?and restricts ?stem cell fate

...ay also be important for understanding the cell of origin for a number of tumors. Pax3 is known to be involv... some tumors, which adds evidence to the stem-cell origin for some cancers. This theory proposes that many cancers may arise from normally scarce resident ste...

Ecological destruction fuels emerging diseases

...tion, and species have moved out of their areas of origin into other areas, there have been emerging diseases. Parasites have moved into new areas and they've jumped ship into new hosts." He will present his latest findings on February 21 as part of a panel discussion on environmental systematics at the 20...

Bacteria collection sheds light on urinary tract infections

... multidrug-resistant bacteria could have an animal origin has major public health implications because of the practice of administering subtherapeutic doses of antibiotics as growth promoters in animals. E.coli is common bacteria found in humans and animals. Thousands of E.coli live in the organs of humans...

Bound for destruction: Ubiquitination protects against improper Notch signaling

...d4 interacts with Notch and pinpointed the site of origin for thisinteraction at the cell membrane, a finding congruent with the idea ofNedd4 as an agent of endocytosis. Nedd4’s role as a suppressor of Notchwas illustrated even more plainly when the lab showed that inhibitionof Nedd4 results in the upregula...

Found: Missing sequence of the human Y chromosome

...or onthe paper ?tested 100 men of different ethnic origin for the presenceof this 554-kilobase fragment. Indeed, the sequence was present in all100 individuals tested, but not in any female controls, confirming thatthis sequence was a fundamental part of the Y chromosome.More surprising, however, was Rappol...

New Clues Add 40,000 Years to Age of Human Species

...ave been a key element in arguments for an ancient origin of modern humans in Africa, yet one for which the age and provenance of the fossils was repeatedly contested,?notes Fleagle. At the request of their Ethiopian colleague Zelalem Assefa, now at the National Museum of Natural History in Washington, D.C...

BRCA1 causes ovarian cancer through indirect, biochemical route

...orts a theory we have formulated about the site of origin of ovarian cancers." ...

Development of portable infectious disease detector

...lications is one of the thingsthat we do best."The origin of the collaboration is an example of the power ofserendipity. It started when David Schaffer, a VIIBRE student whostayed on at the institute as a project engineer after he graduated,was browsing the Web looking for a permanent job. Although looking ...

Scientists identify new model Of NK cell development

...s, they had a hunch traditional thinking about the origin of human NK cells might be wrong. In building a case to support their beliefs, they first identified the NK precursor cell, then, they measured the number of the precursors in different parts of the body. Through flow cytometry, they discovered that...

Yale researchers identify molecule for detecting parasitic infection in humans

...on. But parasites, like humans, are eukaryotic in origin and how the body detects them has been a mystery. The common parasite Toxoplasma gondii (T. gondii) causing toxoplasmosis, has a complicated life cycle in which it is transmitted from mice to cats and then to humans. Previous research had shown that...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...ve gone to sea but don't return to their stream of origin to spawn, instead straying to some other waterway. The process of straying is entirely mysterious, Quinn says. Do strays identify the home stream but then go elsewhere? Do they have poorer memory or sensory capabilities and so stray out of ignorance...

Human Eggs Can Develop From Ovarian Surface Cells In Vitro

...d cast doubt on the established dogma on the fetal origin of eggs in adult human ovaries. It is now well established that fetal mammalian eggs originate from somatic stem cells. More recent research of adult human ovaries has shown that oocytes and granulosa cells (the layer of small cells that form the wa...

A hope for oil spill bioremediation

...ey used stable isotopes (13C/12C) to determine the origin of dissolved inorganic carbon (DIC) in control and contaminated coastal marine water samples. Due to its biological origin, crude oil is very depleted in 13C. Therefore, its biodegradation product CO2 will also be more 13C depleted as compared with t...

Venom doc tracks down snake bioweapons

... conducted the first comprehensive analysis of the origin and evolution of one of nature's most sophisticate...cientists, but the evolutionary history ?or tissue origin ?of these proteins has not been documented. In his March 2005 Genome Research article, Fry, the Dep...

Leprosy genome tells story of human migrations, French researchers report in Science

...y a single source of the bacterium that was at the origin of this global pandemic," Cole said. Each of the four SNP combinations was most common in a certain geographic region, allowing the researchers to trace how the pathogen had spread from its original source. ...

Chronic Sinus Infection Thought To Be Tissue Issue, Mayo Clinic Scientists Show It's Snot

... against what has been thought worldwide about the origin of chronic sinus infection: that inflammatory cells break down, releasing toxic proteins into the diseased airway tissue," says lead researcher and Mayo Clinic ear, nose and throat specialist Jens Ponikau, M.D. "Instead we found that these toxic prot...

Fungus-farming termites descend from an African rain forest Eve

...uctions of termite relationships. The rain forest origin of fungus-growing termites is remarkable, as extan...estingly, those results have some parallels to the origin and subsequent evolution of human agriculture. Human agriculture is also believed to have originated...

Deep sea algae connect ancient climate, carbon dioxide and vegetation

...l, between 33 - 25 million years ago, prompted the origin of economically important land plants that are sensitive to atmospheric carbon dioxide levels, such as corn and sugarcane. "The onset and stabilization of ice sheets at the same time as a decline in carbon dioxide illustrates the importance of atmos...

New Vaccine To Be Used For First Time In Polio Outbreak Response

... investigation is ongoing to determine the precise origin of the outbreak. Experts fear that the number of cases will rise in the immediate future. Teams of WHO and Ministry of Health epidemiologists and paediatricians remain on the ground, to investigate and control the outbreak and to intensify the plann...

Invasive parasite destroying fish species

...l, between 33 - 25 million years ago, prompted the origin of economically important land plants that are sensitive to atmospheric carbon dioxide levels, such as corn and sugarcane. "The onset and stabilization of ice sheets at the same time as a decline in carbon dioxide illustrates the importance of atmos...

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