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Tag: "origin" at biology news

Common mechanisms for viral DNA replication

...equences required to start replication, called the origin of replication. SV40 T-ag can also cause DNA to me...SV40 T-ag on a DNA fragment derived from the viral origin of replication. The structure shows that although T-ag and its functionally analogous protein, papi...

No sex for 40 million years? No problem

...gent selection', a process well known to cause the origin of species in sexual organisms. Dr Barraclough adds: "These really are amazing creatures, whose very existence calls into question scientific understanding, because it is generally thought that asexual creatures die out quickly, but these have be...

Nanotechnology shows promise as next wrinkle fighter

... films to smooth out the tiny buckles that are the origin of wrinkles. While the article addresses breakthroughs in the buckling of polymer films as they were compressed or heated during the manufacturing process, Ilsoon said the principles show promise to apply to human skin. The research is supported...

Out of Africa -- Bacteria, as well

...ity declined the further they journeyed from their origin in East Africa. Scientists have now uncovered similar signs of historical population migration in the genetic makeup of H. pylori. However, the genetic diversity of the bacteria is larger than that of man. This paves the way for researchers to use...

Hofmeyr skull supports the 'Out of Africa' theory

...that has raged for years concerns the evolutionary origin of modern people. A number of genetic studies (esp...nerally on nuclear DNA) argue against this African origin and exodus model. Instead, they suggest that archaic non-African groups, such as the Neandertals, ma...

Researchers develop technique for bacteria crowd control

... provide strong evidence for the pure hydrodynamic origin of collective swimming, rather than chemotactic mechanisms of pattern formation when microorganisms just follow gradients of a certain chemical, such as nutrient, Oxygen, or other" ...

Paleontologists discover new mammal from Mesozoic Era

...w fossil offers a rare insight in the evolutionary origin of the mammalian ear structure," said Zhe-Xi Luo, a paleontologist at the Carnegie Museum of Natural History (CMNH) in Pittsburgh, Pa. "Evolution of the ear is important for understanding the origins of key mammalian adaptations." Mammals have hig...

Scientists learn the origin of rogue B cells

...mmunity. Our work provides one explanation for the origin of these self-reactive B cells." "If you understood the system extremely well and were able to delete the editing cells during development, for instance, then you would only have lymphocytes that don't express self-receptors at all," he says. F...

Imaging pinpoints brain regions that 'see the future'

...re not required to describe details or explain the origin of mental images elicited by the memory cues, but in post-testing questionnaires most indicated that they tended to place future-oriented images in the context of familiar places (e.g. home, school) and familiar people (e.g. family, friends), which w...

Study of protein folds offers insight into metabolic evolution

...rld, it makes a lot of sense that we've found this origin encased in nucleotide metabolism." ...

Latent memory of cells comes to life

...NA, either large or small. Such changes are at the origin of the immense and varied animal and plant life on..., such as skin, brain, or bones. Mechanisms at the origin of this so-called cellular differentiation are those for which researchers at the University of Cope...

Do fruit flies have free will?

... Oceanography at UC San Diego did they realize the origin of the fly's peculiar spontaneity. "We found that there must be an evolved function in the fly brain which leads to spontaneous variations in fly behavior" Sugihara said. "The results of our analysis indicate a mechanism which might be common to many...

Spud origin controversy solved

...w genetic information concerning the long-disputed origin of the “European potato.?Scientists from the Unive... originated from Chile,?said Spooner. “If the true origin of the European potato was from Chile, rather from the Andes, it shows the value of plant evolutiona...

Egyptians, not Greeks were true fathers of medicine

... "This may allow us to determine a likely point of origin for the plant while providing additional evidence for the trade routes, purposeful cultivation, trade centres or places of treatment," said Dr Metcalfe. "The work is inextricably linked to state-of-the-art chemical analyses used by my colleague Ju...

Gene mutation linked to cognition is found only in humans

...ing a multi-step process eventually leading to the origin of the type II form in human," the authors state. They note that further studies should probe the biological function of type II neuropsin in humans, as the extra 45 amino acids in this form may cause protein structural and functional changes. The...

Corals -- More complex than you?

... all living animals and can throw new light on the origin of such complex features as the nervous and immune systems of vertebrates. Around 10 or 12 per cent of the known coral genes are in fact shared uniquely with vertebrates ?these are genes that have been lost from all other animals so far examined. ...

The mouflons of the Kerguelen archipelago

... to obtain genetic material from the population of origin from the Vincennes Zoo. “We took the DNA from these samples, and looked at specific genetic sites,“ explained Renaud Kaeuffer. “We expected that the genetic diversity of this population of mouflons would be very homogeneous, and that this genetic div...

Surprising origin of cell's internal highways

... University Medical Center reveal a surprising new origin for these cellular "highways." In the June issue of Developmental Cell, Irina Kaverina, Ph.D., and colleagues report that the Golgi apparatus -- a stack of pancake-shaped compartments that sorts and ships proteins out to their cellular destinations -...

Rising skin cancer rates are more likely to affect wealthy people, says 12-year review

... to be affected by different skin tones and ethnic origin than research carried out in countries with a greater ethnic mix.” The authors point out that the general increase in incidences of skin cancer, coupled with ageing populations, will place greater demands on dermatology and other related specialti...

Caribbean frogs started with a single, ancient voyage on a raft from South America

...es of how the frogs arrived had predicted a single origin for Caribbean terrestrial frogs and because groups...dless of how they got there. "Discovering a single origin for all of these species from throughout the Caribbean islands was completely unexpected," Hedges sa...

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