Tag: "evolution" at biology news

Hepatitis C's interferon resistance mechanism discovered

...their genes into thecell's genome. That means that evolution occurs all the time in viruses. "Just look at HCV," he continued. "It's developed a very clever strategy tocounteract interferon."...

When is a pollinator not a pollinator? Tales from an insect crime scene...

... will elucidate the effect of florallarceny on the evolution of floral traits."...

Mobile DNA sequences could be the cause of chromosomal mutations during the evolution of species

...omalchanges that have taken place in the course of evolution of all livingorganisms, suggest that transposable ...sponsible ofcromosomic changes associated with the evolution of species....

Computers use Darwinian model to 'evolve' fuel additives

...demonstrated how a computerized system that mimics evolution candiscover new gasoline additives for better engine performance. The engineers developed "genetic" algorithms -- or computer instructions --that adapt Charles Darwin's evolutionary model to combine and recombine chemicalcomponents until the "fit...

Fly vs. fly

...Price and Jerry Coyne, PhD, professor of ecology & evolution at theUniversity of Chicago and an author of the paper, concentrated on mechanisms themale uses for ensuring paternity, focusing on the apparent displacement andincapacitation of stored sperm by the ejaculate of later-mating males. The resear...

Biology, engineering jointly train students in neuro-mechanics

...nd biomechanics of movement behavior, biorobotics, evolution and analysis of model neuro-mechanical systems, and motor system neuroprostheses. "Our goal is not to generate students who are jacks of all trades, but rather specialists who are capable of working in teams with other specialists," says Ritzmann. ...

Team of 200 scientists presents new research that reveals full 'tree of life' for plants

... only in thedistant past.Instead, at each stage of evolution only one family or lineage of green plantsseems to have left the oceans and survived on land. Even at the very root of thegreen plant family tree, only one line leads to today's living green plants,according to Mishler. "Plants came out onto land pro...

Plants, pathogens engage in trench warfare

...e. Joy Bergelson, assistant professor of ecology & evolution at the University ofChicago, favors an alternative...theory has been a generally accepted model for the evolution ofdisease resistance genes because it is intuitive, but its never beenscientifically tested" says Be...

Single switch triggers two immune system genes

...e 450 million yearssince the genes first appeared, evolution has required them to remain closelyspaced in the g...of simultaneous activation might betterexplain why evolution has refused to allow the two genes to separate and stillremain functional partners in the transposas...

Computers have had dramatic impact on chemistry

... Computers in Chemistry. Dessy will talk about the evolution of computer use in the initial stages ofresearch -- to record a scientist's notes and data, for 'mining' information ininstitutional databases, and for large scale testing of compounds during theadvanced stages of new drug discovery. He will also exp...

Harvard expert speaks on lead toxicity to chemists' meeting in New Orleans

...he rateand specificity of enzyme catalysis and the evolution of protein function. He isa Fellow of the Royal Society of London, the American Academy of Arts andSciences, the American Philosophical Society, and a Foreign Associate of theNational Academy of Sciences. He is also trustee of the Howard Hughes Medic...

Primate genus sheds light on great ape and human origins, as reported in Science

...uced a wealth of information about climate and the evolution of other animalspecies from this time period. Ward, Hill, and members of the team from the National Museums of Kenya came uponthe Kipsaramon skeleton after searching uphill from a large number of isolatedteeth that had washed into a gully at the sit...

Ancient viruses lurking in polar ice

...ved ones and others that have taken a holiday from evolution in coldstorage. "Perhaps they are actually ancient populations that have been recycledover and over again," he says. "How can you do evolutionary studies if that'strue?" The New York team plans to use other techniques to find out if virusesin...

Scientists create smart mouse

...omenon of declining memoryhas persisted throughout evolution and has been observed in species ranging fromsongbirds to primates. In his experiments, Tsien not only gave mice extra copies of the NR2B gene, heset up the extra copies so that their activity increases as the mice age,counteracting the decline of t...

USGS studies wildfire ecology in the western United States

...lifornia, fire has been a strong force guiding the evolution of local plant life, and a constant regulator of ecological communities. In many desert habitats, on the other hand, fires have been far less frequent, but represent a more severe disturbance when they do occur. Scientists and managers increasin...

Researchers pinpoint chemical signal that speeds mating process

...associate professor in the department of ecology & evolution atthe University of Chicago. "It alone can significantly shorten the time that apair spends in courtship." The protein, called plethodontid receptivity factor (PRF), is part of acomplex mixture of chemicals that the male salamander uses to ...

Wistar scientists find striking similarities between bacterial virus and human adenovirus

... details of this research appear the paper, "Viral evolution revealed byPRD1 and human adenovirus coat protein structures," published in the September17, 1999 issue of the scientific journal, Cell. Resemblances between these two double-stranded DNA viruses, which infect verydifferent hosts, suggest an evolutio...

Capture the flag: 'Darwin fish' may be a new version of a very old game, University of Georgia study proposes

ATHENS, Ga. -- The Scopes Trial on evolution never really ended. It just wound onup the bumpers...atement of public belief. But for those who accept evolution bynatural selection, the fish symbol was a golden opportunity for parody, and soonDarwin fish, with ...

Common parasite overturns traditional beliefs about the evolution and role of hemoglobin

DURHAM, N.C. -- Science's understanding of the evolution and role ofhemoglobin, considered one of the most ...In Ascaris, at the evolutionary divide, we see the evolution ofthe 'functional switch' -- respiratory function (control of oxygen) and thedetoxification function...

Pollution makes crustaceans adapt rapidly

...ichment of a lake -- can be influenced by therapid evolution of the animals that are affected," says Hairston, ...nstitute, documented the crustaceans'express-style evolution by hatching a series of dormant Daphnia eggs thatwere found, level by level, in lake-bottom sedime...

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