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Tag: "force" at biology news

Can't serve an ace? Could be muscle fatigue

...amount of effort required to lift them against the force of gravity," Professor Proske said. "Take gravity away, as happens to astronauts, and they have real trouble carrying out skilled movements. "In our experiments we found that when the muscles in one arm were fatigued, the effort required to maintain...

Researchers Discover That Microbes Can Produce Miniature Electrical Wires

...Kevin D. McCarthy to probe the pili with an atomic force microscope. They found the pili were highly conductive. Furthermore, when Geobacter was genetically modified to prevent it from producing pili, Geobacter could no longer transfer electrons. “These results help us understand how Geobacter can live in...

Evolution of taste receptor may have shaped human sensitivity to toxic compounds

... perception and on the role of diet as a selective force in human evolution. ...

A whole lot of shaking goin' on triggers early hatching in red-eyed tree frogs

...y reptile but not when buffeted by another outside force such as rain, is a question that has now been answered in part by Boston University researcher Karen Warkentin. According to her findings, reported in an upcoming issue of Animal Behaviour, it's a particular characteristic of the vibrations that shak...

Census of Marine Life explorers surprised by diversity, density of Arctic creatures

...fied the Antarctic Circumpolar Current, a powerful force flowing from west to east moving 145 million cubic meters of water per second, more than the combined flow of all world rivers. Piecing together the history of marine evolution Because they now understand the physical churn that goes on in the Sout...

Active Vaccine Prevents Mice From Developing Prion Disease

...takes hold, prion proteins invade brain tissue and force normal proteins to adopt their configuration. In time, the diseased animal develops dementia, loses control of its limbs, and eventually dies. There are no treatments for prion-related diseases, and prions can easily infect the body because they do ...

U.N. mulls the protection of Earth's forests

...ement. There are many environmental conventions in force that do not deliver what they promise. A better alternative is to link forests to other sustainable development goals that include the environment, health, nutrition and energy. Forests need to be integrated into these other interests and solutions."...

Engineers improve plastic's potential for use in implants by linking it to biological material

...ched copies of the peptide to the tip of an atomic force microscope at the university's Center for Nano- and Molecular Science and Technology. The tip of this specialized microscope is normally passed across the surface of a material to "map" its peaks and valleys. In this case, the surface was a layer of ...

At the molecular level, the predator is the prey

...change the snake's sodium channel. Add more toxin, force further changes in the channel." ...

Gov't Creates Gene Database of Normal Human Tissues

...cells of previously incurable cancers. The driving force of research in our section is to translate genomic information to the clinic. The goal is to save lives and improve the quality of life for children with high-risk cancer." Until now, no publicly available, normal human organ database has used so ma...

To Stop Evolution: New Way Of Fighting Antibiotic Resistance Demonstrated By Scripps Scientists

...ntists have more often understood evolution as the force that drives genes. What underlies evolution is mutation -- changes in the DNA. "Mutations are the fuel for evolution," says Romesberg. Because of the potential harm of mutations, humans and other mammals have evolved to make as few as possible. The ...

Distributed Basic Local Alignment Search Toolkit (W.ND-BLAST)

...nd showerheads where they thrive and multiply. The force of water passing through the pipes or tap can break off fragments of the biofilm transferring it to different parts of the water distribution system and seeding formation of new biofilm colonies. When water enters a hospital room from a faucet or sh...

New strategies to reduce hospital-aquired infections

...nd showerheads where they thrive and multiply. The force of water passing through the pipes or tap can break off fragments of the biofilm transferring it to different parts of the water distribution system and seeding formation of new biofilm colonies. When water enters a hospital room from a faucet or sh...

Unchecked DNA replication drives earliest steps toward cancer

...er DNA damage. In some circumstances, p53 may even force the cell into apoptosis, or programmed death, as a way to protect against the cell developing into a tumor. If the mutations occur in p53 itself, however, or the p53 pathway is unable to completely halt the process, further mutations will occur, lea...

Researchers develop assay that could be applied to drug screening

...ells both as a structural element, and to generate force through polymerization. "The role played by actin in clathrin mediated endocytosis has been controversial for a long time," Zenisek said. "We've now shown in live cells that proteins involved in actin polymerization are recruited to sites of membran...

Basis for DNA ejection from single phage particles

..., researchers have gained insight into the driving force behind this poorly understood injection process, w...resent 50 times that of the bacterium. The driving force for DNA transport is still poorly defined. It was hypothesized that the internal pressure built duri...

Disease progression model of pancreatic cancer developed by Penn researchers

... pancreatic cancer, and is thought to be a driving force in the transition from local tumor growth to metastases of cancers. According to Hingorani, "This model may prove useful to understanding human pancreatic and other epithelial cancers because the key event of genomic instability that has been very di...

NIAID begins clinical trial of West Nile virus vaccine

...third approximately four weeks after that. To help force the DNA plasmid into muscle cells, the vaccine will be administered by a needle-free injector rather than a conventional needle syringe. Volunteers will be monitored for possible symptoms or side effects as well as the body's ability to generate WNV-...

Brain-mapping technique aids understanding of sleep, wakefulness

...tively and objectively that there is a very strong force regulating sleep, but there is very little knowledge about the actual biological mechanism controlling sleep," said Dr. Masashi Yanagisawa, professor of molecular genetics at UT Southwestern and senior author of the study. "Eventually my dream is to ...

Cricket's finicky mating behavior boosts biodiversity

... Finicky mating behavior appears to be the driving force behind the speedy speciation of the Laupala cricket, the scientists wrote in the Jan. 27 issue of Nature magazine. Females in the Laupala genus detect tiny differences in the pulse rates of male courtship songs, which differ from one Laupala species...

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