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Tag: "various" at biology news

Out of Africa -- Bacteria, as well

...acteria populations, just as it did in that of the various peoples of the world. This has also given scientists new insight into the paths taken by man as he journeyed across the Earth (Nature online, February 7, 2007). More than half of all human beings are infected with Helicobacter pylori, a bacterium...

Map predicting spread of avian flu

...ify high-risk areas in the Netherlands and analyze various control strategies, concluding that in these regions an epidemic can only be brought to an end by massive culling of susceptible farms. For avian influenza, the analyses show that there are two poultry-dense areas in The Netherlands where epidemic s...

Applied scientists create wrinkled 'skin' on polymers

... "We are approaching this field of research from various directions," says Vaziri. "At the moment we are looking at the effect of ion beam energy and have been able to reduce the wavelength of the wrinkles to 50 nanometers. Manipulation at such a small scale makes this method even more attractive. We are a...

Mosquito repellents that emit high-pitched sounds don't prevent bites

...ated ten field trials that had been carried out in various parts of the world. None of these trials showed any evidence that EMRs work. "All ten studies found that there was no difference in the number of mosquitoes found on the bare body parts of the human participants with or without an EMR," says lead ...

Stem cells decrease ischemic injury and restore brain function

... shown that these cells can be effective, although various issues about their use and the mechanisms of their protective action remained unsolved," says Maria Grazia De Simoni. "Our research has underlined a possible mechanism of action. Once introduced in the area of the brain hit by a stroke, stem cell...

Some caterpillers just don't want to grow up

...estigate this problem. Together they have compiled various potential adaptive explanations for the evolution of such strategies into a general and quantitative model. "The problem was not the lack of, but multitude of alternative mechanisms principally capable to explain the evolution of delayed development,...

Nanotechnology shows promise as next wrinkle fighter

...llaborators, is testing polymer films, by applying various cells and proteins to see if there are toxic reactions. ...

Scientists perform 'tricky' operation

...rge families of genes related to those involved in various mechanisms of antimicrobial resistance. As a result of the genome being sequenced, she has since been able to localise specific genes of interest to the whole chromosome and begin the mapping process. "Mapping the genome is the next step in the...

Mosquito genes explain response to climate change

.... There are three billion base pairs in humans. As various genome maps are being completed, scientists now face the task of determining how genes interact and how they produce specific phenotypes (observable traits), which include photoperiodic response and dormancy. "Climate changes already are extendin...

Prehistoric mystery organism verified as giant fungus

...entists later argued that it was instead a lichen, various types of algae or a fungus. Whatever it was, it stood in tree-like trunks more than 20 feet tall, making it the largest-known organism on land in its day. "No matter what argument you put forth, people say, well, that’s crazy. That doesn’t make an...

Bumblebee house warming -- it takes a village

... the temperature became too hot. Performance of various in-nest tasks is not interchangeable among these social insects. Instead, the researchers found strong evidence for job specialization, even when a colony was artificially forced to step up its rate of incubation, according to Sean O'Donnell, a UW as...

Bacteria research offers hope for new vaccine against meningococci

...to rapidly and effectively monitor the function of various vaccine candidates and new drugs, obviating the numerous costly and time-consuming tests that have been necessary until now. At the same time, the system provides a clear picture of the process of infection. “With these findings as tools, we can ...

Cells use 'noise' to make cell-fate decisions

...ll still be slight variations in the amount of the various proteins those genes produce, some fluctuation in the amount of each circuit component. No two cells are alike in terms of their chemical composition." Conventional scientific thinking has been that the random nature of such fluctuations within ce...

Scientists produce neurons from human skin

...y procedures. They subjected these skin samples to various treatments in order to extract neuron precursor cells, which they then proceeded to cultivate in vitro. Skin itself does not contain neurons, which are hosted in the spinal cord, but contains only their extensions, called "axons." The researchers?cha...

MicroRNA helps prevent tumors

... find out, Mayr created a series of Hmga2 in which various numbers of let-7 sites were destroyed. She found clear evidence that when exposed to let-7, the fewer sites that were intact, the more protein was produced. Next, she tested whether disrupting let-7's ability to repress Hmga2 would lead toward tu...

Over a century after disappearing, wild elk return to Ontario

... 460 elk were brought from Alberta and released in various Ontario sites between 1998 and 2001. "The Ontario elk restoration program has met with great success primarily due to the collaborative, multi-partnered approach to wildlife management," says Dr. Rick Rosatte, author of the report and senior researc...

Novel computed imaging technique uses blurry images to enhance view

... Marks said. "We are now applying the technique to various microscopy methods used in biological imaging." In their paper, the researchers demonstrate the usefulness of computed image reconstruction on both phantom tissue and on excised human breast-tumor tissue. "ISAM can assist doctors by providing fas...

New hereditary breast cancer gene discovered

...linic. The scientists are now going to perform various experiments to chart the mechanism of how TWIST1 increases the risk of breast cancer. Studies are also under way to find out what proportion of cases of hereditary breast cancer are caused by mutations in the TWIST1 gene. ...

Research to spotlight carbon monoxide benefits

... be seen in the healing process of a bruise, where various colour changes indicate the degradation of haemoglobin and release of carbon monoxide. The slow release of carbon monoxide reduces blood pressure for someone who has angina, for instance. "This work is very much in its infancy. We became involved ...

National Academies advisory: Invasive aquatic species in the Great Lakes

...rt will comment on the strengths and weaknesses of various options and recommend those that seem most promising. DETAILS: 9 a.m. to 5:30 p.m. on May 7 at the Marriott Toronto Downtown Eaton Centre, 525 Bay St., Toronto. More information is available online at http://www8.nationalacademies.org/cp/meetin...

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