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Tag: "introduced" at biology news

New sucker-footed bat discovered in Madagascar

...a plant that is endemic to Madagascar but has been introduced to numerous tropical countries. Myzopoda are found in association with such plants because they can use their suckers to climb and adhere to the leaves' flat, slick surface. They are presumed to roost in the leaves during the day. Myzopoda were co...

New technologies coming too fast for Indian farmers

...cally modified to produce its own insecticide, was introduced in India in 2002. Between 2003 and 2005, the market share of Bt seed ?created through collaboration between Monsanto Co. and several Indian companies ?rose to 62 percent from 12 percent. Stone's research reveals that the increase resulted not from tr...

Link found between immune system and high plasma lipid levels

...ride levels. When T cells expressing LIGHT were introduced into the mice, lipid levels rose, both when the mice were fed a regular diet, and also when fed a high-fat, high-cholesterol diet. However, if researchers blocked the LIGHT signaling, using an engineered protein (LTbR-Ig), lipid levels were lowered ...

New study challenges 'critical period' in childhood vision development

... students, Yuri Ostrovsky and Aaron Andalman, were introduced to a woman in India who was born blind due to dense congenital cataracts in both eyes. The woman lived as a blind child for 12 years before she received treatment. Now, twenty years after her surgery, the researchers found that she is able to disce...

When your brain talks, your muscles don't always listen

...f Connecticut, a class on the biology of the brain introduced him to the nervous system and movement, and he was hooked. His interests were further piqued during a summer research experience, where he had the opportunity to work with wheelchair athletes. "People with severe spinal cord injuries have limited ...

Imaging pinpoints brain regions that 'see the future'

...n such an event. The "Clinton-Imagine" task was introduced to help researchers establish a baseline level of brain activity for a cognitive event that was in many ways similar to the other two tasks but did not involve the mental projection of oneself through time. Bill Clinton was chosen because pre-testing...

Nanotextured implant materials: blending in, not fighting back

...ocess known as restenosis. Drug-coated stents were introduced years ago as one way to combat this problem, but concerns have surfaced recently about increased clotting. Instead of using chemistry to fight the body's response to such foreign materials, Thomas Webster, an associate professor of engineering, an...

Scientists find genes involved in the battle between Hessian flies and wheat

...s for more than 200 years, apparently accidentally introduced by German mercenaries during the Revolutionary War. The flies are found worldwide, but the U.S. infestation has been mainly in the Southeast. In Georgia during the 1980s, wheat crop losses totaled $28 million in one year when the insect overcame t...

Rapid response was crucial to containing the 1918 flu pandemic

...sures were put in place. Officials in St. Louis introduced a broad series of public health measures to contain the flu within two days of the first reported cases. Philadelphia, New Orleans and Boston all used similar interventions, but they took longer to implement them, and as a result, peak mortality rate...

In young mice, gregariousness seems to reside in the genes

...e time seeking out and interacting with other mice introduced into their environment. By controlling for a host of behavioral variables during the course of adolescent development, the researchers demonstrated specific differences in social motivations among juveniles of the two mouse strains - behavioral varia...

Role of noise in neurons

...omizes on space and energy, it increases the noise introduced by thermodynamic fluctuations in a neuron's voltage-gated ion channels. Axons use action potential (AP) to transmit information fast and reliably to synapses, but the reliability of transmissions down fibers of less than 0.5 ìm in diameter was unknow...

Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems

... have devastated island populations of lizards and introduced snakes have caused the loss of birds and lizards on islands. “Cases of species introductions wreaking havoc on islands are likely to become more common as the islands face increasing pressures from population growth, tourism, development, and cli...

Chronic fatigue syndrome impairs a person's slow wave activity during sleep

... only after a "challenge" to sleep regulation was introduced (keeping them awake an extra four hours) that the CFS twins exhibited significantly less SWA power in the first non-REM period of recovery sleep and accumulated a smaller percentage of SWA in the first non-REM period than their twin counterparts. ...

Modified mushrooms may yield human drugs

...l right into the mushroom cell, and integrates the introduced gene into the chromosome of the mushroom. Next, the researchers exposed the mushroom cells to hygromycin. The antibiotic kills all the normal cells, separating out those that have been genetically altered for resistance. The test demonstrates ...

The mouflons of the Kerguelen archipelago

...ehaviour of mammals (mouflons, sheep and reindeer) introduced into the Islands. Ten years later, Renaud Kaeuf...France, went to the Islands to study the impact of introduced cats on the bird populations. Noticing that the mouflon population appeared to be thriving, he sugge...

Marine phytoplankton changes form to protect itself from different predators

...ignals from the two predators were then separately introduced into Phaeocystis cultures that had not been attacked. The scientists then studied how the different chemical signals affected the percentage of Phaeocystis living in colonies or as solitary cells. Finally, they examined whether this response affect...

Herpes virus hijacks DNA repair process

...er environmental factors, or mistakes accidentally introduced when cells copy their genetic material prior to dividing. In the murine (or mouse-infecting) herpes virus they studied, researchers at Washington University School of Medicine in St. Louis identified a protein that can trick the mouse cell into tu...

New collaborative research reveals chimpanzees can sustain multiple-tradition cultures

...d Dr. Bonnie worked with two chimpanzee groups and introduced each to one of two alternative sequences of complex behaviors. The sequences included collecting, transporting and depositing a token into a bucket or a pipe to receive a food reward from a separate, unrelated location. After each group of chimpa...

Hormone helps mice 'hibernate,' survive starvation

...not normally active; however, when the researchers introduced FGF21 into these mice, the animals’ metabolism changed. “When mice were given this hormone, their metabolism appeared as if they were starved, even after they had just eaten,” said Dr. Kliewer. Because limiting food consumption is known to have...

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