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Tag: "reason" at biology news

HIV decline in Zimbabwe linked to behavioural change

...e London, and one of the researchers, said: "A key reason for this decline appears to be the reduction in the number of casual sexual relationships, although there was also a delay in the onset of sexual activity and increases in condom use prior to the time of the study may also have contributed". The stu...

HIV vaccine takes different tack to boosting immune response

...t Baylor College of Medicine (BCM) in Houston have reason to believe their unorthodox vaccine could one day help to prevent or control HIV infection, according to a study published in today's edition of Public Library of Science Medicine. The study in mice boosted the immune response by removing the host's...

Finding a virus is not all bad news

... will have closely related viruses. It is for that reason we can use the viruses to track the cats and learn about their recent history." Once the viruses have been sequenced the data, GPS readings and sample dates were entered into a computer programme, designed by Alexei. The software analysed the data ...

Efficiency, not more doctors, is the prescription for aging population

... assumption, according to the authors. Proponents reason that the practices of the highest-intensity medical centers where many more doctors and resources are used in providing medical services at the end of life, should be the standard for the country as a whole. "Instead of financing further growth in ou...

For the first time: Longevity modulated without disrupting life-sustaining function

... good day in a favorable environment, but for some reason DAF-2 signaling gets turned off precociously, the worms reap the benefit of increased stress resistance and double their lifespan from an average of 20 to 40 days. Except the worms trade a trim life focused on reproduction for a long life with fewer ...

How sperm crack the whip

...annels in human sperm are very similar, there's no reason to believe you couldn't develop a male or female birth control pill that would block the protein before it functions to hyperactivate sperm, preventing fertilization," he said. ...

Therapeutic prospects beyond Vioxx

...d to the risk of stomach problems, undermining the reason for choosing COX-2 inhibitors in the first place." A surprising finding came when the investigators turned to a drug target that might substitute for COX-2 ?an enzyme called microsomal prostaglandin E synthase (mPGES)-1. Other investigators had show...

Component in soy products causes reproductive problems in laboratory mice

...n translate to the human population, there is some reason to be cautious," said Dr. David A. Schwartz, Director of the National Institute of Environmental Health Sciences (NIEHS). "More clinical studies are needed to determine how exposure during critical windows of development can impact human health." G...

How can we protect patients with weakened immune systems from influenza?

...s this fall under the five-year program. "A major reason to study influenza is the quick-changing nature of the influenza virus," said Dr. Sullivan. The virus mutates its outer coating from year to year, a process called viral drift, which is why new flu vaccines are developed each year. The potential thre...

Deep-rooted plants have much greater impact on climate than experts thought

...hallow roots, though Dawson suspects that the real reason for keeping the surface soil moist is to make it easier for the plant to take in nutrients. "Hydraulic redistribution is definitely related to water, but it can't really be discussed outside the context of plant nutrition," he said. Dawson, Lee and...

Genomics-based vaccine could prevent deadly cattle disease

...ssful, Nene notes, the entire region will have new reason to hope for a better life. Evans Taracha, ILRI project leader, also highlights the importance of strategic research partnerships to overcome this and similar diseases. ...

Animal brains 'hard-wired' to recognize predator's foot movements, Queen's study suggests

The reason people can approach animals in the wild more easily from a car than by foot may be due to an innate "life detector" tuned to the visual movements of an approaching predator's feet, says Queen's University psychologist Niko Troje. "We believe this v...

Rare Chinese frogs communicate by means of ultrasonic sound

...ally. They have the ability to do so, but for some reason some frogs do and some don't, he said. "We believe that all of them have the capacity to respond to the ultrasound." Ultrasonic communication likely will be found in other amphibians and birds, Feng said, but, until now, no one has bothered to look ...

Salmonella caught red-handed

...lockade of several central metabolic pathways. The reason for this is redundant enzymes, as well as the host offering a wide range of nutrients, which means Salmonella does not depend on its own biosynthetic abilities. Only a few enzymes in certain metabolic pathways are really necessarily to keep Salmone...

Cloned stem cells prove identical to fertilized stem cells

...agued by bizarre health complications. This is one reason why scientists generally believe that attempting to clone a human being is morally reprehensible. But are the cloned embryo's stem cells beleaguered by the same defects? Studies have demonstrated that a small number of stem cells in the blastocyst...

Study: Competition for sex is a 'jungle out there'

...roduction could push them towards extinction. One reason that pollen becomes limiting to plants in regions of high diversity may be increased competition between the plants -- there are more plant species vying for the services of pollinators. Also, when there are a lot of species around, plants become mo...

Researchers develop portable 'vein finder' for faster, more accurate injections

... finder has been a deceptively complex task. "One reason it's so challenging is that we're using very simple components to keep costs down," notes Francois Guillot, a research engineer in the School of Mechanical Engineering. Unlike large ultrasound systems used by hospitals for general blood-flow studie...

Ancient DNA provides clues to the evolution of social behavior

...e closely related to everyone, there's not as much reason to fight,'' Chan explains. ''Tucos have a high cost to dispersal-if they leave their burrow they tend to get eaten. If they stay home and help their sisters breed, it makes sense because they'll be helping to pass on genes that are almost identical t...

Bringing the zoos to the zebras

...e instrumental in helping us show that part of the reason that Grevy's zebras fare poorly even in the best of conditions is related to competition with plains zebras," said Rubenstein. "Their data also showed that Grevy's zebras prefer to drink during the morning, highlighting the problem of coexisting with...

Malaria parasites develop in lymph nodes

...asite development in lymph nodes could even be one reason there is so much tolerance to these parasites, he suggested. ...

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