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Tag: "average" at biology news

International HIV/AIDS trial finds continuous antiretroviral therapy superior to episodic therapy

...ed the study. At the time of the DSMB review, the average follow-up was approximately 15 months. The analysis revealed that participants on CD4+ cell-guided episodic treatment faced more than twice the risk of disease progression relative to participants on continuous ART. Furthermore, there was an increase...

Warbling whales speak a language all their own

...o measure a song's complexity, Suzuki analyzed the average amount of information conveyed per symbol. He then asked human observers who had no previous knowledge of the structure of the whale songs to classify them in terms of complexity, redundancy, and predictability. The computer-generated model and the h...

Warming trend may contribute to malaria's rise

...ature, some scientists have speculated that rising average temperatures may be making conditions more favorab... But a 2002 study found no significant changes in average temperature in the highlands of East Africa, where malaria has become a serious public health proble...

Researchers use dirt to stay one step ahead of antibiotic resistance

...tance. Not only were the bacteria resistant to an average of seven to eight antibiotics, but every strain was found to be multi-drug resistant. The bacteria showed resistance to all major classes of antibiotics, regardless of whether the compounds were naturally produced, semi-synthetic, or completely sy...

Scientists design potent anthrax toxin inhibitor

...functionalized liposome are arranged with the same average spacing as the binding sites of the PA molecule, which permits a firmer bond between the two, explains Dr. Kane. When the inhibitor is bound tightly to PA, the subsequent steps of enzyme entry cannot occur and the toxin is effectively neutralized. ...

Malaria parasites develop in lymph nodes

...te a mouse. From each mosquito bite, they found an average of 20 fluorescent parasites embedded in the animal's skin. Ménard found that the parasites moved through the skin in a random, circuitous path at a speed that is amongst the fastest recorded for any migrating cell. After leaving the skin, the parasit...

Study finds drug may cut down involuntary movements

... movement in patients with Huntington's disease on average by about 25 percent, with many patients experiencing a greater improvement, according to a study in the February 14 issue of the journal Neurology. Overall, patients who received the medication were six times as likely to be considered by their doc...

Antioxidant selenium offers no heart-disease protection

...s or medications. Individuals were followed for an average of 7.6 years. Results showed no association between selenium supplementation on any of the endpoints studied: coronary heart disease, stroke or deaths from cardiovascular disease, Stranges said. There also was no difference in the endpoints based o...

There's something fishy about human brain evolution

...aren't just comparatively big, they're hungry. The average newborn's brain consumes an amazing 75-per cent of an infant's daily energy needs. According to Dr. Cunnane, to fuel this neural demand, human babies are born with a built-in energy reservoir ?that cute baby fat. Human infants are the only primate ba...

Human albumin from tobacco plants

...s this percentage by fourteen (to 7%), reaching an average of 0.9 milligrams of HSA per gram of fresh leaf weight. The key is the place where the gene in question is deposited. With the nuclear transformation method, it integrates into the DNA of the cell nucleus of the leaf and, thus, can only manage a sm...

Mute swan population helps explain longstanding evolutionary question

...t focused on the question: Why does a population's average clutch size differ from the most productive clutch size?" said researcher Ann Charmantier. "Gradually the debate switched to an evolutionary point of view with a second, related question: Why is clutch size not evolving despite significant heritabili...

Sustainable farm practices improve Third World food production

...urce-conserving practices. Yields increased by an average of 79 percent during the study, according to corresponding author Jules Pretty of the University of Essex in England. Working with colleagues in Thailand, China, Sri Lanka and Mexico, Pretty found nearly all of the farm projects increased their yield...

Sexual reproduction delays aging in a mammalian species

...lived extraordinarily long (up to 20 years) and on average about twice as long as their non-breeding counterparts. The researchers were also able to show that this pattern was not caused by differences in intrinsic biological quality, social rank, or workload between breeders and non-breeders. These findin...

2005 was the warmest year in a century

...New York City noted that the highest global annual average surface temperature in more than a century was recorded in their analysis for the 2005 calendar year. Some other research groups that study climate change rank 2005 as the second warmest year, based on comparisons through November. The primary diffe...

Taking a bite out of a fellow worker helps wasps recruit new foragers

...oraging. The rate of being bitten increased by an average of 600 percent for these recruited foragers, while...sps, O'Donnell first collected and anesthetized an average of about 300 workers from each of the colonies. He then marked each wasp's thorax with a color-code...

Mouse study reveals human X-SCID gene therapy poses substantial cancer risk

...f years. Mice that developed lymphoma did so at an average of 10 months of age. In the human gene therapy trials, leukemia did not appear until 2-3 years after treatment, Woods says. "This indicates that preclinical experimental treatments involving transgenes should include long-term follow-up before en...

Oceans are 70 percent shark free

...ngs of The Royal Society, Biological Series. The average depth of the oceans is 4,000m and bony fishes - relatives of cod - thrive down to around 9,000m depth. Scientists do not know why sharks are absent from the deep but suggest one possible reason could be due to lack of food. They warn their findi...

Cortex matures faster in youth with highest IQ

...st scores: superior (121-145), high (109-120), and average (83-108). The researchers found that the relatio... age 11 or 12 before thinning. In their peers with average IQ, an initially thicker cortex peaked by age 8, with gradual thinning thereafter. Those in the high...

Hormonal male contraception reversible after few months for all men

...ty. Data were available for around 1500 men. The average time for sperm recovery to 20 million/mL was 3? months. Various factors were associated with higher rates of recovery including older age, Asian origin, shorter treatment duration, and higher sperm concentrations at baseline. Although these factors m...

Study shows AIDS drugs cost-effective, care underfunded

...s far less than the providers' actual costs, which average approximately $1,500 to 2,000 per patient per year. The study assumed all patients had Medicare health insurance and the clinics were reimbursed 100 percent. "However, the majority of people who are infected with HIV are either uninsured or underins...

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