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Tag: "lower" at biology news

Mother birds give a nutritional leg up to chicks with unattractive fathers

...e disadvantages experienced by an offspring from a lower quality male, allowing females to supersede limitations of a suboptimal pairing on her own reproductive success. "For house finches, a species in which individuals are short-lived [and] present a high risk of death, a focus on the immediate reprodu...

What animals can tell us about hemorrhage, organ transplants and aging

...much longer than most similar-sized mammals with a lower metabolic rate. A study of birds, bats and rodents finds differences within their cells that may help explain the longer-than-expected life span of birds and bats, Kristan said. These are just two of the symposia taking place at the conference. T...

AIDS study challenges conventional treatment guidelines for HIV patients

...rience more rapid CD4 cell loss than patients with lower viral loads. Until now, however, there had been no attempt to quantify how well this observation held when considering the estimated rate of CD4 cell loss for each individual patient. Using sophisticated statistical modeling, the researchers ...

Solved: The mystery of flesh-eating bacteria's relentless attack

...t strain succumbed to infection, a death rate much lower than that of mice who received the original strain. Mice receiving the original bacteria developed lesions that grew until the mice died; while mice receiving the mutant strain developed only small lesions that spontaneously healed. "The experimen...

Breastfeeding boosts mental health

...that were breastfed for at least six months are at lower risk of mental health problems," Dr Oddy said. ...that children that were breastfed had particularly lower rates of delinquent, aggressive and anti-social behaviour, and overall were less depressed, anxious ...

Melatonin improves mood in winter depression

... not cause drowsiness, because the doses used were lower than what is usually taken at bedtime. In addition to bright light exposure, another treatment may be in the offing once low-dose, sustained-release melatonin formulations become available. "However, people in the phase-advanced subgroup should use ...

Finding the right mix: A biomaterial blend library

...e-consuming task. As the blends gained a higher or lower proportion of a respective material, the cells around them react by changing shape, ultimately increasing or decreasing contact with the films. In the body, such cell-material dynamics are critically important to the outcome--determining whether a bi...

Researchers find that bumblebees' flower choice matters

... self-pollination ?seed production is considerably lower and the resulting seedlings are much less vigorous. Using genetic analysis to establish paternity, Karron has demonstrated that adjacent flowers differ markedly in their mating patterns. "It's amazing what we've found," he says. "When a bee visit...

Herbal medicine silymarin may help sugar-control in people with type II diabetes

...ws that this extract can help people significantly lower the amount of sugar bound to haemoglobin in blood, as well as reducing fasting blood sugar levels. Silymarin contains a number of active constituents called flavolignans which are also used to help protect the liver from poisoning. "We don't kn...

Tastes great! Study shows brain's response to pleasing -- and changing -- tastes

...heir ventral pallidum brain activity was also much lower in response to the salt water. But when the researchers put the rats into a salt-deprived state using a combination of diet and hormones that cause the body to get rid of salt, the picture changed. Suddenly, the rats' brain activity rose as high w...

Adults who go to bed lonely get stress hormone boost next morning

...plays a role in influencing them. Individuals with lower levels of cortisol in the morning experienced greater fatigue during the day, a result with potential implications for understanding chronic fatigue. In all of her work, Adam is interested in how people's changing social environments get under the...

Gene therapy prevents the onset of diabetic symptoms in mice

... summer 2002, the soil acidity in both the top and lower layers of the test plot neutralized from being highly acidic to more acceptable levels for sugar maples. The researchers also found that by the second year, calcium levels in the maples' leaves had risen. Acid rain also increases levels of the trac...

Acid rain causing decline in sugar maples, say researchers

... summer 2002, the soil acidity in both the top and lower layers of the test plot neutralized from being highly acidic to more acceptable levels for sugar maples. The researchers also found that by the second year, calcium levels in the maples' leaves had risen. Acid rain also increases levels of the trac...

'Cellular antennae' on algae give clues to how human cells receive signals

...sitive strain of the alga that behaved normally at lower temperatures. At higher temperatures, however, the IFT process stopped, and its components disappeared from the cilia. The cilia themselves were still able to beat, or move back and forth, for about 40 minutes before they began to shorten. The team ...

Eminent inventor of DNA fingerprinting gains new recognition

...m the study of prokaryote systems, yeast and other lower eukaryotes, to behaviour and development in fruit-flies and other animals, the human genome, aspects of medical genetics and the genetics of evolution. ...

Patients to benefit from novel technology revolutionizing high-speed molecular imaging

...imaging equipment, said Patton. Patients receive a lower radiation dose, and personalized scanning takes into account unique patient physiology and anatomy, he added. "Simultaneous imaging of a combination of radiopharmaceuticals can be used to define a specific disease signature leading to noninvasive bio...

Green tea and the 'Asian Paradox'

There is a lower incidence of cardiovascular disease and cancer in ...green tea consumption is a useful dietary habit to lower the risk for, as well as treat, a number of chronic diseases. Certainly, however, smoking cessation ...

A new view on Lyme disease: Rodents hold the key to annual risk

...restingly, though chipmunk densities are generally lower than mice, their numbers were the best predictor of total nymph density in the subsequent year, likely reflecting their inferior grooming skills. Overall, the results found that acorns were the best predictor of Lyme disease risk--stemming from their...

Study identifies substances in grapefruit juice that interact dangerously with some drugs

...ncluding some drugs that control blood pressure or lower cholesterol. Studies have shown that grapefruit juice can cause more of these drugs to enter the blood stream, resulting in undesirable and even dangerous side effects. The drugs affected by grapefruit juice usually have some difficulty entering th...

Evolutionary forces explain why women live longer than men

...gap is affected by social standing. Human males in lower socio-economic levels tend to have higher mortalit...ted, partially because males who have a relatively lower status or lack a mate engage in a riskier pattern of behaviors in an attempt to get ahead, he said. ...

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