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Tag: "greater" at biology news

Complexity constrains evolution of human brain genes

...ndance of expressed genes per neuron appears to be greater in humans. "On the basis of individual neurons of the brain, humans may indeed have a far more active, or even more complex, transcription profile than chimpanzee," the authors note. "We suggest that such abundant and complex transcription may in...

Fragmentation rapidly erodes Amazonian biodiversity

...discovered that forest fragmentation poses an even greater threat to Amazonian biodiversity than previously thought. Their findings, to be published next week (27 November ?1 December) in the journal Proceedings of the National Academy of Sciences USA, summarizes key findings from the world’s largest and ...

Scientists find a key to immune system's ability to remember

... clear your enemies faster. The memory T cells are greater in number and they are more potent." The new insight could help refine therapeutic targets to treat autoimmune diseases and may inform new strategies for suppressing T cell response after transplantation. Now, transplant patients require life-long...

Incidence of stroke decreases over last 50 years

...s lowered incidence of stroke, there is a need for greater primary prevention efforts to reduce the lifetime risk, severity, and 30-day mortality following stroke," the authors conclude. ...

Smoking changes brain chemistry

...d directly with the patient's smoking history: the greater the number of pack years (one pack per day for one year equals one pack year), the lower the NAA level. "The ACC is involved in mediating conditioned reinforcement, craving and relapsing behavior in addiction," said study co-author Christian G. S...

High dopamine transporter levels not correlated with ADHD

...scores of inattention were, on average, five times greater for ADHD subjects than for controls in this study. "These findings suggest that an additional variable in conjunction with dopamine transporters would be required to account for the severity of the symptoms of inattention in ADHD," Volkow said. "We...

Parental genes do what's best for baby

...ry on their gene line. But large offspring require greater maternal investment, so females will try to impose their genetic stamp so that smaller young are born. “The idea that imprinting evolves because of conflict between males and females over maternal investment in their offspring has become a general...

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

...nation season and the squirrel can tolerate a much greater loss of blood during this time. And Carey has foun...amage when exposed to damaging agents, they have a greater ability to repair the damage when it occurs, Buffenstein said. Oxidative stress. The prevailing t...

Inflammation markers identify fatigue in breast cancer survivors

...an experience the long-lasting fatigue syndrome, a greater proportion of breast cancer survivors endure the condition. Cancer researchers had explored various possible reasons for the persistent fatigue in breast cancer survivors, Dr. Irwin said, such as different kinds of treatment, or biological events i...

Blood transfusion-transmitted infections: A global perspective

...blood components, necessitating the transfusion of greater quantities and thus exposing patients to blood from more donors; thereby increasing the risk of infection transmission by transfusion. "The possible additional safety interventions that might further reduce the risk of transfusion-transmitted infec...

Scientists' cell discovery unearths evolutionary clues

...roup of organisms with a genetic diversity that is greater than that of fungi and similar to that of all animals. They offer an excellent experimental system for studying aspects of evolution and communication that are not easy to study in more complex multi-cellular organisms. The York and Dundee teams ...

Gene transfer using mutant form of good cholesterol cuts vascular plaque and inflammation

...ld type apo A-I gene. Therefore, we concluded, the greater beneficial effect of A-I Milano gene transfer is most likely related to a greater efficiency of A-I Milano in promoting the removal of cholesterol from the macrophages." Shah, who ...

Scientists use gene signatures to match cancer and other diseases with potentially effective drugs

...ll that has been treated by a particular drug, the greater the odds that the drug will be an effective treatment for that disease. Conversely, the system can reveal the molecular mechanism of a treatment that is effective but whose method of action has been a mystery, and that knowledge can lead scientists...

Gut reaction: Researchers define the colon's genome

...e evidence at hand, the researchers have described greater diversity in the human gut than researchers have reported for samples of acid mine drainage. These microbes are busy, too. The new study shows that resident microbes in the colon actively synthesize vitamins and break down plant sugars, such as xyla...

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

...ower 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 skin to influence their biology and health. "Stress s...

Epstein-Barr virus might kick-start multiple sclerosis

...nsive T cells, but these T cells proliferated to a greater extent when they were stimulated by antigens," said Edwards. "We also examined T-cell responses to influenza hemagglutinin, antigens derived from cytomegalovirus, and even EBV antigens other than EBNA1," Edwards said. "The T-cell responses to these...

New study calculates millions of years saved in lives of AIDS patients

... the benefits of HAART suggested by this study are greater than previously thought and may become still greater if certain barriers to care can be reduced or eliminated--such as the requirement for "extensive, ex...

Results with newer bladeless LASIK equivalent to standard microkeratome LASIK

...pes. The researchers found corneal backscatter was greater with bladeless LASIK for the first three months after surgery, yet the patients perceived no difference in vision after three months between their eyes treated with bladeless or microkeratome LASIK. Backscatter is haziness in the cornea that is usual...

Worm links cancer risk to ageing

The reason why people are at greater risk of developing cancer as they get older may be explained by research published today (June 2). Scientists have discovered that a naturally produced protein that helps protect us from cancer may also determine how long we live. The findings ?pub...

Mouse study reveals new clues about virulence of 1918 influenza virus

...1918 virus containing all eight flu genes was much greater than to any of the other viruses with all eight genes, says Dr. Katze. In particular, genes involved in promoting inflammation were strongly and immediately activated following infection by the reconstructed 1918 virus. "We clearly see a dramatic and...

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