Tag: "rises" at biology news

No Such Luck: Nitrogen From Air Pollution Unlikely to Moderate Global Warming

...l grow progressively worse as the human population rises unless we take direct steps to counter it."...

Hot 'Lanta: NASA, School Kids Team To Study How Trees Help Cities Keep Their Cool

...orbs a large amount of heat before its temperature rises 1 degree, and takes a long time torelease it. That means that trees, which have a large water content and release water into the atmosphere to keep themselvescool, also absorb a lot of the incoming heat and release it over a longer period of time. ...

New Mechanism To Explain Carbon Monoxide Poisoning Identified

... "The amount of nitric oxide in the cell interior rises because carbonmonoxide usurps the spot of nitric oxide on the heme proteins," says Thom. Thisimbalance makes NO available for biochemical reactions that would not normallyoccur within the cell, namely ones that produce tissue-damaging oxidants andfre...

Divorce, Insect Style: Termites Swap Mates

...at the nest or on the prowl, the dissatisfied mate rises up on its legsand begins a bouncy, stilt-walking motion while wiggling a section of itsabdomen where a pheromone-producing gland is found. The airborne chemicalsex-attractant in the pheromone and the characteristic posture are whatadvertises the te...

Gene For Inherited Syndrome Is Possible New Tumor Suppressor

... role in causing cancer. But inthose cases, cancer rises because the genes produce too much of the enzyme. In PJS, on the other hand, cancer seems to occur because a protein kinase isn'tproduced. "As of now," said de la Chapelle, "we have no clue as to how the loss of this gene might lead to cancer. That w...

Antioxidants May Reduce Harmful Complications Of Diabetes

...Insulin issecreted when the level of blood glucose rises -- as after a meal. All diabetic patients in the study were taking only drugs referred to assulfonylureas, which increase the sensitivity of receptors to insulin throughoutthe body. Half the patients exhibited microalbuminuria, the excretio...

Relatives Of People with Colorectal Polyps Face Increased Risk For Colorectal Cancer

... If a person has a relative with adenoma, the risk rises to about 10percent to 12 percent. The study also found that therisk was higher if the affected relative was diagnosed with polyps at a youngerage. The relatives were not at increased risk for other types of cancer. Dr. Neugut feels strongly t...

Long-Term Study Looks At HIV Positive Men With Few Signs Of Disease Progression, 10-18 Years After Seroconversion

...l therapies if the amount of virus in their plasma rises to moderatelevels, even if their CD4 counts remain relatively high....

Molecular Circuit Breaker Can Prevent Runaway Cell Growth

... toproliferate. When the strength of these signals rises to dangerous levels, ARFrelays this information to another growth inhibitory protein, p53, that in turnprevents the over-stimulated cells from growing and can even induce them tocommit suicide. One protein whose levels are carefully monitored by this...

Adaptation's Basis May Be A Mix Of Genetic Tweaks, Whoppers

...ions are needed, thenumber of more minor mutations rises exponentially with theirgenetic insignificance. Orr's theory is based on mathematicalmodeling and computer simulations, and assumes that a populationis well-positioned to adapt to environmental pressures. He nowplans to use a common laboratory techni...

Birds Of A Feather: The Physics Of Flocks

...soup on the bottom. Then, the liquid on thebottom rises to transfer its heat directly to the colder stuff on top.Convection is the most efficient way to transfer heat on large scales. In thebird flocking model, the carrier of information (the bird) moves through theflock to distribute its information. I...

DOE Joint Human Genome Effort Exceeds Sequencing Goal

... ofEnergy Research. "With this milestone, the JGI rises to the third positionworldwide in terms of its total contribution of human DNA sequence to publicdatabases, and signals great promise for completion of the entire project infive years." The JGI, established in 1996, is a consortium of scientists, en...

Researcher Finds World's Most Diverse Home Of Slime Molds

...form a stationary stalkcontaining cellulose, which rises above the ground and leaves behind spores thatstick to the feet of scurrying animals on the forest floor, spreading the sporesfor new life elsewhere. "They are extremely old organisms that evolved before plants andanimals, so they have found ...

Gene Therapy Incorporates Molecular Rheostat For Controlled, Long-Term Drug Delivery

... valleys in the amount of drug in the blood, which rises sharply afteradministration and then declines steadily until the next dose. Side effects areoften most severe during peaks and then drop to levels that may not providetherapeutic benefit during valleys. "One of the real advantages of using...

Largest Acoustics Meeting In History Expected

...ers are concerned that the melting of glaciers and rises in sea level would drastically alter the world's climate. To measure climate variability and look for signs of global warming in this part of the world, a Norway-UK-Germany-Russian collaboration has embarked on a program called AMOC short for Acoust...

Hold The Salt: Gene May Explain African Americans' Extra Sensitivity To Salt, Leading To High Blood Pressure

...omary levels ofdietary salt intake, blood pressure rises in some people considered to besalt-sensitive. "High blood pressure damages the kidneys, brain, heart, and other vital organs,"says Flack. "The rise in blood pressure causes the kidneys to leak protein andalso contributes to an abnormal increase in h...

Plants Use 'Snorkels' To Survive Floods

...ng a flood, the level of ethylene gas in the plant rises and the concentration of oxygen falls. So as not to 'drown', certain plants use rapidly growing new shoots as a means of channelling life-saving oxygen through the stalks and roots to their root tips. Up to now, it has been unclear why certain specie...

Antbird capable of increasing testosterone level when threatened

...hat in temperate-zone birds, testosterone in males rises inthe spring as birds settle into new territories and seek mates. Afterward,testosterone levels drop off and remain low. Wikelski's team found thattestosterone levels in tropical birds may remain at baseline year round. Butwhen confronted by other bi...

New study establishes when pregnancy starts

...egnancy is really the first detection of hCG,which rises very rapidly once the fertilized egg attaches to the uterus. That'sin fact the most hidden event of pregnancy and has never been seen before." Fertilization begins about a week earlier when egg and sperm unite, hesaid. Many fertilized eggs, h...

Ecotourism: Penguins can get used to people

...ood level of corticosterone, asteroid hormone that rises with stress and can kill animals if it gets too high. Walker and his colleagues found that after 15 minutes of exposure to people, thepenguins along the tourist trail were far less stressed than those in the remotearea. "Tourist trail" penguins displ...

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