Tag: "defend" at biology news

Sex and gender scientists explore a revolution in evolution

...ter. Subordinate, ''satellite'' waterbucks help to defend the territory, and in turn may mate with a few females and get a shot at inheriting the territory when the dominant male retires. The payoffs for the dominant and satellite waterbucks may balance out in the long run. Homosexual behavior is common but...

Causation between white blood cells and lung disorders confirmed

...ose in asthma take place. Their natural role is to defend the body against parasites. At best, it is believed that asthma occurs following a malfunction of our protective mechanism against parasites. At worst, several studies with mouse models that correlate pulmonary eosinophilia with lung dysfunction fa...

Livermore researchers apply combat simulation technology to homeland security

...tradeoff analyses, and operational capabilities to defend against catastrophic terrorism, including nuclear, chemical, biological, cyber attacks and other threats that can cause mass destruction or disruption....

Scientists find insects can alter plant chemistry to help them find mates

...asps will emerge." "The males find these sites and defend them," he said. The males will head-butt one another, forcing some to leave. Others are driven off by wind or predators, such as spiders and beetles, requiring the wasps to find new stems amid the assorted plant debris. Males, they found, only choo...

New genetic option for thwarting cancer

...o a set of tumor suppressor genes, however, we can defend against this daily onslaught. Goaded into action, these genes push cells into a kind of molecular menopause, called senescence. The cells remain healthy, but they stop reproducing. Researchers often assume that we need our tumor suppressor genes to...

Teamwork in the intestine: Gut bacteria interact with intestine to regulate blood supply

...rmal components of the intestinal lining that help defend the body against attacks by harmful bacteria. Without Paneth cells, blood vessels could not completely develop, even when microbes such as B. thetaiotaomicron were introduced. The team concluded that B. thetaiotaomicron and Paneth cells work together...

Researchers identify a gene essential for the natural killer cell response against cancer

...g. One of these, the innate immune component, must defend the body against onslaughts from foreign substances it has never before seen. Failure of the immune system can result in cancer, autoimmune disease, or life threatening viral infections. Scientists at Memorial Sloan-Kettering Cancer Center have ident...

A mane is a pain, but worth it for male lions

...ivals. Also, a male that advertises his ability to defend a pride and its cubs should appear attractive to females. To find out how the two sexes responded to different types of manes, West, working in Serengeti National Park, set up pairs of realistic-looking dummy lions about 200 meters from adult lions. ...

U of C researcher tracks path of flying snake

...ing as part of his dissertation, which he plans to defend in November. His research also includes detailed analyses of takeoff and how body size relates to gliding ability. But the young biologist had to start from zero. "I didn't know where to begin," Socha admitted, since little was known about these snak...

UCR scientists discover a novel adaptive antiviral defense mechanism in animals

... time that animal cells have used RNA silencing to defend against viral infections. Because the animal viral suppressor identified also blocks RNA silencing in plants, their results provide the first experimental evidence for a highly conserved antiviral pathway in the animal and plant kingdoms. In addition...

A new weapon to disable bacteria discovered

...e blood cells, the very cells that are supposed to defend us. A case in point is dysentery, a serious, bloody form of diarrhea. It is caused by bacteria called Shigella. This is a devastating disease that claims millions of lives every year, especially among children in the developing world. Shigella uses ...

Australian frog is first to make its own chemical weapons

... Poison frogs release alkaloids from their skin to defend against predators. Until now, the researchers believed that all obtained their alkaloids from eating insects. The discovery was reported in the April 3 Web edition of the Journal of Natural Products, a peer-reviewed publication of the American Che...

Some animals can recognize degree of kinship by scent

...very close kin, the ones they should be helping to defend territories or evade predators. The more distant the relationships and the greater the differences in genetic make-ups, the more time was spent sniffing and evaluating scent compounds. "The sensitivity and discrimination of their olfactory apparatus ...

New dinosaur related to Triceratops

...ad, it probably relied on concealment or flight to defend itself." Liaoceratops ate plants, possibly ginkgo, horsetails or conifers. Evidence of these plants is preserved in the same rock unit in which the dinosaur was found. Its teeth were built primarily for slicing and shearing rather than grinding. "Lia...

Multimillion dollar immunology research directed at edible or nasally delivered vaccines

... work also might be able to be used and applied to defend against bioterror weapons such as anthrax. A method of producing vaccines quickly and inexpensively would be of great benefit not only to the military, but also to the general population....

Stanford researchers uncover possible approach to attack HIV-infected cells

...ithout harming the healthy cells the body needs to defend itself against disease. Plans are under way to test the drug in people with the HIV virus. HIV devastates the body's immune system by taking over and killing a particular class of white blood cells known as CD4+ helper T cells. These cells co...

Eat your veggies: Indirect anti-oxidants provide long-term protection

...shows that the compound, sulforaphane, helps cells defend themselves for days against highly reactive and toxic molecules called oxidants. Unlike standard anti-oxidants that use the molecular equivalent of hand-to-hand combat, broccoli's compound is a covert operative that works indirectly. Oxidants are l...

Antimicrobial peptides: new weapons to fight infection

...imicrobial peptides, Dr. Zasloff reports, tuned to defend the organism against microorganisms that it will encounter. The study of antimicrobial peptides in plants and animals has provided insights into the innate defense systems that permit multicellular organisms, including humans, to live in harmony with...

Virginia Tech researchers join NSF Arabidopsis 2010 Project; may help produce plants that defend themselves without pesticides

...search could be the development of plants that can defend themselves better without pesticides or plants tha...n of enzymes is in plant defense. "Plants have to defend themselves on their own ground," Esen said. "A way to do that is through toxic materials that are a...

Plants, insects play cat and mouse game

...iour by releasing specific chemicals and toxins to defend itself against the particular insect. Insects, in turn, adjust their phenotype - how they look and behave - and their physiological state by adapting the enzymes in their stomach to better digest the plant. This flexible cat-and-mouse strategy result...

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