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Tag: "bite" at biology news

Largest synthetic gene ever built offers insights into anti-malarial drug resistance

... single-cell protozoan parasite transmitted by the bite of the female Anopheles mosquito. There are about 160 different species of malaria parasites, according to Roepe. Five infect humans, but P. falciparum is responsible for about 1 million deaths out of 300 million acute cases of infection each year. M...

Potent possibilities for parasite attack

... over the past ten years. It is transmitted by the bite of various species of sandfly: wild and domesticated animals - as well as humans - act as a reservoir for the disease....

Researchers develop way to calculate speed of bacterial sex

...suspecting non-related bacteria cells. Just as the bite from a vampire leads a victim to be transformed into a vampire, the donor bacteria’s "bite" injects genetic material into the recipient, causing the recipient to become a donor. The controlling rates of conjugative gene transfer and the kinetics of c...

Rare soft-shell turtle, nesting ground found in Cambodia

...ws and can extend its neck with lightning speed to bite with jaws powerful enough to crush bone. “It has the fastest strike of any animal I’ve ever seen, including cobras,?Emmett said. The researchers also found a nesting ground for the species and brought back eggs that have since hatched. The hat...

Fused nasal bones helped tyrannosaurids dismember prey

...nsion of jaw muscles and the consequent ability to bite deeply in the bone. Snively's team found that ...down on other animals. "With tyrannosaurs, all the bite force was delivered to the prey," he said. "The T. rex especially had a very strong skull and jaw mu...

Ancient amphibians evolved a bite before migrating to dry land

.... "The analysis suggests that amphibians evolved a bite before emerging onto land as fully terrestrial animals." ...

Resistance and genetic sensitivity to sleeping sickness

...ite, the trypanosome, transmitted to humans by the bite of an insect, the glossinid tse-tse fly. There has been a resurgence of this disease over the past 20 years in Sub-Saharan Africa. The World Health Organization (WHO) in a 1998 report estimated the number of people infected to be about 300 000. Aware...

Too mellow for our predatory world

...ens of the National Park keep finding animals with bite marks from dogs. Although these wounds are not fatal in themselves, they often lead to secondary infections which eventually kill the animals. It appears that while marine iguanas are capable of learning to recognise predators they are unable to ef...

Malaria vaccine prompts victims' immune system to eliminate parasite from mosquitoes

...The parasite is injected into an individual by the bite of an infected mosquito. Numerous experimental vaccines have been tried against the form of the parasite that resides in humans, but have been unsuccessful or produced limited immunity. The Plasmodium cells escape the human immune system by hiding ...

Winning by a neck -- Giraffes avoid competing with shorter browsers

...ivores can reach. Giraffes receive more leaves per bite by foraging high in the tree, but it's unclear whether this is caused by competition -- smaller browsers eating some of the leaves at lower heights -- or if more leaves grow at higher levels. The researchers built low fences around trees in grea...

New understanding of parasite cell structures may provide treatments for serious tropical diseases

... The parasite is transmitted to humans through the bite of the tsetse fly, in which the trypanosome transfers from the mid-gut to the salivary glands where it enters the human bloodstream when the fly bites. "We found that putting these cells under stress similar to that initially encountered by the tryp...

Movie spies on malaria parasite's sneaky behavior

.... Then it reproduces and waits for the mosquito to bite again to infect another person. Researchers have long assumed that the form of the parasite that infects red blood cells, called a merozoite, was released from a ruptured liver cell and moved on its own back to the bloodstream. But studies in the ...

Flick of whiskers helps tease out brain's 'shadow' signaling system

...tance, or a certain texture might indicate a yummy bite of cheese nearby. Scientists have found that the way an animal's brain learns information from its whiskers mirrors the way people learn from their senses. Wang and Nedergaard found that with a puff of air on a whisker, astrocytes become activated ?...

Researchers add crucial information on how the body's T cells react to parasitic diseases

..., is transmitted to mammals and humans through the bite of several genera of flying, biting insects. What intrigued Tarleton was that T cell response to infection from T. cruzi, while important to the body's ability to fight disease, has remained somewhat cryptic because of the daunting complexity of the ...

Stanford snake venom study shows that certain cells may eliminate poison

...y snakebite is horrible. The immediate pain of the bite is followed by swelling, bruising and weakness, then sweating or chills, with numbness, nausea, blurred vision and possibly convulsions before it's all over. Such misery is produced by a veritable witches' brew of toxins in snake venom. It's long b...

Taipan venom no snake oil

...akes literally have a two-pronged attack when they bite their prey," Dr St Pierre said. "Firstly, venom injection causes massive blood clots instantaneously followed by paralysis as a result of neurotoxins which eventually immobilise and kill the victim." Dr St Pierre said mammals and snakes naturally p...

Evolution mystery: Spider venom and bacteria share same toxin

...oxin from the spider's venom can kill flesh at the bite site; the bacterium causes various illnesses in farm animals. "Our research was inspired by the fact that we have a group of spiders with a unique toxin, and that toxin also happens to exist outside the animal kingdom in this particular bacterium," ...

FSU biologist says new dinosaur is oldest cousin of Tyrannosaurus rex

...n expert in dinosaur and crocodilian dentition, or bite force –?has helped to generate interest in the sciences among young children, typically fascinated by animals such as dinosaurs and crocodiles. He is an assistant professor of anatomy and vertebrate paleobiology at FSU; curator of the Florida State U...

Genomics-based vaccine could prevent deadly cattle disease

...s the disease. When ticks infected with T. parva bite cattle, they transmit the parasite, launching the disease that typically kills cattle within a month. In July, 2005, TIGR led a research team that published T. parva 's genome sequence, representing roughly 4,000 genes, in Science. In the current ...

Potential vaccine developed for deadly leishmaniasis disease

...ent issue of ACS Chemical Biology . Spread by the bite of infected female sand flies, visceral leishmaniasis infects about 500,000 people annually, with the majority of cases occurring in India, Bangladesh, Nepal, Sudan and Brazil. Despite a major research thrust by the World Health Organization (WHO), ...

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