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Tag: "hosts" at biology news

Genome of deadly amoeba shows surprising complexity, evidence of lateral gene transfer

...isease hits only a small fraction of those who are hosts to the parasite. "Intestinal infections are one of the major health problems in developing countries and the number of people who are infected with amoeba cysts is enormous," he says. Typically, those cysts are transmitted when people ingest contami...

Scientists reveal molecular secrets of the malaria parasite

...ve on a molecular level as they move between their hosts and insectvectors.That focus on the parasites' com... mosquito vectors, three stagesin their vertebrate hosts and a sexual development stage during whichthe parasite is transmitted between vector and host.The S...

Scientists discover unique microbe in California's largest lake

... is what allowed the microbe to survive withoutits hosts in the saline lake.At the University of Oregon since 1990, Wood is a member of the UO'sCenter for Ecology and Evolutionary Biology. She has played a key rolein changing the scientific world's understanding of how ocean food websare based on much smal...

The Bacteria's guide to survival

...nce gene expression and the fate of cells in their hosts by tugging on the host cells' membranes with their pili. For bacteria like N. gonorrhoeae that pass directly from host to host, the researchers argue, it would be in a bacterium's interest to help keep its host alive. And bacteria appear to do this w...

In the migratory marathon, parasitized monarchs drop out early

...that seemingly small effects of parasites on their hosts could have a much larger impact when combined with the stresses of long-distance migration. ...

A new study examines how shared pathogens affect host populations

...ase or West Nile encephalitis that infect multiple hosts are commonly transmitted by vectors, and their tra...te is often thought to depend on the proportion of hosts or vectors infected (i.e. frequency dependence). A study, to appear in the July 2005 issue of The Am...

NASA study finds snow melt causes large ocean plant blooms

...to a decline in fish populations. The Arabian Sea hosts one of the world's largest pools of oxygen-poor water at depths between 200 and 1,000 meters (656 to 3,281 feet). Since the Arabian Sea lacks an opening to the north, the deeper waters are not well ventilated. Also when organic matter produced by phy...

Stealth Worms May Improve Insect Pest Control

...d larva, carrying the bacteria, and look for other hosts to begin the cycle again. These juveniles also can... temperature and moisture requirements, the insect hosts it colonizes and other characteristics. Lists of EPN evolutionary associations, called phylogenies, ...

Scientists identify genes responsible for 'black rot' disease in vegetables

...stard, radish, rutabaga, and turnip, are potential hosts for Xcc. The model plant Arabidopsis thaliana is also susceptible to Xcc infection. Surprisingly, however, some wild cruciferous weed species do not manifest the characteristic symptoms of "black rot" disease when infected. To date, there is no effe...

Discovery could be key to bioterrorism defense

...ng the potential for amplification in intermediate hosts and transmission greater. Ephrin-B2 is highly conserved in animals, and this finding sheds light on how these viruses can infest such a wide range of hosts. "In addition to our concern about Nipah and Hendra viruses as emerging global health and eco...

Immune system's distress signal tells bacteria when to strike back

...messages that allow microbes to eavesdrop on their hosts or to conspire together to mount an attack. "We c... disease. The battles between pathogens and their hosts have been going on for millions of years, Alverdy said, with each side constantly devising novel mea...

Study: Harmless virus kills some cancers

...d normal human epithelial cells, which are natural hosts for both AAV2 and HPV. In cultures infected with both AAV2 and HPV, the team found that after six days, all HPV infected cells had died. Meyers then used the same approach in four types of cancer ?cervical, breast, prostate and squamous cell - all ep...

Vineyard weeds found to host Pierce's disease of grapes

...e weeds. Perennials and known feeding and breeding hosts of the glassy-winged sharpshooter were tested first, then plants particularly abundant in or near vineyards. "Our objectives were to determine the fate of Pierce's disease infections in previously untested plant species associated with southern San ...

Ants, not evil spirits, create devil's gardens in the Amazon rainforest, study finds

...devil's gardens by poisoning all plants except its hosts with formic acid. By killing other plants, M. schumanni provides its colonies with abundant nest sites--a long-lasting benefit, as colonies can live for 800 years." Devilish ants Most tropical rainforests are densely populated with a remarkable d...

Virus uses tiny RNA to evade the immune system

...f the hide-and-seek game between pathogens and the hosts they infect, researchers have found that a virus appears to cloak itself with a recently discovered gene silencing device to evade detection and destruction by immune cells. The report by Howard Hughes Medical Institute (HHMI) researchers in an arti...

Stolen gene allows insect virus to enter cells

..., a group of viruses that can liquefy their insect hosts in a matter of days but don't induce so much as a sneeze in mammals, as potential pesticides. But the viruses would require tweaking to be effective since they kill insects more slowly than chemical insecticides. Studying baculoviruses also yields in...

Drug resistant avian influenza viruses more common in Southeast Asia than North America

...enBank database on 408 viruses isolated from avian hosts worldwide. Based on the study, the St. Jude team reported that there were no avian amantadine-resistant strains isolated from 1979-83 in the northeastern United States and Southeast Asia. However, 31 percent of H5 and 11 percent of H9 influenza vir...

On a wing and a prayer - Alaska researchers seek clues to bird flu

...ne species to another. Wild birds are the natural hosts of many influenza viral strains that normally do not infect humans. However, recent outbreaks of bird flu in Southeast Asia were caused by a highly pathogenic H5N1 strain and there is increasing evidence that this strain can jump the species barrier ...

A new link between stem cells and tumors

...sinus says; cells could be retransplanted into new hosts for years, generation after generation, with similar effects. The study proves that specific genes in stem cells ?those which control the fates of daughter cells ?are crucial. If such genes are disrupted, the new cells may no longer be able to contr...

Chlamydia parasite lives off our fat

...ar. Chlamydia gets around because it knows its hosts so well. It's an "obligate intracellular parasite" which means that it relies on its eukaryotic host for everything from reproduction to synthesizing ATP, all while living inside a membrane-bounded vacuole that provides a protected, fertile environme...

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