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Tag: "mosquito" at biology news

The insect vector always bites twice

...control strategies, such as the use of impregnated mosquito nets. Analysis of the host-vector relationship, up to now dealt with mainly from the angle of allergic responses to bites or in the search for veterinary vaccines, constitutes now an important research path for new surveillance and prevention strateg...

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

... When a malaria parasite is transmitted through a mosquito bite, the mosquito injects the parasite into skin or blood, which then travels to the liver within minutes, grows and d...

Marine phytoplankton changes form to protect itself from different predators

...though it takes a while, it’s like changing from a mosquito to 76 blue whales or 3,000 bull elephants,” Hay explained. “That’s a pretty dramatic difference.” Defensive responses are often seen in higher plants, but this is believed to be the first report of such a complex and species-specific response in ...

Revealed -- Mosquito genes that could be controlling the spread of killer viruses

...hat make up the immune system of the Aedes aegypti mosquito which transmits deadly viral diseases to humans ha...h out today in Science. The immune system of this mosquito is of great importance as scientists believe it plays a key role in controlling the transmission of ...

Genome of yellow fever/dengue fever mosquito sequenced

...irst draft of the genome sequence of Aedes aegypti mosquito by scientists led by Vishvanath Nene at The Instit...annotation which predicts numbers and locations of mosquito genes in the genome. In parallel to sequencing DNA in chromosomes, scientists have also sequenced la...

Mosquito repellents that emit high-pitched sounds don't prevent bites

...ochrane Systematic Review of the use of electronic mosquito repellents (EMRs) failed to find any evidence that...ected female mosquito. Manufacturers of electronic mosquito repellents (EMRs) claim that the high pitch sound they emit repels female mosquitoes, and therefore ...

Mosquito genes explain response to climate change

...lants and animals." The chromosomal map for the mosquito Wyeomyia smithii, which develop within the carnivo...d. Bradshaw and Holzapfel first showed that the mosquito has changed genetically in response to recent, rapid climate change and now uses shorter, more south...

Multiple malaria infection inhibits spread of parasite

...nhibits transmission. Malaria is not caused by a mosquito but by a parasite in the mosquito. The malaria parasite needs the mosquito to reproduce and spread. The gametocyte is the developmental stage of the parasite that can be trans...

Compound eyes, evolutionary ties

...s (shown surrounding the fruit fly), bees and many mosquito species have the light-gathering units fused together into a "closed system." In a paper published in this week's early online edition of the journal Nature, the scientists report that one of three proteins needed to form these light gathering units...

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

...ve tract of a malaria-carrying mosquito, after the mosquito has fed upon the blood of the vaccinated individua... sperm and eggs. Fertilization takes place in the mosquito gut, after which the parasite imbeds itself in the gut lining. There, it passes through discrete st...

New genetic analysis forces re-draw of insect family tree

...tamorphosis): fruit fly (Drosophila melanogaster), mosquito (Anopheles gambiae), silk moth (Bombyx mori), flour beetle (Tribolium castaneum), honey bee (Apis mellifera) and sibling parasitic wasp species (Nasonia vitripennis and Nasonia giraulti). These insects represent the four major orders of holometab...

New strategy developed to combat West Nile Virus

...which leads to "amplification" of the virus within mosquito populations. Researchers from Oregon State Univer...y in the year, the limited water resources confine mosquito populations to selected habitats ?specifically isolated, densely vegetated hammocks where conditions...

How bad is malaria anemia? It may depend on your genes

... known as plasmodium - is carried through blood by mosquito bites, and in parts of the world where mosquitoes thrive, millions are infected, most of them by early childhood. Once in the bloodstream, plasmodium invades liver and red blood cells and makes more copies of itself. Eventually, as red cells break an...

Movie spies on malaria parasite's sneaky behavior

...finally taken up again from the blood when another mosquito bites. Then it reproduces and waits for the mosquito to bite again to infect another person. Researchers have long assumed that the form of the parasi...

Mosquito spray increases toxicity of pyrethroids in creek, study finds

...x creeks in Sacramento, Calif., after the county's mosquito control authorities took the rare step of applying...er that was sampled in Sacramento after the aerial mosquito spray, the researchers compared the reproduction and survival rates of a species of water flea, Ceri...

UGA study explains peaks and troughs of dengue epidemics

...s to areas that were previously dengue-free when a mosquito bites an infected traveler and then spreads it to others. According to the Centers for Disease Control and Prevention, Aedes aegypti and the related Aedes albopictus (the Asian tiger mosquito) have the potential to spread dengue in sporadic outbreaks...

Genetically engineered mosquitoes show resistance to dengue fever virus

...have successfully created a genetically engineered mosquito that shows a high level of resistance against the ...one of a team of researchers who injected DNA into mosquito embryos, creating the first stable transgenic mosquito resistant to Type 2 dengue fever virus, the m...

Scientists develop malaria forecasting tool to predict disease risk

...of good rainfall ?when the heat and humidity allow mosquito populations to thrive. By using a number of climate models, we were able to compose weather predictions for such countries, which could then be used to calculate the severity of an epidemic, months before its occurrence." The team created a predic...

Warming trend may contribute to malaria's rise

... and desert fringes. Because the life cycle of the mosquito that transmits malaria and the microorganism that ...e abundance of mosquitoes," she said. "And because mosquito abundance is generally quite low in these highland regions, any increase in abundance can be an impo...

Malaria parasites develop in lymph nodes

...ine, published online on January 22, 2006. When a mosquito infected with Plasmodium bites a mammal, the immat... no one has measured directly how many parasites a mosquito bite transmits or where else in a mammal's body they travel, said Ménard. To find out, he and his co...

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