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Mosquitoes in Biological News

Pathway found that lets mosquitoes fatten up, slow down for winter

COLUMBUS, Ohio Two genes that help insulin regulate mosquitoes growth have been identified as key contributors to how the insects enter a dormant state to survive winters cold. The research finding broadens the understanding of the mosquito life cycle and appears to shed some light on how oth...

Netting mosquitoes to prevent malaria

EAST LANSING, Mich. Michigan State University scientist Ned Walker is taking on one of the biggest killers in the worldmalaria. And he believes he can help win the battle to save lives, especially the lives of children. With a recent $1.7 million grant from the National Science Foundation, Walke...

Earlier bites by uninfected mosquitoes boost West Nile deaths in lab mice

GALVESTON, Texas Theres one more reason to try to avoid being bitten by mosquitoes, scientists have discovered: bites from mosquitoes that arent infected by the West Nile virus may make the disease worse in people who acquire it later from West Nile-infected mosquitoes. Researchers from the Un...

Midge keeps invasive mosquito in check, aiding native mosquitoes

AUDIO: Barry Alto describes his research on the interactions of predators and prey. This is the audio for an audio slide show. Click here for more infor...

Researchers put the bite on mosquitoes

Few things sting like a mosquito's bite--especially if that bite carries a disease such as malaria, yellow fever, Dengue fever or West Nile virus. But if researchers from The University of Arizona in Tucson have their way, one day mosquito bites may prove deadly to the mosquitoes as well. "Our ...

Oxidation defense in mosquitoes benefits malaria parasite

Scientists from two universities in Italy and Virginia Tech in the United States have determined the structure of a protein that is responsible for the production xanthurenic acid (XA) in Anopheles gambiae, the malaria carrying mosquitoes. XA plays a key role in the sexual reproduction of the malar...

Genetically engineered mosquitoes show resistance to dengue fever virus

Researchers have successfully created a genetically engineered mosquito that shows a high level of resistance against the most prevalent type of dengue fever virus, providing a powerful weapon against a disease that infects 50 million people each year. Anthony James, a UC Irvine vector biologist,...

Gene that helps mosquitoes fight off malaria parasite identified

Researchers have identified a gene in mosquitoes that helps the insects to fight off infection by the Plasmodium parasite, which causes malaria in humans. Anopheles mosquitoes transmit the malaria parasite to nearly 550 million people worldwide each year with these cases resulting in more than 2 mi...

Urban water ecology at the ESA annual meeting

...stems. Urban stream pollution can be good for mosquitoes Sewage overflows are a fact of life in urban ar...rcher at Emory University, and his team discovered mosquitoes in abundance in a sewage-contaminated stream in At...ely in a nearby clean stream. They also found that mosquitoes were largest in streams with high levels of organi...

Salt marshes: A natural and unnatural history

...and people because of the environmental service and protection they provide, salt marshes were once considered unproductive wastelands, home solely to mosquitoes and toxic waste, and mistreated for centuries by the human population. Exploring the fascinating biodiversity of these boggy wetlands, SALT MARSHES: A...

Vaccine blocks malaria transmission in lab experiments

...grows within the mosquito. Sexual development is a critical step in the parasite's life cycle and necessary for continued transmission of malaria from mosquitoes to humans. The study is published in the July 22 edition of the journal PLoS ONE . "Development of a successful transmission-blocking vaccine is ...

Jeepers creepers: Climate change threatens endangered honeycreepers

...ange. At one time, the Hawaiian Islands had no mosquitoes and no mosquito-borne diseases. But, by the late 1800s, mosquitoes had set up permanent housekeeping, setting the sta...ters) -- mountains not only provided habitats that mosquitoes didn't thrive in, but they also had habitat that h...

Old stain in a new combination

...ogen in infected persons from being re-ingested by mosquitoes and then transmitted to others and is thus twice a...usceptible. Malaria pathogens need humans and mosquitoes When the Anopheles mosquito bites, the malari...berg. Methylene blue prevents transmission to mosquitoes The appropriate component for such an alterna...

$1.6 million grant to lead development of resistance-detecting field kit

...ll be working in partnership to identify genes that render malaria-carrying mosquitoes resistant to a range of insecticides that are used for IRS and ITN. At pre...s reliant upon the use of insecticides against mosquitoes. Therefore if the mosquitoes develop high levels of resistance to these insecticides the public health i...

Bacteria play role in preventing spread of malaria

...ria, or microbial flora, with antibiotics made the mosquitoes more susceptible to Plasmodium infection because... "Our study suggests that the microbial flora of mosquitoes is stimulating immune activity that protects the m...for the transmission of malaria in the field where mosquitoes may be exposed to different types of bacteria in d...

Penn State entomologists seek fungus to blunt mosquitoes' sense of smell

... is looking for an insect disease that will infect mosquitoes and impair their sense of smell. Supported by a ...insect pathogenic fungi. "We will infect malaria mosquitoes with an insect-specific fungus to determine how mu... human hosts and transmit malaria," said Thomas. mosquitoes transfer malaria parasites to humans when the fema...

Visualizing virus replication in three dimensions

... Dengue fever is the most common infectious disease transmitted by mosquitoes some 100 million people around the world are infected. Researchers at the Hygiene Institute at Heidelberg University Hospital were the first to prese...

Mosquito parasite may help fight dengue fever

...ms have to convince international governments that mosquitoes carrying the Wolbachia parasite could successfully...n takes hold. Working with uninfected and infected mosquitoes produced by Conor McMeniman, Oliver Evans and Eric...Williams to film the activities of male and female mosquitoes as they aged to find how the bacteria affected the...

DNA barcoding of mosquito species deployed in bid to end elephantiasis

...ifficult for the body to fight germs and infections. Poor sanitation and rapid growth in tropical and subtropical areas has created more places for mosquitoes to breed and thus to more LF infection. World health authorities have earmarked the disease for eradication by 2020 through mass drug administratio...

UC Riverside professor receives top scientific honor

...ts include being among pioneers of genetic engineering of disease-resistant mosquitoes for the purpose of mosquito control. Raikhel has deciphered in great mol... detail a chemical chain reaction and genes which prompts disease-spreading mosquitoes to produce and mature their eggs. Manipulation of this process may be key t...

Malaria immunity trigger found for multiple mosquito species

... of the caspar gene through the manipulation of gene expression resulted in mosquitoes that successfully blocked the development of Plasmodium falciparum in the...ic modification. Furthermore, by activating Rel 2, the genetically modified mosquitoes will attack the malaria parasite with several independent immune factors, a...

Eugene-Springfield face Upper Willamette climate threats

... raising rates of asthma and other respiratory problems. Increasing temperatures will mean more risk from insect-borne diseases such as West Nile from mosquitoes and Lyme disease from ticks, as well as the risk of increased heat stroke and cardiovascular problems, especially for people without access to air con...

Study predicts when invasive species can travel more readily by air

...said it can be a combination of goods transport and people bringing things aboard either accidentally or knowingly. "Some studies have shown that mosquitoes can fly on randomly, or they may get into baggage," he said. "But some things, like plant pathogens, happen when people purposely bring fruit aboard, ...

Researchers examine role of climate change in disease spread

...e picked prominent examples and asked how much is climate change a factor in these emergences?" Since the viruses in question are carried either by mosquitoes (West Nile, Chikungunya, Rift Valley fever) or midges (Bluetongue), creatures whose activity and population increase in warm, moist environments, one ...

A natural, alternative insect repellent to DEET

...lsamifera ) of South America, has been found to effectively deter biting of mosquitoes and to repel ticks, both of which are known spreaders of diseases such as m...toes." The authors found that isolongifolenone deters the biting of the mosquitoes Aedes aegypti (L.) and Anopheles stephensi Liston more effectively than the...

Hoarding rainwater could 'dramatically' expand range of dengue-fever mosquito

...e disease risk into the future. Our results highlight that dengue-vectoring mosquitoes can spread to areas where they are currently not found once suitable breedi...t the model, Kearney and his colleagues needed to predict the microclimates mosquitoes experience. "Like all mosquitoes, the dengue mosquito has an aquatic larval...

Common soil mineral degrades the nearly indestructible prion

...rsen explains, are likely critical links in the chain of infection because the agent does not appear to depend on vectors intermediate organisms like mosquitoes or ticks to spread from animal to animal. That the birnessite family of minerals possessed the capacity to degrade prions was a surprise, Pedersen s...

Mosquitoes create harmonic love song before mating, study finds

...entomologists have discovered that male and female mosquitoes (Aedes aegypti), which can spread such diseases as...pper hearing limit," he added. Interestingly, the mosquitoes adjust the harmonic resonance of their thoracic bo...ely show that contrary to previous thought, female mosquitoes are not deaf. To study mosquito mating calls, the...

African thicket rat malaria linked to virulent human form

...eichenowi ,. This is interesting and surprising because the parasite found in African thicket ratsthe only malarial parasite to be discovered first in mosquitoes and only later in a vertebrate hostis the most common laboratory model for human malarial research. The ,P. falciparum ,-rodent group is most closely...

West Nile's North American spread described

...how temperature, precipitation, and changing landscapes interact in fostering outbreaks. Research on how these factors affect susceptible wildlife and mosquitoes could lead to better predictions and possibly public warnings and expanded mosquito abatement programs in vulnerable areas. ...

UC Davis chemical ecologist wins major award

... The Leal lab unveiled DEET's mode of action on Aug. 18. Contrary to previous hypotheses, DEET doesn't jam the senses or mask the smell of the host; mosquitoes smell the repellent directly and avoid it. Under his tenure as chair, the UC Davis Department of Entomology was ranked last November as the No. 1 d...

Study: Bird diversity lessens human exposure to West Nile Virus

...he virus. Where many bird species exist, very few mosquitoes get infected, and so we humans are at low risk. A... being around humans and it's relatively easy for mosquitoes to take their blood meals from them because robins...by the Center for Disease Control, they tested the mosquitoes and found three positive pools. "The infection r...

Entomological Society of America names 2008 award winners

...sn't jam the senses or mask the smell of the host; mosquitoes smell the repellent directly and avoid it. Dr. ...t address regional differences in phenology of two mosquitoes of public-health importance, Culex tarsalis and th...nt larval habitat on the abundance of adult female mosquitoes and the relationship between vector abundance and ...

New way to make malaria medicine also first step in finding new antibiotics

...on cases led to nearly 881,000 deaths in 2006." Resistance to classic drugs such as chloroquine and sulphadoxine-pyrimethamine is on the rise, and mosquitoes also are developing resistance to insecticides. "In my opinion malaria is the biggest single infectious disease problem in the world," Metcalf sa...

No more big stink: scent lures mosquitoes, but humans can't smell it

...t, easy-to-prepare attractant that lures blood-fed mosquitoes without making humans hold their noses. The syn...nonanal in low doses, is just as enticing to Culex mosquitoes as the current attractants, Leal said, but this on... Oviposition or gravid female traps draw blood-fed mosquitoes ready to lay their eggs, but the chemical- and wat...

Ayurvedic nightshade deadly for dengue mosquito

... mosquitoes responsible for spreading disease are increasingly... villosum (S villosum), have potential for keeping mosquitoes at bay. S. villosum is a member of the nightsha... the potential for use in stagnant water where the mosquitoes breed. The next step is to identify the active com...

The Uukuniemi virus helps to explain the infection mechanism of bunyaviruses

...ause serious disease, such as hemorrhagic fever and encephalitis, for which no vaccines are available yet. Most of the bunyaviruses are transmitted by mosquitoes and ticks. The exception is hantaviruses, which belong to the Bunyaviridae family, and which are spread by voles and other rodents. ...

Stanford researchers say climate change will significantly increase impending bird extinctions

...dditional threats include interactions between the rising temperatures and other environmental factors. For example, as Hawaiian mountains get warmer, mosquitoes carrying avian malaria, to which most native bird species have no immunity, are moving upslope, invading the last refuges of birds already on the brin...

Selfish DNA and the Genetic Control of Vector-Borne Diseases

... mosquitoes. Scientists have introduced genes into mosquitoes that render them unable to carry the human pathoge...le. However, releasing these genetically modified mosquitoes into wild populations would not change the rate of...gen transmission, it is critical that the modified mosquitoes supplant the wild population. Population genetics...

USDA Cooperative Agreement funds mosquito project at Rutgers

...ion to being a potential vector of debilitating epidemics, it is also regarded as the most significant nuisance mosquito across its range. Asian tiger mosquitoes are aggressive day-biters that cause skin problems and allergic reactions. They thrive in artificial containers, particularly in urban areas where hum...
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