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Tag: "saliva" at biology news

The insect vector always bites twice

...ith the aim of identifying in the arthropod vector saliva the immunogenic proteins responsible. They called ...ly these proteins contained in an extract of total saliva of the culprit vector. This approach, based on the studies of malaria transmission by mosquitoes...

Fat overrides effects of vitamin C

...inly play a part. Nitrite, which is present in our saliva and is derived from nitrate in our diet, is thought to be a pre-carcinogen for gastric cancer. When it is swallowed and enters the acidic environment of the stomach, nitrite spontaneously forms nitrosating species able to convert a range of targets, ...

Wheat can fatally starve insect predators

...the insect, the larvae inject chemicals from their saliva into the plant that completely alter the wheat's physiology and growth. ...

Xylitol reduces risk of cavities

...of studies on children and adolescents, samples of saliva and plaque were examined. Among other findings, i... products that actively stimulate the secretion of saliva should be the first choice, such as chewing gum. About 6 g of xylitol per day is needed to counte...

Multiple malaria infection inhibits spread of parasite

... gland. The sporozoite can be transmitted with the saliva to a person if he/she is bitten by this mosquito. There the parasite reproduces rapidly and the person becomes ill. Immunity People who live in areas where malaria is prevalent, can develop a natural immunity that stops the development of th...

First biomarker for human sleepiness identified in fruit flies

...chemical marker linked to sleep loss, an enzyme in saliva known as amylase, which increases in activity when...Shaw decided to look in saliva. Easily accessible, saliva contains many of the substances found in blood and urine, making it an increasingly popular target f...

Successful lung cancer surgery not enough to break nicotine dependence in many smokers

...onths of their diagnosis - and it attempted to use saliva samples as well as questionnaires to gauge whether patients were smoking 3, 6, and 12 months after surgery. Investigators at Washington University and at the University of Texas M.D. Anderson Cancer Center enrolled 154 patients being treated for e...

Researchers examine why food tastes bad to chemotherapy recipients

...actions of volatile compounds in the mouth. Since saliva contains proteins and enzymes, it may have some effect in enhancing the metallic flavor. They will also use in-vitro experiments in order to conduct experiments at higher concentrations without endangering anyone, Dietrich added. Perception of taste...

Adults who go to bed lonely get stress hormone boost next morning

...ortisol levels were measured from small samples of saliva provided three times a day for three consecutive days. Study participants reported their feelings each night in a diary, and researchers looked at whether cortisol levels on a particular day were predicted by experiences the day before or were predic...

Transgenic goat's milk offers hope for tackling children's intestinal disease

...round Lysozyme is a protein found in the tears, saliva and milk of all mammals. It is found at high levels in human breast milk, however goat's milk contains only 0.06 percent as much lysozyme as does human milk. Lysozyme inhibits the growth of bacteria by destroying the bacterial cell wall, causing the ...

Movie spies on malaria parasite's sneaky behavior

... a complex life cycle. It passes from a mosquito's saliva to a human's blood, and then travels to the liver, where it infects and kills liver cells. After it leaves the liver, the parasite moves back into the bloodstream to infect and kill red blood cells. The rupturing of blood cells causes the worst sympt...

Blood test predicts success of quitting smoking using the nicotine patch

..., may eventually be performed non-invasively using saliva or urine samples. "The ultimate aim here is to distinguish smokers who are likely to benefit from a standard dose of nicotine patch from those who may need a higher dose patch or an alternative therapy in order to succeed in quitting," said lead rese...

Magnetism and mimicry of nature hold hope for better medicine, environmental safety

...yses of water and biological fluids ?blood, urine, saliva ?that require only miniscule amounts of fluids. A detailed explanation of the process is presented in an article published in the July 17 edition of Applied Physics Letters, a leading international journal reporting on significant new findings in p...

Mitochondrial DNA sequencing tool updated

... mitochondria in most cells. If you are screening saliva or other bodily fluids with a limited number of cells to analyze, mitochondrial DNA gives you more to work with and a better chance of detecting mutations that might be associated with a developing cancer." Dr. Maitra said that despite the origina...

Waking a sleeping virus

...he "kissing disease" because EBV is transmitted in saliva ?whose symptoms resemble that of a cold. But in rare cases activation of the virus also leads to EBV associated cancers, especially in people with immune deficiencies. Researchers have focused on ZEBRA because of its ability to activate so many gene...

Environmental tobacco smoke linked to behavior problems in children and pre-teens

...n by the body and can be measured in blood, urine, saliva and hair. It is considered the best available marker of environmental tobacco smoke exposure. Dr. Yolton found a relationship between cotinine levels and increases in acting out; increases in holding things in, often manifested by anxiety and depre...

Portable cocaine sensor developed at UC Santa Barbara

...int the new sensor detects cocaine in the blood or saliva to a degree of a few micromolars. This is equivalent to the concentration of cocaine that would result from dropping a kilogram of cocaine into an olympic-sized swimming pool. That concentration would be the equivalent of detecting three parts per mi...

Biologists Crack Genetic Code for Specialized Spider Silk

...ype of infection-fighting antibody found in tears, saliva and other secretions ?affects 1 in 600 people in the western world; CVID is less common but more severe. Both conditions result in a person being more susceptible to pneumonia and to recurring infections of the ear, sinus and gastrointestinal tract. ...

Agreement will speed research on microbicides for women

...ype of infection-fighting antibody found in tears, saliva and other secretions ?affects 1 in 600 people in the western world; CVID is less common but more severe. Both conditions result in a person being more susceptible to pneumonia and to recurring infections of the ear, sinus and gastrointestinal tract. ...

Defective Gene Linked to Two Inherited Immune Deficiencies

...ype of infection-fighting antibody found in tears, saliva and other secretions ?affects 1 in 600 people in the western world; CVID is less common but more severe. Both conditions result in a person being more susceptible to pneumonia and to recurring infections of the ear, sinus and gastrointestinal tract. ...

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