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Tag: "ratio" at biology news

Brightening prospects of using fluorescent nanotubes in medical applications

... merit for fluorescence is quantum efficiency: the ratio of the number of photons of light that a device emits to the number of photons it absorbs in the process. The VINSE team reports that they can produce populations containing trillions of nanotubes with a quantum efficiency of 1 percent, a factor of 1...

MU researchers to study the status of black bears in Missouri

...at DNA to estimate the number of bears, the gender ratio of male to female bears, where the bears are migrating from and if they are reproducing. “This study is a good example of the use of cutting-edge molecular biology in the management of Missouri’s wildlife,” Eggert said. “We’re pleased to work wit...

Gene responsible for common hearing loss identified for first time

...ining the data from both groups with a common odds ratio gave a very significant result, from which we were able to conclude that we were the first to identify a gene that influences the susceptibility for otosclerosis”, said Ms Thys. “And, as further evidence, we were also able to show that a more activ...

Hearts of male and female rainbow trout are different

...a proportionately larger epicardium to endocardium ratio compared with females with similar size hearts. Summary and Conclusions This study expands upon previous findings that sex differences in cardiac performance and metabolism exist in fish in general, and have now been found to occur in ra...

Alien plants attack using 'resource conservation' as weapon, researchers say

... to determine nutrient content. By calculating the ratio of resource use to the rate of photosynthesis, the scientists were able to determine the resource-use efficiency for each plant. "Invasive plants were more efficient on short-time scales, but overall there was no difference in the long term," Funk...

Female-led infanticide in wild chimpanzees

...hanges resulted in a highly skewed male:female sex ratio of 1:3, with relatively few males available to increase the home range. According to the authors, the new findings indicate that although low-level aggression between female chimpanzees is more commonly seen, the observed instances of infanticide ...

Dinosaur hearing, listening to muscle noise, quieter cubicles

...vocal resonances by training them to achieve a 1:6 ratio in the areas of two anatomical regions: the pharanx and the epilarynx. When a teacher provides verbal critiques on a student's singing performance, the information may be imprecisely stated, or misinterpreted by the student. Addressing this issue, Da...

New success in engineering plant oils

... "Scientists have known for a long time that the ratio of saturated to unsaturated fatty acids plays a ke...to adapt to different climates, but to change this ratio specifically in seed oils without changing the climate is an interesting challenge," remarked Shankl...

Male-killing bacteria makes female butterflies more promiscuous

...ale-killling bacteria so that each has a different ratio of males to females. The researchers assessed the natural sex ratio in 20 populations and combined this data with female mating frequency and the size of the male sperm...

The sturdier sex? -- Study by Pittsburgh scientists finds female stem cells work better

...y then calculated the regeneration index (RI) ?the ratio of dystrophin-positive fibers per 100,000 donor cells. Only one of the 10 male populations of implanted stem cells had an RI over 200. In contrast, 40 percent of the female stem cell populations had an RI higher than 200, and 60 percent of the female...

Pitt study notes decline in male births in the US and Japan

...or these trends. “The pattern of decline in the ratio of male to female births remains largely unexplain... over half in 1970. The study also examined the ratio of African-American male to female births to that of whites in the U.S. The researchers found that w...

Soft-cell approach cuts animal tests

...ost nanoparticles have a high surface area-to-mass ratio that can make the particles very reactive or catalytic. Being so small, they may also be able to pass through cell walls in organisms, and their reactions inside the body are relatively unknown. "These tiny new substances are the tip of a huge ch...

Is there a pilot in the insect?

... By definition, this angular speed is equal to the ratio of the horizontal speed and the altitude. What th..., this reflex will make it change altitude so that ratio remains constant. Adjusting the speed/altitude ratio means that the insect has no need to measure ei...

Common blood test can help distinguish between mononucleosis and tonsillitis

Measuring a patient's ratio of white blood cell types may help physicians accu...r microliter vs. 1,590 cells per microliter). The ratio of lymphocyte/white blood cell count ratio averaged .54 in the mononucleosis group and .10 in the to...

Computer imaging assists with facial reconstructive surgery

... patients, the porion to pogonion distance and the ratio of the distance between the pupil and the pogonion and the distance between the porion and the pogonion increased, the cervicomental angle decreased, the mentocervical angle decreased and the facial convexity angle increased after surgery. These cha...

Active ingredient in common Chinese herb shown to reduce hypertension

...dilation, indicated by the increased agent/control ratio of arteriolar diameters from 1.0 to 1.25¡À0.08 and...r cheek pouch. The increase in arteriolar diameter ratio was significant relative to the vehicle for each concentration as well as for comparison between the...

Bird sex is something else

...re dosage compensation meant that the male: female ratio of X-linked genes is similar to that of autosomal genes. In mammals, mismatched doses of X genes between males and females threaten to upset the gene network in one or both sexes. Fruit flies (Drosophila), roundworms (C. elegans) and humans each w...

Prehistoric mystery organism verified as giant fungus

...ven type of plant will typically contain a similar ratio of carbon-12 to carbon-13 as another plant of the ...ototaxites displayed a much wider variation in its ratio of carbon-12 to carbon-13 content than would be expected in any plant. Geological processes can a...

Drug treatment improves learning in mice with Down syndrome symptoms, Stanford/Packard study shows

...tter called GABA. Normal brains maintain a precise ratio between neuronal excitation and inhibition that allows efficient learning. In contrast, it’s thought that Down syndrome patients have too much GABA-related inhibition, making it difficult to process information. "In general, learning involves neur...

A buffet for early human relatives

...e analyzed in a mass spectrometer to determine the ratio of rare carbon-13 to common carbon-12. "The pr...t You Eat If the sample has a relatively high ratio of carbon-13 to carbon-12, it means the early human relative was eating a diet rich in C4 plants mos...

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