Tag: "medium" at biology news

Leibniz Prize winners 2003

...s a result of his activities with what is known as medium curvature flow. Since that time he has constantly been at the forefront of research in this area. The theory of surface evolution developed by Gerhard Huisken not only leads to an understanding of the processes taking place with the passage of time,...

Speedy elephants use a biomechanical trick to 'run' like Groucho

...al quadrupeds use a walk at slow speeds, a trot at medium speeds and a gallop at fast speeds. In the footfall pattern of a trot, diagonal limbs contact the ground at the same time. "So a quadruped goes left hind, right front together and then right hind, left front together," Hutchinson explained. "It's act...

Ecowar looming with sunken wartime wrecks

...an initial categorisation of the wrecks into high, medium and low-pollution risk. Working out which wrecks are the biggest threats is key. In deep enough waters, the lack of oxygen means corrosion all but grinds to a halt and small oil leaks could be broken down naturally. "There isn't a huge amount of oil...

Why we are what we eat: New links between our biology and food choices

... fat intake. The genes responsible for nontasting, medium tasting, and supertasting may have emerged during evolution because they provided each group with certain health advantages, related to their food preferences, Bartoshuk proposed. Evolutionary Trends in Diet Based on his investigations of the diet...

Chaos in the heart

...n be suppressed by weak periodic modulation of the medium excitability. If verified for the heart, this discovery could lead to new methods for terminating cardiac fibrillation. An electric excitation wave runs through the heart and causes it to contract once every second. Sometimes, however, the ordered wa...

Gene responsible for anemia (type CDA-1) discovered

...lood cell formation. CDA-1 is characterized by a medium to high deficiency in blood production, and in critical cases patients must receive blood transfusions throughout their lifetime. It is a rare disease present worldwide, but the largest vulnerable group is the Negev Desert's Bedouin population, where...

First potentially clinically useful independent marker for lung cancer identified

...ed at survival in three groups patients with low, medium or high levels of ERCC1 and found that median surv...se with low levels, about 62 months for those with medium levels and about 94 months for those with high levels. "This was not the result we expected," he sai...

Planting time for forest trees branches out to new seasons

... moment of planting, then planted with the potting medium intact around the roots isn't as shocking to the transplants, according to Dr. Mike Messina, Experiment Station forest scientist. "Planting earlier is proving to be a good idea, because they do get a better start," Messina said. "The containerized p...

Scientists find grass yield, carbon storage not affected by creepy-crawlies in the soil

...d in their body sizes- treatments contained small, medium or large soil fauna. The experiment ran for nine months, during which seasonal conditions were set to mimic June/July temperatures in Scotland - akin to a continuous growing season. The researchers had their expectations, based on previous, simpler e...

Rice bioengineers develop method to grow 3-D bone matrix

...esh. The samples were covered with a liquid growth medium -- a bath of chemicals that promotes bone growth -... themselves to the mesh -- engineers pumped growth medium through the cultures for 16 days. Bone cultures were subjected to a range of three different flow ra...

Colorado U. to fly hardware, experiments on space shuttle, space station

...heavier kidney cells settling to the bottom of the medium and growing in two-dimensional sheets, culturing them in the suspended state of microgravity causes their behavior to mimic normal, functioning kidney cells. Previous BioServe flights have documented changes in kidney cells and how the genes are exp...

Drinking through your pelvic region?

...othesis that the presence of NaCl in the hydration medium enhances red cell velocity and water absorption; and (3) investigating whether or not: (a) red cell velocity is greater in toads with empty bladders, (b) forced hydration reduces red cell velocity and (c) angiotensin stimulates red cell velocity in t...

Scientists use alfalfa plants to harvest nanoparticles of gold

...ral, physiological need to extract metals from the medium in which they are growing. Of most value here is that the alfalfa extracts gold from the medium and stores it in the form of nanoparticles - specks of gold less than a billionth of a meter across....

New metabolic 'switches' discovered

...at extend away from the colony and into the growth medium to forage for nutrients. G proteins are"heterotrimeric" complexes, meaningthat they are composed of three different subunit proteins, called alpha, beta, and gamma -- each of which plays a role in the transmission of the metabolic signal to the cell'...

Healthy dessert: 'peaches and phytochemicals'

...Byrne, whose breeding selection process focuses on medium chill (350-550 hours) to low chill (under 350 hour...ew varieties offer. TexKing and TexPrince both are medium chill varieties needing only 450-550 chill hours. TexKing has an early ripening season whereas TexPr...

Tips from the Journals of the American Society for Microbiology

...sed by varying levels of UV radiation from low and medium pressure lamps. They found that while E.coli was able to fully repair damage done to its DNA after being subjected to low-pressure UV rays, they remain unclear as to the effects of medium-pressure rays. "The results of this study show that polychrom...

Study: Higher energy intake, obesity affects all age groups, not just youths

...s, candy, french fries, hamburgers, pizza, low and medium fat milk products and meats and hot dogs, she said. Among our findings were that even though the two younger age groups were consuming more of these high-energy foods like french fries and burgers, they were still eating them in the same proportion t...

Study suggests global extinction crisis more serious than previously thought

...rs examined evidence for population extinctions in medium and large-sized mammals. Because of the diversity and variety of habitats mammals exploit, they can serve as an indicator of what is happening globally to animals and plants, said Ehrlich, the Bing Professor of Population Studies in Stanfords Departm...

Obesity may exacerbate a heart disorder in African American females

...bjects who engaged in low (0.0 - 9.9 MET-hr/week), medium (10.0 - 35. 0 MET-hr/week) and high (>35 MET-hr/week) PA and ANOVA analyses completed to determine if PA significantly affected QTc duration. Results Significantly longer QTc and significantly higher systolic and diastolic blood pressure value...

Tomato ripening gene could make store tomatoes tastier

...ing process, creating tomatoes that ripen at fast, medium or slow speeds. Using a procedure called "antisense," the researchers take the rin gene and invert it. This effectively shuts off the normal gene and, in this case, slows the tomato's ripening process. The procedure, says Giovannoni, also should ...

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