Tag: "flow" at biology news
How roots control plant shoots
...hat is why when roots were cut off repeatedly, the flow
of growth-inhibiting hormone stopped and leaves grew normally. Van Norman believes the normal BPS1 gene exists because "plants are immobile organisms. They have to be able to sense their environment both above ground and below ground, and then resp...
Stanford cooling tool may improve performance of athletes, soldiers
... then we applied heat to the skin to increase heat flow
back to the core," Grahn says. "The effect was remarkable--we were able to rewarm people in 10 minutes, down from the typical recovery time of two hours." Grahn and Heller went on to develop new technology for treatment of chronic medical condit...
Good news: As you age, leg blood vessels adapt so you can still exercise without fainting
...our working muscle cells. The rapid rise in blood flow
to the periphery -- especially to the legs -- can ... systematically study the impact of aging on blood flow
to exercising muscle in healthy humans." It's important to study how healthy people age, he noted, ...
Viruses found in untreated city water
... "We know from our previous studies on groundwater flow
in La Crosse that some city wells have high levels of Mississippi River infiltration, other wells have intermediate levels and the remaining wells have little river water in them," Hunt said. "We also know that the Mississippi River is affected by up...
Muscle-building hand-grips aid systolic blood pressure, carotid AD, endothelial function
...tion (FMD). This technique involves stopping blood flow
to the forearm for 5 minutes then measuring the ar...ry's internal diameter with ultrasound after blood flow
is reintroduced. After training, systolic blood pressure decreased significantly, while FMD increase...
Botulism bug says no to nitric oxide, provides key to molecule's role in human cell signaling
...to make cyclic GMP, a molecule that improves blood flow
by relaxing blood vessel walls. Ferid Murad, M.D., Ph.D., professor and chairman of Integrative Biology and Pharmacology at the UT Medical School at Houston, won the Nobel prize for his 1977 finding that NO is the ingredient that makes nitroglyceri...
Genetic link to risky pregnancy
...le to do their job. The result is decreased blood flow
to the fetus, a situation that threatens both mother and developing child. The fetal cells charged with this important task, called trophoblast cells, must communicate with maternal immune cells known as natural killer (NK) cells. During these inte...
Touching research: How white blood cells navigate
...as shown how physical forces and patterns of blood flow
are crucial to the process. When the sticking process goes awry, disease occurs. Painful and harmful inflammation occurs when white cells are extremely active. Autoimmune diseases like diabetes, multiple sclerosis and lupus happen when our white blo...
Channel protein converts vibrations to electrical signal
... the channels. With lower levels of TRPA1, current flow
was diminished. In zebrafish embryos, they measured the voltage inside the developing ear, and found that this, too, was reduced when TRPA1 levels were low. Given the evidence that TRPA1 plays an integral role in the conversion of a mechanical stimu...
Coke versus Pepsi: It's all in the head
...fields and radio signals are used to measure blood flow
in regions of the brain, with such flow
indicating brain activity levels.In the experiments, the sips were preceded by either "anonymous" cu...
Laboratory test of evolutionary theory confirms importance of links between populations
...ides the first direct empirical evidence that gene flow
across a heterogeneous landscape can alter the dyn... the fragments are isolated and when there is gene flow
between fragments," Forde said. In the isolated communities, resistant bacteria--and viruses able t...
Delay in cutting the cord helps premature babies
...d from the placenta passes to the baby to help the flow
of blood to the baby's lungs," Rabe explains. "Delaying cord clamping for just a very short time helped the babies to adjust to their new surroundings better." The review appears in the October issue of the Cochrane Collaboration, an international or...
UCSD medical researchers use brain cell transplants to correct muscle spasms after aneurysm surgery
...chemic spinal cord injury, caused by reduced blood flow
to the spinal cord, occurs in 20 to 40 percent of ...ng surgery is usually due to clamping of the blood flow
to the spinal cord, to permit repairs of the aorta, Marsala said. The loss of specialized spinal co...
IC-medtech licenses promising cancer therapeutic from Summa Health System
...Summers explained. "The dying cells undergo a new flow
of self-destruction in which the cell literally cuts itself into small pieces. This discovery was the first of its kind and to this point, cells were considered to die only by apoptosis (programmed cell death) or necrosis (toxic cell death or injury...
Evidence that learning is consolidated during sleep
...ositron emission tomography (PET) to measure blood flow
in the subjects' brain regions. In PET, test subje...ned as the tracer infuses through the brain. Blood flow
through specific brain structures constitutes a measure of activity in that structure. The researche...
Fat buildup found in hearts of obese or diabetic heart failure patients
... accumulating in the artery walls and blocking the flow
of blood to the heart. What we are finding now is that the buildup of fat doesn't stop in the blood vessels, it's actually worse in heart muscle cells," Taegtmeyer said. "We also report in this paper that diabetes and obesity appear to cause metabo...
UGA scientist Moran receives $2.6 million from Gordon and Betty Moore Foundation for marine research
...astal marshes. The bacteria also influence the flow
of sulfur-containing gases between the ocean and atmosphere. This flow
provides a key feedback loop in theories of global climate regulation for which biotic processes are...
Hurricane Ivan helps student study sinkholes
... up like a sponge, but that there are preferential flow
paths." Next, he will create a 3-D model by placing the electrodes in a grid, which will allow him to add the direction of water movement to his model. He combines the electrical resistivity measurements with a topographic map of the surface to creat...
New source for heart bypass replacement blood vessels: Fibrin-based TEVs
...nical strength (and) physiological levels of blood flow
and vasoreactivity," according to a paper publishe... allows blood vessels to adapt to changes in blood flow
rate. Transplanted TEVs produce new collagen, elastin Furthermore, after "a short time in culture,...
Genetically engineered corn poses no immediate threat to Mexican crops
...nsgenic or GM corn in Mexico. Concerns over gene flow
from transgenic corn to native Mexican varieties p... determine how transgene accumulation through gene flow
affects the fitness and yield of the plants receiving these transgenes. Educating Mexican citizens...
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