Tag: "pumping" at biology news
Artificial cell gets light-powered nanopump for calcium ions
... ions through a phospholipid membrane calcium ion pumping
that resembles various key cellular activities in ...n't pumps for calcium that work like ours, but the pumping
of calcium across membranes is a really important function in biology," Gust said. "In muscle functi...
University of Maryland research reveals true target of calcium channel blockers
... of a number of systems in the body, including the pumping
action of the heart and the contraction and relaxation of the smooth muscles that line blood vessel walls to regulate blood pressure. Too much tone or constriction can cause small arteries to narrow and increase their resistance to blood flow, leadin...
Abnormalities in cellular anchoring protein cause fatal heart syndrome
...of time from electrical stimulation of the heart's pumping
chambers to recharging to the next heartbeat -- is abnormally long in people with the disorder. A normal QT interval is from 0.38 to 0.44 seconds, but in people with LQTS, that period is delayed by up to 0.5 seconds. Many patients with the disorder n...
Mutation causes specific arrhythmia and sudden cardiac death
...of time from electrical stimulation of the heart's pumping
chambers to their recharging for the next heartbeat. In normal people, this interval ranges from 0.38 to 0.44 seconds. However, for people with LQTS, this period of recharging can be delayed up to 0.5 seconds, which put these patients at high risk fo...
Pacemaker therapy halves heart failure deaths
...rrect by stimulating the heart muscle to contract, pumping
blood to the body. Heart failure, which affects ne...ysfunction of the left ventricle, the heart's main pumping
chamber. Four studies of 1,634 patients were selected for analysis. The majority of patients were ...
Can carbon sequestration solve global warming?
...archers are also exploring the long-term impact of pumping
carbon into coal seams and brine fields. "We now have a much better understanding of what we think is going to happen," White said. "I think that with the proper research and the right resources, the problem areas can be overcome." The capture of ca...
Researchers pinpoint cause of inherited form of heart failure
...ckening of the left ventricular wall, reducing its pumping
ability. Dilated cardiomyopathy involves a stretch...g of the left ventricle, which reduces the heart's pumping
strength. In either case, the inherited heart defects often cause early death. When underlying mutat...
Growth factor shows promise in Parkinson's patients
MADISON - By pumping
a potent growth factor directly into the human brain, an international team of scientists and surgeons has demonstrated significant remediation of the debilitating symptoms of patients with Parkinson's disease. The study, a phase 1 clinical trial des...
Cincinnati engineering study finds clue to Bangladesh's poisoned water
used to grow rice during dry seasons is one of the culprits in what has been called "the worst case of natural contamination in human history," a study led by University of Cincinnati engineering professor Shafiqul Islam has shown. An article in a ...
Nitric oxide-like drug could revive a failing heart
...ric oxide treatments that only enhance part of the pumping
cycle." Heart failure, which prevents the heart from pumping
enough blood to the body, strikes an estimated 550,000 Americans each year. Heart attack, high bloo...
Deciphering how arteries contribute to hypertension
...of the arterial tissue that is slowly stretched by pumping
a special liquid against the back of the disc. The pressure of the liquid causes a bubble to form on the front of the disc. The shape of the resulting bubble helps the researchers determine details about the tissues' elasticity, strength, stiffness a...
A tiny pump promises big time performance
...ong's patent on the low-power, electrically driven pumping
device is one of the reasons the State University ...pless pump" because it lacks mechanical parts. The pumping
device is the size of a computer chip and could be fabricated at a scale comparable to an adult's fi...
Hydrothermal vent systems could have persisted millions of years, incubated life
...ne can imagine how such stable, long-lived systems pumping
out heat, minerals and organic compounds for millennia might improve the chances for life to spark and to be sustained until it could take hold, say these scientists. "It's difficult to know if life might have started as a result of one or both kind...
Natural hormone could reverse heart damage
...r hypertrophy (LVH), a condition in which the main pumping
chamber of the heart expands and stiffens, preventing proper blood flow to the body. Hypertrophy, which results from stress on the heart (for example, through high blood pressure or obesity), starts off as a compensatory mechanism but soon runs out ...
Potent toxin reveals new antibiotic resistance mechanism
...acteria have learned how to clean house by quickly pumping
antibiotic molecules out of affected cells. They also have acquired the trick of making molecular 'sponges,' proteins that bind to antibiotics and take the drugs out of the game before they can do their lethal work. The new mechanism found by Thorson...
Unique two-part macroemulsion offers new approach to cleaning up contaminated aquifers
...ediation techniques (pump and treat) often rely on pumping
large amounts of contaminated water out of the ground, flushing the pollutants with it. However, these techniques require large volumes of water and may need to be operated for many years. The cost of treating the contaminated water and the time re...
Inability to pump oxygen during exercise could pinpoint early heart problems
...ffecting millions of Americans could lead to heart pumping
disorders if left untreated. A new Johns Hopkins ...ients with problems of the left ventricle, or main pumping
chamber of the heart, by studying so-called oxygen pulse. During exercise, lungs take in air and tr...
Computer model offers new tool to probe Woburn toxic waste site
...er levels, variations in precipitation, changes in pumping
rates of wells G and H, binding of TCE and PCE onto organic matter in the aquifer, and estimates of the dumped masses of contaminants. In 2000, Metheny and Bair collected groundwater and dissolved gas samples from wells at the site, so Kip Solomon, a...
Genes control severity of heart failure, study finds
...es of DNA containing genes that modify the heart's pumping
ability and survival with the disease. The findings could point researchers to genes that determine the severity of heart failure in patients, according to the Duke team. "Our goal is to find novel genes that modify human heart failure by letting the...
Calcium channel involved in coronary artery relaxation
...ng its electrical properties, which keep the heart pumping
in rhythm. "The function of this channel is clearly very important for blood flow to the heart via the coronary artery," Campbell said. The team then explored how the absence of this calcium channel caused the relaxation defect. Another type of chann...
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