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Tag: "fibers" at biology news

Bioartificial kidney under study at MCG

...ls are grown into the walls of thousands of hollow fibers contained in a cartridge similar to those used for... With dialysis, a patient's blood runs through the fibers and a solution with the normal composition of electrolytes runs on the outside. Through osmosis, was...

DNA Recombination and Repair—A New Twist to RecA Function

...ns that use ATP to ferry intracellular cargo along fibers made of actin or tubulin proteins. The ATP-dependent assembly of actin or tubulin fibers itself can work as a motor: for instance, the march of white blood cells toward pathogens is powered...

Tiny scaffolding allows stem cells to become working fat cells

...t of polyethylene terephathalene (PET), or Dacron, fibers that served as scaffolding upon which new fat cell...ften absent in two-dimensional colonies. "The PET fibers are spun out onto a mat that resembles the intracellular matrix that bonds cells together in normal ...

DuPont's first biologically derived polymer receives global recognition

...cognition. The judging panel commented, "Chemical fibers can now be made with natural ingredients. This will reduce the dependency of traditional chemical fiber products on oil resources. It will be another bold attempt in the innovative use of renewable resources. Crops and plants are becoming the most re...

Fibril Shape Is The Basis Of Prion Strains And Cross-species Prion Infection

...ecies depends on the shape of the toxic threadlike fibers produced by the prion. Two studies on the topic appear in the 8 April issue of the journal Cell. Although research suggests that prions from one species rarely infect other species, some scientists believe the species barrier was breached when a ne...

Key mechanism in genetic inheritance during cell division identified

...ecognize and stay attached to microtubules, hollow fibers in the walls of biological cells that are responsi...thens the microtubules." Thousands of microtubule fibers are woven together to form a highly flexible cytoskeleton in biological cells that gives shape to ce...

Cerebral navigation: How do nerve fibers know what direction to grow in?

... appropriate locations in the brain and grow nerve fibers (axons) that connect to other nerve cells in an intricate network. Growth cones, structures in the tips of growing axons, are responsible for steering axons in the right direction, guided by a complex set of signals from cells they encounter along th...

Stem cell treatment improves mobility after spinal cord injury

...cks of myelin, the biological insulation for nerve fibers that is critical for maintenance of electrical conduction in the central nervous system. When myelin is stripped away through disease or injury, sensory and motor deficiencies result and, in some cases, paralysis can occur. The researchers injected ...

Combination therapy leads to partial recovery from spinal cord injury in rats

...romote the growth of new "insulation" around nerve fibers in the damaged spinal cords of rats, a new study s...es have shown that the loss of myelin around nerve fibers contributes to the impaired function after a spinal cord injury. However, until now it has not been ...

How monarch butterflies are wired for navigation

...cules, they were surprised to discover tiny neural fibers containing a key clock protein that connected with...culated that another such clock-related pathway of fibers they detected between two regions of the butterfly brain may play a role in regulating the insects' ...

Deep sleep short-circuits brain's grid of connectivity

...cross the brain, traveling along networks of nerve fibers to different cerebral destinations. But when the s...rve fibers. Cells transmit information along those fibers electrochemically. Anatomically, the fibers are analogous to the cables that computers use to share ...

Frog peptides block HIV in lab study

...cross the brain, traveling along networks of nerve fibers to different cerebral destinations. But when the s...rve fibers. Cells transmit information along those fibers electrochemically. Anatomically, the fibers are analogous to the cables that computers use to share ...

Investigating 'brain shrinkage' in alcoholics

...ansient, such as the shrinkage of dendrites, those fibers that allow neurons to "talk" with neighbouring neurons. "In experimental animals," he said, "these have been shown to grow and spread again after periods of abstinence ?weeks to months ?and have been accompanied by improved brain function. Structural...

Bitter or sweet? The same taste bud can tell the difference

...buds are really clusters of 50 to 100 cells. Nerve fibers connect each bud to the brain, but only a few of t... CCK may tell other cells ?those attached to nerve fibers that transmit messages to the brain ?that a bitter taste was on the tongue. In the current study, t...

Lance Armstrong through a physiological lens: hard training boosts muscle power 8%

... improved efficiency of ATP turnover within muscle fibers during contraction." (ATP, or adenosine triphospha...ght have increased his percentage of type I muscle fibers from 60% to 80%," the report said. "Interestingly, this magnitude of increase…is remarkably similar ...

Chemical 'band-aid' prevents heart failure in mice with muscular dystrophy

...ey are stretched. Yasuda's device uses microcarbon fibers stuck by electrostatic attraction to each end of a single cardiac myocyte. As the myocyte is stretched between the carbon fibers, a transmitter on one fiber measures the amount of stretch and a force transducer on the other fiber measures the contrac...

U of MN researchers reverse memory loss in mice

...rofibrillary tangles, which are tangled bundles of fibers in neurons, and amyloid deposits, a toxic build-up of plaque in the brain. The researchers found that even after the memory loss was regained in the mice, the tangles remained, and even increased in number. This suggests that the tangles are not a ca...

Why do aneurysms form? New studies suggest leading role for white blood cells

...rch explains. "Something happens to damage elastin fibers in the blood vessel wall and, for some reason, the immune system's normal healing response doesn't work. Something eats away at smooth muscle cells in the wall of the aorta until it starts to fall apart." Researchers have found that AAAs appear to b...

Naturally occurring asbestos linked to lung cancer

... characterize determinants of exposure to asbestos fibers among residents in areas with naturally occurring ...d more must be learned about the types and size of fibers in asbestos deposits, the types of human activities that disturb asbestos fibers and the determinant...

Unweaving amyloid fibers to solve prion puzzles

Amyloid fibers are best known as the plaque that gunks up neurons...s give us some fundamental insights in how amyloid fibers form," says Whitehead Member Susan Lindquist, lead scientist in the research team whose results will...

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