Tag: "voltage" at biology news
Bacterial Toxin Surprises Scientists
...ht that similar channels, which respond to voltage
changes in the membrane, open and close due to a subtle rearrangement of a few amino acids. Never before has anyone seen such a large portion of protein cross to the opposite side of a membrane to open a channel. This protein ...
Cell-Membrane Proteins Appear To Play Key Role In Squid's Swiftness
...sare much slower in non-squid mollusks in a normal voltage
range in intact,living nerve cells. At extreme voltages, the rates are similar. The workwas funded by National Institutes of Health and a Ford Foundation fellowship. Gilly, who studies membrane-channel proteins in the signaling of nerveand muscle ce...
COGA Suggests Genetic Loci For P3 Brain Wave Abnormality
...ant stimuli. Previous studies repeatedly found P3 voltage
to be low in several clinical conditions including...lcoholism, researchers initially attributed low P3 voltage
to the cumulative toxic effects of alcohol, Drs. Begleiter and Porjesz in 1985 demonstrated that P3 ...
Ionotropic Glutamate Receptors Share Tetrameric Structure With The Voltage GatedPotassium Channel
... tetrameric structure, similar to most voltage
dependent channels. The finding that...finding similar behavior on other ligand-gated and voltage
gated channels. This international group continues its collaboration to understand in m...
(Blue) Light At The End Of The Tunnel?
...es inredox status as affected by light, oxygen, or voltage
(hence LOV). Inthe plant, NPH1 becomes phosphorylated (phosphate groups areadded to the protein) on exposure to blue light; this reaction is oneof the earliest biochemical steps in phototropism. In this study, theresearchers expressed the NPH1 gene i...
New electrical transformers will improve power quality
...eavy loads in one user's appliances can reduce the voltage
for neighboring users and cause power outages. "Your neighbor directly impacts your power quality," Sudhoff says. Solid-state transformers would eliminate all such power-quality problems. They also would reduce the amount of current actually required...
Rotational motion detected in gates controlling nerve impulses
...the Dec.16 issue of Nature, the amino acids in the voltage
sensor move like keys turning in locks, not like t...open and close like little gates, depending on the voltage
across the membrane, and therefore control the generation and propagation of nerve impulses." Becaus...
Powering the seafloor
...S Department of Defense, which taps into a natural voltage
gradient at the bottom of the ocean. Bugs living... an electrical potential difference, just like the voltage
between opposite electrodes of a battery. Clare Reimers at Oregon State University in Corvallis and ...
Northwestern researchers clone gene responsible for inner ear motor
...d, the incoming sound stimulus produces electrical voltage
changes in the outer hair cells that drive the prestin motor. Unlike prestin, the functioning of the other biological motors, kinesin, dynein and myosin, do require ATP, the major energy molecule found in cells. In the hunt for the gene responsib...
UNC-Duke Scientists develop interactive learning tool simulating nerve function
...xtbooks, the simulator displays movies of changing voltage
patterns at each point throughout a nerve cell. "...ents a natural way to envision what's happening to voltage
or current patterns under an almost infinite variety of conditions," says Ann E. Stuart, Ph.D., prof...
Why some people just can't seem to pay attention
...t-related brain potentials (ERPs), which are small voltage
changes measured in microvolts. Participants were asked to discriminate between two tones of different durations in a measured reaction-time task, and to ignore occasional, varied frequency changes in the same tones. ERPs, EEG changes related to th...
Potent new compound from blue-green algae may help treat, elucidate nerve disorders
...s. These pores within the membranes of neurons are voltage
gates, he explained, the primary means by which neurons build up electrical charge. Kalkitoxin appears to block sodium channels, preventing the nerve cells from firing off their electrical signals. Interestingly, drugs such as topiramate help sup...
Nanopore detector shows discriminating taste in DNA molecules
...ough for a single strand of DNA to pass through. A voltage
applied across the membrane generates an ionic current and pulls the negatively charged DNA molecules through the pore. A characteristic decrease in the current occurs when a DNA molecule temporarily blocks the opening. Deamer's lab has been working...
Electrophysiological differences of individuals at high risk for alcoholism
... (ERPs) are brain responses that manifest as small voltage
changes that can be measured in microvolts. ERPs consist of positive and negative waves that are linked in time to specific sensory or cognitive events, and are extremely sensitive within a fraction of a second to ongoing processing in the brain. M...
UC Berkeley chemists detail secrets of ionization, reasons behind water's central role in chemistry of life
...ton gradient across a membrane, and the electrical voltage
associated with that, is what drives all life processes," Chandler said. This detailed picture comes from the team's calculations on what happens in pure water, which can be considered a weak acid, Chandler said. Water, or H2O, is composed of two hyd...
Report: Proteins can be engineered as widely adaptable 'bioelectronic' sensors
...to it a metal ruthenium group that would produce a voltage
when its conformation was altered. Thus, when they coated a gold electrode with the proteins and added maltose, that sugar altered the proteins' conformation, producing an electric current proportionate to the maltose concentration. To demonstrate t...
Spinach protein could offer new hope for the blind
... spinach protein that gives off a small electrical voltage
after capturing the energy of incoming photons. Th...means it produces the experimental equivalent of a voltage
when it comes into contact with light. A liposome will likely be used to deliver Photosystem I react...
UB biophysicists discover high-speed motility in cells in response to voltage changes
... have found that cells 'wiggle' at high speed when voltage
changes," said Frederick Sachs, Ph.D., UB professo.... "If you are going to study motion changes with voltage
of things imbedded in the cell membrane, you need to know the background movement," Sachs said. "If ...
Pictures reveal how nerve cells form connections to store short- and long-term memories in brain
...hich Colicos and his colleagues could apply a tiny voltage
below the chip to target the neuron. "We stimulate these cells with a short, high-frequency burst," says Colicos, working in Goda's lab. "That type of stimulation is what other researchers believed for many years was the type that formed these conne...
Ames Laboratory pursues new standard in sensor technology
... i.e., those that luminesce, or emit light, when a voltage
is applied. The University of Michigan researchers, led by chemist Raoul Kopelman, were interested in developing fluorescent sensors. The collaboration resulted in the creation of an integrated OLED/optical chemical sensor. "Integration a...
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