'Auditory Scene Analysis' Helps Find Mates
...that constitute a kind of vocal pacemaker. Like a rhythm generator, the pacemaker tells the sound-generating muscles on the male's swim bladder to contract rhythmically and produce a hum averaging 100 Hz in frequency. In part of the midshipman female brain known as the midbrain (and humans have midbrains...Scientists Identify New Gene That Controls Sleep/Wake Cycle
...r shorter than 24 hours. In the fly, the circadian rhythm requires the pairing of two proteins, PER andTIM, made by the period ( per ) and timeless ( tim ) genes, respectively. All cellsof the fly have per and tim genes, but the brain cells set the body clock. PERand TIM proteins accumulate in the nucl......espond to temperature changes and adapt to control rhythm over a wide span. Light had previously been thought to be the dominant signal in every organism. These studies suggest that this is almost certainly not the case, and that for many biologically and agriculturally important organisms temperature and...Glowing Cyanobacteria Gives Researchers New Clues To Circadian Rhythms
... To identify genes involved in the circadian rhythm process, theresearchers used a gene for a bioluminescent enzyme to indicate the activity ofanother gene that they knew the circadian clock controlled. Whenever thecircadian clock was working, the cell made bioluminescent proteinsrhythmically-causing...... AF is caused by a disruption in the rhythm of the atria, theheart's upper two chambers. It causes an irregular heartbeat that results inthe heart pumping blood less effectively. About 2 million Americans have AF,according to an editorial in Circulation: Journal of the American HeartAssociat...Nuts And Oats May Build A Strong Heart
...nent of nuts, may protect theheart by preventing a rhythm disturbance called ventricular fibrillation thatca..., itcannot pump blood unless shocked into a normal rhythm with an electrical devicecalled a defibrillator. Albert says previous studies in animals have hinte...UNC Researchers Develop New Way To Measure Acid Level Of Body Fluids
...olicchanges that occur and can predispose to heart rhythm disturbances such asventricular fibrillation and sudden death," he adds. In terms of pH in the human body, metabolic actions occur properly when fluidsare close to chemical neutrality ? neither too acid nor too alkaline. On a scaleof zero to 14, a pH...Two Brandeis Scientists Shed Light On The First Photoreceptor Known To Set Circadian Rhythms
... clocks -- which, left unfettered,mete out a daily rhythm of about 24.5 hours -- need daily resetting toaccurately regulate many rhythmic functions within the body. The two biologists authored back-to-back papers in the Nov. 25 issue ofCell. The Rosbash lab's paper principally characterizes the wil...Shedding Light On Circadian Rhythms
...explains howCRY1 and CRY 2 help regulate circadian rhythm in plants. In the May 26, 1998, issue of Proceedings of the National Academy of Sciences,Yasuhide Miyamoto and Sancar showed that cells in the mouse and human retinaexpress genes similar to those that code for plant cryptochromes. Takahashi,Sancar a...Researchers Discover Mechanism That Drives Daily Body Rhythms
...tand at a molecular level -- that is, how a bodily rhythm iscontrolled from the core clock loop," says Steven Reppert, professor ofpediatrics at MGH and Harvard Medical School. Xiaowei Jin and Lauren Shearman,who are both research fellows in pediatrics at MGH, are lead authors on the Cellpaper. The ...Researchers Determine Three Dimensional Structure Of Melatonin Producing Enzyme
...ase (HIOMT). AA-NAT appears to be the "melatonin rhythm enzyme,"because a large increase in the activity of AA-NAT is responsible for the highlevels of melatonin found in the brain and in the bloodstream at night. Similarly, low levels of melatonin formed during the day reflect low levels ofthis enzyme. ...Largest Acoustics Meeting In History Expected
...ormation about the role of a short note in a swing rhythm (5aMUb10). Observing arm motion, timing, and strikingforce in drummers, Sofia Dahl of the Royal Institute of echnology( sofia@speech.kth.se ) and a colleague studied how the drummers played differently depending upon the type of surface that was str...New Biomaterial May Replace Arteries, Knee Cartilage
...h elasticity and compliance thatit will pulsate in rhythm with the heart under normal physiological conditions. "When people touch samples of Salubria in its vascular graft (arteryreplacement) form, they describe it as noodle-like or similar to calamari(squid)," Ku said. " I think it feels very much...Treatment restores normal heart rhythm in patients
... electrical shock alone. Conversion to normalheart rhythm occurred in all 50 patients who received ibutilide...in whomelectrical shock alone failed, normal heart rhythm was restored when electricalshock was attempted again after the administration of ibutilide. Followi......g spells,seizures or even death from a fatal heart rhythm called ventricularfibrillation. Dr. Ackerman and his colleagues investigated the cause of death of the19-year-old woman because her death followed a near-drowning that had nosatisfactory explanation. She was athletic and a good swimmer, yet she d...Researchers identify unique circadian rhythm photoreceptor
...ntense, constant light causes the normal circadian rhythm to go into arrhythmia, to essentially go whacko," ...y starts to prove that dCRY is the major circadian rhythm photoreceptor in this organism because there are no other photoreceptors that can pick up the light ...... steps to intervene." An arrhythmia is an abnormal rhythm of the heart that can be fatal. An internal defib...e at risk for sudden death. It monitors the heart rhythm continuously and restores normal rhythm by delivering an electrical shock when it detects an arrhyth...Give it a thought -- and make it so
...light flashing on the television or stereo. If the rhythm matches the blinks of the stereo light, for instance, the computer knows the person is concentrating on the stereo and turns it on. A person doesn't even have to look directly at the stereo; as long as the object is in the field of view, it can be co...Mom may set your body clock, suggests Science research
...are fertilized. The gene's activity keeps the same rhythm as the animal develops. "These findings were quite a surprise. The current belief is that circadian rhythms need a developed brain, so they don't get started until later," said Vincent Laudet, a coauthor of the Science paper along with Franck Delau...TSRI scientists clone gene that regulates circadian rhythms in plants
... project, to help correlate the defect in the glow rhythm with a particular region of a plant chromosome. Once the clock gene, called TOC1, was identified, researchers borrowed another glow gene this one from a jellyfish and hooked it up to TOC1 to see where it works within cells. TOC1 was found in a m...