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Tag: "drops" at biology news

Studies to find better ways to preserve human eggs, ovarian tissue under way

...temperature one degree centigrade per minute so it drops the temperature very, very slowly,” says Dr. Song. Slow cooling works well for simple tissue, such as sperm or even embryos, and for blood. “In blood, for example, conventional cryopreservation freezes the liquid part but not the cells inside. Li...

Male-killing bacteria makes female butterflies more promiscuous

...he team found that when the male insect population drops -- killed off by the bacteria -- the female butterfly becomes more sexually rampant. Males on the other hand show signs of fatigue and put less effort into mating. In some populations of tropical butterfly the entire mating system is determined b...

Fascinating spider silk

...s relatively high, but within the spinning duct it drops to a slightly acidic level. No phase separation was observed for the synthetic spider protein when the pH was maintained at an alkaline level. At high pH, the normally uncharged tyrosine groups in the protein are deprotonated, which gives them a nega...

Smell may outlast other senses

...uch as sinusitis. However the ability to smell drops off much quicker in older people who were taking medications ?also an indicator of underlying health problems. Researcher Dr Amy Johnston, from Griffith University’s School of Nursing and Midwifery and the Eskitis Institute of Cell and Molecular B...

Iowa State University botanists identify new species of North American bamboo

...witch cane and river cane ?in an important way: It drops its leaves in the fall. "That's why it was recognized locally as being different," Clark said. "It's pretty uncommon for bamboos to drop their leaves." Clark should know. She's an internationally recognized bamboo expert. She had previously di...

Researchers develop technique for bacteria crowd control

... the concentration of microorganisms in tiny fluid drops and films. Unlike traditional centrifuging techniques, the new approach allows selective concentration of healthy cells," said Andrey Sokolov, Ph.D. student from Illinois Institute of Technology and contributor to the research. In addition to the...

Stem cell transplants explored at Stanford as a possible treatment for hearing loss

...which could be as simple as an application of ear drops - and stem cell transplantation into the inner ear to remedy hearing loss. Currently he's working on perfecting the steps toward eventual stem cell transplantation into humans, with the goal of first curing deafness in mice within the next five...

Cornell researcher helping develop quick, cheap HIV/AIDS test

...th HIV/AIDS, the number of circulating CD4 T-cells drops significantly," explains Baeumner. "If they get the appropriate retroviral treatment, their life span can be increased by many years. CD4 counts assist in the decisions on when to initiate and when to stop the treatment, which makes this test so impo...

New study aims to stop sepsis in its tracks

... things will go well. Only when the blood pressure drops or is no longer responsive to intravenous fluids does the team realize it is suddenly behind the eight ball. By then, the patient is quickly spiraling into multisystem organ failure. Starting resuscitation at this point may already be too late." To...

Artificial cornea offers better results for infants, some blind patients

...g. After the procedure patients use antibiotic eye drops each day for the rest of their lives to prevent infection. The current procedure is less invasive and cumbersome than some other efforts to implant artificial corneas. In the procedure carried out by Aquavella and other surgeons 30 years ago, phys...

Seals protect brain, conserve oxygen by turning off shivering response on icy dives

...gically programmed to shiver when body temperature drops below a certain "set-point." While breathing air, seals shiver just like other animals. But when they dive below the surface in frigid water, shivering is switched off, the study found. By shutting down the shivering response, a seal allows its...

Technology for monitoring fetal oxygen during labor offers no apparent benefit

... the tissues. The researchers theorized that such drops in heart rate might have been caused by inadvertent pressure on the umbilical cord when inserting the sensor, or because of manipulation of the baby's head. "In this study of more than 5000 women delivering at 14 university hospitals throughout th...

MIT engineers probe spiders' polymer art

...ed micro-rheometers-custom-made to handle the tiny drops of silk solution-to test the material's behavior w... aligned and the viscosity (or resistance to flow) drops by a factor of 500 or more. As the resulting liquid exits the abdomen through the spinneret, it h...

Ring-like formations in drying DNA drops could affect hybridization studies

...th the ring-shaped stains that result from spilled drops that have dried, in which the brown stain is not e...s found the same "coffee-ring" formation in drying drops of DNA. To gain insights into the physics behind the ring phenomenon, Wong's team experimentally st...

Study reveals how cells destroy faulty proteins in cystic fibrosis

...ts that specifically recognizes misshapen CFTR and drops it in the molecular trash bin. The team found that turning off these components ?the cell's trash collectors -- extends the life of faulty CFTR proteins and thereby enables some of it to assume a functional shape. The trash collectors newly ident...

Magnetism and mimicry of nature hold hope for better medicine, environmental safety

...ip.org/ . Digital magnetofluidics enables tiny drops of fluids to be manipulated on a silicon chip in w...new we had the perfect surface on which to analyze drops of blood and other biological fluids because the trapped air between the wires never allows for much...

Viagra improves high altitude exercise performance up to 45% for some

...iedlander said. The responders showed the greatest drops in stroke volume, cardiac output, and cycling performance between the sea level and high altitude trials without the drug. "Without sildenafil, their performance went down more than others," Friedlander said. "With it, it brought them back up to th...

Stanford/Packard scientist's data-mining technique strikes genetic gold

...o injury, and another gene in which the expression drops significantly in leukemic cells. They also confirmed these relationships by studying genes known to be associated with muscle tissue in both humans and mice. Their classification system was stymied, however, when scientists included too much or too ...

Attention shoppers: Researchers find neurons that encode the value of different goods

...nkey chose between one drop of grape juice and two drops of apple juice, etc. Behaviorally, Padoa-Schioppa ...he monkey might choose grape juice when one or two drops of apple juice were available. However, the monkey might be indifferent between the two juices when ...

Great (taste) expectations: Study shows brain anticipates taste, shifts gears

...subjects just prior to the administration of a few drops of liquid. But in the study, the cues would not always match the taste they were said to presage. His group observed that when subjects were given a cue that suggested the taste they were about to experience would be less bitter, the taste was perce...

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