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Tag: "light" at biology news

New technique will produce a better chromosome map

...s map, first published in 1935, and generations of light and electron micrographs have yielded an imprecise...s for preparing polytene cells for viewing under a light microscope involve using a thumb, pencil, forceps or other instrument to maneuver and press the cell...

Researchers publish first marsupial genome sequence

...evolutionary origins of the human genome. It sheds light on the genetic differences between placental mammals, such as humans, mice and dogs, and marsupial mammals, such as opossums and kangaroos. "Marsupials are the closest living relatives of placental mammals. Because of this relationship, the oposs...

Sleepless for science: Flies show link between sleep, immune system in Stanford study

... mutant flies could be kept under exactly the same light and temperature conditions as the normal flies. They looked at flies that were defective in one of two genes, called "timeless" and "period". They found that the loss of either gene's function made the flies more sensitive to bacterial infections ...

Dinosaur hearing, listening to muscle noise, quieter cubicles

...aditional visual observations, and is shedding new light on the behavior of this still-mysterious class of killer whales. (3aAB4) THE SOUNDSCAPE OF MODERNITY Acoustical developments in the 20th century forever altered the sounds that U.S. residents heard and their ways of listening. Modern acoustica...

From the deep -- Researchers find new species of sea anemone

...ter understanding of deep-sea populations may shed light on how humans drive ecological change, whether it'...at sulfur to make energy, much like plants convert light into energy." Daly doesn't know much about A. pearseae beyond its physical description. She and G...

Danish researches solve virus puzzle

...searchers at the University of Copenhagen shed new light on this question. The research is a collaboration between molecular biologists and physicists. ”The molecular biologists have knowledge of how the cell functions and of the interplay between the intercellular parts, while the physicists have the exp...

Switching genes to overdrive improves muscular dystrophy symptoms in mice

...ns as a switch, or perhaps more accurately, like a light dimmer that increases or decreases the activity of genes under its control. Exercising a muscle raises PGC-1alpha levels, causing the formation of more mitochondria, the chemical power plants that create energy in cells. PGC-1alpha is also require...

To sleep, perchance to dream: New insight into melatonin production

...d). Normally, melatonin production is inhibited by light and enhanced by darkness, usually peaking in the middle of the night. Melatonin's expression pattern is mimicked by a protein called AANAT, which is a key enzyme in the melatonin biosynthesis pathway. Dr. Kim and colleagues uncovered the mechani...

Fast and slow -- How the spinal cord controls the speed of movement

...tions. Using this set up, they watched nerve cells light up as the animals moved at different speeds. While no one knows how this pattern relates to other vertebrates, the research opens a door toward basic understanding of the architecture and function of nerves in spinal cords. With regard to regenera...

Revealing the machinery underlying the 'plastic' juvenile brain

...earchers exposed the animals to episodes of normal light and analyzed the response in the genetic machinery of the visual cortex in each animal's brain. They found that the brains of the juvenile mice showed activation of specific genetic mechanisms that the adult brains did not. Specifically, the resea...

Discovery of 'master switch' for the communication process between chloroplast and nuclei of plants

...s when stresses such as drought, heat, salinity or light become too great on the organism. A research team that includes Shai Koussevitzky, a research associate in the University of Nevada, Reno’s College of Agriculture, Biotechnology and Natural Resources, as well as Ron Mittler, associate professor of ...

NIAID expands capability for influenza research and surveillance

... live bird markets in Hong Kong, which helped shed light on the natural history of flu viruses. Further, scientists conducted training courses in animal influenza surveillance, developed diagnostic tools to detect animal flu viruses, and generated viruses suitable for use in developing human influenza vacc...

Researchers wake up viruses inside tumors to image and then destroy cancers

... of which is the multiple myeloma drug Velcade ?to light up tumor viruses on a gamma camera. The technique ...hen could we use the FIAU tracer to make the cells light up," Pomper says. "So we were hoping to find a way to turn latent Epstein-Barr virus on in these can...

Fish extinctions alter critical nutrients in water, study shows

...ing Tanzania, Zaire, Zambia and Burundi, also shed light on the roles that surviving species might play in replacing the lost nutrients. In both ecosystems studied, when surviving species successfully picked up the slack in nutrient recycling left by an extinct species, nitrogen and phosphorus were maintai...

Scientists see DNA get 'sunburned' for the first time

...A at the moment the UV strikes the molecule. UV light excites the DNA molecule by adding energy, said Be...orption is based on the idea that molecules absorb light at specific wavelengths, and it allows researchers to study events that happen in less than a picose...

Researchers develop marker that identifies energy-producing centers in nerve cells

...t the University of Maryland School of Medicine to light up brain cells that are critical for the proper fu...s system. This fluorescent marker protein may shed light on brain cell defects believed to play a role in various neurological diseases. The researchers desc...

Tundra disappearing at rapid rate

...s trees absorb more sunlight than the tundra. This light energy is then re-emitted to the atmosphere as heat. This sets up a "positive feedback," the same process that is associated with the rapidly decaying Arctic ice cap. "These results are very relevant to the current debate surrounding climate chan...

Brain's reward circuit activity ebbs and flows with a woman's hormonal cycle

...Integrative Neuroimaging. "The study may also shed light on why women are more vulnerable to addictive drugs during the pre-ovulation phase of the cycle." Berman, Drs. Jean-Claude Dreher, Peter Schmidt and colleagues in the NIMH Intramural Research Program report on their functional magnetic resonance i...

Study suggests some drug resistance to influenza B medications

...ty, the resistant variants may be here to stay. In light of the recent observation that oseltamivir may be less effective against influenza B than against influenza A, an important concern is whether suboptimal dosing for these viruses will lead to increased selection of viruses with high-level resistance....

A 'traffic light' for neurons means 'go' for improving brain research

...ceivably, direct control of neuronal activity with light could someday become a therapy in itself. A neural traffic light To selectively take control of neurons, the researchers used a virus to insert genes for produci...

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