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Tag: "experiment" at biology news

Penn researchers replace organ in adult mice using 'single-parent' stem cells

...f genomic imprinting, McLaughlin's team created an experiment in which they would attempt to reconstitute the hematopoietic, or blood-producing, stem cells that were destroyed in mice exposed to radiation. The Penn researchers first created gynogenetic (egg-based) and androgenetic (sperm-based) embryonic stem ...

Global 'sunscreen' has likely thinned, report NASA scientists

...ISS research team conducted the most comprehensive experiment to date using computer simulations of Earth's 20th-century climate to investigate the dimming trend. The combined results from nine state-of-the-art climate models, including three from GISS, showed that due to increasing greenhouse gases and aerosol...

Erectile dysfunction in diabetes is due to selective defect in the brain

...NMDA mediated behavioral responses in normal rats; experiment two measured behavioral responses to NMDA or sodiu...donor in both control and diabetic rats; the third experiment observed the effect of diabetes on nNOS protein in the PVN; the fourth experiment measured NMDA medi...

Natural gut hormone offers hope for new obesity drug

...n that sense, they have provided us with a natural experiment that suggests that excess levels of PP over a long period are safe. It does not appear to raise blood pressure or heart rate, or any other obvious side effects." With funding from the Seeding Drug Discovery initiative, Professor Bloom and colleague...

Researchers create artificial enzyme that mimics the body's internal engine

...j, the new laboratory techniques developed in this experiment may have applications for research involving other enzymes. Understanding what makes CcO so efficient in reducing oxygen to water may even be useful to the study of fuel cells-very efficient power sources that convert chemical energy to electricity. ...

New study may show how to forestall a fatal, virus-caused immune-system meltdown

...l strain of the virus. “We can go in and design an experiment where we can start testing drugs that already have FDA approval,?Bowick said. “If we can go straight from discovery to drug candidates, that’s quite a big leap for us, and one that may be very helpful, since there’s really no incentive for drug compa...

Using brain scans, researchers find evidence for a two-stage model of human perceptual learning

...e changes, they were shown the cars from the first experiment while again being scanned, allowing the researchers to compare how training had enhanced the brain's ability to process car shapes. They found again that cars selectively activated an area in lateral occipital cortex, but that now neurons in that are...

A rarity among arachnids, whip spiders have a sociable family life

...hin minutes, they gathered back together. In one experiment conducted by Rayor and Rachel Walsh, A&S '05, when 7- to 9-month-old D. diadema were separated from their families and later returned to cages with either their own group or an unfamiliar group, they reacted more aggressively toward the new gro...

Noise echoes in cell communications

...ope to illustrate this phenomena. Unlike a physics experiment that can produce the same result after various attempts, in biology, one particular experiment can yield a multitude of outcomes. This randomness, however, isn't problematic, but a necessary f...

Scientists see DNA get 'sunburned' for the first time

...f chemical reactions in a living cell, and so this experiment did not allow them to see a cell sustain sunburn. This is, however, the first time anyone has observed the initial molecular events behind damage to DNA. Kohler thinks the results might make scientists attack the problem of UV damage in a new way....

Latent memory of cells comes to life

... inheritance ?different traits In the practical experiment molecular biologists used a mutant of a yeast cell...ecome either of a single sex or hermaphrodite. The experiment showed that a spontaneous change occurred in the yeast cells about every 2000 cell-generations. By ...

Scientists seek useful traits in wild cottons

...sistance, said Sheehan, who hopes to intensify her experiment in 2007. Raina King, a Texas Tech University graduate student, is working to develop 'cleaner' cottons that shed the small leaves (bracts) at the base of each boll a few days after flower blooms open. Determining whether this trait i...

Parasites' impact goes beyond host to affect ecosystem

...trematode would also be prevalent. A laboratory experiment confirmed Wood’s and Byers?hypothesis: snails infected with the parasite ate 40 percent less macroalgae than uninfected snails. In the field, where researchers measured the macroalgae in three types of bottomless cages -- with no snails (control), un...

Scientists identify prion's infectious secret

...out 10 percent of the prion. Tessier repeated this experiment with peptides and a prion taken from pathogenic fu...as temperature. For example, when he conducted the experiment at 4 degrees Celsius, the baker’s yeast recognition element switched on. At 37 degrees Celsius, the ...

Pistachios lower cholesterol, provide antioxidants

...a randomized, crossover design, controlled feeding experiment to test the effects of pistachios added to a heart healthy moderate-fat diet on cardiovascular disease risk factors. Controlled feeding experiments provide all the food eaten by study subjects for the duration of the study segment. Participants b...

HIVMA opposes The Gambia's unproven AIDS remedy

...y concerned that President Jammeh would recklessly experiment with his people’s lives." "We support the tireless efforts of African scientists, clinicians, and community health workers providing antiretroviral treatment to communities that are so deeply affected by this disease." Dr. Kuritzkes added. "We urg...

Common treatment for methamphetamine overdose may damage brain cells

...ne toxicity in the same model." The rats in the experiment were injected with either methamphetamine or a saline solution over a period of eight hours. When the rats were given haloperidol before and nearly halfway through the eight-hour period, Yamamoto and his colleagues noted more than a fivefold rise in ...

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