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Tag: "experiment" at biology news

Rhesus monkeys can assess the visual perspective of others when competing for food

...he other stood facing the subject. Monkeys in this experiment spontaneously chose to approach and steal a grape from only the competitor with his back toward the monkey. In five more experiments, the monkeys revealed similar preferences for an experimenter who could not see them, rather than one who could. Most...

Science study holds implications for gene therapy and stem cell biology

...e models." Dr. Baum said. Scientists, in general, experiment with related gene vectors to treat severe inborn disorders or cancer. There continues to be an increasing interest in gene therapy research with blood stem cells because these cells can be extracted and manipulated and then reinserted to repopulate t...

Remote control flies? Fly behavior controlled by laser light

...enböck says one of the most difficult parts of the experiment was deciding which particular nerve cells to target with the remote control system. "To ascertain that the system actually worked, it wasn't clear how we could measure activation in the neurons in moving, freely behaving organisms," he explains. The...

Chemical Engineer Kao Explores Antibiotic Synthesis With DNA Chips

...orescent dye and applied to the microarray. "This experiment revealed that the RNA transcript abundance of the erythromycin-producing genes remained higher for longer times in the Saccharopolyspora erythraea mutant strain," Kao said. Searching for mutations When researchers reveal how mutants overproduce ant...

Natural Killers Could Lead to New Hepatitis Treatments

...opping. The chemical the researchers used in their experiment is a general immune activator and does not reflect what occurs during an actual infection, he noted. Such knowledge would offer important insights into the mechanism of inflammation and liver damage due to infections, he said. ...

U. Iowa researchers improve Huntington's disease symptoms in mice

...ce our results are positive, we can now repeat the experiment in mouse models that develop disease more slowly and more closely resemble HD in humans," Davidson said. Most genes are inherited as a pair, one from either parent. In HD, one mutated copy of the gene is sufficient to cause the disease. However, the...

Second messenger NAADP shows fast, dose-related impact on satiety cycle

.... In conclusion, Yamasaki said, "Our data in this experiment provides the first direct evidence that cholecystokinin elicits a rapid, dose-dependent and selective increase in NAADP, and thus unequivocal evidence that NAADP is a crucial messenger employed by cholecystokinin." Yamasaki noted that NAADP has "a s...

Life detection instrument passes key test on road to Mars

...and people thought I was crazy to be working on an experiment to detect life on Mars," Skelley said. "I feel vin...e right position at the right time to do the right experiment to find life on Mars." Mathies said that his experiment is the only one proposed for ExoMars or the...

Roundup®highly lethal to amphibians, finds University of Pittsburgh researcher

...s, is "extremely lethal" to amphibians. This field experiment is one of the most extensive studies on the effect... over the bottom." Relyea initially conducted the experiment to see whether the Roundup® would have an indirect effect on the frogs by killing their food source,...

Certain fish have a special mating preference

...ish from both environments and ran a common-garden experiment ?in which all environmental factors are the same for all individuals ?in laboratory aquaria. He found that gonopodia size was larger in the lab for the offspring of parents collected in predator-free environments ?just as in the field ?proving herita...

IMF Launches World’s First DNA Database for Myeloma Patients

...ish from both environments and ran a common-garden experiment ?in which all environmental factors are the same for all individuals ?in laboratory aquaria. He found that gonopodia size was larger in the lab for the offspring of parents collected in predator-free environments ?just as in the field ?proving herita...

Researchers discover mechanism for multiplying adult stem cells

... without having it form mature liver tissue. This experiment showed that when Oct4 was reactivated, the adult stem cells in those tissues continued to replicate without forming mature tissue. In a mammal's body, this type of cell behavior causes tumors. But under the right laboratory conditions, it could be a ...

Study shows humans have ability to track odors, much like bloodhounds

...ion from smell." One key difference between their experiment and previous experiments to replicate the results of von B�k�sy is that Porter and Sobel asked their subjects to actively sniff, whereas many previous experiments prevented subjects from sniffing. "We think that most people failed to replicate his r...

Identification of specific genes predicts which patients will respond to Hepatitis C treatment

...idates for specific therapies. "We went into this experiment without any hypothesis about what to look for," said Aled Edwards, a Professor in the Banting and Best Department of Medical Research at University of Toronto with cross appointments in the Departments of Medical Biophysics and Medical Genetics and M...

Say what? Bacterial conversation stoppers

...es and consumes AI-2. In this study, she set up an experiment where multitudes of E. coli first produced then devoured enough AI-2 to dim the lights of the marine bacteria, essentially fooling the thriving oceanic gang into thinking its members were few, thereby terminating its quorum-sensing behaviors. In a...

Woods Hole Research Center plans controlled burn in Amazon rainforest

...ned by studying an accidental or escaped fire. The experiment is being conducted in an area in which researchers...available in the soil. According to Nepstad, "This experiment allows us to measure the impacts of recurring fire on the forest by comparing the trees, the animals...

New Scripps Oceanography project to study sediments and ecosystem restoration in Venice lagoon

... public works in Venice and elsewhere." The field experiment phase by SIOSED scientists will include sediment dredging and transplantation to build six 35-meter-long and 10-meter-wide subtidal banks inside the lagoon. The banks will allow the researchers to test how the chemical content and biodiversity of the...

Researchers devise new technique for creating human stem cells

...tem cells," he said. "The long term goal for this experiment was to do cell fusion in a way that would allow the elimination of the embryonic stem cell nucleus to create an embryonic stem cell from the somatic cell," said Melton. "This paper reports only the first step toward that goal, because we end up with ...

Gambling monkeys give insight into neural machinery of risk

...the monkeys preferred the risky target because the experiment was dull and boring, and they wanted the variability," said Platt. "But when we made the task more interesting by changing the color of the lights on each trial, the monkeys didn't care anything about it." In fact, when the researchers made the aver...

'Underground' tunnels discovered as means for communication between immune system cells

... the researchers anticipated that by repeating the experiment with macrophages there'd be no response. But as luck would have it, the microscopic bacteria sample somehow got clogged inside the tip, and before Dr. Watkins realized the need to pull away from the cell, he had already given it a jab. "On the scree...

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