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Tag: "negative" at biology news

Environmental chemical cocktail may sabotage sperm

...en more potent, these results could have important negative implications for human fertility for two reasons. ... fertility. Other scientists have investigated the negative impact of environmental chemicals on testis function, resulting in reduced numbers of sperm being pr...

It's electric: Cows show promise as powerplants

...ial material that allowed protons to move from the negative (anode) chamber into the positive (cathode) chamber. This movement of protons, along with the movement of electrons across the resistor and wire that connects the two electrodes, creates electrical current. The anode chamber was filled with rumen fl...

Depression gene may weaken mood-regulating circuit

... depression* by weakening a circuit for processing negative emotion. People with the depression-linked gene variant showed less gray matter and weaker connections in the mood-regulating circuit. How well the circuit was connected accounted for nearly 30 percent of their anxious temperament, researchers at the...

Ocean climate predicts elk population in Canadian Rockies

...rchers are able to determine positive, average and negative NPO values. A positive NPO translates into a milder climate in most of western North America, but it means more severe weather in the mountain regions, where climate is more complex. Hebblewhite analyzed the elk population in Banff National Park fro...

Cancer related gene p53 not regulated as indicated by previous tissue culture research

...self might not be so important as modifications of negative regulators and co-activators." Many chemotherapeu...h the killing power of p53 by interfering with its negative regulators. Our cells are vulnerable to DNA breaks caused by UV light, ionizing radiation, toxic ch...

Major new UNC-based drinking water study suggests pregnancy fears may be overstated

...dividual and groups of chemicals that might have a negative effect on pregnancy," he said. "I don't want to do...serve to lessen concerns." Because of the overall negative results, he and his colleagues do not plan to make policy recommendations to water managers and muni...

Engineers improve plastic's potential for use in implants by linking it to biological material

...tach well to the plastic. Aspartic acid carries a negative charge, which in T59 appeared to be drawn to the positively charged surface of the polypyrrole the way magnets of opposite charges cling together. Yet other peptides containing aspartic acid didn't attach to polypyrrole, leading the researchers to sp...

UCLA study assesses cost-effectiveness of Hepatitis B drugs

...d life-year gained for patients with the e-antigen negative hepatitis B and would not be considered cost-effec...titis B -- either e- antigen positive or e-antigen negative -- which require different treatment approaches. Hepatitis B is the most common serious liver infec...

Purdue researchers use enzyme to clip 'DNA wires'

...ue. DNA, or deoxyribonucleic acid, has an overall negative charge, so it might be used in a process called self-assembly to create electronic devices. When placed in a solution with magnetic particles that have a positive charge, the particles are automatically attracted to the DNA strands, which act as tiny...

Retrovirus struck ancestors of chimpanzees and gorillas millions of years ago, but did not affect ancestral humans

...ciences and co-author of the study. "That can have negative effects. It's a double-whammy: the virus infected and possibly killed off some of the population, but also caused genetic errors in survivors. Those errors would have later eliminated more of the population." The virus had invaded the genome in the ...

Mouse with designer liver has enhanced glucose tolerance, insulin response

...and Akt proteins. "We propose that Gab1 acts as a negative regulator on insulin signal strength in the liver," said Dr. Feng. "In this work, by making a new liver-specific gene knockout mouse model, we found a novel balancing mechanism for control of liver insulin signaling. Our observation might be instrume...

Successful Test Of Single Molecule Switch Opens The Door To Biomolecular Electronics

...has created the first reproducible single molecule negative differential resistor ?and in the process has deve...icists have been trying to detect for a long time: negative differential resistance in a single molecule attached to electrodes. The specifically designed mole...

Report that delayed motherhood decreases life expectancy of mouse offspring

...children, are well known. However, other potential negative effects on offspring from delayed motherhood have been only anecdotal. In what the editors of Biology of Reproduction feel will be a controversial topic of discussion, a team of reproductive biologists headed by Juan Tarín at the Department of Pedia...

Elephant seal pups suffer from ocean warming

Ocean warming has a negative impact on the condition of elephant seals, reveals a study published in the Open Access journal BMC Biology. High ocean temperatures observed from 1975 to the late 1990s are correlated with a 28% decrease in the weight of elephant seal pups. Elephant...

NSAID drug protects against intestinal tumors in mice, despite poor diet and gene losses

...mice that had only one APC gene to p27 positive or negative mice, producing variants with no p27 genes or one or two. The APC gene is responsible for an inherited colorectal cancer condition known as FAP (familial adenomatous polyposis), in which patients develop hundreds of potentially precancerous polyps. ...

Defenseless plants arm themselves with metals

...f salicylic acid production, a phenomenon known as negative feedback. In this way, plants can turn the pathoge...accumulators like Thlaspi, however, don't show any negative effects from their constant exposure to high levels of salicylic acid. "These plants have tons of s...

Discovery may lead to better Candidiasis drug

...ting it from regulating its ions, the positive and negative charged molecules that move into, and out of, cells. Ions regulate electrostatic pressure between the cells' internal and external environments, which, in turn, regulates their volume and water content. Cells that lose their water content without bei...

U-M team recovers ancient whale in Egyptian desert

... function and metabolic activity with no long-term negative effects. If Roth and colleagues are able to replicate these findings in larger animal models, they foresee the first clinical use of this technology in humans could involve treating people suffering from severe fevers of unknown origin. Currently, w...

Buying Time Through Hibernation on Demand

... function and metabolic activity with no long-term negative effects. If Roth and colleagues are able to replicate these findings in larger animal models, they foresee the first clinical use of this technology in humans could involve treating people suffering from severe fevers of unknown origin. Currently, w...

Microbial fuel cell: High yield hydrogen source and wastewater cleaner

...f a programmable power supply to the anode and the negative pole to the cathode. The researchers call their hydrogen-producing MFC a BioElectrochemically-Assisted Microbial Reactor or BEAMR. The BEAMR not only produces hydrogen but simultaneously cleans the wastewater used as its feedstock. It uses about one...

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