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Tag: "controversial" at biology news

Growth in the sea comes down to a struggle for iron

...could help determine the fate of something else, a controversial proposal to address the threat of global warming. ... global warming. However, this idea remains highly controversial in scientific circles given the very limited understanding of these unique systems, says Wells. Wel...

Scientists rid stem cell culture of key animal cells

Tackling a pressing and controversial technical barrier in stem cell biology, scientists at the WiCell Research Institute and the University of Wisconsin-Madison have crafted a recipe that allows researchers to grow human embryonic stem cells in the absence of mouse-derived "feeder" cell...

Family trees of ancient bacteria reveal evolutionary moves

...ogists and geologists studying one of Earth's most controversial eras ?approximately 2.1 billion years ago, when cyanobacteria first arose on the Earth. This was a time when the Earth's atmosphere had an incredible, mysterious and inexplicable rise in oxygen, from extremely low levels to 10 percent of what it is t...

NASA links nanobacteria to kidney stones and other diseases

...pt that nanobacteria are living organisms is still controversial because the research on their putative nucleic acid has not been completed yet," states lead researcher Neva Ciftcioglu, Ph.D. However, the group's research provides additional clues to understanding NB and its link to pathologic calcification-relate...

Strongest proof yet found for prion hypothesis

..., scrapie, kuru and chronic wasting disease. This controversial "prion hypothesis" was proposed by Stanley Prusiner in 1982, and led to Prusiner receiving the Nobel Prize in Medicine in 1997. Until now, however, scientists have been unable to confirm its validity by causing a TSE in normal lab animals by infectin...

Report that delayed motherhood decreases life expectancy of mouse offspring

... 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 Pediatrics, University of Valencia, Spain, presents data in the June issue of the journal that delayed motherhood in mice results in decreased life expec...

Researchers develop assay that could be applied to drug screening

...by actin in clathrin mediated endocytosis has been controversial for a long time," Zenisek said. "We've now shown in live cells that proteins involved in actin polymerization are recruited to sites of membrane scission, and that disturbing actin polymerization with the toxin latrunculin B, a toxin found in Red Sea...

15 generations of untrained jocks, couch potatoes show big physiological adaptations

..."Additionally, our results provide support for the controversial hypothesis that suggests that physiological systems, such as the oxygen delivery pathway, are, over time, optimized in animals," Kirkton noted. Next steps and implications for human attitudes and therapies Having demonstrated the genetic role in en...

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

... problem. Enter a recently discovered and already controversial natural molecule called nicotinic acid adenine din...y. However its mode operation remains unknown ?and controversial in several aspects. Results of a new study "establishes NAADP as a new second messenger, and the st...

Hopkins AIDS experts issue warning about global efforts to provide drug therapies

...antly flooded with requests from the public. More controversial was the penicillin case, in which two government-appointed committees, one military and the other civilian, decided who received medications. While the civilian committee allocated drugs to the most seriously ill, its decisions were viewed as cold-he...

Specialized immune-system B cells play double-barreled role

... function of B-1 cells in the body has been highly controversial over the past two decades," said Tedder. "They appear to be a primary defense mechanism for innate immunity in infections. In particular, however, the B-1b cells have been largely ignored because they're present in relatively small numbers and are di...

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

...ontrasting input from the ears. "It has been very controversial whether humans can do egocentric localization, that is, keep their head motionless and say where the spatial source of an odor is," said study coauthor Noam Sobel, associate professor of psychology at UC Berkeley and a member of the campus's Helen Wi...

US Army plans to bulk-buy anthrax

...ary wants to buy large quantities of anthrax, in a controversial move that is likely to raise questions over its commitment to treaties designed to limit the spread of biological weapons. A series of contracts have been uncovered that relate to the US army' Dugway Proving Ground in Utah. They ask companies to te...

Research suggests fitness of Florida panthers improved by limited breeding with Texas animals

...mated 30 to a recently counted 87 as a result of a controversial breeding effort to improve the genetic health of the endangered and inbred animals, according to a new assessment. Hybrid kittens born to panthers brought into the area from Texas have "about a three times higher chance of becoming adults as do pure...

Time and money make a difference in endangered species recovery

...ecome a major focus of political battles over this controversial environmental law. ...

Women feel more pain than men, research shows

...nics and hospitals. "Until fairly recently it was controversial to suggest that there were any differences between males and females in the perception and experience of pain, but that is no longer the case," said Dr Ed Keogh a psychologist from the Pain Management Unit at the University of Bath*. "Research is te...

Discarded placentas deliver researchers promising cells similar to embryonic stem cells

...reat diseases and regenerate tissues as their more controversial counterparts, embryonic stem cells, suggests a University of Pittsburgh study to be published in the journal Stem Cells and available now as an early online publication in Stem Cells Express. A part of the placenta called the amnion, or the outer me...

Out of sight, out of mind? Not necessarily

...scious processing takes place within the brain - a controversial claim that was advanced by the likes of Sigmund Freud and William James - our results suggest that multiple pathways relay visual input into the central nervous system for different types of processing," Ro said. "And our study also begins to shed l...

Tissue regeneration operates differently than expected

...he repair and maintenance of organ functions. The controversial idea is that adult stem cells have the potential for transdifferentiation; in other words, that they are able to transmutate from one type of organ cell to another. If that is the case, bone marrow cells would be able to change into lots of different...

Picky female frogs drive evolution of new species in less than 8,000 years

...oritz said. This so-called reinforcement has been controversial since the time of Charles Darwin, with some biologists claiming that it requires too many steps for evolution to get it right. "Some have argued that it's just too complicated and that it is not really necessary, and there have been few convincing d...

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