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Tag: "debate" at biology news

Scientists crack 40-year-old DNA puzzle and point to 'hot soup' at the origin of life

... organisms. This provides further evidence for the debate on whether life emerged from a hot or cold primordial soup. "There are still relics of a very old simple code hidden away in our DNA and in the structures of our cells," said Dr van den Elsen, who points to several aminoacyl-tRNA synthetases - molec...

Center releases new public survey on stem cells

...tection and should not be destroyed. Much current debate focuses on whether other sources of stem cells - b... embryos has been the centerpiece of the political debate about ESC research, often articulated as an all-or-nothing proposition that is fully predictive of a...

Newly discovered birdlike dinosaur is oldest raptor ever found in South America

... incomplete preservation led to some ambiguity and debate regarding their identities. The new discovery provides definitive evidence that dromaeosaurs also lived in South America, which was part of Gondwana. As a result, dromaeosaurs must have originated when all of the continents were still assembled in ...

Did feathered dinosaurs exist?

... birds are related to theropod dinosaurs; however, debate has raged on over whether today's winged creatures...sed of digits 2-3-4." It is too early to abandon debate on the origin of birds, the authors say. However, mounting evidence suggests that "a possible soluti...

Johns Hopkins flu expert calls for mandatory vaccination of health care workers

...e. Perl's view, which is likely to inform further debate on the subject of voluntary versus mandatory worker vaccination programs, is based on research showing that despite free and ready access to the vaccine, only 40 percent of all health care workers actually get a flu shot. "We have gone as far as pos...

MicroRNA may have fail-safe role in limb development

.... "In developmental biology, there has always been debate about why forelimbs are different from hindlimbs. We now think this microRNA is regulating something important in the hindlimbs but not in the forelimbs." Scientists do not know exactly what is happening, but they think miR 196 acts as a protective ...

Predators keep the world green, ecologists find

...team's results have important implications for the debate raging in many countries over reintroduction of top predators such as wolves. "The take-home message is clear: the presence of a viable carnivore guild is fundamental to maintaining biodiversity," the authors wrote. Information collected for the Jou...

Bones from blood: Scientists aim to break new ground on fractures

...lso investigate how the project contributes to the debate about the ethics of stem cell research. In particular, they will consider how potential benefits of these stem cell therapies can be weighed against ethical concerns." ...

Mute swan population helps explain longstanding evolutionary question

... in accordance with natural selection. "Extensive debate in the literature…was first focused on the questio...?" said researcher Ann Charmantier. "Gradually the debate switched to an evolutionary point of view with a second, related question: Why is clutch size not ev...

World faces challenge as life expectancies lengthen, scientist says

...s like Sweden and Italy have been having this huge debate for many years over population decline," Tuljapurkar explained. "A lot of the debate is about immigration: People have been telling them they need to increase immigration in order to ke...

How does the brain know what the right hand is doing?

...experiment has shed more light on the multi-decade debate about how the brain knows where limbs are without looking at them. You don't have to watch your legs and feet when you walk. Your brain knows where they are. For decades scientists have debated two options for how the brain achieves this: (1) the o...

Relic of life in that Martian meteorite? A fresh look

Since the mid-1990s a great debate has raged over whether organic compounds and tiny ...ecules on Mars. "Although we haven't settled the debate on whether evidence of life is contained in Allan Hills, we have shown that these carbon complexes l...

Warming trend may contribute to malaria's rise

... the science. I hope we can move from this sort of debate into a more constructive one about interactions and relative roles of all the factors that may be contributing to the resurgence of malaria." ...

Study finds evolution doesn't always favor bigger animals

...mpacted by global warming. "There's still a huge debate over what drives Cope's Rule, but our study shows that climate change can undoubtedly play an important role" said Roy. For much of the past 40 million years, global climate has been exhibiting a steady cooling trend. But within the last century, a...

Potential heart benefit found in stem cells

...ls derived from new sources may bypass some of the debate that is preventing research progress right now," said Sharon A. Hunt, M.D., Stanford University. "The research presented here is extremely promising, and should be followed by more in-depth and patient-focused studies to determine the true feasibili...

All placebos not created alike

The debate about the existence of a placebo effect has heated up over the past year as more and more lab experiments are detecting immediate physiological responses to placebos. A new study takes placebo investigations out of the lab and into a clinical trial, ...

Is the brain wired for faces?

...on of the journal Neuron, adds new evidence to the debate over how the brain understands and interprets faces, an area of neuroscience that has been somewhat controversial. Because the process of facial perception is complicated and involves different and widespread areas of the brain, there is much that re...

Wisconsin scientists grow two new stem cell lines in animal cell-free culture

...tures free of animal products could accentuate the debate over federal funding for research on additional stem cell lines. The Senate is expected to take up the issue early in 2006 when it debates legislation that would expand funding to lines derived after August 2001, when President Bush imposed a comprom...

Attacking cancer's sweet tooth is effective strategy against tumors

...lly, is the way the study resolves a long-standing debate about how and why cells switch to glycolysis in the first place. Warburg speculated that cancer cells change over to glycolysis, which occurs in the cytoplasm, because the mitochondria, where oxygen-dependent ATP synthesis occurs, are defective. But ...

UGA study explains peaks and troughs of dengue epidemics

..." In addition to helping resolve a long-standing debate in public health, the study, published this week in the early online edition of the journal Proceedings of the National Academy of Sciences, gives researchers a framework that can be used to create models that predict dengue outbreaks in both space a...

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