Tag: "abrupt" at biology news
Pesticides may promote Parkinson's disease and exercise may offer protection
... Parkinson's were made in a way that causes a very abrupt
death of the dopamine nerve cells--a process that doesn't resemble the slow, progressive nature of Parkinson's disease in humans." So Zigmond and his colleagues re-did the study, this time injecting the neurotoxin--6-hydroxydopamine (6-OHDA), which ...
Global warming: Informal networking is the key to a swift response
... examined how they might deal with possible future abrupt
climate change. The groups included scientific officers at DEFRA, representatives of the Environment Agency and the Welsh Assembly and members of a dairy farmers' cooperative. The data collected from interviews, focus groups and workshops suggest...
Science to restore the nation's ecosystems
...:50am, Location: Great Hall Center. The causes of abrupt
climate changes are not understood. Paleoclimatic ...rge changes in ecosystems. Given the likelihood of abrupt
climate changes in the future, we consider their potential impacts on ecosystems and the implication...
Assumptions of effects of rising carbon dioxide probed
...ure extremes. The fungi were exposed to either an abrupt
or gradual increase in this atmospheric gas. The g...ty of the fungi than did the group exposed to the abrupt
change, but the difference was not significant. The findings suggest that previous work has overest...
Global team member comments on landmark ecosystem report
...eases, the degradation of water supplies and other abrupt
changes that will seriously affect human health, the report states. "In the past, we were able to feed enough people and maintain a steadily growing consumption of goods but at great expense to the environment," Sala said. "This report clearly shows...
News tips: NASA presentations at Annual 2005 Joint Assembly Meeting
...n) This research draws attention to the effect of abrupt
climate change on a major event in human history, the invention of agriculture. By using time-scale analysis of model and other data, researchers argue that climatic changes were too great and too frequent to permit the development of a successful ag...
When in danger humans are similar to a deer in the headlights
...ir body sway reduced. The authors found that this abrupt
reaction, so critical for the survival of some animals, has stayed with humans. Forty-eight male volunteers stood barefoot on a stabilometric platform, to measure balance and body sway, and viewed twenty-four pictures from three different categorie...
Did humans cause ecosystem collapse in ancient Australia?
...ut no changes in the diet and environment until an abrupt
transition was noted that corresponded to the arrival of humans. "Humans are the major suspect," commented Fogel. "However, we don't think that over-hunting or new diseases are to blame for the extinctions, because our research sees the ecological tr...
Insight into the processes of 'positive' and 'negative' learners
...ices. Researchers believe that the ERN reflects an abrupt
dip in signaling between neurons that depend on the neurotransmitter dopamine. A key question, though, has been exactly what kind of processing ERNs reflect in the ACC. While one theory holds that ERNs reflect a mechanism by which the brain detects e...
Climate model links higher temperatures to prehistoric extinction
...istory. The work gives support to a theory that an abrupt
and dramatic rise in atmospheric levels of carbon dioxide triggered the massive die-off 251 million years ago. The research appears in the September issue of Geology. "The results demonstrate how rapidly rising temperatures in the atmosphere can affe...
GSA should stand for 'going strong again' for the UC Department of Geology as always
...hesis and perhaps rather fresh water has a role in abrupt
climate changes at all."...
How to braid nanoropes
...s may segregate into small sub-bundles, or undergo abrupt
unbinding transitions. (Physical Review Letters 95, 038102, July, 2005). Biological cells are mechanically stable because they contain actin filaments and microtubules that form networks and bundles. These filament architectures are determined and c...
New evidence extends greenhouse gas record from ice cores by 50 percent, adding 210,000 years
... past ice ages also provides indirect evidence for abrupt
climate change in the past, the authors found. This suggests that abrupt
climatic events on time scales relevant to societies may be common features of the last climatic cyc...
The first baby boom
...graphic change we detected is characterized by an abrupt
20 to 30 percent increase, over 500 to 700 years, in the proportion of immature skeletons." While prior research has been done on the Neolithic Demographic Transition, as the increase in birth rate is known, Bocquet-Appel and Stephan Naji are the fir...
Bird flu poses threat to international security, Illinois scholar says
...ity is a scenario in which the virus mutates in an abrupt
manner, resulting in human-to-human transmission. If that occurred, he said, the number of human deaths tallied would likely be "on a wider scale than any attack by humans on humans other than nuclear war." "People think of international security as...
Phytoplankton bounce back from abrupt climate change
The majority of tiny marine plants weathered the abrupt
climate changes that occurred in Earth's past and ...ulations of these plankton during three periods of abrupt
climate change. These abrupt
changes were caused either by Oceanic Anoxic Events during the middle ...
Ancient greenhouse emissionspossible lessons for modern climate
...suggests there could be some dramatic, potentially abrupt
changes in store. "There's an awful lot of knowledge we can gain from past climates," says Mark Chandler, an atmospheric scientist at Columbia University. He has been studying a warming episode 3 million years ago during a period called the Middle Pl...
Vital organs in the Earth system: What is the prognosis?
...olds that, once tipped, could lead to large-scale, abrupt
changes. Noone will describe the kind of systems-l...h was once a region of rich vegetation, before its abrupt
collapse about 6000 years ago. Stefan Rahmstorf, Potsdam Institute for Climate Impact Research, Germ...
Cod in a sweat: Some like it hot!
...od in the northeast Atlantic repeatedly experience abrupt
temperature changes of up to 8C, suggesting that temperature may not be so crucial in constraining the movements and distribution of adult cod", explains Dr Metcalfe, "However this doesn't mean that climate change won't impact the numbers or distribu...
Study shows that genetic quality of sperm deteriorates as men age
...Downs syndrome) as women age, and with a seemingly abrupt
end of fertility around perimenopause. Our researc...fferent. Men seem to have a gradual rather than an abrupt
change in fertility and in the potential ability to produce viable healthy offspring." Unlike in wo...