Tag: "random" at biology news
Green tea boosts production of detox enzymes, rendering cancerous chemicals harmless
...though researchers believe that decline was due to random
variation. This is the first clinical study to show proof that chemicals in green tea can increase detoxification enzymes in humans, Chow said. There may be other mechanism in play by which green tea may protect against cancer development, but this...
Swarming starlings help probe plasma, crowds and stock market
...r flocks of birds suddenly move from a disordered random
state to an ordered one. To crack this problem they developed a technique that combines an earlier study of the flocking behavior of large groups of birds and insects with information technology used to correlate information from a range of parallel...
Tropical insects 'go the distance' to inform rainforest conservation
...ame. And if there are differences, they seem to be random
and not caused by any environmental change. Study findings were similar for the butterfly and fruit fly species examined in the study. Such knowledge is critical to understanding the roles of ecological processes in maintaining tropical diversity...
Universe's stringy birth revealed by young Czech scientist in EURYI winning project
... is how the universe emerged in the beginning as a random
fluctuation of a vacuum state, and the other is a common explanation for all sub-atomic particles. Czech physicist Dr. Martin Schnabl has been selected to receive a EURYI Award by the European science Foundation (ESF) and the European Heads of Resea...
Where broken DNA is repaired
...initial model, following the NASA model, confirmed random
distribution of double-strand breaks at the micron...model predicted that these breaks would occur in a random
pattern in three dimensions throughout the nucleus (not along lines), in fact, under the microscope,...
News tips from the Journal of Neuroscience
...assumed that excitatory release events occurred at random
times and that each event caused a spike unless the fiber was refractory. Their results suggest that spontaneous release from the ribbon can be described as a homogeneous stochastic process with interevent distributions composed of an exponential and...
A brain chemical that battles despair
...ss. Their approach involved first exposing mice to random
shocks from which the animals could not escape. Such repeated exposure to inescapable stress tends to increase the lag time for mice to escape subsequent shocks, when they are given the chance to escape. Measuring this lag time, or the complete failu...
Species detectives track unseen evolution
...er factoring in a degree of cryptic diversity as a random
error in all biodiversity assessments. A cryptic species complex is a group of species that is reproductively isolated from each other - but lacking conspicuous differences in outward appearance. Researchers using techniques such as polymerase chai...
Microscopic jets, diamonds unlikely on Uranus, and amazing mosquito legs
... motion of the uncoated balls. Their paths were a random
walk with step sizes that depended on the concentration of hydrogen peroxide. The larger the hydrogen peroxide concentration, the larger the step. Physicists have yet to devise a way to keep the balls heading in a particular direction, but chemica...
Unraveling the physics of DNA's double helix
... of their own, while thymine chains take on a more random
shape. The pure adenine strands exhibited an even more complex form of elasticity than had been anticipated, the researchers reported. As they stretched the adenine chains with increasing force, the researchers noted two placesat 23 and 113 pico-Ne...
A first-principles model of early evolution
...teins. The simulation of the model proceeds via random
mutations, gene duplication, organism births via replication, and organism deaths. The authors find that survival of the population is possible only after a Big Bang when a very small number of advantageous protein structures is suddenly discovere...
Neutral evolution has helped shape our genome
...g time, the basic belief of evolution was that all random
genetic changes that manage to stick around have s...that frequently, we are what we are largely due to random
changes that are completely neutral. I am not at all discounting the role of natural selection, th...
Physicist cracks women's random but always lucky choice of X chromosome
...st" choice to be made between things rather than a random
one. Now researchers led by University of Warwic...mber of women who unusually dont have a completely random
distribution of X chromosomes but the explanation may have much wider implications as at least 10% o...
Scientists propose the kind of chemistry that led to life
...chemical steps to Darwins principles of evolution: random
selection of traits in different organisms, select...astic innovation suggesting that it involves both random
(stochastic) interactions and the emergence of novel arrangements. A major question about lifes or...
A twist of fate -- Reprogrammed fibroblasts resemble embryonic stem cells
...was silenced in differentiated cells and exhibited random
X inactivation upon differentiation. Our results demonstrate that the ectopic expression of four transcription factors is sufficient to globally reset the epigenetic landscape of fibroblasts into that of pluripotent cells that are remarkably simila...
In search of the biological significance of modular structures in protein networks
...ar properties and conclude that they may be only a random
byproduct of evolution, and not functional at all. The modules of cellular networks were thought to be formed in a way that reflects the relative independence and coherence of the various functional units in a cell each module serves a function. T...
A new wrinkle in evolution -- man-made proteins
...n that had been previously selected from a pool of random
sequences. Jack Szostak and Anthony Keefe first...one or two new proteins and generated a library of random
amino acid sequences so vast 400 trillion that it dwarfs the number of items in the entire Library...
Left-right wiring determined by neural communication in the embryonic worm
...nation of which nerves develop on which side seems random
from worm to worm. But now, Rockefeller University and Howard Hughes Medical Institute scientists working to demystify the worm's asymmetry have discovered that the arbitrary left-right configurations of two types of olfactory neurons are establish...
Genome of yellow fever/dengue fever mosquito sequenced
... Tu said. "By introducing TEs in a more or less random
way to see what happens to the laboratory mosquitoes, the TEs become a tool to study the genetic mechanism of mosquito-virus interaction, to help us understand mosquito biology and reveal new ways to interfere with disease transmission," Tu said. A...
Do fruit flies have free will?
...ternal stimuli, they attribute this variability to random
errors in a complex brain." Using a combination of...time that such variability cannot be due to simple random
events but is generated spontaneously and non-randomly by the brain. These results caught computer s...
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