Tag: "bonds" at biology news
The inside dope
...UV light or weak electron beams, changing chemical bonds
between the carbon atoms that make up the molecular layer. These bonds
ultimately influenced electronic transport through the molecules. This achievement was recently de...
...ddition to this electrostatic attraction, hydrogen bonds
are also formed, which causes the two surfaces to ... more strongly acidic (a pH value of about 1), the bonds
break up, the basic groups lose their charge, and the electrostatic attraction lets up. The two surf...
Unraveling the physics of DNA's double helix
...tudies have focused more attention on the chemical bonds
between opposing bases, measuring their strength b...e attraction between bases within DNA strands. The bonds
within the molecules' sugar and phosphate backbones remained intact and therefore had only a minor i...
Stressed-out African naked mole-rats may provide clues about human infertility
...o vary widely in the way in which they form social bonds
with their partners, offspring and kin. By making careful comparisons with model species like mole-rats, we may be able to tease apart the relative contribution of genes, environment, up-bringing and culture to complex social behaviour in our own spe...
Scientists ponder plant life on extrasolar Earthlike planets
... would have the same protein backbone with peptide bonds
and so forth. But theres no reason to think it would be comprised of the same 20 amino acids that we have on Earth. Its intriguing to speculate, and I think well know more when we get more clues....
Giant magnetocaloric materials could have large impact on the environment
...ant entropy change when germanium-silicon chemical bonds
connecting the magnetism-carrying gadolinium ions are quickly formed or broken, respectively, by the application or removal of a magnetic field. As an added bonus, the magnetic ordering temperature can be tuned by changing the ratio or germanium to s...
Researchers examine carbon capture and storage to combat global warming
...arbon dioxide in deep coal beds. In coal, chemical bonds
form between the carbon dioxide and the coal, making the method potentially more secure than others, the researchers said. Even better, the process can free natural gas that sits on the coal's surface. Natural gas is a relatively clean fossil fuel,...
Simulations unravel outer membrane transport mechanism
...orce to TonB and showed that the multiple hydrogen bonds
between TonB and the luminal domain were strong enough to remain intact while TonB pulled the end of the luminal domain away from the barrel. The simulation also showed the luminal domain gradually unfolding, changing its conformation in ways that wo...
MIT-led team uncovers malaria mechanism
...eb.mit.edu/newsoffice/2007/blood.html ) When the bonds
in the protein network are broken, holes open up i...feres with the proteins' ability to break and form bonds
with each other, decreasing deformability, according to Suresh. In an unrelated parallel study, rese...
Freeze! Scientists film proteins at work by freezing them at different states
... the appropriate ones by showing them the chemical bonds
in each stage of the reaction. Once they had identified the right states, they studied the sample with synchrotron x-rays. We expect this new methodology to be of use for many researchers in the field, Bourgeois explains. Filming certain proteins w...
New imaging approach promises insights into multiple sclerosis
...can reveal whether the orientation of the chemical bonds
in these lipid molecules is "scrambled," when the myelin sheath is unhealthy and degraded from disease, Cheng said. "We can see the myelin sheath with CARS, and that's great, but it's not enough," Cheng said. "We also want to study other molecules ...
Where is the proton? Yale scientists discover footprints of shared protons
...hered molecules, participating in partial chemical bonds
to both. "In biological systems, any time you have molecules with a nitrogen or oxygen, and add in an extra proton, the proton forms a bond with one of the extra electron pairs that are available," according Johnson. "It crashes the party and change...
New way to catch cancer's spread, rapid 3-D retinal imaging, more at CLEO/QELS 2007
...ractical uses, such as controlling the breaking of bonds
in complex molecules for medical and pharmaceutical applications. (Paper JThA5, "Isolated Attosecond Pulses in the Few-Cycle Regime") Expanded story at: http://www.cleoconference.org/media_center/lightpulse.aspx RAPID HIGH-RESOLUTION 3-D IMAGE...
York mathematician probes geometric route to combat viruses
...hat pinpoint the locations of the proteins and the bonds
between them. With collaborators Professor Cristian Micheletti, from the International School for Advanced Studies (SISSA) in Trieste, Italy, and Professor Anne Taormina, from the University of Durham, she has used these results to model the assembly...
Meat and two neutrons -- the key to a longer life
...attack. The isotopes replace atoms in susceptible bonds
making these bonds
stronger. 'Because these bonds
are so much more stable, it should be possible to slow down the proce...
Progress toward artificial photosynthesis?
...he biggest challenges in synthetic chemistry." The bonds
in this molecule are very stable, so a lot of ener...talysts are known to be capable of breaking the CO bonds
in CO2. In contrast to most previous approaches, Antoniettis team worked with metal-free catalysts,...
Press conferences at the year's largest physics meeting
...rests, secretes a protein that attaches to certain bonds
in ice crystals, but not to others. Meanwhile, Frank Moss of the University of Missouri will show that the zooplankton hunts for food in water by engaging in a statistically nonrandom series of turning angles which optimize the food obtained in food...
Bacterium could treat PCBs without the need for dredging
...landfill. In order to detoxify PCBs the strong bonds
between the chlorine atoms and the biphenyl compounds that make up the PCB atomic structure need to be broken, a process known as dechlorination. More than two decades ago, scientists discovered that PCBs were slowly being dechlorinated by naturally ...
Computer-designed molecule to clean up fluorocarbons?
... simple organic molecular system able to break C-F bonds
without extreme temperature and pressure conditions, and a demonstration of a novel technique for designing man-made molecules that can mimic the extraordinary selectivity and chemical activity of natural enzymes. Notes lead researcher Carlos Gonzale...
Physicists reveal water's secrets in journal Science
...nd the ability of water molecules to form hydrogen bonds
with other water molecules. The hydrogen side of the water molecule has a slight positive charge, while a slight negative charge exists on the opposite side of the molecule. "For a long time, most researchers agreed that, in its liquid state, eac...
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