Tag: "acidic" at biology news
What we can learn from the biggest extinction in the history of Earth
...gases would have caused the oceans first to become acidic
and then to become supersaturated with calcium car...bundances of carbon isotopes, strongly suggests an acidic
marine environment at the time of the extinction. The rock layers immediately covering this eroded s...
...nd contain many basic groups. In water or slightly acidic
solution, the acidic
groups carry a positive charge while the basic groups are negatively charged; this causes them to at...
Sour taste make you pucker? It may be in your genes
...w the taste system is able to detect and translate acidic
molecules on the tongue into a neural signal that the brain perceives as sour. Demonstrating a genetic component to individual differences in sour taste is the first step in pinpointing the genes that determine sensitivity. The products of those ge...
Investigating Life in Extreme Environments report gives hints on facts of life
...de range of extreme environments (from deep sea to acidic
rivers, polar regions or planetary bodies). A series of recommendations were made from a large-scale interdisciplinary workshop (128 participants) organised in November 2005 with an additional workshop organised in March 2006. They have identified in...
How E. coli evolves to adapt to changing acidity
...was exposed to pH levels that cycled daily between acidic
and basic conditions. After at least 1,000 gene...s, the researchers exposed the groups to either an acidic
or basic environment. The groups exposed to acid or base for the entire period had developed into sp...
Salt increases ulcer-bug virulence
... is a spiral-shaped bacterium that can live in the acidic
environment of the stomach and duodenum which is the section of intestine below the stomach. It is the most common cause of ulcers of the stomach and duodenum, accounting for up to 90% of duodenal ulcers and up to 80% of gastric ulcers. Infection wit...
pHLIP, a novel technology to locate and treat tumors
...e fact that most tumors, even very small ones, are acidic
as a result of the way they grow. Since the mec... neutral pH, the water-soluble form is favored. At acidic
pH, the transmembrane alpha-helix predominates. An earlier paper from the same groups shows that ...
Fascinating spider silk
...ut within the spinning duct it drops to a slightly acidic
level. No phase separation was observed for the synthetic spider protein when the pH was maintained at an alkaline level. At high pH, the normally uncharged tyrosine groups in the protein are deprotonated, which gives them a negative charge. This cha...
ACS News Service Weekly PressPac -- March. 14, 2007
...as in older landfills. In the natural environment, acidic
conditions may keep prions near the soil surface, increasing the risk that animals will ingest prions and become infected, the report says. The team is conducting further research to determine whether these expectations are borne out. ARTICLE #4 FO...
Genes and groups of genes commonly shared between species, studies show
...f bacteria living together in the pink slime of an acidic
California mine were found to share large groups of genes. These genes code for proteins that work together, so by acquiring the entire block from another organism, bacteria can gain a new function that helps them adapt more quickly to the same type ...
Regardless of global warming, rising CO2 levels threaten marine life
... the next few decades, we may make the oceans more acidic
than they have been for tens of millions of years, Caldeira said. And thats bad news....
ACS News Service weekly PressPac -- Feb. 7, 2007
...nds in extra virgin olive oil remain stable in the acidic
environment of the stomach for hours. In laboratory cultures, those substances had a strong antibacterial effect against eight strains of H. pylori, including antibiotic-resistant strains. "These results open the possibility of considering extra vir...
Investigating the invisible life in our environment
...n four very different environments: ocean surface, acidic
underground mine water, whale bones from the deep sea and farm soil. "Most of the DNA we found fits into the evolutionary ancient parts of the tree of life, which means that the organisms are probably not close relatives of the species sequenced a...
Quantum biology -- Powerful computer models reveal key biological mechanism
...d that the reaction at the C-terminal speeds up in acidic
environments. But to control the reaction and use it as a nanoswitch, a better understanding of the mechanism behind this reaction is needed, according to Philip Shemella, a doctoral student in physics at Rensselaer and corresponding author of the cu...
Leading cause of US food-borne illness makes its own pathway through cells
...l moves to compartments called lysosomes, where an acidic
mix of enzymes breaks it down. By monitoring markers for this entry pathway, Watson and Galn could watch as the microbe infected a host cell, briefly associated with the early marker protein EEA-1, and then with the late marker Lamp-1. "Although th...
Shotgun sequencing finds nanoorganisms
...bacteria and newfound Archaea living in the highly acidic
mine drainage are archetypes of the kind of life t...e drainage, which live in a pink slick on pools of acidic
green water, obtain energy by oxidizing iron - that is, generating rust -- and in the process create...
2006 is banner year for discoveries of new species in Borneo's rainforests
...third of an inch in length and found in the highly acidic
blackwater peat swamps of the island; six Siamese fighting fish, including one species with a beautiful iridescent blue-green marking; a catfish with protruding teeth and an adhesive belly which allows it to literally stick to rocks; and a tree frog ...
Combination of technologies works best against E. coli
...goes on. Fengs use of ultrasound, irradiation, and acidic
electrolyzed water to eliminate E. coli on alfalfa...ivation of E. coli 0157:H7 with peroxyacetic acid, acidic
electrolyzed water, and chlorine on cantaloupes and fresh-cut apples was published in the November 2...
The biggest bug in gut discomfort
... routed to compartments called lysosomes, where an acidic
brew of hydrolase enzymes chews it up. By monitoring endosomal marker proteins, the researchers could watch as C. jejuni infected a host cell, and was briefly cloaked in the early endosomal marker EEA-1, and then the late endosomal marker Lamp-1. Was...
A molecular condom against AIDS
...m entering cells or replicating, or by maintaining acidic
vaginal conditions. No first-generation microbicid...men, which has a pH of 7.5, more alkaline than the acidic
vaginal pH of 4 to 5. Kiser conducted the research with University of Utah bioengineering graduate...
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