Selenium confers its antioxidant protection mainly through two enzymes that contain it—glutathione peroxidase and thioredoxin reductase. So Levander and his co-workers wondered whether other metals that compete for the selenium site in thes...
http://www.ars.usda.gov/is/AR/archive/sep01/nutr0901.ht...
a cholera bacterium that takes instruction from a virus. In 1993, as cholera swept through India, scientists were faced with a set of perplexing questions: What caused the deadly Bengal strain of cholera to reappear? Where did the deadly...
http://focus.hms.harvard.edu/1996/Jul19_1996/Microbiolo...
Immature social wasps Polistes dominulus was artificially infected with the strepsipteran parasite, Xenos vesparum Rossi, in order to examine levels of virulence. Results reveal that there was no difference in virulence between infected and...
http://www.faqs.org/abstracts/Environmental-issues/Cost...
Methicillin-resistant Staphylococcus aureus (MRSA) remains a major problem in hospitals, and it is now spreading in the community. A single toxin, Panton-Valentine leukocidin (PVL), has been linked by epidemiological studies to community-as...
http://www.medscape.com/medline/abstract/17109350
OBJECTIVE: Infective endocarditis is frequently caused by oral streptococci, especially Streptococcus sanguis. In this group, many strains have recently been reclassified on the basis of new taxonomic schemes. The purpose of this study was ...
http://www.unboundmedicine.com/medline/ebm/record/11856...
The evidence appears quite contradictory around the world, and regardless, it does not seem to fully explain the explosion of PCVAD problems in the last decade.
http://nationalhogfarmer.com/health-diseases/0615-top-p...
Bacteria are never virulent. What you are asking is, why do bacteria slow their relative rate of effectiveness in an ecology. But to answer your question, bacteria are in constant flux. They need nutrients, low niche competitiveness, and id...
http://in.answers.yahoo.com/question/index?qid=20090512...