Word: molecular
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...Chemistry 171, Molecular Enzymology, and Chemistry 172, biorganic chemistry--both listed under Knowles' name in last year's course catalog and bracketed until 1992-93--will not be offered this year...
...that molecule could make it impossible for the antibiotic to stick to its target. It's something like the protect-the-perimete r strategy used by defenders of ramparts on medieval fortresses. In other cases, says Neu, the bacteria develop enzymes capable of destroying the antibiotics and even molecular pumps that expel the drugs from the cell. The most recent example of bacterial resourcefulness came to light only two weeks ago. By deleting a single gene, an English-French research team announced, certain strains of the TB germ have protected themselves from isoniazid, currently the major weapon against this resurgent...
...Chemistry 171, Molecular Enzymology, andChemistry 172, Bioorganic Chemistry--both listedunder knowles' name in last year's course catalogand bracketed until 1992-93--will not be offeredthis year, after...
...understand the method to its madness. Like all viruses, HIV is simply a strand of genetic material (in this case the nucleic acid RNA) surrounded by a protein coat. A virus lacks the tools to reproduce unless it invades a living cell and takes over the host's molecular machinery. The intruder can then produce many copies of itself, eventually killing the cell. One of HIV's favorite targets is the CD4 T-cell, an important player in the human immune system...
Using biochemical tools that were not available at the beginning of the epidemics in Africa and the Americas, molecular biologist Chin-Yih Ou and his colleagues at the U.S. Centers for Disease Control found two distinct epidemics caused by somewhat different strains of HIV in the northern Thai city of Chiang Mai. Both epidemics started no more than four years ago, but one occurred mostly in intravenous drug abusers and the other started in female prostitutes. There was little overlap between the two groups...