Word: celling
(lookup in dictionary)
(lookup stats)
Dates: during 1990-1999
Sort By: most recent first
(reverse)
According to Faustman, the body normally rejects any transplanted foreign tissue. This rejection occurs by way of a special type of white blood cell, called a T-lymphocyte, or a T-cell...
...lymphocytes generally swim by and attach onto the surface of foreign cells," Faustman says. They have a "memory" which allows them to promptly attack a previously identified coding region, or epitope, on the cell...
...capitalize on preliminary scientific research suggesting that certain vitamins and other chemicals may improve skin appearance. Some seem to counteract the bad effects of substances called free radicals, which are produced regularly by the body's metabolism. These highly volatile substances -- oxygen ions are one example -- react with cell membranes, and over time the radicals may play a role in various ailments and the aging process itself. There is evidence that at least one radical-fighting skin cream, a vitamin-A derivative called Retin-A, stimulates skin-cell production, but it is sold only by prescription. Another prescription product...
This glorified Patriot missile program would afford limited protection in case a renegade government or terrorist cell launched a nuclear missile. America could share the technology and its costs with U.S. allies...
Even more provocative is a new area of research that combines the techniques of in vitro fertilization with the latest advances in genetic screening. Abnormalities like sickle-cell anemia or cystic fibrosis are present in the genetic code from the moment of conception. Since embryos in their earliest stages are fairly forgiving -- they can lose a cell or two without impairing their subsequent development -- it is theoretically possible to remove a cell from, say, a 16-cell embryo, test it for a suspected defect, and get the answer before that embryo is inserted into the uterus for implantation...