Word: celling
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Dates: during 1990-1999
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...press conference announcing the publication of results in the February 21 issue of Cell magazine, MIT scientist J. David Brook said that his team had located the gene that leads to the disease's most common form, myotonic dystrophy...
Wandering through the Embryo: Cell Migration in Early Development--by Rachel Fink, Virginia Apgar Assistant Professor, Mount Holyoke College. Reception to follow in room 154 of Biological Laboratories at 5 p.m. Biological Laboratories, Main Lecture Hall...
...threat to the world's food supply. High doses of UV radiation can reduce the yield of basic crops such as soybeans. UV-B, the most dangerous variety of ultraviolet, penetrates scores of meters below the surface of the oceans. There the radiation can kill phytoplankton (one-celled plants) and krill (tiny shrimplike animals), which are at the very bottom of the ocean food chain. Since these organisms, found in greatest concentrations in Antarctic waters, nourish larger fish, the ultimate consumers -- humans -- may face a maritime food shortage. Scientists believe the lower plants and animals can adapt to rising...
Over the years, researchers have discovered that the DNA that makes up the 46 chromosomes in the human cell is not as stable as once thought. Mutations in DNA have long been known to occur, but they usually involve relatively small changes in genetic material. For example, between parent and child, there may be a switch in the sequence of nucleotide bases that are the building blocks of DNA. Sometimes an entire gene can jump to another place on a chromosome. "But you don't usually see a big increase in the absolute number of bases within a single gene...
...common form of muscular dystrophy, the change can be far from negligible: a fragment of DNA on chromosome 19 appears to repeat itself more frequently with every generation. Just what triggers the repetition is a mystery. Researchers surmise that a hitch occurs while DNA is being copied in the cell, much as the same bar of music repeats on a scratched record. The DNA repeat gets worse with each generation, just as with each playing of a flawed record, the music stutters for a longer period. "Presumably the replication error occurs in the sperm or egg before conception," says molecular...