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A fat substitute made its public debut in an oatmeal raisin cookie last month. The substitute, a coarse beige-yellow flourlike substance called Nu-Trim, contains high percentages of ß glucans--the soluble fibers that lower cholesterol through the same mechanisms as oat bran. While those mechanisms are not well understood, they are effective, remarked the product's developer, George E. Inglett , of the U.S. Department of Agriculture (USDA) Agricultural Research Service in Peoria, Ill. Ear

Photo: Keith Merrill/Ogden Entertainment LIFE IN THE BALANCE: In the emerald realm of the Amazon rain forest, a baby lies on a giant lily pad. This scene is from the film Amazon, which is being shown at science centers and museums as an added attraction for other exhibits on rain forests. Museums featuring life science exhibits--from hands-on displays showing how the human body works at the California Science Center in Los Angeles to a comprehensive look at the subject of biodiversity at the A

Zebrafish The key to understanding vertebrate development and the origins of human birth defects may lie with the fishes--that is, with the zebrafishes (Danio rerio). Using zebrafish mutants produced primarily by chemical mutagenesis, researchers have, in recent years, turned the popular aquarium pets, originally from India, into invaluable tools for understanding the finest genetic details of vertebrate embryogenesis. Zebrafishes are the only viable candidate for large-scale vertebrate mutage

As first complimentary oligonucleotide is poised for market, questions remain about mechanisms A drug that halts an AIDS-related eye infection could be the first antisense therapy to reach the market. However, whether the drug can truly be called "antisense" depends on some specifics--such as the ability to bind to targeted messenger RNA (mRNA) but avoid clinging to other proteins. Representatives of the drug's manufacturer, Isis Pharmaceuticals Inc. of Carlsbad, Calif., say fomivirsen (Vitra

RNA BEGINNINGS Research that began as a quest to see how plant cells become infested with viruses ended in questions about the origins of life. In that quest, Steven A. Lommel of North Carolina State University in Raleigh and colleagues used a reporter gene to follow the viral activity in its host. But the gene didn't light up as expected during their study of the genome of a red clover necrotic mosaic Dianthovirus (RCNMV) genome [T.L. Sit, et al, Science, 28:1829-32, Aug. 7,1998]. The genome

Scientific investigation of life's origins, once mostly a theoretical enterprise, has gained momentum in recent years as biologists have discovered hardy microbes in extreme terrestrial habitats and possible hints of lifelike structures in a Martian meteorite. One recent sign that the field is alive and well is the establishment of a new NASA Specialized Center of Research and Training (NSCORT) for the Study of Origins of Life in the Albany area of New York. MULTIPLE YEARS: James Ferris, profe

LEFT AND RIGHT: A wild type st 45 Xenopus embryo with rightward heart looping and counter-clockwise gut coiling is shown on the left. In contrast, a st 45 embryo that was injected with Pitx2 at the 4 cell stage exhibits leftward heart looping and clockwise gut coiling. When it comes to organ orientation, one gene can make the difference between right and left. That gene, Pitx2 , has been identified as the key to asymmetry, or "handedness," the property describing on which side of the body the

Chimpanzees share almost all their gene sequences with humans, and this closeness has made them ideal animal models for many human diseases. But similarities between humans and nonhuman primates go beyond genetics. Nonhuman primates are very social animals, travel long distances to find food, sometimes live on the fringes of the wild, and often become afflicted with diseases closely resembling those of humans. PREP FOR FLIGHT: Handlers prepare chimpanzee Ham, one of the NASA "astrochimps," f

It was fitting, perhaps, that Cumulina the cloned mouse made her debut at a press conference in New York City on Gregor Mendel's birthday, July 22. As the father of genetics, Mendel explained genetic variability. As the first mouse cloned from an adult's cell nucleus, Cumulina represents the ultimate in genetic uniformity. So far, 50 mice have been cloned, some through three generations. Photo: ProBio America Inc. THREE GENERATIONS: Researchers at the University of Hawaii cloned these three g

Although these three alternatives to injections don't look alike, the mechanisms by which they protect against diseases have much in common. 

Recent research has shed new light on the sleep/wake cycle. In two papers featured on the cover of the July 10 issue of Cell (J.L. Price et al., Cell, 94:83-95, 1998; B. Kloss et al., Cell, 94:97-107, 1998), scientists from Rockefeller University reported the discovery of a gene in Drosophila, dubbed double-time (dbt). The dbt gene is believed to regulate the molecular cycles underlying circadian rhythms--patterns of activity that, in humans, regulate body temperature, mental alertness, pain

Rita Colwell GOOD-BYE ... ALMOST On July 10, University of Maryland bid a bittersweet "almost farewell" to Rita Colwell, who left the position of president of the university's Biotechnology Institute (UMBI) to become director of the National Science Foundation (NSF). Colwell's farewell to UMBI is only partial--she has committed herself to one day of research per week in her laboratory, where she studies, particularly, the bacteria that cause cholera. On hand July 10 to congratulate her and wi