New evidence pushes back age of sex-determining chromosomes
...e most part does not exchangegenetic material. The exception to the rule is that the tips of the X and Ychromosomes recombine during male meiosis in humans. Page's and Bruce Lahn's analysis of the sex-determining chromosomes, whichwas published in the October 29, 1999, issue of the journal Science ,reveals t...When opposites don't attract: Understanding why may support new biomaterials, Science paper suggests
...tly, however, researchers have found an intriguing exception to this rule,which may have implications for the development of new materials forsophisticated sensors and optical devices, says Nily R. Dan, an assistantprofessor in UD's Department of Chemical Engineering, in a July 16 Sciencearticle. "Our work add...Common genes form new family tree for animals
... ago, and that gave rise to most animals (with the exception ofjellyfish and sponges) living today, said Jennifer K. Grenier, a Howard HughesMedical Institute Fellow, UW-Madison graduate student and a lead author of thereport. The new study was based on exploration of so-called Hox genes in three distinctkinds...Genetic Research Boosts Understanding Of Iron's Path Through Body, Diseases Of Iron Metabolism
... organs looked normal. Curiously, the only exception to this was the nervous system. Thescientists detected a wave of cell death in the brains of the mutant embryos ata developmental stage when no brain cells die normally. This could mean thatdeveloping neurons need so much energy that only the transfe...Insect Taste Buds Target Of Control Method
...er-tasting put the beetles off their food. One exception is cucurbitacin, an extremely bitter chemical found in the fruit skins and roots of squashes and other cucurbits. Adult beetles will feed on anything coated with cucurbitacin to the exclusion of other foods. Farmers currently mix ground-up squash ...... are the most primitive known fossil birdswith the exception of the famous Archaeopteryx, discovered in 1861. Ironically,while Archaeopteryx is more primitive, it fits the stereotypical conception of abird much better than the more advanced Shuvuuia deserti. The new discoveryillustrates the complexity of the...Hormone Control Of Rare Leukemia Sheds Light On Molecular Basis Of Cancer
Often in science it's the exception that illuminates the rule. Thus,when researchers at the University of Pennsylvania Medical Center clarified thebiochemical mechanism behind acute promyelocytic leukemia (APL), theysimultaneously elucidated a process implicated in many other cancers. ...Genetics Of Obesity And Of The Response To Chronic Overfeeding
...ained in all family studies with the only apparent exception beingthe Pima Indians. Our own results from the Quebec family Study suggests that there are linkagesbetween body fat, as assessed from hydrodensitometry, and markers on 1p32-p22. In addition, significant linkages have also been obtained in QFS for...Low Cholesterol? Reduced Sodium? What Do These Terms Really Mean?
...A maximums of 5g and 150 mg respectively. With the exception of the minestronesoup, cholesterol was also significantly overestimated, compared to the FDAlimit of 20mg. In the NLEA, the FDA definition of "free" requires a food productto have only physiologically inconsequential amounts of a component. Thiscorre......Alzheimer's and Parkinson's disease. With the exception of early fetal cells, all cells appear to have poisonousproteins stashed beneath their membranes. Like spies with cyanide pills underthe skin, cells pack these suicidal enzymes away for extreme emergencies,releasing them only when neighboring cells d...