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For years, microbiologists characterized the Archaea as obligate extremophiles that thrive in environments too harsh for other… Expand The observation that purified yeast glutamine synthetase is rapidly inactivated in a thiol-containing buffer yet retains activity… Expand ABSTRACT The current perception of evolutionary relationships and the natural diversity of ammonia-oxidizing bacteria (AOB) is… Expand Because of their wide use in molecular modeling, methods to compute molecular surfaces have received a lot of interest in recent… Expand The mineral nutrient needed in greatest abundance by plants is nitrogen. Plants, however, must compete for nitrogen in the soil… Expand beta-Amyloid is a 39- to 43-amino-acid neurotoxic peptide that aggregates to form the core of Alzheimer disease-associated senile… Expand Almost any kind of threat to homeostasis or stress will cause plasma glucocorticoid levels to rise. The increased levels have… Expand Buthionine sulfoximine (S-n-butyl homocysteine sulfoximine), the most potent of a series of analogs of methionine sulfoximine… Expand The distribution of glutamine synthetase was determined in rat brain by ultrastructural immunocytochemistry. Except for trace… Expand Light microscopy immunohistochemical techniques were used to examine the distribution of glutamine synthetase in rat brain… Expand