منابع مشابه
The conjugated steroids. IV. The hydrolysis of ketosteroid sulfates.
Specific hydrolysis of the separate groups of steroid conjugates appeared to offer the simplest technique for achieving the hydrolysis without chemical modification of the steroids (3-5). A partial solution to this problem was offered when it was found that steroid glucuronides could be hydrolyzed specifically by the use of /3-glucuronidase concentrates of either animal (Cohen (3)) or bacterial...
متن کاملA facile hydrolysis-solvolysis procedure for conjugated bile acid sulfates.
Methods for hydrolyzing and solvolyzing conjugated bile acid sulfates were compared on reference mixtures of conjugated and unconjugated bile acid sulfates gas-liquid chromatography to assess recovery, and thin-layer chromatography and zonal scanning to define the products occurring after hydrolysis. Conventional methods in which solvolysis preceded vigorous alkaline saponification gave incompl...
متن کاملRare Earth Elements Profile
Definitions and characteristics The rare earth elements (REE) (sometimes referred to as the rare earth metals) are a group of 17 chemically similar metallic elements, including the 15 lanthanides, scandium and yttrium. The lanthanides are elements spanning atomic numbers 57 (lanthanum, La) to 71 (lutetium, Lu) (Table 1). The lanthanides all occur in nature, although promethium, the rarest, only...
متن کاملPreparation of rare earth metals
The production of over 400 grams of pure gadolinium metal by reduction of the anhydrous chloride by calcium in tantalum vessels is described; yields were over 97%. The use of the same techniques in an attempt to prepare yttrium metal were partially successful.
متن کاملMechanism of Rare Earth Incorporation and Crystal Growth of Rare Earth Containing Type-I Clathrates
Type-I clathrates possess extremely low thermal conductivities, a property that makes them promising materials for thermoelectric applications. The incorporation of cerium into one such clathrate has recently been shown to lead to a drastic enhancement of the thermopower, another property determining the thermoelectric efficiency. Here we explore the mechanism of the incorporation of rare earth...
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ژورنال
عنوان ژورنال: Journal of the American Chemical Society
سال: 1914
ISSN: 0002-7863,1520-5126
DOI: 10.1021/ja02182a001