منابع مشابه
Characterization of High Impedance Faults in Solidly Grounded Distribution Networks
High Impedance Fault (HIF) detection is increasingly a concern of distribution network protection engineers. Practical methods to deal with HIFs are in great demand in the USA, where HIFs are not detected by conventional protection devices. The lack of a globally accepted description of HIFs is a difficulty for HIF detection. In the effort to understand and explain HIFs, we have carried out a t...
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This review reports some novel (or improved) synthetic methods for preparing a number of aromatic (carbocyclic and predominantly heterocyclic) organomercurials, particularly those derived from theophylline, theobromine and uracil, as well as some novel haloand cyano-demercuration reactions. We have also synthesized the first stable organic derivative of mercury(I), viz. 1,8-bis(acetoxydimercuri...
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Evaluation of pain in patients with apparently solidly fixed total hip arthroplasty components.
The cause of pain in a patient with an apparently solidly fixed total hip arthroplasty can be difficult to elucidate. A detailed history, careful examination, and plain radiographs provide the most useful information, especially in excluding causes not primarily related to the hip. Determining whether the pain is related to the implant, to soft tissue, or to bone can require laboratory tests, r...
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While, intramolecular hydrogen bonds have attracted the greatest attention in studies of peptide conformations, the recognition that several other weakly polar interactions may be important determinants of folded structure has been growing. Burley and Petsko provided a comprehensive overview of the importance of weakly polar interactions, in shaping protein structures. The interactions between ...
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ژورنال
عنوان ژورنال: Science
سال: 2011
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.334.6057.739-b