摘要:

A. Background "Plus ça change, plus c'est la même chose." In a review article published more than 30 years ago, the present author stated " … several scales, all masquerading under the name pH, are in common use. Many investigators are thinking and computing in terms of one definition and measuring a different quantity."1An improvement toward an understanding of the nature of the practical pH value has been seen in the last three decades, but the precise manner of interpreting these values is still largely a mystery. To emphasize this situation, one has only to survey a dozen modern texts used in the teaching of analytical chemistry. The results of such an examination are summarized in Table 1. As observed earlier … "this state of confusion results in part from the impossibility of determining exactly … the molality and the activity of hydrogen (hydronium) ion for a buffer solution of moderate concentration."1

ISSN:0007-8980    

DOI:10.1080/10408348108542727

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Nucleic acid components play central roles in biochemistry. The purine and pyrimidine base pairs are the chemical basis of the nucleic acids and their composition is of basic interest in genetic and other biomedical studies. In addition, nucleotides, nucleosides, or their bases are important as regulators in metabolic processes, as messengers and as antibiotics and chemotherapeutic agents.

ISSN:0007-8980    

DOI:10.1080/10408348108542728

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor