CONVENTIONS 



The naming of enzymes is not an easy task. On the one hand, there are the more 

 trivial names with their occasional confusions — on the other, there are the official 

 names in the " Report of the Commission on Enzymes " (1961) which are reasonably 

 precise but often unwieldy. I have usually chosen the former because I feel most 

 readers will recognize these more readily, but frequently I have taken an interme- 

 diate course which probably will not please anyone. It is much more accurate to 

 write NADH:menadione oxidoreductase than to use the designation NADH oxidase 

 or NADH dehydrogenase, since the former name indicates the substrate and acceptor 

 used. In addition it is cumbersome to use D-xylulose-5-phosphate D-glyceraldehyde- 

 3-phosphate-lyase (phosphate-acetylating) instead of phosphoketolase, yet there is no 

 doubt that this longer term accurately describes the enzyme. There are also prefer- 

 ences in nomenclature, for various reasons. I never cared much for the term invertase; 

 I prefer to call it [3-fructofuranosidase, although it is clumsier, but not as much so 

 as P-D-fructofuranoside fructohydrolase. In other instances the older and shorter 

 names are more pleasing to me and I imagine to others. I have tried to use enzyme 

 names which, at least, can be found in the index of the " Report of the Commission 

 on Enzymes," and some cross referencing of names has been included in the index. 

 There are certain instances of inconsistency which I do not particularly regret. 



As in the first volume, concentrations have been given as millimolar (mM) except 

 when designated otherwise, and in other matters the conventions given there have 

 been retained. 



SYMBOLS 



duroquinone 

 durohydroquinone 

 standard oxidation-reduc- 

 tion potential (pH = 0) 

 oxidation-reduction poten- 

 tial at specified pH (usually 7) 

 effective dose or concentra- 

 tion for X per cent 

 ethylenediaminetetraacetate 

 enzyme-inhibitor complex 

 Embden-Meyerhof (path- 

 way) 



