FIELD D 



Columns 12, 13, 14, 



15, 16, and 17 



SECONDARY COMPOUND 



The IBM punched card columns of this field (12 through 17) are used for coding a compound 

 other than the "test compound", i. e. , a "secondary compound". 



(The test compound is always expressed in Columns 1 through 8 on each IBM biology punched 

 card. On the Biology Code Sheet, the test compound's name and its Serial Number are written only 

 on the chemistry side, regardless of the number of lines of data coded on the sheet; this provision 

 eliminates the necessity of entering the name and Serial Number of the test compound for each line of 

 biological data when several lines are coded on a single Code Sheet. ) 



Examples of secondary compounds that are coded in Field D are (1) compounds whose actions 

 are antagonized or synergized by the test compound or (2) compounds whose metabolic fate (e. g. , 

 excretion), coded in Field T-2, is affected in some way by the test compound. 



The secondary compound can be coded only by a person having access to a reference file of 

 chemical names and Serial Numbers. In any case, the coder must always include in the written abstract 

 for this field the full name and all other information given about the secondary compound. 



A more thorough discussion of all the uses of Field D and specific directions are given in the 

 Key, including the uses of the following special symbols. 



* RADIOACTIVITY: To designate that the secondary 



compound is radioactive, place an asterisk in Column 16. 



* STANDARD OF COMPARISON: To designate that a compound 



is used as a standard of comparison for evaluation, place 

 an asterisk in Column 17. 



* MORE THAN ONE SECONDARY COMPOUND PRESENT AND 



ESSENTIAL: To designate that more than one secondary 

 compound is present and is essential to the action, place 

 the Symbol # in Column 16. 



25 



