0141759 



shoot apices, a reddish tint near the basal part of leaves and 

 curling and distortion of foliage. 



Zinc is an enzyme cofactor and binds pyridine nucleotides to 

 the protein portion of enzymes. Zinc atoms also stabilize the 

 structure of yeast alcohol dehydrogenase and are an essential 

 component in a variety of dehydrogenases, proteinases, peptidases 

 and zinc metal loenzyme carbonic anhydrase (NRC 1979) . Lack of 

 zinc, therefore, produces a general failure in the metabolic 

 system; RNA doesn't form, resulting in lowered protein formation, 

 less total nitrogen and DNA lesions. 



6.3 Computerized Data Base Utilized 



The following data bases have been computer searched for this 

 document. Descriptions are quoted directly from Dialog database 

 catalog for 1985. 



AGRICOLA File 10, 110 



1970-present, 2,826,000 records, monthly updates (National 

 Agricultural Library, Beltsville, MD ) . 



AGRICOLA (formerly CAIN) is the cataloging and indexing 

 database of the National Agricultural Library (NAL) . This massive 

 file provides comprehensive coverage of worldwide journal and 

 monographic literature on agriculture and related subjects. Since 

 AGRICCLA represents the actual holdings of the National Agricul- 

 tural Library, there is substantial coverage of all subject matter 

 normally contained in a very large library. File 110 contains the 

 citations for the years 1980-1978. File 10 contains citations 

 from 1979 to the present. Both files have similar format and 

 identical coverage and pricing. 



BIOSIS PREVIEWS Files 5, 55, 255 



1969-present , 4,566,000 records, biweekly updates 

 (BioSciences Information Service, Philadelphia, PA). 



BIOSIS PREVIEWS contains citations from both 3iological 

 Abstracts and 5:clrg:cal Abstracts/RRM (formerly entitled Bio- 

 research Index 1 , the major publications of BioSciences Information 



168 



