Applied hydrobiology and wastewater documentation code

After several years of practical experience in the processing of algological literature for easy retrieval our "Phycological DocumentationCode" was published (JAVORNICKY et al. 1973). By this pragmatic system over 25.000 articles were coded by a group of Czechoslovakian and German colleagues and stored automatically on the computer of the City works of Dortmund via its Institut für Wasserforschung. Since 1973 many hundreds of retrieval jobs were run by the computer for individual algologists, scientific institutions and commercial companies. The journal "Algological Studies" became the first to publish the coded contents of every article appearing since 1973 thus enabling us to have these materials available for retrieval in less than a month after publication. Until 1978 the authors, Dr. N. Jeeji Bai (Madras), Mr. Joost Groeneweg, Dr. Jir1 Popovsky (Prague) and others did their best to code about 3ooo phycoloqical articles per year and to provide a printed file card including an abstract for each publication to some fifty subscribers in fourteen countries. This considerable effort was terminated in 1979, after the Institute of Alqal Research at Dortmund had become part of the Nuclear Research Centre in Jülich and shifted its major field of interest from applied phycoloqy to wastewater treatment. After one year of attempts to search the literature by tapping several commercial retrieval systems we found that the quantity and specificityof the informations obtained was definitely below the level of our own system which was, therefore, revived in a reduced and modifiedway. With the available capacity we can no more aim at a complete coverage of the current literature on algae. Instead we have expanded the scope by including sewaqe treatment, technology and related subjects into our documentation. In addition, we have to reduce the annual number of entries and to concentrate on topics and journals which are of more immediate relevance for our work. Nevertheless, the system will probably remain a useful source for all scientists and institutions sharing our fields of interest. The modified scope of our Applied Hydrobiology and Wastewater Documentation Code and the need to incorporate a number of additional codons is the major reason for the present publication of a revised list of codons. Tbe new list 02 does still contain all codons vital for those who are only concerned with algology. We also want to offer the users of the system an updated version includinq a number of addenda which accumulated over the years plus a still incomplete list of generic names of algae. For details of the latter and the bibliographical data it is referred to the Index Nominum Genericorum Plantarum (FARR et al. 1979)