论文部分内容阅读
目前世界发行的有关遗传学的期刊数量很多,据不完全统计,有100多种期刊登载这方面的论文。仅美国出版发行的《遗传学和分子生物学的最新进展》所参考的期刊就有3000余种,年刊载论文题目20.000条。文摘期刊、题录期刊以及遗传学图等文献检索书籍和期刊,显得十分重要。这类供检索原始文献用的文献,我们统称之为二次文献。二次文献的作用就是将分散、零乱、数量繁多的原始文献,经过整理、分类、编制索引使之成为有系统的文献,以便于查找与利用。现时刊行的遗
Currently, there are a large number of journals on genetics distributed in the world. According to incomplete statistics, there are over 100 kinds of journals that publish papers in this field. There are more than 3,000 journals referenced in the latest issue of “Advances in Genetics and Molecular Biology” published and distributed in the United States alone, with 20.000 articles published annually. Digest journals, bibliographic journals and genetics and other literature retrieval books and periodicals, it is very important. Such documents for the retrieval of original documents, we collectively referred to as secondary literature. The role of secondary literature is to disperse, messy, a large number of original documents, after sorting, classification, indexing to make it a systematic literature to facilitate the search and use. The current issue of the legacy