is the official Web site of the U.S. National Library of Medicine. It provides an international comprehensive bioinformatics database retrieval function.

MEDLINE is the official Web site of the U.S. National Library of Medicine. MEDLINE is an international comprehensive bibliographic database of biomedical information produced by The National Library of Medicine (NLM), which is the most authoritative database of biomedical literature in the world. The contents include all the contents of Index Medicus (IM) and Index to Dental Literature and International Nursing Index, covering basic medicine, clinical medicine, environmental medicine, nutrition The Index to Dental Literature and the Index to Dental Literature, part of the International Nursing Index, cover basic medicine, clinical medicine, environmental medicine, nutrition, health, occupational medicine, health management, health care, microbiology, pharmacology, social medicine, etc.

MEDLINE contains the literature of more than 3400 biomedical journals published in more than 70 countries and regions in the world since 1966, with nearly 9.6 million records. At present, 300,000-350,000 records are added annually, reported in the form of title and abstracts, of which 75% are in English and 70%-80% have English abstracts.

By the end of 1988, nearly 20 institutions had been approved to convert the MEDLINE database and distribute MEDLINE's CD-ROM products, including Silver Platter, Cambridge, Dialog, and others. Although the retrieval functions, retrieval instructions, and data structures of these companies' products are basically similar, there are also differences. Since most of the products introduced in China are from Silver Platter, we will use Silver Platter's MEDLINE CD-ROM as an example to introduce the use of CD-ROM retrieval system.

Medline mainly provides literature on biomedical and life science fields, with data going back to 1949. It can be retrieved by subject, subtopic, keyword, title, author, journal article, ISSN, publication, year of publication, country of publication, etc. The other three are the same, but advanced and express are superior and easy to retrieve, and standard requires less updating and does not require a CD-ROM tower. The frequency of the MEDLINE CD-ROM file replenishment and update is once a month, and can be run in DOS and WIN environments.

NLM: The U.S. National Library of Medicine is operated and managed by the U.S. federal government and is the largest medical library in the world. It was formerly known as the Library of the Office of the Secretary of Public Health, which was established in 1836. It is located in the National Institutes of Health in Bethesda, Maryland. This library was established in 1836 and has a collection of nearly 12 million titles.