PUBMED简介（PUBMED abstract）
Source: life.fudan.edu/sjs/pubmedjj.htm
A brief introduction to PubMed retrieval system
PubMed retrieval system bi.v/PubMed /
The PubMed system was developed by the National Center for Biotechnology Information (NCBI), an online retrieval system for retrieving MEDLINE and PreMED-LINE databases. MEDLINE is the most important bibliographic abstracts database of
U.S.National Library of Medicine, which covers medicine, nursing, dentistry, veterinary medicine, health care and basic medicine. More than 4000 kinds of biomedical journals have been collected in more than 70 countries and regions in the world, with over 1000 entries of bibliography abstracts in 1966.
PreMEDLINE is a temporary database of medical literature. It receives new data every day, providing users with basic bibliographic entries and abstracts, which are moved to MEDLINE once a week after indexing and processing.
臣功再欣PubMed also accepts the document entry data provided by the publisher via electronic communication, which is illustrated with [MEDLINE, record, in, process], and is marked with the [Record as supplied by publisher]. The daily entries are constantly sent to the PreMEDLINE database, but some entries due beyond MEDLARS database scope, will never be replaced by PreMEDLINE or MEDLINE entry, for example in the comprehensive scientific journal (Science or Nature) on the table the geography etc..
Main features of PubMed system
PubMed search
The use of the Details key
The use of the --URL key for storage retrieval policy
绿植物的新陈代谢Feature column (Feature Bar) introduced
Search results display, save, print
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Main features of PubMed system
波罗的海三国1. vocabulary automatic conversion function (Automatic, Term, Mapping)
In the search questions box of the PubMed home, type a search word, and the system will use the following 4 tables or indexes sequentially to retrieve the retrieved words and then retrieve them.
(1) MeSH conversion table (MeSH, Translation, Table), including MeSH words, see words, sub topics, etc.. If the system has found the word matching the search word, it will automatically translate it into the corresponding MeSH word and TextWord word (Title noun and abstract word). For example, type
"Vitamin H", and the system converts it to "Biotin [MeSH Tems] OR Vitamin h [Textword]" after retrieval.
天体物理学(2) of the conversion table (Journal Tanslation Table), including full name, abbreviation of MEDLINE and ISSN. The conversion table can type of name into the "MEDLINE Name]" after the retrieval of the abbreviation [Journal. For example, in the search questions box, type "New England Journal of medicine", and PubMed converts it to "N, Engl, J, Med, [Journal, Name]".大沽河
(3) phrase list (Phrase, list). The unified medical language system in the table and form phrases from MeSH containing synonyms or different English vocabulary writing (UMLS: Unified Medical Language System) and supplementary concept (material) name [Supplementary Concept (Substance) Name]. If the PubMed system is not found and the retrieval word matching the words in the MeSH and of the conversion table, will find a short list.
(4) author index (Author, Index). If the word entered does not find the matching word in the above table, or the typed word is a phrase followed by an 1~2 letter, the PubMed is the author index. If you still can't find matching words,
PubMed will break the word and repeat the automatic vocabulary conversion process until the word matches the word entered. If there are still no matching words, individual words are joined together (in AND) to retrieve in all fields.
For example, "single cell", the system automatically divides it into two words: "single" and "cell" retrieval, and its
retrieval expression is "single AND cell"". To check the conversion of the search term, click the "Details" key.
2. word retrieval function
合成肽PubMed allows the use of * numbers as a wildcard for word retrieval. If you type 'bacter *', the system will find the words in the previous section, such as bacteria, bacterium, bacteriophage, and bacter, and retrieve them separately. If the word is less than 150, PubMed will be one by one word retrieval, if more than 150 (such as Staph*), PubMed will display the following warning: "Wildcard search for'term*'used only the first Lengthen the root word 150 variations. to search for all endings". Truncation function is limited to words and is invalid for phrases. Such as: "infection*" includes "infections", but does not include "infection control" and so on.
When using the truncation function, the PubMed system automatically turns off the lexical conversion function.
3. mandatory search function
As mentioned above, the PubMed homepage and search box type questions a phrase and click "Go", with the high speed automatic conversion function to find the corresponding word matching and retrieval system; however, when the type of words, no words, PubMed will enter the words off after the automatic repeat vocabulary conversion process, if still no match, the system will be decom
posed into words and phrases, AND together in all fields in search. Obviously, the results of this retrieval are
not consistent with the user's requirements. Therefore, PubMed allows double quotation marks ("" "" ") to enforce systematic phrase retrieval. For example, in the PubMed page retrieval type "Single cell" question box, and use double quotes, and then click "Go", the system will be as an integral phrase retrieval in all fields in the database.
Using double quotation marks automatically turns off the lexical conversion function.
4. link function
(1) linking relevant documents. Each document in the PubMed system has a related literature link. In the display state of the retrieval results, there is a "Related Articles" hyperlink on the right of each record. Click on the chain, the system shows the relevant documents from high to low according to the relevance of the document. Using the search history (History) button can further restrict the relevant literature. Click on "History", enter the relevant search numbers into the query box, and then type additional conditional words, and finally click "Go"". If you type "#7 AND english[la]" in the query question box, the search can be further limited to the English literature.
(2) link NCBI (National, Center, for, Biotechnology, Information) database. PubMed built hyperlinks on its home page with 5 NCBI databases. These databases include: Protein[amino acid sequence database (protein), Nucleotide (DNA sequence) database, Popset (population, phylogenetic or mutation sequence) database, Structure (molecular structure model) and
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