外文参考型数据库

❖Example: mimic* will find all terms that begin with the letters m-i-m-i-c-; e.g., mimic, mimics, mimicing
Stopword List
A
a, about, again, all, almost, also, although, always, among, an, and, another, any, are, as, at
Contents
❖1 Introduction ❖2 Searching PubMed ❖3 Managing Results ❖4 Getting Articles ❖5 Additional Tools
Introduction of PubMed
❖A database developed by the NCBI at the NLM available on the Web
Spell Check Feature
❖Suggests alternative spellings for search terms that include misspellings.
❖Terms entered with a search tag (e.g., [mh]; [majr]; [tw]) will not generate alternative spellings
外文参考型数据库
四种最知名的相关数据库 ❖PUBMED ❖EMBASE ❖Biosis Preview ❖SciFinder Scholar
PUBMED
Course objective
❖Understand PubMed's scope and content
❖Be able to perform a basic search in PubMed
MEDLINE Citations
❖The subject scope of MEDLINE is biomedicine and health
❖The publications are scholarly journals, a small number of newspapers, magazines, and newsletters
▪ The term is truncated: kidney allograft*
Truncation
❖Place an asterisk (*) at the end of a string of characters to search for all terms that begin with that string
❖Be able to build a search using MeSH and PubMed search tools (Details, Limits, History, etc.)
❖Be able to manage your results using display, sort, save, print, e-mail and order features
❖Provide a record for an article before it is indexed with MeSH and added to MEDLINE or converted to out-of-scope status
❖Displayed with the status tag [PubMed - in process]
See an interactive view of Entrez links at http://www.ncbi.nlm.nih.gov/Database/
What can PubMed do
❖Provides free access to MEDLINE ❖Links to full-text ❖Provides Advanced search, Clinical
❖MEDLINE Citations ❖Publisher Supplied Citations ❖In-process Citations ❖Some OLDMEDLINE Citatioins ❖Books……
MEDLINE Citations
❖Generally 1946 to the present
❖These citations were received electronically from publishers never become MEDLINE citations
❖Displayed with the status tag [PubMed]
Publisher
Electronic Citations Publisher Supplied Citations
Publisher Supplied Citations
❖Be supplied by publishers directly to PubMed
❖Displayed with the status tag [PubMed - as supplied by publisher]
In process citations
(1) Basic Searching
▪ Find citations to articles about indigestion and abdominal pain
❖About 45% are published in the U.S., about 91% are published in English, and about 83% have English abstracts written by authors of the articles.
❖Status tag [PubMed – indexed for MEDLINE]
❖ Once all terms are mapped, the records are promoted to status [PubMed – indexed for MEDLINE]
❖Sample OLDMEDLINE citations in PubMed
Non-MeSH Indexed Citations
❖Or, National Library of Medicine’s homepage: http://www.nlm.nih.gov
Query Box aka
Search Box
Phrase Searching
❖ PubMed searches for phrases under these conditions:
H
had, has, have, having, here, how, however
I
i, if, in, into, is, it, its, itself
J
just
K
kg, km
M
made, mainly, make, may, mg, might, ml, mm, most, mostly, must
❖One of several databases under NCBI’s Entrez retrieval system
❖Currently includes over 21 million bibliographic citations.
The following diagram illustrates the relationships between some of the information resources in Entrez
Queries search filters…… ❖Links to related articles & resources ❖"My NCBI". ❖Includes a spell checker feature ❖Adds citations Tuesday through
Saturday
What’s in PubMed
▪ The phrase is enclosed in double quotes: (The absence of a search tag indicates the search should be conducted in All Fields.) “kidney allograft”
▪ The term is hyphenated: first-line
B
be, because, been, before, being, between, both, but, by
C
can, could
D
did, do, does, done, due, during
E
each, either, enough, especially, etc
F
for, found, from, further
Flow Diagram of Citations Indexing
[PubMed-as supplied by Publisher]
In Process Citations [PubMed-in process]
[PubMed]
MEDLINE
OLDMEDLINE
[PubMed-indexed for MEDLINE] [PubMed-OLDMEDLINE]
OLDMEDLINE Citations
❖About 2 million citations (most with no abstracts) are to journal article citations from 1946 to 1965
❖OLDMEDLINE records carry the status tag [PubMed – OLDMEDLINE] until all original subject terms are mapped to current MeSH
PubMed
Contents
❖1 Introduction ❖2 Searching PubMed ❖3 Managing Results ❖4 Getting Articles ❖5 Additional Tools
Accessing PubMed
❖Directly at: http://www.pubmed.gov
T
than, that, the, their, theirs, them, then, there, therefore, these, they, this, those, through, thus, to
U
upon, use, used, using
V
various, very
W
was, we, were, what, when, which, while, with, within, without, would
❖Currently, citations from 5,516 worldwide journals in 39 languages
❖Since 2005, between 2,000-4,000 completed references are added each day Tuesday through Saturday
N
nearly, neither, no, nor
O
obtained, of, often, on, our, overall
P
perhaps, pmid
Fra Baidu bibliotek
Q
quite
R
rather, really, regarding
S
seem, seen, several, should, show, showed, shown, shows, significantly, since, so, some, such
▪ The phrase is found in the MeSH, journal, author or investigator tables or indexes during the automatic term mapping process
▪ The phrase is entered with a search tag: kidney allograft [tw]