研外文摘要库PPT课件

1、.,1,外文医学期刊摘要库及全文库Medical Journal Databases Abstracts 心源性休克Shock, Cardiogenic. Trucation stops at the end of a term, that is, it does not process beyond a space. Truncating a word in a multi-word search may result in an unexpected phrase search. For example the search, fetus infection* maternal will

2、treat fetus infection* as a phrase.,截词检索时，系统将关闭自动匹配功能。不启用主题词表，属于在all fields中的，多词形的，字面检索。,.,14,3、Searching for a phrase,Enclose the phrase in double quotes: “kidney allograft” Use a search tag: kidney allografttw Use a hyphen: first-line Truncate: kidney allograft*,短语检索时，系统将关闭自动匹配功能。不启用主题词表，属于在all fi

3、elds中的，单个词的，字面检索。,.,15,检索词： kidney allograft，automatic mapping功能开启，检索结果27714篇。,检索词： “kidney allograft”，automatic mapping关闭，检索结果1796篇。,.,16,4、Searching by a specific field,高级检索状态Advance:Use the Advanced search Builder to search for terms in a specific search field. 通过检索选项选择字段 基本检索状态Basic: You may als

4、o search a specific field, by adding a search tag to a term The search tag must be enclosed in square brackets. 篇名ti 主题词mh 刊名ja 著者 au 文本词tw 字母大小写不敏感，字段前有无空格不敏感。Case and spacing do not matter (e.g., crabs mh = Crabsmh).,.,17,Search Field Description and Tags,著者地址,著者：姓（全称）+名（缩写）,著者：姓名全称，姓与名顺序任意，2002年以

5、后的文献,第一著者，用姓前（全）+名后（缩）,最后一个著者，一般是通讯作者，用姓前（全）+名后（缩）,文章的题名,期刊的名称,.,18,著者地址：Affiliation AD If available, affiliation includes the institution name and address (including e-mail address) of the first author of the article as it appears in the journal, e.g., cleveland ad AND clinic ad.,.,19,所有字段All Field

6、s ALL Untagged terms and terms tagged with all fields are processed using Automatic Term Mapping. Terms that do not map are searched in all search fields except for Place of Publication and Transliterated Title. Terms enclosed in double quotes or truncated will be searched in all fields and not proc

7、essed using automatic term mapping.,.,20,文本词Text Words TW Includes all words and numbers in the title, abstract, other abstract, MeSH terms, MeSH Subheadings, Publication Types, Substance Names, Personal Name as Subject, Corporate Author, Secondary Source, Comment/Correction Notes, and Other Terms (

8、see Other Term OT above) typically non-MeSH subject terms (keywords), including NASA Space Flight Mission, assigned by an organization other than NLM.,.,21,5、Combing searches,Advancehistory AND OR NOT 逻辑算符级别相等：PubMed processes all Boolean operators left to right 可用（）改变运算顺序。,.,22,6、Filters,1)检索结果页面的S

9、idebar filters:article types, text availability, publication dates, species, languages, sex, subjects, journal categories, ages and search fields.,检索结果页面左边：sidebars, show additional filters,.,23,2)关于数据库的一些预置设计(用于检索式的表达) Loallsb/filter:citations with LinkOut links in PubMed, free full textsb/filter:c

10、itations that include a link to a free full-text article, full textsb/filter:citations that include a link to a full-text article loprovf1000sb/filter:citations that include in F1000 database pubstatusaheadofprint:citations that appear on the web prior to their publication in final or print format.

11、hasabstract:Most citations in PubMed to articles published before 1975 do not include abstracts.,.,24,3)关于数据库的一些快捷检索方式 Clinical Queries Filters,.,25,4）也可自设filters 需注册my ncbi帐号。 可选择standard filters（勾选即可） 也可自建custom filters(需自设有意义的检索式),勾选standard filters,自设检索式，制定filers,设定好的filters:standard & custom,.,

12、26,检索结果页面显示用户自行勾选或制定的filters,方便筛选出常用的限定条件,.,27,检索途径与方法,基本检索Basic search 各种筛选条件sidebar filters 内置筛选子集如pubstatusaheadofprint Details的作用 高级检索 作者检索 期刊检索 主题检索 快捷检索功能 检一篇特定文献 临床医生的快捷检索,.,28,基本检索Basic search,用Lung cancer smoking在基本检索中检索，浏览检索结果，用Details了解系统制订的检索式，并修改检索式。 浏览sidebar filters,了解各种限定条件的含义，尝试用不同f

13、ilters限定后，浏览结果。 不同类型的filters之间逻辑关系为AND； 同类型的filters条件之间逻辑关系为OR,.,29,高级检索Advanced search,可调用限定字段检索 可逻辑组配不同检索词 可在History切换不同的检索过程 可逻辑组配不同的检索式 演示举例,.,30,主题检索MeSH,受控词表MeSH (Medical Subject Headings) is the NLM controlled vocabulary thesaurus used for indexing PubMed citations. Use the MeSH database to f

14、ind MeSH terms, including Subheadings, Publication Types, Supplementary Concepts and Pharmacological Actions, and then build a PubMed search. The MeSH database can be searched by MeSH term, MeSH Entry Term, Subheading, Publication Type, Supplementary Concept, or MeSH Scope Note.,.,31,主题词与副主题词组配使用,Me

15、SH is the National Library of Medicines controlled vocabulary thesaurus. It consists of sets of terms naming descriptors in a hierarchical structure that permits searching at various levels of specificity. MeSH descriptors are arranged in both an alphabetic and a hierarchical structure. At the most

16、general level of the hierarchical structure are very broad headings such as Anatomy or Mental Disorders. More specific headings are found at more narrow levels of the twelve-level hierarchy, such as Ankle and Conduct Disorder. There are 26,853 descriptors in 2013 MeSH. There are also over 213,000 en

17、try terms that assist in finding the most appropriate MeSH Heading For example, Vitamin C is an entry term to Ascorbic Acid. In addition to these headings, there are more than 214,000 headings called Supplementary Concept Records (formerly Supplementary Chemical Records) within a separate thesaurus.

18、,2万多主题词，83个副主题词，两者组配使用，精确表达文章主要内容,.,32,检索举例,以Lung cancer smoking为例，演示检索过程 对比基本检索与主题检索的不同检索结果,.,33,基本检索形成的误检：字面检索,研究主题并非“吸烟与肺癌”，而是关于一种新药的疗效研究，摘要中出现了smoking字眼,.,34,主题检索形成的漏检（符合需求的新记录，未及标引主题词）,非洲，人群中吸烟普及度及其对肺癌病死率的影响,.,35,主题检索与基本检索比较,检索效率：主题检索由于是人工词表控制和人工标引检索，所以更能表达文章主要内容，查准率较高（但也受人工标引质量的影响）。基本检索是系统自动匹配

19、原理，设计理念是查全，所以查全率较高，但误检文献也较多。 时效性：主题标引需要一定的标引时间，所以主题检索方式对新录入文献（尚未标引）易造成漏检，可以通过基本检索方式补充。 主题词表的容量有限，对新兴学科中没有入选的主题概念不适用。这种情况也需通过基本检索方式来检索。,.,36,其它一些快捷检索方式,Single citation matcher 表单式，方便查找单篇文章 Clinical queries 专门为临床医生设计，菜单式。,.,37,二、浏览Displaying,Format Summary Abstract Medline Items per page Sort by Recently Add