HOW TO SEARCH LITERATURE
Dr Nazuk sharma
TO be discussed….
• What is literature?
• What is literature search?
• Purpose of literature search?
• Types of literature?
• Boolean searching
• How to search?
What is literature
A collection of all the scholarly writings on a topic
What is literature search
• Methodical search for all of the literature
published on a topic.
• An effective search of the literature can be
done quickly, but demands an organised and
systematic approach
• Important to keep records of the searches
made and the information found.
Purpose of a Literature Search
• Broadens your knowledge on a topic & helps us to be
updated.
• Review existing critical opinions/theories
• Identify current research findings on a topic
• Identify potential research methods or models you
could use in various studies & experiments
• Having carried out research it enabes comparison
with your own research findings
Types of Literature
1. Research Journals
• Original research Articles
• Commentaries/replies
• Reviews
2. Standard books
3. Online reports
 Census
 Research institutes
 Government organizations
4. Online
BOOLEAN SEARCHING
• Boolean searching is based on a system of
symbolic logic which was developed by
George Boole, who was a 19th century English
mathematician.
USING BOOLEAN
When performing a Boolean search, you
must first choose keywords that best
describe your topic.
Then you must connect the keywords
using operators.
The AND operator
• AND links terms together in a way that makes
your search more narrow. It tells the computer
that you want records that contain all the
words you specify.
• For instance, if you search only records
containing the words “Smoking” and “Lung
cancer” your results will return only those
articles containing BOTH terms.
AND
The purple space where they intersect represents all
the records that would be returned by the search
Smoking and Lung cancer
The OR operator
• OR broadens, or widens, your results.
• For instance, a search on smoking or lung cancer will
give you records that not only have both smoking
and lung cancer in them, but also the records that
contain only smoking and only lung cancer.
• Therefore, you will obtain more results by using the
OR operator.
OR
The purple space represents all the records that
would be returned by the search " smoking or
lung cancer."
The NOT operator
NOT is a term that allows you to exclude, or eliminate,
certain words from your search.
NOT
The purple spaces represent all the records that
would be returned by the search “smoking not
cancer," and “cancer not smoking.”
At Some Other Search Strategies
Let’s Look
* Truncation & ? Wildcards #
Truncation
• The truncation symbol (*) serves as a substitute
for any string of zero or more characters.
Example: therapy, therapies, therapeutics,
You could combine them all in an OR relationship:
(therapy OR therapies OR therapeutics OR
therapeutic)
But an easier way is by the use of truncation.
therap*
Type: “diarrh*”
finds articles with word :
- Diarrhea
- Diarrhoea
- Diarrheal
- Diarrhoeal
- etc.
Wildcards
• The wildcard symbol (?) serves as a substitute
for one character or none.
• For example the search m?cdonald retrieves
both mcdonald and macdonald
1
• Define your topic
2
• Choose the resources to search
3
• Choose your search terms
4
• Compile the strategy and run the search
5
• Find the full text
You should work through the 5 steps of an
effective literature search. Working logically
through these steps ensures your search is
focused, systematic and effective.
I’ve never done any searching before,
where should I begin?
What do you want the literature to tell you?
Ask questions…
Question x4 by Mike Coghlan
http://www.flickr.com/photos/mikecogh/4256561918/
Reproduced under a Creative Commons Licence
PICO Model
PICO or PECO is an acronym used to identify four
primary components of a well formulated clinical
question.
P = Patient Population or Problem
I = Intervention or Exposure
C = Comparison
O = Outcome
Which databases should I search?
This is step 2 of the literature search process. The databases you
choose depend very much on the search topic. Each database
covers a different topic or type of information and you must
choose the ones that are most appropriate for your search
question.
PubMed/Medline
Biomedicine and clinical
medicine
Embase
Biomedical and clinical
medicine
Global Health
International public health
Google Scholar
Information about books ad
journals
Cochrane Library
Healthcare interventions
CINAHL
Nursing and allied health
Popline
Reproductive and sexual
health
Web of Science
All academic disciplines,
good for social sciences
NLM
National library of medicine
Where to begin a search ?
Google - unfiltered haystack approach
Google scholar – a more scholarly approach
PubMed – Recent & advance search
How to search Google scholar
Google Scholar
Scholar.google.
com
Can search for
books and articles
Can do an
advanced search
Title links to
abstract and
possible source of
full text
Link to articles
that cited the
work
Link to related
articles
How to search PubMed
https://www.ncbi.nlm.nih.gov/pubmed
PubMed Home Page
Click MeSH Database
MeSH Database
Terms in the database are called
Medical Subject Headings or MeSH.
is a “controlled vocabulary list” of more than
25,000 subject headings.
10-15 MeSH are assigned to each article
in PubMed.
The MeSH index of 10-15 subject headings
is like a keyword abstract of the article.
MeSH are updated annually in December.
Create a Search Strategy Plan
Identify the question and key concepts:
advanced nursing practice and
trends in graduate nursing education
Write the search program using
medical subject headings (MeSH)
a
a
(Note: If there is a Boolean OR relationship,
start with the “OR” statement first.)
advanced nursing practiceEnter
a
a
Searchand click
Term Definitions
Tree Structures are
terms arranged in a hierarchy.
MeSH
Terms are listed from
broadest to narrowest.
If Advanced Practice Nursing
yields zero results, try using a
broader term such as: Nursing
Click Add to search builder
The first term is in
the search program “box”
MeSH
a
a
graduate nursing educationEnter
Searchand click
Sub-headings narrow the “meaning” of a MeSH term.
They are a “subset” of all the articles under the
MeSH term: Education, Nursing, Graduate
1) Check the box next
to the subheadinga
Click Add to search builder
Boolean Logic - AND
advanced nursing
practice
education, nursing,
graduate/
trends
and
Click Search PubMed
Final Search Strategy
Search Results
PubMed identifies
29 articles
Select Filters
such as English
…and published during
the last 5 years.
Results are reduced
From 29 to 22
Click Show additional filters
Scroll to article # 18
Select article(s).X
X
Scroll up
Click Display Settings:
Select Abstract, change to Pub Date to
sort to most recent articles appearing first,
Applythen click
Click for MeSH terms index.+
.
Click Send to: and select
File to save citations to a file on your computer or
Clipboard to temporarily store selected citations or
E-mail to send citations to self or colleague
…or click icon for full text.
Article type
Search field tags
• Helpful tags (also appear in Advance search)
• [au] author
• [ti] title
• [tiab] title/abstract
• [tw]text words
• Examples : Microbiocides[ti] OR HIV[tw]
Other Searching Featuresa
a
1) MeSH, phrase, & title word searching
2) Truncation
Enter and click a
a
human genome Search
3) Then click Add to search builder
2) Select AND
1) Check the box next
to the MeSH heading
Click Search PubMed
Enter and click“dark matter” Search
PubMed identifies
7 articles
Enter and click“dark matter” [ti] Search
Results are narrowed to 5
Truncation
Enter gene* to truncate.
PubMed locates:
gene
generation
generated
genetic
Sign into NCBI
Register for an account
Create account
Search Filters
Click My NCBI
Click Manage Filters
Select English & Humans
Select Properties
Under Publication Types select
Under Subsets select
You may select up to 15 filters. These selections override the
default filters of Review and Free Full Text. These filters apply
to searches run while signed into you’re My NCBI account.
Example of results with
customized filters
Example of results with
standard filters
Save Search
Click Save Search
Click Training & Tutorials for hands-on learning.
Click Save to receive automatic
email updates of newly
published articles on this topic.
To conclude
we can now see that an effective
search of the literature can be done
quickly, but demands an organised
and systematic approach
Hope they will set you on the right path
to . . .
How to search literature

How to search literature

  • 1.
    HOW TO SEARCHLITERATURE Dr Nazuk sharma
  • 2.
    TO be discussed…. •What is literature? • What is literature search? • Purpose of literature search? • Types of literature? • Boolean searching • How to search?
  • 3.
    What is literature Acollection of all the scholarly writings on a topic
  • 5.
    What is literaturesearch • Methodical search for all of the literature published on a topic. • An effective search of the literature can be done quickly, but demands an organised and systematic approach • Important to keep records of the searches made and the information found.
  • 6.
    Purpose of aLiterature Search • Broadens your knowledge on a topic & helps us to be updated. • Review existing critical opinions/theories • Identify current research findings on a topic • Identify potential research methods or models you could use in various studies & experiments • Having carried out research it enabes comparison with your own research findings
  • 7.
    Types of Literature 1.Research Journals • Original research Articles • Commentaries/replies • Reviews 2. Standard books
  • 8.
    3. Online reports Census  Research institutes  Government organizations 4. Online
  • 9.
    BOOLEAN SEARCHING • Booleansearching is based on a system of symbolic logic which was developed by George Boole, who was a 19th century English mathematician.
  • 10.
    USING BOOLEAN When performinga Boolean search, you must first choose keywords that best describe your topic. Then you must connect the keywords using operators.
  • 11.
    The AND operator •AND links terms together in a way that makes your search more narrow. It tells the computer that you want records that contain all the words you specify. • For instance, if you search only records containing the words “Smoking” and “Lung cancer” your results will return only those articles containing BOTH terms.
  • 12.
    AND The purple spacewhere they intersect represents all the records that would be returned by the search Smoking and Lung cancer
  • 13.
    The OR operator •OR broadens, or widens, your results. • For instance, a search on smoking or lung cancer will give you records that not only have both smoking and lung cancer in them, but also the records that contain only smoking and only lung cancer. • Therefore, you will obtain more results by using the OR operator.
  • 14.
    OR The purple spacerepresents all the records that would be returned by the search " smoking or lung cancer."
  • 15.
    The NOT operator NOTis a term that allows you to exclude, or eliminate, certain words from your search.
  • 16.
    NOT The purple spacesrepresent all the records that would be returned by the search “smoking not cancer," and “cancer not smoking.”
  • 17.
    At Some OtherSearch Strategies Let’s Look * Truncation & ? Wildcards #
  • 18.
    Truncation • The truncationsymbol (*) serves as a substitute for any string of zero or more characters. Example: therapy, therapies, therapeutics, You could combine them all in an OR relationship: (therapy OR therapies OR therapeutics OR therapeutic) But an easier way is by the use of truncation. therap*
  • 19.
    Type: “diarrh*” finds articleswith word : - Diarrhea - Diarrhoea - Diarrheal - Diarrhoeal - etc.
  • 20.
    Wildcards • The wildcardsymbol (?) serves as a substitute for one character or none. • For example the search m?cdonald retrieves both mcdonald and macdonald
  • 21.
    1 • Define yourtopic 2 • Choose the resources to search 3 • Choose your search terms 4 • Compile the strategy and run the search 5 • Find the full text You should work through the 5 steps of an effective literature search. Working logically through these steps ensures your search is focused, systematic and effective. I’ve never done any searching before, where should I begin?
  • 22.
    What do youwant the literature to tell you? Ask questions… Question x4 by Mike Coghlan http://www.flickr.com/photos/mikecogh/4256561918/ Reproduced under a Creative Commons Licence
  • 23.
    PICO Model PICO orPECO is an acronym used to identify four primary components of a well formulated clinical question. P = Patient Population or Problem I = Intervention or Exposure C = Comparison O = Outcome
  • 24.
    Which databases shouldI search? This is step 2 of the literature search process. The databases you choose depend very much on the search topic. Each database covers a different topic or type of information and you must choose the ones that are most appropriate for your search question. PubMed/Medline Biomedicine and clinical medicine Embase Biomedical and clinical medicine Global Health International public health Google Scholar Information about books ad journals Cochrane Library Healthcare interventions CINAHL Nursing and allied health Popline Reproductive and sexual health Web of Science All academic disciplines, good for social sciences NLM National library of medicine
  • 25.
    Where to begina search ? Google - unfiltered haystack approach Google scholar – a more scholarly approach PubMed – Recent & advance search
  • 26.
    How to searchGoogle scholar
  • 27.
    Google Scholar Scholar.google. com Can searchfor books and articles Can do an advanced search
  • 28.
    Title links to abstractand possible source of full text Link to articles that cited the work Link to related articles
  • 29.
    How to searchPubMed https://www.ncbi.nlm.nih.gov/pubmed
  • 30.
  • 31.
  • 32.
    MeSH Database Terms inthe database are called Medical Subject Headings or MeSH. is a “controlled vocabulary list” of more than 25,000 subject headings. 10-15 MeSH are assigned to each article in PubMed. The MeSH index of 10-15 subject headings is like a keyword abstract of the article. MeSH are updated annually in December.
  • 33.
    Create a SearchStrategy Plan Identify the question and key concepts: advanced nursing practice and trends in graduate nursing education Write the search program using medical subject headings (MeSH)
  • 34.
    a a (Note: If thereis a Boolean OR relationship, start with the “OR” statement first.) advanced nursing practiceEnter a a Searchand click
  • 35.
  • 36.
    Tree Structures are termsarranged in a hierarchy. MeSH
  • 37.
    Terms are listedfrom broadest to narrowest. If Advanced Practice Nursing yields zero results, try using a broader term such as: Nursing
  • 38.
    Click Add tosearch builder
  • 39.
    The first termis in the search program “box” MeSH
  • 40.
  • 41.
    Sub-headings narrow the“meaning” of a MeSH term. They are a “subset” of all the articles under the MeSH term: Education, Nursing, Graduate
  • 42.
    1) Check thebox next to the subheadinga
  • 43.
    Click Add tosearch builder
  • 44.
    Boolean Logic -AND advanced nursing practice education, nursing, graduate/ trends and
  • 45.
  • 46.
  • 47.
  • 48.
  • 49.
  • 50.
  • 51.
  • 52.
  • 53.
  • 54.
  • 55.
    Select Abstract, changeto Pub Date to sort to most recent articles appearing first, Applythen click
  • 56.
    Click for MeSHterms index.+
  • 57.
    . Click Send to:and select File to save citations to a file on your computer or Clipboard to temporarily store selected citations or E-mail to send citations to self or colleague
  • 58.
    …or click iconfor full text.
  • 60.
  • 61.
    Search field tags •Helpful tags (also appear in Advance search) • [au] author • [ti] title • [tiab] title/abstract • [tw]text words • Examples : Microbiocides[ti] OR HIV[tw]
  • 62.
    Other Searching Featuresa a 1)MeSH, phrase, & title word searching 2) Truncation
  • 63.
    Enter and clicka a human genome Search
  • 64.
    3) Then clickAdd to search builder 2) Select AND 1) Check the box next to the MeSH heading
  • 65.
  • 66.
    Enter and click“darkmatter” Search
  • 67.
  • 68.
    Enter and click“darkmatter” [ti] Search
  • 69.
  • 70.
  • 71.
    Enter gene* totruncate.
  • 72.
  • 73.
  • 74.
    Register for anaccount Create account
  • 75.
  • 76.
  • 77.
  • 78.
    Select English &Humans Select Properties
  • 79.
  • 80.
  • 81.
    You may selectup to 15 filters. These selections override the default filters of Review and Free Full Text. These filters apply to searches run while signed into you’re My NCBI account.
  • 82.
    Example of resultswith customized filters
  • 83.
    Example of resultswith standard filters
  • 84.
  • 85.
  • 86.
    Click Training &Tutorials for hands-on learning.
  • 87.
    Click Save toreceive automatic email updates of newly published articles on this topic.
  • 88.
    To conclude we cannow see that an effective search of the literature can be done quickly, but demands an organised and systematic approach
  • 89.
    Hope they willset you on the right path to . . .