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<title>MeSH on the Web. NLM Technical Bulletin. Sep-Oct 1997</title>
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<meta name="DC.Subject.Keyword" content="Medical Subject Headings" />
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<meta name="DC.Subject.Keyword" content="National Library of Medicine" />
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<meta name="DC.Subject.Keyword" content="MeSH Terms" />
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<meta name="DC.Subject.Keyword" content="Pharmacologic Action" />
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<meta name="DC.Subject.Keyword" content="Publication Type" />
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<meta name="DC.Subject.Keyword" content="Subheading" />
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<meta name="DC.Subject.Keyword" content="E-mail" />
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<meta name="DC.Subject.Keyword" content="ELHILL" />
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<meta name="DC.Subject.Keyword" content="MEDLINE" />
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<a href="/nlmhome.html"><img src="/pubs/techbull/tb_graphics/tbhead4.gif" border=0 alt="NLM Technical Bulletin"/></a>
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<h3><em>NLM Technical Bulletin</em> 1997 Sep-Oct; 298</h3>
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<hr />
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<hr />
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<center><strong>In This Issue:</strong></center>
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<hr />
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<p>
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<a href="so97_yep.html">Year-End Processing (YEP)</a>
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</p>
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<p>
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<a href="so97_sdi.html">YEP of Stored and Saved Searches and Automatic SDI's</a>
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</p>
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<a href="so97_chem_tox.html">CHEMLINE® and TOXLIT® Retire</a>
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<p>
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<a href="so97_catav.html">Rebuilding of CATLINE®/ AVLINE®</a>
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</p>
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<p>
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<a href="so97_mesh_attract.html">MeSH Coming Attractions</a>
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</p>
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<p>
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<img src="/pubs/techbull/tb_graphics/blutri.gif" alt="dot" height=10 width=10/> MeSH on the Web
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</p>
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<p>
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<a href="so97_gold.html">Gold Standard Search</a>
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<p>
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<a href="so97_technote.html">Technical Notes</a>
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</p>
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<hr />
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<center><strong>Appendixes:</strong></center>
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<hr />
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<p>
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<a href="so97_med_update.html">MEDLINE - 1998 Weekly Update Schedule</a>
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</p>
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<p>
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<a href="so97_aids_update.html">AIDSLINE - 1998 Weekly Update Schedule</a>
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</p>
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<p>
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<a href="so97_hstar_update.html">HealthSTAR - 1998 Weekly Update Schedule</a>
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</p>
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<p>
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<a href="so97_data_update.html">NLM Databases - 1998 Monthly Update Schedule</a>
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</p>
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<p>
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[This link was removed because it is no longer valid] 1998 NLM Pricing Algorithm Chart
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</p>
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<p>
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<a href="so97_price_sched.html">MEDLARS Pricing Schedule</a>
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</p>
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<hr />
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<center><strong><a href="/pubs/techbull/current_issue.html">Current Issue</a></strong></center>
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<center><strong><a href="/pubs/techbull/tb.html">Home</a></strong></center>
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<center><strong><a href="/pubs/techbull/back_issues.html">Back Issues</a></strong></center>
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<hr />
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<center><strong><a href="/pubs/techbull/new_index.html">Index</a></strong></center>
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<hr />
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</td>
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<td valign=top width=440>
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<center><h2>MeSH on the Web</h2></center>
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<p>
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1998 MeSH files are available for download from the MeSH Web site at <a href="/mesh/meshhome.html">http://www.nlm.nih.gov/mesh/meshhome.html.</a>
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</p>
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<p>
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The following formatted versions of the entire 1998 MeSH vocabulary are currently available:
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</p>
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<p>
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<strong>1998 MeSH Trees in ASCII Format</strong><br />
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MeSH descriptors with the tree numbers that place the heading in a hierarchical arrangement. Sorted by tree number.
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</p>
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<p>
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<strong>MeSH in MARC Format</strong><br />
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MeSH vocabulary in the USMARC authority format include MeSH descriptors, qualifiers (subheadings), and descriptor-qualifier combination records. Supplementary Chemical Records are not included. For best results, please use a graphical interface.
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</p>
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<p>
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<strong>1998 MeSH in ASCII Format</strong><br />
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MeSH descriptors, qualifiers (subheadings), and Supplementary Chemical Records (through September 1, 1997), in ASCII format. This is a new tagged format and is similar to the ELHILL Unit Record format but the data are encoded in ASCII, not EBCDIC. This format also includes Supplementary Chemical Records, with those data through September 1, 1997. See Figure 1 below.
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</p>
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<hr />
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<h3><a name="fig1" id="fig1">Figure 1 - Sample ASCII MeSH Format Record:</a></h3>
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<pre>
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*NEWRECORD
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RECTYPE = D
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MH = Gene Library
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PRINT ENTRY = DNA Library:T028:ACX:EQV:NLM (1998):961031:abcdef
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PRINT ENTRY = Gene Bank:T028:NON:EQV:NLM (1990):890221:abcdef
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ENTRY = Bank, Gene
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ENTRY = Banks, Gene
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ENTRY = DNA Libraries
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ENTRY = Gene Banks
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ENTRY = Gene Libraries
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ENTRY = Libraries, DNA
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ENTRY = Libraries, Gene
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ENTRY = Library, DNA
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ENTRY = Library, Gene
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MN = G05.275.195
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MN = G05.331.599.110.410
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FX = DNA, Recombinant
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MH_TH = NLM (1990)
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ST = T028
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AN = do not confuse with GENOMIC LIBRARY; do not
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confuse X ref GENE BANK with BIOLOGICAL
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SPECIMEN BANKS; no qualif
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PI = Base Sequence (78-89)
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PI = Cloning, Molecular (80-89)
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PI = Plasmids (78-85)
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MS = A large collection of cloned DNA fragments
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from a given organism, tissue, organ, or cell
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type. It may contain complete genomic sequences
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(GENOMIC LIBRARY) or complementary DNA
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sequences, the latter being formed from
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messenger RNA and lacking intron sequences.
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PM = 90
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HN = 90
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MED = 2295
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MED = *224
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M90 = 3520
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M90 = *357
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M85 = 253
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M85 = *33
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M80 = 1
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CATSH = CAT LIST
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DA = 890515
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RO = O:PXP
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RO = A:SJN
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RO = M:AGS
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MR = 970620
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DC = 1
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DX = 900101
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UI = D015723
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</pre>
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<hr />
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<p>
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ASCII MeSH contains all data that are present in ELHILL MeSH, including cross-references and scope notes. Online descriptions of the data elements in each file are available for each of the three record types: Descriptor Data Elements, Qualifier (subheadings) Data Elements, and Supplementary Chemical Record Data Elements. Publication Types (PT) are encoded as MeSH Descriptors even though they appear in the PT field and not the MH field in the MEDLINE citations.
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</p>
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<h3>Restrictions on Use</h3>
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<p>
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There is no charge for downloading MeSH data from the NLM Web site. However, use of the ASCII MeSH file data is subject to conditions which are detailed in the memorandum of understanding that must be completed before downloading data.
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</p>
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<h3>Availability</h3>
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<p>
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The data for Descriptors and Qualifiers are updated annually and users of the data are encouraged to obtain the new year's data.
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</p>
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<p>
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Supplementary Chemical Records are updated in ELHILL MeSH on a daily basis and the current file in ASCII MeSH is complete through September 1, 1997. The Supplementary Chemical Records will be added to ASCII MeSH periodically. The data elements that require a descriptor MeSH heading value, such as the Heading Mapped-To (HM) element, have been updated to match a descriptor in 1998 MeSH.
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</p>
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<p>
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MeSH Descriptors and Qualifiers are also published annually in print as the Medical Subject Headings, Annotated Alphabetic List. Some Descriptor data are also published in Medical Subject Headings, Tree Structures and Permuted Medical Subject Headings.
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</p>
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<h3>File Format</h3>
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<p>
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Each MeSH record is indicated by a separate line, preceding the record, consisting of the string: *NEWRECORD. (See <a href="#fig1">Figure</a> 1 on this page.) Each element or occurrence is contained on a single line. Each line contains an element name and value, for example, MH = Appendicitis. The same is true for longer, free-text fields such the Annotation and Scope Note. (The longest occurrence/line in the 1998 files is in the descriptor file and is 1160 characters.)
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</p>
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<p>
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For data elements that are multiply-occurring, each element occurs on a separate line, for example, the MeSH Tree Number:
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</p>
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<dl>
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<dd>MN = E05.909.262.607.790</dd>
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<dd>MN = E05.909.262.620.670.620</dd>
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</dl>
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<p>
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Generally, data in ASCII MeSH files are in 7-bit ASCII format. The only exception is that in 41 descriptor records, the Annotation element contains one or more diacritical characters. No attempt was made to translate these characters so they may appear differently in different displays.
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</p>
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<p>
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The file extensions are .bin rather than .txt so that Web browsers will prompt to save rather than automatically trying to display the relatively large text files (up to 36MB). The binary download should have no adverse effects for most users. The lines will usually be transmitted with only a line feed character (decimal 10) and not also a carriage return (decimal 13). Please contact the MeSH Section at the address given in Questions and Assistance at the end of this article if you have questions.
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</p>
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<h3>Numbers of Records in the 1998 MeSH</h3>
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<p>
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The number of records in the file for the three record types are shown below.
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</p>
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<pre>
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<strong>Record Type</strong> <strong>Total Records</strong>
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Descriptors (MeSH headings,
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including Publication Types) 18,934
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Qualifiers (subheadings) 787
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Supplementary Chemical Records *95,617
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* through September 1, 1997
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</pre>
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<h3>Additional 1998 MeSH Files Available</h3>
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<p>
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<strong>1998. Pharmacologic Actions of a given drug</strong>
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</p>
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<p>
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<strong>1998. Drugs with a given Pharmacologic Action</strong>
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</p>
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<p>
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<strong>1998 New Headings with Scope Notes</strong><br />
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Main headings that are new in 1998 with scope notes (definitions), cross-references, and other information.
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</p>
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<p>
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Sample Entry:
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</p>
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<p>
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<strong>Amino Acid Substitution</strong><br />
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The naturally occurring or experimentally induced replacement of one or more amino acids in a protein with another. If a functionally equivalent amino acid is substituted, the protein may retain wild-type activity. Substitution may also diminish or eliminate protein function. Experimentally induced substitution is often used to study enzyme activities and binding site properties.
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</p>
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<dl>
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<dt>Previous indexing:
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<dd>Amino Acid Sequence (66-97)</dd>
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</dl>
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<p>
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<strong>1998 Replaced Headings</strong><br />
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Main headings that have changed form for 1998 or have been deleted.
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</p>
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<h3>Questions and Assistance</h3>
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<p>
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For questions concerning the content of ASCII MeSH, contact:
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</p>
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<dl>
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<dd>Stuart Nelson, M.D.</dd>
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<dd>Head, Medical Subject Headings </dd>
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<dd>National Library of Medicine </dd>
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<dd>8600 Rockville Pike</dd>
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<dd>Bethesda, MD 20894</dd>
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<dd>Phone: 301-496-1495</dd>
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<dd>FAX: 301-402-2002</dd>
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<dd>E-mail: <a href="mailto:nelson@nlm.nih.gov">nelson@nlm.nih.gov</a> </dd>
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</dl>
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<p>
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For questions concerning distribution, format, etc., contact:
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</p>
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<dl>
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<dd>Jacque-Lynne Schulman</dd>
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<dd>Medical Subject Headings </dd>
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<dd>Phone: 301-496-1495</dd>
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<dd>FAX: 301-402-2002 </dd>
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<dd>E-mail: <a href="mailto:schulman@nlm.nih.gov">schulman@nlm.nih.gov</a> </dd>
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</dl>
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<p>
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For further information about leased databases from the National Library of Medicine contact:
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</p>
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<dl>
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<dd>Jane L. Rosov</dd>
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<dd>MEDLARS Management Section</dd>
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<dd>Phone: 301-496-7706 or 888-346-3656</dd>
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<dd>FAX: 301-496-0822</dd>
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<dd>E-mail: <a href="mailto:janer@nlm.nih.gov"> janer@nlm.nih.gov</a></dd>
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</dl>
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<dd><em>--prepared by Jacque-Lynne Schulman</em></dd>
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