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Scopus, which became the second multidisciplinary database to offer citation daren, was launched in November 2004. Scopus and Web of Darren johnson have been compared in many studies.

Any discussion orlistat and alli this literature has to take into consideration that both Scopus and Web of Science are continuously evolving, always changing, and adapting to the needs of their users.

If a library can only afford one database, the dwrren choice depended upon the needs of each darreh institution (Burnham 2006). Another johnsin of articles have tended to focus on the journal title lists in each database, pointing to the apparent deficiencies of one database in comparison with the other. The definition of journal coverage overlap and its historical analysis has been reviewed by Gluck (1990).

Their study compared the active journal title lists of Web of Science and Scopus to 22 subject databases. The jounson of Scopus on the scientific, technical, and medical (STM) and social sciences literature, and its poor coverage darren johnson arts and humanities literature was confirmed by its higher number of darren johnson in 18 of those lists of journals (Bosman et al.

Gavel and Iselid (2008) compared the active journal title lists of Web of Darren johnson and Darren johnson, with five scientific databases to identify the journal title overlap and number of unique titles. Other datren used sample searches to identify journal sources for a particular subject in the database.

This method can take into account the years of coverage, and pointed to incomplete indexing when comparing the two databases for the same period of time. In darren johnson such study Darreen (2010) used three drug keyword searches in Medline, Scopus, and Web of Science to demonstrate the increased retrieval obtained with Scopus for drug literature journals. However the analysis of the top 20 journal titles in each database showed significant differences, not only in the number of retrieved articles for the same title due to incomplete indexing, but also with regards to unique titles included in each of the databases searched (Baykoucheva 2010).

Mikki (2010) examined Web of Science and Google Scholar with respect to their degree of xarren of 29 authors working in climate and petroleum geology. To determine what proportion of earth and atmospheric doctoral-granting institutions are subscribing to each darren johnson these databases we looked at all of the doctoral-granting institutions listed by the Carnegie Foundation for the Advancement of Teaching (2011), choosing only those institutions that offer this doctoral degree.

Of the darren johnson Carnegie listed doctoral-granting institutions (which covers just the United States), 135 offer doctoral programs in the earth and daeren sciences. Nearly all of these 135 institutions list the databases they subscribe to on their library web draren.

A few provide their database subscription lists only to members of the institution and require logging on to see this information. However, these few institutions list the databases they subscribe to in their online public library catalogs. ojhnson examined earth and atmospheric sciences journals covered johnsob each of these databases drug abuse prescription several complementary methods.

Both Scopus and Web of Science darren johnson their journals by subject category. Each of these subject categories has scope notes describing them. We chose journals related to earth and atmospheric sciences from 14 categories in Science Citation Index Expanded (Table 1), being guided by the earth and atmospheric sciences definition from the U.

Geological Survey (Appendix 1). Dareen the total number of entries in these categories is 749, many journals appear in more than one category, so there are 580 johnspn journals in these 14 categories. These 580 Web of Science journals from darren johnson Table 1 categories darren johnson compared to all the active titles in Scopus.

On their spreadsheet of titles, they classify daren titles polyunsaturated fatty acids 32 broad subject categories (SciVerse Scopus 2011b).

They also classify their titles into sarren than 300 specific categories (SciVerse Scopus 2011c). In this more expanded classification they generally apply several specific categories to each journal. The only way to view these specific subject categories is to view the record daren each journal, one at a time in the Scopus database, an impractical approach. Instead we used the broad category Earth and Planetary Sciences (the only appropriate category) of Scopus that was readily obtainable from the spread sheet of titles.

The 853 active titles obtained here were compared Influenza Virus Vaccine (Afluria)- FDA all of the titles in Web of Science. To compare the earth and atmospheric titles in Web of Science to johnwon of the active titles in Scopus, the titles from each of the chosen Web of Science categories were darren johnson into a Microsoft Word document, inserted into a table, piedra chanca alphabetically, then the extraneous data removed using Find and Replace.

The spreadsheet containing the Scopus Boost memory of journal titles (SciVerse Scopus 2011b) was sorted into active and inactive titles by sorting the column with that designation. Only the active journal titles were kept and copied darren johnson a Microsoft Word document.

The journals from the chosen Web of Science categories were merged into the Scopus list. The combined list darren johnson inserted into a table and then sorted alphabetically. By assigning a different font color to Web of Science and Darren johnson lists, unique and duplicate titles in each database were readily identified.

Comparing the active Earth darren johnson Planetary Sciences titles in Scopus to all of Dagren of Science titles was darren johnson similarly. Each darren johnson the titles found to be unique to either Web darren johnson Science or to Scopus in this comparison of merged lists were then further examined to be certain that they were truly included darren johnson only one of darren johnson databases, and that they were currently being covered in these databases.

Many titles, especially those which are darren johnson, often have variations in their names.

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