Issues in Science and Technology Librarianship | Fall 2001 | |||
DOI:10.5062/F40P0X05 |
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formerly
Chemical Sciences Librarian
Science & Engineering Library
Ohio State University
A citation analysis of dissertations accepted in the Department of Chemistry at The Ohio State University between 1996-2000 was performed as a way to determine material use. The 30 dissertations studied generated a total of 3,704 citations. Types of materials cited, currency of literature, and dissertation topics were all analyzed.The current results corroborate past research by other authors. Journal articles were cited more frequently than monographs: 85.8% of the citations were journal articles and 8.4% of the citations were monographs. The results of this study may be used to assist OSU and other universities in chemistry collection development.
One type of in-house evaluation often used by librarians to assist in collection maintenance is citation analysis. This technique provides insight on emerging and obsolescent research areas. Citation analysis is an excellent unobtrusive method to determine which resources doctoral students are using (Buttlar 1999). According to Buchanan & Herubel (1994), "regular in-house collection evaluation enhances the management of collections in any research library's public service and collection development efforts for short and long term objectives". The purpose of this study was to analyze the citations in local chemistry dissertations during the period 1996-2000 to assist the Ohio State University Science & Engineering Library chemical sciences librarian in determining which materials are most heavily used and which materials are needed to improve the collection. Material type cited most, journals cited most, and currency of literature cited most were all examined.
The Department of Chemistry at OSU is fully accredited by The American Chemical Society and consistently ranks in the top twenty schools for excellent graduate programs. (See {http://www.usnews.com/usnews/edu/beyond/gradrank/gbchem.htm}.) Roughly 350 graduate students and postdoctoral fellows make up the department. They conduct research in analytical, biological, environmental, inorganic, organic, physical, or theoretical and computational chemistry. Approximately 27 chemistry Ph.Ds are granted each year.
The seminal citation-based science related study by Gross & Gross (1927) determined which chemistry periodicals best served a small college library. The literature reveals that librarians all over the world have used this method to improve their collections. Lal and Panda (1996) created a ranked list of the 100 most frequently cited core periodicals in plant pathology after examining 20 dissertations from the Department of Plant Pathology at Rajendra Agricultural University. Edwards (1999) determined which journal titles were used by polymer science and polymer engineering graduate students. Her use of citation analysis along with shelving counts enabled her to make merited cancellation choices. Walcott's (1991) national study of randomly selected geoscience dissertations revealed that 79.6% of the citations were from serials. With nearly 97% of the serials coming from English language publications, she suggested that geoscience librarians cut back on purchasing foreign language publications. Potential serial reductions were the impetus for Walcott's (1994a) citation analysis of graduate students' biology theses and dissertations for the years 1989-1992. She found that they cited "approximately 95% serials and only 5% books (Walcott 1994a). McCain and Bobick (1981) examined the citation patterns of biology faculty, doctoral and second-year graduate students to determine their core journal needs. These researchers asserted that citation analysis was useful in determining current and future journal use for their library.
While citation analysis of dissertations for collection development is well known, Walcott (1994a) and Lee (2000) both agree that few bibliometric studies have examined science and engineering dissertations. Even fewer studies have examined chemistry dissertations to ascertain materials most heavily used. An evaluation of the citation analyses literature in science and engineering shows that most studies focus on journal or monograph use. Youngen (1998) examined electronic preprints in the astronomy and astrophysics literature. For scientists in those fields he argues that "preprints have become a much more common form of scientific information exchange." Youngen (1998) concluded that electronic preprints were cited in the most influential astronomy and astrophysics journals and were an important resource for primary research information.
Studies by Walcott (1994b), Hurd (1992) and Henkle (1938) examined journal article citation patterns to uncover the interdisciplinary nature of scientific disciplines such as marine science, chemistry, and biochemistry respectively. According to the literature, citation analysis has been used by librarians in various disciplines to eliminate costly low use/unused journals, purchase needed materials and ascertain core journals needed for patron use and to reveal the most active research in a particular area. The present study builds on previous studies and seeks to use this method to aid in collection development in the area of chemistry. Ideally, examination of past material use (particularly journals) should suggest future material use by chemistry doctoral students.
Title pages and reference sections were photocopied from each of the 30 dissertations. Information extracted from each included doctoral student's name, year of graduation, year of cited work, location of cited work (SEL, other), number of citations, and total of each cited title broken into three categories: journals, monographs, and other. The "other" category consisted of patents, proceedings, technical reports, and unpublished papers (including dissertations and theses). Communication via phone or e-mail, talks, articles submitted or in press, unpublished results, and unidentified software were considered "miscellaneous" (134 citations). Unknown abbreviated journal titles were verified using CASSI (Chemical Abstracts Service Source Index) and the journals indexed in the {Beilstein database list}.
According to Edwards (1999), "citation analysis can also be used to determine a core list of journals critical to local users and representative of the research needs of the collection." Citations in the current study referred to 441 journal titles. Table 1 lists the twenty journal titles needed to satisfy 61% of the journal citations in this study. Accordingly, only 12 titles were needed to cover 50% of the journal citations. Lal and Panda (1996) and Edwards (1999) found similar results in citation analyses of journals in plant pathology and polymer science, respectively. These statistics suggest that a small percentage of journals contain a high percentage of the references found in the above studies. The monograph statistics present evidence of much more scattering than the journals as several different titles were used. Molecular Spectra and Molecular Structure was cited the most (nine times). Tied with three citations each were: Ab initio Molecular Orbital Theory, Electronic Aspects of Organic Photochemistry and Molecular Cloning: a Laboratory Manual. Twenty of the 312 titles were cited twice.
Materials in the current study were cited back as far as 1817 (Annales de Chimie et de Physique) and the most current material was cited as late as 1999 (several titles). All thirty dissertations were reviewed in the fall of 2000. The number of citations ranged from a low of 24 to a high of 491 and averaged about 123 citations each.
Additionally, the subject areas for the 30 dissertations mainly covered Organic Chemistry (10), Analytical Chemistry (6), Physical Chemistry (6), Inorganic Chemistry (4) and Biochemistry (4).
A significant number of citations appeared in duplicate form (19%) and 16% of the citations were for articles that were submitted/in press (see Table 2). It is presumed that since students work closely with their advisor this may explain why they are able to cite articles that have not been officially published. Previous research by Rusch-Feja and Siebeky (1999) and Mercer (2000) suggests that users prefer electronic articles versus photocopied print articles. With this in mind, it was confounding that with all the access to online full-text journal articles that OSU provides to students, the author observed that less than 1% of the citations referred to the online version. Sixty percent of the top twenty core journals cited were available online at OSU between 1997-1998. Especially for dissertations after 1998, it could be that students consulted online journals but were unaware of citing style guides that described the electronic format.
Knowing which resources doctoral students require should enable collection managers to more adequately serve them. The method in this study will help chemistry librarians determine which materials are being used at our libraries. Ultimately, it is also assumed that an improved collection for chemistry will better support the research needs of future chemistry doctoral students.
While this study was done in a local fashion, it would be beneficial to replicate this study at some of the other top twenty universities and compare the results. Are the core materials similar? Are articles submitted/in press or unpublished results cited as heavily? These answers could prove to be helpful to large and small university libraries seeking to improve their existing chemistry collections.
Table 1. Top Twenty Core Journals Cited | ||
---|---|---|
Rank | Journal Title | Number of Citations |
1 | Journal of the American Chemical Society | 364 |
2 | Journal of chemical physics | 341 |
3 | Journal of physical chemistry | 175 |
4 | Chemical physics letters | 144 |
5 | Analytical chemistry | 100 |
6 | Tetrahedron letters | 96 |
7 | Biochemistry | 89 |
8 | Journal of organic chemistry | 81 |
9 | Journal of biological chemistry | 71 |
10 | Nature | 70 |
11 | Science | 60 |
12 | Journal of the Chemical Society | 58 |
13 | Inorganic chemistry | 53 |
14 | Acta crystallographica | 47 |
15 | Journal of chromatography | 42 |
16 | Proceedings of the National Academy of Sciences of the United States of America | 35 |
17 | Journal of molecular biology | 33 |
18 | Molecular physics | 31 |
19 | Tetrahedron | 30 |
20 | Angewandte chemie | 27 |
Table 2. Miscellaneous citations | |
---|---|
Duplicate citation | 26 |
Submitted/in press articles | 22 |
Incomplete citation | 15 |
Unpublished results | 12 |
Software | 11 |
Personal communication | 7 |
Internet page | 4 |
Discussion/Talk | 4 |
Total | 134 |
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