The Impact of Open Access Journals A Citation Study from Thomson ISI Recently, we have witnessed a major shift in the landscape of publishing. Open Access, once a minor tremor, now dominates discussion everywhere. Each week brings a new declaration from a major society, publisher, consortium, or government agency taking one side or another on this important topic. The number of open access journals is rising steadily, and new publishing models are rapidly evolving to test new ways to increase readership and access. Proponents of open access tout the increasing influence journals will have as they achieve higher readership through free access. Others contend that, over the long term, editorial quality is best supported through traditional business models. Do open access journals have greater impact than those that do not allow free access to all readers? This question is important at ISI because our mission is to help researchers find the highest quality scholarly literature, regardless of its business model. For more than 40 years ISI has employed a well-documented journal selection process, the aim of which is to provide access to the most important and influential scholarly journals. An essay on this subject is found at http://www.thomsonisi.com/selection/. The current study is part of an ongoing analysis within ISI of the overall performance of OA journals as they are added to the mix of scholarly publications used in the research community. Using ISI citation metrics, we will try to determine if OA journals perform differently from other journals in their respective fields. We welcome comments on this study and look forward to a continuing dialog on this subject. ISI currently covers nearly 200 OA journals in its products (See Appendix I for a list of titles).1 This number, though small in comparison to the total number of journals in ISI’s databases, is quite significant in terms of the progress made by the OA movement. These journals span many subject areas in the natural sciences, the social sciences, and the arts & humanities. For the purposes of this study, we defined “Open Access” simply as not charging readers or their institutions for the right to access, download, copy, print, distribute or search the articles. All of these journals are electronically available, peerreviewed publications. We have not included journals for which only part of the content is freely available—when the archive is openly accessible but the most recent issues are not, for example. We have found that the number of OA journals identified as Open Access and covered in ISI databases is growing rapidly, partly because new journals are founded and older journals are changing their access models, but also because better lists of such journals are becoming available. Each of the OA journals covered by ISI was subjected to the same rigorous selection process as any other journal included. These journals all adhere to high publishing standards, are peer reviewed comparably to other journals in their 1
The list of Open Access journals presented in this study was developed from the following resources: the Directory of Open Access Journals (http://www.doaj.org/) at Lund University; the free full-text journals on the Japan Science and Technology Information Aggregator, Electronic (J-STAGE) site at Meiji University Library (http://www.lib.meiji.ac.jp/olj/list/12000.html); and the Scientific Electronic Library Online (SciELO) project created by the FAPESP, BIREME and CNPq agencies in Brazil (http://www.scielo.br/). The lists from each of these sites were combined, de-duplicated, and compared to Thomson-ISI current coverage. OA journals may exist that are not listed on these resources. Copyright © 2004 The Thomson Corporation
respective fields, and are cited at a level that indicates they compete favorably with similar journals in their field. The chief difference between these and some other journals covered by ISI is that the entire content of the OA journals is available without cost to the user. OVERALL CITATION IMPACT Does the potential for wide distribution of OA journals, at no charge to the reader, have a measurable effect on the citation impact? To answer this question, we looked specifically at a group of 148 journals in the natural sciences that have been covered long enough to have Impact Factors (IF) in the 2002 Journal Citation Reports® (JCR). We focused on the natural sciences because only a small number of OA journals in the social sciences have received Impact Factors. Arts and humanities journals do not have citation metrics in the Journal Citation Reports®. Citation and publication patterns differ between disciplines, so the Impact Factor is only meaningful when it is used to compare journals within a discipline. For this reason, our comparisons in this study are based on the journal’s rank in its respective JCR® category. To normalize the data across all categories, we translated the individual category rankings into percentile rankings. The rank of each OA journal in its category or categories in the 2002 Journal Citation Reports was determined; this rank was divided by the total number of journals ranked in the category to create a percentile rank. The journals ranking highest by Impact Factor are thus in the highest percentiles. For example, the British Medical Journal has a 2002 Impact Factor of 7.585, ranking sixth of 107 journals in the JCR category ‘Medicine, General and Internal.’ Therefore, it is in the 94th percentile of the category. BMC Public Health has a 2002 Impact Factor of 0.294, ranking 87th of 90 in the JCR category ‘Public, Environmental & Occupational Health.’ Therefore, it is in the third percentile of the category. See Appendix I for a complete listing of all OA journals with 2002 Impact Factors and percentile rank. For journals with more than one JCR category, the highest percentile rank was used for analysis. Figure 1 shows the distribution of the percentile rank for the 148 OA journals in the 2002 JCR.
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Distribution of Percentile rank- All OA journals with IF
Number of journals
30 25 20 15 10 5
010
11 -2 0
21 -3 0
31 -4 0
41 -5 0
51 -6 0
61 -7 0
71 -8 0
81 -9 0
91 -1 00
0
Percentile rank
Figure 1: Distribution of percentile rank. 148 Journals. Mean rank =39.77%ile. Open Access journals’ ranks in their respective categories vary. Some rank near the top of the category (e.g., Journal of Machine Learning Research, CA A Cancer Journals for Clinicians, and IBM Journal of Research and Development), while others rank near the bottom (e.g., Journal of Astrophysics & Astronomy, Annals of Saudi Medicine, Japanese Heart Journal, BMC Public Health, Japanese Journal of Infectious Diseases, Scottish Medical Journal, Turkish Journal of Pediatrics, Biotechnology and Development Monitor, and Brazilian Journal of Microbiology). Overall, 98 (66%) of the journals rank below the 50th percentile. Relatively few, around 6%, are in or above the 91st percentile. The journals are distributed across dozens of JCR® subject categories, ranging from ‘Cell Biology’ to ‘Mathematics.’ For the purposes of this study, we grouped JCR categories into one of four broad areas: Medical, Life Sciences, Mathematics & Engineering, and Physics & Chemistry. Figures 2, 3, 4 and 5 show the distribution of the OA journals in these four groupings.
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Medical Journals
Number of Journals
12 10 8 6 4 2
21 -3 0
11 -2 0
010
21 -3 0
11 -2 0
010
31 -4 0
41 -5 0
51 -6 0
61 -7 0
71 -8 0
81 -9 0
91 -1 00
0
Percentile Rank
Figure 2. Medical Journals. 58 Journals. Mean rank= 40.26%ile.
Life Sciences Journals
Number of Journals
9 8 7 6 5 4 3 2 1
31 -4 0
41 -5 0
51 -6 0
61 -7 0
71 -8 0
81 -9 0
91 -1 00
0
Percentile Rank
Figure 3. Life Sciences Journals. 37 Journals. Mean rank = 38.77%ile.
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Engineering & Math Journals 5
Math Engineering
Number of Journals
4 3 2 1
10 0-
-2 0 11
-3 0 21
31
-4 0
-5 0 41
-6 0 51
61
-7 0
-8 0 71
-9 0 81
91
-1 0
0
0
Percentile Rank
Figure 4. Engineering & Mathematics. 24 Journals 18 Engineering Journals. 6 Math Journals. Mean rank = 32.89%ile.
Physics & Chemistry Journals
Number of Journals
8 7 6 5 4 3 2 1
010
11 -2 0
21 -3 0
31 -4 0
41 -5 0
51 -6 0
61 -7 0
71 -8 0
81 -9 0
91 -1 00
0
Percentile Rank
Figure 5. Physics & Chemistry Journals. 29 Journals. Mean rank= 37.10%ile. All subject areas display a wide range of percentile rankings. The Engineering & Mathematics subject area stands out with the highest percentage (26%) of journals in the highest percentiles. All other areas have relatively few high ranking journals.
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CURRENCY OF CITATIONS Does the fact of open access change the velocity or pattern of citation? Intuitively, we would expect that wider readership available under open access would result in new articles being cited sooner. Using all citations in the year 2002, we examined the relative speed with which recent articles in OA journals were cited, and compared that to the overall citation pattern of traditionally published journals. Although some of the OA journals have been publishing for many years, to accommodate the relatively large number of recently launched OA journals, we considered citations only to the past four years. All journals in the following graphs were publishing issues between 1999 and 2002. The graph in Figure 6 shows how citations in 2002 are distributed as a percentage of total cites across the four years under examination. Cited Journals - All Categories 0.4
% of 4 year citations
0.35 0.3 0.25 OA Journals
0.2
All JCR journals
0.15 0.1 0.05 0 2002
2001
2000
1999
Cited Year
Figure 6. Distribution of Citations, 148 Journals Citing Year 2002; Cited Years 2002-1999. The curves suggest that the OA journals have a broadly similar citation pattern to other journals, but may have a slight tendency to earlier citations. They have a slightly higher percentage of citations to articles published in 2002 and thus a lower plateau. Table 1 shows the gross citation counts underlying the graph.
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2002 7184 233548
OA Journals All other JCR
2001 23238 1030108
2000 28829 1379716
1999 28041 1332263
4 year sum 87292 3975635
Table 1. Citation Counts, Citing year 2002, 148 Journals. The wide range of subjects spanned by these data could obscure important differences in citation patterns. To accommodate the known differences in the pace of research and publication between fields, we studied two groups of journals more closely. The JCR category ‘Pharmacology & Pharmacy’ contains journals in a rapidly developing field; the ‘Mathematics’ category, by contrast, contains journals in which the time-span of cited articles is much lengthier. The ‘Pharmacology & Pharmacy’ category contains eight OA journals (AAPS PharmSci, Biological & Pharmaceutical Bulletin, Chemical & Pharmaceutical Bulletin, Journal of Pharmacy & Pharmaceutical Sciences, Journal of Pharmacological Sciences, Japanese Journal of Pharmacology, Polish Journal of Pharmacology, and Yakugaku Zasshi-Journal of the Pharmaceutical Society of Japan). These journals range in age from the recently launched Journal of Pharmacological Sciences, to the Japanese Journal of Pharmacology, published continuously since 1951. We compared the age of cited articles in seven of the eight OA journals in this category to the overall citation pattern of the 188 journals in the ‘Pharmacology & Pharmacy’ category. (The Journal of Pharmacological Sciences did not have citation data in the 2002 JCR and was not included in these analyses.)The graph in Figure 7 shows how citations in 2002 are distributed, as a percentage of total cites, across articles published during the four years under examination. Cited journals - Pharmacology Percentage of 4 years citations
40% 35% 30% All Pharmacology Journals
25% 20%
OA Journals
15% 10% 5% 0% 2002
2001
2000
1999
Cited year
Figure 7. Distribution of Citations, seven Pharmacology and Pharmacy Journals. Citing Year 2002; Cited Years 2002-1999. Table 2 details the distribution of 2002 citations across the four year period for each ‘Pharmacology and Pharmacy’ journal. Copyright © 2004 The Thomson Corporation
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Journal AAPS PHARMSCI BIOL PHARM BULL CHEM PHARM BULL J PHARM PHARM SCI JPN J PHARMACOL POL J PHARMACOL YAKUGAKU ZASSHI All Pharmacology Journals OA Journals
2002 3 58 89 3 31 7 4
2001 64 279 350 17 200 39 26
2000 55 383 496 33 250 69 72
1999 24 319 412 15 252 63 21
4 year sum 146 1039 1347 68 733 178 123
7,711 195
39,153 975
58,189 1358
54,763 1106
159,816 3634
Table 2. Citation Counts, Citing year 2002, seven Journals This limited analysis suggests that, despite their wide distribution and free access, and even in a rapidly evolving subject like pharmacology, the articles in the OA journals are not cited appreciably more quickly than those in comparable, traditional journals. For both OA and traditional publishing model journals, pharmacology journals show a rapid increase in citations for three years post-publication. The OA journals in the ‘Mathematics’ category in the 2002 JCR, despite their higher average rank in category, are similar to other journals in the velocity of their citations . The graph in Figure 8 demonstrates that the six OA math journals (Annales Academiae Scientiarum Fennicae-Mathematica, Annals of Mathematics, Bulletin of the American Mathematical Society, Journal of Lie Theory, Pacific Journal of Mathematics, and Taiwanese Journal of Mathematics) do not differ significantly from other journals in that subject. ‘Mathematics,’ in contrast to ‘Pharmacology & Pharmacy,’ shows a slower time-course for the development of citations. This is because journals in the ‘Mathematics’ category generally cite a far older population of articles.
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Cited journals - Mathematics 45% % of 4 year citations
40% 35% 30% 25%
All Math Journals
20%
OA Journals
15% 10% 5% 0% 2002
2001
2000
1999
Cited year
Figure 8. Distribution of Citations, six Mathematics Journals Citing Year 2002; Cited Years 2002-1999. Table 3 details the distribution of 2002 citations across the four year period for each journal in the ‘Mathematics’ category.
ANN ACAD SCI FENN-M ANN MATH B AM MATH SOC J LIE THEORY PAC J MATH TAIWAN J MATH All Math Journals OA Journals
2002 0 27 7 2 9 3 2,026 48
2001 12 64 13 7 42 5 9,250 143
2000 7 117 18 20 72 27 14,870 261
1999 11 142 69 9 68 23 16,050 322
4 year sum 30 350 107 38 191 58 42,196 774
Table 3. Citation Counts, Citing year 2002, six Journals When examined within two specific subjects, the possibility for wide distribution of OA journal articles has, so far, no discernable effect on the speed with which the literature incorporates the results they describe. As with traditional journals, there are many possible explanations for whether or not OA journals are highly cited. Many of the OA titles that have been indexed in ISI products for many years have only recently shifted to an Open Access model of distribution. They have carried their citation patterns along into the Open Access environment. A good example is the British Medical Journal. Conversely, other journals founded recently employing the Open Access format are being cited or not based on the overall quality of their articles. PLOS Biology, which is too new Copyright © 2004 The Thomson Corporation
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to be analyzed here, appears to be garnering citations at a relatively rapid rate based on the quality of its content. To date (April 5, 2004) articles in its first four issues have already been cited nearly 50 times. The role of regional journals in Open Access publishing is also notable. There are several instances of a significant block of regional journals being made available under dedicated open access environments (e.g., J-STAGE in Japan and SciELO in Brazil). The journals of the SciELO project, for example, are among the most venerable OA journals, having been freely available online since 1999. Yet, in spite of the many notable achievements of Brazilian science, and the success of some of these journals in achieving a level of recognition, many have yet to make a significant citation impact on the international scientific literature. In ISI’s Editorial Development Department, we have witnessed the evaluation, and selection or rejection of thousands of journals. In many cases we have been deluged with eloquent letters from sincere supporters of a particular journal under evaluation. We are often told of an extremely wide and growing base of subscribers to a particular journal. What we find, though, is that wide distribution does not necessarily result in higher citations. Open Access journals certainly have the potential to garner an even greater readership. Except where technology does not permit, anyone in the world will have access to them. Yet how does this additional exposure affect the importance and influence of the journal, as measured by citations? To date, no clear effect has been observed. Though there is some suggestion in aggregate of a slightly more rapid accumulation of citations, this effect is, so far, minimal. The wide distribution of these OA journals has not yet been shown to have any appreciable effect on their appearance in lists of cited references in other journals. ISI will continue to monitor the performance of the set of high-quality OA journals it has selected for inclusion in its citation indexes and in the Journal Citation Reports. It is quite possible that new trends will emerge as early as June of this year, when a new annual analysis of journal data is complete. We will update this document at that time with further analysis. _____________________________________________ This essay was prepared by: James Testa, Director, Editorial Development, Thomson-ISI and Marie E. McVeigh, Product Development Manager, Thomson-ISI.
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Appendix I: Full list of Open Access Journals Physics & Chemistry Title Acta Chimica Slovenica Acta Chromatographica Acta Physica Polonica B Analytical Sciences Arkivoc
IF 0.538 N/A 0.601 0.844 N/A
rank 75
Atmospheric Chemistry and Physics Brazilian Journal of Chemical Engineering Brazilian Journal of Physics Bulletin of the Chemical Society of Japan Bulletin of the Korean Chemical Society Bunseki Kagaku Chemicke Listy Chemistry Letters Chinese Journal of Chemistry Chinese Journal of Physics Croatica Chemica Acta Current Science Ecletica Quimica International Journal of Molecular Sciences Journal of Astrophysics and Astronomy Journal of Chemical Engineering of Japan Journal of the Brazilian Chemical Society
0.714 0.160 0.678 1.213 0.495 0.485 0.336 1.529 0.558 0.518 0.722 0.533 0.194 N/A 0.277 0.459 1.036
31 104 40 36 82 63 92 29 73 44 62 20 107
Journal of the Meteorological Society of Japan Journal of the Serbian Chemical Society Molecules New Journal of Physics Nippon Kagaku Kaishi Nonlinear Processes in Geophysics Oceanologia
0.697 0.361 0.408 1.768 0.188 0.797 N/A
33 89 45 14 109 29
Physical Review Special Topics-Accelerators and Beams Pramana-Journal of Physics Progress of Theoretical Physics Quimica Nova Water SA
N/A 0.324 2.013 0.637 0.481
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43 49
41 71 42
56 12 69 32
11
total in cat 119 68 68 68 53
%ile 36.97% 36.76% 27.94%
46 120 68 119 119 68 119 119 119 68 119 48 119 119 43 120 119
32.61% 13.33% 41.18% 69.75% 31.09% 7.35% 22.69% 75.63% 38.66% 35.29% 47.90% 58.33% 10.08%
46 119 53 68 119 51 41
28.26% 25.21% 15.09% 79.41% 8.40% 43.14%
19 68 68 119 52
4.65% 40.83% 64.71%
17.65% 82.35% 42.02% 38.46%
Category Name Chemistry, Multidisciplinary Chemistry, Analytical Physics, Multidisciplinary Chemistry, Analytical Chemistry, Organic Meteorology & Atmospheric Science Engineering, Chemical Physics, Multidisciplinary Chemistry, Multidisciplinary Chemistry, Multidisciplinary Chemistry, Analytical Chemistry, Multidisciplinary Chemistry, Multidisciplinary Chemistry, Multidisciplinary Physics, Multidisciplinary Chemistry, Multidisciplinary Multidisciplinary Sciences Chemistry, Multidisciplinary Chemistry, Multidisciplinary Astronomy & Astrophysics Engineering, Chemical Chemistry, Multidisciplinary Meteorology & Atmospheric Science Chemistry, Multidisciplinary Chemistry, Organic Physics, Multidisciplinary Chemistry, Multidisciplinary Geochemistry & Geophysics Oceanography Physics, Particles & Fields Physics, Multidisciplinary Physics, Multidisciplinary Chemistry, Multidisciplinary Water Resources
Medicine
AAPS PharmSci
IF 1.700
rank 81
total in cat 187
%ile 56.68%
Acta Medica Okayama
0.506
67
74
9.46%
Annals of Saudi Medicine Arquivos de Neuro-Psiquiatria Asian Journal of Andrology Biological & Pharmaceutical Bulletin BMC Cancer
0.117 0.257 0.827 1.038 1.050
105 79 3 125 91
107 88 5 187 113
1.87% 10.23% 40.00% 33.16% 19.47%
Title
BMC Gastroenterology
N/A
BMC Health Services Research BMC Infectious Diseases BMC Musculoskeletal Disorders
0.083 0.958 N/A
52 34
53 38 22
1.89% 10.53%
0.294 0.802
87 35
90 63
3.33% 44.44%
7.585 32.886
6 1
107 114
94.39% 99.12%
BMC Public Health Brazilian Journal of Medical and Biological Research British Medical Journal CA-A Cancer Journal for Clinicians Canadian Association of Radiologists Journal-Journal de l’Association Canadienne des Radiologistes
45
N/A
Radiology, Nuclear Medicine & Medical Imaging
81
Canadian Journal of Psychiatry-Revue Canadienne de Psychiatrie Canadian Journal of Surgery
1.808 0.448
45 113
88 141
48.86% 19.86%
Canadian Medical Association Journal Chemical & Pharmaceutical Bulletin
3.220 1.133
11 39
107 119
89.72% 67.23%
Circulation Journal
N/A
66
Clinical and Investigative Medicine-Medecine Clinique et Experimentale Cortex
1.029 0.942
52 149
74 197
29.73% 24.37%
Croatian Medical Journal
0.710
57
107
46.73%
N/A 4.757
4
66 38
89.47%
Endocrine Journal Environmental Health Perspectives
0.847 3.452
76 2
88 131
13.64% 98.47%
Experimental and Molecular Medicine
1.267
47
74
36.49%
Family Medicine
1.231
34
107
68.22%
International Journal of Molecular Medicine International Journal of Oncology
2.063 2.931
25 31
74 113
66.22% 72.57%
Israel Medical Association Journal
0.412
76
107
28.97%
0.398 0.306 1.230 14.051
64 37 116 3
66 38 187 74
3.03% 2.63% 37.97% 95.95%
Current Controlled Trials in Cardiovascular Medicine Emerging Infectious Diseases
Japanese Heart Journal Japanese Journal of Infectious Diseases Japanese Journal of Pharmacology Journal of Clinical Investigation
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Category Name Pharmacology & Pharmacy Medicine, Research & Experimental Medicine, General & Internal Psychiatry Andrology Pharmacology & Pharmacy Oncology Gastroenterology & Hepatology Health Care Sciences & Services Infectious Diseases Rheumatology Public, Environmental & Occupational Health Biology Medicine, General & Internal Oncology
Psychiatry Surgery Medicine, General & Internal Chemistry, Multidisciplinary Cardiac & Cardiovascular Systems Medicine, Research & Experimental Neurosciences Medicine, General & Internal Cardiac & Cardiovascular Systems Infectious Diseases Endocrinology & Metabolism Environmental Sciences Medicine, Research & Experimental Medicine, General & Internal Medicine, Research & Experimental Oncology Medicine, General & Internal Cardiac & Cardiovascular Systems Infectious Diseases Pharmacology & Pharmacy Medicine, Research &
Medicine Title
IF
rank
total in cat
%ile
Journal of Health Science
0.754
61
75
18.67%
Journal of Korean Medical Science Journal of Nephrology
0.372 0.971
82 30
107 47
23.36% 36.17%
1.067 N/A 1.515 1.406 2.672
49
45.56%
96 44 26
90 92 187 73 88
48.66% 39.73% 70.45%
0.866
14
26
46.15%
Journal of Occupational Health Journal of Pharmacological Sciences Journal of Pharmacy and Pharmaceutical Sciences Journal of Physiology and Pharmacology Journal of Psychiatry & Neuroscience Journal of Rehabilitation Research and Development Journal of the American Board of Family Practice Journal of Vision
N/A N/A
107 41
Korean Journal of Radiology Malaria Journal
N/A N/A
81 12
Mayo Clinic Proceedings
2.868
14
107
86.92%
Medical Journal of Australia Memorias do Instituto Oswaldo Cruz Molecular Vision
1.673 0.635 2.625
26 8 4
107 12 41
75.70% 33.33% 90.24%
1.035 0.257 N/A 1.171 0.267 0.492 0.984 0.684 N/A
39 178
107 197 113 113 42 60 73 187 32
63.55% 9.64%
Mount Sinai Journal of Medicine Neurology India Oncologist Oncology Reports Orthopedics Physician and Sportsmedicine Physiological Research Polish Journal of Pharmacology Respiratory Research
89 37 46 56 152
21.24% 11.90% 23.33% 23.29% 18.72%
Scottish Medical Journal
0.164
103
107
3.74%
Swiss Medical Weekly
0.770
50
107
53.27%
Texas Heart Institute Journal Turkish Journal of Pediatrics
0.430 0.340
62 65
66 68
6.06% 4.41%
World Journal of Gastroenterology
2.532
13
45
71.11%
Yakugaku Zasshi-Journal of the Pharmaceutical Society Of Japan
0.419
172
187
8.02%
Yonsei Medical journal
0.565
67
107
37.38%
Copyright © 2004 The Thomson Corporation
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Category Name Experimental Toxicology Medicine, General & Internal Urology & Nephrology Public, Environmental & Occupational Health Pharmacology & Pharmacy Pharmacology & Pharmacy Physiology Psychiatry Rehabilitation Medicine, General & Internal Ophthalmology Radiology, Nuclear Medicine & Medical Imaging Tropical Medicine Medicine, General & Internal Medicine, General & Internal Tropical Medicine Ophthalmology Medicine, General & Internal Neurosciences Oncology Oncology Orthopedics Sport Sciences Physiology Pharmacology & Pharmacy Respiratory System Medicine, General & Internal Medicine, General & Internal Cardiac & Cardiovascular Systems Pediatrics Gastroenterology & Hepatology Pharmacology & Pharmacy Medicine, General & Internal
Life Sciences Title
total in cat
IF
rank
Acta Biochimica Polonica Acta Botanica Sinica Acta Histochemica et Cytochemica Acta Neurobiologiae Experimentalis Acta Veterinaria Brno
0.600 0.376 0.456 0.910 0.370
236 107 142 152 79
264 135 151 197 129
10.61% 20.74% 5.96% 22.84% 38.76%
Anais da Academia Brasileira de Ciencias Applied Entomology and Zoology Arquivo Brasileiro de Medicina Veterinaria e Zootecnia Avian Diseases
0.469 0.422 0.116 1.151
22 42 112 25
48 64 129 129
54.17% 34.38% 13.18% 80.62%
Bioscience Biotechnology and Biochemistry
0.992
29
92
68.48%
Biotechnology and Development Monitor
0.063
127
131
3.05%
BMC Bioinformatics
N/A
46
BMC Biotechnology BMC Cell Biology BMC Evolutionary Biology BMC Genetics BMC Genomics BMC Microbiology
N/A N/A N/A N/A N/A N/A
131 151 30 114 114 82
BMC Molecular Biology BMC Neuroscience Brazilian Archives of Biology and Technology Brazilian Journal of Microbiology Breeding Science Cell Research Cell Structure and Function
N/A N/A 0.147 0.134 0.524 1.958 0.872
58 80 29 84 129
264 197 63 82 55 151 151
7.94% 2.44% 47.27% 44.37% 14.57%
Cellular & Molecular Biology Letters
0.651
232
264
12.12%
Electronic Journal of Biotechnology Experimental Animals Fishery Bulletin Florida Entomologist
N/A 0.642 0.934 0.309
55 17 49
131 129 37 64
57.36% 54.05% 23.44%
Genes & Genetic Systems Genetics and Molecular Biology Japanese Journal of Applied Entomology and Zoology Japanese Journal of Physiology
0.978 0.260 0.310 1.117
207 108 48 53
264 114 64 73
21.59% 5.26% 25.00% 27.40%
Journal of Biochemistry and Molecular Biology
0.961
208
264
21.21%
Journal of Bioscience and Bioengineering Journal of Biosciences Journal of Pesticide Science Journal of Radiation Research Journal of Veterinary Medical Science Microbiology and Immunology
0.777 0.606 0.231 1.934 0.496 1.170
38 41 58 15 68 55
92 63 64 63 129 82
58.70% 34.92% 9.38% 76.19% 47.29% 32.93%
Pesquisa Agropecuaria Brasileira
0.133
24
28
14.29%
Copyright © 2004 The Thomson Corporation
14
%ile
Category Name Biochemistry & Molecular Biology Plant Sciences Cell Biology Neurosciences Veterinary Sciences Multidisciplinary Sciences Entomology Veterinary Sciences Veterinary Sciences Food Science & Technology Biotechnology & Applied Microbiology Biochemical Research Methods Biotechnology & Applied Microbiology Cell Biology Evolutionary Biology Genetics & Heredity Genetics & Heredity Microbiology Biochemistry & Molecular Biology Neurosciences Biology Microbiology Agronomy Cell Biology Cell Biology Biochemistry & Molecular Biology Biotechnology & Applied Microbiology Veterinary Sciences Fisheries Entomology Biochemistry & Molecular Biology Genetics & Heredity Entomology Physiology Biochemistry & Molecular Biology Food Science & Technology Biology Entomology Biology Veterinary Sciences Microbiology Agriculture, Multidisciplinary
Life Sciences total in cat 129 63 129 29
Title Pesquisa Veterinaria Brasileira PLOS Biology Productions Animales Revista Brasileira de Ciencia do Solo
IF 0.288 N/A 0.107 N/A
rank 88
Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science
0.389
77
129
40.31%
South African Journal of Animal Science Veterinarni medicina Zoosystema
0.381 0.204 N/A
29 100
42 129 109
30.95% 22.48%
Copyright © 2004 The Thomson Corporation
15
116
%ile 31.78% 10.08%
Category Name Veterinary Sciences Biology Veterinary Sciences Agriculture, Soil Science Veterinary Sciences Agriculture, Dairy & Animal Science Veterinary Sciences Zoology
Engineering & Mathematics Title Annales Academiae Scientiarum Fennicae-Mathematica Annals of Mathematics
IF 0.339 1.905
rank 114 3
Bulletin of Materials Science Bulletin of the American Mathematical Society Electronic Transactions on Numerical Analysis E-polymers ETRI Journal Fibres & Textiles in Eastern Europe
0.340 1.824 N/A N/A 1.214 0.148
128 4
IBM Journal of Research and Development
total in cat 168 168
%ile 32.14% 98.21% 26.01% 97.62%
8 16
173 168 156 74 53 17
3.700
1
46
97.83%
Journal of Artificial Intelligence Research Journal of Lie Theory
0.933 0.435
26 82
74 168
64.86% 51.19%
Journal of Machine Learning Research Journal of Nuclear Science and Technology
3.818 0.572
1 16
74 33
98.65% 51.52%
Category Name Mathematics Mathematics Materials Science, Multidisciplinary Mathematics Mathematics, Applied Polymer Science Telecommunications Materials Sciences, Textiles Computer Science, Hardware & Architecture Computer Science, Artificial Intelligence Mathematics Computer Science, Artificial Intelligence Nuclear Science & Technology
Journal of Research of the National Institute of Standards and Technology Journal of the Society of Rheology Japan
0.766 0.224
10 91
61 102
83.61% 10.78%
Engineering, Multidisciplinary Mechanics
JSME International Journal Series A-Solid Mechanics and Material Engineering
0.277
67
102
34.31%
Engineering, Mechanical
JSME International Journal Series B-Fluids and Thermal Engineering
0.199
78
102
23.53%
Engineering, Mechanical
JSME International Journal Series C-Mechanical Systems Machine Elements and Manufacturing
0.141
89
102
12.75%
Engineering, Mechanical Materials Science, Multidisciplinary Optics Optics Mathematics Polymer Science
84.91% 5.88%
MRS Internet Journal of Nitride Semiconductor Research Optical Review Optics Express Pacific Journal of Mathematics Polymer Journal
1.327 0.538 2.331 0.467 0.881
38 38 8 74 31
173 54 54 168 74
78.03% 29.63% 85.19% 55.95% 58.11%
Sadhana-Academy Proceedings in Engineering Sciences Sensors Taiwanese Journal of Mathematics
0.113 N/A 0.364
53
61 52 168
13.11%
Copyright © 2004 The Thomson Corporation
107
16
36.31%
Engineering, Multidisciplinary Instruments & Instrumentation Mathematics
Arts & Humanities Title American Journal of Archaeology Biblica
IF N/A N/A
rank N/A N/A
Anthropological Science Dados-Revista de Ciencias Sociais Duke Law Journal IMF Staff Papers
IF 0.471 0.217 N/A 0.393
rank 25 43 20 108
Information Research-An International Electronic Journal Irish Journal of Psychological Medicine
N/A N/A
JASSS-The Journal Of Artificial Societies and Social Simulation Minerva Psycoloquy
N/A 0.486 N/A
total in cat N/A N/A
%ile N/A N/A
Category Name Archaeology Religion
%ile 52.83% 23.21% 80.39% 34.94%
Category Name Anthropology Social Sciences, Interdisciplinary Law Economics
Social Sciences Title
Copyright © 2004 The Thomson Corporation
total in cat 53 56 102 166
Information Science & Library Science Psychology, Multidisciplinary
55 102
29
17
56 56 102
48.21%
Social Sciences, Interdisciplinary Social Sciences, Interdisciplinary Psychology, Multidisciplinary
