Informační zdroje v zoologii Stano Pekár
• produced by Institute of Scientific Information
• contains millions of resources from all fields of science
• from 1950 in electronic form
• includes only selected journals
• annually 12 000 000 references are added
• from 16 000 resources (journals, books a proceedings) of
which 8 700 are journals
• most references include abstract, address and list of citations in
other papers
• founded in 1962
• Eugene Garfield with colleagues starts two pojects:
- database of patents in chemistry
- database of published papers in genetics
• Science Citation Index (SCI) - the most complete citation index
of scientific literature (150 areas)
• 150 journals includes 50% of all citations and 2 000 journals
includes 85% of citations
• included are journals with periodicity, in English, reviewed, with
local or international impact
• published since 1975
• provides detailed information on journals including indices
• since 1960 Impact Factor (IF) is calculated
- shows frequency of an average citation of a paper in other
journals
- number of current citations to papers from last 2 years / total
number of papers published during last 2 years
• half-life (HL)
- number of years for a journal, for which there are more than
50% of all citations in the current year
• IF of many journals fluctuates
• journals of small subjects (entomology, mathematics) have low
IF but high HL than large subjects (biotechnology, genetics)
• the highest IF has review journals
• IF indicates which subjects are becoming popular
• comparison of journals’ IF within a subject is recommended
• Highly-Cited: Top 10 of the most cited scientists/teams for
each subject
• Index to Organism Names: currently only animals are
included
• Biology Browser: database of resources
• Science Watch: interviews on current research
1. Find which of 10 references you found previously are included
in the Web of Science.
2. Find Impact factor (IF) and the half-life (HL) of these journals.