Electronic Collections Committee
MEDLINE Comparison: WebLUIS vs. PubMed
This study is intended to be a brief and selective comparison of the Medline database in two search interfaces, one in WebLUIS and the other PubMed. PubMed is maintained by the National Center for Biotechnology Information (NCBI), a division of the National Library of Medicine (NLM), and WebLUIS by the Florida Center for Library Automation (FCLA). We know very well that the web-based search interface is evolving all the time, and changes occur almost daily. Because of the time sensitivity factor, I would appreciate readers informing me of any recent changes relevant to this study.
WebLUIS vs. PubMed: Categorized Comparison

Interface: WebLUIS PubMed
Coverage/Update
Coverage Medline 1994 - Medline 1966 - to present, PreMedline—Articles not yet indexed for Medline
Updated Monthly Daily
Cost Yes, subscription to tape fee Free via Web to everyone
Fully integrated access to key molecular biology databases No DNA sequences, Protein sequences, biomolecule 3D structures
Unique Features
Browse a list of journals indexed No Yes
Link to related articles No Yes
Link to full-text No Yes, approx. 100 journals
Indicate library holdings Yes No
Allow ordering articles Online Yes, through Florida SUS Institutions Yes, through Loansome Doc only
Searching Capabilities
Basic & Advanced search Yes Yes
Command language search Yes, one of the three search choices Yes, hidden
Browse MeSH thesaurus No Yes, select MeSH terms to search from thesaurus; still in early development stage
Concurrent multiple field search Yes. Advanced Search & Command search Yes. Basic search & Advanced Search
Support Boolean operators Yes Yes
Support free text search Yes Limited support. Mapping to MeSH is supported
Limit MeSH terms to a main concept Yes, Advanced Search & Command Search Yes, Advanced Search
Volume & Issue fields search Yes, Command Search only Yes
Save search strategy to rerun later No No
View search strategy Yes, need two steps: 1. Click on See Searches to display. 2. Click on Review Search to modify and resubmit the search Yes, automatically display search strategy on top of screen. The search strategy can be edited and resubmitted right there
Display & Managing Results
Display records Display 23 single-line records per page 20 brief bibliographic records per page
Print records Screen print Print list of marked records using browser's print functionality
Save records Save one screen at a time Yes, save list of marked records
E-mail records Yes, mark from each brief record or use Mark in Command Search No
Mark records Yes, mark from each brief record or use mark command Yes, click on a box appeared next to author's name
Download results to file manager software No Yes, Reference Manager & ProCite

PubMed

PubMed has some unique search capabilities not found in other systems at present. For example, it includes the capability of accessing and linking to DNA/Protein sequences and 3D structures, beneficial to molecular biologists; and it includes a PreMedline file that contains very current articles not yet indexed for Medline.

A special feature, Clinical Queries, is designed to help clinicians filtering searches and limiting retrievals to a specific aspect of clinical studies. Currently, four study categories – Therapy, Diagnosis, Etiology, and Prognosis – are provided. Another useful feature, Citation Matcher, is a fill-in-the-blank form to provide end users a quick and easy way to verify incomplete citations.

Displaying results are clear and easy to understand. At top of screen a user's exact location is displayed, for example, Citations 1-20 displayed (out of 112 found), Page 1 of 6. At bottom of screen more instructions on where to go, for example, This is page 1 of 6, Go to page 2 (with a pull-down box listing choices from page 1 through page 6). The retrieved results are consecutively numbered and users know where they are, even when jumping from page to page for marking/de-marking records. A marking record box appears next to an author's name for each record. Users can mark records as they browse; select to save records in text file or html file; and format records for exporting to a file manager (e.g., Reference Manager).

NLM intends to replace MEDLARS's online system for expert searchers with PubMed. Many expert online searchers are working hard to help NLM improve PubMed's search interface, and making suggestions to add many desired features. The new PubMed version 2.0 will soon be implemented. At that time users will see a more powerful search system.

WebLUIS

From years of experience in searching LUIS, we understand that WebLuis is a potentially powerful system. There are many hidden features waiting to be uncovered. The FCLA staff is working hard to upgrade the system and providing excellent supports in all areas to concerned parties. The recommendations from SUS WebLUIS Task Force members are being implemented continuously by FCLA staff. The cooperative efforts among FCLA, WebLUIS Task Force and LUIS users have been the united, powerful force moving to improve WebLUIS system daily. At present the most welcome features not available in PubMed are 1. Holding information of ten state universities, 2.The availability of borrowing online from participating Florida institutions, even from your own library, 3. The ability to Review Search and rerun it across many other databases, 4. The desirable E-Mail functionality and 5.The availability of Command Search as a choice allowing avid LUIS users continue to function well in WebLuis. The obvious advantages of searching many databases using one search interface are saving users' learning time and reducing users' stressful searching experience.

In conclusion, I think it is important to serve diversified groups of users who have different information needs and searching skills, with choices of different search systems. I recommend making both, WebLuis and PubMed, available to our users.

References

PubMed URL: http://www.ncbi.nlm.nih.gov/PubMed/
WebLUIS URL: http://webluis.fcla.edu/cgi-bin/cgiwrap/fclwlv3/wlv3/CM02/DGgen/DBwebluis/P1home

Anagnostelis, B & Cooke, A, Evaluation criteria for different versions of the same database - a comparison of Medline services available via the World Wide Web.
URL: http://omni.ac.uk/

Detmer, WM, Medline on the Web: Ten Questions to Ask When Evaluating a Web Based Service.
URL: http://www.med.virginia.edu/~wmd4n/medline.html

Pi-Yung (Peggy) Hsu, Health Science Center Library, University of Florida, February 9, 1998