Paper Chase is a research database designed to offer abstracts of research articles published in journals that have a highly rated impact factor as determined by ISI Impact Factor and PageRank. Abstracts are organized by date, with the most recently published papers listed first. 

Paper Chase

Acetylation of Glutamic Acid by Extracts of Escherichia Coli.

Proc. Natl. Acad. Sci. U.S.A.. 10 1, 1953;39(10):1004-8.
Maas WK, Novelli GD, Lipmann F.

Biochemical Research Laboratory, Massachusetts General Hospital, Boston.