Truncation of a stem.  Enzym*  finds enzyme, enzymes, enzymatic, enzymological.....

Double Quotes hold words together in order.  "pinus radiata"  "soil horizon"

Pull-Down Box.  Change where the database looks.  Topic too broad?  Choose Title.

Notice that Zoo. Record, BioAbs, Web of Science, and Medline are all part of a larger sphere called the Web of Knowledge.  You may search all of them at-once by choosing ALL DATABASES in the pull-down at the top of Medline, Bio Abs, or Web of Science.

Go HERE for a further explanation about the differences in these databases from the US National Library of Medicine.

If you want everything and no duplicates, choose "All Databases" from the pulldown at the top of the Web of Science page.

These databases index journals articles....