Web of Science
Identifies articles in science, social science, and arts and humanities, and the articles that cite them. Combination of full text and abstracts. Provides the most current index to over 8000 of the world's leading scholarly research journals in all disciplines. Updated weekly. Available from 1982-present. Includes a unique "cited reference" feature, to find articles that have cited a given article. You can search by category, including "plant sciences" and then limit your search by topic, title, etc. such as "patent." Because this is a large database, it is important to control and focus your search terms in order to obtain the most relevant results.