NASA Astrophysics Data System -- The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant.
Inspec -- Indexes scientific and technical literature in physics, electrical engineering, electronics, communications, computing, and information technology.
Web of Science (Science Citation Index) -- Search scholarly literature (over the last hundred years) for chemistry, physics, and biology. It also has citation information (how many times an article has been cited), and special features like citation and search alerts, as well as advanced analytics.
OmniFile Fulltext (General Science Abstracts) -- Search scholarly literature for topics in the physical sciences.
Scopus -- Search broadly across scholarly literature in chemistry, physics, and biology. Includes citation information and author profiles.
arXiv -- Cornell University-hosted site provides open access to e-prints in physics, mathematics, and computer science.
Google Scholar -- Searches a wide variety of scholarly information. To access fulltext from off-campus, click "Preferences" and search for NYU in the "Library Links" section. Choose "Get at NYU" (deselect other options), then save preferences.
PubMed/Medline -- Includes medical literature and DNA/protein sequences.