Check out these databases if you are looking for scholarly articles.
Below are some databases that will be more relevant/useful for topics related to the "natural sciences" and "mathematics." Be sure to "scroll" down through the box to see additional choices.
Your one true source for authoritatively identifying a chemical substance and its related chemical structures, chemical names, regulatory information, and properties, including CAS Registry Numbers®, reaction schemes, step-by-step experimental procedures, detailed conditions, and product yields.