Primary Literature (Articles) contain research, a study, or an experiment. This is often reflected in the general outline of the article, which contains these important aspects:
If you are ever unsure of what type of article you are reading, read the abstract (summary) of the article for a better understanding of what it contains. If it is a primary article, the authors will outline the steps they took engaging in the research and give a brief overview of the results
PubMed comprises more than 27 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Embase is a international biomedical and pharmacological database containing bibliographic records with citations, abstracts and indexing derived from biomedical articles in peer reviewed journals, and is especially strong in its coverage of drug and pharmaceutical research.