Chemical Abstracts; ISI-Scientific Database, Science Citation Index (SCI), Science Citation Index-Expanded (SCIE), Journal Citation Reports/Science Edition, Chemistry Citation Index (CCI), Materials Science Citation Index (MSCI), Current Contents/Physical Chemical and Earth Sciences (CC/PC&ES), Web of Science, Research Alert; INSPEC Information Services; Cambridge Scientific Abstracts/METADEX-Engineered Materials Abstracts; PASCAL Database; Index Medicus and MEDLINE.