title: When Anton van Leeuwenhoek looked through his early microscopes in the 1600s, he realized that the world was teeming with microbial organisms. Introduction.
authors.forename: Rachel K
authors.initials: RK
authors.lastname: Zwick
authors.forename: Barbara A
authors.initials: BA
authors.lastname: Schmidt
mesh_terms: D003952:Diagnostic Imaging / Q000266:history* / Q000295:instrumentation; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D008829:Microbiology / Q000266:history; D008853:Microscopy / Q000266:history*; D009426:Netherlands