If your library does not have a digital license, you can request a physical copy via interlibrary loan. While you cannot keep the book forever, you can scan the specific chapters you need for your current exam. This is legal under copyright exceptions for education (§ 60a UrhG in Germany).
Search on platforms like eBay Kleinanzeigen, Medimops, or Booklooker. A used 14th or 15th edition of Brock Mikrobiologie costs between €20 and €40. Study with it for six months, then sell it for €20. Your net cost? €20.
A standard "Brock Mikrobiologie" PDF typically contains the following thematic units. The structure follows a "Principles first, Applications later" approach.
Date: October 26, 2023 Subject: Educational Resource Assessment: Brock Biology of Microorganisms (German Edition)