The surface tension of microorganisms is an important parameter in biotechnological processes. In this work contact angles and surface tensions were determined for filamentous micro-organisms Streptomyces levoris and Aspergillus niger. The contact angles were 39.7° and 43.1°, and the surface tensions 59.0 mJ/m2 and 57.3 mJ/m2, respectively. The contact angles for the filamentous broths were measured with the axisymmetric drop shape analysis - contact diameter (ADSA-CD) method which is particularly well suited to rough surfaces. The contact angle results obtained were significantly larger than those earlier reported for bacteria.
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Visiting scientist from Helsinki University of Technology, Espoo, Finland.