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Hydrodynamische Belastbarkeit von Mikroorganismen
Author(s) -
Märkl Herbert,
Bronnenmeier Reinhold,
Wittek Bernd
Publication year - 1987
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.330591204
Subject(s) - aeration , microorganism , viscosity , chemistry , volume (thermodynamics) , methane , flow (mathematics) , chemical engineering , materials science , bacteria , mechanics , composite material , thermodynamics , engineering , biology , organic chemistry , genetics , physics
Hydrodynamic stress resistance of microorganisms . The production of microbial metabolites and the growth of microorganisms are affected by mechanical forces, such as occur on stirring, pumping, and aeration in industrial equipment. This paper considers the methods of investigation and typical experimental results. The sensitivity of the organisms depends upon the stability of the cell wall and upon its morphology. Raising the viscosity of nutrient solution increases the symptoms of damage at a given stirrer speed. In the case of methane‐producing microorganisms, growth and product formation (methane production) are affected in the same manner. Physiological stress, induced for example by the absence of essential nutrients, proves additive to mechanical stress in its effect. It is suggested that the power dissipation per unit volume should be taken as a guide on scale‐up or on transfer of experience gained with one kind of flow system (e. g. jet flow) to another (e. g. stirred tank).