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Effects of shear stress on the microalgae Chaetoceros muelleri

机译:剪应力对微藻Chaetoceros muelleri的影响

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摘要

The effect of shear stress on the viability of Chaetoceros muelleri was studied using a combination of a rheometer and dedicated shearing devices. Different levels of shear stress were applied by varying the shear rates and the medium viscosities. It was possible to quantify the effect of shear stress over a wide range, whilst preserving laminar flow conditions through the use of a thickening agent. The threshold value at which the viability of algae was negatively influenced was between 1 and 1.3 Pa. Beyond the threshold value the viability decreased suddenly to values between 52 and 66%. The effect of shear stress was almost time independent compared to normal microalgae cultivation times. The main shear stress effect was obtained within 1 min, with a secondary effect of up to 8 min.
机译:结合流变仪和专用剪切装置,研究了剪切应力对穆氏拟南芥生存能力的影响。通过改变剪切速率和中等粘度来施加不同水平的剪切应力。通过使用增稠剂,可以在较大范围内量化剪切应力的影响,同时保留层流条件。藻类生存力受到负面影响的阈值在1到1.3 Pa之间。超过阈值,生存力突然下降到52%到66%之间的值。与正常的微藻培养时间相比,剪切应力的影响几乎与时间无关。主要的剪应力效应在1分钟内获得,次要效应长达8分钟。

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