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Measurement of airborne algal mortality rates due to heat shock treatment

机译：测量由于热休克治疗而导致的空气藻类死亡率

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Green and/or black soiling on building facades worldwide is caused by airborne algae, which has strong drought tolerance and grows in the atmosphere. Poikilohydric plants such as algae and lichens have high heat resistance under dry conditions and high thermo-sensitivity under wet conditions. However, there have been no studies of heat shock treatments against airborne algae adhering to surfaces. This study investigated the relationship between heat shock conditions (treatment temperature and duration and the water content of algae) and algal mortality. Algae collected from the exterior wall of a building were heat-treated in a laboratory, and their chlorophyll fluorescence intensity was measured. The following results were obtained: (a) higher treatment temperature and longer treatment time increased the rate of algal death, (b) the survival rate of heat-treated dry algae was higher than that of wet algae and recovered after the treatment, and (c) the effects of continuous and intermittent heat shock were similar, and algal mortality increased with the total treatment time. It was concluded that the airborne algae died after heat shock treatment at 35 degrees C for 24 h and at 40 degrees C after 6 h under wet conditions. Algae from an exterior concrete wall were heat-treated in a wet condition, and algal death was confirmed by the decrease in surface L* values and a color change from green to yellow.
机译：全球建筑物外观上的绿色和/或黑色污染是由空中藻类引起的，这在大气中具有强大的耐旱性并生长。藻类和地衣如藻类植物，在干燥条件下具有高耐热性，并且在潮湿条件下具有高热敏感性。然而，没有关于粘附在表面的空气藻类的热休克治疗。本研究调查了热休克条件（治疗温度和藻类水含量）与藻类死亡率之间的关系。从建筑物的外壁收集的藻类在实验室中进行热处理，并测量它们的叶绿素荧光强度。获得以下结果：（a）治疗温度较高，治疗时间较高增加藻类死亡率，（b）热处理干藻的存活率高于湿藻类，治疗后恢复，并（ c）连续和间歇热冲击的影响相似，藻类死亡率随着总处理时间而增加。得出结论是，在潮湿条件下在6小时后，在35℃下，在35℃下热休克治疗后，在35℃下进行24小时，在40℃下死亡。来自外部混凝土壁的藻类在潮湿的情况下进行热处理，通过表面L *值的降低确认藻类死亡，并从绿色变为黄色。

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