Environmental Survey Mold Index

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Indoor mold sensor. Compact mold sensor. Exposed mold sensor.

last updated：Jul 13, 2016

環境生物学研究所

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The mold index is a quantitative representation of the growth environment for mold and is an index used to predict mold contamination.

If the indoor environment is conducive to mold growth, residents only notice the mold contamination when it becomes visible. By the time they realize it, mold spores have already dispersed into the indoor air from the contaminated areas. If it were possible to know in advance whether the environment is suitable for mold growth, measures could be taken before suffering damage from mold. Therefore, we developed a method to use living mold itself as an environmental sensor, quantitatively displaying the environment based on its growth rate, which we named the "fungal index." The author continues to conduct environmental surveys using the fungal index.

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basic information

"Overview of Mold Index Measurement Method" (1) Install the mold sensor in the environmental exposure (set in the investigation environment for a certain period). (2) Recovery. (3) Take microscopic photographs of the sensor fungi inside the mold sensor. (4) Measure the hyphal length. (5) Convert the hyphal length to response units. (6) Response units ÷ number of exposure weeks = Mold Index ● For more details, please contact the Environmental Biology Research Institute. http://kabiken/com/

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Detailed information

Schematic diagram of an indoor mold sensor. Spots of mold spores and nutrients (diameter in millimeters) inoculated on a plastic plate are surrounded by a double-sided tape frame and covered with a film that allows moisture and air to pass through from above. The measurement range for hyphal length is from germination until it reaches the surrounding double-sided tape. During indoor investigations, the test specimen in the diagram is further placed in a bag made of non-woven fabric on one side, sized to a business card.
Examples of growth in the mold sensor: A: No germination is observed. B: Mold spores have germinated and hyphae are elongating. C: Hyphae are significantly elongated, exceeding the measurement limit.