Abstract
1. 1. The optimal pH of the trehalase from the gut of the house cricket was 4.8–5.2 and the activation energy was 13,500 cal/mol. 2. 2. The 50% inactivation time for trehalase at 50°C was 110 min and the 50% inhibition concentration for mercuric chloride was 455 μM. 3. 3. The caecal tissues were the most important source of gut trehalase but the foregut contents had the highest activity of trehalase. After 5 days of starvation, the total trehalase activity fell by 61%.
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