A comparative study of the amylolytic activity of four strains of Polyporus ostreiformis led to the selection of a good amylase-producing strain. Physiological studies were carried out and under optimal fermentation conditions it produced amylase which yielded residual sugar in an average of 3.0 mg/ml by hydrolysis of starch. Several readily utilizable carbohydrates such as glucose and lactose exerted catabolic repression, inhibiting amylase induction by starch or maltose. Enzyme synthesis was maximum in logarithmic growth phase of the fungus.
Preliminary studies of the production of extracellular enzymes in eight species of aquatic hyphomycetes showed that none of the organisms contained a proteinase activity. Pyrocateehol oxidase activity was restricted toI. hamata andP. constricta. Significant cellulase and α-amylase activity was found inL. curvula. Triacylglycerol lipase activity was maximum inP. constricta.
By using a superluminescent diode as the light source and a depolariser inside the fibre coil, a constant scale factor is achieved without using polarisation control elements. For long-term behaviour an RMS-bias drift of 10 degrees/h is obtained.