NADP-dependent glutamate dehydrogenase was partiafly purified from extacts of the marine siphonous green alga Caulrpa simpliciuscula. The enzyme had an apparent Km NH4+ of 0.4 to 0.7 mm and was highly specific for NADPH, a-ketoglutarate, and ammonium ions.The bulk of the NADP-gutamate dehydrogenase was isolated with the chloroplast fraction in cell-free preparations of this alga and was released from these "chloroplast fractions" as a soluble enzyme on gende lysis of chloroplast membranes.

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Factors which cause variations in the finished size of clay products are determined. These are classified in the order of their importance, and limits are established within which the factors must be controlled to reduce these variations to a point which is consistent with the commercial production of modular products.The factors found to have the greatest effect on the finished size are soaking temperature and soaking time. Those factors having a lesser effect are (1) firing atmosphere, (2) relative amounts of clay mineral and quartz present in the clay in the different parts of the pit, (3) grain size of the clay produced by grinding or weathering, and (4) deairing treatment.