beta-Amylase production by some Bacillus cereus, Bacillus megaterium and Bacillus polymyxa [correction of polymaxa] strains.

The production of extracellular beta-amylase by some Bacillus cereus, Bacillus megaterium and Bacillus polymyxa [corrected] strains was investigated, and the maximal yields of the enzyme were 3.6; 9.3 and 20.

Photosynthesis in detached rye leaves at normal and low oxygen concentration. II. Incorporation of 14CO2 into amino acids.

The pools of Arg, Gly, His, Ile, Ser, Glu, Leu, Val and Asp were lower during photosynthesis at 1% O2 concentration. At the same time specific radioactivity of a number of amino acids--following 14CO2 incorporation--was different than that at atmospheric O2 concentration. This is probably due to the inhibition of the photorespiratory nitrogen cycle and the resulting NH+4 deficiency.

Photosynthesis in detached rye leaves at normal and low oxygen concentration. I. Incorporation of 14CO2 into 2-oxo acids.

In the leaves of rye plants at the milk maturity stage of grains, the following eight 2-oxo acids were detected by catalytic hydrogenolysis of the respective dinitrophenylhydrazone derivatives: 2-oxoglutarate, pyruvate, oxaloacetate, glyoxylate, hydroxypyruvate, 2-oxoisovalerate, 2-oxo-6-aminocaproate and 2-oxo-5-guanidinovalerate. Lowering of O2 concentration decreased incorporation of 14CO2 not only into the intermediates of the glycolate pathway, i.e.