Tannins in utilization of sorghum grains in Burkina Faso.

The study of thirty sorghum varieties used for food in Burkina Faso showed a relationship between tannin level and utilization of sorghum grain. High tannin level varieties (more than 0.2%) are generally used for local alcoholic drink, instead low tannin level varieties (under 0.2%) are used for cooking and for non fermented drinks.

Isolation of apigeninidin from leaf sheaths ofSorghum caudatum.

A stable 3-deoxyanthocyanidin, apigeninidin chloride, a potential fungal growth inhibitor and a useful dye, has been isolated with a high yield (10% in dried material) as the major pigment in the sheaths ofSorghum caudatum.

A cytoplasmic nickel-iron hydrogenase with high specific activity from Desulfovibrio multispirans sp. N., a new species of sulfate reducing bacterium.

A hydrogenase from a new species of sulfate reducing bacterium has been isolated and characterized. In contrast to other hydrogenases isolated from Desulfovibrio, this enzyme is found in the cytoplasmic fraction rather than in the periplasm. The specific activity of the enzyme, as measured in the hydrogen evolution assay, is twice as high as the specific activity of the hydrogenase from D. gigas. It also differentiates itself from the periplasmic Desulfovibrio hydrogenases by being more active in the hydrogen evolution rather than in the hydrogen uptake assay. The enzyme was shown to contain 0.9 atoms of nickel, 11 atoms of iron and 10 atoms of labile sulfide per mole of enzyme. It exhibits an unusually low intensity of the g = 2.31 nickel EPR signal in the isolated enzyme but shows a normal intensity for the g = 2.19 nickel EPR signal when reduced under hydrogen.