Flavocytochrome c of Chromatium vinosum. Some enzymatic properties and subunit structure.

The function and the structural features of Chromatium vinosum cytochrome c-552 have been investigated. Cytochrome c-552 has a sulfide-cytochrome c reductase activity and also catalyzes the reduction of elementary sulfur to sulfide with reduced benzylviologen as the electron donor. In the sulfide-cytochrome reduction, horse and yeast cytochromes c act as good electron acceptors, but cytochrome c' or cytochrome c-553(550) purified from the organism does not.

Curved triple-mirror screen for projection-type three-dimensional display.

A screen consisting of a number of tiny triple mirrors (cubic corners) is an autocollimating screen which reflects back the incident ray of light always into the original direction. Such a screen can be used in a projection-type three-dimensional display. Proposed in this paper is a curved triple-mirror screen which is composed of many tiny triple mirrors having one cylindrical and two flat reflecting surfaces.