Showing papers by "Alexander N. Glazer published in 1979"
TL;DR: Electron microscopy showed the three types of phycobilisomes to have a hemi-disc appearance, although their detailed structures were quite different, as well as independent of the detergent used during the preparation.
Abstract: Properties of cyanobacterial phycobilisomes (from Synechococcus spp. 6301 and 6312 and Synechocystis sp. 6701) prepared in the presence of two different zwitterionic detergents were compared to those of phycobilisomes detached from membranes with the nonionic detergent Triton X-100 and then freed from Triton by sedimentation through high-salt sucrose density gradients. The absorption spectra, polypeptide composition, and ultrastructure of phycobilisomes were independent of the detergent used during the preparation. Phycobilisomes from certain cyanobacteria aggregated in the absence of detergent. Such aggregation was not seen in preparations containing zwitterionic detergents. Aggregation of phycobilisomes led to a partial quenching of their fluorescence. Electron microscopy showed the three types of phycobilisomes to have a hemi-disc appearance, although their detailed structures were quite different.
59 citations
01 Jan 1979
TL;DR: It is here suggested that the various pigments involved were originally called into existence in response to certain physical environmental forces or variables and that by far the most important of these external factors was illumination.
Abstract: Everyone who has observed and considered a field of marine algae on the seashore at low tide knows that there are four very conspicuous groups of plants in the ocean. They are the blue-green, red, brown, and green algae. The obvious question is, Why does the sea contain plants of such a variety of colors when the land supports only green vegetation?… It is here suggested that the various pigments involved were originally called into existence in response to certain physical environmental forces or variables and that by far the most important of these external factors was illumination, the quantity or quality of which was determined or modified by two different media, (a) the sea water in which the organisms lived and (b) the layer of atmosphere above it.
28 citations
TL;DR: Hydrolysis of cytochromes c and phycobiliproteins in 6 n HCl containing 0.21 m dimethylsulfoxide at 110°C for 22 h results in the quantitative conversion of cysteinyl, cystinyl, and thioether-linked cyteinyl residues to cysteic acid.
24 citations