The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Michael W. Fowler - One of the best experts on this subject based on the ideXlab platform.
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Interactions between the unicellular red alga Porphyridium cruentum and associated bacteria
European Journal of Phycology, 1993Co-Authors: M. Iqbal, D. Grey, G. Sepan-sarkissian, Michael W. FowlerAbstract:Interactions between the unicellular red alga Porphyridium cruentum and strains of bacteria living in the capsule of the alga were examined in batch culture. Three strains of bacteria, initially designated as W1, W2 and W3, were isolated from the capsule of P. cruentum. A decrease of 18% in growth and of 20% in polysaccharide production were observed when bacterium W1 alone was grown with the alga. However, these inhibitory effects became less effective when W1 was cultured with one of the other bacteria. No significant differences in growth or polysaccharide production were observed when all three bacteria were mixed with the alga. On the basis of their cumulative effect, the associative interaction may be classified as a form of symbiosis.
Soonyeong Choi - One of the best experts on this subject based on the ideXlab platform.
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effect of culture conditions on production of polysaccharides and growth rate of Porphyridium cruentum
Korean Journal of Fisheries and Aquatic Sciences, 2008Co-Authors: Dongsik Joo, Soonyeong ChoiAbstract:The growth of Porphyridium cruentum and its porphyran polysaccharide production were measured as functions of light intensity, temperature, light quality (fluorescent, blue, red, and green) and nitrate concentration. The optimum light intensity, temperature, and nitrate concentration for the growth of Porphyridium cruentum and for its polysaccharide production were 1,400 lx, , and 0.03%, respectively. The maximum cell concentration and polysaccharide content under the optimum conditions were 1.95 and 0.23 mg/mL, respectively. Light quality did not influence growth or polysaccharide production. The best results for growth and polysaccharide production were obtained using fluorescent light.
M.b. Veryasov - One of the best experts on this subject based on the ideXlab platform.
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Two γ-polypeptides of B-phycoerythrin from Porphyridium cruentum
Journal of Photochemistry and Photobiology B-biology, 1997Co-Authors: Igor N. Stadnichuk, L.d. Kislov, V.e. Semenenko, Navassard V. Karapetyan, M.b. VeryasovAbstract:Abstract B-Phycoerythrin, the major phycobiliprotein of Bangiophyceae red algae, is composed of chromophorylated α-, β- and γ-polypeptide chains. Two γ-subunits with distinct molecular masses were chromatographically separated from B-phycoerythrin of the red alga Porphyridium cruentum . Both γ-polypeptides were spectrophotometrically identified as having the same composition of five chromophoric prosthetic groups: three phycourobilins and two phycoerythrobilins.
M. Iqbal - One of the best experts on this subject based on the ideXlab platform.
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Interactions between the unicellular red alga Porphyridium cruentum and associated bacteria
European Journal of Phycology, 1993Co-Authors: M. Iqbal, D. Grey, G. Sepan-sarkissian, Michael W. FowlerAbstract:Interactions between the unicellular red alga Porphyridium cruentum and strains of bacteria living in the capsule of the alga were examined in batch culture. Three strains of bacteria, initially designated as W1, W2 and W3, were isolated from the capsule of P. cruentum. A decrease of 18% in growth and of 20% in polysaccharide production were observed when bacterium W1 alone was grown with the alga. However, these inhibitory effects became less effective when W1 was cultured with one of the other bacteria. No significant differences in growth or polysaccharide production were observed when all three bacteria were mixed with the alga. On the basis of their cumulative effect, the associative interaction may be classified as a form of symbiosis.
W Reuter - One of the best experts on this subject based on the ideXlab platform.
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Core substructure of the hemiellipsoidal phycobilisome from the red alga Porphyridium cruentum.
European journal of cell biology, 1993Co-Authors: D Redecker, W Wehrmeyer, W ReuterAbstract:The allophycocyanin core of hemiellipsoidal phycobilisomes from the red alga, Porphyridium cruentum, was isolated by chromatography on hydroxylapatite and subsequent density gradient centrifugation. Electron microscopy of negatively stained core complexes revealed a tricylindrical structure with a width of 21 to 23 nm in face view and a depth of 12 to 14 nm in side view. Fluorescence emission spectra of these complexes were similar to those of whole phycobilisomes confirming the presence of the two "terminal energy acceptors" allophycocyanin B (APB) and the high molecular linker polypeptide LCM. The polypeptide composition analyzed by SDS-PAGE showed the "anchor" polypeptide LCM, alpha AP, alpha APB, beta AP subunits, a low molecular weight linker with M(r) 13,500 and a blue-colored polypeptide of M(r) 19,800. A complex containing APB could be isolated from a "trimeric" allophycocyanin fraction of the density gradient by agarose gel electrophoresis in the presence of ampholytes. This complex shows a polypeptide composition of (alpha APB alpha AP2 beta AP3).L13.5C and contributes to the core with 30 to 35% of total "trimers". In comparison to the allophycocyanin cores from hemidiscoidal phycobilisomes of cyanobacteria and red algae, all data concerning the core of the hemiellipsoidal phycobilisomes from Porphyridium cruentum strongly suggest that there is no increase in size but an increase in its APB content. A model comprising the allophycocyanin core and the membrane integral photosystem II particles presents the structural and possible functional consequences of the results.