Inorganic Pigment
Mostrando 13-16 de 16 artigos, teses e dissertações.
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13. Spirochaeta aurantia, a Pigmented, Facultatively Anaerobic Spirochete
A strain of Spirochaeta aurantia was isolated from mud by a procedure involving migration of the organisms through cellulose ester filter discs (0.3-μm pore diameter) onto the surface of culture plates. The helical cells measured 0.3 by 10 to 20 μm during exponential growth. Electron microscopy showed the presence of two subterminally inserted axial fibril
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14. The PsbY Protein Is Not Essential for Oxygenic Photosynthesis in the Cyanobacterium Synechocystis sp. PCC 68031
A tetra-manganese cluster in the photosystem II (PSII) pigment-protein complex plays a critical role in the photosynthetic oxygen evolution process. PsbY, a small membrane-spanning polypeptide, has recently been suggested to provide a ligand for manganese in PSII (A.E. Gau, H.H. Thole, A. Sokolenko, L. Altschmied, R.G. Herrmann, E.K. Pistorius [1998] Mol Gen
American Society of Plant Physiologists.
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15. Gas Exchange and C Allocation in Dunaliella salina Cells in Response to the N Source and CO2 Concentration Used for Growth.
The halotolerant alga Dunaliella salina was cultured on 10 mM NH4+ or NO3- with air CO2 or 5% (v/v) CO2. Cells grown on NH4+ rather than NO3- were up to 17% larger in volume but had similar division rates. The photosynthetic K0.5 of dissolved inorganic C per cell was reduced, but the light- and CO2-saturated photosynthesis, dark respiration, and light-indepe
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16. Sn-protoporphyrin rapidly and markedly enhances the heme saturation of hepatic tryptophan pyrrolase. Evidence that this synthetic metalloporphyrin increases the functional content of heme in the liver.
Sn-protoporphyrin is a potent competitive inhibitor of heme oxygenase, the rate-limiting enzyme in heme degradation to bile pigment, and has been successfully utilized to suppress hyperbilirubinemia in a variety of experimental and naturally occurring forms of jaundice in animals and man. The compound is presumed to act in vivo primarily by inhibiting heme o