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Showing 1 to 10 of 10 for “"pheophytin"”.
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A Model for the Chloroplast: A Study of the Photochemical and Spectral Properties of Pheophytin A Adsorbed to the Surface of Small Particles
… adsorbed to the surface of small particles. Pheophytin was used in these studies because chlorophyll was sometimes degraded by the particle surface. A method was developed to study quantitatively the photosensitized reduction of an azo dye in the highly scattering particle suspensions. …
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The adsorption of bidens pilosa dye molecules onto TiO2 nanoparicle surfaces for optimization of light harvesting efficiency in dye sensitized solor cell: an experimental and theory study
… a broader range of absorbance are known to be pheophytin and porphyrin, which are found in chlorophyll extracted from the B. pilosa plant. FTIR analysis of the prepared TiO2 revealed the absorbed functional groups of the synthesized B. pilosa extracts and confirmed the formation of TiO2 NPs …
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Application of surface-enhanced resonance Raman spectroscopy to chlorophyll and chlorophyll derivatives
… Raman vibrational spectra for chlorophyll a, pheophytin a, and chlorophyll b adsorbed on a roughened silver electrode and excited from within the Soret band to the lowest energy transition in the red at 77K. Cooling to liquid nitrogen temperature was found to improve the spectral quality by …
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Design, synthesis, and characterization of porphyrin derivatives for biological applications
… All three regioisomers were synthesized from pheophytin a, which was extracted from the alga Spirulina pacifica. In vitro investigations using human carcinoma HEp2 cells show that the 15<sup>2</sup>-lysyl regioisomers accumulate the most within cells, and the most phototoxic are the …
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(Bakterio-)Chlorophyll-Modifikationen zur Einlagerung in synthetische Peptide
… sphaeroides. 1.) Darstellung von Fe-(Bakterio-)Pheophytinen: Es wurde ein Verfahren etabliert, das die Metallierung von Pheophytin a, Bakteriopheophytin a und deren Derivate mit Eisen ermöglicht. Zusätzlich wurde diese Methode so weit modifiziert und optimiert, dass ausgehend vom Mohrschen Salz …
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Photochemical Protection of Riboflavin and Tetrapyrroles with Light Scattering Technology
… the degradation rate of the tetrapyrroles pyropheophytin a and pheophytin a (p<0.05). The decrease in rate was not significant for chlorophyll a (p>0.05).
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Changes in respiration rates and biomass attributes of epilithon due to extended exposure to zinc
… midpoint of the studies, the chlorophyll a-to-pheophytin a ratio remained high, indicating that the minimal algal population was not senescing in situ. After 30 days, the epilithon dosed with 1.0 mg Zn liter⁻¹ had higher AFDW, protein, and carbohydrate concentrations than the other treatments. …
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Investigation of photoprotection of photosystem II by cytochrome b559
… to the cytochrome from the reduced form of pheophytin. The results of this dissertation support a model in which the low potential (LP) form of cytochrome b559 protects photosystem II against photoinhibition by deactivating a rarely formed, but unfavorable redox state of photosystem II, …
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Testing The Peninsula Effect: Does It Affect Freshwater Crustaceans Inhabiting Ephemeral Wetlands On Florida's Ridges?
… oxygen, conductivity, chlorophyll á, pheophytin, total nitrogen, total phosphorus, and total hardness. Other habitat variables included surface area, distance to nearest water body, fish presence or absence, hydroperiod, total transmitted light and canopy openness. Crustacean species …
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The Mechanism of Bicarbonate Activation of Plastoquinone Reduction in Photosystem II of Photosynthesis
… directly, and may also impair electron flow from pheophytin (Pheo) to Q$\sb{\rm A}$. These latter effects are more pronounced when HCO$\sb{3}\sp{-}$ is removed and may be due to conformational changes induced by the removal of HCO$\sb{3}\sp{-}$. A model was developed to explain HCO$\sb{3}\sp{-}$ …