Results 211 to 220 of about 111,032 (263)
Selective Stabilization of PSI-Associated Electron Transport Network Underlies Cytokinin-Mediated Delay of Leaf Senescence in Barley. [PDF]
Int J Mol SciSkowron E, Trojak M, Szymkiewicz J.
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Journal of Molecular Structure: THEOCHEM, 2005
Semiempirical MNDO-d molecular orbital calculations have been used for the structural study of chlorophyll b and anhydrous chlorophyll b dimer systems in their respective ground states. A model of chlorophyll b dimer has been considered whereby the magnesium atom is five-coordinate with an oxygen atom in the fifth coordination site. Total energies, net
M. Nsangou +4 more
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Semiempirical MNDO-d molecular orbital calculations have been used for the structural study of chlorophyll b and anhydrous chlorophyll b dimer systems in their respective ground states. A model of chlorophyll b dimer has been considered whereby the magnesium atom is five-coordinate with an oxygen atom in the fifth coordination site. Total energies, net
M. Nsangou +4 more
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Aggregation of chlorophyll b in model systems
Journal of Photochemistry and Photobiology A: Chemistry, 1996Abstract Chlorophyll b (Chl b ) in model systems occures in several forms. The relationship between these forms and the forms occurring in organisms is not yet clear. Chl b aggregation has been investigated less than that of Chl a . In this paper, several spectral features, e.g. fluorescence lifetimes in the picosecond time range, time-resolved
D. Fra̧ckowiak +5 more
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Simultaneous determination of chlorophyll a and chlorophyll b by derivative spectrophotometry
Analytical and Bioanalytical Chemistry, 2004Chlorophyll a (Chl a) and chlorophyll b (Chl b) plant pigments, which are important in the food industry and are beneficial as environmental pollution indicators, have been extracted with a novel solvent mixture (1:1 v/v acetone-propanol) not containing chloroform and simultaneously determined by first-derivative spectrophotometry.
Ergun, Emel +3 more
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Conversion of Chlorophyll b to Chlorophyll a by Isolated Cucumber Etioplasts
Archives of Biochemistry and Biophysics, 1993Chlorophyllide b was converted to chlorophyll a when incubated with cucumber etioplasts in the presence of phytol, ATP, and MgCl2. Chlorophyll a was identified by retention time on HPLC, absorption, fluorescence, and excitation spectra. It is suggested that the interconversion of chlorophyll a and b plays a significant role in the establishment of the ...
H, Ito, Y, Tanaka, H, Tsuji, A, Tanaka
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Origin of the chlorophyll b formyl oxygen in Chlorella vulgaris
Biochemistry, 1992Chlorophyll (Chl) b is an accessory light-harvesting pigment of plants and chlorophyte algae. Chl b differs from Chl a in that the 3-methyl group on ring B of chl a is replaced by a 3-formyl group on Chl b. The present study determined the biosynthetic origin of the Chl b formyl oxygen in in vivo labeling experiments. A mutant strain of the unicellular
M A, Schneegurt, S I, Beale
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Biosynthesis of chlorophyll b and the chlorophyll cycle
Photosynthesis Research, 2002Recent progress in the knowledge of chlorophyll b biosynthesis from chlorophyllide a and reduction of chlorophyll b to chlorophyll a is described. The minireview includes a description of the enzymes involved in these reactions and, where appropriate, of the genes encoding these enzymes.
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1998
Investigations of biochemical reactions involved in the formation of chlorophyll b pigment are still in progress (Rudiger, 1997). An interesting new approach is the study of suppression of the cbnl-gene mutation which leads to chlorophyll b absence in the green alga Chlamydomonas reinhardtii (Chunaev et al., 1991).
Karina Nikoulina +4 more
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Investigations of biochemical reactions involved in the formation of chlorophyll b pigment are still in progress (Rudiger, 1997). An interesting new approach is the study of suppression of the cbnl-gene mutation which leads to chlorophyll b absence in the green alga Chlamydomonas reinhardtii (Chunaev et al., 1991).
Karina Nikoulina +4 more
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A naturally occurring, chlorophyll b related porphyrin
Tetrahedron Letters, 1984Abstract A C 31 alkyl porphyrin, occurring in an oil shale as the V=O complex, has been isolated as the free base acetylated derivative whose structure has been determined by 1 H NMR spectroscopy; the parent compound provides the first circumstantial evidence for a link between sedimentary porphyprins and chlorophyll b.
M.I. Chicarelli, J.R. Maxwell
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