Results 151 to 160 of about 13,329,450 (200)
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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.
W Rüdiger
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Simultaneous determination of chlorophyll a and chlorophyll b by derivative spectrophotometry
Analytical and Bioanalytical Chemistry, 2004 Chlorophyll 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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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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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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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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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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On the role of chlorophyll b in ontogenetic adaptations of plants
Biology Bulletin Reviews, 2014Plants of the barley mutant chlorina3613, which completely lacks chlorophyll b, were investigated over their full life cycle growing in the field under natural light conditions. At various stages of the life cycle, plants were shaded for one week, and the effects of the shading on the further growth were monitored after restoration of the natural light
E. V. Tyutereva +2 more
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Electronic structure of the enolate anion of chlorophyll b
Tetrahedron Letters, 2005Abstract The enolate anion of chlorophyll b (Chl b) has been synthesized under deoxygenated conditions and its electronic structure characterized for the first time by 1H NMR and electronic absorption spectroscopy. The formation of the enolate anion caused a marked perturbation to the 18 π-electron [18]diazaannulene aromatic pathway of Chl b.
Paavo H. Hynninen +2 more
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