Results 261 to 270 of about 23,523 (302)
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AJN, American Journal of Nursing, 1955
keeps things outdoors a beautiful green, is one of the most unravelled mysteries of the organic world. We are just scratching the surface of a partial understanding of its properties and the values it may hold when it is used properly. Chlorophyll is the catalyst that converts moisture, carbon dioxide, and the sun's energy-by some means-into the ...
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keeps things outdoors a beautiful green, is one of the most unravelled mysteries of the organic world. We are just scratching the surface of a partial understanding of its properties and the values it may hold when it is used properly. Chlorophyll is the catalyst that converts moisture, carbon dioxide, and the sun's energy-by some means-into the ...
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The aggregation of chlorophyll a
Archives of Biochemistry and Biophysics, 1964Abstract 1. 1. Aggregation of chlorophyll a in various nonpolar solvents has been demonstrated, and from the IR spectra the probable site of the hooking together of the molecules has been deduced. 2. 2. If chlorophyll a exists in the cell in a completely nonpolar milieu (as the visible spectroscopic studies suggest), then CCl4 solutions of ...
A F, ANDERSON, M, CALVIN
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Chlorophylls and chlorophyll derivatives
1996Chlorophyll derivatives form a significant and growing element in the range of natural pigments used as food colorants. An account is provided of the methods of production and of the products formed under industrial conditions. Consideration is given to the formation of chlorophyll under biological conditions, together with a comprehensive summary of ...
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Current Opinion in Plant Biology, 2006
Since the 1970s, researchers have proposed several regulatory pathways governing chlorophyll metabolism, but only recently have the underlying molecular mechanisms been elucidated. The recent data indicate that such regulatory systems are more complex than originally anticipated.
Ayumi, Tanaka, Ryouichi, Tanaka
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Since the 1970s, researchers have proposed several regulatory pathways governing chlorophyll metabolism, but only recently have the underlying molecular mechanisms been elucidated. The recent data indicate that such regulatory systems are more complex than originally anticipated.
Ayumi, Tanaka, Ryouichi, Tanaka
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Chemical Physics Letters, 1974
Abstract A molecular orbital calculation, using the “free-electron-network” method, is reported for the absorption spectrum of chlorophyll a and the complexes chlorophyll/ p -dioxane and chlorophyll/ p -benzoquinone. For chlorophyll a , our results are in good agreement with experiment and are substantially the same as those obtained by Weiss ...
Joseph Le Brech +2 more
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Abstract A molecular orbital calculation, using the “free-electron-network” method, is reported for the absorption spectrum of chlorophyll a and the complexes chlorophyll/ p -dioxane and chlorophyll/ p -benzoquinone. For chlorophyll a , our results are in good agreement with experiment and are substantially the same as those obtained by Weiss ...
Joseph Le Brech +2 more
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Energy transfer between Chlorophyll C and Chlorophyll A
Biophysical Chemistry, 1973Abstract Spectral properties of solutions containing mixtures of chlorophyll a and chlorophyll c are investigated. The yield of excitation energy migration from chlorophyll c to chlorophyll a is obtained ranging from 23 to 48% dependent on the used dye concentrations. The back transfer from chlorophyll a to chlorophyll c is negligible.
D, Frackowiak, D, Wróbel
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Chlorophyll synthetase cannot synthesize chlorophyll a′
European Journal of Biochemistry, 1994Chlorophyll synthetase catalyzes the last step of chlorophyll biosynthesis, namely prenylation (esterification) of chlorophyllide with phytyl diphosphate or geranylgeranyl diphosphate. During investigation of various chlorophyllide derivatives as potential substrates we observed lower esterification with increasing percentages of chlorophyllide a′ in ...
M, Helfrich +4 more
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Dipole Strengths in the Chlorophylls¶†
Photochemistry and Photobiology, 2003Measurements of dipole strengths of chlorophylls in solution are reviewed and correlated. The refractive index dependence is found to be expressible in a simple empirical fashion that does not rely on the concept of vacuum dipole strength. The index dependence in some respects contradicts the dependence expected on the basis of effective field theories.
Robert S, Knox, Bryan Q, Spring
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Photosynthesis Research, 1986
Recent advances in the studies on chlorophyll-protein complexes of higher plants are summarized in this article. Special emphasis is laid on the isolation, pigment composition and the absorption and fluorescence properties of the complexes.
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Recent advances in the studies on chlorophyll-protein complexes of higher plants are summarized in this article. Special emphasis is laid on the isolation, pigment composition and the absorption and fluorescence properties of the complexes.
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Crystallization of Chlorophylls
Science, 1958L P, ZILL, G, COLMANO, H J, TRURNIT
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