نتایج جستجو برای: light harvesting

تعداد نتایج: 419890  

Journal: :The EMBO journal 1999
C Jungas J L Ranck J L Rigaud P Joliot A Verméglio

Native tubular membranes were purified from the purple non-sulfur bacterium Rhodobacter sphaeroides. These tubular structures contain all the membrane components of the photosynthetic apparatus, in the relative ratio of one cytochrome bc1 complex to two reaction centers, and approximately 24 bacteriochlorophyll molecules per reaction center. Electron micrographs of negative-stained membranes di...

Journal: :Journal of the American Chemical Society 2013
Doran I G Bennett Kapil Amarnath Graham R Fleming

Photosystem II (PSII) initiates photosynthesis in plants through the absorption of light and subsequent conversion of excitation energy to chemical energy via charge separation. The pigment binding proteins associated with PSII assemble in the grana membrane into PSII supercomplexes and surrounding light harvesting complex II trimers. To understand the high efficiency of light harvesting in PSI...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Matthew D Brooks Emily J Sylak-Glassman Graham R Fleming Krishna K Niyogi

The light-harvesting complexes of plants have evolved the ability to switch between efficient light harvesting and quenching forms to optimize photosynthesis in response to the environment. Several distinct mechanisms, collectively termed "nonphotochemical quenching" (NPQ), provide flexibility in this response. Here we report the isolation and characterization of a mutant, suppressor of quenchi...

Journal: :The Plant cell 2006
László Kovács Jakob Damkjaer Sami Kereïche Cristian Ilioaia Alexander V Ruban Egbert J Boekema Stefan Jansson Peter Horton

The photosystem II (PSII) light-harvesting antenna in higher plants contains a number of highly conserved gene products whose function is unknown. Arabidopsis thaliana plants depleted of one of these, the CP24 light-harvesting complex, have been analyzed. CP24-deficient plants showed a decrease in light-limited photosynthetic rate and growth, but the pigment and protein content of the thylakoid...

Journal: :The Journal of biological chemistry 2007
Luca Dall'Osto Alessia Fiore Stefano Cazzaniga Giovanni Giuliano Roberto Bassi

Xanthophylls (oxygenated carotenoids) are essential components of the plant photosynthetic apparatus, where they act in photosystem assembly, light harvesting, and photoprotection. Nevertheless, the specific function of individual xanthophyll species awaits complete elucidation. In this work, we analyze the photosynthetic phenotypes of two newly isolated Arabidopsis mutants in carotenoid biosyn...

2012
Nikodem Czechowski Piotr Nyga Mikołaj K. Schmidt Tatas H. P. Brotosudarmo Hugo Scheer Dawid Piatkowski Sebastian Mackowski

We report on experimental and theoretical studies of plasmon-induced effects in a hybrid nanostructure composed of light-harvesting complexes and metallic nanoparticles in the form of semicontinuous silver film. The results of continuous-wave and time-resolved spectroscopy indicate that absorption of the light-harvesting complexes is strongly enhanced upon coupling with the metallic film spaced...

Journal: :Current Biology 2008
Samuel I. Beale

Phycobilins function as light-harvesting pigments in most cyanobacteria and red algae. Although green cyanobacteria of the genus Prochlorococcus express genes encoding enzymes that direct the synthesis of phycobilins, these pigments do not appear to play a role in light harvesting in Prochlorococcus. Now, it is shown that cyanophages infecting Prochlorococcus also contain genes for phycobilin-s...

Journal: :Nano letters 2015
Shuo Dong Dhara Trivedi Sabyasachi Chakrabortty Takayoshi Kobayashi Yinthai Chan Oleg V Prezhdo Zhi-Heng Loh

Recent observations of excitonic coherences within photosynthetic complexes suggest that quantum coherences could enhance biological light harvesting efficiencies. Here, we employ optical pump-probe spectroscopy with few-femtosecond pulses to observe an excitonic quantum coherence in CdSe nanocrystals, a prototypical artificial light harvesting system. This coherence, which encodes the high-spe...

Journal: :Plant physiology 1983
K Eskins M E Duysen L Olson

Pigment-protein complexes separated from wheat (Triticum aestivum L. selection ND96-25 by two gel electrophoresis techniques were analyzed by high-performance liquid chromatography for chlorophylls and carotenoids. The two techniques are compared, and pigment analyses are given for the major reaction centers and light-harvesting complexes. Reaction centers contain mostly chlorophyll a, carotene...

2007
Luca Dall’Osto Alessia Fiore Stefano Cazzaniga Giovanni Giuliano Roberto Bassi

Xanthophylls (oxygenated carotenoids) are essential components of the plant photosynthetic apparatus, where they act in photosystem assembly, light harvesting and photoprotection. Nevertheless, the specific function of individual xanthophyll species awaits complete elucidation. In this work we analyze the photosynthetic phenotypes of two newly isolated Arabidopsis mutants in carotenoid biosynth...

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