scholarly journals Photocurrents from photosystem II in a metal oxide hybrid system: Electron transfer pathways

2016 ◽  
Vol 1857 (9) ◽  
pp. 1497-1505 ◽  
Author(s):  
Katharina Brinkert ◽  
Florian Le Formal ◽  
Xiaoe Li ◽  
James Durrant ◽  
A. William Rutherford ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photosystem Ii ◽  
Metal Oxide ◽  
Hybrid System ◽  
Electron Transfer Pathways

scholarly journals Autotrophic and Mixotrophic Hydrogen Photoproduction in Sulfur-Deprived Chlamydomonas Cells

2005 ◽  
Vol 71 (10) ◽  
pp. 6199-6205 ◽  
Author(s):  
Swanny Fouchard ◽  
Anja Hemschemeier ◽  
Amandine Caruana ◽  
Jérémy Pruvost ◽  
Jack Legrand ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photosystem Ii ◽  
Photosynthetic Activity ◽  
The Other ◽  
Starch Accumulation ◽  
Sulfur Deficiency ◽  
Sulfur Deprivation ◽  
Hydrogen Photoproduction ◽  
Electron Transfer Pathways ◽  
Mixotrophic Conditions

ABSTRACT In Chlamydomonas reinhardtii cells, H2 photoproduction can be induced in conditions of sulfur deprivation in the presence of acetate. The decrease in photosystem II (PSII) activity induced by sulfur deprivation leads to anoxia, respiration becoming higher than photosynthesis, thereby allowing H2 production. Two different electron transfer pathways, one PSII dependent and the other PSII independent, have been proposed to account for H2 photoproduction. In this study, we investigated the contribution of both pathways as well as the acetate requirement for H2 production in conditions of sulfur deficiency. By using 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), a PSII inhibitor, which was added at different times after the beginning of sulfur deprivation, we show that PSII-independent H2 photoproduction depends on previously accumulated starch resulting from previous photosynthetic activity. Starch accumulation was observed in response to sulfur deprivation in mixotrophic conditions (presence of acetate) but also in photoautotrophic conditions. However, no H2 production was measured in photoautotrophy if PSII was not inhibited by DCMU, due to the fact that anoxia was not reached. When DCMU was added at optimal starch accumulation, significant H2 production was measured. H2 production was enhanced in autotrophic conditions by removing O2 using N2 bubbling, thereby showing that substantial H2 production can be achieved in the absence of acetate by using the PSII-independent pathway. Based on these data, we discuss the possibilities of designing autotrophic protocols for algal H2 photoproduction.

scholarly journals Conversion of Methanol on Rutile TiO2 (110) and Tungsten Oxide Clusters: 2. The Role of Defects and Electron Transfer in Bifunctional Oxidic Photocatalysts

2021 ◽  
Author(s):  
Lars Mohrhusen ◽  
Jessica Kräuter ◽  
Katharina Al-Shamery
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Metal Oxide ◽  
Tungsten Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Organic P ◽  
Rutile Tio2 ◽  
Metal Oxide Surfaces

The photochemical conversion of organic compounds on tailored transition metal oxide surfaces by (UV) irradiation has found wide applications ranging from the production of chemicals to the degradation of organic...

scholarly journals Electron transfer pathways in photoexcited lanthanide(III) complexes of picolinate ligands

2021 ◽  
Author(s):  
Daniel Kovacs ◽  
Daniel Kocsi ◽  
Jordann A. L. Wells ◽  
Salauat R. Kiraev ◽  
Eszter Borbas
Keyword(s):  
Electron Transfer ◽  
Metal Binding ◽  
Binding Sites ◽  
Secondary Amide ◽  
Metal Binding Sites ◽  
Electron Transfer Pathways

A series of luminescent lanthanide(III) complexes consisting of 1,4,7-triazacyclononane frameworks and three secondary amide-linked carbostyril antennae were synthesised. The metal binding sites were augmented with two pyridylcarboxylate donors yielding octadentate...

Revealing the Relationship between Semiconductor Electronic Structure and Electron Transfer Dynamics at Metal Oxide–Chromophore Interfaces

2013 ◽  
Vol 117 (48) ◽  
pp. 25259-25268 ◽  
Author(s):  
Robin R. Knauf ◽  
M. Kyle Brennaman ◽  
Leila Alibabaei ◽  
Michael R. Norris ◽  
Jillian L. Dempsey
Keyword(s):  
Electron Transfer ◽  
Electronic Structure ◽  
Metal Oxide ◽  
Semiconductor Electronic ◽  
The Relationship
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