The carotenoid zeaxanthin and ‘high-energy-state quenching’ of chlorophyll fluorescence

1990 ◽  
Vol 25 (3) ◽  
pp. 187-197 ◽  
Author(s):  
Barbara Demmig-Adams ◽  
William W. Adams
Keyword(s):  
Chlorophyll Fluorescence ◽  
Energy State ◽  
High Energy ◽  
High Energy State

Light-Dependent Interactions of Phenazine Methosulfate with 3-(3,4-Dichlorophenyl)-1,1-dimethylurea-Poisoned Chloroplasts

1976 ◽  
Vol 31 (11-12) ◽  
pp. 722-729 ◽  
Author(s):  
Bernd Schmidt ◽  
Hans Rurainski
Keyword(s):  
Chlorophyll Fluorescence ◽  
Transient Absorption ◽  
Energy State ◽  
Spectral Characteristics ◽  
High Energy ◽  
Phenazine Methosulfate ◽  
Experimental Conditions ◽  
Absorption Change ◽  
High Energy State ◽  
Isolated Chloroplasts

Abstract The chlorophyll fluorescence of isolated chloroplasts in the presence of phenazine methosulfate (PMS) and 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) can be quenched in a light-dependent reaction. This phenomenan has been studied and the following observations were made: 1. Quenching occurs under non-phosphorylating conditions and is stimulated by Mg2+ ions. 2. Under the same conditions, a light-dependent, Mg2+ stimulated transient decrease of absorp­ tion at 388 nm is observed which shows the spectral characteristics of PMS. 3. PMS is reversibly bound to chloroplasts. Under the experimental conditions used, binding amounts to as much as 0.5 mol PMS/mol chlorophyll. 4. Some uncouplers of photophosphorylation such as carbonylcyanide-m-chlorophenylhydrazon (CCCP) and atebrin analog abolish quenching, transient absorption change and binding of PMS. Others, such as methylamine, ammonia, gramicidin and nigericin do not. It is suggested that fluorescence quenching, transient absorption change and binding of PMS are causally related. The concept, postulated by others, that a high-energy state of the chloroplast membrane is involved in the fluorescence lowering is questioned.

High-energy state-to-state quantum dynamics for D+H2 (v=j=1) → HD (v′=1, j′) + H

1992 ◽  
Vol 188 (3-4) ◽  
pp. 359-367 ◽  
Author(s):  
Steven L. Mielke ◽  
Ronald S. Friedman ◽  
Donald G. Truhlar ◽  
David W. Schwenke
Keyword(s):  
Quantum Dynamics ◽  
Energy State ◽  
High Energy ◽  
High Energy State

Optimization of terahertz quantum cascade lasers by suppressing carrier leakage channel via high-energy state

2018 ◽  
Vol 11 (11) ◽  
pp. 112702 ◽  
Author(s):  
Tsung-Tse Lin ◽  
Li Wang ◽  
Ke Wang ◽  
Thomas Grange ◽  
Hideki Hirayama
Keyword(s):  
Quantum Cascade Lasers ◽  
Energy State ◽  
High Energy ◽  
Quantum Cascade ◽  
High Energy State ◽  
Cascade Lasers

The High-Energy State in Chloroplasts and Chromatophores

1972 ◽  
pp. 873-902 ◽  
Author(s):  
A. R. Crofts ◽  
J. B. Jackson ◽  
E. H. Evans ◽  
R. J. Cogdell
Keyword(s):  
Energy State ◽  
High Energy ◽  
High Energy State

A high-energy-state biomimetic enzyme of oxygen-deficient MnTiO3 nanodiscs for sensitive electrochemical sensing of the superoxide anion

2019 ◽  
Vol 55 (54) ◽  
pp. 7836-7839 ◽  
Author(s):  
Shenfei Zhao ◽  
Zhuanzhuan Shi ◽  
Chun Xian Guo ◽  
Chang Ming Li
Keyword(s):  
Superoxide Anion ◽  
Energy State ◽  
High Energy ◽  
Electrochemical Sensing ◽  
Surface Oxygen ◽  
Oxygen Defects ◽  
High Energy State ◽  
Inducing Surface

A high-energy-state biomimetic enzyme for the superoxide anion is presented by inducing surface oxygen defects in MnTiO3 nanodiscs.

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