Electrical evidence for the field indicating absorption change in bioenergetic membranes

doi:10.1016/0014-5793(73)80484-3

Cited by 97 publications

(4 citation statements)

References 10 publications

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“…In green organisms like C. reinhardtii , the increase in absorption at 520 nm is proportional to the light-induced transmembrane electrical field and thus provides a direct measure of the number of charges that are transferred, upon illumination, from one side of the membrane to the other59. The slope of the light-induced absorption changes is thus proportional to the number of charges transferred per unit of time (see Fig.…”

Section: Methodsmentioning

confidence: 99%

Cyclic electron flow is redox-controlled but independent of state transition

et al. 2013

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Photosynthesis is the biological process that feeds the biosphere with reduced carbon. The assimilation of CO2 requires the fine tuning of two co-existing functional modes: linear electron flow, which provides NADPH and ATP, and cyclic electron flow, which only sustains ATP synthesis. Although the importance of this fine tuning is appreciated, its mechanism remains equivocal. Here we show that cyclic electron flow as well as formation of supercomplexes, thought to contribute to the enhancement of cyclic electron flow, are promoted in reducing conditions with no correlation with the reorganization of the thylakoid membranes associated with the migration of antenna proteins towards Photosystems I or II, a process known as state transition. We show that cyclic electron flow is tuned by the redox power and this provides a mechanistic model applying to the entire green lineage including the vast majority of the cases in which state transition only involves a moderate fraction of the antenna.

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Section: Methodsmentioning

confidence: 99%

Cyclic electron flow is redox-controlled but independent of state transition

et al. 2013

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“…While repetitive laser represents a limit case of the chopped beam, application of short pulses permits time-resolved measurements. Interestingly, a related approach has been utilized in the studies of the photosynthetic reaction centers in the essentially 3D membrane suspension samples [91,92]. …”

Section: Resultsmentioning

confidence: 99%

Molecular Photovoltaics in Nanoscale Dimension

Burtman

Zelichonok

Pakoulev

2011

IJMS

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This review focuses on the intrinsic charge transport in organic photovoltaic (PVC) devices and field-effect transistors (SAM-OFETs) fabricated by vapor phase molecular self-assembly (VP-SAM) method. The dynamics of charge transport are determined and used to clarify a transport mechanism. The 1,4,5,8-naphthalene-tetracarboxylic diphenylimide (NTCDI) SAM devices provide a useful tool to study the fundamentals of polaronic transport at organic surfaces and to discuss the performance of organic photovoltaic devices in nanoscale. Time-resolved photovoltaic studies allow us to separate the charge annihilation kinetics in the conductive NTCDI channel from the overall charge kinetic in a SAM-OFET device. It has been demonstrated that tuning of the type of conductivity in NTCDI SAM-OFET devices is possible by changing Si substrate doping. Our study of the polaron charge transfer in organic materials proposes that a cation-radical exchange (redox) mechanism is the major transport mechanism in the studied SAM-PVC devices. The role and contribution of the transport through delocalized states of redox active surface molecular aggregates of NTCDI are exposed and investigated. This example of technological development is used to highlight the significance of future technological development of nanotechnologies and to appreciate a structure-property paradigm in organic nanostructures.

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“…A technique based on differential absorption of visible light, which is growing in interest, is termed Dark Interval Relaxation Kinetic (DIRK) analyses of the electrochromic shift (ECS; Sacksteder & Kramer, 2000 ). The ECS is a trans‐thylakoid (Figure 1 ), ΔΨ‐induced shift in the absorption spectra of certain carotenoids, the maximum amplitude of which occurs at ~520 nm, that are bound by intra‐thylakoid‐membrane light‐absorbing proteins (Witt & Zickler, 1973 ). DIRK analyses of the ECS have been extensively adapted to monitor leaf‐level photosynthetic processes that cause changes in the trans‐thylakoid ΔΨ (Cruz et al, 2001 ; Kramer, Avenson, & Edwards, 2004 ; Sacksteder et al, 2000 ).…”

Section: Introductionmentioning

confidence: 99%

Fresh perspectives on an established technique: Pulsed amplitude modulation chlorophyll a fluorescence

Zuo

Aiken

Feng

et al. 2022

Plant Enviro Interactions

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Pulsed amplitude modulation (PAM) chlorophyll a fluorescence provides information about photosynthetic energy transduction. When reliably measured, chlorophyll a fluorescence provides detailed information about critical in vivo photosynthetic processes. Such information has recently provided novel and critical insights into how the yield potential of crops can be improved and it is being used to understand remotely sensed fluorescence, which is termed solar-induced fluorescence and will be solely measured by a satellite scheduled to be launched this year. While PAM chlorophyll a fluorometers measure fluorescence intensity per se, herein we articulate the axiomatic criteria by which instrumentally detected intensities can be assumed to assess fluorescence yield, a phenomenon quite different than fluorescence intensity and one that provides critical insight about how solar energy is variably partitioned into the biosphere. An integrated mathematical, phenomenological, and practical discussion of many useful chlorophyll a fluorescence parameters is presented. We draw attention to, and provide examples of, potential uncertainties that can result from incorrect methodological practices and potentially problematic instrumental design features. Fundamentals of fluorescence measurements are discussed, including the major assumptions underlying the signals and the methodological caveats about taking measurements during both dark-and light-adapted conditions. Key fluorescence parameters are discussed in the context of recent applications under environmental stress. Nuanced information that can be gleaned from intra-comparisons of fluorescence-derived parameters and intercomparisons of fluorescence-derived parameters with those based on other techniques is elucidated.

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Electrical evidence for the field indicating absorption change in bioenergetic membranes

Cited by 97 publications

References 10 publications

Cyclic electron flow is redox-controlled but independent of state transition

Cyclic electron flow is redox-controlled but independent of state transition

Molecular Photovoltaics in Nanoscale Dimension

Fresh perspectives on an established technique: Pulsed amplitude modulation chlorophyll a fluorescence

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