Exploring the role of the surface states in the luminescence of gold spherical particles by single molecule spectroscopy

2010 ◽  
Author(s):  
Matthieu Loumaigne ◽  
Anne Débarre
Keyword(s):  
Single Molecule ◽  
Surface States ◽  
Spherical Particles ◽  
Single Molecule Spectroscopy

scholarly journals Stability of a Nonequilibrium Biochemical Cycle Revealed by Single-Molecule Spectroscopy

2021 ◽  
Author(s):  
Saurabh Talele ◽  
John T King
Keyword(s):  
Entropy Production ◽  
Single Molecule ◽  
Nonequilibrium Dynamics ◽  
Single Molecule Spectroscopy ◽  
Reaction Cycle ◽  
Central Interest ◽  
Thermodynamic Driving Force ◽  
Reaction Cycles ◽  
Thermal Stability Of

Biological machinery relies on nonequilibrium dynamics to maintain stable directional fluxes through complex reaction cycles. In stabilizing the reaction cycle, the role of microscopic irreversibility of elementary transitions, and the accompanying entropy production, is of central interest. Here, we use multidimensional single-molecule spectroscopy to demonstrate that the reaction cycle of bacteriorhodopsin is coupled through both reversible and irreversible transitions, with directionality of trans-membrane H+ transport being ensured by the entropy production of irreversible transitions. We observe that thermal destabilization of the process is the result of diminishing thermodynamic driving force for irreversible transitions, leading to an exponentially increasing variance of flux through the transitions. We show that the thermal stability of the reaction cycle can be predicted from the Gibbs-Helmholtz relation.

scholarly journals Role of Denatured-State Properties in Chaperonin Action Probed by Single-Molecule Spectroscopy

2014 ◽  
Vol 107 (12) ◽  
pp. 2891-2902 ◽  
Author(s):  
Hagen Hofmann ◽  
Frank Hillger ◽  
Cyrille Delley ◽  
Armin Hoffmann ◽  
Shawn H. Pfeil ◽  
...  
Keyword(s):  
Single Molecule ◽  
Single Molecule Spectroscopy ◽  
Denatured State

scholarly journals Interaction of theory and experiment: examples from single molecule studies of nanoparticles

2010 ◽  
Vol 368 (1914) ◽  
pp. 1109-1124 ◽  
Author(s):  
Rudolph A. Marcus
Keyword(s):  
Single Molecule ◽  
Large Body ◽  
Surface States ◽  
Biological Species ◽  
Theoretical Chemistry ◽  
Past Half Century ◽  
Single Molecule Studies ◽  
Computer Calculations ◽  
Complementary Nature

This article is in part the author's perspective on the revolution that has occurred in theoretical chemistry during the past half-century. In this period much of theoretical chemistry has moved from its initial emphasis on analytic treatments, resulting in equations for physical chemical and chemical phenomena, to the detailed computation of many different systems and processes. In the best sense the old and the new are complementary and their coexistence can benefit both. Experiment too has seen major developments. One of the newer types of experiment is that of single molecule studies. They range from those on small inorganic and organic nanoparticles to large biological species. We illustrate some of the issues that arise, using the topic of ‘quantum dots’ (QDs), and choosing a particular inorganic nanoparticle, CdSe, the most studied of these systems. Its study reflects the problems that arise in experiment and in theories in this field. The complementary nature of the conventional ensemble experiments and the new single molecule experiments is described and is illustrated by trajectories for the two types of experiments. The research in the QD field is both experimentally and theoretically a currently ongoing process, for which the answers are not fully known in spite of the large body of research. The detailed role of surface states is part of the problem. The field continues to yield new and unexpected results. In a sense this part of the article is an interim report that illustrates one analytic approach to the topic and where computer calculations and simulations can be expected to provide added insight.

Role of rare sites in single molecule spectroscopy measurements of spectral diffusion

2001 ◽  
Vol 114 (23) ◽  
pp. 10479-10485 ◽  
Author(s):  
Douglas S. English ◽  
Elizabeth J. Harbron ◽  
Paul F. Barbara
Keyword(s):  
Single Molecule ◽  
Spectral Diffusion ◽  
Single Molecule Spectroscopy

On the role of spectral diffusion in single-molecule spectroscopy

2000 ◽  
Vol 42 (3) ◽  
pp. 477-480 ◽  
Author(s):  
V. V. Palm ◽  
K. K. Rebane ◽  
A. Zabrodskii
Keyword(s):  
Single Molecule ◽  
Spectral Diffusion ◽  
Single Molecule Spectroscopy

Role of missing carotenoid in reducing the fluorescence of single monomeric photosystem II core complexes

2017 ◽  
Vol 19 (20) ◽  
pp. 13189-13194 ◽  
Author(s):  
Sepideh Skandary ◽  
Frank Müh ◽  
Imran Ashraf ◽  
Mohamed Ibrahim ◽  
Michael Metzger ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Single Molecule ◽  
Single Molecule Spectroscopy

The fluorescence of monomeric photosystem II core complexes of the cyanobacterium T. elongatus, originating from redissolved crystals, is investigated by using single-molecule spectroscopy.

scholarly journals Click Chemistry: Mechanistic Insights into the Role of Amines Using Single-Molecule Spectroscopy

ACS Catalysis ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 8487-8492 ◽  
Author(s):  
Bowen Wang ◽  
Anabel E. Lanterna ◽  
Juan C. Scaiano
Keyword(s):  
Click Chemistry ◽  
Single Molecule ◽  
Single Molecule Spectroscopy
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