Determination of the Superradiance Coherence Length of Directly Linked Linear Porphyrin Arrays at the Single-Molecule Level

2009 ◽  
Vol 121 (24) ◽  
pp. 4387-4391 ◽  
Author(s):  
Jaesung Yang ◽  
Hyejin Yoo ◽  
Naoki Aratani ◽  
Atsuhiro Osuka ◽  
Dongho Kim
Keyword(s):  
Single Molecule ◽  
Coherence Length ◽  
Single Molecule Level

Determination of the Superradiance Coherence Length of Directly Linked Linear Porphyrin Arrays at the Single-Molecule Level

2009 ◽  
Vol 48 (24) ◽  
pp. 4323-4327 ◽  
Author(s):  
Jaesung Yang ◽  
Hyejin Yoo ◽  
Naoki Aratani ◽  
Atsuhiro Osuka ◽  
Dongho Kim
Keyword(s):  
Single Molecule ◽  
Coherence Length ◽  
Single Molecule Level

scholarly journals Single–motor mechanics and models of the myosin motor

2000 ◽  
Vol 355 (1396) ◽  
pp. 441-447 ◽  
Author(s):  
T. Yanagida ◽  
S. Esaki ◽  
A. Hikikoshi Iwane ◽  
Y. Inoue ◽  
A. Ishijima ◽  
...  
Keyword(s):  
Single Molecule ◽  
Atp Hydrolysis ◽  
Accurate Determination ◽  
Step Size ◽  
Single Molecule Level ◽  
Detection Techniques ◽  
Myosin Motor ◽  
Mechanochemical Coupling ◽  
Chemical Events

Recent progress in single–molecule detection techniques is remarkable. These techniques have allowed the accurate determination of myosin–head–induced displacements and how mechanical cycles are coupled to ATP hydrolysis, by measuring individual mechanical events and chemical events of actomyosin directly at the single–molecule level. Here we review our recent work in which we have made detailed measurements of myosin step size and mechanochemical coupling, and propose a model of the myosin motor.

Does Seebeck Coefficient of Single Molecule Junctions Depend on the Junction Configuration?

2021 ◽  
Author(s):  
František Vavrek ◽  
Olena Butsyk ◽  
Viliam Kolivoska ◽  
Stepanka Lachmanova ◽  
Táňa Sebechlebská ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Experimental Method ◽  
Simultaneous Determination ◽  
Thermoelectric Properties ◽  
Single Molecule ◽  
Single Molecule Level ◽  
Single Molecule Junctions

New experimental method for simultaneous determination of electric and thermoelectric properties of metal‒molecule‒metal junctions at the single molecule level have been developed to test the effect of the junction configuration...

scholarly journals Excitation energy migration processes in various multi-porphyrin assemblies

2012 ◽  
Vol 370 (1972) ◽  
pp. 3802-3818 ◽  
Author(s):  
Jaesung Yang ◽  
Dongho Kim
Keyword(s):  
Excitation Energy ◽  
Single Molecule ◽  
Coherence Length ◽  
Radiative Decay ◽  
Transient Absorption ◽  
Excitation Energy Transfer ◽  
Building Blocks ◽  
Linear Arrays ◽  
Single Molecule Level ◽  
Structural Distortions

The electronic interactions and excitation energy transfer (EET) processes of a variety of multi-porphyrin arrays with linear, cyclic and box architectures have been explored. Directly meso – meso linked linear arrays ( Z N ) exhibit strong excitonic coupling with an exciton coherence length of approximately 6 porphyrin units, while fused linear arrays ( T N ) exhibit extensive π -conjugation over the whole array. The excitonic coherence length in directly linked cyclic porphyrin rings ( CZ N ) was determined to be approximately 2.7 porphyrin units by simultaneous analysis of fluorescence intensities and lifetimes at the single-molecule level. By performing transient absorption (TA) and TA anisotropy decay measurements, the EET rates in m -phenylene linked cyclic porphyrin wheels C12ZA and C24ZB were determined to be 4 and 36 ps −1 , respectively. With increasing the size of C N ZA , the EET efficiencies decrease owing to the structural distortions that produce considerable non-radiative decay pathways. Finally, the EET rates of self-assembled porphyrin boxes consisting of directly linked diporphyrins, B1A , B2A and B3A , are 48, 98 and 361 ps −1 , respectively. The EET rates of porphyrin boxes consisting of alkynylene-bridged diporphyrins, B2B and B4B , depend on the conformation of building blocks (planar or orthogonal) rather than the length of alkynylene linkers.

Determination of the diffusion coefficient of dye in solution at single molecule level

1997 ◽  
Vol 269 (1-2) ◽  
pp. 54-58 ◽  
Author(s):  
D.-S. Ko ◽  
M. Sauer ◽  
S. Nord ◽  
R. Müller ◽  
J. Wolfrum
Keyword(s):  
Diffusion Coefficient ◽  
Single Molecule ◽  
Single Molecule Level
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