scholarly journals Regular and chaotic motions of a single trapped ion interacting with a flashing ratchet potential

2007 ◽  
Vol 56 (3) ◽  
pp. 1305
Author(s):  
Chen Wen-Qin ◽  
Hai Wen-Hua ◽  
Li Hui ◽  
Ma Zhi-Ying
Keyword(s):  
Chaotic Motions ◽  
Trapped Ion ◽  
Flashing Ratchet ◽  
Ratchet Potential

POWER AND EFFICIENCY OF F1-ATPase MOLECULAR MOTOR

2012 ◽  
Vol 11 (01) ◽  
pp. 1240003
Author(s):  
J. M. SANCHO ◽  
RUBEN PEREZ-CARRASCO
Keyword(s):  
Experimental Data ◽  
Angular Velocity ◽  
Molecular Motor ◽  
Transition Rates ◽  
Motor Power ◽  
F1 Atpase ◽  
Flashing Ratchet ◽  
Model Predictions ◽  
Good Agreement ◽  
Ratchet Potential

We present the study of the energetics of the F1-ATPase rotatory molecular motor. The dynamics of this machine are described by a overdamped Langevin equation with a dichotomous flashing ratchet potential whose transition rates are controlled by an analysis of the chemical and physical steps. The model predictions on the observable angular velocity are in good agreement with the experimental data. Inspired by these results we extend our approach to study the energetics of this motor. Power and efficiency are analyzed for different experimental situations which can be tested in experiments.

scholarly journals Regular and chaotic motions of a single Paul-trapped ion interacting with double-δ-kicked pulses

2008 ◽  
Vol 57 (3) ◽  
pp. 1608
Author(s):  
Chen Wen-Qin ◽  
Hai Wen-Hua ◽  
Song Jian-Wen
Keyword(s):  
Chaotic Motions ◽  
Trapped Ion

DETERMINISTIC COLLECTIVE DIRECTIONAL TRANSPORT IN ONE-DIMENSIONAL FLASHING RATCHET POTENTIALS

2011 ◽  
Vol 25 (14) ◽  
pp. 1179-1192 ◽  
Author(s):  
HONGBIN CHEN ◽  
ZHIGANG ZHENG
Keyword(s):  
Molecular Motors ◽  
Thermal Fluctuations ◽  
Necessary Condition ◽  
Directed Motion ◽  
Flashing Ratchet ◽  
External Forces ◽  
Directional Transport ◽  
Shed Light ◽  
Good Agreement ◽  
Ratchet Potential

In the absence of thermal fluctuations and other external forces, a single particle will be pinned at the bottom of a flashing ratchet potential under the overdamped condition. Unidirectional motion becomes possible if there exist interactions among particles. In this paper, the overdamped directed motion of a dimer with two heads in a flashing ratchet potential is investigated. We propose the mechanism to reveal how two heads of the dimer cooperate and help each other to move processively. The necessary condition of directed motion is analytically given, which is in good agreement with numerical simulation results. Furthermore, the resonant steps of the current are observed and discussed. The scenario and the results proposed in this paper may shed light on the elaborations of artificial molecular motors.

Feedback control of two-headed Brownian motors in flashing ratchet potential

2010 ◽  
Vol 19 (11) ◽  
pp. 110506 ◽  
Author(s):  
A-Ke Zhao ◽  
Hong-Wei Zhang ◽  
Yu-Xiao Li
Keyword(s):  
Feedback Control ◽  
Brownian Motors ◽  
Flashing Ratchet ◽  
Ratchet Potential

Spatial Metabolomics of the Human Kidney Using MALDI Trapped Ion Mobility Imaging Mass Spectrometry

2020 ◽  
Author(s):  
Elizabeth Neumann ◽  
Lukasz Migas ◽  
Jamie L. Allen ◽  
Richard Caprioli ◽  
Raf Van de Plas ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Imaging Mass Spectrometry ◽  
Structural Complexity ◽  
Human Kidney ◽  
Resolving Power ◽  
Mobility Separation ◽  
Trapped Ion ◽  
Mobility Data ◽  
Ion Mobility Separation

<div> <div> <p>Small metabolites are essential for normal and diseased biological function but are difficult to study because of their inherent structural complexity. MALDI imaging mass spectrometry (IMS) of small metabolites is particularly challenging as MALDI matrix clusters are often isobaric with metabolite ions, requiring high resolving power instrumentation or derivatization to circumvent this issue. An alternative to this is to perform ion mobility separation before ion detection, enabling the visualization of metabolites without the interference of matrix ions. Here, we use MALDI timsTOF IMS to image small metabolites at high spatial resolution within the human kidney. Through this, we have found metabolites, such as arginic acid, acetylcarnitine, and choline that localize to the cortex, medulla, and renal pelvis, respectively. We have also demonstrated that trapped ion mobility spectrometry (TIMS) can resolve matrix peaks from metabolite signal and separate both isobaric and isomeric metabolites with different localizations within the kidney. The added ion mobility data dimension dramatically increased the peak capacity for molecular imaging experiments. Future work will involve further exploring the small metabolite profiles of human kidneys as a function of age, gender, and ethnicity.</p></div></div>

Realisation of a photonic link between a trapped ion and a semiconductor quantum dot

2014 ◽  
Author(s):  
Claire Le Gall ◽  
Robert Stockill ◽  
Matthias Steiner ◽  
Hendrik-Marten Meyer ◽  
Clemens Matthiesen ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Trapped Ion ◽  
Semiconductor Quantum Dot
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