Experimental investigation of test particle induced micro-structural changes in a finite two-dimensional complex plasma crystal

2019 ◽  
Vol 26 (10) ◽  
pp. 103701
Author(s):  
M. G. Hariprasad ◽  
P. Bandyopadhyay ◽  
Garima Arora ◽  
A. Sen
Keyword(s):  
Experimental Investigation ◽  
Test Particle ◽  
Structural Changes ◽  
Two Dimensional ◽  
Complex Plasma ◽  
Plasma Crystal

scholarly journals Full melting of a two-dimensional complex plasma crystal triggered by localized pulsed laser heating

2018 ◽  
Vol 97 (4) ◽  
Author(s):  
L. Couëdel ◽  
V. Nosenko ◽  
M. Rubin-Zuzic ◽  
S. Zhdanov ◽  
Y. Elskens ◽  
...  
Keyword(s):  
Laser Heating ◽  
Pulsed Laser ◽  
Two Dimensional ◽  
Complex Plasma ◽  
Plasma Crystal ◽  
Pulsed Laser Heating

scholarly journals Tracking and Linking of Microparticle Trajectories During Mode-Coupling Induced Melting in a Two-Dimensional Complex Plasma Crystal

2019 ◽  
Vol 5 (3) ◽  
pp. 41
Author(s):  
Lénaïc Couëdel ◽  
Vladimir Nosenko
Keyword(s):  
Mode Coupling ◽  
Signal To Noise Ratio ◽  
Scattered Light ◽  
Three Dimensional ◽  
Light Sheet ◽  
Noise Removal ◽  
Two Dimensional ◽  
Complex Plasma ◽  
Plasma Crystal ◽  
Mode Coupling Instability

In this article, a strategy to track microparticles and link their trajectories adapted to the study of the melting of a quasi two-dimensional complex plasma crystal induced by the mode-coupling instability is presented. Because of the three-dimensional nature of the microparticle motions and the inhomogeneities of the illuminating laser light sheet, the scattered light intensity can change significantly between two frames, making the detection of the microparticles and the linking of their trajectories quite challenging. Thanks to a two-pass noise removal process based on Gaussian blurring of the original frames using two different kernel widths, the signal-to-noise ratio was increased to a level that allowed a better intensity thresholding of different regions of the images and, therefore, the tracking of the poorly illuminated microparticles. Then, by predicting the positions of the microparticles based on their previous positions, long particle trajectories could be reconstructed, allowing accurate measurement of the evolution of the microparticle energies and the evolution of the monolayer properties.

scholarly journals Laser-stimulated melting of a two-dimensional complex plasma crystal

2018 ◽  
Author(s):  
L. Couëdel ◽  
V. Nosenko ◽  
M. Rubin-Zuzic ◽  
S. Zhdanov ◽  
A. Ivlev
Keyword(s):  
Two Dimensional ◽  
Complex Plasma ◽  
Plasma Crystal

scholarly journals Transport properties of disordered two-dimensional complex plasma crystal

2018 ◽  
Vol 58 (2-3) ◽  
pp. 209-216 ◽  
Author(s):  
E.G. Kostadinova ◽  
F. Guyton ◽  
A. Cameron ◽  
K. Busse ◽  
C. Liaw ◽  
...  
Keyword(s):  
Transport Properties ◽  
Two Dimensional ◽  
Complex Plasma ◽  
Plasma Crystal

scholarly journals Channeling of particles and associated anomalous transport in a two-dimensional complex plasma crystal

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
Cheng-Ran Du ◽  
Vladimir Nosenko ◽  
Sergey Zhdanov ◽  
Hubertus M. Thomas ◽  
Gregor E. Morfill
Keyword(s):  
Anomalous Transport ◽  
Two Dimensional ◽  
Complex Plasma ◽  
Plasma Crystal

Cryo-electron microscopy of two-dimensional crystals of reduced type B botulinum neurotoxin

1992 ◽  
Vol 50 (1) ◽  
pp. 530-531
Author(s):  
P. F. Flicker ◽  
V.S. Kulkarni ◽  
J. P. Robinson ◽  
G. Stubbs ◽  
B. R. DasGupta
Keyword(s):  
Disulfide Bonds ◽  
Clostridium Botulinum ◽  
Structural Changes ◽  
Two Dimensional ◽  
Type B ◽  
Single Chain ◽  
Muscle Paralysis ◽  
Cryo Electron Microscopy ◽  
Disulfide Linkages ◽  
Intracellular Action

Botulinum toxin is a potent neurotoxin produced by Clostridium botulinum. The toxin inhibits release of neurotransmitter, causing muscle paralysis. There are several serotypes, A to G, all of molecular weight about 150,000. The protein exists as a single chain or or as two chains, with two disulfide linkages. In a recent investigation on intracellular action of neurotoxins it was reported that type B neurotoxin can inhibit the release of Ca++-activated [3H] norepinephrine only if the disulfide bonds are reduced. In order to investigate possible structural changes in the toxin upon reduction of the disulfide bonds, we have prepared two-dimensional crystals of reduced type B neurotoxin. These two-dimensional crystals will be compared with those of the native (unreduced) type B toxin.

Plane turbulent jets in a bounded fluid layer

1992 ◽  
Vol 241 ◽  
pp. 587-614 ◽  
Author(s):  
T. Dracos ◽  
M. Giger ◽  
G. H. Jirka
Keyword(s):  
Experimental Investigation ◽  
Cross Section ◽  
Fluid Layer ◽  
Three Dimensional ◽  
Turbulent Jets ◽  
Two Dimensional ◽  
Vortical Structures ◽  
Secondary Currents ◽  
Fluid Layers ◽  
Bounding Surfaces

An experimental investigation of plane turbulent jets in bounded fluid layers is presented. The development of the jet is regular up to a distance from the orifice of approximately twice the depth of the fluid layer. From there on to a distance of about ten times the depth, the flow is dominated by secondary currents. The velocity distribution over a cross-section of the jet becomes three-dimensional and the jet undergoes a constriction in the midplane and a widening near the bounding surfaces. Beyond a distance of approximately ten times the depth of the bounded fluid layer the secondary currents disappear and the jet starts to meander around its centreplane. Large vortical structures develop with axes perpendicular to the bounding surfaces of the fluid layer. With increasing distance the size of these structures increases by pairing. These features of the jet are associated with the development of quasi two-dimensional turbulence. It is shown that the secondary currents and the meandering do not significantly affect the spreading of the jet. The quasi-two-dimensional turbulence, however, developing in the meandering jet, significantly influences the mixing of entrained fluid.

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