Light scattering calculations exploring sensitivity of depolarization ratio to shape changes I Single spores in air

2009 ◽  
Vol 48 (4) ◽  
pp. 716 ◽  
Author(s):  
Stephen D. Druger ◽  
Jozsef Czege ◽  
Zhaozhang Li ◽  
Burt V. Bronk
Keyword(s):  
Light Scattering ◽  
Depolarization Ratio ◽  
Shape Changes

Light scattering calculations exploring sensitivity of depolarization ratio to shape changes II Single rod-shaped vegetative bacteria in air

2009 ◽  
Vol 48 (30) ◽  
pp. 5655 ◽  
Author(s):  
Burt V. Bronk ◽  
Stephen D. Druger
Keyword(s):  
Light Scattering ◽  
Depolarization Ratio ◽  
Shape Changes

scholarly journals Shape oscillations of human neutrophil leukocytes: characterization and relationship to cell motility.

1996 ◽  
Vol 199 (4) ◽  
pp. 741-747
Author(s):  
M U Ehrengruber ◽  
D A Deranleau ◽  
T D Coates
Keyword(s):  
Light Scattering ◽  
Actin Polymerization ◽  
Cellular Migration ◽  
Human Neutrophils ◽  
Filamentous Actin ◽  
Cytoskeletal Component ◽  
Morphological Polarity ◽  
Shape Oscillations ◽  
Shape Changes ◽  
Neutrophil Leukocytes

When neutrophil leukocytes are stimulated by chemotactic factors or by substratum contact, they change their shape. Shape changes are a prerequisite for cellular migration and typically involve the extrusion of thin, veil-like lamellipods and the development of morphological polarity. Stimulation also leads to changes in the neutrophil content of filamentous actin (F-actin), which is the major cytoskeletal component. Suspensions of human neutrophils stimulated with chemoattractants exhibit sinusoidal light-scattering oscillations with a period of approximately 8 s at 37 degrees C. These oscillations arise from periodic fluctuations in the cell body size caused by lamellipod extension and retraction cycles. The light-scattering oscillations are paralleled by corresponding oscillations in F-actin content. This raises the interesting possibility that cyclic actin polymerization constitutes the driving force for shape oscillations of suspended neutrophils. Similar periodic shape changes are present in neutrophils crawling on a surface, suggesting that shape oscillations are important for neutrophil motion. This review summarizes our present knowledge about shape oscillations in suspended and crawling neutrophils and discusses a possible role for these oscillations in neutrophil motility.

scholarly journals Osmotically Induced Shape Changes of Large Unilamellar Vesicles Measured by Dynamic Light Scattering

2001 ◽  
Vol 81 (5) ◽  
pp. 2716-2728 ◽  
Author(s):  
Jeremy Pencer ◽  
Gisèle F. White ◽  
F. Ross Hallett
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Unilamellar Vesicles ◽  
Large Unilamellar Vesicles ◽  
Shape Changes

Density dependence of light scattering from nitrogen: Permanent and collisional effects and their interferences

1981 ◽  
Vol 59 (10) ◽  
pp. 1510-1513 ◽  
Author(s):  
J. Bérrué ◽  
A. Chave ◽  
B. Dumon ◽  
M. Thibeau
Keyword(s):  
Experimental Data ◽  
Light Scattering ◽  
Theoretical Calculation ◽  
Density Dependence ◽  
Depolarization Ratio ◽  
Gaseous Nitrogen ◽  
Ratio Versus

The light scattering from gaseous nitrogen at 310 K and pressures up to 440 bar is studied; the depolarization ratio versus the density is plotted. A theoretical calculation taking into account the light scattered from the permanent polarizabilities, the collisional ones, and their interferences is given. The agreement with the experimental data is rather good.

scholarly journals Light Scattering by Pure Water and Seawater: Recent Development

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xiaodong Zhang ◽  
Lianbo Hu
Keyword(s):  
Light Scattering ◽  
Pure Water ◽  
Critical Role ◽  
Extreme Environments ◽  
Electrolyte Solutions ◽  
Ocean Optics ◽  
Depolarization Ratio ◽  
Spectral Absorption ◽  
Molecular Scattering ◽  
Recent Developments

Light scattering by pure water and seawater is a fundamental optical property that plays a critical role in ocean optics and ocean color studies. We briefly review the theory of molecular scattering in liquid and electrolyte solutions and focus on the recent developments in modeling the effect of pressure, extending to extreme environments, and evaluating the effect of salinity on the depolarization ratio. We demonstrate how the modeling of seawater scattering can be applied to better understand spectral absorption and attenuation of pure water and seawater. We recommend future efforts should be directed at measuring the polarized components of scattering by pure water over a greater range of wavelengths, temperature, salinity, and pressure to constrain and validate the model and to improve our knowledge of the water’s depolarization ratio.

General expression for the depolarization ratio for first-order collision-induced light scattering

2010 ◽  
Vol 42 (5) ◽  
pp. 1046-1048 ◽  
Author(s):  
A. Senchuk ◽  
G. C. Tabisz
Keyword(s):  
Light Scattering ◽  
General Expression ◽  
Depolarization Ratio ◽  
First Order

The Proton Distribution in Ice —Ih Investigated by Light Scattering

1976 ◽  
Vol 31 (12) ◽  
pp. 1526-1531 ◽  
Author(s):  
R. Claus ◽  
W. Plagge ◽  
J. Bilgram
Keyword(s):  
Light Scattering ◽  
Wave Vector ◽  
Light Wave ◽  
Depolarization Ratio ◽  
Single Crystalline ◽  
Proton Distribution ◽  
Dispersion Effects ◽  
Ferroelectric Domains ◽  
Vector Direction ◽  
Stretching Vibrations

Abstract Oriented single crystalline samples of Ih-ice have been investigated by light scattering. The lade of observable phonon directional dispersion effects shows that ferroelectric domains with dimensions of the order of light wave lengths as stated earlier in the literature, do not exist. The depolarization ratio of the phonons originating from O-H stretching vibrations is found to be independent of the wave vector direction. This demonstrates clearly that the proton distribution is statistical.

Collection Angle Dependence of the Depolarization Ratio in Light-Scattering Experiments

1992 ◽  
Vol 46 (3) ◽  
pp. 476-478 ◽  
Author(s):  
V. Teboul ◽  
J. L. Godet ◽  
Y. Le Duff
Keyword(s):  
Light Scattering ◽  
Depolarization Ratio ◽  
Angle Dependence ◽  
Scattering Experiment ◽  
Scattered Beam

We have calculated, in a typical scattering experiment, the exact value of the intensity scattered by a sample for any value of the collection angle of the scattered beam and for different beam polarizations.

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