Investigation of Laminar and Turbulent Flows by Means of Light Scattering

Crosignani, B.; Porto, P. Di

doi:10.1007/978-1-4615-8906-8_12

Photon Correlation and Light Beating Spectroscopy 1974

DOI: 10.1007/978-1-4615-8906-8_12

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Investigation of Laminar and Turbulent Flows by Means of Light Scattering

B. Crosignani

P. Di Porto

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1975

1976

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Cited by 2 publications

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Cytoplasmic streaming in Chara corallina studied by laser light scattering

Sattelle¹,

Buchan²

1976

Journal of Cell Science

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An apparatus is described by means of which the power versus frequency spectrum of the photomultiplier current can be obtained for laser light scattered by streaming cytoplasm in the algal cell Chara corallina. A Doppler peak is noted in the spectrum which is abolished when cytoplasmic streaming is arrested by electrical stimulation. For 5 cells of Chara, this simple laser-Doppler velocimeter gave streaming velocities (46-7 mum s-1, S.D. +/− 4–8 at 20 degrees C) similar to those obtained for the same cells using the light microscope (44-3 mum s-1, S.D. +/− 5-3 at 20 degrees C). A narrow distribution of streaming velocities is indicated. The technique described provides a rapid, quantitative assay of the in vivo rheological properties of cytoplasm.

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Cytoplasmic streaming in Chara corallina studied by laser light scattering

Sattelle¹,

Buchan²

1976

Journal of Cell Science

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Potassium-induced motion increase in a central nervous ganglion

Sattelle

Piddington

1975

Journal of Experimental Biology

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1. By means of light-beating spectroscopy, a four-fold increase in the modulation of laser light scattered at right angles by a locust (Schistocerca gregaria, Forskal) ganglion is detected when potassium ions replace sodium ions in the Ringer solution. 2. This is interpreted as an increased level of motion of the scattering particles (size 0.3-3.0 mum, if viscosity is taken to be 0.01 poises). 3. The amplitude of the potassium-response is similar at all frequencies in the range 6.3-150 Hz and is reversible on return to normal (Na+) Ringer. 4. Desheathing the ganglion reduces the half-time of the potassium-response by 3–4 times. 5. By means of photon-correlation spectroscopy it was estimated that less than 10% of the tissue contributes to the motion detected. 6. Cyanide (1–2 mM) typically enhances the potassium-response and renders it irreversible, suggesting that the response is thermally rather than metabolically-driven. In addition, the dependence of both the correlation function and the power spectrum on the scattering angle is in the direction predicted for a diffusive process. 7. Cobaltous ions (2–10 mM), which block calcium entry into nerve cells, depress the potassium-response. 8. It is proposed that potassium-depolarization and the resultant calcium entry into the cells causes a partial liquefaction of the cytoplasms which is detected as an increase in the level of Brownian motion. This mechanism could be used in vesicular release or in growth.

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Investigation of Laminar and Turbulent Flows by Means of Light Scattering

Cited by 2 publications

References 18 publications

Cytoplasmic streaming in Chara corallina studied by laser light scattering

Cytoplasmic streaming in Chara corallina studied by laser light scattering

Potassium-induced motion increase in a central nervous ganglion

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