scholarly journals The molecular weight of Artemia ribosomes, as determined from their refractive-index increment and light-scattering intensity

1981 ◽  
Vol 197 (3) ◽  
pp. 689-693 ◽  
Author(s):  
Paul Nieuwenhuysen ◽  
Frank De Voeght ◽  
Julius Clauwaert
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Light Scattering ◽  
Brine Shrimp ◽  
Artemia Salina ◽  
Refractive Index Increment ◽  
Scattering Intensity ◽  
A Value ◽  
Light Scattering Intensity ◽  
Cytoplasmic Ribosomes

Cytoplasmic ribosomes were isolated from the cryptobiotic embryos of the brine shrimp Artemia salina. Measurements of their refractive-index increments and light-scattering intensities give a value for their molecular weight of (3.4±0.2)×106.

LIGHT-SCATTERING STUDIES OF COPOLYMERS: I. EFFECT OF HETEROGENEITY OF CHAIN COMPOSITION ON THE MOLECULAR WEIGHT

1958 ◽  
Vol 36 (12) ◽  
pp. 1616-1626 ◽  
Author(s):  
W. Bushuk ◽  
H. Benoit
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Light Scattering ◽  
Average Molecular Weight ◽  
Apparent Molecular Weight ◽  
Scattering Data ◽  
Refractive Index Increment ◽  
Molecular Weights ◽  
Chain Composition ◽  
Total Molecular Weight

The classical light-scattering theory for polymer solutions is extended to solutions of copolymers which may be polydisperse in chain composition as well as in molecular weight. It is shown that much too high molecular weights will result from light-scattering data for copolymers owing to fluctuations in chain composition; the magnitude of this effect increases rapidly as the absolute value of the refractive index increment approaches zero. The methods for determining the usual weight-average molecular weight and polydispersity of composition are described.The theory was tested with experimental results on: (1) a mixture of polystyrene and poly(methylmethacrylate), considered as a copolymer with the highest possible polydispersity of composition; (2) a high conversion, statistical copolymer of styrene and methylmethacrylate (copolymer I); and (3) a block copolymer of the same monomers (copolymer II). The apparent molecular weight for copolymer I (Mw = 1.83 × 105) varied markedly with refractive index increment in much the same way as the total molecular weight for the mixture. The molecular weight of copolymer II (Mw = 1.20 × 106) remained essentially constant in the same series of solvents. The polydispersities of composition obtained were 0.72 and 0.05 for copolymer I and II respectively compared with the maximum possible value equal to 1.0.

Effect of small refractive index increment on light scattering molecular weight

1954 ◽  
Vol 14 (75) ◽  
pp. 310-312 ◽  
Author(s):  
Robert Tremblay ◽  
Yvon Sicotte ◽  
Marcel Rinfret
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Light Scattering ◽  
Refractive Index Increment

Light Scattering Intensity Fluctuations in Microdroplets Containing Inclusions.

1997 ◽  
Author(s):  
Gorden Videen ◽  
Paul Pellegrino ◽  
Dat Ngo ◽  
John S. Videen ◽  
Ronald G. Pinnick
Keyword(s):  
Light Scattering ◽  
Scattering Intensity ◽  
Light Scattering Intensity ◽  
Intensity Fluctuations
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