Grundlagen der Atomphysik

Bauer, Hans Adolf

doi:10.1007/978-3-7091-3214-2

Cited by 2 publications

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“…These were determined with a Hilger-Rayleigh interference refractometer using Bauer's (1945) technique for monochromatic light. The instrument was checked using sodium chloride solutions as standards.…”

Section: Specific Refractive Index Increments (Dnldc)mentioning

confidence: 99%

Micelle Formation by Lecithin in Some Aliphatic Alcohols

Elworthy

McIntosh

1961

Journal of Pharmacy and Pharmacology

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Lecithin has been studied in methanol, ethanol, butanol, and hexanol using light scattering and viscosity techniques. A new type of light scattering cell was employed. Micelles were present in all solvents, the micellar weights being 2,300; 7,100; 18,000, and 22,000 in the four alcohols respectively. It appeared that as the polarity of the solvent decreased, the micellar size increased. Dissymmetry measurements showed that no dimension of the micelles exceeded 270A (A/20), but high observed depolarisations showed that the particles were anisotropic. Viscosity measurements also gave an idea of the shape of the micelles, giving intercepts of plots of specific viscosity/solute volume fraction against solute volume fraction of 4.29, 4.26, 4-26, and 3.56 for the four alcohols respectively. Using the dimensions of the lecithin molecule, and the number of monomers present in the micelle, calculations of the theoretical viscosity intercept have been made for each solvent, and compared with values obtained experimentally.MICELLE formation by lecithin in benzene has been studied (Elworthy, 1959) using osmotic pressure, diffusion, and viscosity measurements. The micelles had a laminar structure with the phosphorylcholine head groups situated in the centre of the micelle, and the hydrocarbon chains extending outwards into the solvent. The micellar weight was 57,000. There are presumably repulsive forces between the polar head groups and the solvent, giving a reversal of the type of micelle structure found in water, in which the hydrocarbon chains form the interior of the micelle, and the polar groups are on the outside.As a continuation of the study of micelle formation by lecithin in organic solvents, it was decided to study lecithin in solvents which should provide intermediate conditions between water and benzene.

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Section: Specific Refractive Index Increments (Dnldc)mentioning

confidence: 99%

Micelle Formation by Lecithin in Some Aliphatic Alcohols

Elworthy

McIntosh

1961

Journal of Pharmacy and Pharmacology

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“…The great miracle of this potential energy is fully recognized as far as the fetal development is concerned, but the miracle is not over with the moment of birth. 26 Bauer had emigrated via France to the United States after the German annexation of Austria in 1938. 27 Bauer hoped that constitutional medicine could be connected to current work being done in the United States with breeding and experimental genetics.…”

Section: The Historical Confluences Of Heredity and Medicinementioning

confidence: 99%

Tracing the shifting sands of ‘medical genetics’: what’s in a name?

Leeming

2010

Studies in History and Philosophy of Science Part C: Studies in

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Grundlagen der Atomphysik

Cited by 2 publications

References 0 publications

Micelle Formation by Lecithin in Some Aliphatic Alcohols

Micelle Formation by Lecithin in Some Aliphatic Alcohols

Tracing the shifting sands of ‘medical genetics’: what’s in a name?

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