A magnetic viscometer for shear-sensitive macromolecules

Brust, Rüdiger; Muth, Volker

doi:10.1016/0165-022x(84)90027-7

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…[9][10][11]14 The period of rotation was measured by the operator or by an electro-optical system. 12,14 The temperature was stabilized by water circulating around the measuring cell. 9-14 a͒ Author to whom correspondence should be addressed; electronic mail: bano@saske.sk The above constructions have not achieved a wider application since each of them had some disadvantage.…”

Section: Introductionmentioning

confidence: 99%

“…In these constructions, the rotor was stabilized in the vertical direction by surface tension, 8 electromagnetic force, [9][10][11][12] or by the change of volumes caused by an pressure change in the measuring cell. 13,14 Surface tension, 8 electromagnetic forces, [10][11][12]14 or hydrodynamic forces 13 were used for rotor centering. Rotating a magnetic field around it drove the conducting rotor.…”

Section: Introductionmentioning

confidence: 99%

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A viscosity and density meter with a magnetically suspended rotor

Bánó

Strharsky

Hrmo

2003

Review of Scientific Instruments

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A device for measuring the viscosity and density of liquids is presented. It is a Couette-type viscometer that uses a submerged rotor to measure the viscosity without errors originating in the contact of the rotor with the sample/air boundary. The inner cylinder is a glass rotor suspended in the liquid, and the outer cylinder is also made of glass. The rotor is stabilized on the axis of the outer cylinder by an electromagnetic force controlled by feedback from the rotor's vertical position. In the lower part of the rotor is an aluminum cylinder located in a magnetic field generated by rotating permanent magnets. The interaction of this rotating magnetic field with eddy currents generated in the aluminum cylinder causes rotation of the rotor. This rotation is optically detected, and viscosity is calculated from the measured angular velocity of rotor. The density of the liquid is calculated from the applied vertical equilibrating force. A computer controls the whole measurement. The device works at constant temperature or while scanning temperature. The sample volume is 1.6 ml, and the accuracy of measurement of both viscosity and density is ϳ0.1%. The range of measured densities is ͑0.7-1.4͒ g/ml, and viscosity can be measured in the range (3ϫ10 Ϫ4 -0.3) Pa s. The shear rate of the viscosity measurement varies in the range ͑20-300͒ s Ϫ1 . The accuracy of the temperature measurement is 0.02 K.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A viscosity and density meter with a magnetically suspended rotor

Bánó

Strharsky

Hrmo

2003

Review of Scientific Instruments

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Viscosity of chromatin solutions increases with increasing ionic strength

Brust

1986

Mol Biol Rep

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Increasing the ionic strength of rat liver chromatin solutions above 0.4 M causes increasing viscosity. This indicates transformation of the compact chromatin molecules to more elongated forms. In the range of 0.4-0.5 M ionic strength histone H1 is dissociating continuously from the chromatin and the quaternary structure chromatin unravels. At ionic strength higher than 0.5 M the viscosities of chromatin solutions are furthermore increasing due to structural deformation. Near 0.7 M ionic strength the core histones H2A and H2B begin to dissociate from the chromatin, and the opening of the nucleosome cores leads to increasing elongation of the chromatin molecules.

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Viscosity as an additional physico-chemical parameter for studying chromatin structure

Brust

1985

Mol Biol Rep

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A magnetic viscometer for shear-sensitive macromolecules

Cited by 3 publications

References 14 publications

A viscosity and density meter with a magnetically suspended rotor

A viscosity and density meter with a magnetically suspended rotor

Viscosity of chromatin solutions increases with increasing ionic strength

Viscosity as an additional physico-chemical parameter for studying chromatin structure

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