scholarly journals Viscosity and diffusion: crowding and salt effects in protein solutions

Soft Matter ◽  
2012 ◽  
Vol 8 (5) ◽  
pp. 1404-1419 ◽  
Author(s):  
Marco Heinen ◽  
Fabio Zanini ◽  
Felix Roosen-Runge ◽  
Diana Fedunová ◽  
Fajun Zhang ◽  
...  
Keyword(s):  
Protein Solutions ◽  
Salt Effects ◽  
And Diffusion

Competing Salt Effects on Phase Behavior of Protein Solutions: Tailoring of Protein Interaction by the Binding of Multivalent Ions and Charge Screening

2014 ◽  
Vol 118 (38) ◽  
pp. 11365-11374 ◽  
Author(s):  
Elena Jordan ◽  
Felix Roosen-Runge ◽  
Sara Leibfarth ◽  
Fajun Zhang ◽  
Michael Sztucki ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Protein Interaction ◽  
Protein Solutions ◽  
Salt Effects ◽  
Charge Screening ◽  
Multivalent Ions

scholarly journals The scattering of light in protein solutions. I—Gelatin solutions and gels

1930 ◽  
Vol 129 (811) ◽  
pp. 490-508 ◽  
Keyword(s):  
Analytical Data ◽  
Sedimentation Velocity ◽  
Sedimentation Equilibrium ◽  
Protein Solutions ◽  
Scattering Of Light ◽  
Molecular Weights ◽  
Protein Molecules ◽  
Long Time ◽  
And Diffusion

In a previous paper, the investigation of the scattering of light in agar sols and gels was described and a view regarding the changes taking place in the system during gelation was developed. In a series of paper, of which this is the first, the author proposes to publish investigations of the scattering of light in protein solutions. The various physical properties of the different proteins have been studied for a long time past. Several workers have tried to evaluate the molecular weights of the proteins from the osmotic pressure of their solutions and also from analytical data. Recently a very precise and definite method for the determination of the molecular weights of the proteins, based upon the sedimentation of these heavy molecules in the ultra-centrifuge, has been successfully developed by Svedberg. The molecular weight can be determined in two ways:—(I) by the measurement of the sedimentation equilibrium reached in the cell as a result of the centrifugal and diffusion forces; (II) by measuring the sedimentation velocity of the protein molecules in high centrifugal fields.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

Characterization of frozen hydrated biological specimens by low-loss EELS

1992 ◽  
Vol 50 (2) ◽  
pp. 1572-1573
Author(s):  
Songquan Sun ◽  
Richard D. Leapman
Keyword(s):  
Water Content ◽  
Direct Method ◽  
Internal Standard ◽  
Dry Weight ◽  
Dark Field ◽  
Protein Solutions ◽  
Subcellular Compartment ◽  
Differential Shrinkage ◽  
Electron Energy Loss

Analyses of ultrathin cryosections are generally performed after freeze-drying because the presence of water renders the specimens highly susceptible to radiation damage. The water content of a subcellular compartment is an important quantity that must be known, for example, to convert the dry weight concentrations of ions to the physiologically more relevant molar concentrations. Water content can be determined indirectly from dark-field mass measurements provided that there is no differential shrinkage between compartments and that there exists a suitable internal standard. The potential advantage of a more direct method for measuring water has led us to explore the use of electron energy loss spectroscopy (EELS) for characterizing biological specimens in their frozen hydrated state.We have obtained preliminary EELS measurements from pure amorphous ice and from cryosectioned frozen protein solutions. The specimens were cryotransfered into a VG-HB501 field-emission STEM equipped with a 666 Gatan parallel-detection spectrometer and analyzed at approximately −160 C.

Ordering and diffusion in II-VI/III-VI alloys with structural vacancies

1997 ◽  
Vol 101-103 (1-2) ◽  
pp. 479-487
Author(s):  
H v. Wensierski
Keyword(s):  
And Diffusion
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