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Biomedical subjects

J Heinrich

Publications and source records attributed to J Heinrich.

At least 307 records · Page 17Linked to original sources
PubMed1969

[Cardiotocography].

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Arrhythmias, Cardiac↗
PubMedDate not supplied

High speed electrophoresis simulation for optimization of continuous flow electrophoresis and high performance capillary techniques: Part I. Computer model.

A computer program for high-speed simulation and optimization of electrophoretic processes has been developed for carrier-free systems of all kinds. The calculations are based on the one-dimensional dynamic (transient-state) model. The three-dimensional geometry of the simulation space can be chosen deliberately. With a highly efficient transport algorithm instead of complicated integration schemes for the transport equations, the calculation time can be effectively spent on various important parameters such as ionic strength, temperature, Joule heat, activity coefficients and concentration changes due to membranes. The parameter set of any carrier free electrophoretic method (i.e., continuous-flow electrophoresis, capillary isotachophoresis and high performance capillary zone electrophoresis) can be imported directly into the computer program by means of a graphic user interface. The program performs overnight-simulation of any electrophoretic system containing up to 15 components.

Computer Simulation↗
PubMedDate not supplied

Influence of the electrode compartment separating membranes on continuous flow electrophoresis.

The influence of the ion permeable diaphragms, separating the electrode compartments of continuous flow electrophoresis chambers from the separation space, are described in detail. A set of equations is derived from a simplified phenomenological model of the ion transport across media boundaries. These equations are useful to predict the magnitude of concentration changes near the membranes due to the electrophoretic ion transport. Adaption to any CFE geometry, membrane material and electrolyte system is possible with only a few measurements, which yield the transference number difference as a characteristic transport property of the membrane material for a special electrolyte. The validity of the equations is checked by experiments. Local electric field strength and local conductivity are measured with a potential gradient-conductivity scanner developed in our laboratory. This device yields data on the dynamics of the concentration changes.

Electrodes↗