Read e-book online Ion-Selective Microelectrodes: Principles, Design and PDF

By Daniel Ammann

ISBN-10: 3540162224

ISBN-13: 9783540162223

ISBN-10: 3642525075

ISBN-13: 9783642525070

The microelectrode procedure is at the present time the main typical process in electrophy siology. Microelectrodes supply a special method of measurements of electric pa rameters and ion actions of unmarried cells. a number of vital breakthroughs in trans port body structure have arisen from microelectrode stories. absolutely, there's a steadily general use of traditional and ion-selective microelectrodes. because of their specific measurement and houses micro electrodes are specific ly utilized to measurements on dwelling topic. This should have many effects to my techniques on experiments with microelectrodes. during this booklet, my problem is fo cussing at the description of an intracellular technique that are supposed to bring about trustworthy in formation on mobile parameters. The methodical foundation for any significant applica tion is handled greatly. in spite of the fact that, technical perfection and exact effects aren't the one quandary while engaged on animals and humans. particularly, my techniques are ruled by means of the highbrow and ethical mastery of the experimental ap proach on dwelling matters. A dimension with microelectrodes frequently necessitates the sacrifice of an ani mal. this is often an important truth, and signifies that the information received by means of the experi ment needs to justify the dying of a residing topic.

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Extra resources for Ion-Selective Microelectrodes: Principles, Design and Application

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G. amines, carboxylic groups) the membrane solvents can be chosen so that H + or OH - ions cause no interference and they do not act as disturbing ion-exchanger sites. Little is known about the toxicity of membrane solvents. Remarkably high concentrations of plasticizers (which are also used in membrane electrodes or are structurally related to membrane solvents) have been found in the blood of patients undergoing hemodialysis treatment [Lewis et al. 78] or cardiac bypass surgery. For example, during a five hour dialysis session patients can receive up to 150 mg of the PVC-plasticizer bis (2-ethyl-hexyl) phthalate [Biggs and Robson 82].

0----- ,, \ ........ 9. Theoretically (left) and experimentally (right) observed influence of the average thickness s of a ligand layer about a metal cation on the ion selectivity of carrier membrane electrodes. Left: free energy of the electrostatic interactions between a cationic complex and the membrane solvent. The free energies L1G s (see Eq. 1») are estimated for two metal ions of nearly the same size (Na +, Ca 2 +) but of different charge, for two values of the ligand layer thickness (s), and for a varying dielectric constant of the membrane solvent [Morf et al.

A great deal of work is still necessary before ion selectivities can be reliably estimated in this way. It has to be kept in mind that interaction energies, not free energies, are calculated. In principal, the computation of free energies should be possible using molecular dynamics [Alder and Wainwright 59]. Furthermore, the conformational energies of the ligands should be taken into consideration. This can be achieved by using the techniques of molecular mechanics [Burkert and Allinger 82], but the precision is limited.

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Ion-Selective Microelectrodes: Principles, Design and Application by Daniel Ammann

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