Quincke

First paper on metal carbonyls Ni(CO)4 by L. Mond, C. Langer and F. Quincke,... 

In 1861, Georg Hermann Quincke described a phenomenon that is the converse of electroosmosis When an electrolyte solution is forced through a porous diaphragm by means of an external hydrostatic pressure P (Fig. 31.1ft), a potential difference called the streaming potential arises between indicator electrodes placed on different sides of the diaphragm. Exactly in the same sense, in 1880, Friedrich Ernst Dorn described a phenomenon that is the converse of electrophoresis During... 

Since water as solvent plays the role of a medium where electrolytic displacements take place we shall be able to state for sure, together with Wiedemann, Beetz and Quincke, that the electrical resistance of a solution consists of resistances to movement enforced upon the components of the solution by water particles, by the components themselves and perhaps by the undecomposed molecules of the electrolyte. To separate these various hindrances will be no easy task, particularly because, as stressed by Quincke, they are not necessarily constant but can, for example, depend on the condition of the solution. Even from this standpoint the process of conduction will be, in general, still very complicated. 

It would therefore be of obvious importance to study the electrical behaviour of a surface liquid-air, since in that case we can determine changes in surface tension directly. Such experiments were already carried out by Quincke, who examined under the microscope the travel of a small air bubble in capillary filled with liquid, in an electric field. The method is therefore substantially cataphoresis, but has the drawback that there is only a minute thickness of liquid between the air surface and the glass wall, and that the portion of liquid film adjacent to the latter also travels in the electric field. Quincke found that air bubbles in water were negatively... 

A relation between rupture phenomena and (specific) surface energy 7 was postulated by Dupre 4 almost simultaneously with the hypothesis of Quincke. Let a cylindrical rod be broken in tension. After rupture, two new gas — solid interfaces of vr2 each are present, r being the radius of the rupture surface. Consequently, the work of rupture ought to contain a term 2 nr2 7 . Dupre did not indicate how to separate this term from the main component of the work of rupture, which is the work required to extend the rod to its maximum elongation (or strain). The modern development of Dupre s ideas is reviewed in Section III.3. below. 

G. Quincke Ueber Emulsionbildung Und Den Einfluss Der Galle Bei Der Ver-dauung. Plilger Arch. Physiol. 19, 129 (1879). 

G. Quincke Ueber Periodische Ausbreitung an Elussigkeitsoberflachen Und Dadurch Hervorgerufene Bewegungserscheinungen. Wiedemanss Annalen der Physik und Chemie. Neue Eolge 35, 580 (1888). 

Again the case of two parallel plates dipping vertically or inclined at a slight angle at a short distance apart in the liquid closely resembles that of the capillary tube and has been used by Quincke and Volkmann. 

On forcing a liquid through a diaphragm, diaphragm currents are set up, a phenomenon noted by Wiedemann and Quincke and one hilly accounted for on the hypothesis of the existence of an electrical double lay er between the diaphragm material and the liquid. 

Fluorination of corticosteroids at C-9 or/and C-6 increases glucocorticoid activity, while mineralocorticoid activity, responsible for sodium retention (the main adverse effect of corticoids), is decreased (cf. Chapter 4). Fluorocorticoster-oids were the first fluorinated compounds to be used clinically. They are still major drugs against many inflammatory disorders rheumatoid polyarthritis, ORL (asthma, rhinitis), brain edema, dermatological, allergies, anaphylactic shock, Quincke s edema). 

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