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By M. L.; Edsall, John T. (Eds) Anson

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Critical Phenomena in Loop Models

Whilst with reference to a continual section transition, many actual platforms can usefully be mapped to ensembles of fluctuating loops, which would symbolize for instance polymer jewelry, or line defects in a lattice magnet, or worldlines of quantum debris. 'Loop versions' offer a unifying geometric language for difficulties of this type.

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Was applied between a corrodible anode (Zn,Fe or Al) and an iron cathode. The membranes were of canvas impregnated with gelatin which was subsequently rendered insoluble with formaldehyde. The hydrolysis of the protein was performed with &so4 which was removed as CaSO, and BaSO4 before ionophoresis. This method of using a soluble anode avoids most of the troubles such as change of pH, liberation of chlorine and destruction at the anode that render the ordinary 3-compartment cell method only of value for the basic fraction.

To be difficult to precipitate completely by phosphotungstic acid (326,327). It would be interesting to know what its behavior is in the presence of other basic amino acids. Proline phosphotungstate is somewhat insoluble, and has been used (328) for purifying proline. FEavianic Acid This acid has been employed for precipitating arginine with considerable success. It was introduced by Kossel and Gross (329; cf. 330), who also studied the properties of the flavianates of a number of other bases. It has found widespread use as an almost quantitative precipitant of arginine from complete protein hydrolyzates as its monoflavianate, and in the later stages of determining arginine by other methods.

MARTIN AND R. L. M. SYNGE valuable analytical technique particularly in connection with the determination of glutamic and aspartic acids. What implications the finding of contaminants in the precipitate has for the quantit,ative cystine and methionine methods mentioned above is uncertain, since cupric copper is present under the Lucas-Bailey conditions and may be responsible for the contamination. Silver, Mercury, and Cadmium Compounds Precipitation with silver compounds was employed in the early studies which led to the discovery of the basic amino acids (380).

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