Pfeiffer's r

See Pfeiffer. r. clump. The agglutination of bacilli by means of agglutinative serum, r., Ehrlich's, for diazo-bodies in urine; see in appendix, page 894. r. of degeneration. The electrical r. indicative of degenerative changes in a nerve. It consists in a rapid lo of the galvanic and faradic irritability of the muscles supplied by it, while the galvanic irritability of the muscles increases and remains exalted for a number of months (until muscular atrophy supervenes). During this condition the anodal closing contraction may be obtained with le than the cathodic closing contraction, contrary to the normal sequence, r. of stool, how to determine; see in appendix, page 907. r., Schmidt's, to determine presence of hydro bilirubin; see in appendix^ page 907, 908. r. time. The time which elapses between the conscious reception of a stimulus and the emi ion of a consequent motor response, reversible r's. Chemical r's which are reversible, depending upon various conditions, such as temperature, amounts of the various reagents used, etc. The best example is the esterification of acetic acid with ethyl alcohol, CH5.COOH + CH3.CH2OH"I^lCH3.COOCH2.CH3. + H2- O. By increasing the quantities of the substances on one side of the equation, we force the reaction to. the other side. Smith's r. See anaphylaxis, tryptophan r. The pink or purple color r. obtained by treating tryptophan in weak acetic acid with elementary bromin. The r. is not given when a hydrogen of the NH2 group is replaced by an amido-acid group, as in glycytryptophan. tuberculin r. The febrile response of a tuberculous subject to the injection of tuberculin, tuberculin skin r. The local inflammatory response when tuberculin is applied to the skin denuded of its epithelium in a tuberculous subject, von Pirquet's r. See under Pirquet. Wa ermann r. See Wa ermann. Widal's agglutination r. See Widal. xanthoproteic r. A reaction seen on adding strong nitric acid and then ammonia to a" solution containing characteristic orange color a results. proteid. A [Lat, reactio.~]