Elements of human physiology / by L. Hermann ; translated from the sixth edition by Arthur Gamgee.

  • Gamgee Arthur, 1841-1909.
Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: Elements of human physiology / by L. Hermann ; translated from the sixth edition by Arthur Gamgee. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    14. TauHne, amido-ethyl-sulphonic acid, S02(OH)(C2H4.H2N) 0—0 O—OH H 0—OH H H * \/ \/ I I \/ I I I H—0-S-O-H H—0—&-6-C—H H—0-S—C-C-N-H u u SO,(OH), S02(OH)(02H5) SO,(0H)(02H4.H,N) Sulphuric acid Ethylsulphonic acid Amido-ethyl-sulphonic acid or Taurine This body occurs in the bile as a compound of cholic acid, similar to that of glycocine, viz. as Taurocholic acid (Ca^H^gNSOy); it is also present in a free condition in some glands. 15. Tyrosine, CgHj^NOg, is an amido-acid, whose constitution is not yet known, but which contains as its basis an aromatic residue ; it is generally found in small quantities accompanying leucine. Like leucine, it is an ingredient of glandular organs, and is a product of the digestion and decomposition of proteids ; it also occurs in the urine in cases of acute yellow atrophy. Wlien heated with mercuric nitrate, in presence of some nitrous acid, tyrosine jields a red coloration. d. Amido acids, in which the hydrogen of the ammoniacal residue is itself substituted. 16. Sarcosine, methyl-amido-acetic acid or methj'l-glycocine, 0,H2(NH[CH3])O.OH, is obtained when creatine is treated with alkalies, or synthetically hy the action ■of methylamine on chloracetic acid (refer to p. 39 for the synthesis of Glycocine). It is an isomer of alanine. HHHO HHHO 1 I I II I I I II „ H—N—C—C—0-0—H H—0—N-C—C-O-H H H H H Alanine Sarcosine 17. Creatine, methyl-guanidine-acetic acid, C4H9N3O2, is a •constituent of the blood, the muscles, the brain, &c. H H hiIhh hnhhho L <l I I I II I I I II H—N—c—6—n-h h—n—c—c-n—c—c—o—h Methyl-guanidine Methyl-guanidine-acetic acid (Creatine) Creatine is obtained synthetically from cyanamide (CN.NHj), and sarcosine; -one can in the graphic formula of creatine easily recognise, on the left, the residue of cyanamide, and, on the right, that of urea. + H,0 = O3H7NO2 + OHAO- Actually, m-ea only diflfers from cyanamide in containing one molecule more * H H 0 H H-ll-CsN H-ilr-c-if-H Cyanamide Vrea,