. Elements of human physiology. Physiology. 34 PHYSIOLOGY twenty-four hours with pancreatic juice. When the Hquid is allowed to cool, crystals of tyrosine separate out. These crystals form slender needles arranged in sheaves or radiating from a centre. The mother-liquor is evaporated to a syrupy consistence, extracted with alcohol, and the extract allowed to stand. As the alcohol evaporates, yellowish-brown spheres, consisting of masses of ill-formed needle-shaped crystals of leucine, separate out. A solution of tyrosine with Millon's reagent gives a red colour, the tmt of which deepens on hea
. Elements of human physiology. Physiology. 34 PHYSIOLOGY twenty-four hours with pancreatic juice. When the Hquid is allowed to cool, crystals of tyrosine separate out. These crystals form slender needles arranged in sheaves or radiating from a centre. The mother-liquor is evaporated to a syrupy consistence, extracted with alcohol, and the extract allowed to stand. As the alcohol evaporates, yellowish-brown spheres, consisting of masses of ill-formed needle-shaped crystals of leucine, separate out. A solution of tyrosine with Millon's reagent gives a red colour, the tmt of which deepens on heatmg. When proteins are hydrolysed by means of trypsine, the proteolytic ferment of pancreatic juice, the digest at a certain period gives a rose colour on acidification and addition of bromine water. This reaction is due to the presence of another aromatic body, called tryptophane, which is a derivative of indol, being indol amino-propionic acid. ,.CHNH ,.COOH C,H, CH \ y NH Acted on by bacteria of putrefaction this body gives rise to indol and skatol, substances with a pronounced faecal odour and constantly produced in the putrefaction of proteins. Fig. 13. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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