Directions for a practical course in chemical physiology / W. Cramer.

  • Cramer, William, 1878-1945.
Date:
1920
Catalogue details

Licence: In copyright

Credit: Directions for a practical course in chemical physiology / W. Cramer. Source: Wellcome Collection.

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    iodine has acted. Record your result. Garry out the test with AA, AAA, and B. Record your results. The colour is very faint in AA and AAA, and may even be absent. Why ] It is absent in B. Why ? Why must the tissues be preserved in alcohol and not in a watery solution (of formalin, for instance), if one wishes to test for glycogen 1 Experiment 56. Test for Iron.—To a test tube con- taining 10 c.c. of water add a few drops of ferric chloride. To this ferric chloride solution add a few drops of potassium ferrocyanide. A blue colour results. What has been formed ? Explain the reaction which has taken place in the form of a chemical equation. Experiment 57. Iron in Liver.—Keep a piece of liver in a potassium ferrocyanide solution for a few minutes. Then add some dilute HC1 (0-5 per cent.). A faint blue colour appears. Carry out the same experiment with a piece of kidney or any other tissue. Record the results. Experiment 58.—Apply the same test to a piece of liver from a case of pernicious anaemia, in which there is an excessive destruction of red blood corpuscles. A distinct blue colour appears. Explain the results. NERVOUS TISSUE® Nervous tissue differs from other tissues in being particularly rich in lipoids, i.e., substances soluble in fat- solvents, such as ether, alcohol, chloroform, and insoluble in water. In order to extract lipoids from tissues it is best to dry the tissues first. This is done by finely mincing the tissue, sprinkling it with formalin in order to avoid putrefaction, and, after removing the bulk of the