Dictionary of Chemical Terms

Dictionary of Chemical Terms

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...fats and is of value in testing its purity. (A Hehner solution is used in determining the iodine number of oils.) Helide. A compound of helium and some other element. It is alleged that the radioactive elements are helides since they continuously give off helium and the idea is extended to include all the elements. It is stated that very probably nitrogen is a complex of three helium atoms and two hydrogen atoms. Heliotaxis. iThe phenomenon of Heliotropism. / a plant, flower, or leaf turning or growing toward the sun. Such structures are termed heliotropic. Cf. Chemotaxis and geotropism. Helium. Gaseous element. He. At. Wt. 4.00 S. G. 1.98 (H = 1). M. P.-270. B. P.-268.7. Forms no known compounds in the ordinary sense (cf. helide). 1,000 vols of air HEMICELLULOSES 96 HEXOSES contain 0.0014 vo'-Formed in the degradation of radium. Hemicelluloses. Cell-wall constituents related to cellulose. They dissolve when heated with very dilute mineral acids and yield, on hydrolysis, arabinose, xylose, galactose, and mannose. Hemihedrity. A crystal phenomenon. Sometimes only half of the identical parts are modified at the same time and in the same manner. Thus a cube ought to be truncated at the same time on its eight solid angles, but in certain cases it is only truncated in four, as in boracite. (Pasteur.) Such forms are termed hemihedral. Hemipeptone. A product of the tryptic digestion of protein as distinguished from antipeptone. On further digestion it yields amino acids and other products while antipeptone is not attacked. Hemiterpenes. A class of terpenes of the formula C-H3, e.g. isoprene. Hemitrope. A twin crystal. Hemoglobins. (Chromoproteins.) See proteins. Hemolysins. See haemolysins. Hemolysis. See haemolysis. Henry....
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Product details

  • Paperback | 94 pages
  • 189 x 246 x 5mm | 181g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236635825
  • 9781236635822