[16] It will be noted that the names of enzymes (except some of those first discovered) terminate in ase which is usually added to the stem of the name of the substance acted on, though sometimes to a word which indicates the substance formed by the action, as lactacidase, alcoholase. [↩]
[17] Tetanus toxin is about 120 times as poisonous as strychnin, both of which act on the same kind of nerve cells. [↩]
[18] In the author’s laboratory in the past ten years all sterilization except those few objects in blood and serum work which must be dry, has been done in autoclaves of the type shown in [Fig. 81] which are supplied with steam from the University central heating plant. A very great saving of time is thus secured. [↩]
[19] The author has tested an “electric milk purifier” ([Fig. 102]) which was as efficient as a first-class pasteurizer and left the milk in excellent condition both chemically and as far as “cream line” was concerned. The cost of operation as compared with steam will depend on the price of electricity. [↩]
[20] The exact laboratory details for preparing various media are not given in this chapter. It is the object to explain the choice of different materials and the reasons for the various processes to which they are subjected. [↩]
[21] For a discussion of this method of standardization consult the following:
- Clark & Lubs—J. Bact., 1917, II, 1–34, 109–136, 191–236.
- Committee Report—Ibid., 1919. IV, 107–132.
- Jones—J. Inf. Dis., 1919, 25, 262–268.
- Fennel & Fisher—Ibid., 444–451.
Additional references will be found in these articles. [↩]
[22] Term also applied to the solidification of serum in media: e.g., the Hiss inulin medium for the differentiation of pneumococci (see [diplococcus of pneumonia]). [↩]
[23] The term “antigen” is also used to designate substances which may take the place of what are supposed to be the true antigens in certain diagnostic reactions (Chapter XXIX, [Complement Fixation Test] for Syphilis). [↩]