Bacteriological techniques for dairy purposes.

  • Great Britain. Ministry of Agriculture, Fisheries and Food.
Date:
1968
Catalogue details

Licence: Public Domain Mark

Credit: Bacteriological techniques for dairy purposes. Source: Wellcome Collection.

    22/192 (page 14)
    12. Metal Caps Press caps for sample bottles, screw caps for McCartney bottles and loose fitting caps for test-tubes should be tested as for rubber closures (see para. II). 13. Petri Dishes Add to ml of sterile agar medium. 14. 9 ml Blanks (i) If the container has a cotton-wool plug this must be replaced by a sterile rubber closure as in para. 10 (6)(ii). (ii) Plate one quantity of 5 ml. 15. Ringer’s Solution (a) 500 ml quantities as used for can rinsing. (i) Plate one quantity of 5 ml. (b) 20 ml quantities as used for bottle rinsing. (i) Proceed as in para. 15§(a)(i). 16. Culture Media Take three tubes or bottles at random and incubate for 72+-2 hr at 30-+1:-0° followed by 48 hr at room temperature 15-22”. The report shall show the number of tubes positive in each batch of three. ©