Practical bacteriology for chemical students / by David Ellis.

  • David Ellis
Date:
1923
Catalogue details

Licence: In copyright

Credit: Practical bacteriology for chemical students / by David Ellis. Source: Wellcome Collection.

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    tion. N Suppose -g- c.c. of — *NaOH was necessary for neutralisa- N Hence f c.c. of NaOH neutralises i c.c. prune juice. Hence ioo c.c. would require ioo io 0 N — NaOH io N — NaOH. i If N 1000 c.c. —NaOH i grams HC1 Then V 1 IO ~6~ requires '0365 gram HC1 •061 V Hence acidity = ’o61 °/0 IdCl. If experiments are made with other moulds, care must be taken that the conditions are the same throughout the whole series of experiments. Place the nutrient medium in the same kind of flask, incubate at the same temperature, and employ the same volume of nutrient fluid in each case. Exercise 108. Infection of fruit with a Moidd. 1. Clean the surfaces of a tomato, a grape and a plum. 2. Place each in a deep sterile Petri-dish. 3. Pour a thin layer of water on bottom of each Petri-dish. 4. Lift a tiny bit of a mould with a needle and stab with it each of the three fruits. 5. Set aside preferably in a warm place under a suitable covering. 6. Examine after a few days and ascertain whether the hyphae and spores that have developed are identical in shape, size etc. with the mould with which the fruits, were infected.