Antibiotics - download pdf or read online

By John H. Hash

ISBN-10: 0121819434

ISBN-13: 9780121819439

The significantly acclaimed laboratory ordinary, equipment in Enzymology, is likely one of the so much hugely revered courses within the box of biochemistry. on the grounds that 1955, every one quantity has been eagerly awaited, often consulted, and praised by way of researchers and reviewers alike. The sequence includes a lot fabric nonetheless correct this day - really an important booklet for researchers in all fields of existence sciences.

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Sample text

Incubation at 37 ° is then continued and the resistant clones picked and scored for necessary auxotrophic and resistance markers. Transduction with Phage P22 in S. typhimurium Preparation o] Phage Stock. I ml of this culture is diluted into 1 ml of rich broth and incubated at 37 ° for 2 hr. To this 10 ml of culture (approximately l0 s cells/ml) is added 107 particles of phage P22 and vigorous incubation is continued for 5-8 hr until the broth begins to clear slightly. Centrifuge the cultures at low speed, remove the supernatant, and centrifuge the supernatant in a Spinco Model L ultracentrifuge at 30,000 g for 1 hr (40 rotor).

What may be considered a classic in this field is the work of Backus and Stauffer1 with Penicillium chrysogenum at the University of Wisconsin. This paper is important not only because it reports an increase in penicillin yields 40 times greater than those produced by the parent culture, but primarily because it presents an overall view of the techniques and approach followed over a 10-year period. II. Fermentation Conditions These will not be discussed in any detail here; suffice it to say that with a mutation program a parallel study should be initiated to develop satisfactory fermentation conditions.

II. Genetic Transfer of Resistance Plasmids . . . . A. Conjugation . . . . . . . . B. Transduction . . . . . . . . C. Transformation . . . . . . . III. Enhanced Segregation of Resistance Plasmids by Curing Agents A. Acridine Orange, Quinacrine, and Ethidium Bromide Curing B. Sodium Dodecyl Sulfate . . . . . . C. Mitomycin . . . . . . . . IV. Compatibility Properties of R Plasmids . . . . A. Determination of fi Character . . . . .

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Antibiotics by John H. Hash


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