. Biological order. Biology. vegetative phase. •\AAAphQge ^ phage proteins X repressor Figure 31. The Fate of the Infected Bacterium. The nonlysogenic bacterium is infected: 1-3: at low temperature (20°C.) in the presence of chloramphenicol, or in bacteria deprived of food, the first activity of the genetic material of the repressor. As a consequence the synthesis of phage protein is repressed, the vegetative phase is not initiated, and the genetic material of the phage reaches its chromosomal locus and becomes a prophage. 4-5: at high temperature (40°C.), or in a bacterium irradiated w
. Biological order. Biology. vegetative phase. •\AAAphQge ^ phage proteins X repressor Figure 31. The Fate of the Infected Bacterium. The nonlysogenic bacterium is infected: 1-3: at low temperature (20°C.) in the presence of chloramphenicol, or in bacteria deprived of food, the first activity of the genetic material of the repressor. As a consequence the synthesis of phage protein is repressed, the vegetative phase is not initiated, and the genetic material of the phage reaches its chromosomal locus and becomes a prophage. 4-5: at high temperature (40°C.), or in a bacterium irradiated with ultra- violet rays. The first activity of the genetic material of the phage is the synthesis of a protein. The vegetative phase is initiated, and infectious particles are produced. with ultraviolet light, although all other characters of the mutant were the same as those of the original strain. The mutant not induci- ble with ultraviolet light is, however, sensitive to zygotic indu<iition. Double lysogenic strains can be obtained that carry two prophages A: [76]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lwoff, André, 1902-. Cambridge, M. I. T. Press
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