Halophiles require a high salt concentration for growth.

Most bacteria, however, do not possess these physiological adaptations and cannot tolerate high

Bacterial production of catalase can be demon­strated by adding a loopful of a microbial culture to a 3% solution of hydrogen peroxide. The evolution of gas bubbles, oxygen, is evidence of the action of the catalase (FIG. 10-14).

TABLE 10-3

FIG. 10-15 The halophiles require sodium chloride (NaCl) for growth. Marine bacteria typically grow best near 3% NaCl. Some extreme halophiles grow best near 15% NaCl.

304 CHAPTER 10 BACTERIAL REPRODUCTION AND GROWTH OF MICROORGANISMS

FIG. 10-16 Halophiles growing within salt lakes often turn the water pink; this some­times occurs in Great Salt Lake, Utah.

FIG. 10-17 pH scale showing pH values of some common substances.

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