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Flocs are observed only in a minimal aerobic medium. (A, C to E) Photographs of Z. mobilis ZM4 cultures in test tubes either with a minimal medium (ZYMM) or with the undefined, rich PYG medium. Media were swirled by hand before photographs were taken. The yellow arrow in panel A points to a macroscopic floc. (B) Scanning electron micrograph of a floc grown in aerobic ZYMM with NH4Cl. Magnification, ×1,000 at 15 kV.
