 persist in the matrix for some time before being assimilated by algae or other microbes or diffusing from the matrix. One-half of this maximum velocity is reached at a characteristic concentration of the permeant (or substrate in the case of an enzyme), termed the Michaelis parameter (Km), named for a pioneer of enzyme kinetics, Leonor Michaelis. 4.3), providing increased space for attachment by the microflora but decreased pore space. Movement through the gramicidin channel is thus consistent with a model in which one or (at most) two ions are present in the channel at any time, entering, diffusing through, and leaving it again by the random, statistical motions characteristic of all diffusion, as was seen in Chapter 2. For example, microchannels size is increased in the presence of high dissolved humic substances and ultraviolet irradiance (Wetzel et al., 1997, unpublished). 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The Praying Mantis’ are still hanging around my yard. Today I photographed 2, one hanging upside down on my car window (