. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 84 ALFRED M. ELLIOTT the aid of a Sedywick-Rafter counting chamber and a \\'hippie ocular micrometer. A LaMotte roulette comparator was employed in making pH determinations. so 60 40 20. IMC. 1. Scries I. Concentration of ciliates in thousands per cubic centimeter plotted against initial pH. The M>lid line indicates growth in the control; the broken line, growth with pantotlu nic acid. K X I'l- k i:MENTAL In testing the effect of any ioni/.ahlc sub>tance such as pantothenic acid, it is e
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 84 ALFRED M. ELLIOTT the aid of a Sedywick-Rafter counting chamber and a \\'hippie ocular micrometer. A LaMotte roulette comparator was employed in making pH determinations. so 60 40 20. IMC. 1. Scries I. Concentration of ciliates in thousands per cubic centimeter plotted against initial pH. The M>lid line indicates growth in the control; the broken line, growth with pantotlu nic acid. K X I'l- k i:MENTAL In testing the effect of any ioni/.ahlc sub>tance such as pantothenic acid, it is essential to determine its influence over a wide pH range, and not at the point of optimum growth alone of the organism. A sul> stance may have decidedly different effects in the ionized and molecular * V condition. This fact was well illustrated in the case of acetic and bu- tyric acirl CElliott. 1933a) ; these two substances were definitely toxic in the lower pi I ranges (), while above pi I they actually accelerated growth of Colpidinin sli-iatinn and (". caiiif>ylnin. For this reason pantothenic acid was tested over a wide pH 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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