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Observations On Gut ph aNd Absorption of Methyl Red and Neutral Red in the Intestinal Walls of Pelodera and Mesodiplogaster

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The literature on gut pH in nematodes is reviewed; early work was on free-living marine nematodes and later, on animal parasites. Except for Ascaris lumbricoide.r and Strongylus edentatus the nematodes tested showed acid gut reactions. The free-living soil nematodes, Pelodera lambdiensis and Mesodiplogaster sp. had oesophageal and intestinal contents that were just acid and the granular contents of cells of the intestinal wall were acid to different degrees. In Pelodera, cells just behind the anterior tip of the intestine were usually most acid. Methyl red and neutral red pH indicator dyes were absorbed selectively by different regions of the intestinal wall and by the two species.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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