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Stresses in the Feeding Pump Lining of Ditylenchus Dipsaci Shown By Photoelastic Analysis of Perspex Models

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As a step towards understanding the workings of the tylenchid feeding pump, directions of closing stresses (induced in the thickened pump lining when it is opened by the radial muscles) have been determined for Ditylenchus dipsaci by an indirect photoelastic method, using Perspex models. The stress pattern is complex and symmetrical; compressive stresses run parallel to the surface on the convex side of the "hinges" as they open, and tensile stresses on the concave side. A point of maximum bending moment lies within each hinge, and points of minimum moment occur midway between the hinges. The cuticle of both hing regions is thought to act as integral springs to close the pump lining. Young's elastic modulus E was estimated as 3 X 108 dynes/cm2 and lining material is compared with other resilient animal materials; some tanned ligaments of bivalve molluscs are similar in elastic behaviour and function to the spring hinges of the pump lining. The lining cuticle may also be tanned, and has a fibrous fine structure.

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


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