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Permeation Dynamics and Osmoregulation in Aphelenchus Avenae

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For more content, see Nematology.

Specific rate constants for the diffusion controlled permeation of Aphelenchus avenae by a wide variety of organic substances and the equilibrium constants for the process have been measured. In general, hydrophobic, nonpolar, organic soluble structures permeate the quickest and have the greatest affinity for the nematodes. In contrast, salts, hydrophilic, and polar substances are the slowest permeators and have the lowest affinity for the animals. The nematicide 1,3-dichloropropene in the fastest permeator (kin = 1.3 min-1, kout = .094 min-1) and glucose is one of the slowest (kin = 1.3 × 10-4 min-1, kout = 5 × 10-3 min-1). The small neutral polar molecules, water, acetone, and methanol are an exception to these findings. The rate in and out of these substances is unusually rapid. The results suggest a different path of permeation for those substrates. The water permeation rates are not affected over a wide range of osmotic pressure but the animals do decrease in size. The rate of shrinkage is slow at an osmotic pressure of 10 atm but approaches the rate of water permeation at 26 atmospheres. The results establish water movement as the dominant primary event in osmoregulation.

Affiliations: 1: Department of Nematology, University of California, Riverside, CA 92502, U.S.A.


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