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On the Occurrence of Protein Platelets in the Pseudocoelom of a Nematode (Hydromermis Sp.; Mermithidae)

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image of Nematologica
For more content, see Nematology.

Disc-like protein platelets are described from the pseudocoelom of free living post-parasitic juveniles of Hydromermis sp. (Mermithidae). These platelets have an average diameter of 23.2 μ and an average width of 5.5 μ. They appear hyaline and homogeneous under bright field and are not refringent. They lack a nucleus and possess an indistinct limiting membrane. Electron micrographs showed the platelets to consist of a highly organized pattern of parallel, dense lines, evenly spaced at about 270 A. The entire platelet gave a strong positive reaction for protein while tests for tyrosine and uric acid were negative. On the basis of this study, it is concluded that similar objects previously reported from the pseudocoelom of mermithid nematodes and listed in Table I of this paper are probably also protein platelets.

Affiliations: 1: Department of Entomology and Parasitology, University of California, Berkeley, California 94720, U.S.A.


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