FORSTER 1 has recently examined the peritrophic membrane in Caridea (Crustacea, Decapoda). He found a membrane in the mid-gut of all the Caridea examined and was able to show that it was chitinous.

Freshwater lakes are often polluted with various heavy metals in the Anthropocene. The iron-oxidizing microorganisms and their mineralized products can coprecipitate with many heavy metals, including ...