A statistical treatment on the data of egg size, i.e., inner (embryo) and outer (egg capsule) diameters, and thickness of the perivitelline space, has been carried out for the Barents Sea euphausiid, Thysanoessa raschii. Investigations demonstrate that (1) there is environmental adaptation (i.e., to temperature and salinity) of euphausiid egg size; (2) egg size (embryo diameter) is similar throughout the reproductive area, but reaches either lower or higher values in the expatriate zones; (3) both embryo size and female fecundity are controlled by natural selection.
The physicochemical and transport properties (ion-exchange capacity, water content, diffusion permeability, conductivity, and current-voltage characteristic) of a series of perfluorinated membranes with an inert fluoropolymer content from 0 to 40%, obtained by polymer solution casting, were studied. Based on the analysis of the parameters of the extended three-wire model, the effect of an inert component on the path of electric current flow in the membrane and its selectivity were estimated. The mechanical characteristics of the membranes, such as Young’s modulus, yield strength, tensile strength, and relative elongation, were determined from the dynamometric curves. The optimal amount of the inert polymer in the perfluorinated membrane was found to be 20%, which does not significantly affect its structure and electrotransport properties but increases the elasticity of the obtained samples. Therefore, the perfluorinated membrane with 20% of inert fluoropolymer is promising for its application in redox flow batteries and direct methanol fuel cells.
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