Production of Filter Material from Polypropylene/Copolyamide Blend by Material Extrusion-Based Additive Manufacturing: Role of Production Conditions and ZrO Nanoparticles.

The effect of technological conditions of the process and zirconia (ZrO) nanoparticles on the properties of fine-fibrous filter materials (FMs) obtained by matrix polymer extraction from a microfibrillar composite formed using the material extrusion-based additive manufacturing method from a polypropylene (PP)/copolyamide blend is studied. Different processing schemes were used for obtaining filaments for material extrusion: scheme I-the use of a single-screw extruder at the stage of compounding; scheme II-the use of a single-screw extruder at the stage of compounding and orientational stretching in the course of strand formation; scheme III-the use of a twin-screw extruder at the stage of compounding, scheme IV-the addition of ZrO nanoparticles and use of a twin-screw extruder. It has been shown the possibility of reducing the diameters of the formed PP microfibrils by using the twin-screw extruder, as well as additional orientation drawing.

[Comparative characterization of results of the immunoenzyme method of interleukin-1 determination in blast transformation reaction with indomethacin].

Comparison of the results of blast transformation test and enzyme immunoassay of interleukin-1 in the blood serum and culture fluid demonstrated that assessment of phytohemagglutinin (PHA)-effected level of proliferative activity of lymphocytes is more informative for the diagnosis of manifest forms of HIV infection. Combined addition of PHA and indomethacin to cell culture by shifting the balance between prostaglandin E and interleukin-1 helps assess the contribution of macrophages to the development of HIV infection.

[Effect of pertussis antibodies on the induction of suppressor cells of humoral immunity in mice].

Standard pertussis agglutinative serum as well as antibodies to total and purified protective pertussis antigens, isolated from the serum by immunoadsorption technique, were studied. The treatment of donors with pertussis antibodies affected the T-suppressor formation, induced by high doses of sheep red blood cells, as was shown on the model of syngeneic transfer. Immunomodulating effect of antibodies, complementary to immunogen fraction of pertussis cells, was decreased.

[Evaluation of the indices of humoral and cellular immunity induced in mice of various genotypes by pertussis antigens].

The genetic predetermination of the level of immune reactions to the injection of corpuscular pertussis vaccine and purified soluble pertussis vaccine has been revealed. Genetic differences in the intensity of immune response are manifest in both humoral and cell-mediated immunity. C57BL/6 mice belong to strains with high responsiveness, while NIHHSFS/H and CBWA mice belong to strains with low responsiveness to Bordetella pertussis.