Label-free sensitive detection of influenza virus using PZT discs with a synthetic sialylglycopolymer receptor layer

We describe rapid, label-free detection of Influenza A viruses using the first radial mode of oscillations of lead zirconate titanate (PZT) piezoelectric discs with a 2 mm radius and 100 µm thickness fabricated from a piezoelectric membrane. The discs are modified with a synthetic sialylglycopolymer receptor layer, and the coated discs are inserted in a flowing virus suspension. Label-free detection of the virus is achieved by monitoring the disc radial mode resonance frequency shift. Piezo transducers with sialylglycopolymer sensor layers exhibited a long lifetime, a high sensitivity and the possibility of regeneration. We demonstrate positive, label-free detection of Influenza A viruses at concentrations below 105 virus particles per millilitre. We show that label-free, selective, sensitive detection of influenza viruses by home appliances is possible in principle.

Label-free sensitive detection of influenza virus using PZT discs with a synthetic sialylglycopolymer receptor layer

We describe rapid, label-free detection of Influenza A viruses using the first radial mode of oscillations of lead zirconate titanate (PZT) piezoelectric discs with a 2 mm radius and 100 µm thickness fabricated from a piezoelectric membrane. The discs are modified with a synthetic sialylglycopolymer receptor layer, and the coated discs are inserted in a flowing virus suspension. Label-free detection of the virus is achieved by monitoring the disc radial mode resonance frequency shift. Piezo transducers with sialylglycopolymer sensor layers exhibited a long lifetime, a high sensitivity and the possibility of regeneration. We demonstrate positive, label-free detection of Influenza A viruses at concentrations below 10⁵ virus particles per millilitre. We show that label-free, selective, sensitive detection of influenza viruses by home appliances is possible in principle.

[Study of the interaction between antigen-antibody complexes for label-free sensor application]

Nanomechanical cantilever systems have a great potential in design of the new type of label-free imunnosensors. They are based on the conversion of free energy change of the surface layer of the receptor by the reaction of molecular recognition between the antigen and antibody into mechanical deformation of microcantilever. But the mechanisms of molecular interactions in the layer are still not clear.

[Laser irradiation: study of general and local mechanisms of its action in irradiation of the eyeball. An experimental study. 3]

Rabbit ocular tissues, brain, and blood were examined before and after irradiation of the eyeball with He-Ne laser. Scanning electron microscopy, radioimmunoassay, and biochemical methods were employed in the study. The findings evidence that irradiation of the eyeball results in reduced lipid peroxidation activity and elevated antiradical defense enzymes activity not only in ocular tissues but in the corresponding brain hemisphere and blood, which fact appears to be due to direct effect of laser radiation on the blood and brain via the optic nerve that may be a light conductor for a certain wavelength. Local increase of the eyeball corneal permeability in laser irradiation may be explained by activation of membrane phospholipases, combined with electrolyte shifts; morphologically and functionally it manifests by changed endotheliocyte stereotopography.