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It is shown that in the chloroplast periodic structure with a defect, the resonant absorption of light can be implemented. It is found that the resonant light absorption depends significantly on the position of a defect. In terms of the absorption of light energy, an asymmetric resonator is more efficient than a symmetric one.

In the hydroponic culture of T aestivum the biological activity of humic acid HA preparations in the form of nanoparticles of different sizes were studied When cultured on media containing HA preparations the content of carbonylated proteins malonic aldehyde and proline which are the markers of induced oxidative stress increased in the roots of the day seedlings The oxidative stress induced by HA was accompanied by an increase in the number of free border cells and the size of the mucilage cup in the root apex of the day seedlings but destructive changes in the root apex and root growth inhibition were not observed The effects of HA preparations were dose dependent and varied significantly depending on the size of the HA nanoparticles

Magnetomechanical cell disruption using nano- and microsized structures is a promising biomedical technology used for noninvasive elimination of diseased cells. It applies alternating magnetic field (AMF) for ferromagnetic microdisks making them oscillate and causing cell membrane disruption with cell death followed by apoptosis. In this study, we functionalized the magnetic microdisks with cell-binding DNA aptamers and guided the microdisks to recognize cancerous cells in a mouse tumor in vivo. Only 10 min of the treatment with a 100 Hz AMF was enough to eliminate cancer cells from a malignant tumor. Our results demonstrate a good perspective of using aptamer-modified magnetic microdisks for noninvasive microsurgery for tumors.