Влияние солевого стресса на рост и некоторые физиологические показатели растений рода Nigella

The paper deals with the comparative analysis of data on the effects of salinity caused by the introduction of NaCl, the plants of the two species of Nigella — N. damascena and N. sativa.Статья посвящена сравнительному анализу данных по действию засоления, вызванного внесением NaCl, на растения двух видов рода Nigella (чернушка) — N. damascena и N. sativa

Current-sheet formation in incompressible electron magnetohydrodynamics

The nonlinear dynamics of axisymmetric, as well as helical, frozen-in vortex structures is investigated by the Hamiltonian method in the framework of ideal incompressible electron magnetohydrodynamics. For description of current-sheet formation from a smooth initial magnetic field, local and nonlocal nonlinear approximations are introduced and partially analyzed that are generalizations of the previously known exactly solvable local model neglecting electron inertia. Finally, estimations are made that predict finite-time singularity formation for a class of hydrodynamic models intermediate between that local model and the Eulerian hydrodynamics.Comment: REVTEX4, 5 pages, no figures. Introduction rewritten, new material and references adde

Сравнительный анализ физиологических механизмов солеустойчивости различных сортов горчицы

The comparison and assessment have been performed to characterize salt tolerance of some varieties of Indian mustard (Brassica juncea Czern.) seedlings and young plants. Some mechanisms of NaCl tolerance have been studied and the indirect relationship between accumulation of Cl ions in leaves and their proline content have been established. After 10-15 days of mustard plant salinisation, proline content decreased and the correlation between proline and proline dehydrogenase activity has been proved.Проведена сравнительная оценка устойчивости сортов горчицы cарептской (Brassica juncea Czern.) при воздействии засоления на стадии прорастания и роста молодых растений. Изучены некоторые механизмы адаптации растений к воздействию NaCl и установлена непрямая взаимосвязь между поступлением ионов хлора в листья растений и содержанием в них пролина. Было обнаружено падение пролина после 10-15 суток засоления растений горчицы и установлена корреляция между содержанием пролина и активностью фермента пролиндегидрогеназы

Finite time singularities in a class of hydrodynamic models

Models of inviscid incompressible fluid are considered, with the kinetic energy (i.e., the Lagrangian functional) taking the form ${\cal L}\sim\int k^\alpha|{\bf v_k}|^2d^3{\bf k}$ in 3D Fourier representation, where $\alpha$ is a constant, $0<\alpha< 1$. Unlike the case $\alpha=0$ (the usual Eulerian hydrodynamics), a finite value of $\alpha$ results in a finite energy for a singular, frozen-in vortex filament. This property allows us to study the dynamics of such filaments without the necessity of a regularization procedure for short length scales. The linear analysis of small symmetrical deviations from a stationary solution is performed for a pair of anti-parallel vortex filaments and an analog of the Crow instability is found at small wave-numbers. A local approximate Hamiltonian is obtained for the nonlinear long-scale dynamics of this system. Self-similar solutions of the corresponding equations are found analytically. They describe the formation of a finite time singularity, with all length scales decreasing like $(t^*-t)^{1/(2-\alpha)}$, where $t^*$ is the singularity time.Comment: LaTeX, 17 pages, 3 eps figures. This version is close to the journal pape

Применение обогащенной тромбоцитами плазмы для стимуляции биопластических процессов после артроскопической реконструкции передней крестообразной связки коленного сустава (обзор литературы)

Based on the analysis of the scientific publications, the authors analyzed the possibilities and effectiveness of platelet- rich plasma (PRP) application as a stimulator of engraftment and biological transformation of tendinous autografts and allografts after arthroscopic reconstruction of knee anterior cruciate ligament. The topic of impossibility of spontaneous recovery of torn anterior cruciate ligament of knee, and describe the staging of biological incorporation of tendinous transplant in a bone wall was discussed. The authors presented methods and techniques of accelerating engraftment of free tendinous graft into bone channels described in the literature and the difference of terms of remodeling the autografts and allografts. The effect of different techniques of sterilization and preservation of tendinous allografts on the change of their biological properties was disclosed.На основании анализа научных публикаций проанализированы возможности и эффективность применения обогащенной тромбоцитами плазмы как стимулятора процессов приживления и биологической трансформации сухожильных ауто- и аллотрансплантатов после артроскопической реконструкции передней крестообразной связки коленного сустава. Обсуждается вопрос о невозможности самопроизвольного восстановления передней крестообразной связки после ее разрыва, описывается стадийность биологической инкорпорации сухожильного трансплантата в стенку костного канала. Освещаются описанные в литературе методики и способы ускорения процессов приживления свободного сухожильного трансплантата в костных каналах, а также разница сроков ремоделирования ауто- и аллотрансплантатов. Показано влияние разных способов стерилизации и консервации аллосухожилий на изменение их биологических свойств

Prospects for terahertz imaging the human skin cancer with the help of gold-nanoparticles-based terahertz-to-infrared converter

The design is suggested, and possible operation parameters are discussed, of an instrument to inspect a skin cancer tumour in the terahertz (THz) range, transferring the image into the infrared (IR) and making it visible with the help of standard IR camera. The central element of the device is the THz-to-IR converter, a Teflon or silicon film matrix with embedded 8.5 nm diameter gold nanoparticles. The use of external THz source for irradiating the biological tissue sample is presumed. The converter's temporal characteristics enable its performance in a real-time scale. The details of design suited for the operation in transmission mode (in vitro) or on the human skin in reflection mode {in vivo) are specified.Comment: To be published in the proceedings of the FANEM2018 workshop - Minsk, 3-5 June 201