Eurasian-scale experimental satellite-based quantum key distribution with detector efficiency mismatch analysis.

The Micius satellite is the pioneering initiative to demonstrate quantum teleportation, entanglement distribution, quantum key distribution (QKD), and quantum-secured communications experiments at the global scale. In this work, we report on the results of the 600-mm-aperture ground station design which has enabled the establishment of a quantum-secured link between the Zvenigorod and Nanshan ground stations using the Micius satellite. As a result of a quantum communications session, an overall sifted key of 2.

Semi-Empirical Satellite-to-Ground Quantum Key Distribution Model for Realistic Receivers.

Satellite-based link analysis is valuable for efficient and secure quantum communication, despite seasonal limits and restrictions on transmission times. A semi-empirical quantum key distribution model for satellite-based systems was proposed that simplifies simulations of communication links. Unlike other theoretical models, our approach was based on the experimentally-determined atmospheric extinction coefficient typical for mid-latitude ground stations.

Molecular genetic detection and differentiation of Xanthomonas oryzae pv. oryzicola, bacterial leaf streak agents of rice.

The genus Xanthomonas comprises phytopathogenic bacteria which infect about 400 host species, including a wide variety of economically important plants. Xanthomonas oryzae pv. oryzicola (Fang et al.

Optimizing the deployment of quantum key distribution switch-based networks.

Quantum key distribution (QKD) networks provide an infrastructure for establishing information-theoretic secure keys between legitimate parties via quantum and authentic classical channels. The deployment of QKD networks in real-world conditions faces several challenges, which are related in particular to the high costs of QKD devices and the condition to provide reasonable secret key rates. In this work, we present a QKD network architecture that provides a significant reduction in the cost of deploying QKD networks by using optical switches and reducing the number of QKD receiver devices, which use single-photon detectors.

Mathematical model of polymerase chain reaction with temperature-dependent parameters.

The course of the real-time polymerase chain reaction (PCR) is determined by the temperature dependence of the kinetics of the component reactions, particularly the DNA strand hybridization. To investigate the effect of thermal processes on the reaction behavior, a mathematical model in which the variable rate constant of dissociation of "primer-single strand" complexes depends on temperature was proposed. The reaction medium temperature, which depends on time, was also introduced into the model.

Alternative solution of the simplest model of enzymatic synthesis of nucleic acids by homotopy perturbation method.

Development of methods for obtaining approximate analytical solutions of nonlinear differential equations and their systems is a rapidly developing field of mathematical physics. Earlier, an approximate solution of the simplest system of kinetic enzymatic equations for calculating dynamics of complementary strands of nucleic acids was obtained. In this study, we consider an alternative approach to selecting the basic linear approximation of the used method, which makes it possible to obtain more accurate analytical solutions of the set problem.

Approximate analytic solution of a simple system of kinetic equations describing the enzymatic synthesis of nucleic acids.

Macroscopic kinetic models describing the process of polymerase chain reaction (PCR) are currently solved only by numerical methods, which hampers the development of effective software algorithms for processing the results of the reaction. This paper considers the application of the homotopy perturbation method for obtaining approximate analytical solution of the simplest system of enzymatic kinetic equations describing the synthesis of nucleic acid molecules during PCR. The resulting approximate analytic solution with high accuracy reproduces the results of a numerical solution of the system in a wide range of ratios of enzyme and substrate concentrations both for the case of a large excess of the substrate over the enzyme and vice versa.

Mathematics analysis of polymerase chain reaction kinetic curves.

The paper reviews different approaches to the mathematical analysis of polymerase chain reaction (PCR) kinetic curves. The basic principles of PCR mathematical analysis are presented. Approximation of PCR kinetic curves and PCR efficiency curves by various functions is described.

[THE EXPERIENCE OF ANAESTHESIA MANAGEMENT FOR SENSING OF NASOLACRIMAL DUCT IN CHILDREN].

Despite low invasiveness, lacrimal passages, intubation in children requires general anaesthesia to prevent traumatic and neurological complications. General anaesthesia with sevoflurane is optimal for technical simplicity, safety and controllability. Methods of face mask inhalation anesthesia with halothan and sevoflurane were compared in 996 patients.

Suspension column for recovery and separation of substances using ultrasound-assisted retention of bead sorbents.

A novel approach to sorption recovery and separation of different substances is proposed which is based on the use of suspended bead sorbents instead of conventional packed beds of such sorbents. This makes it possible to employ small-sized beads which are trapped in a low-pressure column due to ultrasound-assisted retention, without any frits to hold the sorption material. A flow system including a separation mini-column, named herein a suspension column, has been developed and tested by the studies of solid phase extraction (SPE) of trace metals from bi-distilled water and sea water using a 150-μL column with a silica-based sorbent containing iminodiacetic groups (DIAPAK IDA) and having a grain size of 6 μm.

Theoretical and experimental investigation of immunoprecipitation pattern formation in gel medium.

We present the results of our comprehensive study of precipitation pattern formation by interacting immunogenic proteins in a gel medium. Formation of immunoprecipitation patterns was studied both theoretically and experimentally. Based on a system of reaction-diffusion equations, continuous deterministic description provides a quantitative model of reaction kinetics.

[Ozone therapy in gastroduodenal pathology associated with Helicobacter pylori].

Three methods of ozone therapy (intravenous injection of ozonized physiologic saline, oral intake of ozonized low-mineral water and combination of the two treatments) were compared by efficacy in 215 patients with gastroduodenal pathology associated with Helicobacter pilori. All the techniques of ozone therapy proved effective in relation to regress of clinical symptoms, regeneration processes, eradication of Helicobacter pylori, but the combined regimen was the best.

[Experimental base for use of low-mineral water with a high concentration of organic substances in balneological practice].

Experimental evidence on stability of chemical composition (1991-2004), toxic and skin-irritating, mitotic and mutagenic, bacterio- and fungostatic actions of low-mineral water "Salekhard" with a high concentration of organic substances justifies initiation of clinical trials of therapeutic effects of this novel balneological factor in different diseases (locomotor, nervous, cardiovascular, cutaneous, etc.).

[A case of successful one-stage correction of abdominal aortic aneurysm and stenosis of the internal carotid artery in a 78-year-old patient].

Presented herein are the results of successful one-stage revascularization of the brain and reconstruction of the abdominal aorta in a 78-year old patient with infrarenal abdominal aortic aneurysm, the signs of rupture, stenosis of the left renal artery and multiple aortic arch lesions -- stenoses of both internal carotid arteries and both vertebral arteries. The sequence and technology of surgical intervention are described.

[A model for the formation of ring-shaped structures in colonies of mycelial fungi].

Mathematical model of the development of the pattern of colonies is considered. The model represents the systems of differential equations of the first order. It includes non-dimensional parameters characterizing the following features: concentration of substrate, concentration of metabolic products--growth inhibitor, mycelium and spores, radial and specific rate of mycelium growth, rate of substrate consumption and production of metabolic products, coefficients of diffusion of substrate and metabolic products, initial concentration of mycelium and substrate, time of delay of mycelium reaction on metabolic products and spore formation, threshold concentration of metabolic products.

[Degradation of phosphatidylnucleosides induced by phospholipases].

Hydrolysis of phosphatidylnucleosides, 5'-(rac-1-hexadecyl-2-palmitoyl-sn-glycero-3-phosphoryl)-3'-azido- 3'-deoxythymidine and -2',3'-didehydro-3'-deoxythymidine, effected by phospholipases (PL) A2, C, and D was studied to reveal the metabolism of these derivatives. It was shown that PLA2 deacetylates the glycerol residue at position 2, PLC is inactive, and PLD hydrolyzes the phosphatidylnucleosides to give free nucleosides.