Dynamics of magnetization growth and relaxation in ferrofluids.

The dynamics of the growth and relaxation of the magnetization in ferrofluids are determined using theory based on the Fokker-Planck-Brown equation, and Brownian-dynamics simulations. Magnetization growth starting from an equilibrium nonmagnetized state in zero field, and following an instantaneous application of a uniform field of arbitrary strength, is studied with and without interparticle interactions. Similarly, magnetization relaxation is studied starting from an equilibrium magnetized state in a field of arbitrary strength, and following instantaneous removal of the field.

Orientational and crystallographic relationships in thin films of yttrium orthoferrite on sapphire substrates.

An algorithm is proposed for determining the orientational relationships and crystal unit-cell parameters of thin films using a laboratory X-ray diffractometer and stereographic projections. It is illustrated by the treatment of experimental data obtained for yttrium orthoferrite YFeO films on single crystalline sapphire (AlO) substrates for film thicknesses in the range from 100 to 7000 Å. Precise determination of unit-cell constants and angles is possible by combining the results of X-ray measurements made in the in-plane and out-of-plane geometries.

Environmental assessment of livestock farms in the context of BAT system introduction in Russia.

The article focuses on the environmental and economic assessment of animal/poultry manure utilisation technologies as the sources of the greatest negative impact on environment from agriculture. This procedure is especially topical in the context of current transition to BAT system in Russia. Russian BAT reference books on intensive rearing of pigs and intensive rearing of poultry came into force on June 1, 2018.

Structural coupling across the direct EuO/Si interface.

The ferromagnetic semiconductor EuO is believed to be an effective spin injector when directly integrated with silicon (Si). Injection through spin-selective ohmic contact requires superb structural quality of the interface EuO/Si. A recent breakthrough in manufacturing free-of-buffer-layer EuO/Si junctions calls for structural studies of the interface between the semiconductors.

[Alveolar bone and dental arch defects fulfillment in cleft lip and palate patients].

Nine cleft lip and palate patients aged 17-32 years were included in the study, all having significant maxilla alveolar bone defects. Oral rehabilitation was possible by means of bone augmentation with iliac crest graft, soft tissue plasty and subsequent dental implantation (3 to 6 months after first-step procedures).

[The autovenous by-pass by distal arterial occlusion of lower limbs in patients with diabetes mellitus].

Results of the autovenous by-pass in situ by distal combined arterial occlusion of femoral-popliteal and ankle arterial segments were analyzed. The main group consisted of 43 patients with diabetes mellitus and lower limbs ischemia grade IV in 81,4%. The comparison group consisted of 77 patients without diabetes and critical lower limbs ischemia in 84,4%.

[Formation of vertebral-subclavian steal syndrome in abnormal origin of the left vertebral artery from the aortic ark].

Presented herein is a clinical case report concerning the formation of vertebral-subclavian steal syndrome combined with occlusion of the left subclavian artery and an abnormal origin of the left vertebral artery from the aortic arch. Duplex scanning data and angiography findings showed that the collateral compensation of haemocirculation in the upper extremity took place through the subclavian-vertebral collateral net. Doppler ultrasonography signs of the latent steal syndrome were revealed in the intracranial segment of the left vertebral artery and were confirmed by the findings of the reactive hyperthermia test.

[Assessment of therapeutic efficacy in thromboses of the inferior vena cava by means of colour duplex scanning].

A total of two hundred and twenty-eight 18-to-83-year-old patients diagnosed with thrombotic occlusion of the lower-limb deep veins were examined in order to evaluate the possibilities of colour duplex angioscanning as a method aimed at monitoring both the course of and efficacy of treatment for acute venous thrombosis, as well as at preventing thromboembolic complications. Studied were the localization, incidence rate, and complications of the course of various types of venous thrombosis. It was demonstrated that an uncomplicated course the disease was observed in more than 80% of cases.

Ultrasound criteria for embologenicity of venous thrombosis.

Altogether 136 patients aged 17 to 79 years with a diagnosis of acute and subacute thrombosis of lower limb deep veins were examined by duplex scanning in order to derive the ultrasound criteria for embologenicity of inferior vena cava thrombosis. The authors evaluated thrombosis standing (from the emergence of the first clinical signs to its diagnosis), the length and site of the floating portion, the area of the transverse section of the thrombus, the character of the external contour, and the degree of thrombotic mass mobility. It has been established that: along with the generally accepted criteria for floating thrombi there is a number of the echographic characteristics which exert a significant effect on the probability of embolic complications; the degree of thrombotic mass mobility has a material effect on the incidence of thromboembolic complications and may be classified as insignificant, moderate and pronounced while embolic complications are largely present when the mobility of thrombotic masses is moderate or pronounced; the incidence of thromboembolic complications is significantly higher in the presence of a floating thrombus having uneven hypo- and isoechogenic contour and heterogeneous structure.

[The effect of carbacholine and pentagastrin on pancreatic secretory function during adaptation to a hyperlipemic diet].

Hyperlipemic diet (59% of fat) was found to increase the level of pancreatic secretion as well as its lipase activity in rats. The amylase and proteolytic enzyme activity was decreased. In hyperlipemic diet, carbachol and pentagastrin decreased the level of secretion and enzyme activity as compared with the balanced diet.

[Neurohumoral regulation of the secretory function of the pancreas during adaptation to protein-enriched food].

It is established in the experiments on rats that the sensitivity of pancreas acinar cells to carbacholine and pentagastrin change under conditions of "protein" diet (40% of protein) if compared to the balanced diet (18% of protein).