Medico-Sanitary and Parasitological Aspects of Rock Pigeon Ecology (<i>Columba livia</i>)

Collected are the data on sanitary-hygienic and parasitological aspects of rock pigeon vital activity in Saratov. Distinguished are the types of pigeon exterior pathologies, their character and frequency of occurrence. Synanthropic population and nests of the birds are searched for the presence of helminthes and ectoparasites. Identified is the role of nesting sites, located in attics of residential buildings, in sanitary and epidemiological situation of the city settlement zone

Superconducting-coil--resistor circuit with electric field quadratic in the current

It is shown for the first time that the observed [Phys. Lett. A 162 (1992) 105] potential difference Phi_t between the resistor and the screen surrounding the circuit is caused by polarization of the resistor because of the kinetic energy of the electrons of the superconducting coil. The proportionality of Phi_t to the square of the current and to the length of the superconducting wire is explained. It is pointed out that measuring Phi_t makes it possible to determine the Fermi quasimomentum of the electrons of a metal resistor.Comment: 2 pages, 1 figur

Magnetic Pinning of Vortices in a Superconducting Film: The (anti)vortex-magnetic dipole interaction energy in the London approximation

The interaction between a superconducting vortex or antivortex in a superconducting film and a magnetic dipole with in- or out-of-plane magnetization is investigated within the London approximation. The dependence of the interaction energy on the dipole-vortex distance and the film thickness is studied and analytical results are obtained in limiting cases. We show how the short range interaction with the magnetic dipole makes the co-existence of vortices and antivortices possible. Different configurations with vortices and antivortices are investigated.Comment: 12 pages, 12 figures. Submitted to Phys. Rev.

Analysis of Immunogenicity of Intracellular CTAR Fragments of Epstein—Barr Virus Latent Phase Protein LMP1

© 2017, Springer Science+Business Media, LLC. Intracellular fragments of latent phase protein LMP1 of Epstein—Barr virus, denoted as CTAR1/2/3, can trigger a variety of cell cascades and contribute to the transforming potential of the virus. Generation of recombinant proteins CTAR1/2/3 is expected to yield more ample data on functional and immunogenic characteristics of LMP1. We created genetic constructs for prokaryotic expression of LMP1 CTAR fragments and selected optimal conditions for their production and purification. Using a new library of LMP1 CTAR fragments, we carried out epitope mapping of a diagnostic anti-LMP1 antibody S12. Analysis of polyclonal serum antibodies from mice immunized with full-length LMP1 confirmed immunogenicity of CTAR elements comparable with that of full-length protein

Symmetry of the remanent state flux distribution in superconducting thin strips: Probing the critical state

The critical-state in a thin strip of YBaCuO is studied by magneto-optical imaging. The distribution of magnetic flux density is shown to have a specific symmetry in the remanent state after a large applied field. The symmetry was predicted [PRL 82, 2947 (1999)] for any Jc(B), and is therefore suggested as a simple tool to verify the applicability of the critical-state model. At large temperatures we find deviations from this symmetry, which demonstrates departure from the critical-state behavior. The observed deviations can be attributed to an explicit coordinate dependence of $j_c$ since both a surface barrier, and flux creep would break the symmetry in a different way.Comment: 5 pages including 5 eps figures, submitted to PR

From a nonlinear string to a weakly interacting Bose gas

We investigate a real scalar field whose dynamics is governed by a nonlinear wave equation. We show that classical description can be applied to a quantum system of many interacting bosons provided that some quantum ingredients are included. An universal action has to be introduced in order to define particle number. The value of this action should be equal to the Planck constant. This constrain can be imposed by removing high frequency modes from the dynamics by introducing a cut-off. We show that the position of the cut-off has to be carefully adjusted. Finally, we show the proper choice of the cut-off ensures that all low frequency eigenenmodes which are taken into account are macroscopically occupied.Comment: 7 pages, 4 figure

Importin α7 Is Essential for Zygotic Genome Activation and Early Mouse Development

Importin α is involved in the nuclear import of proteins. It also contributes to spindle assembly and nuclear membrane formation, however, the underlying mechanisms are poorly understood. Here, we studied the function of importin α7 by gene targeting in mice and show that it is essential for early embryonic development. Embryos lacking importin α7 display a reduced ability for the first cleavage and arrest completely at the two-cell stage. We show that the zygotic genome activation is severely disturbed in these embryos. Our findings indicate that importin α7 is a new member of the small group of maternal effect genes

Flux-Induced Vortex in Mesoscopic Superconducting Loops

We predict the existence of a quantum vortex for an unusual situation. We study the order parameter in doubly connected superconducting samples embedded in a uniform magnetic field. For samples with perfect cylindrical symmetry, the order parameter has been known for long and no vortices are present in the linear regime. However, if the sample is not symmetric, there exist ranges of the field for which the order parameter vanishes along a line, parallel to the field. In many respects, the behavior of this line is qualitatively different from that of the vortices encountered in type II superconductivity. For samples with mirror symmetry, this flux-induced vortex appears at the thin side for small fluxes and at the opposite side for large fluxes. We propose direct and indirect experimental methods which could test our predictions.Comment: 6 pages, Latex, 4 figs., uses RevTex, extended to situations far from cylindrical symmetr

Сеялка для разноглубинного посева зерновых и внесения минеральных удобрений

The article presents the main results of a three-year research on the use of a seeder with openers for different depths of grain sowing and mineral fertilizers application.Research purpose To compare SKP-2.1 seeder equipped with experimental openers and the serially produced one and to determine the yield and quality indicators of spring soft wheat grain, depending on the sowing method and the rate of nitrogen mineral fertilizers application.Materials and methods A comparative field agrotechnical experiment was carried out to compare the indicators of field germination, yield by variants and the quality of grain obtained in different variants of the experiment. The experiment was carried out on Omskaya-36 soft spring wheat. The sowing performed by SKP-2.1 serially produced seeder-cultivator was taken as control. The experimental plots were sown with the same seeder but equipped with combined coulters, which are lancet paws that ensure the placement of granular mineral fertilizers and seeds in soil horizons of different depths.Results and discussion According to the three-year research, the maximum economic effect was obtained at the rate of ammonium nitrate application of 150 kg/ha. As a result, the yield increased by 0.44 t/ha, the cost of additional production accounted for 6740 rub/ha. A slight decrease in the economic effect was revealed with an increase in the rate of fertilizer application. It was determined that the maximum yield and the best grain quality characteristics both in the control sowing options and in the experimental ones were obtained with the application of ammonium nitrate a rate of 150 and 200 kg/ha.Conclusions It was established that the use of a seeder for different-depth grain sowing and mineral fertilizers application, depending on the spring weather conditions and the ammonium nitrate dose, provides an increase in field germination by 11-18%; the average annual increase in grain yield accounted for 16.3%. The gluten content proved to increase from 24.6 (control) to 29.8 percent.Привели основные результаты трехлетних исследований применения сеялки с сошниками для разноглубинного посева зерновых и внесения минеральных удобрений.Цель исследования Сравнить переоборудованную экспериментальными сошниками сеялку СКП-2,1 с серийной, определить урожай и качество зерна яровой мягкой пшеницы в зависимости от способа посева и нормы внесения азотных минеральных удобрений.Материалы и методы Провели сравнительный полевой агротехнический опыт, в ходе которого сопоставили показатели полевой всхожести, урожайности по вариантам и качества зерна мягкой яровой пшеницы Омская-36. Приняли за контроль посев, выполненный серийно производимой сеялкой-культиватором СКП-2,1. Экспериментальные делянки засевали той же сеялкой, но переоборудованной комбинированными сошниками, представляющими собой стрельчатые лапы, обеспечивающие размещение гранулированных минеральных удобрений и семян в разных по глубине горизонтах почвы.Результаты и обсуждение По результатам трехлетнего опыта максимальный экономический эффект получили при норме внесения аммиачной селитры 150 килограммов на гектар: прибавка урожая составила 0,44 тонны на гектар, стоимость дополнительной продукции – 6740 рублей на гектар. Выявили незначительное снижение экономического эффекта при увеличении нормы внесения удобрения. Определили, что максимальная урожайность и лучшие качественные характеристики зерна как на контрольных вариантах посева, так и на экспериментальных получены при внесении аммиачной селитры в норме 150 и 200 килограммов на гектар.Выводы Установили, что использование сеялки для разноглубинного посева зерновых и внесения минеральных удобрений в зависимости от погодных условий весны и дозы внесения аммиачной селитры обеспечивает прирост полевой всхожести на 11-18 процентов; средняя ежегодная прибавка урожая зерна составила 16,3 процента. Выявили повышение содержания клейковины с 24,6 (контроль) до 29,8 процента

Инвазивный микоз с поражением центральной нервной системы, обусловленный редкими дрожжевыми грибами Malassezia spp., у пациентов с острым лейкозом: описание клинических случаев и обзор литературы

Malassezia spp. is a commensal yeast that represents normal microflora in humans and some animals. However, Malassezia spp. can cause life-threatening invasive mycosis. Evidence on Malassezia spp. infections is limited mostly to a case reports describing disease in newborns and premature infants, because lipid infusions (total parenteral nutrition) given through central venous catheter is a major risk factor. Here, we report two cases of CNS infection caused by Malassezia species in non-neonates with acute leukemia.Malassezia spp. — дрожжевые грибы, которые представлены в составе нормальной микрофлоры кожи человека и как симбионт препятствуют развитию инфекций, обусловленных опасными патогенами. Однако Malassezia spp. также может стать причиной тяжелого инвазивного микоза и привести к летальному исходу. Данные литературы ограничены, представлены преимущественно публикациями об инфекциях у новорожденных и недоношенных детей, что, в первую очередь, связывают с известным фактором риска — применение парентерального питания, включающего в себя жировую эмульсию, с использованием центрального венозного катетера. Мы представляем клинические случаи инфекции центральной нервной системы, обусловленной редкими возбудителями, дрожжевыми грибами рода Malassezia, у детей с острым лейкозом