A New Species of the Genus Leistus (Coleoptera, Carabidae) from China

Leistus (Evanoleistus) nanshanicus sp. n. from the Qilian Shan Mountain Range (China, prov. Gansu) is described. Its comparision with L. farkaci Sciaky is given.Описан Leistus (Evanoleistus) nanshanicus sp. n. с хребта Циляньшань (Китай, провинция Ганьсу). Приведено его сравнение с L. farkaci Sciak

Разработка методики расчета круговых прерывистых сварных швов на кручение

The main criterion for the performance of welds is the strength. The least durable are the corner joints used to perform various types of welded joints. In the literature, the methods of calculating the strength of welded joints with solid seams are considered in sufficient detail. Methods of calculation of connection interrupted sutures absent. In this case, the greatest difficulty is the calculation of connections using circular intermittent seams, which are often performed in welded drums and pulleys. They work on torsion. Therefore, the development of methods for calculating circular intermittent seams for torsion is quite important. Shear stresses in welds from torque are determined depending on the value of the polar moment of resistance of its dangerous section. When determining the polar moment of resistance of the dangerous section of a circular discontinuous seam, it was represented by a set of sections in the form of a sector of a circular ring. The method of calculation of the polar moment of resistance of the rotated dangerous section of a circular discontinuous weld, which takes into account the relative length of the weld areas and their number, is proposed, as well as the method of accurate and approximate calculation of shear stresses in the weld.Основным критерием работоспособности швов сварных соединений является прочность. Наименее прочными являются угловые швы, используемые для выполнения различных видов сварных соединений. В литературе достаточно подробно рассмотрены методы расчета на прочность сварных соединений сплошными швами. Методы расчета соединений прерывистыми швами отсутствуют. При этом наибольшие трудности представляет расчет соединений с помощью круговых прерывистых швов, которые довольно часто выполняются в сварных барабанах и шкивах. Они работают на кручение. Поэтому разработка методики расчета круговых прерывистых швов на кручение имеет достаточно важное значение. Касательные напряжения в сварных угловых швах от крутящего момента определялись в зависимости от величины полярного момента сопротивления его опасного сечения. При определении полярного момента сопротивления опасного сечения кругового прерывистого шва оно представлялось совокупностью участков в виде сектора кругового кольца. Разработана методика расчета полярного момента сопротивления повернутого опасного сечения кругового прерывистого сварного шва, которая учитывает относительную длину участков шва и их количество, а также методика точного и приближенного расчета касательных напряжений в данном сварном шве

Feasibility studies for the measurement of time-like proton electromagnetic form factors from p¯ p→ μ+μ- at P ¯ ANDA at FAIR

This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, | GE| and | GM| , using the p¯ p→ μ+μ- reaction at P ¯ ANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at P ¯ ANDA , using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is p¯ p→ π+π-, due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented

A New Species of the Genus Duvalius (Coleoptera, Carabidae, Trechini) from Kazakhstan

Duvalius putshkovi sp. n. is described from Kazakhstan (Western Tien-Shan, Ugam mountain ridge). The species belongs to the same species group as the most other representatives of the genus Duvalius Delar. from Middle Asia and is very closely related to Duvalius alexeevi Belousov, 1991 from Sary-Tshclek Reservcry (western Tien-Shan, Chatkal mountain ridge).Duvalius putshkovi sp. n. описан из Казахстана (Западный Тянь-Шань, Угамский хребет). Вид принадлежит к той же видовой группе, что и большинство других представителей рода Duvalius Delar из Средней Азии и особенно близок к Duvalius alexeevi Belousov, 1991, описанному из Сары-Челекского заповедника (Западный Тянь-Шань, Чаткальский хребет)

Consequences of Channelized and Diffuse Melt Transport in Supra-subduction Zone Mantle: Evidence from the Voykar Ophiolite (Polar Urals)

International audienceThe well-preserved, 6 km thick mantle section of the Voykar ophiolite in the Polar Urals contains numerous dunite bodies as well as dunite and pyroxenite veins within the host harzburgites. These rocks provide evidence of a composite asthenosphere-lithosphere history of partial melting, plastic deformation, multi-stage melt migration and melt-rock interaction. We investigated the petrology and geochemistry of multiple samples of the different mantle lithologies to define the sequence of mantle melting and melt migration events, as well as the composition of the percolating melts. Spinel harzburgites sampled far from dunite bodies and pyroxenite veins have fairly homogeneous bulk-rock, olivine and Cr-spinel compositions and are interpreted as residues after 14-16% of partial melting, most probably at a mid-ocean ridge. Near the contacts with the dunite bodies and pyroxenite veins, spinel peridotites demonstrate distinct compositional changes marking different stages of melt migration in a supra-subduction environment. At the earliest stage, which probably took place in the lithosphere-asthenosphere boundary of the forearc mantle at temperature between 1050 and 1200°C and a pressure of 1-1*7 GPa, the dunite bodies formed as a result of stress-driven focused melt flow. The latest stage melts moved in cracks under a conductive cooling regime within the lithospheric mantle section when it was horizontally displaced towards the trench. The trace element composition of the melts that migrated through the mantle section during dunite formation have geochemical characteristics like those of high-Ca boninites. The role of the slab-derived component progressively increased through time and late-stage, pyroxenite-forming melts were conspicuously rich in SiO2 and H2O. These low-viscosity melts impregnated the surrounding harzburgites, modifying or obliterating their primary composition

Droplet microfluidic device for chemoenzymatic sensing.

The rapid detection of pollutants in water can be performed with enzymatic probes, the catalytic light-emitting activity of which decreases in the presence of many types of pollutants. Herein, we present a microfluidic system for continuous chemoenzymatic biosensing that generates emulsion droplets containing two enzymes of the bacterial bioluminescent system (luciferase and NAD(P)H:FMN-oxidoreductase) with substrates required for the reaction. The developed chip generates "water-in-oil" emulsion droplets with a volume of 0.1 μL and a frequency of up to 12 drops per minute as well as provides the efficient mixing of reagents in droplets and their distancing. The bioluminescent signal from each individual droplet was measured by a photomultiplier tube with a signal-to-noise ratio of up to 3000/1. The intensity of the luminescence depended on the concentration of the copper sulfate with the limit of its detection of 5 μM. It was shown that bioluminescent enzymatic reactions could be carried out in droplet reactors in dispersed streams. The parameters and limitations required for the bioluminescent reaction to proceed were also studied. Hereby, chemoenzymatic sensing capabilities powered by a droplet microfluidics manipulation technique may serve as the basis for early-warning online water pollution systems

Accumulation of storage proteins in plant seeds is mediated by amyloid formation

Copyright: © 2020 Antonets et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Amyloids are protein aggregates with a highly ordered spatial structure giving them unique physicochemical properties. Different amyloids not only participate in the development of numerous incurable diseases but control vital functions in archaea, bacteria and eukarya. Plants are a poorly studied systematic group in the field of amyloid biology. Amyloid properties have not yet been demonstrated for plant proteins under native conditions in vivo. Here we show that seeds of garden pea Pisum sativum L. contain amyloid-like aggregates of storage proteins, the most abundant one, 7S globulin Vicilin, forms bona fide amyloids in vivo and in vitro. Full-length Vicilin contains 2 evolutionary conserved β-barrel domains, Cupin-1.1 and Cupin-1.2, that self-assemble in vitro into amyloid fibrils with similar physicochemical properties. However, Cupin-1.2 fibrils unlike Cupin-1.1 can seed Vicilin fibrillation. In vivo, Vicilin forms amyloids in the cotyledon cells that bind amyloid-specific dyes and possess resistance to detergents and proteases. The Vicilin amyloid accumulation increases during seed maturation and wanes at germination. Amyloids of Vicilin resist digestion by gastrointestinal enzymes, persist in canned peas, and exhibit toxicity for yeast and mammalian cells. Our finding for the first time reveals involvement of amyloid formation in the accumulation of storage proteins in plant seeds