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A simple method to model the reduced environment of lake bottom sapropel formation

Chinese Journal of Oceanology and Limnology 2017年第4期35卷 956-966页

作者： Olga L.GASKOVA vera d.strakhovenko Nadezhda I.ERMOLAEVA Eugene Yu.ZARUBINA Ekaterina A.OVdINA V.S.Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences Novosibirsk State University Institute for Water and Environmental Problems Siberian Branch of the Russian Academy of Sciences

The Kambala and Barchin brackish lakes （Baraba steppe, southern West Siberia） contain an organic-rich sapropel layer that was formed in oxygen-depleted waters. We measured the bulk sediment elemental composition, the water chemistry and determined the mineralogical composition and predominant biota species （diatoms and Cyanobacteria in phytoplankton community respectively） in the lakes. The result indicates that the first lake has a siliceous type of sapropel and the second a carbonaceous one. A computer thermodynamic model was developed for chemical interaction in water-bottom sediment systems of the Kambala and Barchin Lakes. The surface sodium bicarbonate waters are supersaturated with respect to calcite, magnesite （or low Mg-calcite）, quartz and chlorite with minor strontianite, apatite and goethite （pH 8.9-9.3, Eh 0.3 V）. Nevertheless, it is shown that during sapropel deposition, deep silt waters should be anoxic （Eh〈0 V）. The virtual component CH20 has been used to create an anoxic environment suitable for pyrite formation due to the biotic community impact and abiotic reduction. Thermodynamic calculation has shown that silt water is not necessarily euxinic （anoxic and sulfidic）. depending on Eh, sulfate sulfur can dominate in solution, causing the formation of gypsum together with pyrite. An attempt was made to find a reason for solution supersaturation with respect to Ca and Mg ions due to their complexation with humic acids.

关键词： brackish lakes sapropel sediments mineral composition silica calcite thermodynamic calculations

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Chemical and biological features of the saline Lake Krasnovishnevoye(Baraba,Russia)in comparison with Lake Malinovoe(Kulunda,Russia):a reconnaissance study

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Journal of Oceanology and Limnology 2018年第6期36卷 1993-2001页

作者： Anastasia KOMOVA Anna MELNIKOVA Zorigto NAMSARAEV Roman ROMANOV vera strakhovenko Ekaterina OVdINA Nadezhda ERMOLAEVA National Research Centre“Kurchatov Institute” Moscow 123182Russia Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences Novosibirsk 630090Russia V.S.Sobolev Institute of Geology and Mineralogy of the Russian Academy of Sciences Novosibirsk 630090Russia Institute for Water and Environmental Problems Siberian Branch of the Russian Academy of SciencesBarnaul 656038Russia

The Baraba and Kulunda steppes are located in southwestern Siberia in an area with an arid continental climate. This paper presents results of the first study of the hypersaline Lake Krasnovishnevoye(Baraba steppe, TdS(total dissolved solids)=297 g/L, pH 7.88). The major chemical, mineralogical and biological features of the lake were studied and compared to those of Lake Malinovoe, a typical saline neutral lake of Kulunda steppe(TdS=396 g/L, pH 7.63). The phytoplankton composition and the culturable diversity of anoxygenic phototrophic bacteria from Lake Krasnovishnevoye correspond to the ones in the Kulunda lakes. Nevertheless, the peculiarities of water composition and regime of Lake Krasnovishnevoye reduce the biodiversity to prokaryotes and unicellular algae.

关键词： saline and soda lakes hydrochemistry hydrobiology phytoplankton zooplankton anoxygenic phototrophic bacteria

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distribution of Macro-elements and Natural Radionuclides in the Bottom Sediments and Soils of the Catchment Areas of Small Lakes in the Baikal Region

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地学前缘 2009年第S1期16卷 22-22页

作者： Vosel Yulia strakhovenko vera Institute of Geology and Mineralogy SB RAS

The examination of macroelements and natural radionuclides in the bottom sediments of small lakes and soils in the catchment areas of the Baikal region allows for the study of the mechanism of inflow and the source of these *** the basis of the results of rentgenostructural analysis lake sediments are divided into four types:terrigenous,carbonate, terrigenous-carbonate and *** the analysis of gamma-ray spectrometry and ato-

关键词： lake bottom sediments catchment areas Th/U

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A proctolin-like peptide is regulated after baculovirus infection and mediates in caterpillar locomotion and digestion

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Insect Science 2022年第1期29卷 230-244页

作者： Angel Llopis-Giménez Stefano Parenti Yue Han vera I.d.Ros Salvador Herrero department of Genetics and Institut Universitari en Biotecnologia i Biomedicina(BIOTECMEd) Universitat de ValenciaValenciaSpain Laboratory of Virology Wageningen University and ResearchWageningenthe Netherlands Current address.department of Pathology University of CambridgeCambridgeUK

Baculoviruses constitute a large group of invertebrate dNA viruses, predominantly infecting larvae of the insect order Lepidoptera. during a baculovirus infection, the virus spreads throughout the insect body producing a systemic infection in multiple larval tissues, included the central nervous system (CNS). As a main component of the CNS, neuropeptides are small protein-like molecules functioning as neurohormones, neurotransmitters, or neuromodulators. These peptides are involved in regulating animal physiology and behavior and could be altered after baculovirus infection. In this study, we have investigated the effect of Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) infection on expression of Spodoptera exigua neuropeptides and neuropeptide-like genes. Expression of the gene encoding a polypeptide that resembles the well-known insect neuropeptide proctolin and named as proctolin-like peptide (PLP), was downregulated in the larval brain following infection and was chosen for further analysis. A recombinant Autographa californica multiple nucleopolyhedrovirus (AcMNPV) overexpressing the C-terminal part of the PLP was generated and used in bioassays using S. exigua larvae to study its influence on the viral infection and insect behavior. AcMNPV-PLP-infected larvae showed less locomotion activity and a reduction in growth compared to larvae infected with wild type AcMNPV or mock-infected larvae. These results are indicative of this new peptide as a neuromodulator that regulates visceral and skeletal muscle contractions and offers a novel effector involved in the behavioral changes during baculovirus infection.

关键词： beet armyworm behavior neuromodulator neuropeptide physiology SeM-NPV

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Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins

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Collagen and Leather 2023年第2期5卷 119-131页

作者： Yuanhang Xiao Jiajing Zhou Chunhua Wang Jinwei Zhang vera d.Radnaeva Wei Lin department of Biomass and Leather Engineering Key Laboratory of Leather Chemistry and Engineering of Ministry of EducationSichuan UniversityChengdu 610065China department of NanoEngineering University of California San Diego9500 Gilman DriveLa JollaCA 92093USA department of Leather and Fur Technology Water Resources and Commodity Research East Siberia State University of Technology and ManagementUlan-UdeBuryatiaRussia 670013 National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065China

Restrictions on heavy metals,especially chromium,have encouraged alternative tanning systems that can reduce environmental and human health risks from conventional chrome-based *** this work,metal-free combination tanning was developed by using vegetable tannins and a triazine-based syntan containing active chlorine groups(SACC).Specifically,the relationship between leather performance(e.g.,hydrothermal stability and organoleptic properties)and technical protocols(e.g.,types and dose of tannins)was systematically *** optimized protocol involving a unique procedure(i.e.,10%SACC pre-tanning,shaving,and 25%wattle tanning)endowed the leather with high shrinkage temperature(~92℃)and met the Chinese standards for shoe upper leather(QB/T 1873-2010).Our method not only produces zero chrome-containing solid wastes,but also uses~75%less tannin for leather *** excellent leather performance was ascribed to the synergistic effects,where SACC and wattle diffused into collagen fibrils and may bind to collagen via covalent,hydrogen and ionic bonding,locking the hierarchical structure of collagen from microfibrils to fiber ***,we summarized these findings and proposed a diffusion-binding-locking mechanism,providing new insights for current tanning *** with the biodegradable spent tanning liquor,this approach will underpin the development of sustainable leather manufacture.

关键词： Metal-free tanning Triazine derivative Vegetable tannins Synergistic effect Eco-friendly leather

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Improvement of VIS and IR camouflage properties by impregnating cotton fabric with PVB/IF-WS_(2)

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defence Technology（防务技术） 2021年第6期17卷 2050-2056页

作者： Aleksandra d.Samolov danica M.Simic Bojana Z.Fidanovski vera M.Obradovic Ljubisa d.Tomic dragan M.Knezevic Military Technical Institute Ratka Resanovica 111000BelgradeSerbia Innovation Center of Faculty of Technology and Metallurgy LTd.in Belgrade 4 Karnegijeva Street11120BelgradeSerbia

In order to examine the possibility to improve its camouflage properties standard cotton fabric with camouflage print was impregnated with poly(vinyl butyral),PVB and fullerene-like nanoparticles of tungsten disulfide,PVB/IF-WS_(2).FTIR analysis excluded any possible chemical interaction of IF-WS_(2) with PVB and the *** camouflage behavior of the impregnated fabric has been examined firstly in the VIS part of the *** reflection,specular gloss and color coordinates were measured for three different shades(black,brown and dark green).Thermal imaging was applied to examine the camouflage abilities of this impregnation in IR part of the *** obtained results show that PVB/IF-WS_(2) impregnation system induced enhacement of the materials camouflage properties,*** IF-WS_(2) have a positive effect on spectrophotometric characteristics of the fabric.

关键词： Textile materials Camouflage properties Tungsten disulfide poly(vinyl butyral) Thermal imaging

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Effect of poly(3-hydroxyalkanoates) as natural polymers on mesenchymal stem cells

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World Journal of Stem Cells 2019年第10期11卷 764-786页

作者： vera Voinova Garina Bonartseva Anton Bonartsev Faculty of Biology M.V.Lomonosov Moscow State UniversityMoscow 119234Russia A.N.Bach Institute of Biochemistry Research Center of Biotechnology of the Russian Academy of SciencesMoscow 119071Russia

Mesenchymal stem cells(MSCs)are stromal multipotent stem cells that can differentiate into multiple cell types,including fibroblasts,osteoblasts,chondrocytes,adipocytes,and myoblasts,thus allowing them to contribute to the regeneration of various tissues,especially bone *** are now considered one of the most promising cell types in the field of tissue *** petri dish-based culture of MSCs generate heterogeneity,which leads to inconsistent efficacy of MSC *** and biocompatible polymers,poly(3-hydroxyalkanoates)(PHAs),are actively used for the manufacture of scaffolds that serve as carriers for MSC *** growth and differentiation of MSCs grown on PHA scaffolds depend on the physicochemical properties of the polymers,the 3d and surface microstructure of the scaffolds,and the biological activity of PHAs,which was discovered in a series of *** mechanisms of the biological activity of PHAs in relation to MSCs remain insufficiently *** suggest that this effect on MSCs could be associated with the natural properties of bacteria-derived PHAs,especially the most widespread representative poly(3-hydroxybutyrate)(PHB).This biopolymer is present in the bacteria of mammalian microbiota,whereas endogenous poly(3-hydroxybutyrate)is found in mammalian *** possible association of PHA effects on MSCs with various biological functions of poly(3-hydroxybutyrate)in bacteria and eukaryotes,including in humans,is discussed in this paper.

关键词： Mesenchymal stem cells Polyhydroxyalkanoates Poly(3-hydroxybutyrate) Tissue engineering differentiation Natural functions Microbiota Bone Intestine

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3d finite element method （FEM） simulation of groundwater flow during backward erosion piping

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Frontiers of Structural and Civil Engineering 2014年第2期8卷 160-166页

作者： Kristine VANdENBOER vera van BEEK Adam BEZUIJEN department of Civil Engineering Ghent University Ghent 9000 Belgium deltares Delft 2628 Netherlands Section Geoengineering Delft University of Technology Delft 2628 Netherlands

Backward erosion piping is an important failure mechanism for cohesive water retaining structures which are founded on a sandy aquifer. At present, the prediction models for safety assessment are often based on 2d assumptions. In this work, a 3d numerical approach of the groundwater flow leading to the erosion mechanism of backward erosion piping is presented and discussed. Comparison of the 2d and 3d numerical results explicitly demonstrates the inherent 3d nature of the piping phenomenon. In addition, the influence of the seepage length is investigated and discussed for both piping initiation and piping progression. The results clearly indicate the superiority of the presented 3d numerical model compared to the established 2d approach. Moreover, the 3d numerical results enable a better understanding of the complex physical mechanism involved in backward erosion piping and thus can lead to a significant improvement in the safety assessment of water retaining structures.

关键词： backward erosion piping groundwater flow 3d finite element method (FEM)

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MicroRNA-630:A promising avenue for alleviating inflammation in diabetic kidney disease

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World Journal of diabetes 2024年第7期15卷 1398-1403页

作者： Javier donate-Correa Ainhoa González-Luis Jésica díaz-vera Juan Ramón Hernandez-Fernaud Research Unit University Hospital Nuestra Señora de Candelaria(UHNSC)Santa Cruz de Tenerife 38010Spain department of Biochemistry MicrobiologyCell Biology and GeneticsInstituto de Tecnologías BiomédicasUniversidad de La LagunaSanta Cruz de Tenerife 38000Spain

diabetic kidney disease(dKd)is one of the complications of diabetes,affecting millions of people *** relentless progression of this condition can lead to kidney failure,requiring life-altering interventions such as dialysis or *** evidence suggests that immunologic and inflammatory elements play an important role in initiating and perpetuating the damage inflicted on renal tissues,exacerbating the decline in organ ***-like receptors(TLRs)are a family of receptors that play a role in the activation of the innate immune system by the recognition of pathogen-associated molecular *** data from in vitro and in vivo studies have highlighted the critical role of TLRs,mainly TLR2 and TLR4,in the pathogenesis of *** the diabetic milieu,these TLRs recognize diabetic-associated molecular signals,triggering a proinflammatory cascade that initiates and perpetuates inflammation and fibrogenesis in the diabetic *** non-traditional strategies targeting TLR signaling with potential therapeutic implications in dKd have been *** of these approaches is the use of microRNAs,small non-coding RNAs that can regulate gene *** editorial comments on the results of this approach carried out in a rat model of diabetes by Wu et al,published in this issue of the World Journal of *** results of the experimental study by Wu et al shows that microRNA-630 decreased levels compared to non-diabetic ***,microRNA-630 exerted anti-inflammatory effects in the kidneys of diabetic rats through the modulation of *** findings indicate that the microRNA-630/TLR4 axis might represent a pathological mechanism of dKd and a potential therapeutic target capable of curbing the destructive inflammation characteristic of dKd.

关键词： diabetes diabetic kidney disease Inflammation Toll-like receptor 4 microRNA-630

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Visible-light-induced synthesis of phosphorylated N-heterocycles through proton-coupled electron transfer

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Science China Chemistry 2021年第5期64卷 681-683页

作者： vera A.Vil’ Igor B.Krylov Alexander O.Terent’ev N.d.Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences Moscow 119991Russia

Phosphorus-containing organic compounds are important feedstock for the synthesis of value-added bioactive ***,the development of highly efficient synthetic methods for the construction of phosphorus-element bonds has drawn huge attention in the past decades[1].Particularly,the formation of P–C bonds from phosphoruscentered radicals has been demonstrated to be one of the most efficient and convenient strategies,which has been widely applied for the synthesis of organic phosphorus compounds in recent years.

关键词： synthesis bonds phosphorus

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