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Advances in small animal mesentery models for in vivo flow cytometry,dynamic microscopy,and drug screening

World Journal of Gastroenterology 2007年第2期13卷 192-218页

作者： ekaterina I Galanzha valery v Tuchin vladimir P Zharov Philips Classic Laser Laboratories University of Arkansas for Medical Sciences (UAMS) Little Rock AR United States Department of Optics and Biomedical Physics Research-Educational Institute of Optics and Biophotonics Saratov State University Saratov Russia Department of Optics and Biomedical Physics Research-Educational Institute of Optics and Biophotonics Saratov State University Saratov Russia Philips Classic Laser Laboratories University of Arkansas for Medical Sciences (UAMS) Little Rock AR United States

Using animal mesentery with intravital optical microscopy is a well-established experimental model for studying blood and lymph microcirculation in vivo. Recent advances in cell biology and optical techniques provide the basis for extending this model for new applications, which should generate significantly improved experimental data. This review summarizes the achievements in this specific area, including in vivo label-free blood and lymph photothermal flow cytometry, super-sensitive fluorescence image cytometry, light scattering and speckle flow cytometry, microvessel dynamic microscopy, infrared (IR) angiography, and high-speed imaging of individual cells in fast flow. The capabilities of these techniques, using the rat mesentery model, were demonstrated in various studies; e.g., real-time quantitative detection of circulating and migrating individual blood and cancer cells, studies on vascular dynamics with a focus on lymphatics under normal conditions and under different interventions (e.g. lasers, drugs, nicotine), assessment of lymphatic disturbances from experimental lymphedema, monitoring cell traffic between blood and lymph systems, and high-speed imaging of cell transient deformability in flow. In particular, the obtained results demonstrated that individual cell transportation in living organisms depends on cell type (e.g., normal blood or leukemic cells), the cell’s functional state (e.g., live, apoptotic, or necrotic), and the functional status of the organism. Possible future applications, including in vivo early diagnosis and prevention of disease, monitoring immune response and apoptosis, chemo- and radio-sensitivity tests, and drug screening, are also discussed.

关键词： Lymph microcirculation Transmission digital microscopy Rat mesentery Flow cytometry Photothermal technique

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Age of maturation and behavioral tactics in male yellow ground squirrel Spermophilus fulvus during mating season

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Current Zoology 2014年第6期60卷 700-711页

作者： Nina A. vASILIEvA ekaterina v. PAvLOvA Sergey v. NAIDENKO Andrey v.TCHABOvSKY A.N. Severtsov Institute of Ecology and Evolution Russian Academy of Sciences 33 Leninsky pr. Moscow 119071 Russia

Life-history theory predicts that in hibemators age of maturation is related positively to body size and negatively to the duration of active season aboveground. Yellow souslik is a large-sized ground squirrel with long hibernation, which suggests late maturation. We used four-year field observations of marked individuals to determine the age of maturation in males through analysis of age-dependent variation in body size, mass, androgen status, timing of spring emergence, ranging patterns and social behavior during the mating season. Yearling males were smaller, lighter, had lower level of fecal testosterone, emerged later and had smaller home ranges than older males. Social activity and the number of females encountered did not differ between age classes. After the second hibernation none of the studied parameters varied with age. Cluster analysis revealed two behavioral tactics：＂active＂ males （adults only） emerged earlier, ranged more widely, initiated more contacts, encountered more females and were heavier than ＂passive＂ males （both yearling and adult）. Thus, males of S. fulvus reached adult size and matured after two hibernations, which is relatively fast for such a big species with short active period. Indirect evidence for copulations and high variation among yearlings in all parameters suggest that some of them might successfully compete with adults. Active tactic of wandering and searching for females is energetically costly, and probably only adult males in good physical condition can afford it, whereas passive tactic of residing is energy saving and good for adults in poor condition and for yearlings that are continuing to grow.

关键词： Age of maturation Mating system Reproductive tactics Ground squirrel Spermophilusfulvus

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Numerical 3D-modeling of spall and shear fractures in shells of austenitic 12Kh18N10T steel and 30KhGSA steel under their spherical and quasi-spherical explosive loading

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第1期6卷 173-211页

作者： Evgeny A.Kozlov Oleg v.Ol’khov ekaterina v.Shuvalova Russian Federal Nuclear Center–Zababakhin Research Institute of Technical Physics Snezhinsk Russia Russian Federal Nuclear Center–Research Institute of Experimental Physics Sarov Russia

To pursue vNIIEF–vNIITF joint investigations,this paper briefly describes the experimental setup and provides numerical 3D-computation results(LEGAK-3D technique)on special features in the convergence dynamics of steel shells under their quasi-spherical explosive loading in the system with the 40-mm outer radius of the explosive *** computation results were compared with the data experimentally registered for shells of the 30KhGSA steel,both as-received and quenched to HRC 35...40,and the austenitic 12Kh18N10T stainless *** comparison was also made with laserinterferometry results obtained directly under explosive loading,as well as with gammatomography and scanning electron microscopy investigations of the recovered shells.

关键词： Convergence dynamics of shell spall and shear damages explosive loading

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Neurohumoral,cardiac and inflammatory markers in the evaluation of heart failure severity and progression

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Journal of Geriatric Cardiology 2021年第1期18卷 47-66页

作者： ekaterina A Polyakova Evgeny N Mikhaylov Dmitry L Sonin Yuri v Cheburkin Mikhail M Galagudza Almazov National Medical Research Centre Saint-PetersburgRussia

Heart failure is common in adult population,accounting for substantial morbidity and mortality *** main risk factors for heart failure are coronary artery disease,hypertension,obesity,diabetes mellitus,chronic pulmonary diseases,family history of cardiovascular diseases,cardiotoxic *** main factor associated with poor outcome of these patients is constant progression of heart *** the current review we present evidence on the role of established and candidate neurohumoral biomarkers for heart failure progression management and diagnostics.A growing number of biomarkers have been proposed as potentially useful in heart failure patients,but not one of them still resembles the characteristics of the"ideal biomarker."A single marker will hardly perform well for screening,diagnostic,prognostic,and therapeutic management ***,the pathophysiological and clinical significance of biomarkers may depend on the presentation,stage,and severity of the *** authors cover main classification of heart failure phenotypes,based on the measurement of left ventricular ejection fraction,including heart failure with preserved ejection fraction,heart failure with reduced ejection fraction,and the recently proposed category heart failure with mid-range ejection *** could envisage specific sets of biomarker with different performances in heart failure progression with different left ventricular ejection fraction especially as concerns prediction of the future course of the disease and of left ventricular adverse/reverse *** article is intended to provide an overview of basic and additional mechanisms of heart failure progression will contribute to a more comprehensive knowledge of the disease pathogenesis.

关键词： cardiac and inflammatory markers in the evaluation of heart failure severity and progression Neurohumoral

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Photocatalytic Treatment of Waste Water from Rice Husk Alkaline Hydrolysate

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Rice science 2019年第4期26卷 257-260页

作者： Olga D. AREFIEvA Marina S. vASILYEvA ekaterina v. ERMOLENKO Anastasiia v. BYCHKOvA Far Eastern Federal University Vladivostok 690950Russian Federation Institute of Chemistry Far-Eastern BranchRussian Academy of Sciences Vladivostok 690022 Russian Federation National Scientific Center of Marine Biology Far Eastern BranchRussian Academy of SciencesVladivostok 690041Russian Federation

We carried out photocatalytic treatment of a lignin-free solution of rice husk alkaline hydrolysate [pH of 2, chemical oxygen demand（COD） of 12.8 g/L] using photo-Fenton process in the ultraviolet（Uv, wavelength of 365 nm） and visible spectrum. Oxidation of lignin was performed at a constant mass ratio of COD:H2O2 as 1:2 and Fe2+ concentration of 80 mg/L. It was established that for the destruction of alkaline lignin, exposure to visible or Uv radiation was necessary. Decolorization efficiency of a lignin-free solution depends on the dilution rate of the solution. The advanced oxidative photo-Fenton process(Uv/Н2О2/Fe2+) made it possible to reduce the color of lignin-free solution at a dilution ratio of 1:5 by 94% of decolorization efficiency, 87% of phenolic compound and 79% of COD. With the help of gas chromatography, the products of lignin destruction were low-toxic and usable.

关键词： chemical oxygen demand dilution ratio visible spectrum

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Molecular testing for colorectal cancer:Clinical applications

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World Journal of Gastrointestinal Oncology 2021年第10期13卷 1288-1301页

作者： Evgeny Imyanitov ekaterina Kuligina Department of Tumor Biology N.N.Petrov Institute of OncologySt.-Petersburg 197758Russia Department of Medical Genetics St.-Petersburg Pediatric Medical UniversitySaint-Petersburg 194100Russia Department of Oncology I.I.Mechnikov North-Western Medical UniversitySaint-Petersburg 191015Russia

Molecular genetic analysis is an integral part of colorectal cancer(CRC)*** choice of systemic therapy for CRC is largely based on the results of tumor molecular *** of the KRAS and NRAS gene status is mandatory for consideration of anti-epidermal growth factor receptor(EGFR)*** with the BRAF v600E substitution are characterized by aggressive behaviour,may require intensified cytotoxic regimens and benefit from combined BRAF and EGFR *** inactivation of DNA mismatch repair(MMR),or MUTYH gene,or DNA polymerase epsilon results in excessive tumor mutational burden;these CRCs are highly antigenic and therefore sensitive to immune checkpoint *** CRCs are characterized by overexpression of the HER2 oncogene and respond to the appropriate targeted *** are CRCs with clinical signs of hereditary predisposition to this disease,which require germline genetic *** biopsy is an emerging technology that has the potential to assist CRC screening,control the efficacy of surgical intervention and guide disease *** landscape of CRC molecular diagnosis is currently undergoing profound changes due to the increasing use of next generation sequencing.

关键词： Colorectal cancer Anti-epidermal growth factor receptor therapy KRAS NRAS BRAF HER2 Microsatellite instability MUTYH Hereditary cancer

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Jasmonic Acid Oxidase 2 Hydroxylates Jasmonic Acid and Represses Basal Defense and Resistance Responses against Botrytis cinerea Infection

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Molecular Plant 2017年第9期10卷 1159-1173页

作者： ekaterina Smirnova Institut de Biologie Moléculaire des Plantes CNRS Université de Strasbourg Strasbourg France Laboratoire de Chimie Organique Synthétique Institut de Chimie Université de Strasbourg CNRS Strasbourg France

Jasmonates （JAs） orchestrate immune responses upon wound/herbivore injury or infection by necrotro- phic pathogens. Elucidation of catabolic routes has revealed new complexity in jasmonate metabolism. Two integrated pathways attenuate signaling by turning over the active hormone jasmonoyl-isoleucine （JA-Ile） through w-oxidation or deconjugation, and define an indirect route forming the derivative 12OH-JA. Here, we provide evidence for a second 12OH-JA formation pathway by direct jasmonic acid （JA） oxidation. Three jasmonic acid oxidases （JAOs） of the 2-oxoglutarate dioxygenase family catalyze spe- cific oxidation of JA to 12OH-JA, and their genes are induced by wounding or infection by the fungus Botrytis cinerea. JA02 exhibits the highest basal expression, and its deficiency in jao2 mutants strongly enhanced antifungal resistance. The resistance phenotype resulted from constitutive expression of antimi- crobial markers rather than from their higher induction in infected jao2 plants and could be reversed by ectopic expression of any of the three JAOs injao2. Elevated defense injao2 was dependent on the activity of JASMONATE RESPONSE 1 （JAR1） and CORONATINE-INSENSITIvE 1 （COI1） but was not correlated with erihanced JA-Ile accumulation. Instead, jao2 mutant lines displayed altered accumulation of several JA species in healthy and challenged plants, suggesting elevated metabolic flux through JA-Ile. Collectively, these data identify the missing enzymes hydroxylating JA and uncover an important metabolic diversion mechanism for repressing basal JA defense responses.

关键词： 2-oxoglutarate oxygenase jasmonic acid defense regulation hormone metabolism Botrytis

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Left atrial appendage occluder implantation for stroke prevention in elderly patients with atrial fibrillation： acute and long-term results

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Journal of Geriatric Cardiology 2017年第9期14卷 590-592页

作者： Karapet v Davtyan Andrey A Kalemberg Arpi H Topchyan Georgiy Y Simonyan ekaterina v Bazaeva victoria S Shatahtsyan Laboratory for Interventional Arrhythmia Treatment of “National Medical Research Center for Preventive Medicine” Ministry of Healthcare of the RussianFederation Petroverigskiy lane Moscow Russia

Atrial fibrillation （AF） is the most common cardiac ar-rhythmia in clinical practice with an increasing incidenceand prevalence. With ageing, the risk of thromboembolicand hemorrhagic events increases dramatically. As it hasbeen reported previously, 3-year survival rate among pa-tients with AF over 75 years of age after stroke is less than50%, and almost 90% of those patients will remain dis-abled.

关键词： Left atrial appendage closure Oral anticoagulation therapy Stroke prevention The elderly

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Substituted diamides of dipicolinic acid as extractants and ionophores for rare earth metals

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Journal of Rare Earths 2023年第8期41卷 1234-1241,I0005页

作者： Yingchao Ren valery A.Polukeev ekaterina v.Kenf Liudmila I.Tkachenko Mikhail Yu Alyapyshev vasily A.Babain Andrey v.Nechaev Andrey v.Legin Dmitry O.Kirsanov Institute of Chemistry Saint-Petersburg UniversityPeterhofUniversitetsky Prospect 26198504Saint-PetersburgRussia JSvC vekton Ul.2-oy Luch 9192019Saint-PetersburgRussia Khlopin Radium Institute 194021282nd Murinsky avRussia ThreeArc Mining LLC Pr.Narodnogo Opolchenia 10198216Saint-PetersburgRussia Rusredmet Vosstanovleniya str.15bl.3198320St.PeterburgKrasnoe seloRussia

The variety of newly synthesized diamides of dipicolinic acid(DPA)bearing methyl-and oxymethyl substituents in various positions of phenyl ring was investigated as potential ligands for liquid-liquid extraction of rare earth metal ions and as membrane active compounds in plasticized polymeric membranes of potentiometric *** is found that scandium is extracted with 2,6-pyridinedicarboxylic acid diamides similarly to heavy lanthanides,while yttrium is extracted together with light group *** shows high selectivity for the separation of cadmium/zinc,lead/nickel or copper/nickel *** four out of six studied ligands demonstrate significant potentiometric sensitivity towards scandium,yttrium and lanthanides in 10^(-7)-10^(-3)mol/L concentration range in nitric acid *** trends in sensitivity values vary depending on a ligand structure and the highest values are observed for Sc^(3+)and heavy *** to the evaluated selectivity Sm^(3+)is the most preferred ion,while La^(3+)is the most *** differences in sensor behavior in rare earth metal solutions assume that such devices can be applied in sensor arrays for potentiometric analysis of lanthanide mixtures.

关键词： Dipicolini cacid diamides Scandium Yttrium Lanthanides Extraction Potentiometric sensors

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Effect of Zr^(4+)on piezoelectric,dielectric and ferroelectric properties of barium calcium titanate lead-free ceramics

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Journal of Advanced Dielectrics 2021年第6期11卷 23-31页

作者： Prasanta Kumar Panda Benudhar Sahoo v.Sureshkumar ekaterina Dmitrievna Politova Materials Science Division CSIR-National Aerospace Laboratories KodihalliBengaluru 560017India Semenov Federal Research Centre for Chemical Physics Russian Academy of Sciences Kosygin 4Moscow 119991Russia

Ba_(0.85)Ca_(0.15)(Ti1−xZrx)O_(3)(BCTZ)ceramics with x=0.05,0.10,_(0.15),0.20,0.25,0.30 were prepared by the solid-state reaction *** of the powders was carried out at 1100°C for 4 h and the green pellets were sintered at 1400°C for 2 h.X-ray diffraction patterns of the sintered pellets showed tetragonal splitting up to x=0.10 while the mixture of the rhombohedral/cubic phase appeared at higher ZrO_(2)*** piezoelectric charge constant d33=510 pC/N and strain(S=0.103%)were measured for BCT doped by 0.10 mol ZrO_(2).Dielectric constant,remnant polarization and saturation polarization also found maxima for this *** Curie temperature(TC)of the compositions decreased with increase in ZrO_(2)concentration and reached 98°C,87°C and 36°C at x=0.05,0.10,_(0.15)mol,*** remaining compositions have TC below the room temperature;therefore,they can be used for subzero/cryogenic *** scanning electron microscopy study revealed an increase in grain size with increase in ZrO_(2)concentration and confirmed the complete solubility of ZrO_(2)in the crystal ***,low ZrO_(2)-doped BCT compositions with high d33 could be suitable for low temperature(<80°C)applications.

关键词： ZrO_(2)-doped BCT lead-free piezoelectrics high piezoelectric charge constant Curie temperature

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