检索结果-南通市图书馆

Practical obstacles and their mitigation strategies in compressional optical coherence elastography of biological tissues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第6期10卷 51-63页

作者： vladimir Y.Zaitsev Alexandr L.Matveyev Lev A.Matveev Ekaterina v.Gubarkova Alexandr A.Sovetsky Marina A.Sirotkina Grigory v.Gelikonov Elena v.Zagaynova natalia D.Gladkova Alex vitkin Institute of Applied Physics Russian Academy of Sciences Ulyanova Street 46 Nizhny Novgorod 603950 Russia Nizhny Novgorod State Medical Academy 10/1 Minina Square Nizhny Novgorod 603005 Russia University of Toronto and University Health Network 610 University Avenue Toronto ON M5G 2M9Canada

In this paper,we point out some practical obstacles arising in realization of compressional optical coherence elastography(OCE)that have not attracted sufficient attention ***-cally,we discuss(i)complications in quantification of the Young modulus of tissues related to partial adhesion between the OCE probe and soft intervening reference layer sensor,(i)distorting influence of tisue suface curvature/corrugation on the subsurface strain distri-bution mapping,(ii)ways of signal-to-noise mtio(SNR)enhancement in OCE strain mapping when periodic averaging is not realized,and(iv)potentially significant infuence of tissue elastic nonlinearity on quantification of its *** pnactical approaches to mitigate the effects of these complications are also described.

关键词： Optical coherence elastography optical coherence tomography phase-resolved methods strain mapping stiffness characterization

Labeling of influenza viruses with synthetic fluorescent and biotin-labeled lipids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

virologica Sinica 2014年第4期29卷 199-210页

作者： natalia A Ilyushina Evgeny S Chernyy Elena Y Korchagina Aleksra S Gambaryan Stephen M Henry Nicolai v Bovin Food and Drug Administration 29 Lincoln DriveBethesda 20892 MD USA Shemyakin Institute of Bioorganic Chemistry Russian Academy of Sciences Miklukho Maklaya 16/10Moscow 117997 Russia Chumakov Institute of Poliomyelitis and viral Encephalitides Russian Academy of Medical SciencesMoscow Region 142782 Russia Biotechnology Research Institute AUT University Private Bag 92006Auckland 1142 New Zealand

Direct labeling of virus particles is a powerful tool for the visualization of virus–cell interaction events. However, this technique involves the chemical modification of viral proteins that affects viral biological properties. Here we describe an alternative approach of influenza virus labeling that utilizes Function-Spacer-Lipid(FSL) constructs that can be gently inserted into the virus membrane. We assessed whether labeling with fluorescent(fluo-Ad-DOPE) or biotin-labeled(biot-CMG2-DOPE) probes has any deleterious effect on influenza virus hemagglutinin(HA) receptor specificity, neuraminidase(NA) activity, or replicative ability in vitro. Our data clearly show that neither construct significantly affected influenza virus infectivity or viral affinity to sialyl receptors. Neither construct influenced the NA activities of the influenza viruses tested, except the A/Puerto Rico/8/34(H1N1) strain. Our data indicate that lipid labeling provides a powerful tool to analyze influenza virus infection in vitro.

关键词： bioimaging Function-Spacer-Lipid (FSL) constructs labeling of influenza viruses synthetic lipids

Characterization of cerebral blood flow dynamics with multiscale entropy

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第5期10卷 85-93页

作者： Alexey N.Pavlov Arkady S.Abdurashitov Olga N.Pavlova Maria v.Ulanova Anastasia A.Bodrova natalia A.Shushunova Alexander P.Khorovodov Oxana v.Semyachkina-Glushkovskaya Yuri Gagarin State Technical University of Saratov 77 Politechnicheskaya Street Saratov 410054Russia Saratov National Research State University 83 Astrakhanskaya Street Saratov 410012Russia

Based on the laser speckle contrast imaging(LSCI)and the multiscale entropy(MSE),we study in this work the blood flow dynamics at the levels of cerebral veins and the surrounding network of microcerebral *** discuss how the phenylephrine-related acute peripheral bypertension is refected in the cerebral circulation and show that the observed changes are scale dependent,and they are signifcantly more pronounced in microcerebral vessels,while the macrocerebral dynamics does not demonstrate authentic inter-group *** also consider the permeability of blood-brain barrier(BBB)and study its opening caused by sound *** show that alterations associated with the BBB opening can be revealed by the analysis of blood flow at the level of macrocerebral vessels.

关键词： Cerebral blood flow laser speckle contrast imaging arterial pressure complexity

Collagen scaffolds functionalized with triple-helical peptides support 3D HUvEC culture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2020年第5期7卷 471-482页

作者： Jean-Daniel Malcor Emma J.Hunter natalia Davidenko Daniel v.Bax Ruth Cameron Serena Best Sanjay Sinha Richard W.Farndale Department of Biochemistry University of CambridgeCambridge CB21QWUK Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK Division of Medicine and Wellcome Trust Medical Research Council Cambridge Stem Cell InstituteUniversity of CambridgeCambridge CB20AWUK Present address:CambCol Laboratories Ltd Oak Lane Business ParkLittleportElyCambridgeshireCB79RPUK

Porous biomaterials which provide a structural and biological support for cells have immense potential in tissue engineering and cell-based therapies for tissue *** biomaterials that can host endothelial cells represent promising tools for the vascularization of engineered ***-dimensional collagen scaffolds possessing controlled architecture and mechanical stiffness are obtained through freeze–drying of collagen suspensions,followed by chemical cross-linking which maintains their ***,cross-linking scaffolds renders their biological activity suboptimal for many cell types,including human umbilical vein endothelial cells(HUvECs),by inhibiting cell–collagen ***,we have improved crucial HUvEC interactions with such cross-linked collagen biomaterials by covalently coupling combinations of triple-helical peptides(THPs).These are ligands for collagen-binding cell-surface receptors(integrins or discoidin domain receptors)or secreted proteins(SPARC and von Willebrand factor).THPs enhanced HUvEC adhesion,spreading and proliferation on 2D collagen *** grafted to 3D-cross-linked collagen scaffolds promoted cell survival over seven *** study demonstrates that THP-functionalized collagen scaffolds are promising candidates for hosting endothelial cells with potential for the production of vascularized engineered tissues in regenerative medicine applications.

关键词： collagen biomaterial endothelial cells 3D cell scaffold collagen-mimetic peptides

Phylogeny of Brucella abortus strains isolated in the Russian Federation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2021年第7期14卷 323-329页

作者： Dmitry A.Kovalev Dmitriy G.Ponomarenko Sergey v.Pisarenko Nikolay A.Shapakov Anna A.Khachaturova natalia S.Serdyuk Olga v.Bobrysheva Alexander N.Kulichenko Stavropol Research Anti-Plague Institute 355035StavropolRussian Federation

Objective: To study Brucella(B.) abortus strains isolated in the Russian Federation, in order to identify their detailed position in the phylogenetic structure of the species global population as well as to determine genetic relationships for isolates from different geographical ***: Based on Bayesian method, the whole genome singlenucleotide polymorphism(SNP) analysis of 258 B. abortus strains from different geographical areas of the world including 20 B. abortus strains isolated in Russia was carried out. Results: The core genome SNP analysis of the B. abortus isolates allowed describing the main genetic lineages. The Russian strains entered two separate clades, including the basal branch and the C1 branch that is widely spread in Eurasia. The data on the isolation time was used for the dating of phylogenetic tree, and also the estimated time frame for the B. abortus genotype diversification was determined. There were sets of specific SNPs identified, which defined each of the genotypes and ***: A significant genetic diversity of the brucellosis pathogen strains from Russia has been proven. The sets of unique specific SNPs described in our study may become one of the elements within a bio-informational analysis algorithm to be used for epidemiological study of brucellosis outbreaks, including those caused by new(atypical) genetic variants of B. abortus.

关键词： Brucella abortus Phylogeny Evolution Genome SNP

Increased paracellular permeability of tumor-adjacent areas in 1,2-dimethylhydrazine-induced colon carcinogenesis in rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2018年第3期15卷 251-259页

作者： viktoria v.Bekusova Evgeny L.Falchuk Larisa S.Okorokova natalia M.Kruglova AlexANDer D.Nozdrachev AlexANDer G.Markov Department of Physiology St.Petersburg State University I.P.Pavlov Institute of Physiology Russian Academy of Sciences

Objective: The morphology and functions of the proximal and distal large intestine are not the same. The incidence of colorectal cancer in these regions is also different, as tumors more often appear in the descending colon than in the ascending *** bowel disease and colorectal cancer can increase transepithelial permeability, which is a sign of reduced intestinal barrier function. However, there is not enough evidence to establish a connection between the difference in colorectal cancer incidence in the proximal and distal colon and intestinal permeability or the effects of carcinogenesis on the barrier properties in various areas of the colon. The aim of the study was to assess the permeability of different segments of the large intestine according to a developed mapping methodology in healthy rats and rats with 1,2-dimethylhydrazine(DMH)-induced colon ***: The short circuit current, the transepithelial electrical resistance and the paracellular permeability to fluorescein of large intestine wall of male Wistar rats were examined in the Ussing chambers. The optical density of the solution from the serosa side to assess the concentration of the diffused fluorescein from mucosa to serosa was analyzed by spectrophotometry. The morphometric and histological studies were performed by optical ***: Rats with DMH-induced colon adenocarcinomas showed elevated transepithelial electrical resistance in the areas of neoplasm development. In contrast, there was no change in the electrophysiological properties of tumor adjacent areas, however,the paracellular permeability of these areas to fluorescein was increased compared to the control rats and was characterized by sharply reduced barrier ***: The barrier properties of the colon vary depending on tumor location. The tumors were less permeable than the intact intestinal wall and probably have a negative influence on tumor-adjacent tissues by disrupting their bar

关键词： Rat 1,2-dimethylhydrazine colorectal cancer Ussing chamber short circuit current transepithelial electrical resistance intestinal permeability

Low-FODMAP diet reduces irritable bowel symptoms in patients with inflammatory bowel disease

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第18期23卷 3356-3366页

作者： natalia Pedersen Dorit vedel Ankersen Maria Felding Henrik Wachmann Zsuzsanna végh Line Molzen Johan Burisch Jens Rikardt Andersen Pia Munkholm Department of Gastroenterology Slagelse Hospital Gastroenterology Unit North Zealand Hospital Department of Nutrition Exercise and SportsUniversity of Copenhagen Department of Statistics First Department of Medicine Semmelweis University

To investigate the effect of a low-FODMAP diet on irritable bowel syndrome (IBS)-like symptoms in patients with inflammatory bowel disease (IBD).METHODSThis was a randomised controlled open-label trial of patients with IBD in remission or with mild-to-moderate disease and coexisting IBS-like symptoms (Rome III) randomly assigned to a Low-FODMAP diet (LFD) or a normal diet (ND) for 6 wk between June 2012 and December 2013. Patients completed the IBS symptom severity system (IBS-SSS) and short IBD quality of life questionnaire (SIBDQ) at weeks 0 and 6. The primary end-point was response rates (at least 50-point reduction) in IBS-SSS at week 6 between groups; secondary end-point was the impact on quality of ***-nine patients, 67 (75%) women, median age 40, range 20-70 years were randomised: 44 to LFD group and 45 to ND, from which 78 patients completed the study period and were included in the final analysis (37 LFD and 41 ND). There was a significantly larger proportion of responders in the LFD group (n = 30, 81%) than in the ND group (n = 19, 46%); (OR = 5.30; 95%CI: 1.81-15.55, P ve study, a low-FODMAP diet reduced IBS-like symptoms and increased quality of life in patients with IBD in remission.

关键词： Inflammatory bowel disease Web-based management Irritable bowel syndrome Low-FODMAP diet

Circle of life:the common hamster(Cricetus cricetus)adaptations to the urban environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2019年第4期14卷 383-395页

作者： Alexey v.SUROv Elena A.ZAYTSEvA Alexandr v.KUPTSOv Elena A.KATZMAN Pavel L.BOGOMOLOv Alexandra S.SAYAN Ekaterina v.POTASHNIKOvA Nikolay N.TOvPINETZ Ekaterina v.KUZNETSOvA Alexey Y.TSELLARIUS natalia Y.FEOKTISTOvA Severtsov Institute of Ecology and Evolution Russian Academy of SciencesMoscowRussia Centre of Hygiene and Epidemiology in Crimea and in the Municipal City Sevastopol SimferopolRussia

Traditionally,urbanization has been seen as a negative phenomenon for ***,changes in the environmental parameters induced by urbanization might be favorable for some *** the past half-century,the common hamster has actively populated cities,establishing populations in some European,Russian and Kazakhstan *** on integrative methods,we investigated free-range common hamsters inhabiting Simferopol from 2015 to 2018 to reveal possible adaptations to the urbanized environment across several parameters,including lifespan,hibernation period,reproductive activity and body *** show that in urban areas,the common hamster demonstrates an extremely short hibernation period compared to other localities,possibly due to enhanced food resources from urban forestry(walnuts,locus and hazelnut),allowing the species to start breeding very early(February)and finish as late as *** present the first evidence of polyandry for this species:mating of receptive females with several males and subsequent confirmation of multiple *** high reproductive potential,the lifespan of the common hamster in urban conditions is generally very short(less than 1 year).We speculate that in the process of synurbization,the common hamster’s innate plasticity across many life history traits permits it to successfully colonize throughout a wide range of habitats,with the ability to form novel adaptations to urban environments.

关键词： body mass hibernation lifespan multiple paternity synurbization

3,6-bis(2,2,2-trinitroethylnitramino)-1,2,4,*** and energy abilities as a component of solid composite propellants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第7期18卷 1148-1155页

作者： Anatoly G.Korepin natalia M.Glushakova David B.Lempert Anatoly I.Kazakov Gennady v.Shilov Denis v.Korchagin vadim M.volokhov Elena S.Amosova Sergey M.Aldoshin Institute of Problems of Chemical Physics Ac.Semenov Avenue 1Chernogolovka142432Russian Federation

The work addresses to the study of the molecular and crystal structure and properties of a new energyintensive compound 3,6-bis(2,2,2-trinitroethylnitramino)-1,2,4,5-tetrazine(NBTAT),first obtained by the authors in *** compound crystallizes in the monoclinic system,space group P2(1)/n,density at room temperature 1.939 g/cm^(3).The energies of crystal packing and pairwise intermolecular interactions in NBTAT and its unnitrated analogue BTAT were calculated,and their comparative analysis was carried *** enthalpy of formation of NBTAT molecules was calculated by quantum-chemical methods using Gaussian 09,and the enthalpy of formation of NBTAT in the solid phase(618 kJ/mol)was *** energy capabilities of NBTAT as an oxidizer of solid composite propellants are *** is shown that in metal-free compositions NBTAT is significantly superior to ammonium perchlorate(AP),dinitramide ammonium salt(ADN),HMX,BTAT at all stages of rocket systems,and is comparable to the superdense CL-20 yielding to the latter at the lower stages and slightly winning at the upper stages.

关键词： Nitrogen heterocycles Quantum chemistry Enthalpy of formation 3,6-bis(2,2,2-trinitroethylnitramino)-1,2,4,5-tetrazine Crystal structure Energetic ability