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Modulating the growth of cysteine-capped cadmium sulfide quantum dots with enzymatically produced hydrogen peroxide

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Nano Research 2017年第6期10卷 1932-1941页

作者： Ruta Grinyte Javier Barroso Laura Saa Valeri pavlov Biosensing Unit CIC BiomaGUNE Parque Tecnologico de San Sebastian Paseo Miramon 182 Donostia-San Sebastian 20014 Spain

Cysteine （CSH） readily stabilizes cadmium sulfide quantum dots （CdS QDs） that grow in aqueous buffered solutions. The oxidation of CSH by hydrogen peroxide （H202） at room temperature yields cystine （CSSC）, which is less efficient in stabilizing CdS QDs compared to CSH. Herein, we demonstrate that such oxidation causes a decrease in the formation rate of CSH-capped CdS QDs from Cd^2＋ and S^2- ions. For the first time, we combined the oxidation of CSH with the glucose oxidase （GOx）-assisted biocatalytic oxidation of D-glucose, which leads to a buildup of H2O2 in the reaction mixture. The enzymatically modulated in situ growth of CdS QDs was monitored using two techniques： fluorescence spectroscopy and photoelectrochemical （PEC） analysis. This system enables quantification of GOx and glucose in human serum.

关键词： quantum dots photoelectrochemistry enzyme fluorescence hydrogen peroxide

A third superchron during the Early Paleozoic

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Episodes 2005年第2期28卷 78-84页

作者： V.pavlov Y.Gallet DepartmentoftheMainGeomagnetic.Field InstituteofPhysicsofthe.EarthMoscow：Russia／／LaboratoiredePaléomagnétismeInstitutdePhysiqueduGlobedePansFrance LaboratoiredePaléomagnétisme InstitutdePhysiqueduGlobedePansFrance

Research on geomagnetic reversal chronology has established the existence of two superchrons, one during the Cretaceous and the other (Kiaman) during the Late *** the past few years, we have performed several magnetostratigraphic studies on Early Paleozoic (Cambrian and Ordovician) sedimentary sequences from Siberia. Our results show high magnetic reversal frequencies during the Middle Cambrian. In contrast, several records show the occurrence of a -20 Myr long reversed polarity interval in the Lower and Middle Ordovician, suggesting the presence of a third superchron. We propose to give the name of “Moyero” to this new superchron; this name is attributed to the Siberian section which first yielded a complete record of this reversed polarity interval.

关键词：古生代地磁反演地质年代学白垩纪沉积序列

Experimental study of a low-pressure hybrid RF discharge

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Plasma Science and Technology 2020年第5期22卷 70-82页

作者： Elena KRALKINA Polina NEKLIUDOVA Vladimir pavlov Konstantin VAVILIN Ilya ZADIRIEV and Chen ZHAO Physical Electronics Department Faculty of PhysicsLomonosov Moscow State University119991 MoscowRussia

Experimental study of the low-pressure hybrid RF discharge with both inductive and capacitive channels was carried out. The RF power unit consists of inductor(antenna) and capacitor plates connected in parallel to the same RF power source. A separating capacitor Csepis included into the circuit between the antenna ends and the lead connected to the discharge capacitor plate in order to prevent the closing of the capacitive circuit through direct current by inductor and to control the contribution of capacitive channel to discharge sustaining. It is shown that at low power of the RF power source, power coupling to the discharge mainly occurs through the capacitive channel. Increasing the power of the RF power source increases the power coupled in the inductive channel, electron density, and current flowing through the capacitive channel. This leads to increasing voltage drop on the separating capacitor and partial cutoff of the capacitive channel. At separating capacitance values below certain value(below 50 pF in the present experiments), the self-bias of the loaded plate of the discharge capacitor becomes positive indicating that the thickness of the electrode sheath of the loaded electrode decreases compared to thickness of the sheath of the grounded electrode. The thickness of the space-charge sheath of the grounded electrode decreases with increasing power coupled to the plasma. At separating capacitance below 50 pF, higher harmonics of the RF voltage and current are actively generated in the capacitive discharge channel. Increasing the separating capacitance leads to decreasing electron density, increasing effective electron temperature and more effective RF energy coupling to plasma due to increasing relative importance of the capacitive discharge channel.

关键词： radio-frequency discharge plasma E-mode H-mode

Can incidental sighting data be used to elucidate habitat preferences and areas of suitable habitat for a cryptic species?

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Integrative Zoology 2017年第3期12卷 186-197页

作者： Wesley R.HAUSER Sigrid R.HEISE-pavlov Indiana University School of Public and Environmental AffairsBloomingtonIndianaUSA Centre for Rainforest Studies School for Field StudiesYungaburraQueenslandAustralia

The involvement of communities in ecological studies has been shown to augment conservation efforts,especially for cryptic ***,there is a lack of studies addressing the utility of incidental sighting records from community members in gaining knowledge on habitat preferences and distribution of suitable habitat for these *** study compares preferences of the Lumholtz’s tree kangaroo(Dendrolagus lumholtzi;LTK),a cryptic rainforest folivore in northeastern Australia,for various habitat and climatic variables derived from data collected during scientific projects to those derived from incidental sighting records using ArcGIS and *** sighting records suggest that the species uses a wider range of altitudes,annual rainfalls,annual mean temperatures and vegetation types than predicted by scientific *** records also show that the species can persist in areas of lower rainfall during the wettest month and lower minimum temperature during the coldest *** data place the species within a comparable range of rainfalls during the driest month,maximum temperatures of the warmest month and soil *** using identified preferences to assess the extent and distribution of suitable habitat,incidental records predicted more areas of suitable habitat than scientific records with an overlap of up to 91%between *** present study proves that incidental sighting records can be a valuable part of the study of cryptic species and should be considered complementarily alongside scientific studies to obtain comprehensive ecological information of a species that can assist in its conservation.

关键词： cryptic species Dendrolagus lumholtzi incidental sighting data habitat preferences Lumholtz’s tree kangaroo

Does shifting to professional emergency department staffing affect the decision for chest radiography?

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World Journal of Emergency Medicine 2021年第2期12卷 87-92页

作者： Marin pavlov Lucija Klobucar Iva Klobučar Kristinazgela Vesna Degoricija Department of Cardiology Sestre Milosrdnice University Hospital CentreZagreb 10000Croatia Institute of Emergency Medicine Osijek-Baranja CountyOsijek 31000Croatia University of Zagreb School of Medicine Zagreb 10000Croatia Department of Medicine Sestre milosrdnice University Hospital CentreZagreb 10000Croatia

BACKGROUND: The study aims to determine whether shifting to professional emergency department(ED) teams leads to a higher rate of radiologic ***: We retrospectively analyzed a total of 2,000 patients presenting to the ED of a tertiary teaching hospital in two time periods: group 1(G1) comprised 1,000 consecutive patients enrolled from December 21, 2012 to January 5, 2013(all patients were examined by an internal medicine specialist);group 2(G2) comprised 1,000 consecutive patients enrolled from December 21, 2018 to January 3, 2019(all patients were examined by an emergency physician).RESULTS: The chest X-ray(CXR) was performed in 40.6% of all patients. There was no difference in the frequency of CXR(38.9% in G1 vs. 42.3% in G2, P=0.152). More CXRs were performed in G2 patients older than 65 years, in female patients older than 65 years, in patients presenting during the evening and night shifts or off-hours, in patients with a history of malignancy, in patients with gastrointestinal bleeding, and in patients with bradycardia, but fewer in patients presenting with arrhythmia. No difference in the rates of pathological CXR was found(47.3% in G1 vs. 52.2% in G2, P=0.186). Compared with G2, higher sensitivity and specificity were obtained for the binary logistic regression model predicting pathological findings in ***: Shifting to professional ED teams does not increase radiologic workup. By implementing deliberate usage of ultrasound, some self-governing procedures, case-oriented investigations, and center-specific recommendations, unnecessary radiologic workup can be avoided. Professional ED teams could lead to a higher standard of emergency care.

关键词： Chest radiography Emergency department Emergency physicians Healthcare organization

The Role of Operational Innovations for Promoting Efficiency in Online Education in China

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The Role of Operational Innovations for Promoting Efficiency...

作者： Vladislav pavlov 上海交通大学

学位级别：硕士

This work tries to uncover the role and significance of innovations in Chinese online education market segment and its comparison with traditional Chinese education *** importantly the task is to reveal what can innovations do to adapt the new economic model to coexistence with the conventional model,how can it compete and potentially overcome,in terms of efficiency and *** thesis work also focuses on the obstacles of innovations implementation,as well as some tips of a better application based on the acquired research *** China has overtaken the leading positions in the size of the ecommerce market,the development of all ecommerce related industries skyrocketed in the recent years,bringing up colossal growth rates,unknown to any other country *** Ecommerce boom in China has become the foundation of an innovation – a new education business model types – ELearning,or in other words-online education business *** has become a place where the rapid growth and innovations coexist face to face with the traditions and living principles of the past *** is not an *** are now more ways for students to study and more companies and models for the market to compete *** importance of defining the role of innovations in online education is to learn its capabilities,understand why some people prefer to choose it and why not,whether they are ready for the innovative opportunities the model brings,or they want it to innovate further to improve it until deciding to try *** on the questions of ?how innovative online education companies are in China?? will give the hints of their further improvement based on what the companies lack off,what their strength over the online education market competitors and traditional approach,what their customers want to see in them.?How do education industries coexist with each other? How can they develop further? ?-Understanding the roles of innovations in both – online and co

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Accumulation of dysprosium,samarium,terbium,lanthanum,neodymium and ytterbium by Arthrospira platensis and their effects on biomass biochemical composition

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Journal of Rare Earths 2021年第9期39卷 1133-1143页

作者： Inga Zinicovscaia Liliana Cepoi Ludmila Rudi Tatiana Chiriac Dmitrii Grozdov Sergey pavlov Svetlana Djur Joint Institute for Nuclear Research 6 Joliot-Curie Str.1419890DubnaRussia Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering 30 Reactorului Str.MG-6BucharestMagureleRomania Institute of Microbiology and Biotechnology 1 Academiei Str.202&ChisinauMoldova State University "Dimitrie Cantemir"3/2 Academiei Str.2028ChisinauMoldova

The growth of Arthrospira platensis and physiological changes in biomass under the effects of six rare earth elements Dy,Sm,Tb,La,Nd and Yb were *** were tested by three concentrations of 10,20 and 30 mg/*** to neutron activation analysis data ***’s accumulation capacity toward studied elements changes in the following order of La>Dy>Nd>Sm>Yb>*** results show that Dy and La ions stimulate biomass growth and Yb ions inhibit it,while Sm,Tb and Nd ions do not affect biomass *** contents of proteins and chlorophyll a are not affected by the presence of rare earth elements in the cultivation *** elements affect to different extents carbohydrates,phycobilins,β-carotene,lipids and MDA contents in spirulina *** in the antioxidant activity under applied metal loads reveal a moderate stress in exposed *** *** can be successfully used for bioremediation of natural water contaminated with REEs as well as REEs recovery from low polluted industrial effluents.

关键词： Rare earth elements Arthrospira platensis Biochemical composition Antioxidant activity Neutron activation analysis

Characterization of inflammation and insulin resistance in high-fat diet-induced male C57BL/6J mouse model of obesity

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Animal Models and Experimental Medicine 2019年第4期2卷 252-258页

作者： Dimiter Avtanski Valentin A.pavlov Kevin J.Tracey Leonid Poretsky Lenox Hill Hospital Friedman Diabetes InstituteNorthwell HealthNew YorkNYUSA The Feinstein Institutes for Medical Research Northwell HealthManhassetNYUSA Donald and Barbara Zucker School of Medicine at Hofstra/Northwell HempsteadNYUSA

Background: Animal models of diet-induced obesity(DIO) are commonly used in medical research for mimicking human diseases. There is no universal animal model, and careful evaluation of variety of factors needs to be considered when designing new experiments. Here, we investigated the effect of 9 weeks high-fat diet(HFD) intervention, providing 60% energy from fat, on parameters of inflammation and insulin resistance in male C57 BL/6 J ***: Six weeks old mice were initiated on regular diet(RD) or HFD providing 60 kcal energy from fat for 9 weeks. Fasting blood glucose levels were measured by glucometer, and fasting plasma levels of insulin and proinflammatory cytokines by Luminex assay. Insulin sensitivity was evaluated by using QUICKI and HOMA2 ***: HFD mice showed ~ 40% higher body weight and ~ 20% larger abdominal circumference, due to an increase in the white adipose tissue mass. Liver examination revealed increased size and higher hepatic lipid accumulation in livers from HFD mice compared to their RD counterparts. Animals from the HFD group were characterized with significantly higher presence of crown-like structures(CLS) in WAT and higher plasma levels of proinflammatory cytokines(TNF-α, IL-6, leptin, MCP-1, PAI-1, and resistin). HFD-fed mice also demonstrated impaired insulin sensitivity(lower QUICKI, higher HOMA-insulin resistance(HOMA-IR), and lower HOMA-percent sensitivity(HOMA-%S)) index ***: Male C57 BL/6 J mice on 9 weeks HFD providing 60 kcal energy from fat display impaired insulin sensitivity and chronic inflammation, thus making this DIO mouse model appropriate for studies of early stages of obesity-related pathology.

关键词： diet high‐fat insulin resistance mouse model

User Interface for People with Autism Spectrum Disorders

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Journal of Software Engineering and Applications 2014年第2期7卷 128-134页

作者： Nikolay pavlov Faculty of Mathematics and Informatics Plovdiv University “Paisii Hilendaski” Plovdiv Bulgaria

This paper describes the requirements for building accessible user interface for users with autism spectrum disorders (ASD) and presents the user interface (UI) of Open Book, a reading assistive tool for people with ASD. The requirements are extracted from both existing research on improving reading comprehension for people with ASD, and from the feedback of users and clinical professionals. The findings are applied in practice to create the user interface of Open Book tool. Key screens of the user interface are presented. It is implied that the features of the UI for people with ASD can be successfully applied to improving overall accessibility of any graphical user interface.

关键词： Accessibility Accessible User Interface Users with Autism Spectrum Disorders Project FIRST