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A Pt/Mnv_(2)O_(6) nanocomposite for the borohydride oxidation reaction

Journal of Energy Chemistry 2021年第4期30卷 428-436页

作者： Jadranka Milikic Marta martins Ana S.Dobrota Gamze Bozkurt Gulin S.P.Soylu Ayse B.Yurtcan Natalia v.Skorodumova Igor A.Pasti Biljana Sljukic Diogo M.F.Santos Faculty of Physical Chemistry University of BelgradeStudentski trg 12-1611158 BelgradeSerbia CeFEMA Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal Project Coordination Implementation and Research Center Erzurum Technical UniversityErzurumTurkey Faculty of Engineering Chemical Engineering DepartmentIstanbul University-Cerrahpasa34320 AvcilarIstanbulTurkey Department of Chemical Engineering Atatürk UniversityErzurumTurkey Department of Materials Science and Engineering School of Industrial Engineering and ManagementKTH-Royal Institute of TechnologyBrinellvägen 2310044 StockholmSweden Department of Physics and Astronomy Uppsala UniversityBox 51675120 UppsalaSweden

Problems associated with carbon support corrosion under operating fuel cell conditions require the identification of alternative supports for platinum-based nanosized *** supported on manganese vanadate(Pt/Mnv_(2)O_(6))was prepared by microwave irradiation method and characterized using X-ray diffraction,Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy with energy dispersive spectroscopy,and transmission electron *** borohydride oxidation reaction(BOR)on Pt/Mnv_(2)O_(6) was studied in highly alkaline media using voltammetry,chronoamperometry,and electrochemical impedance *** electrocatalytic activity of Pt/Mnv_(2)O_(6) was also compared with that of commercial Pt/C(46 wt%Pt)*** apparent activation energy of BOR at Pt/Mnv_(2)O_(6) was estimated to be 32 k J mol^(-1) and the order of reaction to be 0.51,indicating that borohydride hydrolysis proceeds in parallel with its ***-term stability of Pt/Mnv_(2)O_(6) under BOR typical conditions was observed.A laboratory-scale direct borohydride fuel cell assembled with a Pt/Mnv_(2)O_(6) anode reached a specific power of 274 W g^(-1).Experimental results on Pt/Mnv_(2)O_(6) were complemented by DFT calculations,which indicated good adherence of Pt to Mnv_(2)O_(6),beneficial for electrocatalyst stability.

关键词： Borohydride oxidation reaction Platinum-based electrocatalyst Manganese vanadate Density functional theory

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Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants

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Journal of Integrative Plant Biology 2016年第8期58卷 737-748页

作者： Yugo Lima-Melo Fabricio E.L.Carvalho Márcio O.martins Gisele Passaia Rachel H.v.Sousa Milton C.Lima Neto Márcia Margis-Pinheiro Joaquim A.G.Silveira Department of Biochemistry and Molecular Biology Federal University of Ceará Department of Genetics Federal University of Rio Grande do Sul

The physiological role of plant mitochondrial glutathione peroxidases is scarcely known. This study attempted to elucidate the role of a rice mitochondrial isoform（GPX1） in photosynthesis under normal growth and salinity conditions. GPX1 knockdown rice lines（GPX1s） were tested in absence and presence of 100 mM NaCl for 6 *** reduction of GPX1 s line under non-stressful conditions, compared with non-transformed（NT） plants occurred in parallel to increased H_2O_2 and decreased GSH contents. These changes occurred concurrently with photosynthesis impairment, particularly in Calvin cycle＇s reactions, since photochemical efficiency did not ***, GPX1 silencing and downstream molecular/metabolic changes modulated photosynthesis differentially. In contrast, salinity induced reduction in both phases of photosynthesis, which were more impaired in silenced *** changes were associated with root morphology alterations but not shoot growth. Both studied lines displayed increased GPX activity but H_2O_2 content did not change in response to salinity. Transformed plants exhibited lower photorespiration, water use efficiency and root growth, indicating that GPX1 could be important to salt tolerance. Growth reduction of GPX1 s line might be related to photosynthesis impairment, which in turn could have involved a cross talk mechanism between mitochondria and chloroplast originated from redox changes due to GPX1 deficiency.

关键词： CO2 assimilation glutathione peroxidase Oryza sativa photochemistry redox homeostasis

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Transparent conductive oxide-gated silicon microring with extreme resonance wavelength tunability

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Photonics Research 2019年第4期7卷 473-477页

作者： ERWEN LI BEHZAD ASHRAFI nia BOKUN ZHOU ALAN X.WANG School of Electrical Engineering and Computer Science Oregon State University

Transparent conductive oxides have attracted escalating research interest for integrated photonic devices and metasurfaces due to the extremely large electro-optic modulation of the refractive index by the free-carrier-induced plasma dispersion effect. In this paper, we have designed and fabricated a silicon microring resonator using an indium-tin oxide gate as the electric-tuning electrode. It achieved an ultralarge resonance wavelength tunability of 271 pm/v, which is obtained through the reduced width of the ring waveguide and a high-dielectric-constant Hf O2 insulator. We demonstrated a broad resonance wavelength tuning range of over 2 nm with an ultrafast response time of less than 12 ns and near-zero static power consumption, which outperforms traditional thermal tuning.

关键词： Transparent conductive attracted escalating refractive index

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Cytogenetic Investigation in Patients with Clinical Suspicion of Genetic Syndrome in Manaus, Brazil

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Journal of Pharmacy and Pharmacology 2022年第3期10卷 72-78页

作者： Débora Pinto Denise Corrêa Benzaquem Rachel Cardoso Nunes v.nia Mesquita Gadelha Prazeres Cleiton Fantin Hospital Universitário Getúlio vargas ManausAmazonas 69020-170Brasil Human Genetics Laboratory State University of AmazonasManausAmazonas 69065-001Brazil Federal University of Amazonas.Manaus Amazonas 69067-005Brazil

Chromosomal alterations can cause a number of diseases;therefore,early detection of these alterations is fundamental in the prevention and treatment of various *** this sense,the objective of this study was to perform cytogenetic analysis of patients with phenotypic characteristics not yet clarified in order to determine the frequency of chromosomal alterations in patients treated in the public health system in Manaus,Brazil.A total of 98 patients with clinical suspicion of genetic syndrome were referred to the public health system in Manaus,Amazonas *** analyses were performed from lymphocyte culture and subsequent *** data were obtained through referral files and chromosomal a *** the 98 karyotypes analyzed,65(66.3%)presented normal karyotype,18(18.4%)presented chromosomal alterations and 15(15.3%)were *** the alterations found,11(61.1%)corresponded to alterations of the numerical type and 7(38.9%)of the structural *** the chromosomal alterations identified,the one with the highest frequency was aneuploidy,which was significantly represented by 9 patients with Down’s syndrome,and different karyotypic mechanisms related to this syndrome were *** was also one case of deletion,one case of pericentric inversion,and two involving the sex *** etiological confirmation of congenital anomalies is extremely important for the patient’s prognosis,and it is necessary to invest in cytomolecular tests,such as FISH and microarray in order to increase the rate of diagnosis.

关键词： Karyotype chromosomes banding karyotypic formula Down’s syndrome

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Epidermal growth factor receptor rs17337023 polymorphism in hypertensive gestational diabetic women: A pilot study

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World Journal of Diabetes 2019年第7期10卷 396-402页

作者： Russell S martins Taimur Ahmed Sabah Farhat Sana Shahid Syeda Sadia Fatima Medical College Aga Khan UniversityKarachiSindh 74800Pakistan Department of Biological and Biomedical Sciences Aga Khan UniversityKarachiSindh 74800Pakistan Department of Physiology Sir Syed Medical College for GirlsKarachiPakistan

BACKGROUND Women with gestational diabetes mellitus have an increased risk of developing gestational hypertension,which can increase fetal and neonatal morbidity and *** the past decade,single nucleotide polymorphisms in several genes have been identified as risk factors for development of gestational *** epidermal growth factor receptor activates tyrosine kinase mediated blood vessels contractility;and inflammatory *** in these mechanism are known to contribute towards *** is thus plausible that polymorphisms in the epidermal growth factor receptor gene would be associated with the development of hypertension in women with gestational *** To determine whether the epidermal growth factor receptor rs17337023 SNP is associated with the occurrence of hypertension in gestational diabetic *** This pilot case-control study was conducted at two tertiary care hospitals in Karachi,from January 2017-August *** hundred and two women at 28 week of gestation with gestational diabetes were recruited and classified into normotensive(n=80)and hypertensive(n=122)*** blood samples were genotyped for epidermal growth factor receptor polymorphism rs17337023 using tetra-ARMS polymerase chain *** analysis was applied on baseline *** data was analyzed for genotype and allele frequency determination using chi-squared *** all cases,a P value ofved in relation to age of the study subjects(P>0.05).Body fat percentage was significantly higher in hypertensive females as compared to normotensive subjects(35.138±4.29 Case vs 25.01±8.28 Control;Pve group than the normotensive group(Pverall epidermal growth factor receptor rs17337023 polymorphism genotype frequen

关键词： Gestational diabetes mellitus Gestational hypertension Epidermal growth factor receptor rs17337023 Single nucleotide polymorphism Polymorphism Casecontrol

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Role of aryl hydrocarbon receptor in mesenchymal stromal cell activation:A minireview

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World Journal of Stem Cells 2017年第9期9卷 152-158页

作者： Danilo Candido de Almeida Laura Sibele martins Evangelista Niels Olsen Saraiva Camara Department of Medicine Nephrology DivisionFederal University of Sao Paulo Department of Immunology Institute of Biomedical ScienceUniversity of Sao Paulo

Mesenchymal stromal cells(MSCs) possess great therapeutic advantages due to their ability to produce a diverse array of trophic/growth factors related to cytoprotection and *** activation via specific receptors is a crucial event for these cells to exert their immunosuppressive *** aryl-hydrocarbon receptor(Ah R) is a sensitive molecule for external signals and it is expressed in MSCs and,upon positive activation,may potentially regulate the MSC-associated immunomodulatory ***,signalling pathways linked to Ah R activation can elucidate some of the molecular cascades involved in MSC-mediated *** this minireview,we have noted some important findings concerning MSC regulation via Ah R,highlighting that its activation is associated with improvement in migration and immunoregulation,as well as an increase in pro-regenerative ***,Ah R-mediated MSC activation can contribute to new perspectives on MSC-based therapies,particularly those directed at immune-associated disorders.

关键词： Mesenchymal stromal cells Aryl-hydrocarbon receptor Cell activation and immunosuppression

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Therapeutics administered during ex vivo liver machine perfusion:An overview

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World Journal of Transplantation 2020年第1期10卷 1-I0001页

作者： Julianna E Buchwald Jing Xu Adel Bozorgzadeh Paulo N martins Division of Transplantation Department of Surgery University of Massachusetts Medical School

Although the use of extended criteria donors has increased the pool of available livers for transplant,it has also introduced the need to develop improved methods of protection against ischemia-reperfusion injury(IRI),as these"marginal"organs are particularly vulnerable to IRI during the process of procurement,preservation,surgery,and *** this review,we explore the current basic science research investigating therapeutics administered during ex vivo liver machine perfusion aimed at mitigating the effects of IRI in the liver transplantation *** various categories of therapeutics are utilized during the perfusion process and include invoking the RNA interference pathway,utilizing defatting cocktails,and administering classes of agents such as vasodilators,anti-inflammatory drugs,human liver stem cell-derived extracellular vesicles,and δ-opioid agonists in order to reduce the damage of *** vivo machine perfusion is an attractive alternative to static cold storage due to its ability to continuously perfuse the organ,effectively deliver substrates and oxygen required for cellular metabolism,therapeutically administer pharmacological or cytoprotective agents,and continuously monitor organ viability during *** use of administered therapeutics during machine liver perfusion has demonstrated promising results in basic science *** novel therapeutic approaches to combat IRI are being developed through basic science research,their use in clinical medicine and treatment in patients for liver transplantation has yet to be explored.

关键词： Therapeutics Liver transplantation Ex vivo machine perfusion Ischemia reperfusion injury Organ preservation Extended criteria donors

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Impact of technology use in type 2 diabetes distress:A systematic review

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World Journal of Diabetes 2020年第10期11卷 459-467页

作者： Patricia vieira Renata Kobayasi Filomena Pereira Isabella martins Zaia Sandra Umeda Sasaki Department of Health Iron SaúdeAlcabideche 2649-517Portugal Department of Internal Medicine University of Sao PauloSao Paulo 05410-020Brazil School of Psychology and Science of Education University of PortoPorto 4200-465Portugal Medical School UNICID Sao Paulo 03071-000Brazil

BACKGROUND Diabetes distress is an important factor in treatment outcomes and results in poor behavioral and biological *** has been used in management programs of diabetes to improve communication between patients and health care providers and to promote education about the disease and its psychological aspects,which can impact the self-efficacy of the ***,the true impact of technological approaches on the management of type 2 diabetes distress remains *** To investigate the effectiveness of technology interventions on the management of type 2 diabetes *** Studies published from 2014 to 2019 were searched in five databases:MEDLINE,PubMed,Library and Information Science Source,Academic Search Ultimate and *** Boolean logic search terms were:(1)T2Diabetes;(2)diabetes distress;and(3)technology OR mobile OR phone OR application OR *** also systematically searched the reference lists of the included studies and relevant *** controlled trials with technology interventions,type 2 diabetes patients and diabetes distress as the outcome were *** Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement was *** Of the 88 studies selected,nine full articles met the inclusion criteria and were subjected to final careful *** the JADAD scale,one article was classified as having poor quality and eight as having good *** out of nine articles showed that technology interventions had a positive impact on diabetes distress scale scores when compared with the initial *** the six articles,five showed a greater reduction in the diabetes distress scores from control ***-based interventions had good results when users received personalized feedback and routine caregiver support and *** Technology interventions can contribute positively to the management of type 2 diabetes distress,especially with a tailored appro

关键词： Technology Type 2 diabetes Diabetes distress Healthcare Systematic review

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Colorectal cancer screening:A review of current knowledge and progress in research

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World Journal of Gastrointestinal Oncology 2024年第4期16卷 1119-1133页

作者： Sara Ramos Lopes Claudio martins Inês Costa Santos Madalena Teixeira Élia Gamito Ana Luisa Alves Department of Gastroenterology Centro Hospitalar de SetúbalSetúbal 2910-446Portugal

Colorectal cancer(CRC)is one of the most prevalent malignancies worldwide,being the third most commonly diagnosed malignancy and the second leading cause of cancer-related deaths *** the progress in screening,early diagnosis,and treatment,approximately 20%-25%of CRC patients still present with metastatic disease at the time of their initial ***,the burden of disease is still expected to increase,especially in individuals younger than 50 years old,among whom early-onset CRC incidence has been *** and early detection are pivotal to improve CRC-related *** is well established that CRC screening not only reduces incidence,but also decreases deaths from *** screening strategies have proven effective in decreasing both CRC incidence and mortality,though variations in efficacy have been reported across the ***,uncertainties persist regarding the optimal screening method,age intervals and ***,adherence to CRC screening remains globally *** recent years,emerging technologies,notably artificial intelligence,and non-invasive biomarkers,have been developed to overcome these ***,controversy exists over the actual impact of some of the new discoveries on CRC-related outcomes and how to effectively integrate them into daily *** this review,we aim to cover the current evidence surrounding CRC *** will further critically assess novel approaches under investigation,in an effort to differentiate promising inno-vations from mere novelties.

关键词： Colorectal cancer Screening Review Oncology Artificial intelligence

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Effects of N-acetylcysteine on growth,viability and reactive oxygen species levels in small antral follicles cultured in vitro

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Asian pacific Journal of Reproduction 2023年第1期12卷 42-48页

作者： Efigênia B.Cordeiro Bianca R.Silva Laís R.F.M.Paulino Pedro A.A.Barroso Laryssa G.Barrozo Miguel F.de Lima Neto JoséR.v.Silva Laboratory of Biotechnology and Physiology of Reproduction Federal University of CearaAv.Comandante Maurocélio Rocha Ponte 10062041-040SobralCEBrazil

Objective:To investigate the effects of different concentrations of N-acetylcysteine on follicular growth and morphology,as well as on viability,levels of reactive oxygen species(ROS)and meiotic progression of oocytes from in vitro cultured bovine early antral ***:Isolated early antral follicles(about 500μm)were cultured in TCM-199+alone or supplemented with 1.0,5.0 or 25.0 mM N-acetylcysteine at 38.5℃with 5%CO_(2) for 8 *** diameters were evaluated at day 0,4 and 8 of *** the end of culture,the levels of ROS,chromatin configuration and viability(calcein-AM and ethidium homodimer-1 staining)were investigated in the cumulus-oocyte *** of follicle diameters between treatments were *** on percentages of morphologically normal follicles,growth rates and chromatin configuration in different treatments were ***:An increase in follicular diameters after culture in all treatments was observed,except for follicles cultured with 25.0 mM *** microscopy showed that oocytes cultured in all treatments were stained positively with calcein AM,and that 5.0 mM N-acetylcysteine reduced fluorescence for ethidium *** levels of ROS in oocytes from follicles cultured with 1.0 mM N-acetylcysteine showed a significant reduction compared to other *** presence of N-acetylcysteine in culture medium did not influence the rates of oocyte at the germinal vesicle ***:N-acetylcysteine at concentrations of 1.0 and 5.0 mM reduces ROS levels and staining for ethidium homodimer-1 in in vitro cultured follicles,respectively,while 25.0 mM N-acetylcysteine decreases follicular growth and the percentages of continuously growing follicles.

关键词： Antioxidant N-acetylcysteine Antral follicles Bovine Reactive oxygen species

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