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Covalently Bonded Ni Sites in Black Phosphorene with Electron Redistribution for Efficient metal‑Lightweighted Water Electrolysis

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Nano-micro Letters 2024年第6期16卷 233-245页

作者： Wenfang Zhai Ya Chen Yaoda Liu Yuanyuan ma Paranthaman vijayakumar Yuanbin Qin Yongquan Qu Zhengfei Dai State Key Laboratory for mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China SSN Research Centre SSN College of EngineeringChennaiTamil Nadu 603110India

The metal-lightweighted electrocatalysts for water splitting are highly desired for sustainable and economic hydrogen energy deployments,but *** this work,a low-content Ni-functionalized approach triggers the high capability of black phosphorene(BP)with hydrogen and oxygen evolution reaction(HER/OER)*** a facile in situ electro-exfoliation route,the ionized Ni sites are covalently functionalized in BP nanosheets with electron redistribution and controllable metal *** is found that the as-fabricated Ni-BP electrocatalysts can drive the water splitting with much enhanced HER and OER *** 1.0 m KOH electrolyte,the optimized 1.5 wt%Nifunctionalized BP nanosheets have readily achieved low overpotentials of 136 mV for HER and 230 mV for OER at 10 mA cm^(−2).moreover,the covalently bonding between Ni and P has also strengthened the catalytic stability of the Ni-functionalized BP electrocatalyst,stably delivering the overall water splitting for 50 h at 20 mA cm^(−2).Theoretical calculations have revealed that Ni–P covalent binding can regulate the electronic structure and optimize the reaction energy barrier to improve the catalytic activity *** work confirms that Ni-functionalized BP is a suitable candidate for electrocatalytic overall water splitting,and provides effective strategies for constructing metal-lightweighted economic electrocatalysts.

关键词： Black phosphorus Water electrolysis Electrocatalyst Electron redistribution Covalent functionalization

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Antimicrobial and antiproliferative prospective of kosinostatin-a secondary metabolite isolated from Streptomyces sp.

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Journal of Pharmaceutical Analysis 2015年第6期5卷 378-382页

作者： Vinayagam Rambabu Subramaniyan Suba Suburamaniyan vijayakumar P.G. and Research Department of Botany and microbiology A.V.V.M. Sri Pushpam College (Autonomous) K.K Biotec Lab Service

Cancer is a communal health hazard worldwide. The present investigation attempts to evaluate anti- microbial and anticancer potential of kosinostatin on mammary carcinoma cell line （mCF-7）. The anticancer and antiproliferative activities of kosinostatin were analyzed on mCF cell line by mTT assay and cytotoxicity assays like lactate dehydrogenase （LDH） and glutathione （GSH）. The secondary metabolite kosinostatin exhibited its apoptotic nature by expressing p53 protein. Collectively, the results acquired from this study promise that kosinostatin shows the potent anticancer activity.

关键词： Kosinostatin Secondary metabolite Streptomyces sp. Cytotoxic activity mCF-7

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Effect of Flow Field Geometry on Hydrodynamics of Flow in Redox Flow Battery

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Energy Engineering 2022年第1期119卷 201-217页

作者： m.Narendra Kumar S.manoj Kumar G.C.vijayakumar K.Kadirgama m.Samykano Krishna Venkatesh H.B.murlidhara Center for Incubation Innovation Research and Consultancy(CIIRC)Jyothy Institute of TechnologyBangalore560082KarnatakaIndia Department of mechanical Engineering Jyothy Institute of TechnologyBangalore560082KarnatakaIndia Faculty of mechanical and Automotive Engineering Technology University Malaysia PahangPahang26600Malaysia Centre for Automotive Engineering Universiti Malaysia PahangPahang26600Malaysia College of Engineering Universiti Malaysia PahangPahang26600Malaysia

This study computationally investigates the hydrodynamics of different serpentine flow field designs for redox flow batteries,which considers the Poiseuille flow in the flow channel and the Darcy flow porous *** Fluid Dynamics(CFD)results of the in-house developed code based on Finite Volume method(FVm)for conventional serpentine flow field(CSFF)agreed well with those obtained via *** deviation for pressure drop(ΔP)was less than 5.1%for all the flow rates,thus proving the present CFD analysis’s validity on the modified variation of serpentine flow *** serpentine flow field-2(mSFF2)design provided least pressure drop across the channel and maximum velocity penetration across the porous substrate when compared to the other *** increases its wetting ability,which is very important in terms of mass transfer over potential for electrochemical reaction happening in the porous substrate to achieve effective electrochemical cell performance.

关键词： Pressure drop velocity distribution serpentine flow field porous substrate redox flow battery

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Synthesis of metallic Nanoparticles Based on Green Chemistry and Their medical Biochemical Applications:Synthesis of metallic Nanoparticles

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Journal of Renewable materials 2023年第6期11卷 2575-2591页

作者： Kakudji Kisimba Anand Krishnan mbuso Faya Kahumba Byanga Kabange Kasumbwe Kaliyapillai vijayakumar Ram Prasad Department of Pharmaceutical Sciences University of Kwazulu-NatalPrivate Bag X54001DurbanSouth Africa Department of Chemical Pathology School of PathologyFaculty of Health SciencesUniversity of the Free StateBloemfonteinSouth Africa Faculty of Pharmaceutical Sciences University of LubumbashiLubumbashiDemocratic Republic of Congo Department of Biotechnology and Food Sciences Durban University of TechnologyDurbanSouth Africa Department of Chemistry M.Kumarasamy College of EngineeringKarurTamilnaduIndia Department of Botany Mahatma Gandhi Central UniversityMotihariBiharIndia

Nanoparticles have distinct properties that make them potentially valuable in a variety of *** a result,emerging approaches for the manufacture of nanoparticles are gaining a lot of scientific *** biological pathway of nanoparticle synthesis has been suggested as an effective,affordable,and environmentally safe *** of nanoparticles through physical and chemical processes uses unsafe materials,expensive equipment and adversely affects the *** a result,in order to support the increased utilization of nanoparticles across many sectors,nanotechnology research activities have shifted toward environmentally safe and cost-effective techniques that outperform chemical and/or biological *** use of organisms to produce metal nanoparticles is among the most frequently discussed *** appear to be the best candidates among these organisms for large-scale nanoparticle *** plants have been employed as reducing agents and NP stabilizers to minimize the toxicity of NPs in both the environment and the human ***,the presence of certain functional components in plant extracts may be extremely useful and effective for the human ***,for example,which may have antioxidant properties,might intercept free radicals before they interact with other biomolecules and cause considerable *** current article analyzes the most recent developments and improvements in the green synthesis of metal nanoparticles by different plants and the use of these nanoparticles for various biomedical applications and hopes to provide insights into this exciting research frontier.

关键词： Biosynthesis nanoparticles antimicrobial anticancer antioxidant medicinal plants

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Biogenesis of TiO_(2) nanoparticles:An approach to prove multidisciplinary application

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Green Synthesis and Catalysis 2022年第2期3卷 150-155页

作者： W.Sherine Victor S.vijayakumar E.Vidhya V.N.Punitha m.Nilavukkarasi PG and Research Department of Botany AVVM Sri Pushpam CollegePoondi(Affiliated to Bharadhidasan University)Thanjavur 613503India Department of Nanotechnology Noorul Islam Centre for Higher EducationKumarakoilKanyakumari 629180India

Nanomaterials with countless potential applications in the Natural Science and Clinical Pharmaceutics have offered the prospects of developing new *** analysis of green TiO_(2) nanoparticles synthesized with Limonia acidissima(***)aqueous peel extract was described in this *** green fabricated TiO_(2) nanoparticles were characterized by UV-vis spectrum,XRD,FT-IR,and FE-SEm with *** TiO_(2) nanoparticles exhibited excellent antimicrobial and photodegradation *** it has demonstrated the release of reactive oxygen species(ROS)and proven mitochondrial membrane potential in a dosage manner of 0-100μg/*** statistics were also examined with P valuesmultidisciplinary applications.

关键词： Biomaterials Nanoparticles L.acidissima Anticancer Antimicrobial and photodegradation activities

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Beneficiation of a low grade limestone sample

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mining Science and Technology 2011年第5期21卷 631-636页

作者： Rao Danda Srinivas vijayakumar Tadiparthi Venkata Subba Rao Sripada Bhaskar Raju Guntamadugu Prabhakar Swarna National metallurgical Laboratory madras Centre CSIR Madras Complex Chennai 600 113 India

Pilot scale column flotation studies were conducted on a low grade siliceous limestone ore. Silica content was reduced to less than 13g in the concentrate so that it became satisfactory for use in the paper or rubber industries. The limestone sample was crystalline and constituted primarily of calcite that contained quartz, feldspar, pyroxene, and biotite as gangue minerals. Quartz is the major silicate gangue whereas feldspar, pyroxene, and biotite exist in minor to trace quantities. Traces of pyrite were also observed within the sample. A reverse flotation process was adopted where the silicate gangue minerals were floated using two different commercial cationic collectors： Chem-750 F or Floatamine-D. The studies clearly suggest it is possible to produce a limestone concentrate assaying around 96-97% CaCO3 containing less than 1 % Si02. The effect of feed flow rate, percent solids, froth depth, and wash water on the grade and recovery of the CaC03 concentrate is discussed.

关键词： Low grade limestoneReverse flotationColumn flotationCationic collector

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Systematic development of ionizable lipid nanoparticles for placental mRNA delivery using a design of experiments approach

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Bioactive materials 2024年第4期34卷 125-137页

作者： Rachel E.Young Katherine m.Nelson Samuel I.Hofbauer Tara vijayakumar mohamad-Gabriel Alameh Drew Weissman Charalampos Papachristou Jason P.Gleghorn Rachel S.Riley Department of Biomedical Engineering Henry M.Rowan College of EngineeringRowan University201 Mullica Hill RdGlassboroNJ 08028United States School of Translational Biomedical Engineering&Sciences Virtua College of Medicine&Life Sciences of Rowan University201 Mullica Hill RdGlassboroNJ 08028United States Department of Chemical and Biomolecular Engineering College of EngineeringUniversity of Delaware150 Academy StreetNewarkDE 19716United States Cooper medical School of Rowan University Rowan University401 BroadwayCamdenNJ 08103United States Perelman School of medicine University of Pennsylvania3400 Civic Center BlvdPhiladelphiaPA 19104United States Department of mathematics College of Science&MathematicsRowan University201 Mullica Hill RdGlassboroNJ 08028United States Department of Biomedical Engineering College of EngineeringUniversity of Delaware590 Avenue 1743NewarkDE 19713United States

Ionizable lipid nanoparticles(LNPs)have gained attention as mRNA delivery platforms for vaccination against COVID-19 and for protein replacement *** enhance mRNA stability,circulation time,cellular uptake,and preferential delivery to specific tissues compared to mRNA with no carrier ***,LNPs are only in the beginning stages of development for safe and effective mRNA delivery to the placenta to treat placental ***,we develop LNPs that enable high levels of mRNA delivery to trophoblasts in vitro and to the placenta in vivo with no *** conducted a Design of Experiments to explore how LNP composition,including the type and molar ratio of each lipid component,drives trophoblast and placental *** data revealed that utilizing C12-200 as the ionizable lipid and 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine(DOPE)as the phospholipid in the LNP design yields high transfection efficiency in *** of lipid molar composition as a design parameter in LNPs displayed a strong correlation between apparent pKa and poly(ethylene)glycol(PEG)content,as a reduction in PEG molar amount increases apparent ***,we present one LNP platform that exhibits the highest delivery of placental growth factor mRNA to the placenta in pregnant mice,resulting in synthesis and secretion of a potentially therapeutic ***,our high-performing LNPs have no toxicity to both the pregnant mice and *** results demonstrate the feasibility of LNPs as a platform for mRNA delivery to the placenta,and our top LNP formulations may provide a therapeutic platform to treat diseases that originate from placental dysfunction during pregnancy.

关键词： Lipid nanoparticles(LNPs) Drug delivery Nucleic acids Placental growth factor(PlGF) Placenta Pregnancy Preeclampsia

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A two-scale approach for estimating forest aboveground biomass with optical remote sensing images in a subtropical forest of Nepal

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Journal of Forestry Research 2019年第6期30卷 2119-2136页

作者： Upama A.Koju Jiahua Zhang Shashish maharjan Sha Zhang Yun Bai Dinesh B.I.P.vijayakumar Fengmei Yao Key Laboratory of Digital Earth Sciences Institute of Remote Sensing and Digital EarthCASBeijing 100094People’s Republic of China University of Chinese Academy of Sciences Beijing 100094People’s Republic of China International maize and Wheat Improvement Center Kathmandu 44600Nepal The Laboratory of Forest Inventory The National Institute of Geographic and Forest InformationNancyFrance

Forests account for 80%of the total carbon exchange between the atmosphere and terrestrial ***,to better manage our responses to global warming,it is important to monitor and assess forest aboveground carbon and forest aboveground biomass(FAGB).Different levels of detail are needed to estimate FAGB at local,regional and national ***-scale remote sensing analysis from high,medium and coarse spatial resolution data,along with field sampling,is one approach often ***,the methods developed are still time consuming,expensive,and inconvenient for systematic monitoring,especially for developing countries,as they require vast numbers of field samples for ***,we recommend a convenient two-scale approach to estimate FAGB that was tested in our study *** study was conducted in the Chitwan district of Nepal using GeoEye-1(0.5 m),Landsat(30 m)and Google Earth very high resolution(GEVHR)Quickbird(0.65 m)*** the local scale(Kayerkhola watershed),tree crowns of the area were delineated by the object-based image analysis technique on GeoEye *** overall accuracy of 83%was obtained in the delineation of tree canopy cover(TCC)per plot.A TCC *** model was developed based on the TCC estimations from GeoEye and FAGB measurements from field sample plots.A coefficient of determination(R2)of 0.76 was obtained in the modelling,and a value of 0.83 was obtained in the validation of the *** upscale FAGB to the entire district,open source GEVHR images were used as virtual field *** delineated their TCC values and then calculated FAGB based on a TCC versus FAGB *** the multivariate adaptive regression splines machine learning algorithm,we developed a model from the relationship between the FAGB of GEVHR virtual plots with predictor parameters from Landsat 8 bands and vegetation *** model was then used to extrapolate FAGB to the entire *** approach considerably reduced the need for field data and com

关键词： Forest aboveground biomass Google Earth imagery multi-scale remote sensing Virtual plot Optical imagery

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mechanistic insights on immunosenescence and chronic immune activation in HIV-tuberculosis co-infection

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World Journal of Virology 2015年第1期4卷 17-24页

作者： Esaki m Shankar vijayakumar Velu Adeeba Kamarulzaman marie Larsson Tropical Infectious Disease Research and Education Center Department of Medical MicrobiologyFaculty of MedicineUniversity of Malaya Department of microbiology and Immunology Emory Vaccine CenterYerkes National Primate Research Center Center of Excellence for Research in AIDS University of Malaya Division of molecular Virology Department of Clinical and Experimental MedicineLink?ping University

Immunosenescence is marked by accelerated degradation of host immune responses leading to the onset of opportunistic infections, where senescent T cells show remarkably higher ontogenic defects as compared to healthy T cells. The mechanistic association between T-cell immunosenescence and human immunodeficiency virus(HIV) disease progression, and functional T-cell responses in HIV-tuberculosis(HIV-TB) co-infection remains to be elaborately discussed. Here, we discussed the association of immunosenescence and chronic immune activation in HIV-TB co-infection and reviewed the role played by mediators of immune deterioration in HIV-TB coinfection necessitating the importance of designing therapeutic strategies against HIV disease progression and pathogenesis.

关键词： Cluster of differentiation 38 Human immunodeficiency virus-tuberculosis co-infection Immunosenescence

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Cyanobacterial metabolites as novel drug candidates in corona viral therapies:A review

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Chronic Diseases and Translational medicine 2022年第3期8卷 172-183页

作者： Srinivasan Prabhu Subramaniyan vijayakumar Pabakaran Praseetha Department of Botany Annai Vailankanni Arts and Science CollegeThanjavurTamil NaduIndia Deparment of Botany A.V.V.M Sri Pushpam CollegePoondi(Affiliated to Bharathidasan University)ThanjavurTamil NaduIndi Department of Nnotechnology Noorul Islam Cenire for Higher EducationKumaracolTamil NaduIndia

most of the medical and nonmedical research labs,all around the world,are racing against time to produce an effective vaccine or an antiviral medicine for coronavirus disease 2019(COVID-19).Conventional medicines and novel nano-materials including chemical and herbal-based compounds are all into positive trials toward coronaviruses and other pandemic *** them,natural immune boosters have attracted physicians because of their longevity and reliability for fewer side *** is a review article with a detailed picture of an unexplored antiviral source with maximum potency in curing viral *** have been known for centuries and are rich in secondary metabolites of proteins,biopeptides,and polysaccharides for prominent antiviral action against chest *** detailed exploratory research is required to purify,scale-up,and commercialize the pharmacologically active agents from these drug reserves.

关键词： antiviral drugs coronavirus covid-19 cyanobacteria

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