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Spectroscopic investigations on the effect of humic acid on the formation and solubility of secondary solid phases of Ln_2(CO_3)_3

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Journal of Rare Earths 2011年第6期29卷 516-521页

作者： Stella Antoniou Ioannis Pashalidis Andre Gessner Michael u Kumke Department of Chemistry University of Cyprus P.O. Box 20537 1678 Nicosia Cyprus Chemistry Department/Physical Chemistry University of Potsdam Karl- Liebknecht-Str. 24-25 14476 Potsdam-Golm Germany

The formation of secondary Ln（III） solid phases （e.g., Nd2（CO3）3 and Sm2（CO3）3） was studied as a function of the humic acid concentration in 0.1 mol/L NaClO4 aqueous solution in the neutral pH range （5–6.5）. The solid phases under investigation were prepared by alkaline precipitation under 100% CO2 atmosphere and characterized by attenuated total reflectance Fourier transform infrared spectroscopy （ATR-FTIR）, X-ray diffraction （XRD）, time-resolved laser fluorescence spectroscopy （TRLFS）, diffuse reflectance ultraviolet-visible （DR-uV-Vis）, Raman spectroscopy, and solubility measurements. The spectroscopic data obtained indicated that Nd2（CO3）3 and Sm2（CO3）3 were stable and remained the solubility limiting solid phases even in the presence of increased humic acid concentration （0.5 g/L） in solution. upon base addition in the Ln（III）-HA system, decomplexation of the previously formed Ln（III）-humate complexes and precipitation of two distinct phases occurred, the inorganic （Ln2（CO3）3） and the organic phase （HA）, which was adsorbed on the particle surface of the former. Nevertheless, humic acid affected the particle size of the solid phases. Increasing humic acid concentration resulted in decreasing crystallite size of the Nd2（CO3）3 and increasing crystallite size of the Sm2（CO3）3 solid phase, and affected inversely the solubility of the solid phases. However, this impact on the solid phase properties was expected to be of minor relevance regarding the chemical behavior and migration of trivalent lanthanides and actinides in the geosphere.

关键词： lanthanide ions humic acid solid phase solubility Raman TRLFS DR-uV-Vis rare earths

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Control of a unified Chaotic System via Single Variable Feedback

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Chinese Physics Letters 2009年第9期26卷 65-68页

作者：郭荣伟 u. E. Vincent Department of Mathematical and Physical Sciences Shandong Institute of Light Industry Jinan 250353 Institute of Theoretical Physics Technical University of Clausthal Arnold-Sommer Str. 6 38678 Clausthal-Zellerfeld Germany Department of Physics Olabisi Onabanjo University Ago-Iwoye Nigeria

Based on the LaSalle invariance principle, we propose a simple adaptive-feedback for controlling the unified chaotic system. We show explicitly with numerical proofs that our method can easily achieve the control of chaos in the unified chaotic system using only a single variable feedback. The present controller, to our knowledge, is the simplest control scheme for controlling a unified chaotic system.

关键词： sea surface nonliear interaction numerical method

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Tumor organoids to study gastroesophageal cancer: a primer

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Journal of Molecular Cell Biology 2020年第8期12卷 593-606页

作者： Ramon u.Jin Jason C.Mills Division of Oncology Department of Internal MedicineWashington University School of MedicineSt.LouisMO 63130USA Division of Gastroenterology Department of Internal MedicineWashington University School of MedicineSt.LouisMO 63130USA Department of Developmental Biology Washington University School of MedicineSt.LouisMO 63130USA Department of Pathology and Immunology Washington University School of MedicineSt.LouisMO 63130USA

Gastroesophageal cancers are leading causes of cancer *** attempts at adopting molecularly based treatment approaches have been slow and ineffective even though we begin to identify specific targetable gene mutations and *** is dear that we should no longer treat all gastroesophageal cancers as a homogeneous disease,which is what we do when we use nonspecific ***,we currently cannot monitor successful gene/pathway targeting,nor understand how/when tumors develop resistance,nor predict which patients will derive maximal *** improve outcomes,we must precisely detail the heterogeneity of these tumors to then individualize cancer therapy as well as develop novel avenues to study and predict treatment effects in individual *** this end,patient-derived organoids,in which tumor cells from individual patients are grown in a Petri dish,are a new versatile system that allows for timely expandability,detailed molecular characterization,and genetic manipulation with the promise of enabling predictive assessment of treatment *** this review,we will explore the development and basic techniques for organoid generation,and discuss the current and potential future applications of this exciting technology to study the basic science of carcinogenesis and to predict/guide cancer patient care in the clinics.

关键词： targeted therapy precision oncology cancer model tumor heterogeneity cancer evolution personalized medicine

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RATIONAL GENERAL SOLuTIONS OF HIGHER ORDER ALGEBRAIC ODES

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Journal of Systems Science & Complexity 2013年第2期26卷 261-280页

作者： HuANG Yanli NG L X Chu WINKLER Franz School of Computer Science and Software Engineering Tianjin Polytechnic University Research Institute for Symbolic Computation(RISC) Johannes Kepler University Department of Mathematics Quy Nhon University

This paper generalizes the method of Ng6 and Winkler （2010, 2011） for finding rational general solutions of a first order non-autonomous algebraic ordinary differential equation （AODE） to the case of a higher order AODE, provided a proper parametrization of its solution hypersurface. The authors reduce the problem of finding the rational general solution of a higher order AODE to finding the rational general solution of an associated system. The rational general solutions of the original AODE and its associated system are in computable 1-1 correspondence. The authors give necessary and sufficient conditions for the associated system to have a rational solution based on proper reparametrization of invariant algebraic space curves. The authors also relate invariant space curves to first integrals and characterize rationally solvable systems by rational first integrals.

关键词： Algebraic ODE associated system invariant algebraic space curve rational first integral rational general solution.

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Silicon nanowire formed via shallow anisotropic etching Si-ash-trimming for specific DNA and electrochemical detection

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Chinese Physics B 2015年第6期24卷 607-612页

作者： Tijjani Adam u.HAshim Th S.Dhahi Institute of Nano Electronic Engineering(INEE) Universiti Malaysia Perlis(UniMAP) Physics Department College of Education for Pure ScienceBasra University

A functionalized silicon nanowire field-effect transistor （SiNW FET） was fabricated to detect single molecules in the pM range to detect disease at the early stage with a sensitive, robust, and inexpensive method with the ability to provide specific and reliable data. The device was designed and fabricated by indented ash trimming via shallow anisotropic etching. The approach is a simple and low-cost technique that is compatible with the current commercial semiconductor standard CMOS process without an expensive deep reactive ion etcher. Specific electric changes were observed for DNA sensing when the nanowire surface was modified with a complementary captured DNA probe and target DNA through an organic linker （--OCH2CH3） using organofunctional alkoxysilanes （3-aminopropyl） triethoxysilane （APTES）. With this surface modification, a single specific target molecule can be detected. The simplicity of the sensing domain makes it feasible to miniaturize it for the development of a cancer detection kit, facilitating its use in both clinical and non-clinical environments to allow non-expert interpretation. With its novel electric response and potential for mass commercial fabrication, this biosensor can be developed to become a portable/point of care biosensor for both field and diagnostic applications.

关键词： silicon nanowire biosensor specific DNA detection anisotropic etching Si-ash-trimming semi-conductor pH sensor

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Microstructural Development of Ti-B Alloyed Layer for Hard Tissue Applications

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Journal of Materials Science & Technology 2013年第6期29卷 565-572页

作者： A.Miklaszewski M.u.Jurczyk M.Jurczyk Institute of Materials Science and Engineering Poznan University of TechnologyM.Sklodowska-Curie 5 Sq.60-965 PoznanPoland Mother's and Child's Health Division Poznan University of Medical SciencesPolna 3360-535 PoznanPoland

Microstructural development was analyzed due to the effect of different sizes of precursor powders during surface plasma alloying modification on titanium surface. Ti-B nano and micropowders with 10 wt% B were deposited onto microcrystalline titanium substrate by plasma alloying. As a result, modified surface layer composed of Ti matrix and TiB borides was obtained. The type of the powder precursor influenced recasting process, possible occurrence of porosity and finally the obtained properties and microstructure of the surface layer. Different morphologies and sizes of TiB phase from micro, submicro to even nano increased the hardness and wear resistance of the obtained surface layers. Discussed results referred to a strong TiB precipitation dispersion provided by a fine elements homogenization during mechanical alloying process. Additionally, results of in vitro test with normal human osteoblast cells revealed proper cellular adhesion to modified surfaces. Scanning electron microscopy observation revealed the influence of gas pore size on culturing osteoblast colony. The proposed surface alloying was an effective method of producing TiB phase dispersed in α-Ti matrix with high hardness, good corrosion resistance and good cytocompatibility. Results confirmed that different types of the precursor powders influenced the properties of the surface layer. TiB phase dispersed in α-Ti matrix layer can offer new structural and biofunctional properties for innovative products in hard tissue applications.

关键词： Titanium TiB phase Nano and micro precursors Microstructure Corrosion resistance Cytocompatibility

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An overview of inflammation: mechanism and consequences

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Frontiers in Biology 2011年第4期6卷 274-281页

作者： Afsar u.AHMED Monash university Department of Medicine Centre for Inflammatory DiseasesMonash Medical Centre246Clayton RoadClaytonVIC 3168 Australia

Inflammation is an essential response provided by the immune systems that ensures the survival duringinfection and tissue injury. Inflammatory responses are essential for the maintenance of normal tissue homeostasis. Themolecular mechanism of inflammation is quite a complicated process which is initiated by the recognition of specificmolecular patterns associated with either infection or tissue injury. The entire process of the inflammatory response ismediated by several key regulators involved in the selective expression of proinflammatory molecules. Prolongedinflammations are often associated with severe detrimental side effects on health. Alterations in inflammatory responsesdue to persistent inducers or genetic variations are on the rise over the last couple of decades, causing a variety ofinflammatory diseases and pathophysiological conditions.

关键词： Inflammation inflammatory diseases proinflammatory cytokines pattern-recognition receptors transcription factors and chromatin structure

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The mechanism of protein kinase C regulation

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Frontiers in Biology 2011年第4期6卷 328-336页

作者： Julhash u.KAZI Laboratory of Computational Biochemistry KN Biomedical Research InstituteBagura RoadBarisalBangladesh Quality Control Section Opsonin Pharma LtdBagura RoadBarisalBangladesh

Protein kinase C (PKC) is a family of serine/threonine protein kinases that plays a central role in transducingextracellular signals into a variety of intracellular responses ranging from cell proliferation to apoptosis. Nine PKCgenes have been identified in the human genome, which encode 10 proteins. Each member of this protein kinase familydisplays distinct biochemical characteristics and is enriched in different cellular and subcellular locations. Activation ofPKC has been implicated in the regulation of cell growth and differentiation. This review summarizes works of the pastyears in the field of PKC biochemistry that covers regulation and activation mechanism of different PKC isoforms.

关键词： PKC biochemistry PKC kinase PKC phosphatases PKC structure

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Instability of binary nanofluids with magnetic field

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Applied Mathematics and Mechanics(English Edition) 2015年第6期36卷 693-706页

作者： u.GuPTA J.SHARMA V.SHARMA Dr.S.S.Bhatnagar university Institute of Chemical Engineering and Technology Panjab University Energy Research Centre Panjab University Department of Mathematics Himachal Pradesh University

The present paper investigates the effects of a vertical magnetic field on the double diffusive nanofluid convection, The effects of the Brownian motion and ther- mophoresis due to the presence of nanoparticles and the effects of the Dufour and Sorer parameters due to the presence of solute are included in the investigated model. The normal mode technique is used to solve the conservation equations. For the analytical study, valid approximations are made in the complex expression for the Rayleigh number to get useful and interesting results. The bottom heavy binary nanofluids are more stable than the regular binary fluids, while the top heavy binary nanofluids are less stable than the regular binary fluids. The critical wave number and the critical Rayleigh number in- crease whereas the frequency of oscillation （for the bottom heavy configuration） decreases when the Chandrasekhar number increases. The numerical results for the alumina-water nanofiuid are studied by use of the MATHEMATICA software.

关键词： natural convection binary nanofluid Brownian motion thermophoresis,Chandrasekhar number

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Thermal Properties of Ni–Cr–Si–B–Fe Based Interlayer Material and Its Application in TLP Bonding of IN 718 Superalloy

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Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1666-1680页

作者： u.K.Tarai P.S.Robi Sukhomay Pal Department of Mechanical Engineering IIT GuwahatiGuwahati 781039India

A new Ni–Cr–Si–B–Fe fi ller material is prepared for transient liquid-phase(TLP)bonding of Inconel 718 superalloy by mechanical alloying *** melting temperature range of the fi ller material and its activation energy of melting are determined by diff erential scanning calorimetry *** activation energy and melting temperature of the alloy powder decrease with increasing milling *** 718 alloy was joined via TLP by using the newly developed fi ller *** eff ect of TLP bonding temperature and time on microstructural evolution and mechanical properties of the joint was *** distinct microstructural regions were observed in the bonding area:isothermal solidifi cation zone consisting of a single-phase solid solution,diff usion aff ected zone consisting of extensive diff usion-induced precipitates of metallic boride,and unaff ected base *** ultimate shear strength and microhardness of the TLP-bonded joint increase with bonding time and temperature.

关键词： Transient liquid-phase(TLP)bonding Kissinger plot Mechanical alloying Inconel 718

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