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Browsing by Subject "complex formation"

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    • Article  

      Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions 

      Hadjittofi, Loukia; Prodromou, Melpomeni; Pashalidis, Ioannis (2014)
      The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial ...

    • Article  

      Adsorption of hexavalent uranium on biomass by-product 

      Konstantinou, M.; Pashalidis, Ioannis (2007)
      The effectiveness of the uranium removal by olive cake from aqueous solutions has been demonstrated in batch type experiments under normal atmospheric conditions. The adsorption capacity has been evaluated by using both ...

    • Article  

      Adsorption of trivalent lanthanides by marine sediments 

      Liatsou, Ioanna; Efstathiou, Maria; Pashalidis, Ioannis (2015)
      The interaction of Eu(III) with two different types of marine sediments has been investigated as a function of various parameters (e.g. pH, [Eu(III)]o, I, humic acid) to evaluate their effect on the Eu(III) adsorption. The ...

    • Article  

      Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes 

      Savva, Ioanna; Efstathiou, Maria; Krasia‐Christoforou, Theodora; Pashalidis, Ioannis (2013)
      Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...

    • Article  

      Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes 

      Savva, I.; Efstathiou, M.; Krasia-Christoforou, T.; Pashalidis, I. (2013)
      Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...

    • Article  

      Application of different types of resins in the radiometric determination of uranium in waters 

      Kyriakou, M.; Pashalidis, Ioannis (2011)
      The aim of this study is to compare different resins regarding their separation and pre-concentration efficiency for uranium from aqueous solutions and its subsequent radiometric determination by liquid scintillation ...

    • Article  

      Attenuation of drug-stimulated topoisomerase II-DNA cleavable complex formation in wild-type HL-60 cells treated with an intracellular calcium buffer is correlated with decreased cytotoxicity and site-specific hypophosphorylation of topoisomerase IIα 

      Aoyama, M.; Grabowski, D. R.; Dubyak, G. R.; Constantinou, Andreas I.; Rybicki, L. A.; Bukowski, R. M.; Ganapathi, M. K.; Hickson, I. D.; Ganapathi, R. (1998)
      Topoisomerase II (topo II), an essential enzyme for cell viability, is also the target for clinically important anti-neoplastic agents that stimulate topo II-mediated DNA scission. The role of alterations in topo IIα ...

    • Article  

      Competition studies of L1-deferiprone with copper and iron. Possible implications on efficacy, toxicity and new therapeutic applications 

      Pashalidis, Ioannis; Kontoghiorghes, G. J. (2000)

    • Article  

      Competitive sorption of Cu(II), Eu(III) and U(VI) ions on TiO2 in aqueous solutions-A potentiometric study 

      Konstantinou, M.; Pashalidis, Ioannis (2008)
      The competitive sorption of Cu(II), Eu(III) and U(VI) ions in aqueous solutions by TiO2, has been investigated by potentiometry at I = 0.1 M NaClO4, 25 °C and under atmospheric conditions. For Cu(II) ions the investigation ...

    • Article  

      Controlled production of ZnO nanoparticles from zinc glycerolate in a sol-gel silica matrix 

      Moleski, R.; Leontidis, Epameinondas; Krumeich, F. (2006)
      The controlled production of ZnO nanoparticles within an amorphous silica matrix is achieved using a new methodology consisting of four stages. First, precursor zinc glycerolate nanoparticles are produced within reversed ...

    • Article  

      Decay of the transient CuB-CO complex is accompanied by formation of the heme Fe-CO complex of cytochrome cbb3-CO at ambient temperature: Evidence from time-resolved fourier transform infrared spectroscopy 

      Stavrakis, Stavros; Koutsoupakis, Constantinos; Pinakoulaki, Eftychia; Urban, A.; Saraste, M.; Varotsis, Constantinos (2002)
      Time-resolved step-scan Fourier infrared spectroscopy has been used to study the CO-bound cbb3-type cytochrome c oxidase from Pseudomonas stutzeri at room temperature. We observe a single band in the FTIR spectrum at 1956 ...

    • Article  

      The effect of aging and natural organic matter on the Th(OH)4 solubility 

      Prodromou, Melpomeni; Antoniou, Stella; Pashalidis, Ioannis (2014)
      The solution chemistry of actinides, particularly hydrolysis, is of major importance in the design of nuclear waste repositories and in relation to nuclear fuel reprocessing cycles. In this study the formation and solubility ...

    • Article  

      Effective complex formation in the interaction of 1,2-dimethyl-3-hydroxypyrid-4-one (Deferiprone or L1) with uranium(VI) 

      Pashalidis, Ioannis; Kontoghiorghes, G. J. (1999)
      In an effort to develop new chelating agents for the decorporation of uranium and other actinides, the interaction of the clinically used 1,2-dimethyl-3-hydroxypyrid-4-one (Deferiprone or LI) with hexavalent uranium was ...

    • Article  

      Fourier transform infrared (FTIR) and step-scan time-resolved FTIR spectroscopies reveal a unique active site in cytochrome caa3 oxidase from Thermus thermophilus 

      Pinakoulaki, Eftychia; Soulimane, T.; Varotsis, Constantinos (2002)
      Fourier transform infrared (FTIR) and step-scan time-resolved FTIR difference spectra are reported for the [carbonmonoxy]cytochrome caa3 from Thermus thermophilus. A major C-O mode of heme a3 at 1958 cm-1 and two minor ...

    • Article  

      Glycogen phosphorylase inhibitors: A free energy perturbation analysis of glucopyranose spirohydantoin analogues 

      Archontis, Georgios Z.; Watson, K. A.; Xie, Q.; Andreou, Georgia; Chrysina, Evangelia D.; Zographos, Spyros E.; Oikonomakos, Nikos G.; Karplus, M. (2005)
      GP catalyzes the phosphorylation of glycogen to Glc-1-P. Because of its fundamental role in the metabolism of glycogen, GP has been the target for a systematic structure-assisted design of inhibitory compounds, which could ...

    • Article  

      Hofmeister anion effects on surfactant self-assembly and the formation of mesoporous solids 

      Leontidis, Epameinondas (2002)
      Recent work on mesoporous silica formation using cationic and non-ionic templates has unveiled a large number of anion effects. Anions are seen to change the hydrolysis rates of the silicate precursors, affecting the surface ...

    • Article  

      Impurity-induced antiferromagnetic order in the Haldane-gap compound PbNi2-xMgxV2O8 (x=0.24) 

      Lappas, A.; Alexandrakis, V.; Giapintzakis, John; Pomjakushin, V.; Prassides, K.; Schenck, A. (2002)
      An investigation of the effect of nonmagnetic Mg doping in the Haldane gap system PbNi2V2O8 is presented. Specifically, the magnetic properties of the quasi-one-dimensional compound PbNi2-xMgxV2O8 (x =0.24), located in the ...

    • Article  

      Inhibition of mitogen-activated protein kinase (MAPK) and cyclin-dependent kinase 2 (Cdk2) by platinum(II) phenanthroline complexes 

      Child, E. S.; Georgiades, Savvas N.; Rose, K. N.; Stafford, V. S.; Patel, C. B. K.; Steinke, J. H. G.; Mann, D. J.; Vilar, R. (2011)
      Inhibition of protein kinases in the fight against disease remains a constant challenge for medicinal chemists, who have screened multitudes of predominantly planar organic scaffolds, natural and synthetic, to identify ...

    • Article  

      Insulin-mimetic action of vanadium compounds on osteoblast-like cells in culture 

      Etcheverry, S. B.; Crans, D. C.; Keramidas, Anastasios D.; Cortizo, A. M. (1997)
      Vanadium compounds mimic insulin actions in different cell types. The present study concerns the insulin-like effects of three vanadium(V) derivatives and one vanadium(IV) complex on osteoblast-like (UMR106 and MC3T3E1) ...

    • Article  

      Interaction between 1,2-dimethyl-3-hydroxypyrid-4-one and europium(III) 

      Hadjiloizou, P.; Pashalidis, Ioannis (2007)
      The interaction of the clinically used 1,2-dimethyl-3-hydroxypyrid-4-one with trivalent europium Eu(III), was investigated by using potentiometric and spectroscopic methods. The stability constants of the EuLn (3-n)+ ...

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