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Showing 1-30 of 38 results for "259225" within Papers
W Hillier et al.
Biochemistry, 36(1), 76-85 (1997-01-07)
The behavior of photosystem II (PSII) reactions was investigated under conditions of decreasing water content by the addition of increasing concentrations of ethylene glycol (EG). The photosynthetic activities were measured for PSII samples either directly in aqueous solutions of EG
Yinhua Jiang et al.
Journal of colloid and interface science, 455, 125-133 (2015-06-10)
A novel ionic liquid modified copolymer hydrogel (PAMDA) was successfully synthesized by a simple water solution copolymerization using acrylamide (AM), dimethyldiallylammonium chloride (DADMAC) and ionic liquid (1-allyl-3-methylimidazolium chloride; [Amim]Cl) as copolymerization monomers. The structure and morphology of as-prepared copolymer hydrogel
Hg (II) voltammetry on a 1, 5-diphenylcarbazide containing carbon paste electrode.
Navratilova Z.
Electroanalysis, 3(8), 799-802 (1991)
Dorota Swiecicka et al.
Roczniki Panstwowego Zakladu Higieny, 59(4), 397-405 (2009-02-21)
The aim of this work was optimization and validation of the method of determination of Cr(VI) existing in the form of chromate(VI) in mineral and spring waters by High Performance Ion Chromatography (HPIC) technique with application of postcolumn reaction with
F El-Kabbany et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 78(3), 981-988 (2011-01-18)
IR analysis is used here to investigate the changes in N-N, N-H, CO modes of thermally treated diphenyl carbazide (DPC) during the variation of temperature from room temperature up to ≈160°C. Polymorphism in DPC compound has been studied here by
Surface-enhanced Raman scattering and DFT investigation of 1, 5-diphenylcarbazide and its metal complexes with Ca (II), Mn (II), Fe (III) and Cu (II).
Szabo L, et al.
Journal of Molecular Structure, 1073, 10-17 (2014)
Xi-Mei Xue et al.
FEMS microbiology letters, 356(1), 105-112 (2014-05-28)
ArsH is widely distributed in bacteria, and its function remains to be characterized. In this study, we investigated the function of ArsH from Synechocystis sp. PCC 6803. The inactivation of arsH by insertion of a kanamycin-resistance gene in Synechocystis sp.
G Samanta et al.
Analytical chemistry, 73(9), 2034-2040 (2001-05-17)
An automated continuous instrument for the collection and measurement of aerosol Cr(VI) is described. The system alternately collects the sample on one of two glass fiber filters. After 15-min sample collection on one filter, the sampling switches over to the
M L Ghirardi et al.
Biochemistry, 37(39), 13567-13574 (1998-09-30)
In this paper, we investigate the effects of histidyl amino acid modification on high-affinity Mn binding to photosystem II (PSII) using methods similar to those used in the preceding paper [Ghirardi et al. (1998) Biochemistry 37, 0000] for carboxyl amino
N Rajesh et al.
Journal of hazardous materials, 150(3), 723-727 (2007-06-30)
A method has been developed for the solid phase extraction of chromium(VI) based on the adsorption of its diphenylcarbazide complex on an Amberlite XAD-4 resin column. The influence of acidity, stability of the column, sample volume, flow rate and interfering
P Salinas-Hernández et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 59(11), 2667-2675 (2003-09-10)
In order to find out about the chemical behaviour of the diphenylcarbazide (DPCI) in water, kinetic and thermodynamic studies were carried out using UV-Vis spectrophotometry within the 0-12 pH range. The kinetic parameters and acidity constant were then determined, and
E Campos et al.
Environmental technology, 28(1), 1-9 (2007-02-08)
This paper presents the results of the investigation on the removal of Cr(VI) and the complex Cr(VI)-diphenylcarbazide from aqueous solutions using an electrochemical reactor, with iron electrodes. A maximum value of 99% Cr(VI) removal from aqueous solutions is observed for
C Mystrioti et al.
The Science of the total environment, 539, 105-113 (2015-09-12)
The effectiveness of five plant extracts and juices, i.e. extracts of Camellia sinensis (green tea, GT), Syzygium aromaticum (clove, CL), Mentha spicata (spearmint, SM), Punica granatum juice (pomegranate, PG) and Red Wine (RW), for the production of nanoiron suspensions and
Mingming Zou et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 101, 82-90 (2012-10-27)
In this work, the TiO2, CeO2/TiO2 and Fe2O3/TiO2 powders were irradiated, respectively, by ultrasound and visible-light, and the generation of reactive oxygen species (ROS) were estimated by the method of Oxidation-Extraction Photometry (OEP). That is, the 1,5-diphenyl carbazide (DPCI) can
Caroline de G Sampaio et al.
International journal of biological macromolecules, 78, 273-279 (2015-04-07)
In this work, chitosan/mangiferin particles (CMP) were prepared by spray-drying technique and characterized by SEM, DLS, FTIR, HPLC-UV and adsorption studies to investigate a possible application as a preventive material in cases of human and animal contamination with Cr(VI). CMP
N Rajesh et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 69(2), 612-618 (2007-07-03)
A novel approach has been developed for the solid phase extraction of chromium(VI) based on the adsorption of its diphenylcarbazide complex on a mixture of acid activated montmorillonite (AAM)-silica gel column. The effect of various parameters such as acidity, stability
Muhammad Saleem et al.
Environmental science and pollution research international, 22(14), 10610-10617 (2015-03-07)
The present study was conducted to assess the impact of gibberellic acid on growth and yield of sunflower in hexavalent chromium [Cr(VI)]-contaminated soil in the presence as well as absence of pressmud. Seeds of sunflower were sown in potted soil
A Padarauskas et al.
Journal of chromatography. A, 808(1-2), 193-199 (1998-07-04)
A method for on-line chromatographic preconcentration and determination of chromium(VI) traces has been developed. Chromate was preconcentrated on a C18 column (50 x 6 mm I.D.) after complexation with diphenylcarbazide (DPC). Following the preconcentration step, analysis of the sample was
M D Mamedov et al.
Biochemistry. Biokhimiia, 75(5), 579-584 (2010-07-17)
Transfer of electrons between artificial electron donors diphenylcarbazide (DPC) and hydroxylamine (NH2OH) and reaction center of manganese-depleted photosystem 2 (PS2) complexes was studied using the direct electrometrical method. For the first time it was shown that reduction of redox-active amino
Sivanildo da Silva Borges et al.
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 18(12), 1361-1366 (2002-12-28)
Oxidation of Cr(III) during sonication in carbonated aqueous solutions saturated with CCl4 leads to the quantitative formation of Cr(VI) and provides a simple and rapid method for spectrophotometric chromium determination with 1,5-diphenylcarbazide. The key to this method is the production
Akbar Bagheri et al.
Talanta, 89, 455-461 (2012-01-31)
A novel sorbent for simultaneous separation of cadmium and copper was prepared by functionalizing SBA-15 nanoporous silica with diphenylcarbazide. A solid-phase extraction method using the above sorbent has been developed to separate and concentrate trace amount of cadmium and copper
M Y Kultisheva et al.
Biochemistry. Biokhimiia, 66(7), 715-720 (2001-09-21)
Extraction of the Mn-cluster from photosystem II (PS II) inhibits the main bands of thermoluminescence and induces a new AT-band at -20 degrees C. This band is attributed to the charge recombination between acceptor QA- and a redox-active histidine residue
B K Semin et al.
FEBS letters, 375(3), 223-226 (1995-11-20)
The interaction of Fe(II) and Fe(III) with the 'high-affinity Mn-binding site' in Mn-depleted photosystem II (PSII) was investigated using diphenilcarbazide (DPC)/2,6-dichlorophenol-indophenol (DCIP) inhibition assay. Fe(III) was ineffective in the inhibition of DPC-DCIP reaction while Fe(II) decreased the rate of DCIP
Kinetic method for the determination of trace amounts of copper (II) in water matrices by its catalytic effect on the oxidation of 1, 5-diphenylcarbazide.
Crespo GA, et al.
Analytica Chimica Acta, 539(1), 317-325 (2005)
K Sivakumar et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 62(4-5), 991-999 (2005-08-16)
The absorption and fluorescence spectra of benzanilide (BA) and diphenyl carbazide (DPC) in solvents of different polarities and pH have been analysed. The spectral characteristics of DPC and BA are compared with diphenyl amine molecule. In water and methanol, a
Deng-ming Sun
Guang pu xue yu guang pu fen xi = Guang pu, 23(1), 196-198 (2003-08-28)
In this paper, the reaction mechanism of the system of thallium (III)-copper(II)-ethylenediaminete-traacetate-hydrogen peroxide-diphenylcarbazide has been studied by spectrophotometric method. The experimental results show that the reaction mechanism of the system is based on the replacement of copper(II) by thallium (III)
Y Nakano et al.
Water research, 35(2), 496-500 (2001-03-07)
We have proposed a new recovery system of hexavalent chromium Cr(VI) that is of great toxicity utilizing condensed-tannin gels derived from a natural polymer with many polyhydroxyphenyl groups. The adsorption mechanism of Cr(VI) to the tannin molecules was clarified. The
Md A Shenashen et al.
Journal of hazardous materials, 244-245, 726-735 (2012-12-01)
The key to designing optical mesocaptors is to construct a chromogenic receptor, namely, diphenylcarbazide (DPC), as a nanoscale platform scavenger with different functional characteristics, such as density, accessibility, and intrinsic mobility. Engineering of optical captors allows facile and reliable signaling
Mohammad Behbahani et al.
Food chemistry, 141(1), 48-53 (2013-06-19)
A novel sorbent for separation of cadmium ions was prepared by functionalizing multiwall carbon nanotubes with diphenylcarbazide and underutilised to develop a solid-phase extraction method to separate and concentrate trace amounts of cadmium ions from some real samples by flame
A W al-Shawi et al.
Journal of chromatography. A, 850(1-2), 137-141 (1999-08-24)
Chromium(VI) is one of seven elements which is classified in the fertilizer industry as being harmful to plants and biological systems. Phosphate rocks represent the raw material for complex fertilizer production in the world. This paper investigates for the first
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