SummaryA novel, strictly anaerobic, hyperthermophilic, facultative organotrophic archaeon was isolated from a hot spring at Pisciarelli Solfatara, Naples, Italy. The rod-shaped cells grew chemolithoautotrophically with carbon dioxide as carbon source, hydrogen as electron donor and arsenate, thi...

Synthesis of nanoparticles is an enzymatic reduction process in microorganisms. In the present study, a protein, lignin peroxidase has been purified by DEAE-Cellulose anion exchange chromatography and Biogel P-150 gel filtration chromatography from the cell suspension of Acinetobacter sp. SW30 r...

The synthesis of HAu(SeO4)2 and MAu(SeO4)2, where M is K, Rb or Cs, is described. The synthesis of Au2O3 · 5.2H2O, as a starting substance for double selenates, is presented also. The synthesized compounds were investigated by chemical and thermal analysis. The chemical compositions of the samp...

Cell-free extracts of Alcaligenes sp. CKCr-6A that was isolated from Sabzevar of Iran catalyzes the NADH-dependent reduction of selenate and selenite to elemental selenium. Selenate reductase enzyme was purified with following purification process involved (NH4)2SO4 precipitation, followed by us...

Cellulose-agar (CAB) composite hydrogel beads were generated for the uptake-release kinetics studies of Se(VI) and selenomethionine (SeMt) from water medium. The objective of this work is to analyze the surface structure, gel properties, thermal stability and chemical functionalities responsible...

In this study, we proposed a novel anti-aggregation of gold nanoparticles (AuNPs) strategy for colorimetric sensing of iodide ions (I−) regulated by the redox reaction between the target ions and the ion cross-linking agent. Cu2+ as interlinking ion can induce aggregation of arginine capped AuNP...

A copper(I) iodide based MOFs crystal with the formula [Cu4I4(Pz)2]n (Pz = [1,4-bis(4-pyridylmethyl)piperazine]) (1) was synthesized using a solvothermal method. The compound 1 crystallized in the monoclinic space group C2/c at room temperature and consisted of Cu4I4 clusters. Along the b-axis, ...

The thermodynamic equilibria and kinetic aspect of gold dissolution in iodine–iodide leaching were studied with emphasis on the effects of pH value and temperature on the system. The results of thermodynamic analysis of iodine in aqueous solution were given and numerous forms of iodine exist ma...

This work reports on the applicability of unmodified citrate-protected gold nanoparticles (AuNPs) obtained by the Turkevich-Frens method as nanoprobes for iodide detection. The colorimetric assay is based on the red-shift of the gold localized surface plasmon resonance (LSPR), which is produced ...

Nanotheranostics has gained increasing interest, as it offers a great potential to realize personalized diagnostics and therapy. In this work, we report a facile approach of the fabrication of gold nanostars (GNS) attached with matrix metalloproteinases (MMP2) polypeptides (Ac-GPLGIAGQ) and IR-7...

This work presents a Lovibond comparator device based on gold nanoparticles (AuNPs) for colorimetric screening of poly-diallyldimethylammonium chloride (poly-DADMAC) in raw and treated potable water. The colorimetric disk printed on the plastic slide was fabricated with 14 nm AuNPs and then inse...

A separation process was developed to recover Au(III) from the chloride leach solution of anode slime using selective extraction and stripping step. The anode slime contained Ag, Au, Cu, Ni, Sn and Zn. The extraction with Cyanex 272 in kerosene was conducted by varying the HCl concentration of t...

Gold is widely used as the electrode material in different chemi- and biosensing applications while cyclic voltammetry (CV) in sulfuric acid solutions is a commonly employed method for gold surface preparation and characterization. However, as shown herein, chloride leakage from the Ag/AgCl/sat....

Copper(I) and gold(I) thiolates were synthesized in quantitative or near-quantitative yield by the direct reaction of aqueous Cu(NO3)2 or HAuCl4 with aqueous thiols HSCH2CH2OH and HSCH2CH2OCH2CH2OH. The resulting highly insoluble thiolates had spectroscopic and bulk characteristics consistent wi...

Separation of macro amount of gold(III) from a small amount of Pd(II) was investigated by ion exchange. From the screening experiments, a nonionic resin Amberlite XAD7HP was selected for this purpose. The adsorption behavior of Au(III) onto Amberlite XAD7HP followed Langmuir isotherm. The loadin...

The preparation of a series of gold(I) compounds of general formulae (LH2)(AuBr2) and (LH2)2- (AuBr2)Br (LH2+: 5-arylazoniumuracil cations) is described. The crystal structure of (DZH2)2(AuBr2)- Br·H2O (DZH2+ 6-amino-1,3-dimethyl-5-phenylazoniumuracil cation) was determined. The crystals are tr...

A general method has been developed for accumulation of a dinuclear ruthenium complex [Ru2(dhpta)(μ-O2CCH3)2]− (H5dhpta = 1,3-diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid) on a gold surface. The accumulation using a ligand substitution reaction of bridging acetate in the complex by ter...

A new way for gold nanoparticle dimer formation based on the coordination interaction of a benzimidazole copper(ii) complex with gold nanoparticles has been proposed.

Single crystals of two modifications of AuBr, called P-AuBr and I-AuBr, were prepared by a vapour-transport method. I-AuBr is isostructural with AuCl; it is tetragonal with a = 6.940Å, c = 9.252Å, space group I41/amd, Z = 8. P-AuBr is isostructural with Aul; it is tetragonal with a = 4.296Å, ...

Four modifications of AuBr exist. The low temperature form α-AuBr transforms at 85–100 °C to P-AuBr. P-AuBr is stable up to 197 °C and I-AuBr between 197 °C and 298 °C; above 298 °C until 330 °C a b.c.c. phase is observed. The transition I-AuBr → P-AuBr below 197 °C is sluggish; the tr...