Currently, thirty-eight tantalum, thirty-eight rhenium, thirty-nine osmium, and thirty-eight iridium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification...

The aqueous biphasic system (ABS) involving sodium malonate–polyethylene glycol (PEG) phases has been applied for the first time for separation of no-carrier-added 183Re (T1/2=70 d) from α-particle irradiated bulk tantalum target. The various ABS conditions were applied for investigating the s...

The synthesis of mesostructured cellular foams (MCF) modified by niobium or tantalum source and functionalized with MPTMS (3-mercaptopropyl)trimethoxysilane was monitored in situ by Raman spectroscopy. The results from Raman monitoring prompted us to check for a possibility of shorter time synth...

Using a variable-composition ab initio evolutionary algorithm, the stability of various tantalum carbide compounds at ambient pressure and at 0 K was investigated. The results revealed that TaC, Ta6C5 and Ta2C are the lowest energy configurations, with Ta4C3 and Ta3C2 having slightly higher ener...

Tantalum-doped hydroxyapatite (Ta-doped HA) nanopowders with different Ta contents were synthesized by a wet-chemical precipitation route. The structure modification and charge compensation mechanism were investigated by various characterization techniques. Due to the smaller size of tantalum io...

Dimethyl 2-methyl-1,3-butadienethiophosphonate was copolymerized radically with 1,1,2-trichloro-1,3-butadiene or with ethyl α-cyanoacrylate. IR and NMR spectra (1H and 31P) give evidence that polymerization of the phosphorus-containing monomer and, when it is present in excess, also its copolym...

In the present study, we use a dual approach comprising of experimental and computational techniques to report the syntheses, characterizations (1H NMR, 13C NMR, FT-IR, UV–visible spectroscopy and X-ray structure determination) and theoretically evaluated the third order NLO response properties...

Phenol and catechol were combines with sulfur to develop new melanocytotoxic agents. Among these synthetic compounds, 4-S-cysteaminylphenol (4-S-CAP) and 4-S-cysteinylphenol (4-S-CP), which showed an in vivo antimelanoma effect, were evaluated for cytotoxicity to normal epidermal melanocytes usi...

The incorporation of 4-S-cysteinylphenol (4-S-CP), a tyrosine analog, into malignant melanoma cells was evaluated. 4-S-CP was specifically incorporated into the melanotic melanoma cells (HMV-II), which have activity for melanin synthesis, but was scarcely incorporated into HeLA S3 or HMV-I cells...

Our previous studies showed that 4-S-cysteinylphenol (4-S-CP) and 4-S-cysteaminylphenol (4-S-CAP) inhibit the growth of malignant melanoma and cause depigmentation of black skin. In this study we examined kinetic constants of CP and CAP as substrates for tyrosinases and their properties as sulph...

Spectral, acid-base, and redox properties of 4-mercaptoimidazoles were investigated by pulse radiolysis in aqueous solutions. Thiyl radicals of 1-methyl-5-ethyl-4-mercaptoimidazole (MEMI) have weak absorption band at 330 nm, ϵ = 300 ± 60 M−1 cm−1. Because the ionic strength variation from 0.01 ...

The relative amounts of ovothiol A (N1-methyl-4-mercaptohistidine) and trypanothione [N1,N8-bis(glutathionyl)spermidine] have been determined in all life cycle stages of representative trypanosomatids (Leishmania spp, Crithidia fasciculata, Trypanosoma cruzi and T. brucei). Ovothiol A is present...

The site-specific acid–base properties of ovothiol A disulfide (OvSSOv), the smallest hexabasic multifunctional biomolecule with complex interdependent moieties, were studied with 1H NMR-pH and potentiometric titrations. The unprecedented complexity of the protonation microequilibria could be o...

An account of antioxidant and antimicrobial characteristics displayed by ethyl acetate extract of Talaromyces purpureogenus CFRM-02 cultivated by submerged fermentation on bengal gram husk (BegH) led to the isolation of a new molecule, which was purified via silica gel column chromatography. The...

6-Fluoro-meta-tyrosine (1) was prepared from 2-fluoro-5-hydroxybenzaldehyde (6) based on an Erlenmeyer–Plöchl azlactone strategy. Products of expected metabolism of the amino acid, including 6-fluoro-meta-tyramine (2) and its O-sulfate conjugate (3), (2-fluoro-5-hydrxoyphenyl)acetic acid (4), a...

The synthesis of a series of fluorinated benzaldehydes and their use in the Wittig synthesis of fluoro-substituted stilbenes is described. 3,5-Difluoro-4-hydroxybenzaldehyde (6) and 3-fluoro-4-methoxybenzaldehyde (11) are prepared by Duff formylation of 3,5-difluorophenol and 2-fluoroanisole, re...

Fourier-Transform Laser Raman (3500-100 cm−1) and FT-IR (4000-400 cm−1) spectral measurements have been made for the solid 3-Fluoro-4-Hydroxybenzaldehyde. Geometry optimization and frequency calculations performed at two levels namely, RHF/6-31G* and B3LYP/6-31G* have yielded Cs symmetry with en...

Polymer fibers have been used as biofilm carriers and membrane materials for wastewater treatment. However, little information was available about its chemical modification using quinone compounds for accelerating biotransformation of refractory pollutants. Present studies show that poly(ethylen...

Visible-light photocatalytic degradation of tetracycline was investigated by functional modified ZnIn2S4 via anthraquinone-2-sulfonate (AQS) doped polypyrrole (PPy). The best photocatalytic activity of AQS/PPy-ZnIn2S4 composite photocatalyst was obtained when the weight ratio of AQS/PPy versus Z...

An in situ photochemical fluorescence probe method for the determination of DNA with sodium 9,10-anthraquinone-2-sulfonate (AQS) as a photochemical fluorescence probe was developed. It was based on the conversion of AQS into an intensively fluorescent product by irradiating with UV radiation. Th...