Mycobacterium sp. strain HL 4-NT-1, isolated from a mixed soil sample from the Stuttgart area, utilized 4-nitrotoluene as the sole source of nitrogen, carbon, and energy. Under aerobic conditions, resting cells of the Mycobacterium strain metabolized 4-nitrotoluene with concomitant release of small amounts of ammonia; under anaerobic conditions, 4-nitrotoluene was completely converted to 6-amin...

A simple, rapid, and specific spectrophotometric method was developed for the determination of paracetamol in pure form drug formulations. The depended on hydrolysis to p-aminophenol, which, oxidized under effect dissolved oxygen benzoquinoneimine. In alkaline medium, benzoquinoneimine reacts with Methyldopa produce a high stabile indophenol dye. absorbance measured at 580 nm, molar absorptivit...

In view of the role ascribed to the peroxidatic activity of degradation products of cytochrome c (cyt c) in the processes of apoptosis, we investigate the catalytic potential of heme and of the cyt c derived heme peptide MP-11 to catalyse the cathodic reduction of hydrogen peroxide and to oxidize aromatic compounds. In order to check whether cyt c has an enzymatic activity in the native state w...

A series of titanium trichloride complexes , ligated with claw-type tetradentate aminophenolate ligands were synthesized from the direct reaction of TiCl4(THF)2 with 1 equiv. of the corresponding aminophenol in the presence of triethylamine. For comparison purposes, titanium isopropoxide complexes were also synthesized via the reaction of Ti(O(i)Pr)4 and 1 equiv. of the proligand. Similar react...

Carbon fiber paper (CFP), a material frequently used as the diffusion layer in fuel cells, was found recently to exhibit a potential as an electrode for the development of sensitive, unmediated biosensors. After nitrogen plasma treatment, the CFP exhibited a quasi-reversible behavior to the redox couple (e.g., ferricyanide) with an electron transfer rate constant of 7.2 × 10(-3)cms(-1). This ra...

Condensation of 1-(9-alkyl-9H-carbazol-3-yl)-4-carboxy-2-pyrrolidinones with 2,3-diaminonaphthalene or o-aminophenol was carried out by melting a reaction mixture at 170–230 °C and provided new 2-substituted naphtho[2,3-d]imidazole and benzoxazole derivatives. Derivatives of 2-substituted naphtho[2,3d]imidazole were alkylated with an excess of ethyl iodide in the presence of potassium hydroxide...

A new nortriterpenoid, 19(R)-hydroxyl-wuweizidilactone H (1), and a sesquiterpene, (6R)-β-chamigrenic acid (2), together with one known nortriterpenoid, wuweizidilactone H (3), and three known hepatoprotective lignans, micrantherin A (4), gomisin M₂ (5) and schizandrin (6) were isolated from the fruit of Schisandra chinensis. Their structures were elucidated by UV, IR, HRESIMS, NMR spectra and ...

We have developed an ammonia-sensitive material by coupling the Berthelot reaction to our polymerized crystalline colloidal array (PCCA) technology. The material consists of a periodic array of highly charged colloidal particles (110 nm diameter) embedded in a poly(hydroxyethyl acrylate) hydrogel. The particles have a lattice spacing such that they Bragg-diffract visible light. In the Berthelot...