A novel iron(III) complex [Fe(SF)](ClO(4))(3).2H(2)O; in which SF = N,N(0)-bis{5-[(triphenylphosphonium chloride)-methyl] salicylidene}-o-phenylenediamine) has been synthesized and characterized using different physicochemical methods. The binding of this complex with calf thymus (CT) DNA was investigated by circular dichroism, absorption studies, emission spectroscopy, voltammetric studies, an...

showed no respiration due to endogenous substrates. Only L-ascorbate with NNN‘N’tetramethyl-p-phenylenediamine was oxidized by membrane particles and the specific activity obtained was lower than in corresponding particles prepared from NH4+-grown cells. Low-temperature reduced-minus-oxidized difference spectra (Fig. 1, trace b) suggested that this lack of electron-transport activity may be due...

We present the structures of bovine catalase in its native form and complexed with ammonia and nitric oxide, obtained by X-ray crystallography. Using the NO generator 1-(N,N-diethylamino)diazen-1-ium-1,2-diolate, we were able to generate sufficiently high NO concentrations within the catalase crystals that substantial occupation was observed despite a high dissociation rate. Nitric oxide seems ...

We have previously reported that the addition of para-phenylenediamine (PPD) to the glycerol used for mounting preparations stained for immunofluorescence with FITC conjugates results in a marked retardation of the fading that occurs during fluorescence microscopy. Studies of the kinetics of this photo-bleaching performed by microfluorimetry and on FITC conjugate in solution and the effects of ...

A series of heterocyclic acene diimides were synthesized effectively based on the condensation of o-phenylenediamine, 1,2-benzenedithiol, and 2-aminothiophenol with 2,3,6,7-tetrabromo-1,4,5,8-naphthalene tetracarboxylic diimide. The diimides exhibit interesting optical and electrical properties with one of them showing a hole mobility up to 0.02 cm(2) V(-1) s(-1).

A novel electrochemical immunosensor array for the simultaneous detection of multiple tumor markers was developed by incorporating electrochemically addressing immobilization and one signal antibody strategy. As a proof-of-principle, an eight-electrode array including six carbon screen-printed working electrodes was used as a base array for the analysis of two important tumor markers, carcinoem...

BACKGROUND The factors influencing elicitation responses in individuals allergic to p-phenylenediamine (PPD) in hair dyes are not well understood. OBJECTIVES Investigation of the elicitation response to the new, less-sensitizing PPD alternative 2-methoxymethyl-p-phenylenediamine (ME-PPD) under simulated hair dye use conditions. METHODS The cross-elicitation response to ME-PPD (2% in a hair ...