By cosedimentation, spectrofluorimetry, and electron microscopy, we have established that actin is induced to polymerize at low salt concentrations by positively charged liposomes. This polymerization occurs only at the surface of the liposomes, and thus monomers not in direct contact with the liposome remain monomeric. The integrity of the liposome membrane is necessary to maintain actin in it...

The hybrid plasmid-virus pSSVx from Sulfolobus islandicus presents an open reading frame encoding a 76 amino acid protein, namely Stf76, that does not show significant sequence homology with any protein with known 3D structure. The recombinant protein recognizes specifically two DNA-binding sites located in its own promoter, thus suggesting an auto-regulated role of its expression. Circular dic...

A New, simple, sensitive and economical spectrofluorimetric method for estimation of Desvenlafaxine Succinate, a novel SNRI (serotonin norepinephrine reuptake inhibitor) in bulk and in solid dosage form was developed in the present study. Desvenlafaxine Succinate showed excitation at 274 nm and emission at 305 nm in pH=6 phosphate buffer which was used in this study. The linear regression equat...

A rapid, novel spectrofluorimetric method to determine epristeride (EP) in biological fluids and a pharmaceutical formulation was developed, based on the fact that fluorescence intensity of l-tryptophan could be quenched by EP in the medium of pH=9.0. The various factors influencing fluorescence quenching were discussed. The quenching mechanism was investigated with the quenching type, synchron...

The illicit addition of phosphodiesterase type-5 (PDE-5) inhibitors like sildenafil (Viagra) in product offered as herbal medicine or dietary supplement for male erectile dysfunction has concerned authorities in recent times. In this paper, we proposed a sensitive surfactant-coated Amberlite XAD™ resin for sildenafil preconcentration method with spectrofluorimetric detection. Retention capacity...

Albumin is a globular protein of plasma mammalian blood participating in transport hydrophobic metabolites and drugs. Thus, studies devoted to its binding are valuable as part evaluation new potential drugs or fluorescent probes for vivo usage. Here we describe results concerning synthesis bovine serum albumin assay both silico (docking) vitro (spectrophotometric spectrofluorimetric titrations)...

Simple, accurate, sensitive and selective spectrofluorimetric, atomic absorption spectrometric and spectrophotometric methods are described for the quantitative determination of ten fluoroquinolones (amifloxacin, ciprofloxacin hydrochloride, difloxacin hydrochloride, enoxacin, enrofloxacin, lomefloxacin hydrochloride, levofloxacin, norfloxacin, ofloxacin and pefloxacin mesylate). The first meth...

Pueraria tuberosa (Roxb. ex. Willd.) DC. (Fabaceae) is the important plant used in Indian medicine, commonly known as Vidarikand. The plant is described as rasayana and tonic in Ayurvedic Pharmacopoeia of India (1). It is an extensive perennial climber, growing throughout tropical parts of India, mostly in moist regions, monsoon-forests and coastal tracts (2). The tuber of pueraria is sweet in ...