The antibacterial action of cationic polypeptides has been found to be correlated with changes which they produce in the cytochemical reactions of the bacterial cells. Bacterial cells ordinarily stain with cationic dyes at pH values above 7. Treatment with cationic polypeptides rendered them stainable with the anionic dye fast green at pH 8.1. This change occurred parallel to loss of bacterial ...

Indium Phosphide QuantumDots (InP QDs) have emerged as an alternative to toxic metal ion based QDs in nanobiotechnology. The ability to generate cationic surface charge, without compromising stability and biocompatibility, is essential in realizing the full potential of InP QDs in biological applications. We have addressed this challenge by developing a place exchange protocol for the preparati...

Indium Phosphide Quantum Dots (InP QDs) have emerged as an alternative to toxic metal ion based QDs in nanobiotechnology. The ability to generate cationic surface charge, without compromising stability and biocompatibility, is essential in realizing the full potential of InP QDs in biological applications. We have addressed this challenge by developing a place exchange protocol for the preparat...

Methylene blue (MB) is a typical cationic dye, causing significant color changes in water bodies even small dissolved amounts, as well affecting the survival of neighboring plants and...

Cationic liposomes are frequently used as carrier particles for nucleic acid delivery. The most popular formulation is the equimolar mixture of two components, a cationic lipid and a neutral phosphoethanolamine. Its uptake pathway has been described as endocytosis. The presence of an aromatic molecule as a third component strongly influences the cellular uptake process and results in complete m...

A 1D anionic lanthanide coordination polymer {[(CH(3))(2)NH(2)] [(H(2)abtc)(2)Ho(H(2)O)]}n () (H(4)abtc = 3,3',5,5'-azobenzene-tetracarboxylic acid) has been synthesized under hydrothermal reaction conditions. The protonated [(CH(3))(2)NH(2)](+) is generated from decomposed DMA during the reaction, and balances the negative charge of the framework. The as-obtained samples were characterized usi...

We recently reported1 the isolation and structural characterization of a novel cationic chlorine–aromatic complex in which the chlorine atom is directly bonded to a single aromatic carbon atom in a manner similar to that qualitatively described for Wheland intermediates in electrophilic aromatic chlorinations.2 The lability of the C–Cl bond in the highly colored (red) chloroarenium cation (1–Cl...

Solvent extraction–spectrophotometries based on ion association formation have been established for the improvement of the sensitivity for the determination of ionic compounds such as anionic and cationic surfactants using hydrophobic dye ions. For example, anionic surfactants were determined using Methylene Blue,1 Ethyl Violet,2 Co(III)-5-Cl-PADAP3 and Malachite Green.4 Bromocresol Green,5 2,6...

Intercalation products based on ionic exchange reaction between cationic dye methylene blue and Na-montmorillonite were prepared. Montmorillonite particles intercalated with methylene blue were characterized using X-ray diffraction, infrared spectroscopy, elemental and thermo-gravimetric analysis. The results showed that intercalation of dye molecules within the interlayer spaces of montmorillo...

The effect of cationic modification of cotton fabrics, using cationic agent (Chromatech 9414) on direct dyeing characteristics was studied in this work. Cationization of cotton fabric at different conditions (pH, cationic agent concentration, temperature and time) was investigated and the optimum conditions were determined . Nitrogen content of cotton samples pretreated with cationic agent was ...