Malachite green, a synthetic antimicrobial dye, has been used for over 50 years in mycobacterial culture medium to inhibit the growth of contaminants. The molecular basis of mycobacterial resistance to malachite green is unknown, although the presence of malachite green-reducing enzymes in the cell envelope has been suggested. The objective of this study was to investigate the role of lipoprote...

Mycobacterium avium, Mycobacterium intracellulare, Mycobacterium scrofulaceum, Mycobacterium marinum, and Mycobacterium chelonae tolerate high concentrations of the dyes malachite green and crystal violet. Cells of strains of those species decolorized (reduced) both malachite green and crystal violet. Because decolorized malachite green lacked antimicrobial activity, the resistance of these myc...

Malachite green is an extensively used biocide in the aquaculture industry world-wide. It has been widely used due to lack of a proper alternative. Pyceze, however, is a pharmaceutical alternative to malachite green, with bronopol as its active ingredient. The catfish Heteropneustes fossilis were exposed for four days to 1/5th of LC50 values of each of malachite green (0.24mg/l) and Pyceze (0.4...

Transport of the organic molecule malachite green, across a bilayer of dioleoylphosphatidylglycerol liposome in aqueous Ž . solution, has been observed using a new method, namely second harmonic generation SHG . Following the rapid mixing of liposome and malachite green solutions, a decay of the SHG signal in time is observed as the malachite green bound to the outer liposome surface crosses to...

BACKGROUND Malachite green chloride is a dye used to prevent fungus infections in commercial fisheries. Leucomalachite green is formed from malachite green and remains in the tissues of exposed fish. We studied the effects of malachite green on female rats and female mice, and the effects of leucomalachite green on male and female rats and female mice, to identify potential toxic or cancer-rela...

Exposure to malachite green (MG) may pose great health risks to humans; thus, it is of prime importance to develop fast and robust methods to quantitatively screen the presence of malachite green in water. Herein the application of extractive electrospray ionization mass spectrometry (EESI-MS) has been extended to the trace detection of MG within lake water and aquiculture water, due to the int...

Malachite green and formalin were investigated as prophylactic dip treatments for developing embryos of Cyprinus carpio and Clarias gariepinus. Based on the findings, recommendations are made on the respective concentrations to be used and exposure periods to be followed for both formalin and malachite green for both fish species.

The removal of toxic dye such as malachite green from waste water by adsorption using activated carbons received much interest. However, the success of this approach depends on economic feasibility, which can be obtained by optimization of the environmental conditions. This paper evaluates the use of low cost Calatropis gigantis bark carbon to eliminate malachite green from aqueous solutions. T...

Stability relations of malachite and azurite are calculated and shown in Eh-pH diagrams, using AF (Gibbs free energy) values listed in Garrels and Christ (1965). The malachite/azurite transition is very sensitive to small chemical changes in the environment: equilibrium is reached at Pco2 = 10-a4s atm., i.e. close to normal values, whereas the precipitation of both minerals from cupric-ion-bear...