Organic dyes were used very extensively as anti-infective agents before the discovery of the sulfonamides and the antibiotics. A few cationic dyes still find limited use as anti-infectives. These include the triphenylmethane dyes gentian violet and basic fuchsin and the thiazine dye methylene blue. The dyes form colorless leucobase forms under alkaline conditions. Cationic dyes are active against Gram-positive bacteria and many fungi; Gram-negative bacteria are generally resistant. The difference in susceptibility is probably related to the cellular characteristics that underlie the Gram stain.

Conquering Fear In The 21th Century

Conquering Fear In The 21th Century

The Ultimate Guide To Overcoming Fear And Getting Breakthroughs. Fear is without doubt among the strongest and most influential emotional responses we have, and it may act as both a protective and destructive force depending upon the situation.

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