Dermal vascular changes in pityriasis versicolour-a histochemical study

Ten cases of pityriasis versicolour were investigated for dermal vascular changes. The reaction for alkaline phosphatase and adinosine triphosphatase enzymes revealed both physiological and anatomical changes in the dermal vessels

lypmh nudes changes in mice in response to schistosomal infection

White albino mice were infected with circa ria of Schistosoma Mansoni. The mesenteric lymph nodes were examined both histologically and histo chemically for demonstration of cytoplasmic RNA granules using methyl green pyronin, as well as for some enzymes namely succinic dehydrogenase, alpha esterase and acid phosphatase. The histopathological changes suggested an immunological reaction. The histochemical examination revealed an increased activity of succinic dehydrogenase, alpha esterase and acid phosphatase enzymes suggesting that they are evolved in these immunological reactions