Article Abstract:
Cercosporin derives its toxicity from its ability to form superoxides in the presence of light. This phytotoxin causes harm to plants, mice and many other fungi but not to the Cercospora species that produce it. The molecular mechanism behind the fungal pathogens' resistance against the toxin involves the oxidation-reduction reaction in its biological system which correlates to its mechanism of defense. Results of studies show that reduction reaction occurs at the cell surface reducing environment which renders the toxin unstable. After it diffuses away from the reducing power of the cell surface, it reoxidizes and becomes toxic. This transient reduction and detoxification protect the fungi that produce it.
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Article Abstract:
Research was conducted to determine and identify amanitins in the wood-rotting fungi Galerina fasciculata and G helvoliceps. Over 600 strains of wood-rotting fungi were screened which yielded three strains of G fasciculata and 18 strains of G helvoliceps with amanitins. Results indicate that the purified amanitin fractions from the species were identical to authentic amanitins, suggesting that the two species must be handled as poisonous mushrooms.
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Article Abstract:
In fish vaccination programs against vibriosis, it is necessary to include Vibrio anguillarum strains representing O1, O2-alpha, O3A and O3B causing the disease in the formulation of vaccines. Dot blot, slide agglutination and quantitative agglutination test shows that O1 V. anguillarum isolates formed a homogenous group whereas there were two different patterns of serological reactions in O2 and O3 serotypes.
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