The effect of green tea extracts on the sporulation of oocysts of 3 species of Eimeria was investigated. The unsporulated oocysts were exposed to 0%, 5% and 10% of green tea extracts (1 and 2% strengths, w/v). A new sporulation inhibition bioassay was designed to evaluate the anticocccidial activity of the tea extracts. The results showed for the first time that water-soluble extracts from gree...

It has been established by a number of investigators that definition of the pH optimum (in addition to the temperature and the concentration of the substrate and the enzyme) without specification of the ion species or its activity does not fully characterize an enzyme reaction. For example, as early as 1934, Howell and Sumner (1) showed that the pH optimum of urease activity was dependent on th...