The jelly is chemically inert since no additives are needed for gelation. This allows chemicals dissolved in the jelly’s aqueous phase to diffuse well, a prerequisite for testing if certain species or strains are resistant to antibiotics or antifungals. In these simple assays, zones of growth inhibition of bacteria or fungi (or their absence) point to the effectiveness of (or resistance towards) antibiotics or antifungals.
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An example of dithering using random noise. Top to bottom: original gradient, quantised after dithering, quantised without dithering.，推荐阅读爱思助手下载最新版本获取更多信息
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