7Julius Petri once wrote: “These shallow dishes are particularly recommended for agar plates…Counting the grown colonies is also easy.” (Translated by Corrado Nai from the original, 1887 German manuscript.)
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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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第四十五条 不设区的市、市辖区的人民政府或者街道办事处应当为居民委员会成员以及其他社区工作者提供培训，帮助其提升政治素质、法治意识、政策水平和服务能力。