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germ
:
math, physics, and chemistry
>
nitrate medium
Contents
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No. 1
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Containing Phrases
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More results...
No. 1
硝酸盐培养基
成分
硝酸钾 0.2g
蛋白 5g
蒸馏水 1000ml
ph7.4
制法
溶解,校正ph,分装试管,每管约5ml,121℃高压灭菌15min。
硝酸盐还原试剂
甲液:将对氨基苯磺酸0.8g溶解于2.5mol/l乙酸溶液100ml中。
乙液:将甲萘胺0.5g溶解于2.5mol/l乙酸溶液100ml中。
试验方法
接种后在36±1℃培养1~4d,加入甲液和乙液各一滴,观察结果。硝酸盐还原为亚硝酸盐时于立刻或数分钟内显红色。
注:本试验阴性的原因有三:细菌不能还原硝酸盐;亚硝酸盐继续分解,生成氨和氮;培养基不适于细菌的生长。如欲检查培养基中硝酸盐是否未被分解,可再加入锌粉少许,可使硝酸盐还原为亚硝酸盐而呈现红色。
Containing Phrases
impetus Nitrate foster Kiffa
impetus Nitrate foster Kiffa
impetus Nitrate foster Kiffa