所谓厌氧(anaerobic)作用是指绝对的无氧(溶解氧DO=0)，而缺氧(anexic)作用是指无氧或微氧(DO<0.3-0.5mg/l)。 相对厌氧处理而言，水解反应的水力停留时间较短，反应一般在4-18小时完成。
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而缺氧诱导因子 hypoxia-inducible factors ; HIF
而缺氧预处理 anoxicpreconditioning
而提出缺氧后处理 Hypoxic postconditioning
而多拷贝缺氧反应元件 Hypoxic Response Element ; HRE
进而提出缺氧后处理 Hypoxic postconditioning
单纯的脑震荡可引起短时间的知觉丧失，而缺氧可以造成长达数周的昏迷，并常致命。
Simple concussions cause short losses of consciousness. Coma from lack of oxygen may last several weeks and is often fatal.
含氮杂环化合物存在于多种工业废水和城市污水中，而缺氧反硝化是一种重要的生物处理手段。
Nitrogenous heterocyclic compounds exist in many kinds of industrial wastewaters and municipal wastewaters. Anxic denitrification is an important biological treatment process for wastewaters.
结果NO对PC12细胞可以产生剂量依赖性的直接毒性作用，而缺氧预适应小鼠脑匀浆提取液能有效对抗NO神经毒性作用。
Results Nitric oxide was directly toxic to PC12 cells in a dose-dependent manner, and brain tissue homogenate extracts taken from hypoxia preconditioned mice could prevent PC12 cells from NO toxicity.
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