Monitoring system of water quality at present should be concentrated on chi - ka - wan river and wu - lin river , with emphasis on the changes of dissolved oxygen , biochemcal oxygen demand and ammonia 水质监测站以设立于第一、第四与第五站为宜，监测项目则以溶氧、水温、氨态氮、 bod与肠内菌为主。
The machine is helpful to enhance water quality , improve dissolved oxygen concentration in water and water convectional circulation , with strong water - stir capability , which is the key equipment for pond farming 该机对改良水质，增加水体溶氧条件效果极佳，提水搅水能力强，水体循环对流状况好，是内塘养殖的关键设备。
The radiation frequency is 1012 / per second , can penetrate fuel molecules to perform resonance . after performin resonance , to generate iron , increase oxygen and break down fuel molecules 每秒放射频率有1012秒（兆次）以上，可穿透油管，打破油分子，分子与分子产生核磁共振，共振后会产生负离子、增加溶氧量并提升雾化效果，促进完全燃烧。
The activated - sludge bioreactor was adopted to degrade the restaurant wastewater . the effects of the dissolved oxygen ( do ) , the mean cell residence time ( c ) ， the aeration time and the load of sludge on bioreactor were studied 采用活性污泥生物反应器对餐饮废水进行处理，考察了溶氧浓度、细胞平均停留时间、曝气时间以及污泥负荷对反应器处理效果的影响。
Improved substrate : activated sludge to improve the bottom of the anaerobic environment , greatly reduce the hydrogen sulfide produced , the lower organic oxygen consumption and improve dissolved oxygen , water conditioning stability ph value 改良底质：活化污泥，改善池底的厌氧环境，大大减少硫化氢产生，降低有机物耗氧量，提高溶氧，调节稳定水体ph值。
In this paper , the effect of plant cell aggregates , oxygen supply and gas composition , broth rheology , and hydrodynamic stress on plant cell growth and metabolite production in plant cell culture was discussed in detail 本文针对植物细胞培养的基本特点，详细讨论了与大规模生产有关的工程技术方面的问题，如植物细胞聚集、溶氧及气体成分、流体性能、剪切力对植物细胞培养产生的影响。
The effects of hydrofoil impeller on erythromycin fermentation and variation of fermentation parameter such as broth viscosity , dissolve oxygen , fermentation unit , power consumption on the scale of 20 ton fermentor , etc . with time were studied 摘要在20t工业发酵罐中，研究了翼形轴流桨搅拌对红?素发酵过程的影响，重点考察了粘度、溶氧、效价等过程参数变化，以及搅拌功耗与发酵产量之间的关系。
The results showed that process parameters varied with time in fermentation was distinct for different agitator and the hydrofoil impeller instead of the disc turbine impeller might significantly reduce power consumption under the same condition 研究结果表明： ( 1 )与传统的涡轮搅拌桨相比，翼形轴流桨搅拌其发酵过程参数（粘度、溶氧、效价等）随时间的变化曲线有明显的差异； ( 2 )在相同的生产条件下，用冀形轴流桨代替涡轮桨可有效提高生产效率。
It indicated that not only can spirulina cells grow photoautotrophically and photomixtrotrophically , but also can grow heterotrophically under some specific conditions . light intensity , light quality , temperature , species and concentration of metals , rare earth elements and vitamins , salinity , cell concentration , dissolved oxygen level and magnetic filed etc . , all play important roles in photosynthetic performance and cell productivity of spirutina 认为螺旋藻细胞不但能进行光合自养和混合营养生长，而且在某些特定的环境条件下，还能进行异养生长；光照强度、光质、温度、金属元素、稀土元素、盐度、藻体细胞浓度、溶氧水平、维生素、激素和磁场等环境因素对螺旋藻细胞的光合性能和细胞产率都有显著影响。
