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硝酸盐浓度     
相关语句
  nitrate concentration
     after anaerobic process and denitrification for about 60 min,the nitrate concentration was basically lower than 0.08mg/L;
     厌氧,反硝化经过60min左右后,硝酸盐浓度基本在0.08mg/L以下。
短句来源
     However, the inhibition was not so obvious when nitrate concentration was high (210mg/L and 280mg/L).
     但当NO3-N浓度较高(210mg/L和280mg/L)时,高浓度磷化氢对硝酸盐转化的抑制不明显,提高硝酸盐浓度可缓解磷化氢的抑制效应.
短句来源
     Nitrite production was proportional to nitrate concentration up to 250 μmol/L.
     亚硝酸盐产量正比于硝酸盐浓度至250μmol/L。
短句来源
     The expression of nirS was induced by nitrate. Nitrogenase activity was highest in the presense of 1.0mmol/L nitrate concentration, about 12900 Units, hi the presence of too high nitrate concentration (10 mmol/L) or too low nitrate concentration (0.1 mmol/L), nitrogenase activity is about 3500 units.
     而硝酸盐能诱导其表达,在硝酸盐浓度为1mmol/L时,表达活性最高,达12900units。 当硝酸盐浓度较低(0.1mmol/L)或较高(10mmol/L)时,表达活性约为3500units。
短句来源
     (Salinity) and nitrate concentration did not correlate with the diel variation of DMS,DMSP and DMSO.
     海水中的盐度和硝酸盐浓度与DMS,DMSP和DMSO浓度的周日变化均不相关.
短句来源
更多       
  the concentration of nitrate
     When the concentration of nitrate was limit factor in reactor, the PHB stored in the cell of denitrifying phosphorus removal bacteria could not be oxidized fully, which led the decrease of efficiency of phosphate removal.
     当硝酸盐浓度较低 ,不足以氧化反硝化聚磷菌细胞内的 PH B从而导致体系反硝化除磷效率的下降。
短句来源
  concentration of nitrate
     However, the nitrogenase activity dramtically decreases and is inactivated by increasing concentration of nitrate.
     固氮酶活性则相反,随硝酸盐浓度增加而急剧下降,直至全部丧失。
短句来源
     The effects of concentration of nitrate and ligands and pH variation and other factors on the characteristics of the catalytic reduction wave were also discussed.
     还讨论了硝酸盐浓度,配位体和pH变化等因素对催化还原波特性的影响。
短句来源
     When the concentration of nitrate was limit factor in reactor, the PHB stored in the cell of denitrifying phosphorus removal bacteria could not be oxidized fully, which led the decrease of efficiency of phosphate removal.
     当硝酸盐浓度较低 ,不足以氧化反硝化聚磷菌细胞内的 PH B从而导致体系反硝化除磷效率的下降。
短句来源
     The regression relation of amount of Potassium with the nitrate concentration of Brassica chinensis were a equation of double-parabola , The amount of Potassium fertilization exist a best suitable point with nadir concentration of nitrate.
     与施K量的关系,则呈一元2次或3次的回归关系,存在硝酸盐浓度最低点的施K量最适点;
  nitrate concentrations
     Rates of nitrification and denitrification increased with increasing ammonium and nitrate concentrations.
     在一定范围内硝化和反硝化速率随着氨浓度和硝酸盐浓度的增加而增加。
短句来源
     Two microalgae, Thalassiosira weissflogii and Dunaliella salina were grown in modified K-medium with two nitrate concentrations,800μmol/L and 200μmol/L,variations of nitrate and nitrite in the culture mediums and nitrate reductase activity of cells were investigated comparatively.
     把盐生杜氏藻(Dunaliellasalina)和威氏海链藻(Thalassiosiraweissflogii)培养在两种硝酸盐浓度下(800μmol/L和200μmol/L),比较研究了它们在培养液中硝酸盐及亚硝酸盐的变化及细胞硝酸还原酶活力变动情况.
短句来源
     While nitrogen applied at 33 g/(m2.yr), 40 g/(m2.yr) or even higher, increase phosphate application rate will reduce nitrate concentrations in the leachate.
     但是当年纯氮施用量为33g/m~2、40g/m~2或更高水平时,随着施磷量的增加,淋溶水中硝酸盐浓度有降低趋势,而且施氮量水平越高,其降低趋势越明显。
短句来源
     Nitrate concentrations in the leachate were not effected by increasing phosphate application rate if nitrogen applied at low rate (20 g/(m~2.yr)).
     当年纯氮施用量为20g/m~2时,随着施磷量的增加淋溶水中硝酸盐浓度基本没有变化;
短句来源
     The assessment results are well consistent with the measured and predicted nitrate concentrations in this area.
     评价结果与该地区实测及预测的硝酸盐浓度分布状况吻合较好 .
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      nitrate concentration
    But the rate decreased by 17% when nitrate concentration increased to 16 mmol/L, in contrast to the control.
          
    4) In general, Fv/Fm increased as nitrate concentrations increased from 1 to 8 mmol/L, and continuous increase of nitrate concentration resulted in decrease in Fv/Fm.
          
    Irrespective of the exogenous nitrogen concentration (0, 11.2, or 25 mM NO-3), nitrate concentration in the nodules was low as compared to the plant roots, leaves, and stems.
          
    Solubility of UO2(NO3)2, TBP, and its degradation products in the organic and aqueous phases of the system TPB-H2O-HNO3-UO2(NO3)2 at 25-128°C over the uranyl nitrate concentration range 200-1200 g 1-1 is studied.
          
    Influence of Acidity and Uranyl Nitrate Concentration on the Efficiency of Recovery of Uranium(VI) from Aqueous Solutions with H
          
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      the concentration of nitrate
    The concentration of nitrate complexes on Pt,CU/ZrO2-PILC was higher and the strength of their bond to the surface was weaker than those on unmodified ZrO2-PILC.
          
    The concentration of nitrate in estuaries is controlled through a physical mixing process and is also affected by biotic activity.
          
    The increase in nitrate reductase activity is prevented by small quantities of ammonium; this inhibition is overcome, in part, by raising the concentration of nitrate.
          
    Cell yields from sulphate-limited cultures were proportional to the concentration of nitrate added with a yield coefficient of 28.0 g bacterial dry weight per mol of nitrate reduced.
          
    After acquisition of spectral data for a sample, without added reagent or pretreatment at 1 nanometer intervals between 205 and 250 nm, a computational procedure gives in a few seconds the concentration of nitrate.
          
    更多          
      concentration of nitrate
    At the high concentration of nitrate fed in the anoxic stage, the longer anoxic time needed, the better the DNPA was.
          
    The catalytic activity was affected by pH, catalyst amount used, concentration of sodium formate, and initial concentration of nitrate.
          
    The concentration of nitrate complexes on Pt,CU/ZrO2-PILC was higher and the strength of their bond to the surface was weaker than those on unmodified ZrO2-PILC.
          
    Kinetic measurements were performed for a low concentration of nitrate (0.4 × 10-3-3.2 × 10-3 mol dm-3) and the temperature range 293-313 K.
          
    The concentration of nitrate in estuaries is controlled through a physical mixing process and is also affected by biotic activity.
          
    更多          
      nitrate concentrations
    The experimental results are listed below: 1) 5-aminolevulinic acid (ALA) synthetic rate increased as nitrate concentrations supplied to larch seedlings increased from 1 to 8 mmol/L.
          
    The total nitrogen contents in leaves increased as nitrate concentrations increased.
          
    When nitrate concentrations increased from 1 to 8 mmol/L, soluble protein contents in leaves increased in general, and continuous increase of nitrate concentrations induced a decrease in soluble protein contents in leaves.
          
    4) In general, Fv/Fm increased as nitrate concentrations increased from 1 to 8 mmol/L, and continuous increase of nitrate concentration resulted in decrease in Fv/Fm.
          
    As nitrate concentrations increased from 1 to 8 mmol/L, photosynthetic rates gradually increased, but when nitrate concentrations increased to 16 mmol/L, photosynthetic rate reduced by 16%, in contrast to the control.
          
    更多          


    Enterobacter cloacae, which was isolated from root system of rice plants in Guangdong Province, possesses active nitrogenase activity. It is a facultative anaerobic bacteria. E. cloacae produces lactate, a peptide-containing compound and gas mixture during growth. The gas mixture consists of hydrogen, carbon dioxide, ammonia and other unkown gases. In E. cloacae the nitrate-reducing system was induced by nitrate. The nitrate reductase activity increases with increasing concentration of nitrate in culture medium....

    Enterobacter cloacae, which was isolated from root system of rice plants in Guangdong Province, possesses active nitrogenase activity. It is a facultative anaerobic bacteria. E. cloacae produces lactate, a peptide-containing compound and gas mixture during growth. The gas mixture consists of hydrogen, carbon dioxide, ammonia and other unkown gases. In E. cloacae the nitrate-reducing system was induced by nitrate. The nitrate reductase activity increases with increasing concentration of nitrate in culture medium. However, the nitrogenase activity dramtically decreases and is inactivated by increasing concentration of nitrate. Nitratedependent nitrogenase activity has also been shown in E. cloacae under severe oxygen-limited condition.

    从广东省水稻根际分离出的阴沟肠细菌是一种兼性厌氧细菌。它具有较高的固氮能力。在培养过程中产生乳酸和氢、二氧化碳、氨等大量气体,并能排出一些含肽物质。在好气条件下,介质中硝酸盐能诱导形成硝酸还原酶,其活性随硝酸盐浓度增加而升高,硝酸盐浓度过高时抑制其活性。固氮酶活性则相反,随硝酸盐浓度增加而急剧下降,直至全部丧失。在厌氧条件下E.cloacae具有需硝酸的固氮活性。

    In the paper, two different processes, granular activated carbon adsorption ("C"process) and Ozonation-activated carbon adsorption ("O_3 + C"process), were studied experimentally for removal of three forms of nitrogen from potable water on a comparative way. The results indicate that the ozonation is capable of oxidizing organic nitrogen into NH_3-N, and NO_2~--N into NO_3~--N, thus resulting in the increase of their content in the effluent. It was also found out that the ammonium nitrogen was effectively removed...

    In the paper, two different processes, granular activated carbon adsorption ("C"process) and Ozonation-activated carbon adsorption ("O_3 + C"process), were studied experimentally for removal of three forms of nitrogen from potable water on a comparative way. The results indicate that the ozonation is capable of oxidizing organic nitrogen into NH_3-N, and NO_2~--N into NO_3~--N, thus resulting in the increase of their content in the effluent. It was also found out that the ammonium nitrogen was effectively removed in the activated carbon beds by the mechanisms of microbiological assimilation and nitrification. However, in the"C"process, the nitrification process was dominated by the nitrite forming stage, and consequently the nitrite concentration of the effluent from the carbon bed is much higher than that of influent. Meanwhile, the carbon bed of the "C"process exhibited considerably high removal efficiency for nitrate. This is considered to be due to the mechanisms of biological denitrification and reduction of nitrate by a biodegradation product, alcoholic cthyl acid, into N_2 under the oxygen deficient condition in the carbon bed. In the "O_3 + C"process, the nitrification process was carried to the end with formation of nitrate under oxygen-sufficient conditions in the carbon bed. As a result, the nitrate concentration in the effluent increased markedly over the influent. The increased hydrogen ions, H~+ resulted from nitrification can be neutralized by the hydroxide ions, OH~+ dissociated from the carboxide groups on the activated carbon surface, thus preventing the effluent pH from dropping significantly.

    本文对粒状活性炭吸附法和臭氧一活性炭吸附法两种处理流程(简称“C”流程和“O_3+C”流程)进行了从饮用水中去除三态氮的对比试验。结果表明,臭氧化能够将有机氮氧化成氨氮;亚硝酸盐氮氧化成硝酸盐氮,从而使它们在出水中的含量增加。试验还发现,在活性炭滤床中通过生物同化和硝化作用等机理有效地除去了氨氮。但是在“C”流程中硝化过程以亚硝化阶段为主,使出水中亚硝酸盐浓度远大于进水浓度。同时,“C”流程具有相当的硝酸盐去除率。

    Effects of nitrate and nitrite on vegetable growth were investigated by solution culture in different proportions of NO_3-N and NO_2-N (12:0, 8:4, 4:8, 0:12mM)and different pH value (7, 6, 5).Tomato, euettmber, cabbage and pak choi were used as material. Results indicated that these vegetables can obviously divide into two types: 1. tomato and pak choi were sensitive to nitrite toxicity and lower the pH value the more serious of the toxic effect is. 2. cucumber and cabbage were not very sensitive to the nitrite...

    Effects of nitrate and nitrite on vegetable growth were investigated by solution culture in different proportions of NO_3-N and NO_2-N (12:0, 8:4, 4:8, 0:12mM)and different pH value (7, 6, 5).Tomato, euettmber, cabbage and pak choi were used as material. Results indicated that these vegetables can obviously divide into two types: 1. tomato and pak choi were sensitive to nitrite toxicity and lower the pH value the more serious of the toxic effect is. 2. cucumber and cabbage were not very sensitive to the nitrite toxicity. Accumulation of nitrate and nitrite in plants would be increased when concentration of nitrate and nitrite in solution were increased. Leaf vegetables accumulated more nitrate and nitrite then fruit vegetables. If a large amount of NO_2-N was applied, unnormal accumulation of individual amino acid would be resulted in causing the metabolic disturbance of nitrogen in the vegetables. The most accumulation of amino acids was THR in tomato and ASP in pak choi.

    以番茄、黄瓜、甘蓝和小白菜为材料,用营养液栽培法研究了不同硝酸态氮(NO_3-N)与亚硝酸态氮(NO_2-N)配比(NO_3-N:NO_2-N分别为12:0,8:4,4:8,0:12mM),不同pH值(pH7、6、5三组),对蔬菜生长和NO_3-N,NO_2-N、游离氨基酸累积的影响。结果表明,这四种蔬菜明显地分为两类:番茄、小白菜易感受NO_2-N的危害,并且有随溶液中pH值的下降而受害加剧的趋势;而黄瓜和甘蓝则对NO_2-N具有较强的耐受性。供试植株内NO_3-N与NO_2-N的累积量,随营养液中硝酸盐及亚硝酸盐的浓度增大而增加。叶莱较果菜易于累积NO_3-N与NO_2-N。大量施用亚硝酸态氮肥,会导致蔬菜内个别氨基酸的异常积累,引起氮素代谢的紊乱。番茄积累最多的是苏氨酸,小白菜为天门冬氨酸。

     
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