查询词典 nitrogen-free

Nitrite nitrogen and ammonia nitrogen were the main components in the deteriorative aquaculture water.

亚硝酸盐氮和氨氮是养殖水体恶化的主要成分。

A set of in situ infrared apparatus which can beoperated at liquid nitrogen temperature is established. The structuralstudies of polyhydride of Ruthenium is carried out from roomtemperature to liquid nitrogen temperature. The structural conversion of〓 between dihydrogen and dihydride is observed firstly. It issuggested that with temperature changing, a fluxional structureconversion between terminal and bridged hydrogen appears. NMR studyand DV-Xα calculation are performed in this paper.

建立了可至液氮温度的原位红外测试装置，进行了室温至液氮温度区间钌多氢化合物的结构研究，首次发现了〓在室温存在分子氢与原子氢的结构流变，发现了新化合物存在随温度变化而出现桥氢与端氢的结构转化；进行了NMR测试及DV—〓计算。

The number of mold, bacteria, culturable microorganisms, aerobic nitrogen-fixing bacteria, anaerobic nitrogen-fixing bacteria, aerobic cellulose decomposition microbes, anaerobic cellulose decomposition microbes were the most in 16-year-old organic tea garden, and the biomass carbon and nitrification of edaphon were also the strongest.

霉菌、细菌、可培养微生物总量、好气性自生固氮菌、嫌气性自生固氮菌、好气性纤维分解菌、嫌气性纤维分解菌均以16年生茶园最多，土壤微生物生物量碳和硝化作用也以16年生茶园最强。

In order to understand the effect of the different nitrogen sources on Cu uptake, accumulation and growth of Elsholtzia splendens, nutrient solution culture experiment was conducted to compare two nitrogen sources NH4NO3 and (NH42SO4 on growth of E.splendens at three different Cu levels (Control, 50, and 200 uM).

采用营养液培养的方法研究两种氮源（NH4NO3与(NH4)2SO4）对海州香薷生长及体内铜吸收和积累的影响。

Total percent of carbon, nitrogen and phosphorus in Engraulis japonicus varied from 46.3% to 60.5%. And carbon content of Engraulis Japonicus was increasing and phosphorus was decreasing when growing from larvae to adult. However, there was not significant difference to nitrogen in different stages. Differences of nutrient contents in different life stages may be caused by changes in allocation of materials for growth within the body.

结果表明，碳、氮和磷三种元素占到鳀鱼体重的46.3-60.5％，其中碳元素含量与体长成正相关，磷元素与体长成负相关，氮元素与体长之间的联系并不非常明显，不同阶段的鳀鱼在元素组成上的差异直接反映了各阶段其需要不同物质。

The addition of yeast extract for nitrogen source can increase content of ergothioneine (824.8 mg/ml dw);Fermentation of Pleurotus eryngii was polished buckwheat as medium, moisture content at 45%, temperature at 30℃and cubation 17 days could get high content of ergothioneine (580.6 mg/kg dw), and biomass was 163.4 mg/g dw, yeast extract as nitrogen source (651.6 mg/kg dw), Fructose as carbon source (721.4 mg/kg dw).

在碳源方面，添加果醣能提高麦角硫因含量为721.4 mg/kg dw。

Under 50%, 60% and 70% field capacity, ammonium nitrogen content in soil with water soluble felted and coated fertilizer was in positive correlation to water content, and nitrate nitrogen content after 24 d was more than that with urea treatment.

在田间持水量50%、60%、70%条件下，微水溶性胶结包膜缓释肥料土壤铵态氮含量变化与水分呈正相关关系，24 d后硝态氮含量呈高于尿素处理趋势。

Aside, the heightener of ammonia-nitrogen removal follows ammonia-nitrogen original concentration.

另外，氨氮去除率随着初始氨氮浓度的增大有明显的提高。

The comparison of changes of nitrate concentration and hardness indicates that there is a relationship between the nitrogen pollution and the increasing of other compounds, but nitrogen compounds have their own characteristics on migration and transformation and accumulation in different hydrochemical environment.

NO(上标-下标 3)浓度与硬度变化趋势表明：氮污染与硬度等指标值升高有一定的联系，但在不同的水文地球化学环境中，在迁移和转化等方面又有着自已的特性。

The results showed that the contents of soil total nitrogen and hydrolyzable nitrogen can be reduced by irrigation.

由于对土壤肥力这一科学概念缺乏严格的定义和明确的量化指标，使人们对土壤肥力的认识长期停留在感性认识阶段，因此，常用N、P、K和有机质等养分含量的多少来衡量土壤肥力的高低[10 ，14 ] 。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。