硝酸

The effects of different concentrations of Pb2+(0, 5,10,15, 20, 50, 80 mg/ L) Pistia stratiotes, activities of protective enzyme SOD, NRA ,CAT, POD in roots and epicotyls of maize seedlings were studied.

中文摘要：研究了不同浓度( 0，5，10，15，20，50，80mg/L)Pb2+胁迫对大薸超氧化物歧化酶、硝酸还原酶、过氧化物酶、过氧化氢酶等保护酶活性的影响。

The results show that with Cd2 + Stress Pistia stratiote large increase of the concentration of leaf tissue of the chlorophyll content decreased, while the MDA, soluble protein content, proline content, lipid membrane permeability, SOD, POD, CAT, nitrate reduction The first enzyme content was increased at different times and reached a peak after the downward trend.

结果显示，随着镉胁迫浓度的增加大薸叶组织内的叶绿素含量呈下降的趋势，而丙二醛、可溶性蛋白含量、脯氨酸含量、脂膜相对透性、超氧化物歧化酶、过氧化物酶、过氧化氢酶、硝酸还原酶的含量呈先升高并在不同的浓度达到高峰后再下降的趋势。

After introduction of reaction mechanism of LHE water stabilizer containing polyhydroxy carboxylate in CW system and applications in other chemical plants,the author analyzes the feasibility introducing this kind of stabilizer into CW system in nitric acid plant of Sichuan Chemical Co.

介绍LHE聚合羟基羧酸盐水质稳定剂的作用机理以及在其他化工厂循环水系统中的应用实例，设想将LHE聚合羟基羧酸盐水质稳定剂用于我公司硝酸厂循环水系统，将表冷液治理后低浓度氨氮淡水作为循环水系统的补充水，达到氨氮零排放。

The method to determine the primary amino content in the polymethylene polyphenyl polyamine through the quantitative diazo reaction of primary amino and nitrous acid was researched.

研究了利用伯胺基与亚硝酸定量发生重氮化反应测定多苯基多次甲基多胺中伯胺基含量的方法，确定了最佳测定工艺条件，其分析结果的最大相对误差及相对平均偏差在0。

MethodsIn the solvent of 1 mol/L NaOH, using the reaction of the water-soluble phenolic acidity in Radix Salviae Miltiorrhizae and the NaNO_2-Al(NO_3)_3, the total components of water-soluble phenolic acidity in Radix Salviae Miltiorrhizae injections and drip solution(calculated with protocatechualdehyde) were determined by colorimetric s...

方法利用丹参中水溶性酚酸类成分与亚硝酸钠和硝酸铝溶液在碱性条件下的显色反应，比色法测定该两种制剂中水溶性酚酸的总量。结果原儿茶醛在3.336~14.46mg/L范围内呈良好的线性关系，回归方程为：A=0.02777C+0.01279(r=0.9996)，加样平均回收率为100.8%，RSD为0.96%。结论该法简便快速，结果准确，重现性好，可用于该制剂的质量控制。

Adjacent helical chains are racemic. The Ag atom is linked to two nitrogen atoms of the 2-pyridyl and 4'-pyridyl groups from two different 2,4'-bpy ligands as well as to the oxygen atom of the counterion. In 17 and 19, the adjacent helical chains are linked to wavy two-dimensional network structures by the nitrate counterions.

相邻的螺旋链间是外消旋的，Ag 原子与分别来自两个不同2，4'-联吡啶的2-吡啶基和4'-吡啶基的氮原子以及阴离子的氧原子配位，在配合物17和19中，相邻聚合螺旋链被硝酸根离子桥连接起来，变成了一个波浪形的二维网络结构；配合物18是首次通过无桥连配体支持的Ag ××× Ag键将相邻螺旋链连接成二维非穿插的网络结构。

Effects of KNO3 spray on nitrate reductase activity and nitrogen accumulation were studied in Pyrus pyrifolia cv.

在盆栽条件下，研究了喷施KNO3对新高梨实生苗硝酸还原酶活性和氮素积累的影响。

AMs that collected, pured and cultured with contine method were stimulated by LPS of different concentration(0μg/ml,0.01μg/ml,0.1μg/ml,1μg/ml,10μg/ml) for 60min or by 1μg/ml LPS for different time stage (0min,5min,15min,30min,60min,120min) to observe the dynamic change of NF-кB intranuclear level and NO production, from which the best concentration and time point of LPS stimulation were selected. In the study, all AMs were divided into 4 groups: control group, group stimulated with LPS, group interrupted by Cal C and group inhibited by PDTC. The following parameters were measured: NF-кB level in nuclear protein extraction of AMs detected with sandwich ELISA, Inter-nuclear transposition of NF-кB observed with immunocytochemistry staining, NO content in cell culture medium quantitied with nitric acid reductase assay, Morphologic change of AMs in apoptosis observed with acridine orange staining and fragmentation at genome DNA of AMs detected with apoptotic electrophoresis assay.

分离、纯化及培养大鼠肺巨噬细胞；以不同浓度的LPS(0μg/ml，0.01μg/ml，0.1μg/ml，1μg/ml，10μg/ml)和不同作用时间(0min，5min，15min，30min，60min，120min)分别刺激小室培养的细胞单层，观察NF-κB的核内浓度及NO合成量的动态变化，选择LPS的最佳用量和作用时间；然后分成四组实验，设正常对照组，LPS处理组，特异性PKC抑制剂阻断组，NF-κB抑制剂阻断组；收集培养的单层细胞及培养液；采用夹心ELISA法定量测定细胞核提取物中的NF-κB水平；免疫组化法检测NF-κB的核内移位变化；硝酸还原酶法测定细胞培养液中NO含量；吖啶橙染色观察凋亡细胞的形态学变化，凋亡电泳实验检测细胞凋亡后基因组DNA的断裂情况。

The activities of nitrate reductase, glutamate dehydrogenase and glutamine synthetase in water spanich leaves were enhanced, the contents of total nitrogen and protein increased, but the content of free amino acid decreased. Compared to the control, low and medium amount of quinhydrone made significant difference respectively, but high amount had not notable effects.

醌氢醌使蕹菜叶片硝酸还原酶活性、谷氨酸脱氢酶活性、谷酰胺合成酶活性、总氮含量、蛋白质含量提高，游离氨基酸含量降低；与对照相比，低、中量醌氢醌处理差异显著，高量醌氢醌差异不显著。

The energy of the complex molecule has been compensated by a hydrogen bond formed by, a proton bonding to a quinolyl nitrogen atom and a nitrate ion.

分子中有一个氢离子与另一个喹啉N原子结合并与硝酸根的氧原子形成氢键，从而使配合物分子在能量上得到补偿。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。