中柱

For example, if an open test tube with some water in the bottom is placed in a room in which the air is relatively dry, water vapor will diffuse out through the column of air in the test tube.

例如，当一支底部有水的开口试管被放置在一间空气相对干燥的房间里，水蒸气就会通过试管中的空气柱散布出来。

Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.

虽然在地球表面每英亩空气柱中有34，500吨气态氮，但是如果这些气态氮不被固氮菌和藻类固定，是不能被植物利用的。

We investigated constituent of triterpenoid saponins ofAlbizzia, two new compounds together with two known compounds were isolated from Albizzia julibrissin Durazz. by using column chromatography (macroreticular resin, silica gel, Sephadex gel, reverse phase silica gel),preparative HPLC methods et al.On the basis of spectroscopic analysis, including IR,ESI-MS,~1H-NMR,~(13)C-NMR,HMBC,HMQC,~1H-~1HCOSY and chemical methods, the structure of two new compounds were identified as 3 - O -[β-D-xylopyranosyl(1→2)-β-D-fucopyranosyl (1→6)-β- D -2- deoxy - 2 - acetoamidoglucopyranosyl] -21-O-[(6S)-2- trans- 2,6-dimethyl - 6 - O-β- D - quinovopyranosyl -2,7- octadienoyl] - acacic acid- 28 - O-β-D-glucopyranosyl(1→3)[α-L-arabinofuranosyl(1→4)]-α-L-rhamnopyranosyl(1→2)-β-D-glucopyranoside acacic acid 3- O -β- D- glucopyranosy(1→3)-β- D- fucopyranosl(1→6) [β-D- xylopyranosyl (1→2)]-β-D-glucopyranoside ;two known compounds were acacic acid lactone 3- O -β-D- xylopyranosyl-(1→2)-β-D-fucopyranosl (1→6)- 2-deoxy -2 -acetoamido -β-D- glucopyranoside ; acacic acid lactone 3- O-β-D-xylopyranosyl(1→2)-α-L- arabinopyranosl (1→6)- 2- deoxy - 2- acetoamido -β-D-glucopyranoside . The study lays chemical foundation and chemical reference substance for enhancing quality standard of Albizzia julibrissin Durazz.

本研究论文在综述国内外对合欢属Albizzia三萜皂苷化学成分和药理作用研究进展的基础上，利用传统植化分离手段和现代分离技术，包括大孔树脂、硅胶、葡聚糖凝胶、反相硅胶等柱色谱，制备高效液相色谱法等技术从中药合欢皮中分离得到了4个化合物，其中，2个新化合物和2个己知化合物，并进一步通过现代分析技术IR，ESI-MS，~1H-NMR，~(13C-NMR，HMBC，HMQC，~1H-~1HCOSY等和化学方法鉴定了2个新化合物的结构分别是：3-O-[β-D-吡喃木糖基(1→2)-β-D-吡喃夫糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖基]-21-O-[(6S)-2-反式-2，6-二甲基-6-O-β-D-吡喃鸡纳糖基-2，7-辛二烯酸基]-金合欢酸-28-O-α-L-呋喃阿拉伯糖基(1→4)[β-D-吡喃葡萄糖基(1→3)]-α-L-吡喃鼠李糖基(1→2)-β-D-吡喃葡萄糖苷，金合欢酸3-O-β-D-吡喃葡萄糖基(1→3)-β-D-吡喃夫糖基(1→6)[β-D-吡喃木糖基(1→2)]-β-D-吡喃葡萄糖苷；2个已知化合物结构分别是：金和欢酸内酯3-O-β-D-吡喃木糖基(1→2)-β-D-吡喃夫糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖苷，金和欢酸内酯3-O-β-D-吡喃木糖基(1→2)-α-L-吡喃阿拉伯糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖苷。

An aliquot of the reaction mixture was injected into a C18-column with a mobile phase consisting of 0.05 molL^(-1) phosphate buffer (pH 5.5)-methanol (65:35, V/V) and detected at 235 nm.

土壤样品用0.6 molL^(-1) KOH提取，经对甲基苯磺酰氯衍生化后，注入C18柱中分离，用紫外检测器在235 nm波长检测，流动相组成为0.05 molL^(-1)磷酸盐缓冲液(pH 5.5)：甲醇＝65：35。

Methods: from prepation of crude drug as start, study the technology of extract and defat with L9 (3~4) orthogonal test. With EtOH extraction and water sed, alkali washing, EtOAC extraction as main methods of eliminate dopant. Finally with alky AlzO3 chromatographic column, rich and gain anticancer active site. The maximum response was achieved at a 40 min extracting time with 10 times volume 90% EtOH added to the sample for the first time and 30 min for the second time. Adding 10 times water will produce precipitation; Place the precipitation into 6 times petroleum benzin to de-fat at 60℃.

云南红豆杉中抗癌活性物制备工艺研究方法：利用正交设计试验L9(3~4)确定原料药提取工艺为：10倍量90％乙醇提取两次，第一次40分钟，第二次30分钟；醇提液用10倍量水沉；沉淀加6倍量石油醚40℃脱脂；用1mol／L的NaOH溶液碱洗，除去酸性杂质；以碱性氧化铝柱，以环己烷／丙酮为洗脱溶剂，在环己烷-丙酮(6：4)段富集到所需活性部位，洗脱剂用量为3VB。

There are totally three kind of neurons in the optic lobes: amacrine neurons, columnar neurons and tangential neurons, part of which are GABA immunoreactive and only several tangential neurons are 5-HT immunoreactive.

整个视叶共包含三种类型的神经元：无长突神经元、柱状神经元和切向神经元，它们中均有部分被GABA标记，而只有少数的切向神经元被5-HT标记。

Melamine is eluted from the SPE cartridge with 5% ammonium hydroxide / methanol, evaporated to dryness, reconstituted with internal standard and 50% acetonitrile / water, and analyzed by LC/MS/MS.

三聚氰胺使用5%的氢氧化铵/甲醇从SPE柱中洗脱，蒸发至干燥，用内标物与50%的乙腈/水重新配置成原来的浓度，通过LC/MS/MS分析。

In spatial analytic geometry,a spatial curve is an intersecting line of two curved surfaces.

在空间解析几何中，空间曲线是两曲面的交线，在空间曲线中消去一元，即得投影柱面。

Depending on the characteristics of the low grade oxidized ore on the surface in Woxi,and by small scaled column leaching tests and commercially scaled heap leaching tests,a flowsheet of heap leaching-carbon adsorption-disadsorption and electrowinning was applied,where masking agent was used to reduce the influence of Arsenic and antimonial on cyanidation.

根据沃溪区低品位地表氧化矿矿石的性质特点，通过小型柱浸试验和堆浸工业试验，采用堆浸—活性炭吸附—解吸电解工艺处理该矿石，工艺中采用隐蔽剂以消除砷、锑矿物对氰化的影响，金回收指标较好，经济效益可观。

This article mainly established the analysis method to extract the oxine-copper residues in cucumber and soil with ion pair of antiphase HPLC and Ultrasonic-assisted solvent. This method mainly uses XBridge C18 column and UV detector by using waters phase of phosphatic buffered solution/acetonitrile (60:40, by vol) as mobile phase with 0.8 mL/min flow ratio and UV detection at 250 nm. The residue time was 4.71 minute. Accuracy, precision, and sensitivity of the method all satisfy the demands of pesticide residue analysis.

建立了黄瓜和土壤中喹啉铜的超声波辅助溶剂提取－反相离子对高效液相色谱法的残留分析方法，该方法使用XBridge C18色谱柱和可变波长紫外检测器，并以水相磷酸盐缓冲溶液－乙腈（体积比为60：40）作流动相；流速为0.8 mL/min；检测波长为250 nm；保留时间为4.71 min；该方法的准确度、精密度及灵敏度均满足农药残留分析的要求。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。