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dextrorotatory
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  右旋的
     As the whole process is carried out below 50 ℃ instead of higher temperature,the intermediate tartaric acid and the product ammonium tartrate can avoid changing from dextrorotatory to levorotatory. Specific rotatory power of ammonium tartrate made by this method ( 20 D= +38 5 ) is higher than that ammoniated with commercial tartaric acid ( 20 D=+34 4).
     由于整个制取过程采用 5 0℃以下较低温度处理 ,可避免右旋的中间体酒石酸和产品酒石酸铵由于受高温处理而发生的消旋化现象 ,所得到的酒石酸铵右旋比旋光度 [α]2 0D =+38 5 ,高于用工业酒石酸直接铵化所得到的酒石酸铵比旋光度 [α]2 0D =+34 4。
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  “dextrorotatory”译为未确定词的双语例句
     Levorotatory and dextrorotatory enantiomers of cetirizine and other nine compounds were synthesized and were identified by MS, IR, 1H-NMR and elemental analysis .
     通过化学拆分得到单一手性的4-氯-α-苯基苯甲胺,然后由它出发合成出左西替立嗪和其它九个化合物的单一对映体,并经元素分析、红外、质谱、核磁等鉴定。
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     The effect of Jones matrix on the performance of gyros is analyzed , including differential loss、 eigenpolarizations and frequency of levorotatory and dextrorotatory gyros, the measure of avoiding differential loss is put forward.
     分析了Jones矩阵对于陀螺性能的影响,包括对陀螺差分损耗、自恰模式偏振态、左右旋陀螺频差的影响,并提出消除差分损耗的措施。
短句来源
     Increase in absolute value of specific rotation was observed for the polymer of (S)-MOPMAM. Interestingly, the formed polymer was dextrorotatory, which is opposite to that of monomer.
     三种聚合物易溶于常见的有机溶剂,并表现出相当大的旋光活性,其中,(S)-MOPMAM聚合产物的旋光度为+102.0°~+117.1°,聚合物的旋光方向与其单体的旋光方向相反。
短句来源
     Stomchic can increase the absorption rate of the dextrorotatory xylose (P<0. 01) and stimulate the rabbite intestine in vitro test, and depress the action of acetylcholine and a-tropine.
     开胃助长精提取液可增强D一木糖吸收率(P<0.01),能兴奋离体家兔肠管,并有双向调节作用,对乙酰胆碱和阿托品呈现拮抗作用; 可使巨噬细胞的吞噬功能加强;
短句来源
     (4) The stress field of Neozoic tectogenesis stands in the dextrorotatory slippery tensile situation in the east of Eurasia. The geodynamical factors include plate movement and the motion of matter in mantle;
     (4)欧亚大陆东部新生代区域构造运动总体处于右旋走滑拉张环境 ,其动力因素包括板块运动和地幔物质运动 ;
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     Increase in absolute value of specific rotation was observed for the polymer of (S)-MOPMAM. Interestingly, the formed polymer was dextrorotatory, which is opposite to that of monomer.
     三种聚合物易溶于常见的有机溶剂,并表现出相当大的旋光活性,其中,(S)-MOPMAM聚合产物的旋光度为+102.0°~+117.1°,聚合物的旋光方向与其单体的旋光方向相反。
短句来源
     Levorotatory and dextrorotatory enantiomers of cetirizine and other nine compounds were synthesized and were identified by MS, IR, 1H-NMR and elemental analysis .
     通过化学拆分得到单一手性的4-氯-α-苯基苯甲胺,然后由它出发合成出左西替立嗪和其它九个化合物的单一对映体,并经元素分析、红外、质谱、核磁等鉴定。
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  dextrorotatory
The effects were not produced by SKF 38393, a selective D1 agonist, or by the dextrorotatory enantiomer of quinpirole, which lacks D2 agonist activity.
      
The dextrorotatory isomer had no effect on any of these substances alone and did not alter the effects of the levorotatory isomer.
      
The levorotatory isomer, LY156258, increased striatal acetlycholine concentration at doses of 0.1-1 mg/kg i.p., whereas the dextrorotatory isomer had no effect even at doses as high as 30 mg/kg.
      
Acylation of meso-2,3-dimethylbutane-1,4-diol with vinyl acetate in the presence of porcine pancreatic lipase (PPL) leads to the dextrorotatory monoacetate of the above diol with enatiomeric excess (ee) 58-64%.
      
Starting with vinyltriethoxysilane, we were the first to obtain optically active dextrorotatory and levorotatory isomers of an unsaturated silicohydrocarbon, namely, of vinylphenyl-α-naphthylsilane.
      
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Some sulfur containing steroids derived from cholesterol were synthesized for the study of their protective effect against ionizing radiation on mammals. On refluxing cholesteryl bromide with ethanolamine followed by suitable treatment three isomeric products were isolated in the form of 3 B-(2'-hydroxyethylamino)-△~5-cholestene (I_a), 3a-(2'-hydroxyethylamino)-△~5-cholestene hydrochloride (Ⅱ_b), and 6-(2'-hydroxyethylamino)-3:5-cyclocholestane hydrochloride (Ⅲ_b)from the reaction mixture. However, when the...

Some sulfur containing steroids derived from cholesterol were synthesized for the study of their protective effect against ionizing radiation on mammals. On refluxing cholesteryl bromide with ethanolamine followed by suitable treatment three isomeric products were isolated in the form of 3 B-(2'-hydroxyethylamino)-△~5-cholestene (I_a), 3a-(2'-hydroxyethylamino)-△~5-cholestene hydrochloride (Ⅱ_b), and 6-(2'-hydroxyethylamino)-3:5-cyclocholestane hydrochloride (Ⅲ_b)from the reaction mixture. However, when the two were allowed to react at 200℃ in a bomb, only I_a and Ⅱ_b were obtainable. The i-structure is assigned to Ⅲ_b on the basis of its dextrorotatory power, negative bromine unsaturation test, and ready conversion to cholesteryl aniline on treatment with aniline. Both Ⅰ_a and Ⅱ_a when reacted with p-nitrobenzoyl chloride, were easily converted to the corresponding N, O-di-(p-nitrobenzoyl) derivatives, which showed maxima at 1730—1720 cm~(-1) and 1640 cm~(-1) in the infrared region, characteristic for the ester C=O and amide C=O groups respectively. Furthermore, neither Ⅰ_b nor Ⅱ_b gave cholesteryl aniline on treatment with aniline, so both Ⅰ and Ⅱ must be C_3-substituted 2'-hydroxyethylamino derivatives of △~5-cholestene, but differing in configuration. By the difference in the rotatory power,Ⅰ and Ⅱ are assigned as 3 B-and 3 α-orientations respectively, according to Bernstein's rule. Ia, when treated with thionyl chloride, gave 3 β-(2'-chloroethylamino)-△~5-cholestene hydrochloride (Ⅳ), which on reacting with thiourea, yielded 3 β-(2'-isothiuroniumethylamino)-△~5-cholestene chloride hydrochloride (Ⅴ). Ⅴ gave 3 β-(2'-mercaptoethylamino)△~5-cholestene hydrochloride (Ⅵ) on alkaline hydrolysis followed by acidification with hydrochloric acid. Ⅵ showed positive iodine-azide test and absorption band at 2510 cm~(-1) in the infrared region, both characteristic for sulfhydryl group. Thiocholesterol, on treatment with β-bromoethylamine in ethanolic sodium ethoxide solution, gave 3 β-(2'-aminoethylmercapto)-△~5-cholestene (Ⅶ), which was isolated in the form of nicotinic acid salt. Similarly, 3 β-(3'-pthalimidopropylmercapto)-△~5-cholestene (Ⅷ) was obtained by the reaction of thiocholesterol with γ-phthalimidopropylbromide in ethanolic sodium ethoxide solution. Thiocholesterol, when treated with 3, 4, 5-trimethoxybenzoyl chloride gave 3 β-(3', 4', 5'-trimethoxybenzoylmercapto)-△~5-cholestene (Ⅸ).

1.由3β-溴代-△~5-胆甾烯与β-氨基乙醇反应,分离得到三种产物:3β-(2′-羟乙基氨基)-△~5-胆甾烯;3α-(2′-羟乙基氨基)-△~5-胆甾烯与6-(2′-羟乙基氨基)-3:5-环胆甾烷。 2.3β-(2′-羟乙基氨基)-△~5-胆甾烯经亚硫酰氯作用后,与异硫脲反应可获得3β(2′-异硫脲代乙氨基)-△~5-胆甾烯。继续水解得3β-(2′-巯乙基氨基)-△~5-胆甾烯。它们可分别视为N取代的半胱胺或β-氨乙基异硫脲的衍生物。 3.由3β-巯基-△~5-胆甾烯与β-溴代乙胺作用,制得3β-(2′-氨乙基巯基)-△~5-胆甾烯。后者可视为S取代的半胱胺衍生物。3β-(3′-邻苯二甲酰亚胺丙基代巯基)-△~5-胆甾烯与3β-(3′,4′,5′-三甲氧基苯甲酰巯基)-△~5-胆甾烯也由类似方法合成。

Lianyungang Port, located on the middle part of west coast of Yellow Sea, is a important commercial port with the Liandao island as a natural defence. As a result of tae effort to enlarge the handling capacity, a plan has been drawing to construct a west sea wall, with a length of 6700m, linking the west end of Liandao island to the continent for protecting port area from the silting up and the wave. Dynamic analysis with Multi-temporal Aerial images shows that the sea course of the river mouth on the east side...

Lianyungang Port, located on the middle part of west coast of Yellow Sea, is a important commercial port with the Liandao island as a natural defence. As a result of tae effort to enlarge the handling capacity, a plan has been drawing to construct a west sea wall, with a length of 6700m, linking the west end of Liandao island to the continent for protecting port area from the silting up and the wave. Dynamic analysis with Multi-temporal Aerial images shows that the sea course of the river mouth on the east side of Lianyungang port is shifting to the west, so is the river mouth density current. They have revealed the exsistance of the coastal current, from the East to the West. The analysis of Landsat MSS images has indicated that the coastal current is trending from the river mouth of abandoned Yellow River to the Lianyungang area, bringing the mud and sand to the Lianyungang area. In Lianyungang area, there exists a dextrorotatory current field which gurrentee the passing through of mud and sand. The construction of the west sea wail would destroy the current field, block the mud--sand current, resulting in a large amount of mud-sand depositing in the port area and bringing harm to the port.

位于黄海西海岸中部的连云港是重要的万吨级商港。港池外有连岛作为海上屏障。为了扩大 吞吐能力,拟建造连按陆地与连云岛西端长达6700m的西海堤,以期防淤防浪。 多时相遥感图像动态分析显示,连云港东侧河口外航道不断西移,河口异重流也向西飘移, 表明该区存在着自东向西的沿岸流。美国陆地卫星MSS图像上沿岸流自废黄河口一带流向连云港 地区的特征也很清晰,并对侵蚀岸产生的大量泥沙携在连云港一带的特征也有明显显示。 连云港地区原来存在绕连岛右旋的流场。西海堤未建前,泥沙尚可顺利通过港池。西海堤的 建成,则破坏了现有流场,阻断泥沙流,将导致大量泥沙在港池内消能落淤,对港口造成危害。

CD (circular dichroisin ) spectra of neodymium yttrium aluminum borate (NYAB) crystal were measured over a wavelength range of 300 ̄800nm with a CARY model 61 CD spectropolarimeter at room temperature under constant nitrogen flush. The parameters of Cotton effects were given. Using the Kronig-Kramers formula in crystal and the approximation of a Gaussian CD band, the specific rotatory powers of NYAB crystal in the Z direction were evaluated from the parameters of its Cotton effects. It is concluded that this...

CD (circular dichroisin ) spectra of neodymium yttrium aluminum borate (NYAB) crystal were measured over a wavelength range of 300 ̄800nm with a CARY model 61 CD spectropolarimeter at room temperature under constant nitrogen flush. The parameters of Cotton effects were given. Using the Kronig-Kramers formula in crystal and the approximation of a Gaussian CD band, the specific rotatory powers of NYAB crystal in the Z direction were evaluated from the parameters of its Cotton effects. It is concluded that this can be a fruitful method if the half-width of the CD band is on the small side. In addition, CD measurement of an optically active crystal is helpful to judge whether it contains a mixture structure of dextrorotatory and levorotatory or not.

本文报道了NYAB[四硼酸铝钇钕,NdxY1-xAl3(Bo3)4]在室温下,300~800nm波长范围内晶体Z轴方向的CD谱(圆二色性谱)测定的结果,给出了相应的Cotton效应参数。将Kronig-Kramers变换公式应用于晶体,在高斯型CD带近似下,给出了晶体旋光度与Cotton效应参数的关系式。计算了NYAB晶体Z轴方向的旋光度,讨论了在CD带半宽度较小时用CD谱的测量估算晶体旋光度的优点,并指出Cotton效应值的比较对判断晶体有无混旋结构缺陷有参考价值

 
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