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the formation of
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  形成
     The Formation of Sino-American Antagonistic Relation (1949-1953)
     中美敌对关系的形成(1949-1953)
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     Cluster Line Criterion and the Formation of Cu-Zr(Hf)-based Ternary Bulk Metallic Glasses
     团簇线判据及Cu-Zr(Hf)基三元块体非晶合金形成
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     Study on the Formation of Carbonaceous Mesophase Structures and the Applications of Thereof Carbon Materials
     碳质中间相结构的形成及其相关材料的应用研究
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     Study on the Formation of Quality Traits and Microbial Roles of Yunnan Dry Cured Ham
     云南干腌火腿品质特征形成与微生物作用研究
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     The Role of ABCA1 and COX-2 in the Formation of Carotid Atherosclerotic Plaques
     ABCA1及COX-2与颈动脉粥样硬化斑块形成的机制研究
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  “the formation of”译为未确定词的双语例句
     Townspeople Literature before the Formation of Modern Metropolises
     现代都市未成型时期的市民文学
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     A Clinical Study of Reversed Effect on the Formation of Ventricular Aneurysm by PCI and the Level Change of Myocardial Necrotic Inflammatory Markers in Patients with Acute Myocardial Infarction
     PCI对急性心肌梗死室壁瘤的逆转效应及其心肌坏死炎症标记物水平变化的临床研究
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     The Role of ABCG5 and ABCG8 in Liver Cholesterol Transport and the Formation of Cholesterol Gall Stone
     ABCG5和ABCG8在胆囊胆固醇转运和胆囊胆固醇性结石形成中的作用
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     Study on the Role of P311 in the Formation of Hypertrophic Scar
     烧伤后增生性瘢痕相关基因P311功能的初步研究
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     A Study of the Formation of Natural Gas Pools in Songliao Basin with a Quantitative Appraisal of Exploration Targets for Deep Natural Gas
     松辽盆地天然气成藏规律及深层天然气勘探目标定量评价研究
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  相似匹配句对
     formation;
     评价的形成性问题;
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     FORMATION OF WEEDS
     杂草的形成
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     The Formation of Styles
     浅谈艺术风格的形成
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     So the formation of X(?)
     因此X(?)
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     Formation of Belief
     信念的形成
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  the formation of
These corresponding chalcones were reacted with phenyl hydrazide in glacial acetic acid, which led to the formation of novel 4-[5-(substituted phenyl)-1-phenyl-4,5-dihydro-1H-3-pyrazolyl]-2-methylphenol derivatives.
      
However, high (denaturing) concentrations of Me2SnCl2 (more than 9 mM) caused considerable destabilization of DNA associated with the formation of a partially unfolded intermediate at 13.6 mM of Me2SnCl2.
      
Cyclocondensation reaction of 7 with anhydrous hydrazine led to the formation of 7-aminopyrazolo[3,4-d]pyridazine 8 derivative.
      
It is proved that the right spread order is closed under the formation of parallel systems with independent and identical components.
      
It demonstrated that all of these curcumin derivatives inhibited the formation of advanced glycation end products (AGE).
      
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This communication reports the results of a study of the gravimetric deter- mination of lead as normal phosphate, known as Vortmann and Bader method, which has been recently examined by Hubicki and Rys. According to our findings, tartaric acid should be added only when antimony is present. With the addition of tarearic acid unusual large excess of precipitant as suggested by Vortinann and Bader is required for complete precipitation. The suitable pH range for the precipitation of tertiary lead phosphate is 6.5...

This communication reports the results of a study of the gravimetric deter- mination of lead as normal phosphate, known as Vortmann and Bader method, which has been recently examined by Hubicki and Rys. According to our findings, tartaric acid should be added only when antimony is present. With the addition of tarearic acid unusual large excess of precipitant as suggested by Vortinann and Bader is required for complete precipitation. The suitable pH range for the precipitation of tertiary lead phosphate is 6.5 to 10. Below pH 6.5, the precipitation will be incomplete, owing apparently to the formation of acid phosphate(s). Beyond pH 10, no experiment has been made, because no advantage is gained by working in such alkaline media. The concentration of the precipitant in sdlution after reaction should be within 0.00085-0.0033 molar in order to obtain good results. The precipitates may be ignited at any temperature from 650℃ up to at least 900℃. The practice of drying the pre- cipitates at 130℃ to constant weight suggested by Hubicki and Rys should be discarded, since the precipitates still contain noticeable amounts of water after drying to constant weight at that temperature. It is preferred to use the method of precipitation from homogeneous solution. With this technique in practice dense, crystalline and easily filterable precipitates are obtained; and small quantity of lead, as low as 5 mg, may be determined satisfactorily. The effect of presence of some alkali and ammonium salts has also-been studied.

本文報告用磷酸根測定鉛重量法的各種適宜條件。溶液的pH值應在6.5至10之間。過剩沉澱劑在溶液中的濃度應為0.00085——0.0033M。沉澱應在650℃-900℃間灼燒之;如在130℃乾燥,則沉澱內的水份不能完全驅盡。均勻沉澱可改善沉澱的性質,並可测定少至5毫克的鉛。如溶液中無銻,則不必加酒石酸。

Three adult human brain stems which presented an unilateral hyprtrophy ofthe striae medullares of the fourth ventricle were studied in serial Weigert sec-tions with the following results. The unilateral hypertrophy of the striae medullares is correlated with thehypertiophy of the contralateral nucleus arcuatus. In the hypertrophied nucleus arcuatus the fibers collect themselves towardsthe bottom of the ventral median fissure. The large bundle thus formed coursesdorsally along the raphe, crosses to the other...

Three adult human brain stems which presented an unilateral hyprtrophy ofthe striae medullares of the fourth ventricle were studied in serial Weigert sec-tions with the following results. The unilateral hypertrophy of the striae medullares is correlated with thehypertiophy of the contralateral nucleus arcuatus. In the hypertrophied nucleus arcuatus the fibers collect themselves towardsthe bottom of the ventral median fissure. The large bundle thus formed coursesdorsally along the raphe, crosses to the other side ed emerges on the floor ofthe fourth ventricle. It then turns laterally in the subependymal layer, windingaround the tuberculum acusticum to approach the cerebellum. Besides the main nucleus arcuatus, the fibers of the accessory nuclei on themedioventral surface of the pyramid and of the ventral part of the nucleusraphes also paticipate apparently in the formation of the striae. The scatteredgray patches on the lateral part of the ventricular floor are minor relay stationsof the striae medullares. The nucleus arcuatus and allied nuclear masses are the caudally displacedpontine nuclei. The striae medullares behave just like an aberrent bundle ofthe brachium pontis and, as such, they conduct towards the cerebellum. Besides the striae medullares, the fibers of the nucleus arcuatus are also in-corporated into the ventral external arcuate fibers on the same and oppositesides, which curve around the ventrolateral surface of the medulla oblongatatowards the cerebellum.

在三个成人脑干先见第四脑室髓纹一侧偏大,经过染片研究,发现以下的情形。一侧偏大的髓纹与对侧弓状核的偏大是相繋的。在偏大的弓状核中,纤维聚向正中裂底,大束纤维循缝际行向背侧,陆续越边,自室底中線折向外侧,遶过听结节,接近小脑。除了弓状主核,前外侧的副核、缝际核前部似也参加髓纹的合成。室底外侧部的零散核团也收发髓纹纤维。弓状核和连属的核团是脑桥核的下延部分。髓纹相当向下移位的脑桥臂纤维,是傅向小脑的。弓状核的纤维除形成髓纹外,一部进入同边和对边的前外弓状纤维,遶行延髓前外面,似趋奔小脑。

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl....

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与三价铁起作用者,均应分离之。

 
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