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Second,the sterically demanding substituted magnesium alcoholates can be prepared from dialkylmagnesiums R_2Mg and alcohol.The main disadvantage of this synthesis route lies in the fact that relative expensive dialkyl magnesium compounds,such as Et_2Mg for example,have to be used as starting materials.For this problem,a convenient preparation route of pure dialkylmagnesium from a Grignard reagent.

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The studies was proceeded on the the supercritical CO2 extraction technique of rotenone from Tephrosia vogelii. The extraction influences of technology conditions were systematically groped, The research results were listed as follows:1 The analysis method applied in this paper has been proved to be suitable to technology research of the studies on the SC-CO: extraction technique of rotenone from Tephrosia vogelii. 3 indexes, extraction ratio of rotenone. extraction ratio of total compounds and rotenone content percent in total compounds weight, were carried out with HPLC quantitatively determination combined with the sample weight loss after extraction. With these 3 indexes. The extraction influences of technology conditions were evaluated by synthesis. Then the best technology conditions were ascertained for different extraction aims.2 The pretreatment of rough material should be needed before extraction. Comminuting the material to 0.28mm size is most fit to SC-CO: extraction.3 Firstly static extracting 20 min then turn to dynamic doing is the better extraction mode than other ones.4 The orthogonal experiment was conduct with 3 factors and 5 levers.

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When the teeth ratio of planetary gear is greater than 2 and transmission ratio is less than 1,the transmission will be speeded up from right to left.When the teeth ratio is less than 2,transmission will be slowed down from right to left,and when the teeth ratio is becoming close to 1,transmission ratio will trend towards infinity theorically.

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The result of GPR investigation in west Jilin shows that the radar waveform of saline-alkali soil is different from that of tillable soil, and this can be used to distinguish tillable soil from saline-alkali soil. The extent of salinization can be determined according to the relativity of spectra.

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The determination of IL-6 level of serum and urine may be used as one of the important indexes for differential diagnosis of acute rejection from CsA toxicosis and ATN.The determination of IL-6 level of serum and urine may also be useful for differential diagnosis of acute rejection from infection.

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It can be seen that mercury contents in sulfides of the density fractions are different from each other in the same coal, which implied that mercury is distributed in sulfide unhomogeneously. The reasons of the unhomogeneity of mercury distribution in sulfide may be that mercury exist in sulfide in form of submicrometer size individual mineral such as cinnabar, and not in form of solid solution in pyrite, or that in coal, there are multi-stage and multi-origin sulfides among which the distribution and modes of mercury are different from each other.

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Any organic acids couldn't be detected from the untransformed Scout66. After aluminium stress, malate and citrate could be detected from the transformed Scout66 and the highest amounts were 0.162μmolg-1 root fresh wt 24h~(-1) and 0.312μmolg-1 root fresh wt 24h~(-1) respectively.

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To have the level of fourth-generation technology, thanks to good fortune by the German-made automatic winding machine AC338 for example, with the third-generation type of comparison, the practical winding speed of nearly 30 percent, most can be as high as 2 000 m / min;筒紗quality increased yarn Uster CV value of the two machines are basically the same though, but the quality of yarn, such as details of 1000 meters from 14.5 to 12, 17.24 percent lower; km thick section from 134.3 to 121.7 , 9.38% lower; Neps kilometers from 121.6 to 115.5, lower 5%; 3 mm in length Hairiness (months / 10m) from 135 down to 102, reduced 24.4%; 14.36% increase in production; production efficiency 8.5%, not筒紗the use of high-quality, the following procedures brought about by economic interests.

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There were soluble trophic molecules with relative molecular weight larger than 30 000 for survival and neurite growth of FMN cultures in media with SC-CMCs derived from facial and sciatic nerves of neonatal rats and with SC-CMCs derived from Wallerian degenerating facial and sciatic nerves of adult rats. It might be reasonable to choose SC from sciatic nerves of rats on account of the findings from SC cultures on facial motoneurons.

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