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Gabriel reaction was adopted to synthesis 2-(0ctahydro-1-azocinyl)ethylamine, N-(β-Heptamethyleniminoethy1)phthalimide was prepared by treating Heptamethylenimine with N -(β-bromoethy1) phthalimide. N -(β-bromoethy1) phthalimide was easily prepared from phthalic anhydride in two steps.
我们采用Gabriel伯胺合成法制备2-环庚亚胺基乙胺,从邻苯二甲酸酐经过两步反应很容易地得到N-邻苯二甲酰亚胺,然后与环庚亚胺发生亲核取代反应,产物再水解制得伯胺2-环庚亚胺基乙胺。
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Based on the technique from micrometer particle dispersion, superfine particle dispersion behavior and its effect on polymere.
结合微米分散技术基础,对超微颗粒在聚合物固体中分散及其结晶研究的进展深入探讨,揭示了聚合物基-纳米复合材料的颗粒分散经过纳米前驱物中间阶段,再进行聚合复合与熔体复合,得到颗粒均匀的分散体系。
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Two pairs of primers (TS5/TS11 and S18/S19) were used for the PCR method. Positive PCR results were obtained after the 18-hour preculture (6 h in lactose broth at 37℃ followed by 12 h in Rappaport-Vassiliadis broth at 42℃) for spiked raw and irradiated meats with or without freezing treatment.
试验以经过或未经过冷冻处理之加菌的鸡绞肉及辐射鸡绞肉,采用乳糖培养液於37℃培养6 h,续以Rappaport-Vassiliadis 培养液於42℃培养12 h之预培养,再配合PCR法,均可检测出沙门氏杆菌。
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From the starting material: propargyl alcohol, the building block was prepared easily by Jones oxidation, esterfication, bromination and selective trifluoromethylation.
第一部分:从丙炔醇出发,经过Jones氧化,甲酯化,顺式二溴化,再选择性地在酯基的β位实现三氟甲基化,合成了目标含氟砌块。
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The method comprises heating up the lactic acid solution to gasify at 150-200 degree C, mixing the obtained mixed vapour of lactic acid and water with the carrier gas, entering into gas-solid catalytic reactor to get the reaction product gas by the action of a modified Y zeolite molecular sieve catalytic agent and dewatering after heating up the mixed gas to 200-450 degree C, obtaining the propenoic acid solution through gas-liquid dissociation after cooling the reaction product gas, obtaining coarse propenoic acid products form the propenoic acid solution by gas stripping, azeotropic distillation, extraction and rectification in turns.
其特征在于将乳酸水溶液加热至150~200℃气化得到的乳酸-水混合蒸气与载气混合,将混合后的气体继续加热到200~450℃后进入气-固相催化反应器中经改性Y沸石分子筛催化剂作用脱水得反应产物气体,反应产物气体冷却后经气液分离得到丙烯酸溶液,丙烯酸溶液再依次经过气提、共沸蒸馏或萃取、精馏得到粗丙烯酸产品。
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Medical packaging of surface treatment are usually UV glazing, covered with film, polished like spectroscopy》, covered with film, polished, and so a high temperature dehydrolyzing paper, water content significantly decrease, then stop bit protrudent, part of the paper fiber brittle occur.
药品包装的表面处理通常采用UV上光、覆膜、磨光等工艺,其中,上光、覆膜、磨光等使纸张经过高温脱水,含水量明显降低,再通过位伸,部分纸张纤维脆会发生形变。
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Primary culture of goat mammary gland cells could be derived by outgrowth of migrating cells from fragment of tissue. Fibroblast and epithelial cells could be pured according to their different sensibility to trypsin. Complex cultures treated by 0.25% trypsin in Hanks' for 5~7min at 37℃, the dispersed cells were mainly fibroblasts,then the rest treated by 0.15% trypsin-0.02% EDTA in Hanks'for 5~8min at 37℃, the majority cells harvested were mammary epithelial cells.
用组织块培养法可获得良好的山羊乳腺细胞原代培养物;培养的山羊乳腺成纤维细胞比上皮细胞对胰蛋白酶更敏感,据此可在传代过程中将二者分离纯化,获得纯细胞系;混合培养物先用0.25%胰蛋白酶在37℃消化5~7min 所收集的细胞主要为成纤维细胞;再加0.15%胰蛋白酶-0.02鞹A 消化液在37℃继续消化5~6min 所回收的细胞绝大多数为上皮细胞,经过2~3 代,即可得到纯化的乳腺上皮细胞系。
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Primary culture of goat mammary gland cells could be derived by outgrowth of migrating cells from fragment of tissue. Fibroblast and epithelial cells could be pured according to their different sensibility to trypsin. Complex cultures treated by 0.25% trypsin in Hanks' for 5~7min at 37℃, the dispersed cells were mainly fibroblasts,then the rest treated by 0.15% trypsin-0.02% EDTA in Hanks'for 5~8min at 37℃, the majority cells harvested were mammary epithelial cells.
用组织块培养法可获得良好的山羊乳腺细胞原代培养物;培养的山羊乳腺成纤维细胞比上皮细胞对胰蛋白酶更敏感,据此可在传代过程中将二者分离纯化,获得纯细胞系;混合培养物先用0.25%胰蛋白酶在37℃消化5~7min 所收集的细胞主要为成纤维细胞;再加0.15%胰蛋白酶-0.02%EDTA 消化液在37℃继续消化5~6min 所回收的细胞绝大多数为上皮细胞,经过2~3 代,即可得到纯化的乳腺上皮细胞系。
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Through transposition and transmission of reachability ,it is used to eliminate unknown relations using of reachability and reachless relations from initial matrix and using of interactive method.
这种方法从初始可达阵开始,利用可达关系的传递性,经过一系列的变换,消除一部分未知关系,再利用不可达关系,进一步消除一部分未知关系,最后采用人机交互的办法消除剩余的未知关系,从而得到利用可达矩阵表示的系统结构模型。
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The traditional ideas of designing data compression which is mainly based upon reducing the redundance of information exert to coding and designing.
传统的设计思路主要基于减少信息中的冗余着力于编码设计,其压缩比一直在百分之几十左右徘徊,经过传统编码压缩的信息,很难再经类似的方法进一步压缩。
- 推荐网络例句
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Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".
歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。
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This is Kate, and that's Erin.
这是凯特,那个是爱朗。
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Articulate the aims, objectives and key aspects of a strategic business plan.
明确的宗旨,目标和重点战略业务计划。