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The optimal conditions were found as follows: reaction temperature 90℃, reaction time 50 min, the molar ratio of catalyst to diethyl adipate 1.1:1, providing 99.5% yield.

结果表明,各试验因素的影响效能为反应温度(反应时间(催化剂用量;最佳合成条件为反应温度90℃,反应时间50 min,催化剂与原料的摩尔比为1.1:1,在此条件下,常压合成目标物的产率可以达到99.5%。

Using adipate as a starting material,a new curing agent,tetrahydroxyethyladipicdiamide was prepared by esterification and acylamide reaction with potassium hydroxide as a catalyst.

实验结果表明:在以氢氧化钾为催化剂,反应时间8h和反应温度80~90℃的优化条件下进行合成实验,产品的产率和羟值分别是96.7%和86.3 mg/g

On the other hand, the amidase activity and esterase activity of papain were determined at different temperatures.

一方面,通过比较常温溶液体系、低温溶液体系以及低温固液体系中的肽合成产率,发现低温和固液共存是动力学控制肽键合成的两个有利因素:另一方面,通过对木瓜蛋白酶催化水解动力学的研究,分别测定了该酶在不同温度下的酯酶活性和酰胺酶活性。

The model has a good prediction at lower temperatures, while it is bad at higher temperatures where the solid phase was no existing and peptide product would be hydrolyzed because of the presence of amidase activity.

这是因为该模型未能考虑在偏高温度范围内酰胺酶活性对肽产物的水解作用,但这并不影响该模型对低温下肽合成产率变化的良好的预测性能。

Evaluated, in the four stages of one month, 3 months, 6 months and 12 months after restoration, their Plaque Index, Gingival Index, Gingival Bleeding Index, Probing Depth and X-ray bone absorption. Subgingival plaque samples were isolated and cultured by the selective medium of black-pigment bacteria, F. nucleatum, Actinomyces viscosus and anaerobium.

临床选取32名种植患者的44枚种植体,记录了修复后1个月,修复后3个月,修复后6个月,修复后12个月四个时段,入选种植牙的菌斑指数,牙龈指数,牙龈出血指数,探诊深度;采用产黑菌、放线菌、具核梭杆菌及厌氧菌的选择性培养基对龈下菌斑标本进行了分离培养。

The probabilities of the individual pathways of the fragments at 234 nm were calculated from the relative quantum yield and angular distribution.

结合各向异性参数和量子产率,计算了n-C7H15Br分子在234nm波长下不同解离通道的比例。

Anisaldehyde was synthesized from p-hydroxybenzaldehyde with dimethyl carbonate by microwave irradiation under phase transfer catalyst tetrabutylammonium bromide, The effect of power, time, solvent and catalyst of reaction on yield were researched.

以四丁基溴化铵为相转移催化剂,采用对羟基苯甲醛和碳酸二甲酯为原料,微波辐射下合成大茴香醛。考察了反应溶剂、功率、时间和催化剂对反应产率的影响。

The more active catalyst and the more suitable carrier should be selected further not only to heighten the yield of MPC and DPC,but to avoid the production of anisole at above 250℃.

由此可以知道,要想使得MPC、DPC产率增加需选择更适合的催化剂,而对于高温下气固相反应应该选择更适合的能有效抑制苯甲醚副反应发生的催化剂载体。

It means that dilapidated atoms pressed by self attraction produce differentiation according to the size of atomic density.

残破的原子在自引力作用形成的压力作用下,按原子密度的大小产生分异,"内核"多为显示有正电性能的密度较高的残破原子组成,"外核"为富含"公有化"电子而显示负电性能的密度相对较低的残破原子组成,这是一个地核物质量子状态变化的静态过程。

The experiment optimized the culture medium and conditions for PV 1 to yield the highest GABA: sucrose as carbon source,peptone and beef extract as complex nitrogen source,initial pH at 7.0,temperature at 30~34 ℃.The content of GABA was over 4 g/L in the optimum culture conditions.Thereby,i...

实验还对酸菜1号菌株的培养基和培养条件进行了优化:用蔗糖为碳源、蛋白胨和牛肉膏作为复合氮源、培养基初始pH为6.0、培养温度为30~34℃时该菌株发酵产GABA的量最多,发酵过程中的振荡培养(100 r/min)和静置培养对GABA的产量无明显影响;在最佳培养基组合和发酵条件下,发酵液中GABA含量可达4 g/L以上,表明利用乳酸菌进行富含GABA食品的生产是可行的。

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But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊!不用提了。提到肉,真是糟透了。

Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.

Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。