选择性

Adding methanol to the reaction system could enhance the conversion of HDA and the yield of HDU-M notably. So the ammonolysis was apt to the SN1 scheme.

反应体系中引入甲醇溶剂可显著提高反应的转化率及选择性，认为DMC胺解过程更倾向于按 SN1机制进行。

Studies on sequence changes in the early genomes of interspecific F_1 hybrid and amphidiploid in CucumisIn the present study,extensive genomic changes were detected in newly obtained allotetraploid of Cucumis,namely Cucumis hytivus Chen and Kirkbride,by AFLP analysis using 12 pairs of EcoR-I/Mse-I primers.

甜瓜属远缘杂种F_1及人工异源双二倍体早期基因组序列变化研究利用12对Eco RI/Mse I选择性引物，对甜瓜属人工异源双二倍体C.hytivus及其二倍体父母本进行AFLP分析，结果发现多倍体基因组在形成早期发生了广泛的序列变化。

Robberies on the sea occur in such broad areas that they cover both the sea and the land, with ampler premeditation and preparation.

海上抢劫犯罪活动区域非常广阔，涉及海上和陆上；犯罪预谋性强，准备比较充分；犯罪多为团伙作案，成员复杂；犯罪行为暴力色彩浓厚；窝赃销赃地选择性大；犯罪案件侦查涉外因素较多，取证较为困

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 unisexual flower is caused by the selective abortion of androecium or gynoecium in the hermphroditic primondia.

单性花的发生是由于原两性花原基的雌蕊或雄蕊选择性败育所造成的。

For elective surgery, patients are rarely admitted more than 24 hours in advance and may not be seen by the anesthetist until the evening prior to surgery.

对于选择性手术，病人很少在24小时前入院，因而有可能在手术前晚麻醉医生才有机会看到病人。

The indirect selective electrochemical oxidation of anethole to anisaldehyde with Ce4+/Ce3+ as redox mediator system was studied in this thesis.

研究了以茴香脑为原料，用Ce4+/Ce3+为氧化还原媒质，选择性间接电氧化合成茴香醛。

We have determined the crystal structure of the human A2A adenosine receptor, in complex with a high-affinity subtype-selective antagonist, ZM241385, to 2.6 angstrom resolution.

我们已经在复杂的具有高亲和性亚型选择性拮抗剂ZM241385中，已经确定了以2.6埃分辨率的人类A2A腺苷受体晶体结构。

Dihydroxy-7, 4′-dimethoxy-dihydrflavonol and -3, 5, 7 -trihydroxy-4′-methoxy- dihydrflavonol were synthesized by selective protection, condensation, epoxidation, cyclization and deprotection from 2, 4, 6-trihydroxyacetophone and anisaldehyde.

以2，4，6-三羟基苯乙酮和茴香醛为起始原料，经选择性保护、缩合、环氧化、关环等步骤首次完成了-3，5-二羟基-7，4′-二甲氧基二氢黄酮醇和-3，5，7-三羟基-4′-甲氧基二氢黄酮醇全合成。

By analyzing the differences between acidic and basic catalytic action in this transesterificatios, it is considered that the main cause of yielding an anisole by-product is due to the basic catalysis, a Lewis acidic catalyst is helpful for the selective DPC formation.

通过分析酸碱催化作用在酯交换反应中的差异，认为碱催化是副产物苯甲醚生成的主要原因，Lewis酸性的催化剂有利于碳酸二苯酯的高选择性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。