丁酸

When SiO〓-NH〓-Rh-Co complex was used to catalyze the hydroformylation of methyl methacrylate, an optimal conversion of 93.4% and optimal selectivity of 84.4% for the normal aldehyde were both obtained at Rh/Co ratio of 2/1, which were both higher than that catalyzed by SiO〓-SiNH〓-Rh and SiO〓-Si-NH〓-Co momometallic catalysts. Clearly a synergistic action between Rh and Co atoms presented in the complex.

我们以SiO〓-Si-NH〓-Rh-Co催化甲基丙烯酸甲酯的醛化反应，当催化剂中Rh/Co比为2/1时，催化活性最高，可达93.4％，对正构产物β-甲酰异丁酸酯的选择性达到84.4％，都高于单金属催化剂，表明了金属间存在相互作用。

Results Nuclear magnetic resonance and mass spectrography showed correct structure of the synthetic conjugate toxin.

结果合成的偶联毒素经核磁共振和质谱分析鉴定，表明结构正确，纯度达90%以上，对HepG2细胞的抑制效果弱于苯丁酸氮芥，但对ECV304细胞的抑制特异性较好。

Methods: Lecithin and the sucrose ester-phospholipids liposome were prepared using the ethyl ether injection method by mixing sucrose ester with lecithin, sphingomyelin and cholesterol according to different lipids ratio.

按不同比例将乙酸异丁酸蔗糖酯与卵磷脂、鞘磷脂和胆固醇混合，溶于乙醚中，然后注入pH7.2的PBS缓冲液中，制成卵磷脂脂质体及蔗糖酯－卵磷脂脂质体。

At passage 3, cells were induced by 3 mmol/L sodium butyrate and 0.1% dimethyl sulfoxide for 5 days. Cells were harvested for Western blotting assay.

细胞培养到第3代时，分别用3 mmol/L丁酸钠盐与0.1% DMSO进行诱导，5 d后收集细胞进行Western blotting实验。

In the experiment, the variousfactors which influenced the synthesization of 3-hydroxybutic acid were studied.

对影响3-羟基丁酸合成的各种因素进行了考察。

Considering GABA content and quality components of tea leaf, the optimum conditions ofanaerobic treatment on fresh...

综合γ-氨基丁酸含量和各项茶叶品质成分指标，确定茶鲜叶厌氧处理的最佳条件为：真空、25℃、8h。

Rapid eye movement sleep consists of a dreaming state in which there is activation of the cortical and hippocampal electroencephalogram, rapid eye movements, and loss of muscle tone. Although REM sleep was discovered more than 50 years ago, the neuronal circuits responsible for switching between REM and non-REM sleep remain poorly understood. Here we propose a brainstem flip-flop switch, consisting of mutually inhibitory REM-off and REM-on areas in the mesopontine tegmentum. Each side contains GABA (gamma-aminobutyric acid)-ergic neurons that heavily innervate the other.

快动眼睡眠是一个包括有皮层和海马脑电活动的睡梦状态，可见眼球的快速运动和肌张力减低，尽管快动眼睡眠已经被发现50余年了，对其与非快动眼睡眠之间的神经回路却知之甚少，我们用脑干触发转换器，包括脑桥背盖区一个互相抑制的快动眼-关、快动眼-开区域，每侧均包含高度互相支配gamma氨基丁酸能神经元。

BACKGROUND: Copolymers of 3-hydro-xybutyrate and 3-hydroxyvalerate is a synthesized product of microorganism in unbalance growth environment, characterizing by degradation and thermoplasticity.

背景：聚羟基丁酸-羟基异戊酯是微生物在生长条件不平衡状态时合成的产物，具有可降解性、热塑性，作为组织工程的新型支架材料，越来越受到重视。

A Silvery ABS plastic surface paint was given by mixing thermoplasticity acrylic resin with cellulose acetate butyrate and different addition agents , the cohesion mechanism of the coat of the paint ,the election of solvents and the mixing of different addition agents were in detail reported.

用热塑性丙烯酸树脂，醋酸-丁酸纤维素，不同助剂等原料配制出ABS塑料用表面涂料-银色漆光油；并对涂层附着机理，溶剂的选用，不同助剂的调配作了较为详细的叙述。

The effects of Ca(superscript 2+) on seed germination promoted by γ-aminobutyric acid in Trifolium repens were investigated.

以白三叶为材料，研究了Ca(上标 2+)螯合剂、通道阻断剂以及通道抑制剂对γ-氨基丁酸促进种子萌发的影响。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。