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Porous carbons were prepared with tetraethyl orthosilicate as the silica template and solube starch and β-cyclodextrin as carbon precursor by sol-gel method.

以正硅酸乙酯为模板硅源，β-环状糊精和可溶性淀粉分别为碳前驱体，运用溶胶-凝胶法制备了多孔炭材料。

A kind of spherical microporous silica was synthesized by precipitation with the tetraethyl orthosilicate as a silica precursor and the block ploymer P_(123 as a template. The characterizations by the BET, FSEM and XRD showed that the spherical microporous silica has diameter of 3～4 μm, amorphous pore size of 0.9～1 nm and the specific area of 216±

以正硅酸乙酯作硅源，嵌段共聚物为模板剂，采用沉淀法合成均匀的实心球形二氧化硅微孔材料，BET、FSEM和XRD等表面分析手段表征表明，我们合成的二氧化硅微孔材料具有3～4μm的粒径和不规则分布的0.9～1nm的孔径以及216±3.5m2/g的比表面积。

This investigation was prepared MCM-41 catalyst films on silicon wafer in ammonia media, using tetraethyl orthosilicate as a precursor and cetyltrimethylammonium bromide as a surfactant.

中文摘要本研究以四乙基氧矽溶液为矽酸盐的来源，溴化十六烷基三甲基铵盐为界面活性剂，在氨水的环境下，制备MCM-41触媒薄膜於矽晶片上。

Monolayer high anti-reflective coatings are coated by sol-gel method with tetraethyl orthosilicate and silicon oil(MW≈500) as precursor and ammonia as catalyst.

以正硅酸乙酯和硅油为前驱体，在碱性催化体系中制备出有机硅改性二氧化硅溶胶，采用提拉法获得了具备疏水性能的二氧化硅减反膜。

In this paper, SiO_2-based air-water interfacial films with nano structure are templated by cationic surfactant cetyl trimethyl ammonium bromide with tetraethyl orthosilicate as precursor.

本文以正硅酸乙酯为前驱体、以十六烷基三甲基溴化铵为模板，用自组装的方法在特殊的区位——空气—水界面上制备了SiO_2的无机纳米薄膜。

Now it is accepted that osteoblasts, in addition to being directly responsible for bone formation, also indirectly control bone resorption by mediating osteoclastic precursor cells differentiation and mature osteoclasts function.

现在普遍认为成骨细胞除了具有骨形成的直接功能以外，还能够通过介导破骨细胞前体细胞分化和成熟破骨细胞活化过程间接控制骨吸收。

Unlike previous models in which overexpression of the amyloid precursor protein results in amyloid plaque formation, have produced mice that overexpress only Aβ40 or Aβ42 and prove that Aβ42 is critical for the formation of amyloid deposits in vivo.

不同于早先调控淀粉样蛋白前体蛋白的动物模型，McGowan 等(Neuron， Vol 47， 191-199， 21 July 2005)培养了专一表达Aβ40或者 Aβ42的老鼠，结果直接证明了Aβ42 确实是引起淀粉样蛋白沉淀的主要因素，而不是Aβ40。

At the first part of this work, the basic characteristics and the development of the research on the oxyfluoride glass ceramics was reviewed, and the optical properties of oxyfluoride glass ceramics doped with Ho〓, Er〓, Tm〓 ions, also that of the precursor oxyfluoride glasses was studied.

本工作第一部分对氟氧化物玻璃陶瓷的基本特点、研究概况进行了综述，同时，对Ho〓，Er〓，Tm〓离子掺杂的氟氧化物玻璃陶瓷及其前驱体—氟氧化物玻璃材料的基本光谱性质进行了研究。

Our first paper is a theoretical treatment, from a geochemical perspective, of how the sophisticated machinery doing this reaction may have arisen, what precursor chemistries may have been used, and what evolutionary steps occurred to get to oxygenic photosynthesis.

我们的第一篇文章是从地球化学的角度，在理论上分析光合作用的复杂机制的可能成因，其中使用了什么前体化学物，以及产氧的光合作用的进化途径。

By means of contrasted immobilization of denitrifying bacterium on several kinds of carbon fibers, the effect of physical and chemical characteristics such as specific surface area, precursor and recycle, especially the surface oxygenic functional group on these carbon fibers was investigated.

通过对比反硝化菌在不同基体碳纤维表面的固着化及碳纤维表面含氧官能团对菌种的固着化实验，研究了碳纤维(基体、比表面积、循环利用性等)特性，尤其表面含氧官能团对反硝化菌固着化的影响。

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％。