对称

The effects of some factors, such as reaction temperature, reaction time, substrate concentration and yeast concentration, on the acetophenone conversion and- 1-phenylethanol enantioselectivity were investigated by orthogonal experiments.

研究了酵母细胞催化芳香酮的不对称还原反应，采用正交试验综合考察了反应温度、反应时间、底物浓度和酵母浓度等因素对底物苯乙酮转化率和产物1苯基乙醇对映选择性的影响。

The yeast cells asymmetric reduction of aromatic ketone was also study in this work when the acetophenone was as the model substrate.

最后，以2一辛酮(2一Octanone)为模型底物研究了酵母细胞不对称还原前手性脂肪酮的反应特性。

Pedicels of female flowers slightly dorsiventrally and asymmetrically winged, or not winged; achene not articulated on pedicel.

雌花的花梗稍微的背面的和不对称的有翅，或者无翅；在花梗上的瘦果无节。

Pedicels of female flowers conspicuously laterally and symmetrically winged; achene articulated on pedicel.

雌花的花梗显著侧面和对称地具翅；瘦果在花梗上明显。

Its results showed that ratio of length to width of petal and sepal and the degree of flat of achene within population were characterized as the most stable characters and gradually increased with the increase of latitude.

结果表明，居群内，瘦果扁平度、花瓣长宽比、萼片长宽比变异最为稳定，居群间，这3个繁殖器官的相对性状呈现随着纬度的增加逐渐增大的趋势，并且随纬度的增加，核型不对称系数呈现不断增加而染色体总长不断减小的趋势。

Like almost all Acheulean tools, the axe has a symmetrical design.

就像绝大多数阿利舍工具一样，斧子形状是对称的。

Then the structure decomposed into a series of equivalent single degree of freedom system, the random wind-induced response and the equivalent static wind action based on Davenport spectrum of the structure with TLD are obtained. An example confirms this method.

此外，由于建立了将结构分解为一系列等效单自由度体系的一般方法，利用等效单自由度体系与抗震反应谱的关系，本文方法还可用于非经典阻尼非对称被动控制结构基于抗震反应谱的地震作用取值。

Asymmetrical dynamic propagation problems under the action of variable loads and (P^3t/x^2) located at the origin of the coordinates respectively, are resolved by the measures of self-similar functions, and the universal expressions of analytical solutions to stresses, displacements and stress intensity factors are gained.

采用自相似函数的方法对坐标原点分别受到变载荷Px/t、Pt^3/x^2作用下的非对称动态扩展问题进行求解，获得了应力、位移和动态应力强度因子解析解的一般表达式。

In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct "grand-design" spiral structure that is about 3,300 light-years long. Only galaxies with large-scale bars appear to have these grand-design inner disks — a spiral within a spiral. Models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central black holes. NGC 1300 is not known to have an active nucleus, however, indicating either that there is no black hole, or that it is not accreting matter.

星系演化除了像两个星系相撞那样的剧烈作用之外，还有自己内部很慢的演化，因为一个星系总会有一些引力不稳定，如上图中的NGC1300，它是一个棒旋星系，这种bar结构导致的引力不完全对称会驱使很多气体和尘埃损失角动量往里面落，我们可以清楚的看到dust lanes，有点像黑洞的吸积，但这个星系是个非活动星系，目前还没有黑洞存在的明确证据，but我相信肯定是有的，没有比在星系中心放一个黑洞再完美不过的事情了，或许这些下落的dust lanes是黑洞发光的开始呢。

Compared with conventional half-bridge topology, a branch comprising an auxiliary switch and a capacity is added in secondary circuit.

与传统的不对称半桥变换器相比，该变换器在变压器的副边电路中增加了一条由辅助开关管与谐振电容串联组成的辅助支路。

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％。