这可能部分源于分离寡聚物成本高耗时长——从数百公斤干燥的植物样本中可能只能分离得到数毫克的纯品。
This is partly because isolating the oligomers is both costly and time-consuming - processing hundreds of kilograms of dried plant material often yields only a few milligrams of a single product.
最后是那些为数甚多、通常低于海平面的火山，它们在板块分离、新壳产生的延展脊状突起上形成。
Finally there are those-a great many, but normally deep under the ocean-formed at the spreading ridges where tectonic plates pull away from each other and new crust is formed.
通过选择不同结构、不同碳数的醇做流动相的极性改性剂，优化了色谱分离结果。
The chromatographic conditions were optimized using different alcohols as mobile phase modifier. The effect of temperature on chiral separation was investigated.
用抑菌圈法测定，共得到9株对番茄溃疡病菌有拮抗作用的内生细菌，占分离内生细菌总菌数的4.84%。
According to the test of inhibiting the growth of Clavbacter michiganensis subsp. michiganensis, 9 strains have antagonistic activity against the plant pathogen, occupied 4.84% of isolated bacteria.
这个步骤耗时最长，因为需要将大豆浸泡数小时，才能实现分离。
This step takes the longest because the beans have to soak for hours before they are ready for separation.
分析表明，焦移的大小与菲涅尔数、透镜-光阑的分离程度以及入射波波面曲率半径等因素有关，并得出了消除焦移的条件。
The analysis that the size of the focal shift is related to the factors such as Fresnel number, separating degree of lens-diaphragm and curvature radius of incident wave wavefront, etc.
色谱系统的适用性试验通常包括理论板数、分离度、重复性和拖尾因子等四个指标。
Applicability test of chromatographic systems usually include 4 indicators including theoretical tower number, separating degree, repeatability and trailing factor.
在自行设计的动态误差实验系统中，同步采集标准信号（电机脉冲数）和测量信号（光栅脉冲数），实时比对分离出动态误差。
In a self-designed dynamic error experimental system, the standard signal (motor pulses) and the measured signal (grating pulses) were collected synchronously, and isolated the dynamic error.
其中以第15天胚胎肝脏分离所获的细胞数和培养形成的集落数最多、生长状态最好。
Among groups, the maximum quantity of isolated stem cells and the best situation of growing (maximum growing colonies) were obtained from ED15 group.
讨论了低雷诺数空气动力特性，包括分离气泡和展弦比的影响。
The aerodynamic characteristics of low Reynolds number, the influence of separation bubble and aspect ratio are discussed.
第二，应用分离分析法确定内蒙古绒山羊胎产羔数的遗传方式。
Second, the segregation analysis was applied to determine inheritance mode of litter size in Inner Mongolian cashmere goat.
结果：与对照组相比，模型组牙槽骨骨小梁面积百分数、骨小梁厚度，骨小梁数量、骨小梁分离度差异均没有统计学意义。
Results: Compared with control group, no difference in percent trabecular area, trabecular thick ness, trabecular number and trabecular separation was found in model group.
计算结果系统地显示了分离结构随雷诺数的变化情况及分离涡的空间结构。
The results reveal systematically the change of separation structures with Reynolds Number and the spatial forms of separation vortices.
低雷诺数翼型流动的一个重要特征是分离泡的产生，并且分离泡通常是非定常的。
The presence of the separation bubble is an important feature at low Reynolds number airfoil flows, and the separation bubble is usually unsteady.
文中介绍了扇面直波导及其腔体中电矢量位和磁矢量位的格林函数，采用分离变量法、傅里叶变换法和留数定理导出了格林函数的具体表达式。
The Green's functions for electric and magnetic vector potentials in a sectoral wave guide and its cavity are derivated by using the separation of variables, Fourier transform and residue theory.
实验研究了层析的洗脱条件，计算了层析柱的分离度及理论塔板数。
The desorption condition of chromatography is studied, the resolution and the theoretical stage number are calculated.
分离涡、两侧边界层流动以及侧向力均对于雷诺数不敏感。
The vortices, boundary layer state and side force are all insensitive to the Reynolds number.
结果表明，加入合适的萃取剂可有效地提高旋光性戊醇对异戊醇的相对挥发度，减少分离所需的理论板数。
The results showed that addition of appropriate extracting solvent could increase the relative volatility of active amyl alcohol and decrease the number of theoretical plates.
就盲分离在阵列信号处理中的应用，提出了一种基于四阶累积量的源数估计方法。
Based on the application of BSS in array signal processing, a method of estimation signals number was proposed.
结果表明，照射后棒状二价体数明显上升，二价体提前分离增多，而二价体的交叉数却呈下降趋势。
The results indicated that both the number of rod bivalents and the number of pre-division bivalents increased markedly after radiation, while the number of bivalent chiasma tended to decrease.
分别计数白细胞总数、嗜中性白细胞数和淋巴细胞总数，测定ND抗体效价； 分离胸腺、脾脏和法氏囊，分别称重。
Total leucocyte amounts, neutrophilic leucocyte and lymphocyte amounts, ND antibody level were measured and thymus, bursa Fabricii, spleen were weighed.
分别计数白细胞总数、嗜中性白细胞数和淋巴细胞总数，测定ND抗体效价； 分离胸腺、脾脏和法氏囊，分别称重。
Total leucocyte amounts, neutrophilic leucocyte and lymphocyte amounts, ND antibody level were measured and thymus, bursa Fabricii, spleen were weighed.
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