查询词典 variable density system

Using this model three competence-deficient pneumococci, which was identified by PCR and transformation experiment, were constructed. It is found different strain has different bacterial optimal density for being induced into competence. The optimal density for strains 1, 2 and 22 was 0.1, 0.08and 0.07 respectively. The optimal condition for transformation is c plus y culture at pH8.0. In c plus y culture at pH6.8, which restrained pneumococci forming transformation naturally, pneumococci could be induced to form transformation by CSP.It is concluded that we could induce different S.pneumoniae by CSP into competence in their optimal density in laboratory. 2. It was discussed the relationship between pneumococcal transformation formation and its opportunistic pathogenesis. Comparing their virulence with that of parental strains by challenging mice intraperitoneally and adhering to ECV-304 cell respectively.

结果表明不同肺炎链球菌株的转化最适菌密度不同，1、2和22号菌株的最适转化密度分别为0.1、0.08和0.07；用于转化的CTM培养基最适为pH 8.0的C+Y培养基；在自然转化下不能诱导转化发生的pH 6.8的C+Y培养基中，使用CSP诱导，也能促使细菌发生转化，只是转化效率较低；结论：实验室条件下，不同细菌在一定菌密度时可利用CSP诱导肺炎链球菌成为感受态发生转化。2、为探讨肺炎链球菌转化对毒力表达的影响，本研究分别通过体外粘附人脐静脉血管内皮细胞ECV-304和体内小鼠毒力实验观察1、2和22号肺炎链球菌和其转化缺陷菌株1t、2t和22t毒力的差异。

The peak of dry matter production rate of density-tolerant variety LiaoDan 565 appeared at tasseling-milk stage, thin density variety DanYu 39 appeared from Tuba mouth stage to tasseling stages, which earlier than density-tolerant variety.

这一差异导致稀植品种由于前期徒长、经济系数下降而减产；相反密植品种由于干物质的运输与贮藏相对协调而高产。5、在密植育种中，很多性状在高低两种种植密度下的遗传特性存在较大差异。

Results 56cases had subarachnoid space hemorrhages.On CT scan,the lesions presented as band-shaped high density shadow that inside margin shows brush or combsat subtentorium except overtentorium.6cases had subdural hematomas.On CT scan,the lesions displayed as strip,long triangle or cresent high density shadowwith sharp margin.The other two cases had compound both lesion,and the high density shadowwas wider than simple.

结果 本组63例中，蛛网膜下腔出血55例，其特征性CT表现为小脑幕下的带状高密度内缘呈毛刷状或梳齿状；硬膜下血肿6例，可见沿幕缘单侧分布的边界清楚的直线形、长三角形或半月形带状高密度影；复合积血2例，其积血的区域高密度带多较单纯者为宽，适当降低窗宽和提高窗位隐约可见其密度差，呈分层现象。

The Issuance of insulation foam core concrete block housing is high-density concrete that molding density is 2200kg/m3 ~ 2300 kg/m3 and the density of the framework of the structure of basically is the same.

芯核发泡混凝土保温砌块壳体为高密度混凝土，成型密度在2200kg/m3～2300 kg/m3与框架结构中的密度基本相等。

Fifiteen experiment animals were divided randomly into normal control group, 12h-post-trauma group and 36h-post-trauma group (5 each). Immunohistochemistry and image analysis techniques were used to measure the area, optic density value and integrated optic density value and integrated optic density value of Ngb immunoreactive products in primary somatosensory cortex (S1) and retrosplenial granular b cortex, which was located in the inner side and out side of traumatic brain injury cavity in coronal section of rat brain respectively.

采用自由落体硬膜外撞击方法建立脑外伤模型，15只实验动物分为正常对照组及脑损伤12、36h组，应用免疫组织化学和图像分析技术观察伤灶周围第一躯体感觉皮质区(S1)和压部后颗粒细胞b皮质区内Ngb免疫反应阳性信号面积、光密度和累积光密度的变化。

Close correlation was also found between the SOD activity and the cell density and substance accumulation. When SOD activity is higher or lower than 0.710×10^8 cells^(-1)min^(-1), the cell density and accumulation of 13-carotene and protein were lower. When SOD activity reached 0.710×10^8 cells^(-1) min^(-1), the cell density, and accumulation of β-carotene and protein were the highest.

盐藻SOD活性与细胞密度及物质积累关系密切：在SOD活性为0.710×10^8 cells^(-1)min^(-1)左右时，盐藻细胞密度、β-胡萝卜素和蛋白质的积累量都最高，而在SOD活性较低或较高时，盐藻细胞密度、β-胡萝卜素和蛋白质的积累量都较低。

Results Fibronectin existed in dental pulp and predentin, and also in space between the wall of dentinal tubule and process of odontoblast in mature dentin. They were mostly distributed in odontoblast layer and round blood vessels and nerves. In the crown pulp, integral optical density, length density and volume density were 0.49±0.33,38.44±20.7 and 24.56±10.8 respectively.

结果 纤维粘连蛋白免疫反应普遍存在于牙髓、前期牙本质和成熟牙本质的牙本质小管与成牙本质细胞突起，以成牙本质细胞层，牙髓血管与神经周围最为丰富。

This paper sets up demand mathematical model of highway based on statistical data of population, GDP and total length of highway and theory of production function,and quantify analyses relationship of highway density with population density and PGDP and its development. And research the population, economic and society of different degree affecting on highway, and the note worthily distributing rule of highway density and andlyses its reason by habit depend on index.

以人口、国民生产总值及公路里程统计数据为基础，根据生产函数理论，建立公路需求数学模型，定量地分析我国各省区公路密度与人口密度、人均GDP关系及动态变化，揭示了人口、经济、社会因素对公路建设不同程度的影响以及公路密度显著的区域性分布规律，并用公路密度依赖－偏好指数分析其原因。

Using the first-principles self-consistent discrete variational method based on density functional theory, we investigated the effect of alloying element Mn on the electronic structure of the kink on the [100](010) edge dislocations in bcc iron. We calculate the structural energy, the interatomic energy, the local density of states and the charge density.

用基于密度泛函理论的自洽离散变分方法研究了合金元素Mn对bcc Fe中[100](010)刃型位错上扭折的电子结构的影响，计算了格位能、原子间相互作用能、电荷密度及态密度等物理参量。

Then in the high-temperature-low-density area, we discuss the characteristics of the distribution functions, and use them to get the net baryon density and the energy density.

结果表明重子数密度和能量密度与高能重离子碰撞实验的唯象分析有关。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。