下的

The rules of photo bioactivities are: Without illumination, the tested xanthene derivatives showed almost the same level of inherent toxicity to the same organism, which showed the inherent toxicity of xanthene derivatives were primarily dependent on the structure of parent molecule. Upon illumination, the photosensitizers showed obvious phototoxicity to all organisms. The xanthene derivatives showed stronger phototoxicity to Gram-positive bacteria. With the increasing number of halogen substituents, the singlet oxygen yields increased and the phototoxic activity increased too.

呫吨类化合物的生物活性的变化规律为：未经光照的条件下，呫吨类化合物的对同种待测微生物的固有生物活性基本相同，说明固有毒性可能主要决定于化合物分子的母核结构，其卤素取代基团对其影响较小；经实验光源照射下，所测MLC值明显低于未经光照条件下的值，表明呫吨类化合物对三种微生物的光敏活性明显强于对其相应的固有活性；呫吨类化合物对革兰氏阳性菌能发挥较大的光敏活性。

First of all,we tested the germination and water uptake rate of 47 species typical xerophil seeds grow up in north China from 20 families,38 genuses under sufficient water and different Grads water stress by high-molecular-weight polyethylene glycol(PEG6000).The results show that Xerophil seeds from the same habitat exhibited similar patterns in response to water stress.Xerophil seeds from arid community were stronger in germination and imbibition than that from other two communities under serious water stress,whereas Xerophil seeds from humid community were sensitive to any degree of water stress.Namely,the seeds live in arid habitat possessed high germination and quickly water uptake in sufficient water or any degree of water stress,but the others grow up in humid habitat shown significant difference which germination and water uptake well under sufficient water but inhibited even if slight water stress.

首先，我们通过对20个科，38属，47种旱生植物种子在水分充足和不同梯度的干旱处理(聚乙二醇PEG6000)条件下的萌发率及吸水率实验发现，当水分胁迫强烈时，分布于干旱沙漠地区的植物种子其吸水率和萌发率都高于半干旱和湿润地区的植物群落，相反，湿润地区植物种子的吸水率和萌发率对任何的水分胁迫都表现出敏感的响应趋势，也就是说，生境恶劣的植物种子在较强的干旱胁迫下，仍然保持了较高较快的萌发率及吸水率，水分充足与水分缺乏时无显著差异，而生境相对较好的植物种子在水分充足情况下萌发与吸水良好，但在干旱胁迫时则受到明显抑制，水分充足与水分缺乏时差异显著。

A dyn amical visual analysis is done about a shrouded impeller which is used in a large-scale compressor unit on the basis of visual theory and finite element analysis theory with the combination of SolidWorks and ANSYS . With the vibration characteristics of the impeller under the inertial force, we get to know whether the impeller with given conditions can avoid from the resonant frequency or not and its influence of vibration on system.

以可视化理论、有限元分析理论为基础，结合三维建模软件SolidWorks和有限元分析软件 ANSYS 对某压缩机组用闭式叶轮进行动力学可视化分析，得到其在惯性力作用下的振动特性，可以判断其在给定工况下能否避开共振频率以及评估其振动对系统的影响。

Through the study of the relevant documents and learning from her own experiences, the author completely analyzes research at home and abroad, the teaching theoretic bases, and the basic characteristics and types of the teaching of collaboration-based study in the network environment , and discusses the essential factors、 ways、 appraisement、 practice of the collaboration-study teaching in network environment. Furthermore, the author, by referring to her own teaching experiences, advances the collaboration-study teaching model and teachings appraisable target system in the network environment .

本人通过对相关文献的研究和自身教学实践过程中的体会，从基于网络环境下的协作学习教学的国内外发展现状、协作学习的教学理论基础、基本特征和基本方式等几方面对网络环境下协作学习的教学进行了分析，并阐述了网络环境下协作学习教学的要素、教学形式、网络协作学习教学的评价和实施。

Adhesive forces and contact area between arolium and the target surface were measured when Lycorma delicatula walked on the level and slided on the vertical surface. A model of peeling theory was put forward to give relationship between contact area and adhesive forces.

测量了斑衣蜡蝉在切向和法向两种状态下的抓附力以及在切向和法向两种状态下抓附时中垫与接触面的接触面积，分析了接触面积和力的关系。

Is the sun able to rise in the place falling behind, and fall behind in assurgent place?

太阳会在落下的地方升起，并在升起的地方落下吗？

The liquid-liquid equilibrium binodal curves and the tie-line data of an epoxy cotton seed oil/acetic acid/water ternary system.

测定了环氧棉籽油－醋酸－水三元系分别在30℃，40℃，50℃，60℃下的液－液平衡双结点曲线，以及在40℃，50℃，60℃下的液－液平衡系线数据；分别应用物料衡算法和系线中点轨迹法对实验数据进行了检验。

In order to ascertain the worst section under various load cases, this paper studies and analyses the stress distribution on the hole edge of the circular hole castellated beams under loads acting.

研究分析了圆形孔蜂窝梁在荷载作用下孔周边的应力分布，确定了在各种荷载状态下的最不利截面。

During the experimental conditions, the activitys of SOD, POD and MDA of Ceratophyllum demersum L changed greatly, and raised rapidly in the late of experiment, which indicated that those two submerged macrophytes got more nutrient stress than Myriophyllum spicatum L, and the nutritional stress-resistant ability of Myriophyllum spi-catum L was higher than those two submerged macrophytes in the medium nutritional condition.

在本试验条件下，黑藻生物量小，而金鱼藻SOD活性、POD活性和MDA质量分数变化幅度大，在试验后期急速上升，表明这两种沉水植物受到的营养盐胁迫较狐尾藻大，而狐尾藻在中营养水平下的耐营养盐胁迫能力较强。

Then, the proliferative ability of OPCs in vitro was also investigated with the MTT assay.4. The contusive injury of spinal cord in a rat model was produced by the means of the weight-drop impact of Allen's method. The experimental animals were randomly divided into 4 groups, i.e. OPCs transplant group, transplant control group, plain injury group and sham operation group.

OPCs在体外化学条件培养基中继续生长，通过相差显微镜连续观察和免疫细胞化学技术检测研究分析体外条件下OPCs的定向分化规律和分化成熟情况，并采用MTT检测法研究分析OPCs在体外条件下的分裂增殖能力。4。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。