破坏能力

Through the low cyclic load test of eight high strength concrete-filled square steel tubular columns, considering the effect of the axial compression ratio, steel ratio and slenderness ratio, the hysteretic curve, ductility, degradation of stiffness, energy dissipation capacity, failure mechanism and characteristics of the specimens were researched.

摘要］以轴压比、含钢率和长细比为参数，进行了8根方钢管高强混凝土柱的低周反复荷载试验，研究分析了该类构件的滞回曲线、延性、刚度退化、耗能能力、破坏机理和破坏特征；并与型钢高强混凝土柱的受力性能进行了比较分析。

The seismic performance such as failure pattern,fai lure mechanism,hyst eresis loop curves,restoring-force model,displacement-restoring capacity,displac ement ductility,rigidity degradation and energy dissipation of two pieces of HPC frame with double-story and double-span are studied systematically by testing o f low reversed cyclic loading.

通过低周反复荷载试验对两榀双层双跨高性能混凝土框架的破坏形态、破坏机制、滞回曲线、骨架曲线、恢复力模型、变形恢复能力、位移延性、刚度退化、耗能能力等性能进行了较为深入系统的研究。

To investigate the effect of p38MAPK signal conducting pathway on livercancinoma cell's malignant phenotype induced by VEGF,we take theexperiment with cell growth test,scanning microscope and laser scanningconfocal microscope so that observe effect of p38MAPK signal conductingpathway on liver cancinoma cell growth,pseudopodium formation andframework of cytoskeleton induced by VEGF.results indicate that the cellbecame ellipse and there were more and thick pseudopodium in the cell'ssurface after being treated by VEGF,and destroyed framework ofcytoskeleton,which can be blocked by pretreated with a special inhibitor ofp38MAPK SB203580 so that VEGF promote metastasis by enhancing livercell migration and movement via p38MAPK signal conducting pathway,butVEGF promote cell growth without p38MAPK signal conducting pathway.

为进一步探讨VEGF通过p38信号传导通路诱导肝癌细胞转移时，对肝癌细胞恶性表型的影响，采用细胞增殖实验、扫描电子显微镜、激光扫描共聚焦显微镜观察VEGF对肝癌细胞增殖作用、细胞伪足形成、细胞骨架微丝结构的影响以及p38MAPK信号通路调控作用。结果显示，VEGF能够不通过p38信号通路促进肝癌细胞增殖；VEGF诱导肝癌细胞丝状伪足增多、增长，使细胞骨架微丝结构破坏、甚至消失。阻断p38MAPK信号通路，可以抑制VEGF诱导的肝癌细胞伪足形成，细胞骨架丝状结构呈束状，排列较规整。上述结果表明，VEGF可以通过p38信号传导通路诱导肝癌细胞伪足增多、增长，促使细胞骨架微丝结构破坏，使肝癌细胞迁移、运动能力增加，促进肿瘤转移。VEGF并不通过p38信号通路诱导肝癌细胞增殖作用。

Based on the research production, with three prestressed concrete hollow slabs from the bridge in active service for ten years, this essay studies the ultimate bearing power ,the load-bearing failure mechanism and structure reenforcement measures influence on them, through examination of each performance index, failing load test, theoretical analysis and computing research work.

对预应力混凝土桥梁结构在使用中存在的问题及国内外相关研究发展水平进行了综述，指出目前对旧桥预应力混凝土空心板实际极限承载能力进行相关研究的必要性及其重大意义； 2、对旧桥预应力混凝土空心板的混凝土强度、碳化深度、预应力筋的锈蚀状况以及裂缝状况的检测评定； 3、通过破坏荷载试验，对损伤旧桥预应力混凝土空心板的受力性能进行试验评定； 4、采用在桥面做混凝土叠合层的加固措施，通过破坏荷载试验对加固后的旧桥预应力混凝土空心板的受力性能进行评定； 5、提出在役旧桥预应力混凝土空心板的维护、加固和使用建议。

As to'Cabemet Sauvignon'and'Queen of Vineyard', which belong to the'West Europe Cultivars Group', no obvious decline of Fv/Fm was found in their potted plants even under severe drought stress. Their photosynthetic abilities also greatly recovered after rewatering, i. e. no serious photodamage was formed in these cultivars under drought stress. Between them, the φPSⅡ of 'Queen of Vineyard'under severe drought stress was much lower than that of'Cabernet Sauvignon', which suggested that the light use efficiency of the former was much lower than the latter under severe drought stress. The potted plants of'Autumn Royal'and'Rizamat' sustained high Fv/Fm and φPSⅡ before moderate drought stress, but seriously declined under severe drought stress, which indicated that these cultivars had a weak resistant ability to extreme drought stress. A hybridized cultivar of Vitis vinifera L. and V. labrusca L.,'Red Double Taste', its Fv/Fm and φPSⅡ expressed mild decline along drought stress grade.φPSⅡ of'Red Double Taste'was the highest among seven cultivars under severe drought stress condition, which might closely connected with its high photorespiration activity. Another new cultivar,'Red Globe', and a rootstock,'1103Paulsen', the Fv/Fm and φPSⅡ of their potted plants declined markedly under slight drought stress, which suggested that they held a weak ability to defend against photoinhibition.

西欧品种群的赤霞珠和葡萄园皇后，其盆栽苗的Fv／Fm直到重度干旱胁迫下仍没有明显的降低，且复水后光合能力恢复程度较高，即干旱没有给这两个品种造成严重的光破坏，而两个品种之间，葡萄园皇后在重度干旱胁迫下的φPSⅡ明显低于赤霞珠，说明其光合器官在严重干旱胁迫时对光能的利用率较差；新品种皇家秋天和东方品种群的里扎马特在中度干旱胁迫下仍可维持较高的Fv／Fm和φPSⅡ，但在重度干旱胁迫下则降低幅度较大，说明其抵御极端干旱胁迫的能力较差；欧美杂种红双味的Fv／Fm和φPSⅡ随着干旱胁迫程度的增加呈现平缓的下降趋势，而且其φPSⅡ在重度干旱胁迫下是七个品种中最高的，这应该与其此时仍维持较强的光呼吸活性有关；红地球和砧木1103Paulsen的Fv／Fm和φPSⅡ在轻度干旱胁迫下就明显下降，表明干旱条件下其抵御光抑制的能力较差。

The protein envelop as well as the lipide membrane of HSV could be destroyed by surfactant, which destroys the DNA of HSV. Thus HSV loses the ability of infection. Sodium dodecyl sulfate is an anionic surfactant with biologic envelop denaturing potency.

HSV 的外部含脂质和蛋白质的包膜易为表面活性剂所破坏，引起胞膜通透性改变，使 HSV的 DNA 被破坏，从而失去感染能力。

Using MPR combined with MIP is helpful in the diagnosis and operation on the destruction of ossicular chain.

MPR对镫骨的整体显示优于MIP，MIP对听骨链破坏的显示能力优于MPR，两者相结合可以提高听骨链破坏的诊断率，为手术方式的制定提供重要信息。

The objective of this study is to understand the characteristics of photoinhibition and mechanisms of photoprotection in broccoli leaves.

明确青花菜叶片的光抑制特性和主要光破坏防御机制，为青花菜高产高效栽培和选育光破坏防御能力强的品种提供理论依据。

Both Fas and NO can lead chondrocyte apoptosis respectively and cause articular cartilage destruction. IGF-Ⅰ, TGF-β, bFGF, BMP and other growth factors are polypeptide agents that can influence cell activity by signal convection. They can accelerate chondrocyte proliferation and proteoglycan synthesis, play the local regulation action on formation and plerosis of bone and cartilage tissue by autocrine or paracrine. They have the ability to induce cartilage formation. Some investigations showed that growth factors can influence chondrocyte metabolism, synthesis of specific Ⅱ type collagen and proteoglycan by co-operation and inhibition. 1. 3 Situation of OA therapeutics The therapeutic methods of OA mainly comprised non-drug treatment, drug treatment, operation treatment, tissue and genetic engineering, et al. Drug treatment is the chief method among them.

若其活性发生改变，则将导致关节软骨基质成分的丢失和进行性破坏；软骨细胞凋亡与OA的发病密切相关，Fas与NO可各自独立介导软骨细胞凋亡，造成关节软骨破坏；IGF-Ⅰ、TGF-β、bFGF、BMP等生长因子是一组通过细胞间信号传递影响细胞活动的多肽因子，具有促进细胞生长、增殖与合成等作用，可通过自分泌或旁分泌方式对骨和软骨的形成和修复起局部调节作用，可促进软骨细胞增殖、分化与蛋白多糖的合成，具有较强的诱导软骨形成的能力，研究表明多种生长因子相互促进、相互抑制，以协同或拮抗方式影响软骨细胞代谢，影响软骨细胞特异性Ⅱ型胶原和蛋白多糖的合成分泌。

Secondly was honeysuckle and peach tree wood.So,in poor karst area,in order to link environmental benefits,eco-efficiency and social and economic efficiency,it were best measures to plant prickly ash peel or honeysuckle.It can improve capability of holding nutrient in short phase.,also it were beneficial to soil fertility,and hold back soil erosion.Sampled soil in a camphor slope,through analyzed on soil nutritive elements,like that Ca,Mg,Cu,Zn,Mn,Mo,Si,Fe,we had a deeper understanding with soil ground erosion and underground soil leaks.

通过时间对比分析，得出不同土壤利用方式下土壤养分保持能力和土壤退化的变化趋势，提出运用土壤指纹电荷方法对某一研究区域的土壤养分保持能力进行研究，可以减少研究区土壤的破坏程度，只要前期充分展开相关指纹电荷工作研究，制作图谱，后期研究则只需取少量土壤测定土壤pH值后查询前期土壤指纹电荷图谱即可得出某时段内土壤养分保持能力的变化趋势：通过对重庆南平镇石庆村人为生态恢复区不同土壤利用方式下前后一年土壤样品的分析，得出退耕后撂荒草地土壤的各项养分保持指标含量增长最快，对恢复土壤退化程度最为有利，其次是杉树林和樟树林；而从人为生态恢复的各种利用方式来看，花椒林土壤的养分保持能力最好，土壤退化恢复的程度最快，其次是金银花和桃林。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失