缺氧的

The present results suggest that (1) NA is not mainly concerned with spontaneous discharges of chemoreceptor sensitive to hypoxia, but does elicit an increase in spontaneous discharges, and (2) the increase of chemosensory unit discharges produced by hypoxia can be inhibited by yohimbine.

结果提示：(1)NA不是维持颈动脉体对缺氧敏感的化学感受纤维自发放电活动的主要因素，但给予NA能增加此类纤维自发放电的频率；(2)在低氧过程中，给予#alpha#_(2)受体拮抗剂育亨宾，可减弱这类纤维对缺氧反应的程度。

The optically active defect centers of such types as E', two kinds of oxygen-deficiency and some kinds of oxygen-richness in silica play an important role in optical communication fiber and UV absorption. The researches on some oxygen-deficient defects and the metal ions doped or implanted semiconductor nanoparticles with fine luminescence properties have made it possible for silica to be used in the lighting field.

氧化硅材料本征E'、2种缺氧型以及各种富氧型光活性缺陷中心在光导纤维及紫外吸收等应用中扮演了很重要的作用，某些具有良好发光性能的缺氧中心及掺杂离子或半导体纳米粒子发光中心的深入研究使氧化硅材料在照明领域具有良好的应用前景。

Ultrastructural observations showed that, 10 minutes after ischemia, amorphous matrix dense bodies appeared in most of the mitochondria and the nuclei exhibited margination of chromatin.

上述结果提示，在心肌缺血早期，缺氧是造成不应期缩短的主要原因，而代谢产物和K~的蓄积则可能是引起传导阻抑的重要因素，并有加强缺氧所致心肌损伤的作用。

The RBC, Hb concentration, HCT, plasma EPO level and the relative values of EPO mRNA in renal tissue and pallium of mice were significantly higher in the flavonestreated group than those in the untreated group.

总黄酮是马齿苋抗缺氧作用的有效成分，其延长小鼠缺氧生存时间的机制可能是促进EPO的表达以及红细胞和血红蛋白的生成。

We examined the metabolic change in responses to anoxia in American cockroach, Periplaneta Americana by measuring the O2 consumption, CO2 production and respiratory quotient.

本研究测量美洲蟑螂的氧气消耗量、二氧化碳排出量与呼吸商，以探讨缺氧对其代谢的影响，连续在氮中缺氧超过38小时的蟑螂，除活动力下降外，行为上无明显的变化。

The early Palaeozoic black shales widely distributed in southern China, which were majorly formed in followimg periods: Hetang period of Early Cambrian, Miaopu period of Middle Ordovision, Wufeng period of Late Ordonision and Longmaxi period of Silurian.

本文通过对四期缺氧期间黑色页岩的分布、沉积特征及古构造、古地理背景的研究，指出华南缺氧事件和黑色页岩的形成可以由地内或地外的多种因素引起。

There are two branches stretched into China from Tethys during Cenomanian–Turonian in the Cretaceous, including the south branch, where occurred OAE2 in the Tibetan region, and north branch, where existed OAE2 in the southwestern of Tarim Basin too, thus it provided another evidence for OAE2's globality.

白垩纪Cenomanian-Turonian时期古特提斯海伸向我国的南北两个分支，其南支在西藏地区存在OAE2大洋缺氧事件，而北支在塔里木盆地西部也存在OAE2事件，这对丰富我国白垩纪事件研究、进行全球白垩纪OAE2大洋缺氧事件对比及其成因机制的探讨、查清塔里木盆地白垩纪古环境和烃源岩大规模形成的古气候控制因素以及白垩纪海相生物群演化、更替及其与重大地质事件的联系等具重要意义。

2The distribution of HIF-1 a and COX-2 was unequal;.(3)These findings indicate that HIF-1a and COX-2 may be two important factors in pulpal lesions and there is a significantly hypoxia condiction in inflamed pulp .(4)The increase of HIF-1 a is a possible mechanism for hypoxia preconditioning .(5)Our results suggested that pulpal fibroblasts as well as macrophages might be involved in the pathogenesis of irreversible pulpitis.

和COX一2的表达均有不同程度的变化，在牙髓炎病程中可能发挥着重要的生理和病理作用，③在牙髓炎进程中和牙髓自身修复过程中存在着缺氧环境和缺氧耐受机制，④牙髓成纤维细胞有可能与单核巨噬细胞一同参与牙髓炎的病理进程，且具有修复和免疫功能。

Methods The ARPE-19 cells were put into normal and hypoxic chamber respectively.After 0hr、8hr、24hr、48hr,the proliferation of ARPE-19 cells was evaluated by[3-(4,5-dimethylthiazole-2yl)-2,5-diphenyl tetrazolium bromid, MTT]-test.

第一部分缺氧人视网膜色素上皮细胞株ARPE-19表达特性目的观察缺氧对人视网膜色素上皮株ARPE-19的细胞形态、增殖以及对其分泌的血管内皮生长因子和色素上皮衍生因子表达的影响。

CoCl2 (a chemical hypoxia-mimetic agent) was used to establish the chemical hypoxia-induced PC12 cell injuries model. Sodium hydrosulfide was used as a H2S donor. The viability of PC12 cells was measured by CCK-8 assay. The percentage of apoptotic cells was assessed by propidium iodide stain flow cytometry. The morphological change of apoptotic cells was tested by using the chromatin dye Hoechst 33258. The mitochondrial membrane potential was analyzed by rhodamine 123 staining and photofluorography. The level of reactive oxygen species in PC12 cells was measured by DCFH-DA staining and photofluorography.

应用化学性缺氧模拟剂CoCl2在PC12细胞建立化学性缺氧损伤模型；以硫氢化钠作为H2S的供体；应用CCK-8比色法检测细胞存活率；碘化丙啶染色流式细胞技术检测细胞凋亡率；Hoechst33258染色检测细胞凋亡的形态学变化；罗丹明123(Rh123)染色荧光显微镜照相检测细胞线粒体膜电位；2'，7'-二氯荧光黄双乙酸盐染色荧光显微镜照相检测细胞内的活性氧水平。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐