锑掺杂氧化锡ATO纳米导电粉体的研制     

何焕全  陈进中  伍祥武 《大众科技》2012,(8):106-107

通过设备和工艺的改进,寻求成本低、产率高、比表面积大的工业化锑掺杂氧化锡ATO纳米导电粉体制备方法。即在络合能力强的复合有机酸溶液中加入纯度99.9%以上高纯锡和高纯锑化合物,再滴加硝酸和氨水,进行凝胶化反应和聚合反应,得到棕色透明液体,经过过滤、干燥、热分解和粉碎后,得到纯度达到99.0%以上、粒度小于100纳米、比表面积30m2/g的锑掺杂氧化锡ATO纳米导电粉体,工艺简单、生产周期短、成本低。  相似文献   

Role of Nitric Oxide in Salmonella Infection     

Joya Ghosh 《Indian journal of clinical biochemistry : IJCB》2012,27(3):306-308

Nitric oxide (NO) derivative of l-arginine is an important signaling molecule that mediates a variety of essential physiological processes including vasodilation neurotransmission, and host cell defense. Many types of cells produce NO e.g., smooth muscle cell, endothelial cell, and leukocytes. Host defense functions are known for many bacterial and parasitic infections. In the present study we estimated the levels of serum NO in cases of salmonellosis and in controls. The nitric oxide was estimated by cadmium reduction method, Griess reaction. We observed that in controls the level of NO was (22 ± 2.06) μmol/l and in cases the level was (137.49 ± 29.84) μmol/l. The level of NO was significantly higher than controls (p < 0.001). The raised level of NO could be accounted for by host response to the infection. The host rapidly expresses iNOS, which in turn produces an excess amount of NO. Its cytotoxic effect is by its reactive nitrogen oxide derivative e.g., peroxynitrite. Apart from this it also has anti apoptotic functions. In future one can do follow up study of typhoid cases by bacterial culture.  相似文献   

氧化物陶瓷热电材料的物性研究     

孙建  韩庆邦 《科技通报》2012,28(2):55-57

氧化物陶瓷热电材料是一种有利于环保的新型能源转换材料.本文通过对氧化物陶瓷热电材料性能和影响因素地分析,特别是针对物性对热电性能的影响,结合实践提出了把氧化物热电材料做成多晶材料、材料的纳米结构复合化、搀杂修饰材料的能带结构等提高其性能的具体途径,用以指导具体的应用,希望具有启发意义.  相似文献   

部分还原的多层氧化石墨烯的制备和表征     

赵紫帅  张超  任璐璐  杨哲  朱弘  陈林  刘天西 《南阳师范学院学报》2010,9(12):41-44

采用改进的Hummers方法制备了多层氧化石墨烯（Few-layered Graphene Oxide,FGO）,并使用X-射线衍射（XRD）和原子力显微镜（AFM）对其结构进行了表征,提出了FGO的分子结构模型,通过AFM可知FGO主要由2~6层的单层氧化石墨烯组成.将FGO的水相悬浮液与含有油溶性还原剂的氯仿溶液进行混合反应,得到了部分还原的FGO（R-FGO）,AFM结果表明R-FGO由平整的类氧化石墨烯（GO）层和卷曲的类石墨烯（G）层构成,其可在水中分散,且具有一定的导电性.  相似文献   

胸苷酸合成酶和雌激素受体在乳腺癌中的表达意义及相关性     

黄景利  薄爱华  王新生  张晓丽  邵雪辉 《河北北方学院学报(医学版)》2010,27(2):3-7

目的:探讨胸苷酸合成酶(TS)和雌激素受体(ER)在乳腺癌中的表达及它们的相关性.方法:采用免疫组织化学SP法检测111例乳腺癌和38例乳腺腺瘤组织中TS和ER的表达情况.结果:乳腺腺瘤的TS和ER阳性率分别为10.53%(4/38)和36.84%(14/38),差异有显著性(P<0.05);乳腺癌病人中TS和ER的阳性率分别为31.53%(35/111)和40.54%(45/111),差异无显著性(P>0.05).乳腺癌中TS和ER的表达水平与患者年龄、发生部位、组织学类型、淋巴结转移相关性不明显(P>0.05).TS和ER在乳腺腺瘤组呈正向相关(r=0.077),而在乳腺癌组呈负向相关(r=-0.016).结论:TS在乳腺癌组表达率明显高于腺瘤(P<0.0 5);ER在良、恶性乳腺肿瘤内表达率差异无显著性(P>0.05).检测TS、ER对化疗药物选择有指导意义.  相似文献   

新型半导体光催化剂-Cu_2O制备和性能研究     

孙开莲  葛秀涛 《滁州学院学报》2010,12(2):55-58

半导体光催化氧化技术由于具有价廉、环境友好等优点,被认为在有机污水处理领域具有很好的应用前景。近十年来,P型半导体氧化亚铜以其无毒、价廉、太阳光响应及性能稳定等优点成为一种备受关注的新型光催化材料。本文综述了目前湿法制备氧化亚铜方法以及改性技术,同时介绍了氧化亚铜在光催化氧化处理水中有机污染物和分解水制备氢气两方面的应用研究现状,并对氧化亚铜今后的研究方向提出几点建议。  相似文献   

Imbalanced free radicals and antioxidant defense systems in schizophrenia： A comparative study   总被引：2，自引：0，他引：2  

Li HC  Chen QZ  Ma Y  Zhou JF 《Journal of Zhejiang University. Science. B》2006,7(12):981-986

Objective： To examine changes of blood oxidative-antiovidative level in schizophrenic patients and its relationship with clinical symptoms. Methods： Forty-six Chinese patients met DSM-IV （Diagnostic and Statistical Manual of Mental Disorders-iV） criteria for schizophrenia and fifty age- and sex-matched healthy controls were enrolled in the present study. Baseline psychiatric symptom severity was assessed with brief psychiatric rating scale, positive and negative syndrome scale on the blood draw day. Fresh blood samples were collected to measure levels of nitric oxide and lipid peroxide in plasma as well as activities of superoxide dismutase, catalase and glutathione peroxidase in red blood cells by spectrophotometric assays simultaneously. Results Comparison of the biochemical parameters indicated that the level of nitric oxide and lipid peroxide increased in patient group, which represented a positive correlation with positive scale scores; while the activities of three critical enzymes decreased and showed a negative linear correlation. Conclusion： This study showed that there are dysregulation of free radical metabolism and poor activities of the antioxidant defense systems in schizophrenic patients. Excess free radicals formation may play a critical role in the etiology of schizophrenia. Using antioxidants might be an effective therapeutic approach to partially alleviate or prevent the symptoms of schizophrenia.  相似文献   

低负荷加压训练改善自发性高血压大鼠的血压效果及机制研究     

谭朝文  赵彦  俞莹莹  马晓缓  郑玉婵 《体育科学》2020,(3):46-53,63

目的:探究低负荷加压训练对自发性高血压大鼠的降压效果及其作用机制。方法:选取4周龄雄性自发性高血压大鼠,随机分为对照组(高血压安静组)、低负荷训练组、低负荷加压训练组和高负荷训练组。低负荷训练组进行35%~55%1RM递进式低负荷爬梯训练,低负荷加压训练组进行30%~40%血流受限结合35%~55%1RM递进式低负荷爬梯训练,高负荷训练组进行55%~75%1RM递进式高负荷爬梯训练,训练后测定血压、血液中内皮素-1、血管内皮生长因子、一氧化氮合成酶的表达和心肌组织中内皮型一氧化氮合成酶的表达。结果:1)与对照组、高负荷训练组相比,低负荷加压训练组收缩压、舒张压显著下降(P<0.05);与低负荷训练组相比,低负荷加压训练组舒张压显著下降(P<0.05)。2)与对照组相比,低负荷加压训练组血液中内皮素-1表达显著下调(P<0.05),血管内皮生长因子和一氧化氮合成酶表达显著上调(P<0.05);3)与对照组相比,低负荷加压训练组心肌中内皮型一氧化氮合成酶表达显著上调(P<0.05);4)在低负荷加压训练组中,收缩压与内皮素-1呈正相关,相关性分析具有统计学意义(P<0.05);收缩压与一氧化氮合成酶、血管内皮生长因子、内皮型一氧化氮合成酶均呈负相关,相关性分析具有统计学意义(P<0.05)。结论:1)低负荷加压训练降压效果优于高负荷训练;2)低负荷加压训练能够通过下调血液中内皮素-1的表达,上调血液中血管内皮生长因子和一氧化氮合成酶的表达,同时上调心肌中内皮型一氧化氮合成酶表达,改善内皮细胞功能,达到降压的效果。  相似文献   

二元氧化物酸碱性的模式识别研究   总被引：1，自引：0，他引：1  

吴启勋 《青海师专学报》1997,17(2):60-63

用化学键参数－模式识别化学计量学方法研究了二元氧化物的酸碱性，基于模糊关系建立的数学模型，考虑了影响酸碱性的多种因素，可用于酸碱的分类，预报和标度。  相似文献   

SOFC temperature evaluation based on an adaptive fuzzy controller     

Xiao-juan Wu  Xin-jian Zhu  Guang-yi Cao  Heng-yong Tu 《浙江大学学报(A卷英文版)》2008,9(5):688-694

The operating temperature of a solid oxide fuel cell （SOFC） stack is a very important parameter to be controlled, which impacts the performance of the SOFC due to thermal cycling. In this paper, an adaptive fuzzy control method based on an affine nonlinear temperature model is developed to control the temperature of the SOFC within a specified range. Fuzzy logic systems are used to approximate nonlinear functions in the SOFC system and an adaptive technique is employed to construct the controller. Compared with the traditional fuzzy and proportion-integral-derivative （PID） control, the simulation results show that the designed adaptive fuzzy control method performed much better. So it is feasible to build an adaptive fuzzy controller for temperature control of the SOFC.  相似文献