15 research outputs found

    肌萎缩侧索硬化症SOD1基因突变特点

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    【目的】 探讨中国南方人群肌萎缩侧索硬化症铜锌超氧化物岐化酶(CulZnsuperoxidedismutase;SOD1)基因突变的特点。【方法】 采用SOD1基因的5对引物对4个家系的15例家族性肌萎缩侧索硬化症(FALS)患者、56例散发性肌萎缩侧索硬化症(SALS)患者和46例正常对照DNA进行PCR扩增,重复三次应用单链构象多态性方法分析各外显子的多态性。【结果】 SOD1基因的5个外显子未发现异常泳动。【结论】 中国南方人群肌萎缩侧索硬化症患者可能不存在SOD1基因第1-5号外显子突变或突变率极低,可能存在其他位点的基因突变

    叠层陶瓷增韧机制

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    用扫描电镜、Questar长焦显微监测系统等仪器实时观察siC/BN叠层陶瓷缺口试样在三点弯曲加载时裂纹发生、发展直至破坏的全过程。试验结果表明主层与夹层间的界面结合强度是影响层状陶瓷韧性的重要因素。并讨论了材料强韧化的实现途径

    阿尔茨海默病患者载脂蛋白 E 等位基因的多态性

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    目的: 探讨载脂蛋白 E( apoE)等位基因多态性在散发性阿尔茨海默病( SAD)发病机制中的作用。方法: 应用聚合酶 链反应—限制性片段长度多态性( PCR -RFLP)方法检测 68 名 SAD 患者和 66 名正常老年人的 apoE等位基因多态性分布。结果: SAD 组 apoE2 等位基因频率明显低于对照组(P 0. 05)。 结论: apoE2 基因可能具有保护SAD 发病的作用; 不支持 apoE4 是中国人 SAD 发病高危因素的结论

    GaAs中过渡族杂质Pd和Zr有关的深中心

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    采用结谱、光荧光等技术对Pd和Zt在GaAs中的光学和电学性质进行了研究.在GaAs:Pd中观测到三个能级,分别位于导带下0.4eV、0.60eV和价带上0.69eV.在GaAs:Zr中也观测到三个能级,分别位于导带下0.43eV和介带上0.32eV和0.55eV.基于深中心所表现出的Poole-Frenkel效应,讨论了一些中心对应的荷电态,对它们的俘获和对光致发光的影响也作了研究,结果表明:Pd和Zr在GaAs中均不是有效的复合中心

    Energy characteristics of Casuarina equisetifolia ecosystem on coastal sand in Dongshan County,Fujian Province

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    对福建东山县海岸带红壤性风积沙土与均一性风积沙土木麻黄群落的生物量、生产力、各组分干重热值、去灰分热值及能量分布与结构特征进行了研究.结果表明,红壤性风积沙土木麻黄群落的现存生物量和能量分别为15681.84g·m-2和317795.31kJ·m-2;均一性风积沙土木麻黄群落现存生物量和能量分别为5129.87g-1·m-2和105751.50kJ·m-2;红壤性风积沙土的木麻黄群落各组分热值范围为19.84~21.70kJ·g-1,各组分能量在群落中所占比例为:干(38.09%)>枝(19.48%)>根(17.09%)>叶(16.86%)>皮(6.83%)>枯枝(0.88%)>果(0.77%),凋落物能量归还量为9070.47kJ·m-2·yr-1,群落能量的净固定量为31298.70kJ·m-2·yr-1;均一性风积沙土木麻黄群落各组分热值在19.98~21.39kJ·g-1,其中枯枝热值最高,根最低;各组分能量在群落中所占比例为:干(46.93%)>根(16.44%)>枝(13.92%)>枯枝(12.28%)>皮(5.87%)>叶(3.90%)>果(0.66%),凋落物能量归还量为2061.77kJ·m-2·yr-1,群落能量净固定量为12662.82kJ·m-2·yr-1.红壤性风积沙土上的木麻黄群落现存生物量和能量现存量均要高于均一性风积沙土,原因是红壤性风积沙土的沙土层薄(100cm)的均一性风积沙土.The study on the energy characteristics of Casurina equisetifolia community on red earth eolian sandy soil and homogeneous eolian sandy soil in Dongshan County of Fujian Province showed that the standing biomass and energy of Casurina equisetifolia community were 15 681.84 g·m~ -2 and 317 795.31 kJ·m~ -2 on red earth eolian sandy soil,and 5 129.87 g·m~ -2 and 10 575.50 kJ·m~ -2 on homogeneous eolian sandy soil,respectively.On homogeneous eolian sandy soil,the gross caloric value of the community ranged from 19.98 kJ·g~ -1 to 21.39 kJ·g~ -1,of which,dead branch was the highest while root was the lowest,and its percentage was 46.93%(truck)>16.44%(root)>13.92% (branch)> 12.28%(dead branch)>5.87%(bark)>3.90%(leaf)> 0.66%(fruit).The return amount of litter was 2 061.77 kJ·m~ -2·yr~ -1,and the net energy productivity was 12662.82 kJ·m~ -2·yr~ -1.On red earth eolian sandy soil,the gross caloric value was 19.84~21.70 kJ·g~ -1,among which,leaf was the highest while root was the lowest,and its percentage was 38.09%(truck)>19.48%(branch)>17.09%(root)>16.86%(leaf)>6.83%(bark)>0.88%(dead branch)>0.77%(fruit).The returned amount of litter was 9 070.47 kJ·m~ -2·yr~ -1,and the net energy productivity was 31 298.70 kJ·m~ -2·yr~ -1.The standing biomass and energy of Casurina equisetifolia community were higher on red earth eolian sandy soil than on homogeneous eolian sandy soil, mainly because red earth eolian sandy soil had a thinner sandy layer(<20cm) and a stronger nutrient and water supplying ability.国家“十五”科技攻关项目(2004BA516A1315);; 国家林业局南方山地用材林培育实验室资助项目

    Species composition and age structure of fish in the Daya Bay in spring and autumn

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    2006年4月和9月对大亚湾海域通过拖网和流刺网捕获的鱼类进行初步调查.结果表明,渔获物中出现18目76科135属200种鱼类,其中软骨鱼纲4目5科5属6种,占调查鱼类总种数的3.0%;硬骨鱼纲14目71科130属194种,占调查鱼类总种数的97.0%.根据其适温类型可分为暖水性种、暖温性种和冷温性种,其中暖水性鱼类有183种,占总种数的91.5%;暖温性鱼类有16种,占总种数的8.0%;冷温性鱼类仅有1种,占总种数的0.5%.渔获物中底层和近底层鱼类占多数,其中,底层鱼类共有74种,占总种数的37.0%;近底层鱼类共有68种,占总种数的34.0%;中上层鱼类共有45种,占总种数的22.5%;岩礁鱼类有13种,占总种数的6.5%.大亚湾鱼类的年龄普遍偏低,以1 A龄鱼为主.与相邻海区鱼类区系特征比较,大亚湾海域具有我国热带和亚热带性海湾的鱼类区系特征.An investigation of fish in Daya Bay was conducted in April and September 2006 using a trawl and drift net.The results showed that there were 200 species of fish belonging to 135 genera in 76 families of 18 orders.of these,6 species in 5 genera,5 families,and 4 orders belonged to Chondrichthyes,and 194 species in 130 genera,71 families,and 14 orders belonged to Osteichthyes,accounting for 3.0% and 97.0%,respectively.Based on the temperature nature of the fauna,the fish in Daya Bay may be grouped into three types,with warm-water species,warm-temperature species and cold-temperature species accounting for 91.5%(183 species),8.0%(16 species) and 0.5%(one species),respectively.According to the diversity of the habitable environment,demersal fishes were the most abundant,accounting for 37.0%(74 species),followed by near demersal and pelagic fish,accounting for 34.0%(68 species) and 22.5%(45 species),respectively,and reef fish only accounted for 6.5%(13 species).The age structure of the fish primarily consisted of one age class in Daya Bay.When compared with other sea areas around Daya Bay,most species of ichthyofauna in the South China Sea bear tropical and subtropical characteristics.广东省科技计划资助项目(2004A30501002

    骨髓干细胞移植后 mdx 鼠腓肠肌病理及 Dystrophin 的表达变化

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    【目的】研究骨髓干细胞移植后 mdx 鼠腓肠肌组织病理变化及 dystrophin 的动态表达变化。【方法】7~9 周 mdx 鼠 20 只平均分为 4 组, 放疗后移植 1.2×107 个 /只同种异基因全骨髓干细胞, 于移植后 4 周、8周、12 周及 16 周应用 HE 染色观察细胞形态 及 核中心移位 ( CNF) , 免 疫组化及 Western blot 方法检测dystrophin 表达变化, C57 鼠和未治疗 mdx 鼠各 5 只作阳性和阴性对照。【结果】C57 鼠腓肠肌横切面可见肌细胞大小形态基本一致, 无核中移现象。各细胞移植治疗组和对照组 mdx 鼠均有大量的炎细胞浸润, 核中心移位明显。未治疗 mdx 鼠 CNF 最高, 可达 70%左右, 移植后 4 周、12 周和 16 周, CNF 比例分别为 55%、50%和 44%。免疫荧光结果 C57 鼠肌膜呈完整的网状绿色荧光, mdx 鼠肌膜基本未见绿色荧光; 移植后 4 周肌膜 dystrophin阳性纤维数大约占细胞总数的 1%, 随时间延长表达渐渐增多, 8 周、12 周和 16 周时阳性细胞数分别占细胞总数的 5%、10%和 15%。Western blot 结果 mdx 鼠无 dystrophin 的表达, 野生型 C57 鼠表达量最多 , 移植后 4 周mdx 鼠仅见微弱表达, 随时间延长表达量渐增, 移植后 16 周表达量较移植 8 周明显增加。【结论】骨髓干细胞移植后 mdx 鼠腓肠肌 CNF 随移植时间延长逐渐减少, dystrophin 的表达随时间延长增多, 提示骨髓干细胞移 植后长久持续参与受损骨骼肌的修复与再生
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