目的探讨1个罕见β地贫基因CD37(TGG→TAG)突变复合ɑ地贫家系的分子遗传学及血液学表型特征。方法采集该家系两代成员外周全血样本,并进行血液学表型以及红细胞参数和血红蛋白(Hb)分析。采用跨越断裂点聚合酶链反应(Gap-PCR)方法、PCR...目的探讨1个罕见β地贫基因CD37(TGG→TAG)突变复合ɑ地贫家系的分子遗传学及血液学表型特征。方法采集该家系两代成员外周全血样本,并进行血液学表型以及红细胞参数和血红蛋白(Hb)分析。采用跨越断裂点聚合酶链反应(Gap-PCR)方法、PCR结合反向点杂交(PCR-RDB)法以及DNA测序方法对家系成员外周全血样本进行常见的地贫基因类型检测和β-珠蛋白基因序列分析。结果该家系成员中先证者及其父亲、大姐平均红细胞体积(MCV)分别为55.4 f L、67.8 f L和63.0 f L,平均红细胞血红蛋白量(MCH)分别为17.5 pg、21.0 pg和19.5 pg,血红蛋白A2(Hb A2)分别为5.9%、6.2%、4.9%;其母亲和二姐的MCV和MCH降低,但Hb分析结果均正常。基因分析结果示:先证者携带罕见β地中海贫血CD37(TGG→TAG)突变,其父亲和大姐携带CD37(TGG→TAG)突变复合-ɑ3.7杂合缺失,二姐携带-ɑ3.7杂合缺失,母亲未见异常。结论罕见β地贫基因CD37(TGG→TAG)突变复合-ɑ3.7杂合缺失的血液学表型与单纯CD37(TGG→TAG)突变杂合子类似,表现为轻型β地贫特征。展开更多
The effects of glass flit on the sintering and electric properties of PMN-PT textured ceramics were investigated. The glass frits, including PbO, Bi2O3 and ZnO, were selected since liquid phase sintering lowered the P...The effects of glass flit on the sintering and electric properties of PMN-PT textured ceramics were investigated. The glass frits, including PbO, Bi2O3 and ZnO, were selected since liquid phase sintering lowered the PMN-PT sintering temperature. The piezoelectric properties of PMN-PT ceramics with glass frit addition are strongly dependent on the densification. The addition of glass frits into PMN-PT matrix reduced the sintering temperature to 1 100℃ instead of 1 150 ℃ for samples without glass. The piezoelectric coefficients (d33) of PMN-PT textured ceramics achieved 568 pc/N with 1 wt% excess PbO.展开更多
近日,中国通信标准化协会(CCSA)与绿色网格(The Green Grid)在北京联合签署了合作谅解备忘录。根据此合作谅解备忘录,CCSA与TGG建立了定期的交流与合作机制。有助于推动CCSA在相关方面的标准研究工作,在促进中国数据中心绿色发...近日,中国通信标准化协会(CCSA)与绿色网格(The Green Grid)在北京联合签署了合作谅解备忘录。根据此合作谅解备忘录,CCSA与TGG建立了定期的交流与合作机制。有助于推动CCSA在相关方面的标准研究工作,在促进中国数据中心绿色发展方面起到更加重要的作用。TGG授权CCSA在中国推广TGG相关标准,CCSA可参照TGG标准制定中国的国家标准或行业标准,CCSA还可向TGG提交标准建议和申请,将中国国内行业的需求输入到TGG。展开更多
文摘目的探讨1个罕见β地贫基因CD37(TGG→TAG)突变复合ɑ地贫家系的分子遗传学及血液学表型特征。方法采集该家系两代成员外周全血样本,并进行血液学表型以及红细胞参数和血红蛋白(Hb)分析。采用跨越断裂点聚合酶链反应(Gap-PCR)方法、PCR结合反向点杂交(PCR-RDB)法以及DNA测序方法对家系成员外周全血样本进行常见的地贫基因类型检测和β-珠蛋白基因序列分析。结果该家系成员中先证者及其父亲、大姐平均红细胞体积(MCV)分别为55.4 f L、67.8 f L和63.0 f L,平均红细胞血红蛋白量(MCH)分别为17.5 pg、21.0 pg和19.5 pg,血红蛋白A2(Hb A2)分别为5.9%、6.2%、4.9%;其母亲和二姐的MCV和MCH降低,但Hb分析结果均正常。基因分析结果示:先证者携带罕见β地中海贫血CD37(TGG→TAG)突变,其父亲和大姐携带CD37(TGG→TAG)突变复合-ɑ3.7杂合缺失,二姐携带-ɑ3.7杂合缺失,母亲未见异常。结论罕见β地贫基因CD37(TGG→TAG)突变复合-ɑ3.7杂合缺失的血液学表型与单纯CD37(TGG→TAG)突变杂合子类似,表现为轻型β地贫特征。
基金Supported by the National Natural Science Foundation of China (No.50502027)the 973 Project (No. 2002CB613303)
文摘The effects of glass flit on the sintering and electric properties of PMN-PT textured ceramics were investigated. The glass frits, including PbO, Bi2O3 and ZnO, were selected since liquid phase sintering lowered the PMN-PT sintering temperature. The piezoelectric properties of PMN-PT ceramics with glass frit addition are strongly dependent on the densification. The addition of glass frits into PMN-PT matrix reduced the sintering temperature to 1 100℃ instead of 1 150 ℃ for samples without glass. The piezoelectric coefficients (d33) of PMN-PT textured ceramics achieved 568 pc/N with 1 wt% excess PbO.
文摘近日,中国通信标准化协会(CCSA)与绿色网格(The Green Grid)在北京联合签署了合作谅解备忘录。根据此合作谅解备忘录,CCSA与TGG建立了定期的交流与合作机制。有助于推动CCSA在相关方面的标准研究工作,在促进中国数据中心绿色发展方面起到更加重要的作用。TGG授权CCSA在中国推广TGG相关标准,CCSA可参照TGG标准制定中国的国家标准或行业标准,CCSA还可向TGG提交标准建议和申请,将中国国内行业的需求输入到TGG。