目的·建立一种定量检测唐氏综合征嵌合体小鼠各脏器嵌合情况的方法,并初步探究其不同器官中的嵌合规律。方法·分别针对唐氏综合征模型Tc1小鼠细胞(三体细胞)内人源21号染色体(记为Hsa21)上SIM2基因和小鼠15号染色体(记为Mmu15...目的·建立一种定量检测唐氏综合征嵌合体小鼠各脏器嵌合情况的方法,并初步探究其不同器官中的嵌合规律。方法·分别针对唐氏综合征模型Tc1小鼠细胞(三体细胞)内人源21号染色体(记为Hsa21)上SIM2基因和小鼠15号染色体(记为Mmu15)上Derl1基因设计引物,采用实时荧光定量PCR(quantitative real time PCR,qPCR)技术对SIM2和Derl1进行检测来反映Hsa21和Mmu15的比例,并以此计算嵌合体小鼠各器官中Tc1小鼠细胞的嵌合占比。结果·所鉴定的小鼠中有3只为嵌合体小鼠。该3只小鼠心脏组织Tc1小鼠细胞嵌合率分别为8.98%、21.71%和57.70%,小脑组织分别为5.62%、20.17%和40.43%,大脑组织分别为8.48%、15.35%和20.45%,肝脏组织分别为2.66%、6.50%和16.84%,脾脏组织分别为1.73%、3.80%和11.80%。结论·基于qPCR技术对不同染色体上的基因进行定量分析的方法可用于唐氏综合征嵌合体小鼠中三体细胞嵌合率的定量检测。Tc1小鼠细胞在嵌合体小鼠的心脏、小脑、大脑、肝脏、脾脏均可发生嵌合,心脏组织的嵌合率偏向最高。展开更多
GmPHR1 from soybean （Glycine max） was isolated and characterized. This novel homolog of the AtPHR1 transcription factor confers tolerance to inorganic phosphate （Pi）-starvation. The gene is 2 751 bp long, with an ...GmPHR1 from soybean （Glycine max） was isolated and characterized. This novel homolog of the AtPHR1 transcription factor confers tolerance to inorganic phosphate （Pi）-starvation. The gene is 2 751 bp long, with an 819-bp open reading frame and ifve introns. Analysis of transcription activity in yeast revealed that the full-length GmPHR1 and its C-terminal activate the reporter genes for His, Ade and Ura, suggesting that the C-terminal peptide functions as a transcriptional activator. Quantitative real-time PCR indicated that patterns of GmPHR1 expression differed. For example, under low-Pi stress, this gene was quickly induced in the tolerant JD11 after 0.5 h, with expression then decreasing slowly before peaking at 12-24 h. By contrast, induction in the sensitive Niumaohuang （NMH） was slow, peaking at 6 h before decreasing quickly at 9 h. GmPHR1 showed sub-cellular localization in the nuclei of onion epidermal cells and Arabidopsis roots. Growth parameters in wild-type （WT） Arabidopsis plants as well as in overexpression （OE） transgenic lines were examined. Under low-Pi conditions, values for shoot, root and whole-plant dry weights, root to shoot ratios, and lengths of primary roots were signiifcantly greater in OE lines than in the WT. These data demonstrate that GmPHR1 has an important role in conferring tolerance to phosphate starvation.展开更多
In order to develop and improve the fixed point theorems in cone metric spaces, some new fixed point theorems are presented for two mappings in cone metric spaces which satisfy contractive conditions, where the cone i...In order to develop and improve the fixed point theorems in cone metric spaces, some new fixed point theorems are presented for two mappings in cone metric spaces which satisfy contractive conditions, where the cone is not necessarily normal. Our results generalize fixed point theorems of Abbas, Jungck and Stojan Radenovi in cone metric spaces.展开更多
文摘目的·建立一种定量检测唐氏综合征嵌合体小鼠各脏器嵌合情况的方法,并初步探究其不同器官中的嵌合规律。方法·分别针对唐氏综合征模型Tc1小鼠细胞(三体细胞)内人源21号染色体(记为Hsa21)上SIM2基因和小鼠15号染色体(记为Mmu15)上Derl1基因设计引物,采用实时荧光定量PCR(quantitative real time PCR,qPCR)技术对SIM2和Derl1进行检测来反映Hsa21和Mmu15的比例,并以此计算嵌合体小鼠各器官中Tc1小鼠细胞的嵌合占比。结果·所鉴定的小鼠中有3只为嵌合体小鼠。该3只小鼠心脏组织Tc1小鼠细胞嵌合率分别为8.98%、21.71%和57.70%,小脑组织分别为5.62%、20.17%和40.43%,大脑组织分别为8.48%、15.35%和20.45%,肝脏组织分别为2.66%、6.50%和16.84%,脾脏组织分别为1.73%、3.80%和11.80%。结论·基于qPCR技术对不同染色体上的基因进行定量分析的方法可用于唐氏综合征嵌合体小鼠中三体细胞嵌合率的定量检测。Tc1小鼠细胞在嵌合体小鼠的心脏、小脑、大脑、肝脏、脾脏均可发生嵌合,心脏组织的嵌合率偏向最高。
基金supported by the National Natural Science Foundation of China (31071441, 31401405)the National Transgenic Major Project of China (2014ZX0800404B)
文摘GmPHR1 from soybean （Glycine max） was isolated and characterized. This novel homolog of the AtPHR1 transcription factor confers tolerance to inorganic phosphate （Pi）-starvation. The gene is 2 751 bp long, with an 819-bp open reading frame and ifve introns. Analysis of transcription activity in yeast revealed that the full-length GmPHR1 and its C-terminal activate the reporter genes for His, Ade and Ura, suggesting that the C-terminal peptide functions as a transcriptional activator. Quantitative real-time PCR indicated that patterns of GmPHR1 expression differed. For example, under low-Pi stress, this gene was quickly induced in the tolerant JD11 after 0.5 h, with expression then decreasing slowly before peaking at 12-24 h. By contrast, induction in the sensitive Niumaohuang （NMH） was slow, peaking at 6 h before decreasing quickly at 9 h. GmPHR1 showed sub-cellular localization in the nuclei of onion epidermal cells and Arabidopsis roots. Growth parameters in wild-type （WT） Arabidopsis plants as well as in overexpression （OE） transgenic lines were examined. Under low-Pi conditions, values for shoot, root and whole-plant dry weights, root to shoot ratios, and lengths of primary roots were signiifcantly greater in OE lines than in the WT. These data demonstrate that GmPHR1 has an important role in conferring tolerance to phosphate starvation.
基金Foundation item： Supported by the NNSF of China（10771212） Supported by the Natural Science Foundation of Xuzhou Normal University（09KLB03）
文摘In order to develop and improve the fixed point theorems in cone metric spaces, some new fixed point theorems are presented for two mappings in cone metric spaces which satisfy contractive conditions, where the cone is not necessarily normal. Our results generalize fixed point theorems of Abbas, Jungck and Stojan Radenovi in cone metric spaces.
