Retinol\|binding protein(RBP)is the transport protein of vitamin A and is one of the members in the family of proteins which may all bind small hydrophobic molecules.In order to study the structure\|function relations...Retinol\|binding protein(RBP)is the transport protein of vitamin A and is one of the members in the family of proteins which may all bind small hydrophobic molecules.In order to study the structure\|function relationship of RBP,the plasmid pET3a\|RBP was constructed,and RBP was expressed in E.coli Bl21(DE3)successfully.The expressed protein,with molecular weight of about 21 kD,was about 36.95 percent of the total bacteria protein as detected by SDS\|PAGE and densitometry analysis.Then the production was confirmed by probing Western blot of E.coli lysate separated on SDS\|PAGE with antisera against hRBP.In succession,the fluorescence enhancement properties and shift in absorption spectrum had also confirmed the production’s functional characteristics.It could bind ROH in ratio of 1∶1 and K d=1.5×10 -7 mol/L.展开更多
In this paper the grid data of total ozone mapping spectrograph (TOMS) installed on Nimbus 7 satellite (1978 to 1994) was used and the spatial and temporal distribution of total ozone over China was analyzed. The res...In this paper the grid data of total ozone mapping spectrograph (TOMS) installed on Nimbus 7 satellite (1978 to 1994) was used and the spatial and temporal distribution of total ozone over China was analyzed. The research indicates that the Qinghai Tibet Plateau destroyed the latitudinal distribution of total ozone of China and the low value closed center emerged over Qinghai Tibet Plateau. Long time change trends of seasonal total ozone of Qinghai Tibet Plateau are provided. It shows that the most obvious decrease of total ozone occurs in winter (Jan.), then in summer (Jul.), the relevant slow change occurs in autumn (Oct.) and spring (Apr.).展开更多
文摘Retinol\|binding protein(RBP)is the transport protein of vitamin A and is one of the members in the family of proteins which may all bind small hydrophobic molecules.In order to study the structure\|function relationship of RBP,the plasmid pET3a\|RBP was constructed,and RBP was expressed in E.coli Bl21(DE3)successfully.The expressed protein,with molecular weight of about 21 kD,was about 36.95 percent of the total bacteria protein as detected by SDS\|PAGE and densitometry analysis.Then the production was confirmed by probing Western blot of E.coli lysate separated on SDS\|PAGE with antisera against hRBP.In succession,the fluorescence enhancement properties and shift in absorption spectrum had also confirmed the production’s functional characteristics.It could bind ROH in ratio of 1∶1 and K d=1.5×10 -7 mol/L.
文摘In this paper the grid data of total ozone mapping spectrograph (TOMS) installed on Nimbus 7 satellite (1978 to 1994) was used and the spatial and temporal distribution of total ozone over China was analyzed. The research indicates that the Qinghai Tibet Plateau destroyed the latitudinal distribution of total ozone of China and the low value closed center emerged over Qinghai Tibet Plateau. Long time change trends of seasonal total ozone of Qinghai Tibet Plateau are provided. It shows that the most obvious decrease of total ozone occurs in winter (Jan.), then in summer (Jul.), the relevant slow change occurs in autumn (Oct.) and spring (Apr.).
