Vertical profiles of the total organic carbon(TOC), total nitrogen(TN) , phosphorus, susceptibilities, elements and partical size were analyzed in a sh ort 137Cs-dated sediment core collected from Honghu Lake, China. ...Vertical profiles of the total organic carbon(TOC), total nitrogen(TN) , phosphorus, susceptibilities, elements and partical size were analyzed in a sh ort 137Cs-dated sediment core collected from Honghu Lake, China. The average sed imentation rate was 1.55 mm/a. The results indicated that trophic status of Hong hu Lake in the historical period had experienced three stages. Before 1840 the l ake was characterized with lower productivity, TOC was less than 9.92 g/kg; TN w as 0.902 to 1.24 g/kg. During about 1840—1950, population increased quickly, th ere was an obvious change in TOC with an average of 13.0 g/kg. Since 1950, human impacts have accelerated the lake eutrophication and nutrients enriched in the sediment with TOC of 21.7 to 93.1 g/kg, TN of 1.77 to 8.78 g/kg. The heavy metal concentration profiles presented similar distribution trends except Pb and Mn. The results from elements analyses indicated that Honghu Lake had not been pollu ted by heavy metals except lead.展开更多
The extra small virus (XSV) is a satellite virus associated with Macrobrachium rosenbergii nodavirus (MrNV) and its genome consists of two overlapping ORFs, CP17 and CP16. Here we demonstrate that CP16 is expressed fr...The extra small virus (XSV) is a satellite virus associated with Macrobrachium rosenbergii nodavirus (MrNV) and its genome consists of two overlapping ORFs, CP17 and CP16. Here we demonstrate that CP16 is expressed from the second AUG of the CP17 gene and is not a proteinase cleavage result of CP17. We further expressed CP17 and several truncated CP17s (in which the N-or C-terminus or both was deleted), respectively, in Escherichia coli. Except for the recombinant plasmid CP17?C10, all recombinant plasmids expressed soluble protein which assembled into virus-like particles (VLPs), suggesting that the C-terminus is important for VLP formation.展开更多
Two luminescent hetero-trinuclear complexes [Pt2Cu(μ-dpppy)2(C≡CC6H4R-4)4](Cl O4)(R = H,1;R = CH3,2;dpppy = 2,6-bis(diphenylphosphino)pyridine) have been synthesized and characterized by elemental analyses,ESI-MS,1H...Two luminescent hetero-trinuclear complexes [Pt2Cu(μ-dpppy)2(C≡CC6H4R-4)4](Cl O4)(R = H,1;R = CH3,2;dpppy = 2,6-bis(diphenylphosphino)pyridine) have been synthesized and characterized by elemental analyses,ESI-MS,1H and 31P{1H} NMR spectroscopy,and X-ray crystallography for 2.Their photophysical properties in the solid state and in solutions at room temperature and in frozen glasses at 77 K were studied.Both complexes 1 and 2 show strong orange-red emission in the solid state at room temperature and in frozen glasses at 77 K,and weak emission in solutions.展开更多
Adsorption of 4-(4-nitrophenylazo)-1-naphthol (NPAN), an azobenzene derivative, on Au(111) has been in-vestigated in aqueous HClO4 solution by using the cyclic voltammetry and scanning tunneling microscopy (STM). The ...Adsorption of 4-(4-nitrophenylazo)-1-naphthol (NPAN), an azobenzene derivative, on Au(111) has been in-vestigated in aqueous HClO4 solution by using the cyclic voltammetry and scanning tunneling microscopy (STM). The molecule is found to form a stable monolayer on the elec-trode with a (6×4) structure relative to the underlying Au(111) lattice. Cyclic voltammograms show that the redox reactions occurring on the electrode are retarded by the formation of the monolayer. A structural model is proposed for the two-dimensional adlayer.展开更多
Annual accumulation records covering 1935 to 2004 were reconstructed using Geladaindong ice core in the source of Yangtze River. A significant positive correlation between annual accumulation and precipitation from ne...Annual accumulation records covering 1935 to 2004 were reconstructed using Geladaindong ice core in the source of Yangtze River. A significant positive correlation between annual accumulation and precipitation from nearby meteorological stations was found, suggesting ice core accumulation could be taken as a precipitation proxy in the region. In the past 70 years, precipitation in the Geladaindong region was low from 1930s to early 1960s, and the lowest value occurred in the later 1950s. Since 1960s, precipitation increased dramatically and reached the maximum around 1980s, then decreased slightly in 1990s. By using Mann-Kendall rank statistical test method, a change point for precipitation was de- termined in 1967. Analysis of the atmospheric circulation over the Tibetan Plateau suggested that, compared with the southwest wind during the low precipitation period (before 1967), it extended about 2 latitudes northward during high precipitation period (after 1967). Moreover, during the high precipita- tion, the trough over the Bal Karshi Lake was also enhanced, and both the meridional wind and vapor transporting displayed a remarkable aggrandizement.展开更多
文摘Vertical profiles of the total organic carbon(TOC), total nitrogen(TN) , phosphorus, susceptibilities, elements and partical size were analyzed in a sh ort 137Cs-dated sediment core collected from Honghu Lake, China. The average sed imentation rate was 1.55 mm/a. The results indicated that trophic status of Hong hu Lake in the historical period had experienced three stages. Before 1840 the l ake was characterized with lower productivity, TOC was less than 9.92 g/kg; TN w as 0.902 to 1.24 g/kg. During about 1840—1950, population increased quickly, th ere was an obvious change in TOC with an average of 13.0 g/kg. Since 1950, human impacts have accelerated the lake eutrophication and nutrients enriched in the sediment with TOC of 21.7 to 93.1 g/kg, TN of 1.77 to 8.78 g/kg. The heavy metal concentration profiles presented similar distribution trends except Pb and Mn. The results from elements analyses indicated that Honghu Lake had not been pollu ted by heavy metals except lead.
基金National Natural Science Foundation of China (30370057).
文摘The extra small virus (XSV) is a satellite virus associated with Macrobrachium rosenbergii nodavirus (MrNV) and its genome consists of two overlapping ORFs, CP17 and CP16. Here we demonstrate that CP16 is expressed from the second AUG of the CP17 gene and is not a proteinase cleavage result of CP17. We further expressed CP17 and several truncated CP17s (in which the N-or C-terminus or both was deleted), respectively, in Escherichia coli. Except for the recombinant plasmid CP17?C10, all recombinant plasmids expressed soluble protein which assembled into virus-like particles (VLPs), suggesting that the C-terminus is important for VLP formation.
基金Supported by NSF of Fujian Province(No.2014J01046)Key Science Project(type A)of the Fujian Provincial Department of Education,China(No.JA12021)the NSF for Fostering Talents in Basic Research of China(No.J1103303)
文摘Two luminescent hetero-trinuclear complexes [Pt2Cu(μ-dpppy)2(C≡CC6H4R-4)4](Cl O4)(R = H,1;R = CH3,2;dpppy = 2,6-bis(diphenylphosphino)pyridine) have been synthesized and characterized by elemental analyses,ESI-MS,1H and 31P{1H} NMR spectroscopy,and X-ray crystallography for 2.Their photophysical properties in the solid state and in solutions at room temperature and in frozen glasses at 77 K were studied.Both complexes 1 and 2 show strong orange-red emission in the solid state at room temperature and in frozen glasses at 77 K,and weak emission in solutions.
文摘Adsorption of 4-(4-nitrophenylazo)-1-naphthol (NPAN), an azobenzene derivative, on Au(111) has been in-vestigated in aqueous HClO4 solution by using the cyclic voltammetry and scanning tunneling microscopy (STM). The molecule is found to form a stable monolayer on the elec-trode with a (6×4) structure relative to the underlying Au(111) lattice. Cyclic voltammograms show that the redox reactions occurring on the electrode are retarded by the formation of the monolayer. A structural model is proposed for the two-dimensional adlayer.
基金financially supported by the National Nature Sciences foundation of China(No.20801013)the Innovation Foundation for Young Technological Talents of Fujian Province(No.2007F3050)+1 种基金the projectsponsored by SRF for ROCS,SEM(No.LXKQ0830)Fuzhou University(No.XRC-0723)
基金Supported by the National Natural Science Foundation of China (Grant No. 40401054 and 40121101)the National Basic Research Program of China (Grant No. 2005CB422004)+1 种基金the "Talent Project" and Innovation Project of Chinese Academy of Sciences (Grant Nos. KZCX3-SW-339 and 334)Dean Foundation of CAS
文摘Annual accumulation records covering 1935 to 2004 were reconstructed using Geladaindong ice core in the source of Yangtze River. A significant positive correlation between annual accumulation and precipitation from nearby meteorological stations was found, suggesting ice core accumulation could be taken as a precipitation proxy in the region. In the past 70 years, precipitation in the Geladaindong region was low from 1930s to early 1960s, and the lowest value occurred in the later 1950s. Since 1960s, precipitation increased dramatically and reached the maximum around 1980s, then decreased slightly in 1990s. By using Mann-Kendall rank statistical test method, a change point for precipitation was de- termined in 1967. Analysis of the atmospheric circulation over the Tibetan Plateau suggested that, compared with the southwest wind during the low precipitation period (before 1967), it extended about 2 latitudes northward during high precipitation period (after 1967). Moreover, during the high precipita- tion, the trough over the Bal Karshi Lake was also enhanced, and both the meridional wind and vapor transporting displayed a remarkable aggrandizement.
