Comparison of manual and automatic methods for measurement of methane emission from rice paddy fields

The methane emission flux from rice paddies was simultaneously measured with automatic and manual methods in the suburban of Suzhou. Both methods were based on the static chamber/ GC-FID techniques. Detail analysis of the experimental results indicates: a) The data of methane emission measured with the automatic method is reliable. b) About 11 or 19 o’clock of local time is recommended as the optimum sampling time for the manual spot measurement of methane emission from rice paddies. The methane emission fluxes measured by manual sampling at local time other than the optimum time have to be corrected. The correction coefficient may be determined by automatic and continuous measurement. c) In order to get a more accurate result, an empirical correction factor, such as 18%, is recommended to correct the seasonally total amount of measured methane emission by enlarging the au-tomatically measured data or reducing the manually measured ones.     

澳大利亚前寒武系和寒武系迭层石的分布

前言我们在澳大利亚工作的目的是检验苏联迭层石分类及其分带方案(Scheme)的可靠性。我们发现他们的分类,如在别处讨论过的一样,在我们的迭层石中一般是可应用的。我们尽可能广泛地获得了迭层石在地理和时代(temporal)上分布范围的资料。普里斯(1971)对阿得累德(Adelaide)地槽前寒武纪和寒武纪迭层石作了详细的地层和岩相研究。沃尔特(1970,1972)研究了阿马德斯(Amadeus)、乔治纳(Georgina)、麦卡阿瑟     

Expression of the Phycoerythrin Gene of Gracilaria lemaneiformis (Rhodophyta) in E. coli and Evaluation of the Bioactivity of Recombinant PE

Phycoerythrin (PE) is one of the most important proteins involved in light capturing during photosynthesis in red algae. Its potential biological activities had gained wide concerns. In the present study, tumor cytotoxic and hydroxyl radical assay were preformed to detect the bioactivity of recombinant PE. Recombinant plasmids pGEX-PE and pBGL were transformed into E.coli BL21 to make two recombinant strains BEX (pGEX-PE) and BGL (pBGL). PE expressing in BEX (pGEX-PE) was validated by SDS-PAGE and Western blotting analysis. SDS-PAGE analysis indicated that the PE-GST fusion protein was mostly inclusion bod- ies. Specific expression of PE was confirmed by Western blotting analysis. The recombinant E. coli BEX (pGEX-PE) cells were col- lected and sonicated. The supernatants were reserved for the tumor cytotoxic experiments. The result of tumor cytotoxic assay indi- cated that the supernatants containing PE had the activity of inhibiting the growth of Hela cells and with the increase of protein con- centration, the inhibiting rate increased from 37.31% to 63.26%, which showed significant difference from the control. Hydroxyl radical scavenging effect was tested with supernatants of BEX (pGEX-PE) and BGL (pBGL) cell lysates treated with sonication and heating. For the sonication samples, the scavenging rates of the supernatants of BEX (pGEX-PE) and BGL (pBGL) cell lysates were significantly higher than the negative control BL21(pGEX-4T) (P<0.02), and the scavenging rates increased slowly following the increase of the protein content. For the heating samples, except for the 0.2 mg mL-1 BGL (pBGL) products, the scavenging effects of the supernatants of BEX (pGEX-PE) and BGL (pBGL) cell lysates were stronger than that of negative control BL21(pGEX-4T). However, the effect intensity was not positively correlated with the increase of the protein concentration. Though a partially de- creased hydroxyl radical scavenging activity was led by heating, the biological activity was still retained and conspicuous. This re- search showed that phycoerythrin protein expressing in E. coli has the potential medical and sanitarian value.     

A Metallogenic Model of Gold Deposits of the Jiaodong Granite-Greenstone Belt

An analysis of trace elements and isotopic geochemistry suggest that the ore-forming materials of gold deposits in the Jiaodong granite-greenstone belt have multiple sources, especially the mantle source. Seismic wave, magnetic and gravity fields show that the crust-mantle structure and its coupling mechanism are the fundamental dynamic causes for the exchange and accumulation of materials and energy in the metallogenic system. Considering the evolution history of the structural setting, the tectono-metallogenic dynamics model of the area can be summarized as follows: (1) occurrence of the greenstone belt during the Archean-Proterozoic-the embryonic form of Au-source system; (2) stable tectonic setting in the Paleozoic-an intermittence in gold mineralization; (3) intensive activation and reformation of the greenstone belt in the Mesozoic-tectono-mineralization and tectono-diagensis; (4) posthumous structural activity in the Cenozoic-destruction of orebodies in the later stage. In the middle and late Ind     

垂直指向多卜勒雷达测量大气垂直运动和雨滴谱等物理量的方法

在假定雨滴谱为指数分布的基础上,本文提出用垂直指向多卜勒雷达同时测量与雨和风有关的参量的新方法,即用多卜勒谱的倾斜率M_3(也就是谱的三阶中心距)和反射因子Z估计谱参量N_0和λ、大气垂直速度、由风切变和乱流引起的多卜勒谱宽、降雨含水量M和雨强R。这方法的主要优点在于乱流和风切变对M3的影响很小。作者在理论上和用数值模拟分析讨论了这方法的原理和误差。对一实例计算表明,M_3确实是与实测多卜勒谱有关的信号。最后对文中提出的由M3选择确切的λ值的技术作了初步讨论。     

震后快速钻探:历史、现状与未来

大地震发生后立即在断层带上进行钻探可以帮助我们获取更多的地震信息,尤其是可获得决定断层动态破裂的摩擦水平和强度,观测断层的愈合过程及可能触发余震的应力变化,并可获取控制破裂过程的重要的物理和化学属性。在2008年11月由国际大陆科学钻探项目（ICDP）和南加州地震中心（SCEC）联合在日本东京举办的为期3天的“震后快速钻探：历史、现状与未来”研讨会上,     

大别造山带140～85 Ma热窿伸展作用

区域热年代和差异冷却特性表明, 140～85 Ma大别造山带进入热窿伸展作用时期, 由此引发基底广泛熔融、北淮阳剧烈火山喷溢以及合肥盆地断陷等过程. 这次热窿事件包括强热伸展阶段(140~105 Ma)和晚期衰退阶段(105~85 Ma). 在强热伸展阶段, 热窿区集中在大别/红安地块, 并以大别地块热窿作用最为强烈, 某种意义上可将红安地块视为大别热窿翼部. 大别热窿构造包括麻城-岳西热轴、穹核组合及其外围翼部, 热轴平行造山带延向展布, 北淮阳与高压/超高压(HP/UHP)岩石构成下滑翼部, 岳西、罗田热窿核分别占据麻城-岳西热轴东、西两端, 它们最终成型时代不一致. 热窿伸展进程伴随着大别强热中心沿着麻城-岳西热轴迁移摆动, 如果将热窿事件与造山带根部拆沉相联系, 这种拆沉作用应以间歇性、迁移性、规模性与区域差异性为特征. 在伸展衰退阶段(105~85 Ma), 大别造山带仍显现穹状热窿布局, 但其伸展强度、岩浆活动显著减弱. 解析热窿伸展作用, 对于认识大别HP/UHP岩折返模型、"南北大别界限"以及造山过程机理具有重要启示意义.     

HYDROPOWER RESOURCES IN UPPER YANGTZE

ＨＹＤＲＯＰＯＷＥＲＲＥＳＯＵＲＣＥＳＩＮＵＰＰＥＲＹＡＮＧＴＺＥＣＨＥＮＪｉｓｈｅｎｇ（ＤｉｒｅｃｔｏｒＥｍｅｒｉｔｕｓ，ＹａｎｇｔｚｅＲｉｖｅｒＳｃｉｅｎｔｉｆｉｃＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ（ＹＲＳＲＩ），２３ＨｕａｎｇｐｕＲｏａｄ，Ｗｕ...