Sargassum horneri is a common brown macro-alga that is found in the inter-tidal ecosystems of China. To investigate the current status of seaweed resources and provide basic data for its sustainable development, ISSR ...Sargassum horneri is a common brown macro-alga that is found in the inter-tidal ecosystems of China. To investigate the current status of seaweed resources and provide basic data for its sustainable development, ISSR (inter simple sequence repeat) and SRAP (sequence related amplified polymorphism) markers were used to analyze the population genetics among nine natural populations of S. horneri. The nine studied populations were distributed over 2 000 km from northeast to south China. The percentage of polymorphic loci P% (ISSR, 99.44%; SRAP, 100.00%), Nei's genetic diversity H (ISSR, 0.107-0.199; SRAP, 0.100-0.153), and Shannon's information index I (ISSR, 0.157-0.291; SRAP, 0.148-0.219) indicated a fair amount of genetic variability among the nine populations. Moreover, the high degree of gene differentiation G st (ISSR, 0.654; SRAP, 0.718) and low gene flow N m (ISSR, 0.265; SRAP, 0.196) implied that there was significant among-population differentiation, possibly as a result of habitat fragmentation. The matrices of genetic distances and fixation indices (F st ) among the populations correlated well with their geographical distribution (Mantel test R=0.541 5, 0.541 8; P=0.005 0, 0.002 0 and R=0.728 6, 0.641 2; P=0.001 0, 0.001 0, respectively); the Rongcheng population in the Shandong peninsula was the only exception. Overall, the genetic differentiation agreed with the geographic isolation. The fair amount of genetic diversity that was revealed in the S. horneri populations in China indicated that the seaweed resources had not been seriously affected by external factors.展开更多
Given Latin America＇s historical and robust religiosity, how do sociologists explain that Uruguay became an extremely secular society since the turn of the twentieth century？ Earliest attempts to interpret and expla...Given Latin America＇s historical and robust religiosity, how do sociologists explain that Uruguay became an extremely secular society since the turn of the twentieth century？ Earliest attempts to interpret and explain Uruguayan secular society came in the 1960s from Uruguayan scholars. Typically, these studies were produced by religious practitioners, or at least researchers sympathetic to religion, who attributed weak religiosity, at least weak Catholicism, to two factors： the lack of a colonial heritage and European immigration. Counterfactuals to the ＂weak institution＂ and the ＂social base＂ claims are based on new research, especially as it pertains to immigration and settlement patterns among Italian and Spanish immigrants. The counter-arguments presented here, while not entirely invalidating the ＂social base＂ and ＂weak institutional church＂ claims make it more difficult to assume that urban demographics and ecclesiastical history in Uruguay are significantly correlated to the secularization of Uruguayan society. This study is important because it creates theoretical space that should stimulate researchers to consider alternative causes for Uruguayan secular society that provide greater explanatory power by integrating historically contingent evidence in the context of theoretical explanation展开更多
This paper presents a brief analysis of the frequency and cumulative distributions of Americans＇ annual household income. In addition, a thorough discussion of the correlations between average income and some key dem...This paper presents a brief analysis of the frequency and cumulative distributions of Americans＇ annual household income. In addition, a thorough discussion of the correlations between average income and some key demographic variables are included. The data come from the 2004 Survey of Consumer Finances. Utilizing the Survey a new, extraordinarily close, power law, relationship between current annual household income and accumulated financial assets is demonstrated. Another startling result is that the dependence of mean annual income on portfolio composition has nearly perfect power law dependence too. As money has scale, and power laws do not, this makes no sense.展开更多
基金Supported by the National Natural Science Foundation of China(Nos.40618001,40976085)the Chinese Academy of Sciences and Guangdong Provincial Joint Projects(No.2009B091300086)Public Science and Technology Research Funds Projects of Ocean
文摘Sargassum horneri is a common brown macro-alga that is found in the inter-tidal ecosystems of China. To investigate the current status of seaweed resources and provide basic data for its sustainable development, ISSR (inter simple sequence repeat) and SRAP (sequence related amplified polymorphism) markers were used to analyze the population genetics among nine natural populations of S. horneri. The nine studied populations were distributed over 2 000 km from northeast to south China. The percentage of polymorphic loci P% (ISSR, 99.44%; SRAP, 100.00%), Nei's genetic diversity H (ISSR, 0.107-0.199; SRAP, 0.100-0.153), and Shannon's information index I (ISSR, 0.157-0.291; SRAP, 0.148-0.219) indicated a fair amount of genetic variability among the nine populations. Moreover, the high degree of gene differentiation G st (ISSR, 0.654; SRAP, 0.718) and low gene flow N m (ISSR, 0.265; SRAP, 0.196) implied that there was significant among-population differentiation, possibly as a result of habitat fragmentation. The matrices of genetic distances and fixation indices (F st ) among the populations correlated well with their geographical distribution (Mantel test R=0.541 5, 0.541 8; P=0.005 0, 0.002 0 and R=0.728 6, 0.641 2; P=0.001 0, 0.001 0, respectively); the Rongcheng population in the Shandong peninsula was the only exception. Overall, the genetic differentiation agreed with the geographic isolation. The fair amount of genetic diversity that was revealed in the S. horneri populations in China indicated that the seaweed resources had not been seriously affected by external factors.
文摘Given Latin America＇s historical and robust religiosity, how do sociologists explain that Uruguay became an extremely secular society since the turn of the twentieth century？ Earliest attempts to interpret and explain Uruguayan secular society came in the 1960s from Uruguayan scholars. Typically, these studies were produced by religious practitioners, or at least researchers sympathetic to religion, who attributed weak religiosity, at least weak Catholicism, to two factors： the lack of a colonial heritage and European immigration. Counterfactuals to the ＂weak institution＂ and the ＂social base＂ claims are based on new research, especially as it pertains to immigration and settlement patterns among Italian and Spanish immigrants. The counter-arguments presented here, while not entirely invalidating the ＂social base＂ and ＂weak institutional church＂ claims make it more difficult to assume that urban demographics and ecclesiastical history in Uruguay are significantly correlated to the secularization of Uruguayan society. This study is important because it creates theoretical space that should stimulate researchers to consider alternative causes for Uruguayan secular society that provide greater explanatory power by integrating historically contingent evidence in the context of theoretical explanation
文摘This paper presents a brief analysis of the frequency and cumulative distributions of Americans＇ annual household income. In addition, a thorough discussion of the correlations between average income and some key demographic variables are included. The data come from the 2004 Survey of Consumer Finances. Utilizing the Survey a new, extraordinarily close, power law, relationship between current annual household income and accumulated financial assets is demonstrated. Another startling result is that the dependence of mean annual income on portfolio composition has nearly perfect power law dependence too. As money has scale, and power laws do not, this makes no sense.
