By taking Macheng City as the research area, based on the questionnaire survey of peasants, a deep analysis has been conducted on the change of rural housing construction in the past 30 years. The results show that th...By taking Macheng City as the research area, based on the questionnaire survey of peasants, a deep analysis has been conducted on the change of rural housing construction in the past 30 years. The results show that there are many old houses in villages and it has a higher potential requirement for the improvement of rural housing condition; rural housing construction comes to its climax twice and presents to change in the shape of "N"; and primary factors affecting the size of rural house site by multicolinearity regression model contain annual net income of peasant household, land source of house site, reform of rural taxes and administrative charges, transport condition and comparison psychology.展开更多
ON the 15th day of one lunarmonth in 1998,a group of people on bicycles streamedinto the county fair in Macheng.Assoon as they arrived they unpackedthe bicycles which were loaded withbooks,technical materials andphoto...ON the 15th day of one lunarmonth in 1998,a group of people on bicycles streamedinto the county fair in Macheng.Assoon as they arrived they unpackedthe bicycles which were loaded withbooks,technical materials andphotographs.They put the books andmaterials on a table and pulled outsome string they had brought展开更多
Many centuries ago, Li Zhi (1527-1602), thinker andwriter of the Ming Dynasty edtablished a famousfemale-only school in China. Today, there has emergeda group of women writers. They are sparing their timefrom work and...Many centuries ago, Li Zhi (1527-1602), thinker andwriter of the Ming Dynasty edtablished a famousfemale-only school in China. Today, there has emergeda group of women writers. They are sparing their timefrom work and household chores and have entered thesacred hall of literature by expending greater effortsthan their male counterparts. Many of their works havebeen published. They are full of talent and have wonseveral national level prizes.展开更多
[Objective] This study aimed to investigate the genetic diversity of Macheng black goat and its correlation with heterosis.[Method] Ten microsatellite markers were selected for polymorphism investigation and statistic...[Objective] This study aimed to investigate the genetic diversity of Macheng black goat and its correlation with heterosis.[Method] Ten microsatellite markers were selected for polymorphism investigation and statistical analysis of Boer goat and Macheng black goat populations.[Result] The results showed that totally 175 alleles were found in 10 microsatellite loci; to be specific,the maximum number of detected alleles was 23,and the minimum number was 10; the effective number of alleles （Ne） was 6.4-18.1,with absolute difference value of 1.6-8.1 from the observed number of alleles.The highest gene frequency was 0.239 1 and the lowest was 0.002 7.The polymorphic information contents of all the ten microsatellite markers were above 0.95.The observed heterozygosity （Ho） ranged from 0.616 7 to 0.984 4 and the expected heterozygosity （He） ranged from 0.844 1 to 0.944 6.The average expected heterozygosity of Boer goat and Macheng black goat was respectively 0.894 0 and 0.906 7.Various body weight and body size indices of Boer goatxMacheng black goat hybrids were improved in varying degrees compared with Macheng black goat （with an increase range of 0.32％-30.06％）.The average heterosis rates of body height and chest girth were relatively high,while average heterosis rate of body weight was relatively low.[Conclusion] The genetic distance between Boer goat and Macheng black goat was 0.379 5,which is consistent with the geographical distribution of Boer goat and Macheng black goat populations and is fully relevant to the heterosis of Boer goat × Macheng black goat hybrids,indicating that investigating polymorphism via microsatellite loci is one of the feasible means to predict and analyze heterosis between varieties.展开更多
文摘By taking Macheng City as the research area, based on the questionnaire survey of peasants, a deep analysis has been conducted on the change of rural housing construction in the past 30 years. The results show that there are many old houses in villages and it has a higher potential requirement for the improvement of rural housing condition; rural housing construction comes to its climax twice and presents to change in the shape of "N"; and primary factors affecting the size of rural house site by multicolinearity regression model contain annual net income of peasant household, land source of house site, reform of rural taxes and administrative charges, transport condition and comparison psychology.
文摘ON the 15th day of one lunarmonth in 1998,a group of people on bicycles streamedinto the county fair in Macheng.Assoon as they arrived they unpackedthe bicycles which were loaded withbooks,technical materials andphotographs.They put the books andmaterials on a table and pulled outsome string they had brought
文摘Many centuries ago, Li Zhi (1527-1602), thinker andwriter of the Ming Dynasty edtablished a famousfemale-only school in China. Today, there has emergeda group of women writers. They are sparing their timefrom work and household chores and have entered thesacred hall of literature by expending greater effortsthan their male counterparts. Many of their works havebeen published. They are full of talent and have wonseveral national level prizes.
文摘[Objective] This study aimed to investigate the genetic diversity of Macheng black goat and its correlation with heterosis.[Method] Ten microsatellite markers were selected for polymorphism investigation and statistical analysis of Boer goat and Macheng black goat populations.[Result] The results showed that totally 175 alleles were found in 10 microsatellite loci; to be specific,the maximum number of detected alleles was 23,and the minimum number was 10; the effective number of alleles （Ne） was 6.4-18.1,with absolute difference value of 1.6-8.1 from the observed number of alleles.The highest gene frequency was 0.239 1 and the lowest was 0.002 7.The polymorphic information contents of all the ten microsatellite markers were above 0.95.The observed heterozygosity （Ho） ranged from 0.616 7 to 0.984 4 and the expected heterozygosity （He） ranged from 0.844 1 to 0.944 6.The average expected heterozygosity of Boer goat and Macheng black goat was respectively 0.894 0 and 0.906 7.Various body weight and body size indices of Boer goatxMacheng black goat hybrids were improved in varying degrees compared with Macheng black goat （with an increase range of 0.32％-30.06％）.The average heterosis rates of body height and chest girth were relatively high,while average heterosis rate of body weight was relatively low.[Conclusion] The genetic distance between Boer goat and Macheng black goat was 0.379 5,which is consistent with the geographical distribution of Boer goat and Macheng black goat populations and is fully relevant to the heterosis of Boer goat × Macheng black goat hybrids,indicating that investigating polymorphism via microsatellite loci is one of the feasible means to predict and analyze heterosis between varieties.
