According to the data surveyed and released respectively by 3 official authorities including the Bureau of Agricultural Economics under US Department of Agriculture,Bureau of Labor Statistics under US Department of La...According to the data surveyed and released respectively by 3 official authorities including the Bureau of Agricultural Economics under US Department of Agriculture,Bureau of Labor Statistics under US Department of Labor and the Census Bureau under US Department of Commerce,the agricultural population in the United States had a sharp decrease in 1910-1970,and the population structure had completed the transition from agricultural population to industrial population. But there are also some omissions in the official statistical data,mainly including the " agricultural service" workers,floating agricultural population,illegal immigrants and child laborers. These 4 kinds of labor force population that directly or indirectly engage in farm production are not included in the agricultural population of the United States. For the purpose of exaggerating agricultural labor productivity and covering up exploitation from the perspective of the official US authorities and due to limited statistical methods as well as complicated conditions,some data problems including great difference in agricultural population statistics and inaccurate absolute quantity have been caused.展开更多
A seroprevalence investigation of human brucellosis was carried out in Kuku Dairy Scheme, Sudan. A total of 176 serum samples were collected and screened by Rose Bengal Plate Test （RBPT）. The positive sera vqere fur...A seroprevalence investigation of human brucellosis was carried out in Kuku Dairy Scheme, Sudan. A total of 176 serum samples were collected and screened by Rose Bengal Plate Test （RBPT）. The positive sera vqere further examined using Tube Agglutination Test （TAT） and c-Elisa. The seropositivity was 15.9%, 14.8% and 11.4% using RBPT, TAT and c-Elisa respectively. Whereas, the active infection based on seropositivity and clinical signs were 4.6%, 4.6% and 2.3% in case of RBPT, TAT and c-Elisa respectively. Based on c-Elisa result the infected individuals were further subjected to clinical examination and treated with streptomycin and doxocycline for six weeks.展开更多
基金Supported by Shaanxi Social Science Foundation Program of 2014(2014D24)
文摘According to the data surveyed and released respectively by 3 official authorities including the Bureau of Agricultural Economics under US Department of Agriculture,Bureau of Labor Statistics under US Department of Labor and the Census Bureau under US Department of Commerce,the agricultural population in the United States had a sharp decrease in 1910-1970,and the population structure had completed the transition from agricultural population to industrial population. But there are also some omissions in the official statistical data,mainly including the " agricultural service" workers,floating agricultural population,illegal immigrants and child laborers. These 4 kinds of labor force population that directly or indirectly engage in farm production are not included in the agricultural population of the United States. For the purpose of exaggerating agricultural labor productivity and covering up exploitation from the perspective of the official US authorities and due to limited statistical methods as well as complicated conditions,some data problems including great difference in agricultural population statistics and inaccurate absolute quantity have been caused.
文摘A seroprevalence investigation of human brucellosis was carried out in Kuku Dairy Scheme, Sudan. A total of 176 serum samples were collected and screened by Rose Bengal Plate Test （RBPT）. The positive sera vqere further examined using Tube Agglutination Test （TAT） and c-Elisa. The seropositivity was 15.9%, 14.8% and 11.4% using RBPT, TAT and c-Elisa respectively. Whereas, the active infection based on seropositivity and clinical signs were 4.6%, 4.6% and 2.3% in case of RBPT, TAT and c-Elisa respectively. Based on c-Elisa result the infected individuals were further subjected to clinical examination and treated with streptomycin and doxocycline for six weeks.
