Dear Editor,Allergic conjunctivitis is the most common ocular surface allergic disease, affecting more than 30% of the population[1-2]. In the immediate phase of the allergic reactions(type Ⅰ) in patients with season...Dear Editor,Allergic conjunctivitis is the most common ocular surface allergic disease, affecting more than 30% of the population[1-2]. In the immediate phase of the allergic reactions(type Ⅰ) in patients with seasonal allergic conjunctivitis(SAC), the binding of antigen with the reaginic antibody leads to the formation and release of chemical mediators, such as histamines, in the local anaphylactic reaction[3].展开更多
By studying the county-level census data of 1990 and 2000, we analyzed the spatial and temporal changes in the floating population in China between 1990 and 2000. The results of the analysis revealed the following cha...By studying the county-level census data of 1990 and 2000, we analyzed the spatial and temporal changes in the floating population in China between 1990 and 2000. The results of the analysis revealed the following characteris- tics. First, the spatial distribution of the migrants (referred to as 'floaters' in this paper) became increasingly concentrated in the cities during the 1990s. Second, the number of floaters increased rapidly during this period, and the area in which the floaters settled expanded quickly into four population explosion belts: the coast, the Changjiang River Delta, the Beijing-Guangzhou Railway and national border belts. Third, the number of inter-province floaters increased rapidly and exceeded that of intra-province floaters in the 1990s. In addition, to obtain a quantitative relationship between the number of floaters and 10 socio-economic variables by using statistical methods and also to find the chiefly important pulling factors of the migration destination, the authors selected approximately 100 cities with the largest population of floaters. Consequently, we found that four factors-GDP, passenger trips per 10,000 persons, per capita GDP and foreign direct investment-could provide an explanation for 83.7% of the number of floaters in 2000. The GDP showed the highest correlation with the number of floaters, suggesting that a highly developed economy is the most important factor that attracts floaters. Furthermore, a fairly close relationship between the number of floaters and the GDP was also found in 2000 for all the counties.展开更多
文摘Dear Editor,Allergic conjunctivitis is the most common ocular surface allergic disease, affecting more than 30% of the population[1-2]. In the immediate phase of the allergic reactions(type Ⅰ) in patients with seasonal allergic conjunctivitis(SAC), the binding of antigen with the reaginic antibody leads to the formation and release of chemical mediators, such as histamines, in the local anaphylactic reaction[3].
基金Under the auspices of the Domestic Research Fellowship of the Japan Foundation of Public Communication on Scienceand Technology (No. H-3)
文摘By studying the county-level census data of 1990 and 2000, we analyzed the spatial and temporal changes in the floating population in China between 1990 and 2000. The results of the analysis revealed the following characteris- tics. First, the spatial distribution of the migrants (referred to as 'floaters' in this paper) became increasingly concentrated in the cities during the 1990s. Second, the number of floaters increased rapidly during this period, and the area in which the floaters settled expanded quickly into four population explosion belts: the coast, the Changjiang River Delta, the Beijing-Guangzhou Railway and national border belts. Third, the number of inter-province floaters increased rapidly and exceeded that of intra-province floaters in the 1990s. In addition, to obtain a quantitative relationship between the number of floaters and 10 socio-economic variables by using statistical methods and also to find the chiefly important pulling factors of the migration destination, the authors selected approximately 100 cities with the largest population of floaters. Consequently, we found that four factors-GDP, passenger trips per 10,000 persons, per capita GDP and foreign direct investment-could provide an explanation for 83.7% of the number of floaters in 2000. The GDP showed the highest correlation with the number of floaters, suggesting that a highly developed economy is the most important factor that attracts floaters. Furthermore, a fairly close relationship between the number of floaters and the GDP was also found in 2000 for all the counties.
