目的根据白术Atractylodis Macrocephalae Rhizoma指纹图谱形状特征,建立一种快速精准辨识不同产地与炮制品的方法。方法建立45批不同产地与炮制法的白术UPLC指纹图谱库,运用总量统计矩及相似度法、正交偏最小二乘-判别分析(orthogonal ...目的根据白术Atractylodis Macrocephalae Rhizoma指纹图谱形状特征,建立一种快速精准辨识不同产地与炮制品的方法。方法建立45批不同产地与炮制法的白术UPLC指纹图谱库,运用总量统计矩及相似度法、正交偏最小二乘-判别分析(orthogonal partial least squares-discriminant analysis,OPLS-DA)法辨析此指纹图谱的形状特点,捕获其特征指纹图谱及特征峰。结果生品、麸炒、土炒白术UPLC指纹图谱的共有峰16个;安徽与湖南、安徽与浙江、湖南与浙江产地的生白术的总量统计矩相似度分别为0.774~0.982、0.799~0.969、0.788~0.886;3产地的生品与麸炒、生品与土炒、麸炒与土炒白术的总量统计矩相似度中最大值为0.990, 最小值为0.774。再结合OPLS-DA法中变量重要性投影(variable importance for the projection,VIP)分析获得其中1~3、6、16号为区分贡献度最大的5个标志峰,确认6号峰为白术内酯II。结论这5个标志峰对应物质可认定白术的潜在质量标志物(Q-Marker),为白术的产地、炮制法的精准识别及其质量控制与评价提供理论与实验依据,同时也为中药指纹图谱辨形论质做了积极探索。展开更多
Background Human bocavirus （HBoV） is a parvovirus recently found to possibly cause respiratory tract disease in children and adults. This study investigated HBoV infection and its clinical characteristics in childre...Background Human bocavirus （HBoV） is a parvovirus recently found to possibly cause respiratory tract disease in children and adults. This study investigated HBoV infection and its clinical characteristics in children younger than five years of age suffering from acute lower respiratory tract infection in Beijing Children＇s Hospital. Methods Nasopharyngeal aspirates were collected from children suffering from acute lower respiratory tract infection during the winters of 2004 to 2006 （from November through the following February）. HBoV was detected by polymerase chain reaction amplification and virus isolation and the amplification products were sequenced for identification. Results HBoV infection was detected in 16 of 333 study subjects. Coinfections with respiratory syncytial virus were detected in 3 of 16 HBoV positive patients with acute lower respiratory tract infection. The median age for HBoV positive children was 8 months （mean age, 17 months; range, 3 to 57 months）. Among the HBoV positive children, 14 were younger than 3 years old, 9 were younger than 1 year old and 7 were younger than 6 months. These 16 positive HBoV children exhibited coughing and abnormal chest radiography findings and more than 60% of these children had wheezing and fever. Ten children were clinically diagnosed with pneumonia, 2 bronchiolitis, 2 acute bronchitis and 2 asthma. One child died. Conclusions HBoV was detected in about 5% of children with acute lower respiratory infection seen in Beijing Children＇s HosPital. Further investigations regarding clinical and epidemiologic characteristics of HBoV infection are needed.展开更多
文摘目的根据白术Atractylodis Macrocephalae Rhizoma指纹图谱形状特征,建立一种快速精准辨识不同产地与炮制品的方法。方法建立45批不同产地与炮制法的白术UPLC指纹图谱库,运用总量统计矩及相似度法、正交偏最小二乘-判别分析(orthogonal partial least squares-discriminant analysis,OPLS-DA)法辨析此指纹图谱的形状特点,捕获其特征指纹图谱及特征峰。结果生品、麸炒、土炒白术UPLC指纹图谱的共有峰16个;安徽与湖南、安徽与浙江、湖南与浙江产地的生白术的总量统计矩相似度分别为0.774~0.982、0.799~0.969、0.788~0.886;3产地的生品与麸炒、生品与土炒、麸炒与土炒白术的总量统计矩相似度中最大值为0.990, 最小值为0.774。再结合OPLS-DA法中变量重要性投影(variable importance for the projection,VIP)分析获得其中1~3、6、16号为区分贡献度最大的5个标志峰,确认6号峰为白术内酯II。结论这5个标志峰对应物质可认定白术的潜在质量标志物(Q-Marker),为白术的产地、炮制法的精准识别及其质量控制与评价提供理论与实验依据,同时也为中药指纹图谱辨形论质做了积极探索。
文摘Background Human bocavirus （HBoV） is a parvovirus recently found to possibly cause respiratory tract disease in children and adults. This study investigated HBoV infection and its clinical characteristics in children younger than five years of age suffering from acute lower respiratory tract infection in Beijing Children＇s Hospital. Methods Nasopharyngeal aspirates were collected from children suffering from acute lower respiratory tract infection during the winters of 2004 to 2006 （from November through the following February）. HBoV was detected by polymerase chain reaction amplification and virus isolation and the amplification products were sequenced for identification. Results HBoV infection was detected in 16 of 333 study subjects. Coinfections with respiratory syncytial virus were detected in 3 of 16 HBoV positive patients with acute lower respiratory tract infection. The median age for HBoV positive children was 8 months （mean age, 17 months; range, 3 to 57 months）. Among the HBoV positive children, 14 were younger than 3 years old, 9 were younger than 1 year old and 7 were younger than 6 months. These 16 positive HBoV children exhibited coughing and abnormal chest radiography findings and more than 60% of these children had wheezing and fever. Ten children were clinically diagnosed with pneumonia, 2 bronchiolitis, 2 acute bronchitis and 2 asthma. One child died. Conclusions HBoV was detected in about 5% of children with acute lower respiratory infection seen in Beijing Children＇s HosPital. Further investigations regarding clinical and epidemiologic characteristics of HBoV infection are needed.
