Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemio...Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemiological survey for a period of four years on the impact of meteorological factors （minimal temperature, mean temperature, maximal temperature, average daily surface temperature, day temperature range, relative humidity, mean wind speed, and atmospheric pressure） and PM2.5 concentration on the daily incidences of acute aortic dissections. Meteorological variables and PM2.5 concentration were retrieved on a daily basis from Beijing Regional Climate Center and the Ministry of Environmental Protection of the People’s Republic of China’s website, and the daily incidences of acute aortic dissections were retrieved from the Clinical Data Analysis and Reporting System in the Emergency and Critical Care Center of Beijing Anzhen Hospital. Results During the study period （from January 2011 to December 2014）, 1164 patients were identified as having acute aortic dissections. The corresponding incidences in spring and autumn were 0.96 and 1.00, respectively, which significantly higher than that in summer and winter. The incidences of acute aortic dissection in a day could be predicted by diurnal temperature range （DTR） using the following linear multiple regression models： incidences of acute aortic dissection = 0.543 ＋ 0.025 × DTR. Conclusion This is the first study to show an attributable effect of DTR on acute aortic events in monsoonal climate. Our study confirms that meteorological variables were important factors influencing the incidence of acute aortic dissection.展开更多
The gross anatomy and the histology of the alimentary tract of the larva of palm weevil, Rhynchophorus phoenicis were described in this study. The results showed that the alimentary system of the insect has three dist...The gross anatomy and the histology of the alimentary tract of the larva of palm weevil, Rhynchophorus phoenicis were described in this study. The results showed that the alimentary system of the insect has three distinct partS, the foregut, midgut and hindgut. In the foregut are oesophagus, crop and proventriculus （gizzard）. The crop was the biggest part of the alimentary system, suggesting that the larva consumes big amount of food. Muscular proventriculus was present at the base of the foregut and it is the place where the food of the larva is pulverized. The midgut was the longest part of the alimentary tract. The anterior portion of the midgut is located in the thoracic region while the distal part which is coiled is embedded in the abdominal segments. The midgut epithelium is characterized by columnar cells, goblet cells, villi, microvilli, cappilaries and peritrophic membranes. The membrane helps to protect the midgut cells from damage from abrasive food particles. The hindgut forms the posterior part of the alimentary system and it consists of the ileum and rectum which terminates in the anus. There no villi but temporary folds of submucosa and mucosa layers. There are adipose cells, goblet cells, intestinal glands, circular and longitudinal muscles in this region.展开更多
基金This study was supported by National Science Foundation Council of China （No.81700383）, Jilin Provincial Industrial Innovation Special Fund Project （No.2016C041）, Beijing Natural Science Foundation of China （8152019）, Beijing Municipal Science and Technology of Chinese Medicine Development Funds Youth Research Project （No. QN2016-20）, and Basic-Clinical Scientific Research Cooperation of Capital Medical University fund （No.17JL72）. The authors declare no conflict of interest.
文摘Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemiological survey for a period of four years on the impact of meteorological factors （minimal temperature, mean temperature, maximal temperature, average daily surface temperature, day temperature range, relative humidity, mean wind speed, and atmospheric pressure） and PM2.5 concentration on the daily incidences of acute aortic dissections. Meteorological variables and PM2.5 concentration were retrieved on a daily basis from Beijing Regional Climate Center and the Ministry of Environmental Protection of the People’s Republic of China’s website, and the daily incidences of acute aortic dissections were retrieved from the Clinical Data Analysis and Reporting System in the Emergency and Critical Care Center of Beijing Anzhen Hospital. Results During the study period （from January 2011 to December 2014）, 1164 patients were identified as having acute aortic dissections. The corresponding incidences in spring and autumn were 0.96 and 1.00, respectively, which significantly higher than that in summer and winter. The incidences of acute aortic dissection in a day could be predicted by diurnal temperature range （DTR） using the following linear multiple regression models： incidences of acute aortic dissection = 0.543 ＋ 0.025 × DTR. Conclusion This is the first study to show an attributable effect of DTR on acute aortic events in monsoonal climate. Our study confirms that meteorological variables were important factors influencing the incidence of acute aortic dissection.
文摘The gross anatomy and the histology of the alimentary tract of the larva of palm weevil, Rhynchophorus phoenicis were described in this study. The results showed that the alimentary system of the insect has three distinct partS, the foregut, midgut and hindgut. In the foregut are oesophagus, crop and proventriculus （gizzard）. The crop was the biggest part of the alimentary system, suggesting that the larva consumes big amount of food. Muscular proventriculus was present at the base of the foregut and it is the place where the food of the larva is pulverized. The midgut was the longest part of the alimentary tract. The anterior portion of the midgut is located in the thoracic region while the distal part which is coiled is embedded in the abdominal segments. The midgut epithelium is characterized by columnar cells, goblet cells, villi, microvilli, cappilaries and peritrophic membranes. The membrane helps to protect the midgut cells from damage from abrasive food particles. The hindgut forms the posterior part of the alimentary system and it consists of the ileum and rectum which terminates in the anus. There no villi but temporary folds of submucosa and mucosa layers. There are adipose cells, goblet cells, intestinal glands, circular and longitudinal muscles in this region.
