The aim was to measure the incidence of high altitude headache （HAH） and to determine clinical features, as well as the relation between acute mountain sickness （AMS） and HAH through a prospective study. We conduc...The aim was to measure the incidence of high altitude headache （HAH） and to determine clinical features, as well as the relation between acute mountain sickness （AMS） and HAH through a prospective study. We conducted a questionnaire-based study among construction workers in Yushu after a serious earthquake ; they were under reconstruction using a structured questionnaire incorporating International Headache Society （IHS） and AMS Lake Louise Scoring System. A total of 608 workers were enrolled after their first ascent to altitudes of 3 750-4 528 m. The results showed that 96 % reported at least 1 HAil（median 3.8, range from 1 to 10） in workers at a mean altitude of 4 250 m. The magnitude of headache was divided as mild（38 %）, moderate （44 % ） and severe （18 %）. This study indicates that HAH is the most common symptom of acute altitude exposure and closely corre- lated with altitude （r=0.165, p〈0.001）. However, 52 % of headache was one of the main symptoms of AMS, while the other 48 % was the sole symptom of HAH. On the contrary we found that 2 % of AMS without headache, thus the ＂painless AMS＂ actually existed. The clinical features of HAH are presented, and the relationship between AMS and HAH is discussed.展开更多
Over the last three decades, the presence and functional roles of arbuscular mycorrhizal （AM） fungi in wetland habitats have received increasing attention. This review summarized the mycorrhizal status in wetlands a...Over the last three decades, the presence and functional roles of arbuscular mycorrhizal （AM） fungi in wetland habitats have received increasing attention. This review summarized the mycorrhizal status in wetlands and the effect of flooding on AM fungal colonization. Plants of 99 families living in 31 different habitats have been found to be associated with AM fungi, even including submerged aquatic plants and several plant species that were thought to be nonmycorrhizal （Cyperaceae, Chenopodiaceae, and Plumbaginaceac）. The functions of AM fungi in wetland ecological systems could be concluded as their influences on the composition, succession, and diversity of the wetland plant community, and the growth and nutrition of wetland plants. Affecting the composition, succession, and diversity of the wetland plant community, AM fungi have positive, negative, or neutral effects on the performance of different wetland species under different conditions. The factors that affect the application effect of AM fungi in constructed wetland （CW） include flooding, phosphorus, plant species, aerenchyma, salinity, CW types, operation modes of CW, and wastewater quality. The generalist AM fungi strains can be established spontaneously, rapidly, and extensively in wastewater bioremediation technical installations; therefore, AM fungi can be considered ideal inhabitants of technical installations for the plant-based bioremediation of groundwater contaminated by organic pollutants or other contaminants. In the future, roles of AM fungi and factors that affect the purifying capacity of AM-CW system must be understood to optimize CW ecosystem.展开更多
This paper presents an overview of the AMS thermal control system and its thermal environment on the ISS.We give examples of analysis and correlation of space environmental impacting on the thermal control system of A...This paper presents an overview of the AMS thermal control system and its thermal environment on the ISS.We give examples of analysis and correlation of space environmental impacting on the thermal control system of AMS.The most critical factors that affect the thermal environment to AMS are beta angle,attitude of ISS,ISS solar array and ISS radiator positions.The design of a special sandwich structure with embedded heat pipes provides the radiator with higher heat transfer ability for electronics and power crates,and it provides a large heat retaining capacity to balance the frequent changes of the space environment temperatures as well.In cold cases,the thermostatically controlled heaters are working actively to protect AMS.However,sometimes,because of ISS special operations plus extreme beta angle condition,AMS needs to request NASA to adjust the ISS configuration for thermal control.The AMS thermal control system is reliable and stable,which has been verified by its operation on the ISS for more than three years.All the detectors operate normally,the electronics and crates work within their specific temperature limits.展开更多
基金"973"National Key Basic Research and Development Program(No.2012CB518202)Project of Qinghai Development of Science and Technology(No.2011-N-150)
文摘The aim was to measure the incidence of high altitude headache （HAH） and to determine clinical features, as well as the relation between acute mountain sickness （AMS） and HAH through a prospective study. We conducted a questionnaire-based study among construction workers in Yushu after a serious earthquake ; they were under reconstruction using a structured questionnaire incorporating International Headache Society （IHS） and AMS Lake Louise Scoring System. A total of 608 workers were enrolled after their first ascent to altitudes of 3 750-4 528 m. The results showed that 96 % reported at least 1 HAil（median 3.8, range from 1 to 10） in workers at a mean altitude of 4 250 m. The magnitude of headache was divided as mild（38 %）, moderate （44 % ） and severe （18 %）. This study indicates that HAH is the most common symptom of acute altitude exposure and closely corre- lated with altitude （r=0.165, p〈0.001）. However, 52 % of headache was one of the main symptoms of AMS, while the other 48 % was the sole symptom of HAH. On the contrary we found that 2 % of AMS without headache, thus the ＂painless AMS＂ actually existed. The clinical features of HAH are presented, and the relationship between AMS and HAH is discussed.
基金supported by the National Natural Science Foundation of China (Nos. 31400435 and 31270573)the Fundamental Research Funds for the Central Universities of China (No. WUT2014-IV-050)the Natural Science Foundation of Hubei Province, China (No. 2015CFB596)
文摘Over the last three decades, the presence and functional roles of arbuscular mycorrhizal （AM） fungi in wetland habitats have received increasing attention. This review summarized the mycorrhizal status in wetlands and the effect of flooding on AM fungal colonization. Plants of 99 families living in 31 different habitats have been found to be associated with AM fungi, even including submerged aquatic plants and several plant species that were thought to be nonmycorrhizal （Cyperaceae, Chenopodiaceae, and Plumbaginaceac）. The functions of AM fungi in wetland ecological systems could be concluded as their influences on the composition, succession, and diversity of the wetland plant community, and the growth and nutrition of wetland plants. Affecting the composition, succession, and diversity of the wetland plant community, AM fungi have positive, negative, or neutral effects on the performance of different wetland species under different conditions. The factors that affect the application effect of AM fungi in constructed wetland （CW） include flooding, phosphorus, plant species, aerenchyma, salinity, CW types, operation modes of CW, and wastewater quality. The generalist AM fungi strains can be established spontaneously, rapidly, and extensively in wastewater bioremediation technical installations; therefore, AM fungi can be considered ideal inhabitants of technical installations for the plant-based bioremediation of groundwater contaminated by organic pollutants or other contaminants. In the future, roles of AM fungi and factors that affect the purifying capacity of AM-CW system must be understood to optimize CW ecosystem.
基金supported by the Shandong Province Outstanding Young Scientist Award Fund(Grant No.BS2013NJ026)the National Basic Research Program of China("973"Project)(Grant No.2013CB228305)
文摘This paper presents an overview of the AMS thermal control system and its thermal environment on the ISS.We give examples of analysis and correlation of space environmental impacting on the thermal control system of AMS.The most critical factors that affect the thermal environment to AMS are beta angle,attitude of ISS,ISS solar array and ISS radiator positions.The design of a special sandwich structure with embedded heat pipes provides the radiator with higher heat transfer ability for electronics and power crates,and it provides a large heat retaining capacity to balance the frequent changes of the space environment temperatures as well.In cold cases,the thermostatically controlled heaters are working actively to protect AMS.However,sometimes,because of ISS special operations plus extreme beta angle condition,AMS needs to request NASA to adjust the ISS configuration for thermal control.The AMS thermal control system is reliable and stable,which has been verified by its operation on the ISS for more than three years.All the detectors operate normally,the electronics and crates work within their specific temperature limits.
