The changes of structural and functional parameters of aquatic microbial communities in continuous water on campus of Tsinghua University, China are investigated by polyurethane foam unit(PFU) method. The measured com...The changes of structural and functional parameters of aquatic microbial communities in continuous water on campus of Tsinghua University, China are investigated by polyurethane foam unit(PFU) method. The measured compositions of the communities include alga, protozoa, and some metazoa(such as rotifers). The measured indicators of water quality include water temperature, pH value, dissolved oxygen(DO), potassium permanganate index(COD Mn ), total nitrogen(TN), total phosphorus(TP) and chlorophyll-a(Chla). The trophic level, expressed by the trophic level indices(TLIc), is assessed with analytic hierarchy process and principal component analysis(AHP-PCA) method. The changing trends of the structural and functional parameters of aquatic microbial communities, such as Margalef index of diversity(D), Shannon-weaver index of diversity (H), Heterotropy index(HI), number of species when the colonization gets equilibrium(S eq ), colonizing speed constant(G) and time spent when 90 percent of S eq colonized in PFU(T 90% ), are also analyzed. The experimental results showed the succession of aquatic microbial communities along the water flow is consistent with the water quality changes, so the parameters of microbial community can reflect the changes of water quality from the ecological view.展开更多
Objective: Sleep complaints are recurrent in Geriatrics and are often attributed to physiological aging. The aim of this work is to describe subjective sleep quality and its impact on successful aging. Methods: Subjec...Objective: Sleep complaints are recurrent in Geriatrics and are often attributed to physiological aging. The aim of this work is to describe subjective sleep quality and its impact on successful aging. Methods: Subjective sleep quality was evaluated by using the Pittsburgh subjective sleep quality questionnaire. Two visual analogical scales (graduate from 0 to 10) were used to quantify perceived state of health and life satisfaction. Objective respiratory sleep parameters were also collected. Results: 370 data were analysed (46.2% of males). The average age was 73.2 +/- 1. The level of perceived state of health was 6.9 +/- 2, and life satisfaction level was 7.7 +/-2. Subjective sleep quality was significantly related to perceived health status (p = 0.034) and life satisfaction (p = 0.005). There was no significant association between sleep quality and objective respiratory sleep parameters. Conclusion: The assessment of sleep quality plays an important role in the management of elderly persons and can help them to age more successfully.展开更多
文摘The changes of structural and functional parameters of aquatic microbial communities in continuous water on campus of Tsinghua University, China are investigated by polyurethane foam unit(PFU) method. The measured compositions of the communities include alga, protozoa, and some metazoa(such as rotifers). The measured indicators of water quality include water temperature, pH value, dissolved oxygen(DO), potassium permanganate index(COD Mn ), total nitrogen(TN), total phosphorus(TP) and chlorophyll-a(Chla). The trophic level, expressed by the trophic level indices(TLIc), is assessed with analytic hierarchy process and principal component analysis(AHP-PCA) method. The changing trends of the structural and functional parameters of aquatic microbial communities, such as Margalef index of diversity(D), Shannon-weaver index of diversity (H), Heterotropy index(HI), number of species when the colonization gets equilibrium(S eq ), colonizing speed constant(G) and time spent when 90 percent of S eq colonized in PFU(T 90% ), are also analyzed. The experimental results showed the succession of aquatic microbial communities along the water flow is consistent with the water quality changes, so the parameters of microbial community can reflect the changes of water quality from the ecological view.
文摘Objective: Sleep complaints are recurrent in Geriatrics and are often attributed to physiological aging. The aim of this work is to describe subjective sleep quality and its impact on successful aging. Methods: Subjective sleep quality was evaluated by using the Pittsburgh subjective sleep quality questionnaire. Two visual analogical scales (graduate from 0 to 10) were used to quantify perceived state of health and life satisfaction. Objective respiratory sleep parameters were also collected. Results: 370 data were analysed (46.2% of males). The average age was 73.2 +/- 1. The level of perceived state of health was 6.9 +/- 2, and life satisfaction level was 7.7 +/-2. Subjective sleep quality was significantly related to perceived health status (p = 0.034) and life satisfaction (p = 0.005). There was no significant association between sleep quality and objective respiratory sleep parameters. Conclusion: The assessment of sleep quality plays an important role in the management of elderly persons and can help them to age more successfully.
