Sedum alfredii Hance has been identified as zinc(Zn) and cadmium(Cd) co-hyperaccumulator.In this paper the relationships of Zn or Cd hyperaccumulation to the generation and the role of H2O2 in Sedum alfredii H.were ex...Sedum alfredii Hance has been identified as zinc(Zn) and cadmium(Cd) co-hyperaccumulator.In this paper the relationships of Zn or Cd hyperaccumulation to the generation and the role of H2O2 in Sedum alfredii H.were examined.The results show that Zn and Cd contents in the shoots of Sedum alfredii H.treated with 1000 μmol/L Zn2+ and/or 200 μmol/L Cd2+ increased linearly within 15 d.Contents of total S,glutathione(GSH) and H2O2 in shoots also increased within 15 d,and then decreased.Total S and GSH contents in shoots were higher under Cd2+ treatment than under Zn2+ treatment.However,reverse trends of H2O2 content in shoots were obtained,in which much higher H2O2 content was observed in Zn2+-treated shoots than in Cd2+-treated shoots.Similarly,the microscopic imaging of H2O2 accumulation in leaves using H2O2 probe technique showed that much higher H2O2 accumulation was observed in the Zn2+-treated leaf than in the Cd2+-treated one.These results suggest that there are different responses in the generation of H2O2 upon exposure to Zn2+ and Cd2+ for the hyperaccumulator Sedum alfredii H.And this is the first report that the generation of H2O2 may play an important role in Zn hyperaccumulation in the leaves.Our results also imply that GSH may play an important role in the detoxification of dissociated Zn/Cd and the generation of H2O2.展开更多
Ecological restoration is widely employed from tens to millions of hectares in space,and from tens of days to thousands of years in time, which forces consideration of it thoroughly. We argue that three questions are ...Ecological restoration is widely employed from tens to millions of hectares in space,and from tens of days to thousands of years in time, which forces consideration of it thoroughly. We argue that three questions are the most important among the contents relevant of ecological restoration, including why, what and how to restore degraded systems. Why to restore determines whether or not the degraded ecological systems should be restored. What to restore is the goal of ecological restoration. The explicit goal of ecological restoration is necessary to guide ecological restoration workers in pursuit of excellence and prevent restoration from being swamped by purely technological activities. And how to restore means the methods and steps we should apply. To ensure the final success of ecological restoration, restored sites should be monitored and managed for long time to determine whether the selected methods are appropriate, and can be remedy better. Only to deal with these effectively, ecological restoration would be the hope for the future.展开更多
Many unicellular cyanobacteria were isolated from different places： fields, ponds, polluted water, and soils from Muredkey and Kasur tannery areas, near Lahore, Pakistan. Different media like BG 11 medium, Bold Basal...Many unicellular cyanobacteria were isolated from different places： fields, ponds, polluted water, and soils from Muredkey and Kasur tannery areas, near Lahore, Pakistan. Different media like BG 11 medium, Bold Basal medium, Chu＇s # 10 medium and Gotham＇s medium, in standard forms and with slight variations of ingredients, and different pH, temperature and light regimes were checked for the optimum growth of the isolates. The isolation pro- cedure was repeated with different concentrations of chromium to select the resistant strains. These selected strains grew on chromium of the range 100-200 μg/ml in BG 11 medium. Cyanobacteria were maintained in solid and liquid media with/without shaking. Cyanobacterial strains were collected from natural habitats that were accompanied by a diversified group of organisms including bacteria, protozoan, and rotifers etc. In order to eliminate these agents termed as contaminants, we used several methods including phenol treatment, use of antibiotic and careful manual picking of unicellular cyanobacteria. Resistance of these strains against different heavy metals （ZnSO4, MnSO4, NiSO4, COCl2, Pb（NO3）3, CuSO4, HgCl2, AgNO3 and CdCl2） and antibiotics （erythromycin, streptomycin, kanamycin, chloramphenicol, neomycin） was evaluated. Optimum temperature was 30℃ with variable pH for the reduction of Cr^6＋ in to Cr^3＋ in majority of strains.展开更多
In order to improve the use efficiency of environmental data intbrmation which has existed and to be produced, correctly control the situation of the regional environmental pollution, and supervise the regional en...In order to improve the use efficiency of environmental data intbrmation which has existed and to be produced, correctly control the situation of the regional environmental pollution, and supervise the regional environmental pollution recovery and urban planning, the paper crests the main-elements analysis module based on Super-Map GIS, beyond which, using the information of environmental pollution discharge data of some typical areas of Beijing. The paper analyses those representative regional environmental discharge data by the systemic main-clements analysis module, speedily discoveries and explains the regional environmental major control factors in the studying region. According to the special points of social, economical and environmental in the region, the paper gives out the improvement policies of regional environmental quality and practicable environmental engineering disposed project. This research not only indicates the development direction of the urban environmental management, but also builds up a main frame of the urban environmental planning. This paper and its relative works provide an efficiently digital management tool for the urban regional environmental management and explore the feasible method and mode for the improvement of urban regional environmental quality.展开更多
Patient safety has become a priority for the health system, including dentistry. Several studies showed that health care meant to improve people＇s health is an important source of disease. Good clinical practices aim...Patient safety has become a priority for the health system, including dentistry. Several studies showed that health care meant to improve people＇s health is an important source of disease. Good clinical practices aim to maximize effectiveness and therapeutic compliance, minimize risks and costs, respecting the patient＇s choice from generic drugs, also from the moment of prescribing, the supervision of drug-related events must be taken into account, not only on the patient but also in the environment. Pharmacovigilance and pharmacoecovigilance have to be conceived as a clinical practice in dentistry. There is no established culture of drug induced reaction reports by dentists in Uruguay, and awareness of environmental care is incipient. The pharmacy of faculty of dentistry, （Universidad de la Repfiblica）, an institutional project that has been developed since 2006, is in a transformation process. The pharmacovigilance dentistry Node is in full development. The toxicovigilance and pharmacoecovigilance activities are recent. The general aim of this project was to establish the pbarmacovigilance, toxicovigilance and pharmacoecovigilance clinical practice in dentistry. The widespread use of cosmetic as toothpastes, or mouth rinses, drugs and dental materials, as well as exposure to chemical contaminants through the population＇s living habits and the environmental damage caused by drug wastes requires comprehensive and up-to-date information to establish rational strategies.展开更多
In this work, we construct a stage-structured single population system with winter hiber- nation and impulsive effect in polluted environment. All solutions of the investigated system are proved to be uniformly ultima...In this work, we construct a stage-structured single population system with winter hiber- nation and impulsive effect in polluted environment. All solutions of the investigated system are proved to be uniformly ultimately bounded. The conditions of the population- extinction solution of the investigated system are obtained. The permanent condition of the investigated system is also obtained. Finally, numerical analysis is inserted to illustrate the results. Our results indicate that the environmental pollution will reduce biological diversity of the natural world. Our results also provide reliable tactic basis for the practical biological resource management.展开更多
基金Project (Nos. 30630046 and 20777068) supported by the National Natural Science Foundation of China
文摘Sedum alfredii Hance has been identified as zinc(Zn) and cadmium(Cd) co-hyperaccumulator.In this paper the relationships of Zn or Cd hyperaccumulation to the generation and the role of H2O2 in Sedum alfredii H.were examined.The results show that Zn and Cd contents in the shoots of Sedum alfredii H.treated with 1000 μmol/L Zn2+ and/or 200 μmol/L Cd2+ increased linearly within 15 d.Contents of total S,glutathione(GSH) and H2O2 in shoots also increased within 15 d,and then decreased.Total S and GSH contents in shoots were higher under Cd2+ treatment than under Zn2+ treatment.However,reverse trends of H2O2 content in shoots were obtained,in which much higher H2O2 content was observed in Zn2+-treated shoots than in Cd2+-treated shoots.Similarly,the microscopic imaging of H2O2 accumulation in leaves using H2O2 probe technique showed that much higher H2O2 accumulation was observed in the Zn2+-treated leaf than in the Cd2+-treated one.These results suggest that there are different responses in the generation of H2O2 upon exposure to Zn2+ and Cd2+ for the hyperaccumulator Sedum alfredii H.And this is the first report that the generation of H2O2 may play an important role in Zn hyperaccumulation in the leaves.Our results also imply that GSH may play an important role in the detoxification of dissociated Zn/Cd and the generation of H2O2.
基金UndertheauspicesoftheNationalNaturalScienceFoundationof China (No.4033100830270225)
文摘Ecological restoration is widely employed from tens to millions of hectares in space,and from tens of days to thousands of years in time, which forces consideration of it thoroughly. We argue that three questions are the most important among the contents relevant of ecological restoration, including why, what and how to restore degraded systems. Why to restore determines whether or not the degraded ecological systems should be restored. What to restore is the goal of ecological restoration. The explicit goal of ecological restoration is necessary to guide ecological restoration workers in pursuit of excellence and prevent restoration from being swamped by purely technological activities. And how to restore means the methods and steps we should apply. To ensure the final success of ecological restoration, restored sites should be monitored and managed for long time to determine whether the selected methods are appropriate, and can be remedy better. Only to deal with these effectively, ecological restoration would be the hope for the future.
文摘Many unicellular cyanobacteria were isolated from different places： fields, ponds, polluted water, and soils from Muredkey and Kasur tannery areas, near Lahore, Pakistan. Different media like BG 11 medium, Bold Basal medium, Chu＇s # 10 medium and Gotham＇s medium, in standard forms and with slight variations of ingredients, and different pH, temperature and light regimes were checked for the optimum growth of the isolates. The isolation pro- cedure was repeated with different concentrations of chromium to select the resistant strains. These selected strains grew on chromium of the range 100-200 μg/ml in BG 11 medium. Cyanobacteria were maintained in solid and liquid media with/without shaking. Cyanobacterial strains were collected from natural habitats that were accompanied by a diversified group of organisms including bacteria, protozoan, and rotifers etc. In order to eliminate these agents termed as contaminants, we used several methods including phenol treatment, use of antibiotic and careful manual picking of unicellular cyanobacteria. Resistance of these strains against different heavy metals （ZnSO4, MnSO4, NiSO4, COCl2, Pb（NO3）3, CuSO4, HgCl2, AgNO3 and CdCl2） and antibiotics （erythromycin, streptomycin, kanamycin, chloramphenicol, neomycin） was evaluated. Optimum temperature was 30℃ with variable pH for the reduction of Cr^6＋ in to Cr^3＋ in majority of strains.
文摘In order to improve the use efficiency of environmental data intbrmation which has existed and to be produced, correctly control the situation of the regional environmental pollution, and supervise the regional environmental pollution recovery and urban planning, the paper crests the main-elements analysis module based on Super-Map GIS, beyond which, using the information of environmental pollution discharge data of some typical areas of Beijing. The paper analyses those representative regional environmental discharge data by the systemic main-clements analysis module, speedily discoveries and explains the regional environmental major control factors in the studying region. According to the special points of social, economical and environmental in the region, the paper gives out the improvement policies of regional environmental quality and practicable environmental engineering disposed project. This research not only indicates the development direction of the urban environmental management, but also builds up a main frame of the urban environmental planning. This paper and its relative works provide an efficiently digital management tool for the urban regional environmental management and explore the feasible method and mode for the improvement of urban regional environmental quality.
文摘Patient safety has become a priority for the health system, including dentistry. Several studies showed that health care meant to improve people＇s health is an important source of disease. Good clinical practices aim to maximize effectiveness and therapeutic compliance, minimize risks and costs, respecting the patient＇s choice from generic drugs, also from the moment of prescribing, the supervision of drug-related events must be taken into account, not only on the patient but also in the environment. Pharmacovigilance and pharmacoecovigilance have to be conceived as a clinical practice in dentistry. There is no established culture of drug induced reaction reports by dentists in Uruguay, and awareness of environmental care is incipient. The pharmacy of faculty of dentistry, （Universidad de la Repfiblica）, an institutional project that has been developed since 2006, is in a transformation process. The pharmacovigilance dentistry Node is in full development. The toxicovigilance and pharmacoecovigilance activities are recent. The general aim of this project was to establish the pbarmacovigilance, toxicovigilance and pharmacoecovigilance clinical practice in dentistry. The widespread use of cosmetic as toothpastes, or mouth rinses, drugs and dental materials, as well as exposure to chemical contaminants through the population＇s living habits and the environmental damage caused by drug wastes requires comprehensive and up-to-date information to establish rational strategies.
基金Acknowledgments The work of the first author was supported by National Natural Science Foundation of China （No. 11361014） and the project of high level creative talents in Guizhou Province （No. 20164035）. This research was supported by National Natural Science Foundation of China （Nos. 11361014, 10961008）, the Science Technology Foundation of Guizhou Education Department （No. 2008038）, and the Science Technology Foundation of Guizhou （No. 2010J2130）.
文摘In this work, we construct a stage-structured single population system with winter hiber- nation and impulsive effect in polluted environment. All solutions of the investigated system are proved to be uniformly ultimately bounded. The conditions of the population- extinction solution of the investigated system are obtained. The permanent condition of the investigated system is also obtained. Finally, numerical analysis is inserted to illustrate the results. Our results indicate that the environmental pollution will reduce biological diversity of the natural world. Our results also provide reliable tactic basis for the practical biological resource management.
