Microbial flocculant （MBF） is a kind of novel flocculant, which is widely used for the food industry, highly concentrated organic waste water treatment and the urban water supply technology. Due to its characteristi...Microbial flocculant （MBF） is a kind of novel flocculant, which is widely used for the food industry, highly concentrated organic waste water treatment and the urban water supply technology. Due to its characteristics of superior flocculation effect, without secondary pollution to the environment and being easily degraded, MBF has been emerging as a hotspot of water treatment research in recent years. In this paper, the latest progress of the preparation of MBFs and the flocculating mechanism were presented. The practical application research of MBFs for water treatment was reviewed. Finally, suggestions and development prospect of research on MBFs were discussed.展开更多
The Shiwulihe River, the inflow river of Chaohu Lake in Hefei City, was taken as an example. Based on the current status of water quali- ty and analysis of pollution sources in the Shiwulihe River, countermeasures and...The Shiwulihe River, the inflow river of Chaohu Lake in Hefei City, was taken as an example. Based on the current status of water quali- ty and analysis of pollution sources in the Shiwulihe River, countermeasures and suggestions of controlling water pollution were proposed to provide effective ways for the control of water pollution and restoration of aquatic ecosystem in the Shiwulihe River and other similar rivers flowing into lakes.展开更多
Lysine-specific demethylase 1 （Lsdl） is associated with transcriptional coregulation via the modulation of histone methylation. The expression pattern and function of zebrafish Lsdl has not, however, been studied. H...Lysine-specific demethylase 1 （Lsdl） is associated with transcriptional coregulation via the modulation of histone methylation. The expression pattern and function of zebrafish Lsdl has not, however, been studied. Here, we describe the pattern of zebrafish Lsdl expression during different development stages. In the zebrafish embryo, Isdl mRNA was present during the early cleavage stage, indicating that maternally derived Lsdl protein is involved in embryonic patterning. During embryogenesis from 0 to 48 hours post-fertilization （hpf）, the expression of Isdl mRNA in the embryo was ubiquitous before 12 hpf and then became restricted to the antedor of the embryo （particularly in the brain） from 24 hpf to 72 hpf. Inhibition of Lsdl activity （by exposure to tranylcypromine） or knockdown of Isdl expression （by morpholino antisense oligonucleotide injection） led to the loss of cells in the brain and to a dramatic downregulatJon of neural genes, including gad65, gad75, and reelin, but not hey1. These findings indicate an important role of Lsdl during nervous system development in zebrafish.展开更多
GIS and GPS are used for the quantitative analysis of visual landscape impact of the old and new Cloud Valley Cableway in the Yellow Mountain.The results show that viewshed,quantity of visible sensitive scenic areas,a...GIS and GPS are used for the quantitative analysis of visual landscape impact of the old and new Cloud Valley Cableway in the Yellow Mountain.The results show that viewshed,quantity of visible sensitive scenic areas,and visible length from the tour routes of the new cableway are much smaller than those of the old one,so the new cableway has limited impact on visual landscapes of the scenic area,and basically meets the requirement of not damaging natural landscape features of the Yellow Mountain.GIS-and GPS-based spatial viewshed analysis methods have promising prospects in researches on landscape infl uence of scenic areas,and both of them are also signifi cant technical supports for the environmental protection verifi cation of construction projects in scenic areas.展开更多
To explore variation of dissolved inorganic carbon content( DIC) caused by cyanobacterial blooms and provide a basis for formulating effective preventive and control measures of cyanobacterial blooms,the concentration...To explore variation of dissolved inorganic carbon content( DIC) caused by cyanobacterial blooms and provide a basis for formulating effective preventive and control measures of cyanobacterial blooms,the concentration of inorganic carbon and the concentration of planktonic algae were studied by sampling method,and the distribution and variation of the DIC and physicochemical factors in the ecological restoration area of Fubao Bay of Dianchi Lake were analyzed. Results indicated that the distribution of chlorophyll-a was significantly positive correlated with CO_3^(2-)( P < 0. 01) and pH values( P < 0. 05); and the distribution of chlorophyll-a was significantly negative correlated with CO_2( P <0. 01),DIC and HCO_3^-( P < 0. 05). In conclusion,the outbreak and extinction of cyanobacterial blooms is one of the important reasons for the variation of inorganic carbon form and concentration.展开更多
[Objective] The study aimed to estimate the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer. [Method] Under static and dynamic conditions, we analyzed the release characteristics of...[Objective] The study aimed to estimate the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer. [Method] Under static and dynamic conditions, we analyzed the release characteristics of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer, and estimated the release flux of sediment phosphorus in the studied area in summer. [Result] Disturbance had great effects on the release of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer. When phosphorus concentration in overlying water was 0 mg/L, the amount of released phosphorus under dynamic conditions was 2.3 times as much as that under static conditions; as phosphorus concentration in overlying water was 0.05 mg/L, the amount of released phosphorus under dynamic conditions was 1.3 times as much as that under static condi- tions. In a word, the amount of released phosphorus under dynamic conditions was higher than that under static conditions. In summer, the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake was very high, namely 0.2 t/km2. Therefore, besides controlling exogenous phosphorus pollution, we should pay more attention to the release of sediment phosphorus. [ Conclusion] The research could provide theoretical ref- erences for dredging sediment and controlling lake eutrophication in future.展开更多
Fish are important food sources for humans,and the availability of appropriate amount of trace elements(TEs)plays a crucial role in fish growth.Currently,due to large volumes of sewage discharge,high levels of certain...Fish are important food sources for humans,and the availability of appropriate amount of trace elements(TEs)plays a crucial role in fish growth.Currently,due to large volumes of sewage discharge,high levels of certain elements are present in aquatic environments,and these elements accumulate in fish and potentially affect human health.In this study,the distribution and bioaccumulation capacity of trace elements in six dominant fish species from Chaohu Lake(China)were analyzed.The results showed that the bioaccumulation capacity of fish for Zn was greater than other TEs.And the source of the TEs in the fish were explored along with the concentration of the TEs in the aquatic environment,which indicated that TEs in fish were mainly obtained through ingestion and indirectly affected by the industrial activities in the basin.Additionally,stable carbon and nitrogen isotopes were used to classify the trophic levels and explore the biological magnification of TEs of the fish.It was found that Sb and Sr showed biomagnification with the increase of trophic level of fish.Based on the above analyses,the environmental biogeochemical cycle model of TEs in the lake was distinguished and established,which can offer valuable insights for sustainable fishery management in the downstream Yangtze River Delta ecosystem.展开更多
Based on combined CloudSat/CALIPSO detections, the seasonal occurrence of deep convective clouds （DCCs） over the midlatitude North Pacific （NP） and cyclonic activity in winter were compared. In winter, DCCs are mo...Based on combined CloudSat/CALIPSO detections, the seasonal occurrence of deep convective clouds （DCCs） over the midlatitude North Pacific （NP） and cyclonic activity in winter were compared. In winter, DCCs are more frequent over the central NP, from approximately 30~N to 45~N, than over other regions. The high frequencies are roughly equal to those occurring in this region in summer. Most of these DCCs have cloud tops above a 12 km altitude, and the highest top is approximately 15 km. These wintertime marine DCCs commonly occur during surface circulation conditions of low pressure, high temperature, strong meridional wind, and high relative humidity. Further, the maximum probability of DCCs, according to the high correlation coefficient, was found in the region 10^-20~ east and 5^-10~ south of the center of the cyclones. The potential relationship between DCCs and cyclones regarding their relative locations and circulation conditions was also identified by a case study. Deep clouds were generated in the warm conveyor belt by strong updrafts from baroclinic flows. The updrafts intensified when latent heat was released during the adjustment of the cyclone circulation current. This indicates that the dynamics of cyclones are the primary energy source for DCCs over the NP in winter.展开更多
Two series monot ailed porphyrins, Cobalt-5- {4- [ω- （1-adamant aneamino） alkyloxy] phenyl }- 10,15,20-triphenyl porphyrinate （CoPCnA, n=4,5,6） and Nickel-5-{4-[ω-（1-adamantaneamino）alkyloxy]phenyl}-10,15.20- ...Two series monot ailed porphyrins, Cobalt-5- {4- [ω- （1-adamant aneamino） alkyloxy] phenyl }- 10,15,20-triphenyl porphyrinate （CoPCnA, n=4,5,6） and Nickel-5-{4-[ω-（1-adamantaneamino）alkyloxy]phenyl}-10,15.20- triphenyl porphyrinate （NiPCnA, n=4,5,6）, were synthesized, in which the porphyrin moiety was connected to l-adamantanamine via a flexible hydrocarbon chain. The fluorescence quenching between these donor substrates and mono-6-p-nitrobenzoyl-β-cyclodextrin （NBCD） was studied in detail. Distinct fluorescence quenching occured in these supramolecular systems. This quenching was attributed to the photoinduced electron transfer （PET） inside the supramolecular assembly between the porphyrin donors and cyclodextrin acceptors. Detailed Stern-Volmer constants were measured and they were partitioned into dynamic Stern- Volmer quenching constants and static binding constants. It was demonstrated that the PET interaction between the porphyrin subunits and NBCD is indeed effective.展开更多
Congestion causes many externalities for the society, including time delays, excessive fuel consumption, air pollution, noise and safety concerns. In Shanghai, various policy options have been explored, piloted or app...Congestion causes many externalities for the society, including time delays, excessive fuel consumption, air pollution, noise and safety concerns. In Shanghai, various policy options have been explored, piloted or applied; however, not all of them may be understood and accepted by the public. A survey was conducted to investigate people＇s attitudes towards several policy options. The main findings reveal that Shanghai residents are resistant to certain policies, such as congestion charges, higher parking charges in congested areas and car restrictions. Instead, they favor public transport provisions. The paper suggests that there is a case for promoting public transport and more efficient trips when the car ownership is still low, and for investing in a policy of educating the public on the ＇true＇ costs and causes of congestion before embarking on ,an intensive policy of congestion charges or restrictions.展开更多
文摘Microbial flocculant （MBF） is a kind of novel flocculant, which is widely used for the food industry, highly concentrated organic waste water treatment and the urban water supply technology. Due to its characteristics of superior flocculation effect, without secondary pollution to the environment and being easily degraded, MBF has been emerging as a hotspot of water treatment research in recent years. In this paper, the latest progress of the preparation of MBFs and the flocculating mechanism were presented. The practical application research of MBFs for water treatment was reviewed. Finally, suggestions and development prospect of research on MBFs were discussed.
基金Supported by the National Science and Technology Project of Water Pollution Control and Management(2012ZX07103-004,2012ZX07103003-03)
文摘The Shiwulihe River, the inflow river of Chaohu Lake in Hefei City, was taken as an example. Based on the current status of water quali- ty and analysis of pollution sources in the Shiwulihe River, countermeasures and suggestions of controlling water pollution were proposed to provide effective ways for the control of water pollution and restoration of aquatic ecosystem in the Shiwulihe River and other similar rivers flowing into lakes.
基金the National Natural Science Foundation of China, No.81102643the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, No.10KJB310010+1 种基金the Science Foundationof Zhejiang Province, No.Y2100917the Science Foundation of Anhui Province, No.1208085MB26
文摘Lysine-specific demethylase 1 （Lsdl） is associated with transcriptional coregulation via the modulation of histone methylation. The expression pattern and function of zebrafish Lsdl has not, however, been studied. Here, we describe the pattern of zebrafish Lsdl expression during different development stages. In the zebrafish embryo, Isdl mRNA was present during the early cleavage stage, indicating that maternally derived Lsdl protein is involved in embryonic patterning. During embryogenesis from 0 to 48 hours post-fertilization （hpf）, the expression of Isdl mRNA in the embryo was ubiquitous before 12 hpf and then became restricted to the antedor of the embryo （particularly in the brain） from 24 hpf to 72 hpf. Inhibition of Lsdl activity （by exposure to tranylcypromine） or knockdown of Isdl expression （by morpholino antisense oligonucleotide injection） led to the loss of cells in the brain and to a dramatic downregulatJon of neural genes, including gad65, gad75, and reelin, but not hey1. These findings indicate an important role of Lsdl during nervous system development in zebrafish.
基金Sponsored by Anhui Soft Science Research Program(12020503053)
文摘GIS and GPS are used for the quantitative analysis of visual landscape impact of the old and new Cloud Valley Cableway in the Yellow Mountain.The results show that viewshed,quantity of visible sensitive scenic areas,and visible length from the tour routes of the new cableway are much smaller than those of the old one,so the new cableway has limited impact on visual landscapes of the scenic area,and basically meets the requirement of not damaging natural landscape features of the Yellow Mountain.GIS-and GPS-based spatial viewshed analysis methods have promising prospects in researches on landscape infl uence of scenic areas,and both of them are also signifi cant technical supports for the environmental protection verifi cation of construction projects in scenic areas.
基金Supported by the National Major Science and Technology Program for Water Pollution Control and Treatment(2012ZX07103-003 and 2012ZX07103-004)
文摘To explore variation of dissolved inorganic carbon content( DIC) caused by cyanobacterial blooms and provide a basis for formulating effective preventive and control measures of cyanobacterial blooms,the concentration of inorganic carbon and the concentration of planktonic algae were studied by sampling method,and the distribution and variation of the DIC and physicochemical factors in the ecological restoration area of Fubao Bay of Dianchi Lake were analyzed. Results indicated that the distribution of chlorophyll-a was significantly positive correlated with CO_3^(2-)( P < 0. 01) and pH values( P < 0. 05); and the distribution of chlorophyll-a was significantly negative correlated with CO_2( P <0. 01),DIC and HCO_3^-( P < 0. 05). In conclusion,the outbreak and extinction of cyanobacterial blooms is one of the important reasons for the variation of inorganic carbon form and concentration.
基金Supported by National Science and Technology Key Project of Water Pollution Control and Management(2008ZX07103-007)
文摘[Objective] The study aimed to estimate the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer. [Method] Under static and dynamic conditions, we analyzed the release characteristics of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer, and estimated the release flux of sediment phosphorus in the studied area in summer. [Result] Disturbance had great effects on the release of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer. When phosphorus concentration in overlying water was 0 mg/L, the amount of released phosphorus under dynamic conditions was 2.3 times as much as that under static conditions; as phosphorus concentration in overlying water was 0.05 mg/L, the amount of released phosphorus under dynamic conditions was 1.3 times as much as that under static condi- tions. In a word, the amount of released phosphorus under dynamic conditions was higher than that under static conditions. In summer, the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake was very high, namely 0.2 t/km2. Therefore, besides controlling exogenous phosphorus pollution, we should pay more attention to the release of sediment phosphorus. [ Conclusion] The research could provide theoretical ref- erences for dredging sediment and controlling lake eutrophication in future.
基金This work was supported by the Key Research and Development Program of Anhui Province(China)(No.2023t07020006)the National Natural Science Foundation of China(No.42272193)the Youth Project of Anhui Natural Science Foundation(China)(No.2108085QD161).
文摘Fish are important food sources for humans,and the availability of appropriate amount of trace elements(TEs)plays a crucial role in fish growth.Currently,due to large volumes of sewage discharge,high levels of certain elements are present in aquatic environments,and these elements accumulate in fish and potentially affect human health.In this study,the distribution and bioaccumulation capacity of trace elements in six dominant fish species from Chaohu Lake(China)were analyzed.The results showed that the bioaccumulation capacity of fish for Zn was greater than other TEs.And the source of the TEs in the fish were explored along with the concentration of the TEs in the aquatic environment,which indicated that TEs in fish were mainly obtained through ingestion and indirectly affected by the industrial activities in the basin.Additionally,stable carbon and nitrogen isotopes were used to classify the trophic levels and explore the biological magnification of TEs of the fish.It was found that Sb and Sr showed biomagnification with the increase of trophic level of fish.Based on the above analyses,the environmental biogeochemical cycle model of TEs in the lake was distinguished and established,which can offer valuable insights for sustainable fishery management in the downstream Yangtze River Delta ecosystem.
基金funded by the National Natural Science Foundation of China (Grant Nos. 41105031, 41230419, 91337213 and 41205126)the China Special Fund for Meteorological Research in the Public Interest (Grant Nos. GYHY201306017 and GYHY201306077)+2 种基金the Strategic Priority Research Program (Grant No. XDA05100303)the Major State Basic Research Development Program (Grant No. 2010CB428601)Environmental Public Welfare Scientific Research (Grant No. 201209006)
文摘Based on combined CloudSat/CALIPSO detections, the seasonal occurrence of deep convective clouds （DCCs） over the midlatitude North Pacific （NP） and cyclonic activity in winter were compared. In winter, DCCs are more frequent over the central NP, from approximately 30~N to 45~N, than over other regions. The high frequencies are roughly equal to those occurring in this region in summer. Most of these DCCs have cloud tops above a 12 km altitude, and the highest top is approximately 15 km. These wintertime marine DCCs commonly occur during surface circulation conditions of low pressure, high temperature, strong meridional wind, and high relative humidity. Further, the maximum probability of DCCs, according to the high correlation coefficient, was found in the region 10^-20~ east and 5^-10~ south of the center of the cyclones. The potential relationship between DCCs and cyclones regarding their relative locations and circulation conditions was also identified by a case study. Deep clouds were generated in the warm conveyor belt by strong updrafts from baroclinic flows. The updrafts intensified when latent heat was released during the adjustment of the cyclone circulation current. This indicates that the dynamics of cyclones are the primary energy source for DCCs over the NP in winter.
基金V. ACKN0WLEDGMENT This work was supported Science Foundation of China by the National Natural （No.20472079）.
文摘Two series monot ailed porphyrins, Cobalt-5- {4- [ω- （1-adamant aneamino） alkyloxy] phenyl }- 10,15,20-triphenyl porphyrinate （CoPCnA, n=4,5,6） and Nickel-5-{4-[ω-（1-adamantaneamino）alkyloxy]phenyl}-10,15.20- triphenyl porphyrinate （NiPCnA, n=4,5,6）, were synthesized, in which the porphyrin moiety was connected to l-adamantanamine via a flexible hydrocarbon chain. The fluorescence quenching between these donor substrates and mono-6-p-nitrobenzoyl-β-cyclodextrin （NBCD） was studied in detail. Distinct fluorescence quenching occured in these supramolecular systems. This quenching was attributed to the photoinduced electron transfer （PET） inside the supramolecular assembly between the porphyrin donors and cyclodextrin acceptors. Detailed Stern-Volmer constants were measured and they were partitioned into dynamic Stern- Volmer quenching constants and static binding constants. It was demonstrated that the PET interaction between the porphyrin subunits and NBCD is indeed effective.
文摘Congestion causes many externalities for the society, including time delays, excessive fuel consumption, air pollution, noise and safety concerns. In Shanghai, various policy options have been explored, piloted or applied; however, not all of them may be understood and accepted by the public. A survey was conducted to investigate people＇s attitudes towards several policy options. The main findings reveal that Shanghai residents are resistant to certain policies, such as congestion charges, higher parking charges in congested areas and car restrictions. Instead, they favor public transport provisions. The paper suggests that there is a case for promoting public transport and more efficient trips when the car ownership is still low, and for investing in a policy of educating the public on the ＇true＇ costs and causes of congestion before embarking on ,an intensive policy of congestion charges or restrictions.
