[Objective] The research aimed to study the morphological characteristics and karyotype of Pelteobagrus fulvidraco in Dongting Lake water system.[Method] By using the conventional biological morphometry,PHA and colchi...[Objective] The research aimed to study the morphological characteristics and karyotype of Pelteobagrus fulvidraco in Dongting Lake water system.[Method] By using the conventional biological morphometry,PHA and colchicine injection method in vivo,the morphological characteristics and karyotype of P.fulvidraco in Yuanshui River and Lishui River of Dongting Lake were analyzed.[Result] In three ratio traits including standard length/head length,standard length/caudal peduncle depth,head length/snout length,P.fulvidraco of Yuanshui River and Lishui River had significant differences(P0.05).However,the number and karyotype of their chromosomes were same.The chromosome number was 2n = 52,and the karyotype formula was 20M+12SM+10ST+10T.The number of chromosome arm was 84.[Conclusion] The research result had certain theoretical guidance significance for the protection and utilization of wild P.resource in Dongting Lake water system.展开更多
Enterovirus 71 (EV71) is a member of the Entero-virus genus of the Picomaviridae family and is the major cause of Hand, foot, and mouth disease (HFMD) in children. Different strains from Gansu were cloned and the ...Enterovirus 71 (EV71) is a member of the Entero-virus genus of the Picomaviridae family and is the major cause of Hand, foot, and mouth disease (HFMD) in children. Different strains from Gansu were cloned and the P1 protein was sequenced and analysed. Results indicate that there are three kinds of EV71 infections prevalent in Gansu. The VP 1 protein from one of these strains, 55F, was expressed. The recombinant protein was expressed with high level and reacted specifically with the EV71 patient antibody, the recombinant protein was also applied to raise antiserum in rabbits and after the fourth injection a high titer of antiserum was detected by ELISA assay. These data are useful for further clarification of prevalent EV71 strains in the north of China at the molecular level and provide a basis for EV71 diagnosis.展开更多
The species composition, horizontal distribution and seasonal succession of the phytoplankton at five sampling stations in the channel between Dongting Lake and the Changjiang River, China were studied from May 1995 t...The species composition, horizontal distribution and seasonal succession of the phytoplankton at five sampling stations in the channel between Dongting Lake and the Changjiang River, China were studied from May 1995 to December 1997. A total of 416 taxa were observed; diatoms comprised the most diverse taxonomic group representing 58.2 % of the total species. The β-mesotrophic indicators were 92 taxa or 22 % of the total, the α-mesotrophic or α,β-eutrophic indicators decreased distinctly to 20 taxa or 4.8 % of the total. The species number and composition of various phyla were approximately similar at Stations 1, 2, 3 and 4, but at Station 5 the number of species was the minimum and the ratio of diatoms to total phytoplankton in the number of species was the highest. In seasonal succession of the phytoplankton species, the number was the highest in May and June, lower in December, January, March and July in the channel. The dominant species were different in different months. The ratio of diatoms species number to blue green algae and green algae species number diminished gradually from winter to summer and autumn, and then increased gradually from autumn to winter and early spring in the annual cycle. Margalef, Simpson and Shannon-Weaver diversity indices changed in different months, their values were higher in winter, lower in summer. Nygaard’s diatoms quotients were lower in winter, then in spring and autumn, higher in summer. These results indicated that the water quality was the best in winter, better in spring and autumn than in summer. The relationship between the structure of the phytoplankton community and the water environmental quality was discussed.展开更多
The aim of the research was to obtain both an excellent effluent for reuse and a reduced sludge production simultaneously by a combination process of anaerobic phase and Membrane bioreactor (MBR) technology in treat...The aim of the research was to obtain both an excellent effluent for reuse and a reduced sludge production simultaneously by a combination process of anaerobic phase and Membrane bioreactor (MBR) technology in treating domestic wastewater. During the experimental period of three months, excellent removals for COD, NH3-H, TN were obtained, and mean removals were 91.87%, 96.13%, and 69. 23%, respectively. Whereas, at first 20 days, the removal for TP was only about 15.87%. In the following days, about 30% of raw water was introduced into the anaerobic reactor to supply organics for denitrificatien and release of polyphosphate, then a significant improvement for TP removal was observed, and mean removal of TP increased to 76.35%. During the operational period, it was investigated that the permeate could meet the requirements of several water criteria for reuse except free chlorine, and a mean excess sludge yield coefficient of 0.137 g MLSS/g COD was obtained. Therefore, the predicted goals of permeate for reuse and excess sludge reduction could be both achieved after dosing a certain quantity of disinfectant into the permeate.展开更多
This paper introduces a proposal for reservoir volume calculation in rainwater harvesting systems. The proposed method can be used for reservoir volume design in rainwater harvesting systems and is based on three impo...This paper introduces a proposal for reservoir volume calculation in rainwater harvesting systems. The proposed method can be used for reservoir volume design in rainwater harvesting systems and is based on three important variables. These variables are water demand, system efficiency and repayment time. Several simulations were carried out in different scenarios considering typical values of both catchment area (for low-income and medium-income households) and water demand, with fixed water and tank costs. Results showed that the integrated analysis of demand, efficiency and repayment time may assist designers to determine a more adequate reservoir volume.展开更多
Amylose is a food starch found in cereals, legumes and root vegetables. Keeping in view the importance of amylose for various food industries as well as its importance on domestic level, the current study was conducte...Amylose is a food starch found in cereals, legumes and root vegetables. Keeping in view the importance of amylose for various food industries as well as its importance on domestic level, the current study was conducted to analyze the amylose content of common cereals e. g rice (sela, coarse and basmati), maize yellow, Kisan and Azam varieties and wheat (Tatara, Fakhr-e-sarhad and Bakhtawar-92) varieties as well as quantifying the influence of cooking/boiling procedures on the amylose contents of cereals. The maximum amylose content were observed for wheat variety Tatara (24.28%) followed by Bakhtawar-92 (22.74%) and Fakhr-e-sarhad (19.77%). Among maize and rice varieties studied, Kisan and course rice were rich in amylose content with values of 27.19 and 30.48% respectively. The chapti of Tatra wheat were scored highest for appearance (7.6), flavor (7.5), texture (7.6) and overall acceptability (7.55). The roti of Kisan and Azam varieties got maximum appearance score of 7.6 as compared to 7.4 for maize yellow variety. Basmati rice was scored highest regarding appearance (8.4), flavor (8.6), texture (8.6) and overall acceptability (8.53. The moisture content ranged from 10.61 (Azam) to 8.01% (wheat variety Fakhr-e-sarhad). Cooking reduced the amylose content of wheat bread from (19.77%-24.28%) to (15.47%-15.94%) with cooking time of 5 min, maize bread from (21.48%-27.19%) to (19.53 %-25.85%) with maximum cooking time of 10 min and boiled rice from (24.90%-30.48%) to (24.18%-30.19%) with cooking time ranging from 12 to 20 min. It can be inferred from these studies that the reduction in amylose content were more in chapti/roti preparation of wheat and maize varieties as compared to boiling of rice varieties and that significant varietals differences exist in amylose content of the uncooked samples.展开更多
This paper analyzes the heavy rainstorm in northeast Dongting Lake on June 4, 2014. Results indicate the weather situation, radar echo and the satellite imagery of the strong precipitation. Besides, the warm and wet w...This paper analyzes the heavy rainstorm in northeast Dongting Lake on June 4, 2014. Results indicate the weather situation, radar echo and the satellite imagery of the strong precipitation. Besides, the warm and wet water vapor in Dongting Lake also contributes to this heavy rainstorm. As the astronomical precipitation cycle in this precipitation is outstanding, it is essential to pay attention to and use the astronomical precipitation forecast method.展开更多
This study examined the impact of farmers' health on labor data was collected through a field survey of 290 rural households productivity of female farmers in Imo State, Nigeria. Primary Descriptive statistics and es...This study examined the impact of farmers' health on labor data was collected through a field survey of 290 rural households productivity of female farmers in Imo State, Nigeria. Primary Descriptive statistics and estimation of efficiency following maximum likelihood estimation (MLE) procedure available in Frontier 4.1 were used to analyze the data. Results from the analyses showed that malaria has the highest prevalence level among female farmers in the study area followed by typhoid fever. The causes of sicknesses vary from cold, stress, mosquito bites and bad drinking water. Furthermore, the results showed that sicknesses affect the productivity of farmers by reducing their work capacity. Also, the distance to source of drinking water from home, source of drinking water, age, body mass index of farmers are also found to significantly affect the physical work output of farmers in the study area. The result shows that the distribution of farmers was highly skewed with about 99% of the farmers having their efficiency above 0.61. This indicates that majority of the farmers are technically efficient in the allocation of resources to crop production, The result also shows that the average efficiency was about 82.9%. Thus, the farmers' level of efficiency can be improved if there is a shift in the fi'ontier, i.e. if factors contributing to inefficiency are adequately controlled. The study recommends the need to invest more on human capital especially health for there to be an improvement in rural productivity. Also, rural development policies should include health policies especially for women since it has a great influence on the household and emphasis should also be on preventive rather than curative health services.展开更多
In this paper, two hypotheses are integrated into an independent model to explain consumer behavior. The model is empirically tested using data from China Family Cost Survey of 2001. The results indicate that China ho...In this paper, two hypotheses are integrated into an independent model to explain consumer behavior. The model is empirically tested using data from China Family Cost Survey of 2001. The results indicate that China household consumption behavior is commonly explained by two hypotheses as an independent model, reverse to previously treating them as commutative exclusive hypotheses.展开更多
On basis of aquatic and riverside-aquatic plants collection of O.V. fomina botanical garden is conducted research of ontogenesis, ecology, phenology, carpogenesis, biomorphology, life forms, adaptatations, of this gr...On basis of aquatic and riverside-aquatic plants collection of O.V. fomina botanical garden is conducted research of ontogenesis, ecology, phenology, carpogenesis, biomorphology, life forms, adaptatations, of this group's plants, peculiarities of their cultivation and application in conditions of temperate zone of Ukraine. Special values in research have ancient genera and species, which include representatives ofNymphaeaceae salisb, and trapaceae Dumort. families, 22 species, 6 varieties, 1 hybrid, 30 cultivars of which are presented in collection of garden in open and covered soil. For the first time in covered soil of two conservatories ecological modeling was conducted. Placement of plants is done in form of 5 models of artificial ecotopes, in 155 abatises. Four ecobiomorphological groups based on rhizome system were determined for Nymphaeaceae, among which conditionally-rhizome and conditionally-stolone are provided for the first time.展开更多
The research for sustainable poverty reduction for Khmer ethnic people in Tra Vinh province was conducted by the use of statistic approach, the current situation of poor households of Khmer ethnic people in Tra Vinh p...The research for sustainable poverty reduction for Khmer ethnic people in Tra Vinh province was conducted by the use of statistic approach, the current situation of poor households of Khmer ethnic people in Tra Vinh province, the interview with 300 Khmer households living in seven districts and cities of Tra Vinh province. Research findings show that there are a number of factors affecting the income of Khmer households, including the career of householders, the level of education, the ratio of dependants, living experience of the householders, the land square area, people's participation in different festivals; the number of household members, the number of activities for income and the gender of the householders. Of all the factors, occupation, level of education, and the ratio of dependants are considered to have the biggest influence on the income of Khmer ethnic people in Tra Vinh province.展开更多
In this paper, an econometric model for the aquatic products consumption of urban residents was established, aiming at investigating the different effects of seven factors (urban residents' annual disposable income,...In this paper, an econometric model for the aquatic products consumption of urban residents was established, aiming at investigating the different effects of seven factors (urban residents' annual disposable income, annual consumption quantity of pork and poultry and related byproducts, family structure, aging level, educational background, having meals out of home, and the number of retail chains stores) on the aquatic products consumption quantity of urban residents. The result of the model showed urban residents' annual disposable income and having meals out of home play the greatest effect on the consumption of aquatic products, followed by the number of retail chains stores; family structure plays a negative effect on the consumption of aquatic products. Also, the analysis shows not only the prices of the aquatic products as well as substitutes should be considered and also the quantity of the meals consumed by residents out of home and the number of retail chains stores should be used as important associated factors in studying the change trend of aquatic products consumption, and simultaneously the effect of family structure on the consumption quantity of aquatic products should be taken seriously, so that the aquatic products consumption of Chinese residents should be further promoted and also the aquatic products market can attain a development.展开更多
Indoor radon levels were measured in 221 homes in rented accommodation. In addition, buildings were registered for a series of variables describing building characteristics and used materials. The mean year value of t...Indoor radon levels were measured in 221 homes in rented accommodation. In addition, buildings were registered for a series of variables describing building characteristics and used materials. The mean year value of the indoor radon level was 30.7 (1~250) Bq/m3. The indoor radon level exceeded 100 Bq/m3 in 5.9% of the homes. Of the investigated variables, only homes in single-family terraced houses, were statistically significant. Approx: 75% of homes exceeding 100 Bq/m3 indoor radon level had levels between 100 and 200 Bq/m3 and 25% had indoor radon levels exceeding 200 Bq/m3. Significant differences in indoor radon levels were found in homes located in multi-occupant houses. Additionally, the risk of indoor radon levels exceeding 100 Bq/m3 in homes in multi-occupant houses was found to be very low, but the risk was the highest on the ground floor in a building constructed with slab on ground.展开更多
基金Supported by National Natural Science Foundation of China(30972260)Science and Technology Innovation Team Plan of Hunan Higher Education(2010)~~
文摘[Objective] The research aimed to study the morphological characteristics and karyotype of Pelteobagrus fulvidraco in Dongting Lake water system.[Method] By using the conventional biological morphometry,PHA and colchicine injection method in vivo,the morphological characteristics and karyotype of P.fulvidraco in Yuanshui River and Lishui River of Dongting Lake were analyzed.[Result] In three ratio traits including standard length/head length,standard length/caudal peduncle depth,head length/snout length,P.fulvidraco of Yuanshui River and Lishui River had significant differences(P0.05).However,the number and karyotype of their chromosomes were same.The chromosome number was 2n = 52,and the karyotype formula was 20M+12SM+10ST+10T.The number of chromosome arm was 84.[Conclusion] The research result had certain theoretical guidance significance for the protection and utilization of wild P.resource in Dongting Lake water system.
文摘Enterovirus 71 (EV71) is a member of the Entero-virus genus of the Picomaviridae family and is the major cause of Hand, foot, and mouth disease (HFMD) in children. Different strains from Gansu were cloned and the P1 protein was sequenced and analysed. Results indicate that there are three kinds of EV71 infections prevalent in Gansu. The VP 1 protein from one of these strains, 55F, was expressed. The recombinant protein was expressed with high level and reacted specifically with the EV71 patient antibody, the recombinant protein was also applied to raise antiserum in rabbits and after the fourth injection a high titer of antiserum was detected by ELISA assay. These data are useful for further clarification of prevalent EV71 strains in the north of China at the molecular level and provide a basis for EV71 diagnosis.
文摘The species composition, horizontal distribution and seasonal succession of the phytoplankton at five sampling stations in the channel between Dongting Lake and the Changjiang River, China were studied from May 1995 to December 1997. A total of 416 taxa were observed; diatoms comprised the most diverse taxonomic group representing 58.2 % of the total species. The β-mesotrophic indicators were 92 taxa or 22 % of the total, the α-mesotrophic or α,β-eutrophic indicators decreased distinctly to 20 taxa or 4.8 % of the total. The species number and composition of various phyla were approximately similar at Stations 1, 2, 3 and 4, but at Station 5 the number of species was the minimum and the ratio of diatoms to total phytoplankton in the number of species was the highest. In seasonal succession of the phytoplankton species, the number was the highest in May and June, lower in December, January, March and July in the channel. The dominant species were different in different months. The ratio of diatoms species number to blue green algae and green algae species number diminished gradually from winter to summer and autumn, and then increased gradually from autumn to winter and early spring in the annual cycle. Margalef, Simpson and Shannon-Weaver diversity indices changed in different months, their values were higher in winter, lower in summer. Nygaard’s diatoms quotients were lower in winter, then in spring and autumn, higher in summer. These results indicated that the water quality was the best in winter, better in spring and autumn than in summer. The relationship between the structure of the phytoplankton community and the water environmental quality was discussed.
文摘The aim of the research was to obtain both an excellent effluent for reuse and a reduced sludge production simultaneously by a combination process of anaerobic phase and Membrane bioreactor (MBR) technology in treating domestic wastewater. During the experimental period of three months, excellent removals for COD, NH3-H, TN were obtained, and mean removals were 91.87%, 96.13%, and 69. 23%, respectively. Whereas, at first 20 days, the removal for TP was only about 15.87%. In the following days, about 30% of raw water was introduced into the anaerobic reactor to supply organics for denitrificatien and release of polyphosphate, then a significant improvement for TP removal was observed, and mean removal of TP increased to 76.35%. During the operational period, it was investigated that the permeate could meet the requirements of several water criteria for reuse except free chlorine, and a mean excess sludge yield coefficient of 0.137 g MLSS/g COD was obtained. Therefore, the predicted goals of permeate for reuse and excess sludge reduction could be both achieved after dosing a certain quantity of disinfectant into the permeate.
文摘This paper introduces a proposal for reservoir volume calculation in rainwater harvesting systems. The proposed method can be used for reservoir volume design in rainwater harvesting systems and is based on three important variables. These variables are water demand, system efficiency and repayment time. Several simulations were carried out in different scenarios considering typical values of both catchment area (for low-income and medium-income households) and water demand, with fixed water and tank costs. Results showed that the integrated analysis of demand, efficiency and repayment time may assist designers to determine a more adequate reservoir volume.
文摘Amylose is a food starch found in cereals, legumes and root vegetables. Keeping in view the importance of amylose for various food industries as well as its importance on domestic level, the current study was conducted to analyze the amylose content of common cereals e. g rice (sela, coarse and basmati), maize yellow, Kisan and Azam varieties and wheat (Tatara, Fakhr-e-sarhad and Bakhtawar-92) varieties as well as quantifying the influence of cooking/boiling procedures on the amylose contents of cereals. The maximum amylose content were observed for wheat variety Tatara (24.28%) followed by Bakhtawar-92 (22.74%) and Fakhr-e-sarhad (19.77%). Among maize and rice varieties studied, Kisan and course rice were rich in amylose content with values of 27.19 and 30.48% respectively. The chapti of Tatra wheat were scored highest for appearance (7.6), flavor (7.5), texture (7.6) and overall acceptability (7.55). The roti of Kisan and Azam varieties got maximum appearance score of 7.6 as compared to 7.4 for maize yellow variety. Basmati rice was scored highest regarding appearance (8.4), flavor (8.6), texture (8.6) and overall acceptability (8.53. The moisture content ranged from 10.61 (Azam) to 8.01% (wheat variety Fakhr-e-sarhad). Cooking reduced the amylose content of wheat bread from (19.77%-24.28%) to (15.47%-15.94%) with cooking time of 5 min, maize bread from (21.48%-27.19%) to (19.53 %-25.85%) with maximum cooking time of 10 min and boiled rice from (24.90%-30.48%) to (24.18%-30.19%) with cooking time ranging from 12 to 20 min. It can be inferred from these studies that the reduction in amylose content were more in chapti/roti preparation of wheat and maize varieties as compared to boiling of rice varieties and that significant varietals differences exist in amylose content of the uncooked samples.
基金Supported by the"Short,Cheap,Fast"Subject of Hunan Meteorological Bureau in 2011(No.023)~~
文摘This paper analyzes the heavy rainstorm in northeast Dongting Lake on June 4, 2014. Results indicate the weather situation, radar echo and the satellite imagery of the strong precipitation. Besides, the warm and wet water vapor in Dongting Lake also contributes to this heavy rainstorm. As the astronomical precipitation cycle in this precipitation is outstanding, it is essential to pay attention to and use the astronomical precipitation forecast method.
文摘This study examined the impact of farmers' health on labor data was collected through a field survey of 290 rural households productivity of female farmers in Imo State, Nigeria. Primary Descriptive statistics and estimation of efficiency following maximum likelihood estimation (MLE) procedure available in Frontier 4.1 were used to analyze the data. Results from the analyses showed that malaria has the highest prevalence level among female farmers in the study area followed by typhoid fever. The causes of sicknesses vary from cold, stress, mosquito bites and bad drinking water. Furthermore, the results showed that sicknesses affect the productivity of farmers by reducing their work capacity. Also, the distance to source of drinking water from home, source of drinking water, age, body mass index of farmers are also found to significantly affect the physical work output of farmers in the study area. The result shows that the distribution of farmers was highly skewed with about 99% of the farmers having their efficiency above 0.61. This indicates that majority of the farmers are technically efficient in the allocation of resources to crop production, The result also shows that the average efficiency was about 82.9%. Thus, the farmers' level of efficiency can be improved if there is a shift in the fi'ontier, i.e. if factors contributing to inefficiency are adequately controlled. The study recommends the need to invest more on human capital especially health for there to be an improvement in rural productivity. Also, rural development policies should include health policies especially for women since it has a great influence on the household and emphasis should also be on preventive rather than curative health services.
文摘In this paper, two hypotheses are integrated into an independent model to explain consumer behavior. The model is empirically tested using data from China Family Cost Survey of 2001. The results indicate that China household consumption behavior is commonly explained by two hypotheses as an independent model, reverse to previously treating them as commutative exclusive hypotheses.
文摘On basis of aquatic and riverside-aquatic plants collection of O.V. fomina botanical garden is conducted research of ontogenesis, ecology, phenology, carpogenesis, biomorphology, life forms, adaptatations, of this group's plants, peculiarities of their cultivation and application in conditions of temperate zone of Ukraine. Special values in research have ancient genera and species, which include representatives ofNymphaeaceae salisb, and trapaceae Dumort. families, 22 species, 6 varieties, 1 hybrid, 30 cultivars of which are presented in collection of garden in open and covered soil. For the first time in covered soil of two conservatories ecological modeling was conducted. Placement of plants is done in form of 5 models of artificial ecotopes, in 155 abatises. Four ecobiomorphological groups based on rhizome system were determined for Nymphaeaceae, among which conditionally-rhizome and conditionally-stolone are provided for the first time.
文摘The research for sustainable poverty reduction for Khmer ethnic people in Tra Vinh province was conducted by the use of statistic approach, the current situation of poor households of Khmer ethnic people in Tra Vinh province, the interview with 300 Khmer households living in seven districts and cities of Tra Vinh province. Research findings show that there are a number of factors affecting the income of Khmer households, including the career of householders, the level of education, the ratio of dependants, living experience of the householders, the land square area, people's participation in different festivals; the number of household members, the number of activities for income and the gender of the householders. Of all the factors, occupation, level of education, and the ratio of dependants are considered to have the biggest influence on the income of Khmer ethnic people in Tra Vinh province.
文摘In this paper, an econometric model for the aquatic products consumption of urban residents was established, aiming at investigating the different effects of seven factors (urban residents' annual disposable income, annual consumption quantity of pork and poultry and related byproducts, family structure, aging level, educational background, having meals out of home, and the number of retail chains stores) on the aquatic products consumption quantity of urban residents. The result of the model showed urban residents' annual disposable income and having meals out of home play the greatest effect on the consumption of aquatic products, followed by the number of retail chains stores; family structure plays a negative effect on the consumption of aquatic products. Also, the analysis shows not only the prices of the aquatic products as well as substitutes should be considered and also the quantity of the meals consumed by residents out of home and the number of retail chains stores should be used as important associated factors in studying the change trend of aquatic products consumption, and simultaneously the effect of family structure on the consumption quantity of aquatic products should be taken seriously, so that the aquatic products consumption of Chinese residents should be further promoted and also the aquatic products market can attain a development.
文摘Indoor radon levels were measured in 221 homes in rented accommodation. In addition, buildings were registered for a series of variables describing building characteristics and used materials. The mean year value of the indoor radon level was 30.7 (1~250) Bq/m3. The indoor radon level exceeded 100 Bq/m3 in 5.9% of the homes. Of the investigated variables, only homes in single-family terraced houses, were statistically significant. Approx: 75% of homes exceeding 100 Bq/m3 indoor radon level had levels between 100 and 200 Bq/m3 and 25% had indoor radon levels exceeding 200 Bq/m3. Significant differences in indoor radon levels were found in homes located in multi-occupant houses. Additionally, the risk of indoor radon levels exceeding 100 Bq/m3 in homes in multi-occupant houses was found to be very low, but the risk was the highest on the ground floor in a building constructed with slab on ground.