Selenium (Se) in the environment and food chains was greatlyrelated to animal deve- lopment and human health. Soils are the mainsources of Se in ecosystem. Numerous studies have been carried toinvestigate relationship...Selenium (Se) in the environment and food chains was greatlyrelated to animal deve- lopment and human health. Soils are the mainsources of Se in ecosystem. Numerous studies have been carried toinvestigate relationships between Se and S in soils. Xu (1992)reported that Se and S had similar chemical and physical propertiesso some factors influencing the uptake and toxicity of Se areattributed to the interaction of Se with S. Therefore, in order tocontrol and improve soil Se conditions, i.e., to reduce the Secontents of crops in Se-toxic soils or to increase the crop Secontents in Se-deficient soils by agricultural methods, S should beconsidered as an important factor.展开更多
An ion-exchange resin of type 201×7 was impregnated with the reagent 1-(2-Pyridylazo)-2-naphthol-6-sulphonic Acid (PAN-S). The adsorption characteristics of PAN-S resin for manganese ion were studied on the stati...An ion-exchange resin of type 201×7 was impregnated with the reagent 1-(2-Pyridylazo)-2-naphthol-6-sulphonic Acid (PAN-S). The adsorption characteristics of PAN-S resin for manganese ion were studied on the static equilibrium adsorption. Within temperature range of 288K^313K and the concentration range investigated, equilibrium data for the adsorption of manganese ions from aqueous solutions by PAN-S resin were obtained and correlated with Freundlich and Langmuir equation. The results showed that the process of the adsorption of manganese ions from aqueous solution by PAN-S was an exothermic process. Estimations of the isothermic enthalpy change of adsorption,free energy change and entropy of adsorption are reported,and the adsorption behaviors are reasonably interpreted.展开更多
The purpose of this investigation was to evaluate the effect of a dietary supplement （Mirigen TM）, a fungal cell wall derivative product, as a new generation alternative to antibiotics, on the growth and the innate ...The purpose of this investigation was to evaluate the effect of a dietary supplement （Mirigen TM）, a fungal cell wall derivative product, as a new generation alternative to antibiotics, on the growth and the innate and adaptive immune functions in broilers from birth to 45 d of age. Newborn chicken were randomly assigned to one of three groups： G 1 （n=150） controls no supplement fed; G2 （n=150） is fed with dietary supplement at a designed regular dose （0.5 %, weight of additive to food）; G3 （n= 150） is fed with dietary supplement at double doses （1%）. All three groups were housed in the same conditions. Body weight and blood were taken on day 1, 14, 28 and 45. Medications used and costs/treatment were recorded for each group. The whole blood was used to purify heterophils for reactive oxygen species （ROS） generation and E coli killing abilities examination assays, and the serum samples were preserved in freezer for enzyme linked immunosorbent assays （ELISAs） to determine concentration of macrophage inflammatory protein-1β （MIP-1β）, CD4/CD8, interferon-y （IFN-y）, and titers of antibody against Newcastle disease virus （NDV）. Group differences were analyzed using analysis of variance （ANOVA） algorithm （S-Plus）. There was no significant birth weight difference in three groups. After 45 d growth, the dietary supplement treated groups had significantly higher body weight gain （BWG） with lower mortality rate if compared to the untreated control group （P〈0.05）. Their BWG and mortality rate were 2.23 kg and 10 % in GI （control group）, 2.89 kg and 2 % in G2 （experimental group, 0.5 % dose）, and 2.77 kg and 1% in G3 （experimental group, 1% dose）, respectively. Heterophil ROS generation in treated groups were markedly improved through the addition of dietary supplement in both regular and double doses to the diet （P〈 0.05）. The ability of heterophil to kill E coli was also significantly improved in dietary supplement treated groups （P〈0.01）. Comparing to control group, there was significantly higher serum IFN-y concentration in treated groups （P〈0.05） on day 45. The CD4/CD8 was also improved in treated groups （P〈0.05）. Newcastle di-sease is the most prevalent avian disease, and vaccination is an effective method to protect the animals from the virus infection. In our study, it is found G2 and G3 that fed with dietary supplement had higher antibody titers against NDV after vaccination （P〈0.01） and the antibodies lasted longer. Results from this study demonstrated dietary supplement to broilers improved the immune capabilities of immune cells, which are vital to the establishment of immune response against pathogens, thereby, to improve chicken＇ s health and growth and reduce medication cost in chicken farming.展开更多
基金Project(No.00041405)supported by the Natural Science Foundation of Anhui Province,China
文摘Selenium (Se) in the environment and food chains was greatlyrelated to animal deve- lopment and human health. Soils are the mainsources of Se in ecosystem. Numerous studies have been carried toinvestigate relationships between Se and S in soils. Xu (1992)reported that Se and S had similar chemical and physical propertiesso some factors influencing the uptake and toxicity of Se areattributed to the interaction of Se with S. Therefore, in order tocontrol and improve soil Se conditions, i.e., to reduce the Secontents of crops in Se-toxic soils or to increase the crop Secontents in Se-deficient soils by agricultural methods, S should beconsidered as an important factor.
基金The Educational Bureau of Jiangsu Province, P. R. China (Grant Code 08KJD150009)Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection (Grant Code JLCBE07016)
文摘An ion-exchange resin of type 201×7 was impregnated with the reagent 1-(2-Pyridylazo)-2-naphthol-6-sulphonic Acid (PAN-S). The adsorption characteristics of PAN-S resin for manganese ion were studied on the static equilibrium adsorption. Within temperature range of 288K^313K and the concentration range investigated, equilibrium data for the adsorption of manganese ions from aqueous solutions by PAN-S resin were obtained and correlated with Freundlich and Langmuir equation. The results showed that the process of the adsorption of manganese ions from aqueous solution by PAN-S was an exothermic process. Estimations of the isothermic enthalpy change of adsorption,free energy change and entropy of adsorption are reported,and the adsorption behaviors are reasonably interpreted.
文摘The purpose of this investigation was to evaluate the effect of a dietary supplement （Mirigen TM）, a fungal cell wall derivative product, as a new generation alternative to antibiotics, on the growth and the innate and adaptive immune functions in broilers from birth to 45 d of age. Newborn chicken were randomly assigned to one of three groups： G 1 （n=150） controls no supplement fed; G2 （n=150） is fed with dietary supplement at a designed regular dose （0.5 %, weight of additive to food）; G3 （n= 150） is fed with dietary supplement at double doses （1%）. All three groups were housed in the same conditions. Body weight and blood were taken on day 1, 14, 28 and 45. Medications used and costs/treatment were recorded for each group. The whole blood was used to purify heterophils for reactive oxygen species （ROS） generation and E coli killing abilities examination assays, and the serum samples were preserved in freezer for enzyme linked immunosorbent assays （ELISAs） to determine concentration of macrophage inflammatory protein-1β （MIP-1β）, CD4/CD8, interferon-y （IFN-y）, and titers of antibody against Newcastle disease virus （NDV）. Group differences were analyzed using analysis of variance （ANOVA） algorithm （S-Plus）. There was no significant birth weight difference in three groups. After 45 d growth, the dietary supplement treated groups had significantly higher body weight gain （BWG） with lower mortality rate if compared to the untreated control group （P〈0.05）. Their BWG and mortality rate were 2.23 kg and 10 % in GI （control group）, 2.89 kg and 2 % in G2 （experimental group, 0.5 % dose）, and 2.77 kg and 1% in G3 （experimental group, 1% dose）, respectively. Heterophil ROS generation in treated groups were markedly improved through the addition of dietary supplement in both regular and double doses to the diet （P〈 0.05）. The ability of heterophil to kill E coli was also significantly improved in dietary supplement treated groups （P〈0.01）. Comparing to control group, there was significantly higher serum IFN-y concentration in treated groups （P〈0.05） on day 45. The CD4/CD8 was also improved in treated groups （P〈0.05）. Newcastle di-sease is the most prevalent avian disease, and vaccination is an effective method to protect the animals from the virus infection. In our study, it is found G2 and G3 that fed with dietary supplement had higher antibody titers against NDV after vaccination （P〈0.01） and the antibodies lasted longer. Results from this study demonstrated dietary supplement to broilers improved the immune capabilities of immune cells, which are vital to the establishment of immune response against pathogens, thereby, to improve chicken＇ s health and growth and reduce medication cost in chicken farming.
