The robust Mg-H bonds present in magnesium hydride(MgH_(2))hinder the dissociation of hydrogen molecules on MgH_(2),leading to suboptimal thermo dynamic and kinetic properties.Transition metals such as nickel(Ni)and N...The robust Mg-H bonds present in magnesium hydride(MgH_(2))hinder the dissociation of hydrogen molecules on MgH_(2),leading to suboptimal thermo dynamic and kinetic properties.Transition metals such as nickel(Ni)and Nb exhibit superior hydrogen absorption energies as compared to Mg.By integrating two-dimensional Nb_(n)C_(n-1)T_(x)-MXene(with a large specific surface area and strong hydrogen absorption capacity provided by Nb)with Ni clusters,we developed an effective catalyst for hydrogen adsorption in MgH_(2).This study focused on the synthesis of an efficient MXene-Nb_(2)CT_(x)composite containing nano Ni cluster to enhance the hydrogenation and dehydrogenation processes of the Mg/MgH_(2)system.The Txend groups(-F,-O)were found to interact with Ni to create Ni-F or Ni-O bonds,which subsequently engage with adjacent Ni atoms to form Ni-Ni bonds.This interaction facilitates the loading of Ni clusters onto Nb_(2)CT_(x)and mitigates the inhibitory effects of-F or-O on hydrogen adsorption and desorption in the Mg-based system.Consequently,Nb_(2)C and Ni operate synergistic ally to enhance hydrogen dissociation and weaken Mg-H bonds.Theoretical simulations revealed that the inclusion of the Nb_(2)C/Ni catalyst in an elongation of Mg-H bonds enhancehydrogen dissociation and weaken Mg-H bonds.Theoretical simulations revealed that the inclusion of the Nb_(2)C/Ni catalyst in an elongation of Mg-H bonds facilitate hydrogen molecule dissociation on the Nb_(2)C/Ni composite.Hydrogen storage performance assesments demonstrated that the Nb_(2)C/Ni catalyst efficiently catalyzed hydrogen absorption and desorption;specifically,the hydrogenation/dehydrogenation capacity of Nb_(2)C/Ni@MgH_(2)reachedca.5.0 wt%at 100℃,while at 200℃,the capacities for hydrogenation and dehydrogenation reached 7.0 wt%and6.0 wt%,respectively,within 6 min.展开更多
Mycoplasma gallisepticum HS strain(MG-HS)is a pathogen that causes chronic respiratory disease(CRD)in chicken,which is characterized by host respiratory inflammatory damage,brings huge economic losses to the poultry i...Mycoplasma gallisepticum HS strain(MG-HS)is a pathogen that causes chronic respiratory disease(CRD)in chicken,which is characterized by host respiratory inflammatory damage,brings huge economic losses to the poultry industry.Recently,emerging Chinese herbal medicines(CHM)have been used to treat CRD.This study was aimed to investigate the preventive and therapeutic effects and their potential mechanisms of Chinese herbal medicinal formulae(CHMF),which consisted of 10 kinds of Chinese herbal medicine including Scutellaria,Houttuynia cordate and licorice,on MGinduced CRD in chickens.With respect to the preventive effect,the results showed that CHMF could effectively recover the MG-induced decrease on body weight and feed conversion ratio.Histopathological analysis showed that both prevention and treatment of CHMF could significantly alleviate the severe respiratory inflammation induced by MG infection.Moreover,compared with the MG infection group,both the prevention groups and the treatment groups of CHMF could effectively reduce the expression of MG adhesion protein(p MGA1.2)to inhibit the proliferation of MG,and thus effectively inhibit the expression of MG-induced inflammatory factors interleukin-1β(IL-1β)and tumour necrosis factor-α(TNF-α).In summary,these findings confirm that CHMF can protect chickens from various tissue damage caused by MG infection and has no adverse effects on the performance of chickens in the short term.And its efficacy against MG is equal to or better than that of tiamulin.展开更多
基金financially supported by the Natural Science Foundation of Jiangsu Province of China(No.BK20210079)Xuzhou Science and Technology Project(No.KC23011)
文摘The robust Mg-H bonds present in magnesium hydride(MgH_(2))hinder the dissociation of hydrogen molecules on MgH_(2),leading to suboptimal thermo dynamic and kinetic properties.Transition metals such as nickel(Ni)and Nb exhibit superior hydrogen absorption energies as compared to Mg.By integrating two-dimensional Nb_(n)C_(n-1)T_(x)-MXene(with a large specific surface area and strong hydrogen absorption capacity provided by Nb)with Ni clusters,we developed an effective catalyst for hydrogen adsorption in MgH_(2).This study focused on the synthesis of an efficient MXene-Nb_(2)CT_(x)composite containing nano Ni cluster to enhance the hydrogenation and dehydrogenation processes of the Mg/MgH_(2)system.The Txend groups(-F,-O)were found to interact with Ni to create Ni-F or Ni-O bonds,which subsequently engage with adjacent Ni atoms to form Ni-Ni bonds.This interaction facilitates the loading of Ni clusters onto Nb_(2)CT_(x)and mitigates the inhibitory effects of-F or-O on hydrogen adsorption and desorption in the Mg-based system.Consequently,Nb_(2)C and Ni operate synergistic ally to enhance hydrogen dissociation and weaken Mg-H bonds.Theoretical simulations revealed that the inclusion of the Nb_(2)C/Ni catalyst in an elongation of Mg-H bonds enhancehydrogen dissociation and weaken Mg-H bonds.Theoretical simulations revealed that the inclusion of the Nb_(2)C/Ni catalyst in an elongation of Mg-H bonds facilitate hydrogen molecule dissociation on the Nb_(2)C/Ni composite.Hydrogen storage performance assesments demonstrated that the Nb_(2)C/Ni catalyst efficiently catalyzed hydrogen absorption and desorption;specifically,the hydrogenation/dehydrogenation capacity of Nb_(2)C/Ni@MgH_(2)reachedca.5.0 wt%at 100℃,while at 200℃,the capacities for hydrogenation and dehydrogenation reached 7.0 wt%and6.0 wt%,respectively,within 6 min.
基金supported by the National Natural Science Foundation of China(31972681)the National Key Research and Development Program of China(2017YFD0501500)。
文摘Mycoplasma gallisepticum HS strain(MG-HS)is a pathogen that causes chronic respiratory disease(CRD)in chicken,which is characterized by host respiratory inflammatory damage,brings huge economic losses to the poultry industry.Recently,emerging Chinese herbal medicines(CHM)have been used to treat CRD.This study was aimed to investigate the preventive and therapeutic effects and their potential mechanisms of Chinese herbal medicinal formulae(CHMF),which consisted of 10 kinds of Chinese herbal medicine including Scutellaria,Houttuynia cordate and licorice,on MGinduced CRD in chickens.With respect to the preventive effect,the results showed that CHMF could effectively recover the MG-induced decrease on body weight and feed conversion ratio.Histopathological analysis showed that both prevention and treatment of CHMF could significantly alleviate the severe respiratory inflammation induced by MG infection.Moreover,compared with the MG infection group,both the prevention groups and the treatment groups of CHMF could effectively reduce the expression of MG adhesion protein(p MGA1.2)to inhibit the proliferation of MG,and thus effectively inhibit the expression of MG-induced inflammatory factors interleukin-1β(IL-1β)and tumour necrosis factor-α(TNF-α).In summary,these findings confirm that CHMF can protect chickens from various tissue damage caused by MG infection and has no adverse effects on the performance of chickens in the short term.And its efficacy against MG is equal to or better than that of tiamulin.
