当前食源性致病菌导致的食品安全事故频发,特别是大肠杆菌O157:H7,通过合成NH_2-Fe_3O_4磁性颗粒,利用其带电性对大肠杆菌O157:H7进行富集,在优化富集条件的基础上,通过利用基质辅助激光解吸电离飞行时间质谱(matrix-assisted laser des...当前食源性致病菌导致的食品安全事故频发,特别是大肠杆菌O157:H7,通过合成NH_2-Fe_3O_4磁性颗粒,利用其带电性对大肠杆菌O157:H7进行富集,在优化富集条件的基础上,通过利用基质辅助激光解吸电离飞行时间质谱(matrix-assisted laser desorption/ionization time of flight mass spectrometry,MALDI-TOF MS)对其进行检测,验证该方法的检测限为3.5×10~3 CFU/m L,同时对模拟实际样本(碳酸饮料)中的大肠杆菌O157:H7进行检测,并搜索核糖体蛋白数据库鉴别了大肠杆菌O157:H7。展开更多
The magnetic measurements of the single crystal of Mn3 single-molecule magnet under high pressure at T=2 K have been performed.We find both the antiferromagnetic intermolecular coupling parameter J and the effective e...The magnetic measurements of the single crystal of Mn3 single-molecule magnet under high pressure at T=2 K have been performed.We find both the antiferromagnetic intermolecular coupling parameter J and the effective energy barrier to vary compared with the measurements at low pressure.The increase of|J|is estimated to be 12%at 0.7 GPa when compared with that of0 GPa,whereas the effective energy barrier becomes smaller with increasing pressure.Our results demonstrate that the intermolecular interaction of single-molecule magnet can be changed by pressure.Compared with the normal magnetic alloy,the effect of pressure on the magnetic properties of Mn3 is much more prominent,which implies that Mn3 may have great potential in magnetic multifunctional material.展开更多
文摘当前食源性致病菌导致的食品安全事故频发,特别是大肠杆菌O157:H7,通过合成NH_2-Fe_3O_4磁性颗粒,利用其带电性对大肠杆菌O157:H7进行富集,在优化富集条件的基础上,通过利用基质辅助激光解吸电离飞行时间质谱(matrix-assisted laser desorption/ionization time of flight mass spectrometry,MALDI-TOF MS)对其进行检测,验证该方法的检测限为3.5×10~3 CFU/m L,同时对模拟实际样本(碳酸饮料)中的大肠杆菌O157:H7进行检测,并搜索核糖体蛋白数据库鉴别了大肠杆菌O157:H7。
基金supported by the National Key Basic Research Program of China(Grant No.2011CB921702)the National Natural Science Foundation of China(Grant No.11104331)
文摘The magnetic measurements of the single crystal of Mn3 single-molecule magnet under high pressure at T=2 K have been performed.We find both the antiferromagnetic intermolecular coupling parameter J and the effective energy barrier to vary compared with the measurements at low pressure.The increase of|J|is estimated to be 12%at 0.7 GPa when compared with that of0 GPa,whereas the effective energy barrier becomes smaller with increasing pressure.Our results demonstrate that the intermolecular interaction of single-molecule magnet can be changed by pressure.Compared with the normal magnetic alloy,the effect of pressure on the magnetic properties of Mn3 is much more prominent,which implies that Mn3 may have great potential in magnetic multifunctional material.
