猪塞内加谷病毒(Seneca Valley virus,SVV)是一种新出现的可感染仔猪及母猪并导致仔猪死亡的病毒。2015年3月份至今年在我国、巴西及美国出现了几起塞内加谷病毒感染猪群并伴随严重的临床症状及发病死亡的疫情,造成严重的经济损失。为...猪塞内加谷病毒(Seneca Valley virus,SVV)是一种新出现的可感染仔猪及母猪并导致仔猪死亡的病毒。2015年3月份至今年在我国、巴西及美国出现了几起塞内加谷病毒感染猪群并伴随严重的临床症状及发病死亡的疫情,造成严重的经济损失。为分离鉴定SVV,本研究将RT-PCR检测为SVV阳性的猪临床样品无菌处理后接种PK-15细胞,连续传代培养。通过细胞病变、RT-PCR扩增、电镜观察和基因序列测定对细胞培养物进行鉴定。结果表明我们成功分离到国内首株SVV,并将其命名为SVV CH-01-2015。全基因组的系统发育分析表明SVV CH-01-2015位于Senecavirus病毒属,与Senecavirus病毒属中的病毒成员同源性最高,由此可以确定本研究所分离到的SVV属于Senecavirus病毒属。本研究为进一步研究SVV的致病性和致病机制奠定了基础。展开更多
Silicon (Si) is regarded as a promising material for lithium-ion battery anode because of high theoretical capacity. Nevertheless, Si faces particle pulverization and rapid capacity fading due to serious volume change...Silicon (Si) is regarded as a promising material for lithium-ion battery anode because of high theoretical capacity. Nevertheless, Si faces particle pulverization and rapid capacity fading due to serious volume change during the lithiation and the delithiation process. In this work, a silicon/carbon composite constituted to Si powder and carbon nanofiber (CNF) is produced to solve the above issues as a new design structure of anode material. The Si powder was recycled from the silicon slicing waste in photovoltaic industry and the CNF was from dry rice straws. By mixing the purified Si powder with CNF, the composite was synthesized by the freeze-drying method and calcination. In the cyclic test, Si adding with 1 wt% CNF showed 3091 mAh/g capacity in the first cycle and 1079 mAh/g capacity after 100 cycles at the current density of 0.5 A/g, which were both better than pristine Si. SEM images also show the composite structure can eliminate cracks on the surface of the electrode during cycling. CNF attaching on Si particles can increase specific surface area, so binder can easily combine the active materials and the conductive materials together. This strategy enhances the structure stability and prevents the electrode from delamination.展开更多
文摘猪塞内加谷病毒(Seneca Valley virus,SVV)是一种新出现的可感染仔猪及母猪并导致仔猪死亡的病毒。2015年3月份至今年在我国、巴西及美国出现了几起塞内加谷病毒感染猪群并伴随严重的临床症状及发病死亡的疫情,造成严重的经济损失。为分离鉴定SVV,本研究将RT-PCR检测为SVV阳性的猪临床样品无菌处理后接种PK-15细胞,连续传代培养。通过细胞病变、RT-PCR扩增、电镜观察和基因序列测定对细胞培养物进行鉴定。结果表明我们成功分离到国内首株SVV,并将其命名为SVV CH-01-2015。全基因组的系统发育分析表明SVV CH-01-2015位于Senecavirus病毒属,与Senecavirus病毒属中的病毒成员同源性最高,由此可以确定本研究所分离到的SVV属于Senecavirus病毒属。本研究为进一步研究SVV的致病性和致病机制奠定了基础。
文摘Silicon (Si) is regarded as a promising material for lithium-ion battery anode because of high theoretical capacity. Nevertheless, Si faces particle pulverization and rapid capacity fading due to serious volume change during the lithiation and the delithiation process. In this work, a silicon/carbon composite constituted to Si powder and carbon nanofiber (CNF) is produced to solve the above issues as a new design structure of anode material. The Si powder was recycled from the silicon slicing waste in photovoltaic industry and the CNF was from dry rice straws. By mixing the purified Si powder with CNF, the composite was synthesized by the freeze-drying method and calcination. In the cyclic test, Si adding with 1 wt% CNF showed 3091 mAh/g capacity in the first cycle and 1079 mAh/g capacity after 100 cycles at the current density of 0.5 A/g, which were both better than pristine Si. SEM images also show the composite structure can eliminate cracks on the surface of the electrode during cycling. CNF attaching on Si particles can increase specific surface area, so binder can easily combine the active materials and the conductive materials together. This strategy enhances the structure stability and prevents the electrode from delamination.
