| 1 | Model Selection in Spatial Autoregressive Models with Varying Coefficients显示文摘Spatial autoregressive (SAR)models with varying coefficients are useful for capturing heterogeneous effects of the impacts of covariates as well as spatial interaction in empirical studies,and a wide range of popular models can be seen as its special cases,such as linear SAR models.In this study,we will propose a unified model selection method for the SAR model with varying coefficients to achieve two targets simultaneously:(1)variable selection (eliminate irrelevant covariates),and (2) identification of the covariates with constant effect among the relevant covariates.To do so,we follow the idea of group LASSO to incorporate two penalty functions to simultaneously do model selection and estimation.Monte Carlo experiments show that the proposed method performs well in finite samples.Finally,we illustrate the method with an application to the housing data of Chinese cities. | Hongjie Wei Yan Sun Meidi Hu | 2018 | Frontiers of Economics in China-Selected Publications from Chinese Universities2018，13，4： | 1 |
| 2 | Oral PLGA-based DNA vaccines using interferons as adjuvants remarkably promote the immune protection of grass carp(Ctenopharyngodon idella)against GCRV infection显示文摘Grass carp hemorrhagic disease caused by grass carp reovirus(GCRV)results in significant economic losses to the global grass carp aquaculture industry.Oral vaccination is an ideal choice for disease precaution in aquaculture.However,oral vaccine can be degraded in the gut.Therefore,the selection of loading materials is essential.In this study,the S6 and S7 fragments(encoding the outer capsid protein VP4 and fibronectin VP56 of GCRV)and grass carp interferons(IFNs),including IFN1,IFN3,and IFNγ2 were used to create DNA vaccines and adjuvants based on pcDNA3.1,respectively.The oral DNA vaccine was encapsulated in poly(lactic-co-glycolic acid)(PLGA)and polyvinyl alcohol(PVA)with IFNs.The PLGA-PVA(PP)nano-microspheres were prepared by double emulsionsolvent evaporation technique.Using transmission electron microscopy and dynamic light scattering assays,it was determined the vaccines had a spherical structure with uniform particle size(643.5±35.3 nm).The nanomicrospheres possessed excellent encapsulation efficiency(81.6±2.6%)and loading rate(0.54±0.02%),and simultaneously exhibited negligible hemolytic activity and cell toxicity.The protection rate and tissue viral loads post-GCRV challenge in grass carp were assessed.The oral PP nano-microsphere with pVP4 t pIFN1(PP41)vaccine increased protection rate by 44%compared with the control group and was correlated with relatively low viral loads in the spleen,head kidney,and hindgut.Further,three crucial serum biochemical indexes,total superoxide dismutase(TSOD),complement C3(C3),and lysozyme(LZM),were also dramatically increased.Furthermore,mRNA expressions of representative immune-related genes(IgM,IFN1,IFNγ2,MHC-I,and CD8α)in the head kidney and spleen were significantly enhanced.In addition,mRNA expression of IgT was significantly boosted in the hindgut.The results indicate that DNA vaccine capsulated with PP is effective against GCRV infection.The present study provides insights into a prospective strategy for oral vaccine development in aquaculture. | Chaolin Jiang Xingchen Huo Lingjie Tang Meidi Hu Chunrong Yang Daji Luo Jianguo Su | 2023 | Water Biology and Security2023，2，2： | 0 |
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