The synergistic activity of SpltNPV or SeNPV chitinase expressed in Escherichia coli with the baculovirus in infecting host insects Expression of Fructose Valine Oxidase in Sf9 Cells Research Progress of Proteins Associated with Per os Infectivity of the Occlusion-derived Virus Advances in Research of Insect Cell Engineering The Structural and Phylogenetic Analysis of Late Expression Factor 8