The present invention provides methods, as well as compositions related thereto, for the efficient transduction of cells using viral vectors. The systems and methods are practiced in varying combinations by differing embodiments, with many of the embodiments’ husbandry containers, for example, being well suited for both alterable suspension on a repositionable member as well as stable placement as tableware. This creates a spatial and time gap between the trailing edges of a set of sod strips on the third conveyor and the leading edges of the next set of sod strips behind them on the second conveyor. The driving tooth is disposed on the shaft. The part is moved to reduce the relative velocity between that part and the substrate so that the speed at which the substrate may be moved relative to the projection system may be increased.