A tunnel oven using air impingement as the heat transfer mechanism is constructed for significant reduction of energy consumption and minimal labor required for cleaning. At least a part of the steam holes is consecutively arranged in a line and, further, at least a part of the depressions is arranged in multiple lines along the steam holes consecutively arranged in the line. The proteins and genes are useful for activating disease resistance, enhancing plant cell transformation efficiency, engineering herbicide resistance, genetically targeting cell ablations, and other methods involving the regulation of cell death in plants. In one aspect, changing the positional relationship, by moving the device nearer to a boring tool which supports the receiver, causes an increase in accuracy of depth determination. The device has an inlet for fluid, a discharge outlet for tissue and fluid, and a further outlet that discharges most of the fluid.