Ergonimic hand tools according to the present disclosure provides variations in finger relief to accommodate variations in human physiology and an aligning finger handle that aligns the users fingers into a minimum stress position relative to each other and to the thumb. This invention also relates to crystals of the polypeptide fragments which are suitable for structure determination of said polypeptide fragments using X-ray crystallography and computational methods using the structural coordinates of said polypeptide to screen for and design compounds that modulate, preferably inhibit the endonucleolytically active site within the polypeptide fragment. Preferably, the carrier member may include recesses at opposite ends for receiving and supporting reflectors thereon to prevent vibration while allowing interchangeability for different vehicle types. Each printhead assembly also includes a printhead module configured to eject ink onto the print media. An optional hybrid plugsluice method of biomass feeding using the devices permits biomass loading at sluice pressures intermediate between atmospheric and reactor pressure, thereby reducing \u201cpump cycle\u201d time and increasing biomass throughput capacity. The thermoacoustic driven compressor generates scalable compressed air from a given heat source.