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An endo-p-l,4-D-galactanase was purified 1735-fold from a commercial enzyme preparation of Aspergillus niger. The endogalactanase was homogeneous by SDS-PAGE, having an apparent molecular weight of 32,000. It specifically hydrolyzed P-l,4-D-galactan, and is shown to be capable of releasing galactosyl oligomers and galactose from the soybean pectic polysaccharides.

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Touchless user interfaces that are based on gestures typically rely on near-infrared cameras. However, such systems are often hampered by their limited field of view and high-accuracy calibration requirements. Here we report a touchless user interface that is based on a visually transparent near-infrared-sensitive organic photodetector array and can be used on top of a display. Optical transparency is achieved by using a printed copper grid as a bottom transparent conductive electrode and an array of patterned organic photodetector subpixels. Electro-optical modelling is used to optimize the design of the image sensor, leading to a photodetectivity of approximately 1012 Jones at 850 nm and a high visible-light transmittance of 70%. We show that the imager can be used as a penlight-controlled and gesture-controlled touchless user interface when combined with a commercial display.

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