Abstract: Provided are methods and compositions for negatively and positively selecting for different size nucleic acid (e.g., DNA or RNA) fragments on borosilicate glass fiber membranes, silica and metal oxide surfaces such that only those fragments falling within a desired size range are obtained.

Abstract: Provided are methods and compositions for negatively and positively selecting for different size nucleic acid (e.g., DNA or RNA) fragments on borosilicate glass fiber membranes, silica and metal oxide surfaces such that only those fragments falling within a desired size range are obtained.

Abstract: Provided are methods and compositions for negatively and positively selecting for different size nucleic acid (e.g., DNA or RNA) fragments on borosilicate glass fiber membranes, silica and metal oxide surfaces such that only those fragments falling within a desired size range are obtained.

Abstract: Provided are methods and compositions for negatively and positively selecting for different size nucleic acid (e.g., DNA or RNA) fragments on borosilicate glass fiber membranes, silica and metal oxide surfaces such that only those fragments falling within a desired size range are obtained.

Abstract: Provided is a device including a base, a pipette support, and a wall. The pipette support includes an aperture. A width of the aperture is within a range of 70 to 90 mm and a length of the aperture is within a range of 100 to 140 mm. A wall connects the base with the pipette support. The distance between the pipette support and the base is adjustable. Also provided are methods of pipetting. The methods include placing a multi-well plate below an aperture of the pipette support, inserting a multi-channel pipette comprising pipette tips into an aperture of a pipette support such that the body of the pipette rests on an edge of the aperture, and adjusting a distance between the pipette support and the base.

Abstract: The invention provides dry compositions for preparing and loading a sample on a gel for electrophoretic separation. The dry compositions preferably include a tracking dye and a sedimenting agent selected from a five-carbon polyol (e.g., ribitol, arabitol, or xylitol),iso-erythritol, maltitol, and saccharine. Methods for making and using, as well as kits comprising the disclosed compositions, are also provided.

Abstract: The invention provides dry compositions for preparing and loading a sample on a gel for electrophoretic separation. The dry compositions preferably include a tracking dye and a sedimenting agent selected from a five-carbon polyol (e.g., ribitol, arabitol, or xylitol), iso-erythritol, maltitol, and saccharine. Methods for making and using, as well as kits comprising the disclosed compositions, are also provided.