Abstract: A gel extraction device (10) comprises a hollow cutting member (12) having cutting edge (14) at one end and a squeeze bulb (16) at the other end. In a further embodiment, the air passage between the cutting edge and the bulb has a constriction zone (20) to prevent any extracted gel from being drawn too deeply into the extractor, in another embodiment, a blow-hole in the hollow cutting member or in the squeeze bulb provides for the passage of air displaced by gel through the extractor. The blow-hole may be covered to secure the gel in the receptacle for transfer from the matrix to a sample container.

Abstract: A gel extraction device (10) comprises a hollow cutting member (12) having cutting edge (14) at one end and a squeeze bulb (16) at the other end. In a further embodiment, the air passage between the cutting edge and the bulb has a constriction zone (20) to prevent any extracted gel from being drawn too deeply into the extractor, in another embodiment, a blow-hole in the hollow cutting member or in the squeeze bulb provides for the passage of air displaced by gel through the extractor. The blow-hole may be covered to secure the gel in the receptacle for transfer from the matrix to a sample container.

Abstract: A gel extraction device comprising a hollow cutting member and a plunger ejector member. The hollow cutting member has a proximal tubular body terminating at one end in a circular rim having oppositely disposed spring engaging structures and a distal sloped transition portion ending in a rectangular receptacle and a tapered end portion with a sharp perimeter cutting edge. The plunger ejector member has a proximal cap atop and connected to a split stem portion having outer legs with shoulder stop extensions; an inner ribbon spring leg having a distal end inserted into a spring engaging structure in the assembled device; and a solid rectangular distal portion. In a second embodiment the split end portion is replaced by a stem having a plurality of lateral protrusions and a coiled spring is placed within the hollow cutting member tubular body. A third embodiment is a hybrid of the first two embodiments.

Abstract: A device for teaching reading and passage of time which comprises a clock face composed of not less than three planes having two separate numerical scales circumferentially and concentrically disposed therein; the outer minute scale on the highest plane represented by 60 sector shapes, each sharing a common border line set at increments of 6 degrees beginning at zero degrees at the top center of the circular scale; each minute sector shape containing a plurality of minute numerals centrally spaced within each minute sector shape and directly in line with each border line interval; the inner hour scale on the next lower plane represented by 12 sector shapes each sharing a common border line set at increments of 30 degrees beginning at zero degrees at the top center of the circular scale; each hour sector containing numerals 1 to 12 centrally spaced within each hour sector and directly in line with each border line interval; each minute and hour sector shape graphically skewed; and respective hour and minute ha