Abstract: A filtration apparatus and method is disclosed, the apparatus including a container tube for holding a sample to be filtered and a filtering vessel inserted therein. The filtering vessel carries a filter over its lower end and includes a chamber portion for receiving the filtrate. The method includes forcibly immersing the filtration vessel into the container tube, limiting the relative axial position therebetween, and subjecting the apparatus to centrifugation. The apparatus and method is useful for filtering dilute, concentrated and particle-laden samples.

Abstract: A method and apparatus for supplying a preset amount of sample solution to a liquid chromatographic column wherein (1) a first piston, which moves along the axis of a piston container sealingly contacting the side walls of said piston container, is moved a preset distance so as to draw a fixed amount of driving solution from the driving solution chamber of a piston cylinder into the piston container, thus displacing a second piston which moves along the axis of said piston cylinder sealingly contacting the side walls of said piston cylinder and dividing said piston cylinder into a sample solution chamber and a driving solution chamber, said displacement of said second piston serving to cause sample solution to be drawn from a sample solution reservoir into the sample solution chamber of the piston cylinder in a fixed amount equal to the fixed amount of driving solution drawn into the piston container; and (2) driving solution is pumped into said driving solution chamber in order to displace said second piston

Abstract: A method and apparatus for supplying a preset amount of sample solution to a liquid chromatographic column wherein (1) a first piston, which moves along the axis of a piston container sealingly contacting the side walls of said piston container, is moved a preset distance so as to draw a fixed amount of driving solution from the driving solution chamber of a piston cylinder into the piston container, thus displacing a second piston which moves along the axis of said piston cylinder sealingly contacting the side walls of said piston cylinder and dividing said piston cylinder into a sample solution chamber and a driving solution chamber, said displacement of said second piston serving to cause sample solution to be drawn from a sample solution reservoir into the sample solution chamber of the piston cylinder in a fixed amount equal to the fixed amount of driving solution drawn into the piston container; and (2) driving solution is pumped into said driving solution chamber in order to displace said second piston