Abstract: A method for testing the repeatability of test runs of a rheologic instrument. Such instrument will, typically, include a power shaft and a test chamber. The disclosed method constitutes the step of using a torque transducer to reiteratively compare the reactive torques imparted to a power shaft through the use of sequences of rheologic references.

Abstract: Disclosed is an end clamp for use with a gel slab plate assembly, such assembly including a pair of flat, rectilinear plates separated at their longitudinal end surfaces by a resilient spacer. The end clamp includes an elongate wedge element having a longitudinal dimension substantially equal to the longitudinal dimension of said pair of flat plates. The wedge, in transverse cross-section, substantially defines a scalene triangle having a major base, a minor base and a hypotenuse. Said major base is adapted for flush press-fit contact with a flat end of said pair of rectilinear plates. Further provided is a substantially U-shaped clamp housing proportioned to longitudinally surround, on three sides, one longitudinal edge of the pair of plates. The clamp housing is provided, upon its plate-edge surrounding surface, with an inclined plane proportioned to mate with the hypotenuse of the wedge element.

Abstract: The disclosure relates to a method for substantially eliminating electrophoretic rate differentials between simultaneously disposed side-by-side lanes of test samples.

Abstract: Disclosed herein is a gel slab electrophoresis device having novel temperature and heat control capability. The electrophoresis device includes a sample unit having a pair of transversely-spaced first and second plates containing a gel cast, these plates having open top and bottom slots spaced therebetween. An integral part of the apparatus is a heat sink which is in thermal communication with the sample unit, the heat sink constituting a pneumatic circuit for both heat distribution and removal to and from the gel cast. There is also provided upper and lower solution chambers, both filled with conductive solutions, and both in fluid communication with the respective top and bottom portions of the gel. The apparatus also includes an arrangement for applying an electrical potential between the upper and lower solution chambers and, thereby, across the entire vertical length of the gel. Additionally provided is a refrigeration sub-system, the output of which is heat exchanged into the pneumatic circuit.