Abstract: A system includes a syringe barrel, a syringe plunger, and an annular collar. The syringe barrel has a longitudinal axis aligned axially between a discharge end and a cylinder end. The syringe plunger has a cap disposed on a first end, a piston disposed on a second end and configured for disposition in a bore of the barrel, and has a body disposed between the first end and the second end. The body has an external thread on a first surface and the body has a visible calibration indication aligned axially. The annular collar has at least one interrupted internal thread segment on an interior surface. The collar has elasticity such that in a first state, the internal thread is configured to engage the external thread and in a second state, in which a compressive force is exerted on opposing sides of the collar, the internal thread is disengaged from the external thread.

Abstract: An electrically conductive diamond electrode and process for preparation thereof is described. The electrode comprises diamond particles coated with electrically conductive doped diamond preferably by chemical vapor deposition which are held together with a binder. The electrodes are useful for oxidation reduction in gas, such as hydrogen generation by electrolysis.

Abstract: An electrically conductive diamond electrode and process for preparation thereof is described. The electrode comprises diamond particles coated with electrically conductive doped diamond preferably by chemical vapor deposition which are held together with a binder. The electrodes are useful for oxidation reduction in gas, such as hydrogen generation by electrolysis.