Carbocations are species bearing a formal + charge on carbon. The have sp2 hybridization and trigonal planar geometry, with an empty p orbital on carbon, perpendicular to the plane containing the substituents (see diagrams shown to the right).
Aortic cross-clamp. An aortic cross-clamp is a surgical instrument used in cardiac surgery to clamp the aorta and separate the systemic circulation from the outflow of the heart. An aortic cross-clamping procedure serves, for example, in the repairing of coarctation of the aorta.
The 1 in. x 1-1/4 in. Beam Clamp is made of malleable iron construction. The product is manufactured from hot rolled carbon steel with a zinc finish. The clamp is intended for use hanging threaded rod and fits flanges up to 15/16 in. thick. Use for hanging threaded rod