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.
This will result in serious injury or death. When using the jack for clamping, the maximum clamping force of the standard top clamp-clevis. is 750 lbs. (340 kg). If you exceed this limit, the standard top clamp-clevis could bend or break, resulting in serious injury or death.