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.
BANDIT CROSS PEEL TESTER-. Most cross peel testers incorporate thumb screws to secure the test strips. We have updated this by adding air clamps to secure the test strips. A top loading design allows for faster, easier loading, adjusting and observing the peel rates. An auto cycle switch was added allowing a hands free operation while peeling.