Reaction at CATHODE: 1  H+H+ and Cu2+Cu2+ ions are attracted to the cathode. 2  Cu2+Cu2+ ions are preferentially discharged as Cu2+Cu2+ is lower in the electrochemical series than H+H+. 3  Each Cu2+Cu2+ ion gains two electrons from the cathode to form one copper atom.
One of the most well known spine cranks is the boston crab, which is usually depicted in pro-wrestling context. Similarly to neck cranks, spine cranks are illegal techniques in most combat sports, excluding some submission wrestling and mixed martial arts competitions, where they are used as submission holds.
Shell rot appears as black or dark green patches that have eaten away parts of a hermit crab's exoskeleton. It most often occurs on the legs, but may also affect claws and the body. It is unknown whether shell rot can affect humans, but it may spread between hermit crabs. There has not been a lot research conducted on shell rot, but it may affect other crustaceans such as lobsters. Hermit crabs can free themselves from shell rot by moulting.