Abstract: A hydrocarbon production system comprises a topside installation connected to a underwater distribution unit 4 by an umbilical 3. The unit 4 is connected to Christmas Trees 8, 9 and 10 by respective ones of jumper interconnects 11, 12 and 13. Each Christmas Tree may comprise one or more of an electrical actuator 14, flow rate control choke 16, pressure and/or temperature transducers 18, down hole measurement transducers 18a and/or a down hole safety valve 21. Electrical power is transmitted to the unit 4 by a high voltage transmission cable forming part of the umbilical 3. A transformer forming part of the unit 4 steps down the voltage transmitted over the umbilical 3 to a level suitable for use by the electrical devices 14, 16 and 21. Power and control of the devices 14, 16, 18, 18a, 21 is effected by an underwater controller 5, 6, 7 associated with its respective Christmas Tree 8, 9, 10.

Abstract: An enzyme complex having collenagenolytic activity, comprising a mixture of collegenolytic proteases from crabs is disclosed. The proteases of the complex have the ability to cleave bovine lens capsule collagen type IV, have molecular weights from about 23,000 to 36,000 daltons, and possess a collagenolytic activity of more than about 3.300 Mandl units/mg at a pH of 7.5. The complex is isolated in aqueous solutions without the use of organic solvents from the hepatopancreas of crabs. The crabs from which the complex can be isolated are of the paralithodes and chinocetes species of crabs.