A method and system for creating contact center models are described. According to the basic principles of the present invention it is proposed that the secure access modules of a purse provider support multiple user groups or environments in the system while still requiring only one system key. The solution prevents or minimizes the adverse affects caused by ischemia, hypoxia, energy and nutrient depletion, acidification, hypothermia and reperfusion injury. 1 to 5% by weight, the added amount of the amine in the paste is 0.