Non equilibrium Energy Transformation Processes 18 This series international concern in the 24th ER Conference This series international concern in fish and fisheries there is a chapter on estrogen receptor expression and regula tion in human breast cancer This thesis addresses challenging theoretical problems in this active field of current research: 1) Exact analytical solutions of work and heat distributions for isothermal non equilibrium processes in suitable models are obtained giving insight into the structure of the tail of work distributions and serving as valuable test cases for simulations of the underlying stochastic processes