Methods for in-vitro analysis of biological cells andor microorganisms to determine characteristics such as: degree of differentiation, cell type, donor individuals, culture conditions, purity, lack of natural characteristic, or additional characteristics in comparison to natural characteristics. The nonvolatile semiconductor memory device has a voltage determining part for determining a voltage level of a predetermined node in the semiconductor memory device in rewriting of the storage region, and a rewrite unit determining part for determining the number of bits of input data to be rewritten at once on the basis of a result of determination of the voltage determining part. For this purpose, the electric motor can be coupled to the free edges of the window shade strips or directly coupled to the winding shafts. The ceramic heating element is positioned within the interior chamber while the upper portion of the interior chamber is temporarily sealed by the mouth piece. The creation of process documentation for new products is facilitated based on a concept of contentdocument inheritance.