The present invention provides improved reactive cement compositions for sealing hydrocarbon containing subterranean zones and methods of using the cement compositions. Furthermore, the invention relates to compounds for preventing andor treating any type of pain, inflammatory disorders, immunological diseases, proliferative diseases, infectious diseases, cardiovascular diseases and neurodegenerative diseases. In the bidirectional moving micro-robot system, the length of the connection member exposed between the first and second bodies is extended or contracted. The side walls include a number of half-spherical embosses stamped therefrom to abut against the front metal shell for EMI protection. Minor portion may be completely surrounded in an aperture in major portion or may have apertures to which air is fed via ducting.