The horizontally opposed center fired engine improves on the traditional design of the horizontally opposed engines and center fired engines with a better engine geometry. The bioremediating geocomposite mat includes a woven or non-woven geotexile, having a thickness of about 6 mm to about 200 mm. The scribe line area is configured to separate the plurality of chip areas from each other. Designed to match typically observed human blood glucose rates of change due to food digestion and insulin injection, these filters are two and three term exponential functions respectively. Novel microchannel structures are also described.