The low frequency filter for biomedical applications scales down the pole frequency while accomplishing a 5-bit reduction in the cut off frequency. The node also determines if an input feeding the output has less traffic marked than is to be marked at the output, and marks unmarked traffic of that particular input corresponding to a ratio substantially equal to the difference between what is needed at the output and what is marked at the input. The method also comprises estimating a motion of blocks of the image, wherein the motion of a given block of a given image represents how the scene content of the given block has moved during a time interval before taking the given image. The injection system can also be comprised of electrical wiring and a mixture delivery system having a pressure source. A reinforcing rib reacts any forces the tongue member may experience as it digs into the soil beneath the water into the central portion of the body of the weight to resist possible bending or breakage of the tongue. The solid state light emitting component may include a blue shifted yellow component with a higher color temperature, but in combination with the other elements the aggregated emissions from the lighting device have a lower color temperature.