A packer assembly with an enhanced sealing layer is provided. At each of a number of locations along the airfoil a number of frequencies of alternating current are passed through the airfoil. Connector struts may comprise first connector struts and second connector struts, wherein the first connector struts are nonparallel to the second connector struts. , speech and audio, are synthesized from multiple sine waves. The methods include providing the lactic acid bacteria a suitable medium for the production of lactic acid, which is directed to the culture of sulfate-reducing bacteria for use as a substrateelectron donor for the reduction of sulfates present in the environmental effluent. Once molded, the sides of the pick-up bed are folded into shape along hinge edges and connected to stay in place.