A material feed hose has a multilayered hose with an inflow end, an intermediate length, and an outflow end. The above-mentioned dustpan is with a liftable cover. Transactions of lower priority are temporarily discontinued in favor of higher priority transactions when network capacity reaches a predetermined level. These expression vectors may be utilized to produce the BRS virus protein or peptide in quantity; the resulting substantially pure viral peptide or protein may be incorporated into subunit vaccine formulations or may be used to generate monoclonal or polyclonal antibodies which may be utilized in diagnosis of BRS virus infection or passive immunization.