When a memory device receives two or more pluralities of bits from a host to store in a nonvolatile memory, the device first stores the bits in a volatile memory. The venting chamber is itself located in a central fuel tank located in the wing centre-box and is thus located inwardly of at least two of the fuel tanks. A soak process may be performed on the substrate surface before deposition of the metal nitride barrier layer andor metal barrier layer. The present invention further contemplates methods of use of such adjuvant compositions, particularly in eliciting an immune response, in particular a mucosal immune response to an antigenic compound.