  The ability of single grain boundaries in YBa2Cu3Ox bicrystalline rings to
carry electrical current is found to be significantly enhanced under
hydrostatic pressure. Nearly hydrostatic pressures are applied to the alkali
metals Li, Na, and K. in a search for superconductivity. Whereas Li becomes
superconducting above 20 GPa at temperatures as high as 15 K, no
superconductivity was observed above 4 K in Na to 65 GPa nor in K above 4 K to
43.5 GPa or above 1.5 K to 35 GPa.
