METHODS Population studied The “normal” population consisted of 75 asymptomatic healthy
volunteers who did not have a history of foregut symptoms, upper gastrointestinal disease, …

Samples of graphite have been recovered after exposure to explosive shocks of 300,000-atm
estimated intensity. X-ray and electron-diffraction examinations prove the existence of …

Silicon and Germanium crystal structure changes at high pressures from the
semiconducting diamond-type Page 1 in a state veryclose to the native one. Blood samples …

At high pressures, as determined by x-ray analysis, titanium and zirconium metal have a
distorted, body-centered-cubic structure. This phase persists on pressure release. The normal …

Black phosphorus undergoes two reversible structural transitions at high pressures. The first
is to a structure of the type arsenic A7. This structure is transformed to a simple cubic …

The possibility of mining seafloor massive sulfide deposits has stirred debate about the
sustainable use of this new resource and whether commercial development is worth the risk. …

Marine minerals such as manganese nodules, Co-rich ferromanganese crusts, and seafloor
massive sulfides are commonly seen as possible future resources that could potentially add …

A new technique using ``amorphous'' boron as a pressure vessel yields satisfactory Debye—Scherrer
patterns for substances subjected to quasi‐hydrostatic pressures ranging up to at …

4. RESULTS The procedure as described in Sec. 3 has been carried out using a beam of 1.5-Mev
electrons at an average beam current incident on the phantom surface of 3 X 10-4 jla …

The equilibrium curve for two of the phases of CaCO 3 , calcite‐aragonite, has been determined
as a function of temperature and pressure over the range 25–80C and several thousand …