Hydrogen isotope biogeochemistry reactors in 1988, but nuclear weapons testing in the 1950s added large spikes of radioactive elements to the atmosphere, especially radiocarbon and tritium. This complicated measurements for geologists using radiometric dating of carbon. However, some oceanographers benefited from the tritium increase, utilizing the signal in the water to trace physical mixing of water masses. In biogeochemistry, scientists focused primarily on the stable isotope of deuterium as a tracer for environmental processes, especially the water cycle. The American geochemist Harmon Craig, once a graduate student of Urey's, discovered the relationship between rainwater's hydrogen and oxygen isotope ratios. The linear correlation between
Isotope 244 expected release date in the fourth quarter of 2012. Isotope 244 Isotope 244 is a video game developer, based in the USA. It was founded by James Bryant in 1999. Isotope 244 is best known for developing retro remakes and real-time strategy genres for both desktop and mobile devices. Isotope 244 was also a leading developer of 3D screensavers in the early 2000s. The company received several mentions for its retrogaming and real-time strategy games, above all on portable platforms. IP Atomic Cannon Pocket was a notable turn-based strategy game available on the Pocket PC. It was the top selling