sar-kuh porphyry copper deposit is located 6 km southwest of the sar-cheshmeh copper mine, kerman province, iran. based on field geology, petrography and fluid inclusions studies, four alteration types have been identified in the sar-kuh area. early hydrothermal alteration formed a potassic zone in the central parts of mamzar granite/grano-diorite stock and propylitic alteration in its peripher...

Introduction: Dating of early solar system processes such as differentiation and core formation of planetesimals and planets frequently relies on shortlived decay systems such as Hf-W [e.g. 1] or Pd-Ag [e.g. 2,3]. However, these systems are susceptible to the effects of galactic cosmic rays (GCR) and hence, acquiring correct ages requires knowledge of the exposure history of the meteorite. Expo...

Tracer techniques have become an established part of metabolic research and indeed are a fundamental part of our understanding of carbohydrate metabolism in humans. This review is meant to provide a basic overview of the problems and potential pitfalls associated with these techniques in the hope that they are reliably applied to newer areas of research. A quantitative measurement of the substr...

Introduction Direct measurement of de novo lipogenesis has not previously been possible in humans. We measured de novo hepatic lipogenesis in normal men by means of stable isotopes and by combining the acetylated-xenobiotic probe technique with mass isotopomer analysis of secreted very low density lipoproteinfatty acids (VLDL-FA). Sulfamethoxazole (SMX) was administered with ['3Clacetate during...

Correlations beyond the mean field in Magnesium isotopes: Angular momentum projection and configuration mixing. Abstract The quadrupole deformation properties of the ground and low-lying excited states of the even-even Magnesium isotopes with N ranging from 8 to 28 have been studied in the framework of the angular momentum projected generator coordinate method with the Gogny force. It is shown ...

Oxygen isotope abundance variations in meteorites are very useful in elucidating chemical and physical processes that occurred during the formation of the solar system (Clayton, 1993). On Earth, the mean abundances of the three stable isotopes are O: 99.76%, O: 0.039%, and O: 0.202%. It is conventional to express variations in abundances of the isotopes in terms of isotopic ratios, relative to ...

Plant metabolic activity in arid and semi-arid environments is largely tied to episodic precipitation events or ‘‘pulses’’. The ability of plants to take up and utilize rain pulses during the growing season in these water-limited ecosystems is determined in part by pulse timing, intensity and amount, and by hydrological properties of the soil that translate precipitation into plant-available so...