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The cycles of the key nutrient elements nitrogen (N) and phosphorus (P) have been massively altered by anthropogenic activities… Expand SUMMARY The phosphoenolpyruvate(PEP):carbohydrate phosphotransferase system (PTS) is found only in bacteria, where it catalyzes… Expand We present the concept of circuit nanoelements in the optical domain using plasmonic and nonplasmonic nanoparticles. Three basic… Expand This review focuses on key aspects of the thermal decomposition of multinary or mixed hydride materials, with a particular… Expand All life is organized as cells. Physical compartmentation from the environment and self-organization of self-contained redox… Expand D ifferent areas in biology are often criticized for being either too myopic and not asking questions about how their results fit… Expand Resumen en: We present a chemical evolution model for the Galaxy which assumes that the evolution of the halo and thick disk is… Expand Now acknowledged as a classic in the philosophy of science, A Realist Theory of Science is one of the very few books which has… Expand 1. Discussion Alkalinity of a water is its acid-neutralizing capacity. It is the sum of all the titratable bases. The measured… Expand Abstract The rare earth pattern in sedimentary rocks is nearly constant and is considered to represent the relative abundances of… Expand