In Chihuahua, an important source of environmental radioactivity is found in the Sierra Peña Blanca, center state. The site comprises about 70% uranium reserves Mexico. Blanca was explored and partially exploited '80s. Due to closure operations, extracted unprocessed ore (hundreds tons) confined rocky stacks, exposed weathering. Subject leaching, this transported from mountains Laguna del Cuerv...

The pH-dependent hydrogen isotope exchange reaction between gaseous isotopes and medium isotopes and hydrogenation of the carbonyl compounds have been investigated with water-soluble bis(mu-thiolate)(mu-hydride)NiRu complexes, Ni(II)(mu-SR)(2)(mu-H)Ru(II) {(mu-SR)(2) = N,N'-dimethyl-N,N'-bis(2-mercaptoethyl)-1,3-propanediamine}, as functional models for [NiFe]hydrogenases. In acidic media (at p...

We studied firstly the ground state properties of C-isotopes using a deformed Hartree-Fock (HF)+ BCS model with Skyrme interactions. Shallow deformation minima are found in several neutron−rich C-isotopes. It is shown also that the deformation minima appear in both the oblate and the prolate sides in 17C and 19C having almost the same binding energies. Secondly, we carried out shell model calcu...

Chemical, biological, and physical processes lead to distinctive "isotopic signatures" in biological materials that allow tracing of the origins of organic substances. Isotopic variation has been extensively used by plant physiological ecologists and by paleontologists, and recently ecologists have adopted the use of stable isotopes to measure ecosystem patterns and processes. To date, animal p...

Pine-oak ecosystems are globally distributed even though differences in anatomy and leaf habit between many co-occurring oaks and pines suggest different strategies for resource use, efficiency and stomatal behavior. The New Jersey Pinelands contain sandy soils with low water- and nutrient-holding capacity providing an opportunity to examine trade-offs in resource uptake and efficiency. Therefo...

The study was carried out in the territory of Polesie State Radioecological Reserve. For long-term environmental effects Chernobyl accident Belarus, Reserve established 1988. It is located Belarus sector exclusion zone. objective to estimate content plutonium isotopes samples inside and outside area. Determination by alpha spectrometry. method includes complete decomposition samples, radiochemi...