It is commonly believed that the composition of groundwater does not change naturally. So if a change is recognized through taste and/or odor, many may think that something bad has happened. Perhaps the aquifer has become contaminated, or something is wrong with the well. However, a common cause of changes in water quality is through natural variations within the aquifer. What gives groundwater...

although economic and managerial literature is replete with studies that probe about productivity but only a few studies decompose it to its components (technological changes, managerial efficiency changes and scale efficiency changes)and analysis their share in productivity changes (positively or negatively). accordingly, this article attempts to explain the issue by decompose productivity to ...

The growing demand for raw materials requires the optimization of extractive processes and innovative approaches, such as recovery quarrying processing waste. Waste from gneiss (ranging blocks up to residual sludge) used dimension stone (Beola Serizzo Piedmont, northern Italy) were characterized chemistry, mineralogy, petrography: quartz feldspars (plagioclase K-feldspar) are most abundant mine...

Trace minerals are required for essentially all biochemical processes in the body. Many of these minerals are necessary for optimal growth, physiologic function, and productivity in animals. This paper focuses on 8 trace minerals: cobalt (Co), copper (Cu), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), and zinc (Zn). These trace minerals have been chosen because nutritio...

Iron sulfide mineralization in low-temperature systems is a result of biotic and abiotic processes, though the delineation between these two modes of formation is not always straightforward. Here we review the role of microorganisms in the precipitation of extracellular iron sulfide minerals. We summarize the evidence that links sulfur-metabolizing microorganisms and sulfide minerals in nature ...

Naturally occurring arsenic in the bedrock of the Northern Appalachian Mountain belt was first recognized in the late 19th century. The knowledge of the behavior of arsenic in groundwater in this region has lagged behind nearly a century, with the popular press reporting on local studies in the early 1980s, and most peer-reviewed research articles on regional patterns conducted and written in t...

p REVIOUS work in this laboratory (Crookshank and Robbins, 1962; Robbins et al., 1965) has indicated that certain physiological relationships exist among the dietary intakes of specific minerals, the corresponding levels of these minerals in the urine and the probability of urolithiasis. The purpose of these experiments was to determine whether significant physiological relationships exist amon...

Many minerals have been proven in research studies to be essential for optimal growth, physiologic function, and productivity in ruminants. Historically, testing for these minerals has been performed on diets and/or dietary components to ensure adequate concentrations of specific minerals in the diet. However, general mineral analysis does not identify the chemical forms of the minerals, which ...

MineralsFocus Edzard Lübben " With some 17,500 software engineers worldwide, Siemens counts among the world's biggest software companies. " Editorial | MineralsFocus 4/2015 3 Products from Siemens are built to last. A prime example is the mine winder, which Siemens started supplying over 110 years ago. Or our Gearless Mill Drives – some of which have been in operation for over 40 years. Through...