Accurate trace-metal and strontium-isotope analyses of archaeological corn cobs require that metal contaminants be removed prior to chemical analysis. Archaeological cobs are often coated with construction debris, dust, or soilwhich containsmineral particles. In addition,most archaeological cobs are partially or completely burned and the burned parts incorporatemineral debris in their hardened ...

BACKGROUND Nonalcoholic fatty liver disease (NAFLD) may be an important factor leading to altered trace mineral homeostasis, thereby accelerating the progression of hepatitis C virus (HCV) infection. Our aim was to determine whether NAFLD influenced the status of certain essential trace minerals and oxidative stress in chronic HCV-infected patients. DESIGN AND METHODS Blood biochemical parame...

This paper describes a categorized thresholding strategy to automatically discover the optimal thresholds during requirements tracing process. An objective function is proposed as a critical measurement in evaluating the performance of thresholding methods. Also, this paper reports early experimental results for this strategy and illustrates its satisfying performance over training dataset.

279 14.1 Role of vitamin B12 in human metabolic processes Although the nutritional literature still uses the term vitamin B12, a more specific name for vitamin B12 is cobalamin. Vitamin B12 is the largest of the B complex vitamins, with a relative molecular mass of over 1000. It consists of a corrin ring made up of four pyrroles with cobalt at the centre of the ring (1, 2). There are several vi...

145 8.1 Nutrients with an antioxidant role The potential beneficial effects of antioxidants in protecting against disease have been used as an argument for recommending increasing intakes of several nutrients above those derived by conventional methods. If it is possible to quantify such claims, antioxidant properties should be considered in decisions concerning the daily requirements of these ...

Because of their high specific surface area, optimum rheological characteristics and/or excellent sorptive capacity, certain clay minerals such as kaolinite, talc, montmorillonite, saponite, hectorite, palygorskite and sepiolite are extensively used in the formulation of various pharmaceutical and cosmetic products. Whether as active ingredients or as ideal excipients, these minerals must compl...

An element is considered as dietary essential when its absence or insufficiency in diet causes deficiency syndrome and supplementation in normal level brings back normal health. An organism can neither grow nor remain healthy without the element in question. The element should have a direct influence on the organism and involved in the metabolism. Effects of the essential elements cannot be who...

Introduction Mineral dust aerosol plays a critical role in atmospheric chemistry by providing reactive surfaces for trace atmospheric gases. 1-3 Mineral dust particles undergo heterogeneous reactions with nitrogen oxides in the atmosphere to yield adsorbed nitrate, nitrate coatings or deliquesced nitrate layers. 1,4,5 Reactions that can alter NOx (NOx = NO + NO2) concentrations are of great imp...

Disposable nappies (diapers) have been satisfactorily demineralized and used for the collection of excreta from infants and young children during mineral and trace metal balances. It was possible to investigate children of both sexes without immobilization.