Benzene was mineralized to CO2 by aquifer-derived microorganisms under strictly anaerobic conditions. The degradation occurred in microcosms containing gasoline-contaminated subsurface sediment from Seal Beach, California, and anaerobic, sulfide-reduced defined mineral medium supplemented with 20 mM sulfate. Benzene, at initial concentrations ranging from 40 to 200 microM, was depleted in all m...

Demineralized sections of fluorinated bones and teeth have been studied by autoradiography following in vitro uptake of Ca(45) or S(35)O(4). The portions of tissue which do not become mineralized (cartilage, prebone, predentine, and precementum) show an increased Ca(45) uptake apparently related to an increase in chondroitin sulfate content in fluorosis. The tissues from the fluoride-fed animal...

Cementoblastoma is a benign lesion of the odontogenic ectomesenchymal origin. It rarely occurs in primary dentition. This report describes a case of a cementoblastoma relating to the right mandibular second primary molar in a 7-year-old girl. Her panoramic radiograph revealed a well-defined radiopaque lesion with a radiolucent border extending from the distal surface of the mandibular right fir...

The pattern of mineralization was studied in the mandibular condyle of the young adult rat. Specimens were rendered anorganic in NaOC1 and examined in a scanning electron microscope. A mineralized cartilage front was found to persist on the articular aspect of the condyle. The surface is characterized by closely approximating chondrocyte lacunae enclosed to different degrees within the minerali...

introduction iron-apatite ore deposits well known as kiruna iron type formed in association with calc-alkaline volcanism from proterozoic to tertiary (hitzman et al., 1992). liquid immiscibility in an igneous system was proposed to explain the formation of the iron oxides accompanying apatite in mineralized zones (förster and jafarzadeh, 1994; daliran, 1999). the mode of ore formation however, ...

The transition element molybdenum (Mo) possesses diverse valances (+II to +VI), and is involved in forming cofactors in more than 60 enzymes in biology. Redox switching of the element in these enzymes catalyzes a series of metabolic reactions in both prokaryotes and eukaryotes, and the element therefore plays a fundamental role in the global carbon, nitrogen, and sulfur cycling. In the present ...

Younger granite bodies form two arches, the western and eastern (WA, EA), which extend from south northwards Meatique, ophiolitic group-island arc rocks, to large older outcrop north. This paper concerns feasibility of exploration in El-Erediya-Ria El-Garah-El-Gidami-El-Missikat Y Gr regions. Fieldwork remote sensing, together with geochemical, petrochemical, mineralogical studies, are used sho...