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J N Beck

Publications and source records attributed to J N Beck.

11 recordsLinked to original sources
PubMed1995

Evaluation of soil radioactivities using pedologically based sampling techniques.

A new type of soil sampling protocol is suggested which has applicability to surveys of environmental radioactivity. Often there is a higher concentration of radionuclides in the lower B horizon than in the upper A horizon of well-drained, well-developed soils. It is recommended that soils be sampled pedologically, i.e., by soil horizon, rather than incrementally in depth. An example is given from a site in northern Louisiana where surface and/or the classical 15 cm ("six-inch") deep sampling could lead to erroneous conclusions regarding anthropogenic contamination.

Soil Pollutants, Radioactive↗
PubMed1989

Variations of heavy metals and arsenic in fish and other organisms from the Calcasieu River and Lake, Louisiana.

The edible parts of several species of fish and other marine organisms inhabiting the Calcasieu River/Lake, Louisiana were analyzed for Cd, Cr, Cu, Pb, Hg, Ag, Zn and As. Concentrations of all metals measured in both intra and interspecies showed no significant variation with sample location. Differences in elemental concentrations were related to organism mobility and not to site-specific variations in metal loadings. Different species of finfish contained only trace amounts of Cd (0.02-0.08), Ag (less than 0.01-0.3), Pb (less than 0.2-0.5), and As (less than 0.1-0.3) mg kg(-1). Concentrations of Cu and Cr were highly variable, in contrast to Zn, which was present in relatively constant amounts across all species (28 +/- mg kg(-1). Sessile organisms such as oysters had the highest concentrations of heavy metals, including Cd. Periphyton and zooplankton were the only groups that showed differences in metal concentrations with sampling location.

Animals↗
PubMedDate not supplied

[Left caudal vena cava: report of a case].

The infrarenal part of the vena cava inferior running at the left side of the abdominal aorta has been observed in a 70 years old caucasian man without any other anomaly in the position of the abdominal viscera. This atypical vascular pattern was associated with the persistence of a rudimentary right inferior vena cava corresponding to the right supracardinal vein. The embryonic origin of this anatomical variation and its clinical importance are discussed.

Aged↗