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Articles 1 - 7 of 7
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Lead Exposure From Aluminum Cookware In Cameroon, Jeffrey D. Weidenhamer, Peter A. Lobunski, Gilbert Kuepouo, Rebecca W. Corbin, Perry Gottesfeld
Lead Exposure From Aluminum Cookware In Cameroon, Jeffrey D. Weidenhamer, Peter A. Lobunski, Gilbert Kuepouo, Rebecca W. Corbin, Perry Gottesfeld
Jeffrey D. Weidenhamer
Blood lead levels have decreased following the removal of lead from gasoline in most of the world. However, numerous recent studies provide evidence that elevated blood lead levels persist in many low and middle-income countries around the world at much higher prevalence than in the more developed countries. One potential source of lead exposure that has not been widely investigated is the leaching of lead from artisanal aluminum cookware, which is commonly used in the developing world. Twenty-nine samples of aluminum cookware and utensils manufactured by local artisans in Cameroon were collected and analyzed for their potential to release lead …
Spatial And Temporal Dynamics Of Root Exudation: How Important Is Heterogeneity In Allelopathic Interactions?, Jeffrey D. Weidenhamer, Brian K. Mohney, Nader Shihada, Maduka Rupasinghe
Spatial And Temporal Dynamics Of Root Exudation: How Important Is Heterogeneity In Allelopathic Interactions?, Jeffrey D. Weidenhamer, Brian K. Mohney, Nader Shihada, Maduka Rupasinghe
Jeffrey D. Weidenhamer
Understanding allelopathy has been hindered by the lack of methods available to monitor the dynamics of allelochemicals in the soil. Previous work has demonstrated the feasibility of using polydimethylsiloxane (PDMS) microtubing (silicone tubing microextraction, or STME) to construct sampling devices to monitor the release of lipophilic allelochemicals from plant roots. The objective of this study was to use such sampling devices to intensively monitor thiophene fluxes beneath marigolds over several weeks to gain insight into the magnitude of temporal and spatial heterogeneity in these fluxes. Marigolds were grown in rhizoboxes (20.5 x 20.5 x 3.0 cm) with 16 individual STME …
Evidence Does Not Support A Role For Gallic Acid In Phragmites Australis Invasion Success, Jeffrey D. Weidenhamer, Mei Li, Joshua Allman, Robert G. Bergosh, Mason Posner
Evidence Does Not Support A Role For Gallic Acid In Phragmites Australis Invasion Success, Jeffrey D. Weidenhamer, Mei Li, Joshua Allman, Robert G. Bergosh, Mason Posner
Jeffrey D. Weidenhamer
Gallic acid has been reported to be responsible for the invasive success of nonnative genotypes of Phragmites australis in North America. We have been unable to confirm previous reports of persistent high concentrations of gallic acid in the rhizosphere of invasive P. australis, and of high concentrations of gallic acid and gallotannins in P. australis rhizomes. The half-life of gallic acid in nonsterile P. australis soil was measured by aqueous extraction of soils and found to be less than 1 day at added concentrations up to 10,000 mu g g(-1). Furthermore, extraction of P. australis soil collected in North Carolina …
Fungal Superhighways: Do Common Mycorrhizal Networks Enhance Belowground Communication?, E K. Barto, Jeffrey D. Weidenhamer, D Cipollini
Fungal Superhighways: Do Common Mycorrhizal Networks Enhance Belowground Communication?, E K. Barto, Jeffrey D. Weidenhamer, D Cipollini
Jeffrey D. Weidenhamer
In many natural communities communication between plants and other organisms below ground drives community dynamics. This communication is primarily through the release and detection of infochemicals, which must traverse the soil matrix to be effective. In this opinion article, we propose the Network Enhanced Bioactive Zone (NEBaZ) model, which posits that common mycorrhizal networks (CMNs) increase the bioactive zones of infochemicals by serving as superhighways directly connecting plants below ground. Here we argue that infochemical transport via CMNs allows for systemic defense signaling across plant populations and directed allelochemical delivery to target plants. Plant-animal interactions may also be facilitated by …
Bioavailability Of Cadmium In Inexpensive Jewelry, Jeffrey D. Weidenhamer, Jennifer Miller, Daphne Guinn, Janna Pearson
Bioavailability Of Cadmium In Inexpensive Jewelry, Jeffrey D. Weidenhamer, Jennifer Miller, Daphne Guinn, Janna Pearson
Jeffrey D. Weidenhamer
BACKGROUND: High cadmium (Cd) concentrations have recently been found in some inexpensive jewelry. In response, the US Consumer Product Safety Commission (CPSC) has issued five recalls of children’s jewelry products for Cd contamination. However, there is no formal standard for Cd in jewelry and few data exist regarding potential exposures. OBJECTIVES: We evaluated the bioavailability of Cd in 86 components of 57 jewelry items found to contain high levels of Cd (>10,000 ppm) by X-ray fluorescence (XRF), using extractions which simulate mouthing or swallowing of jewelry items. METHODS: Jewelry was screened for Cd content by XRF. Bioavailability was measured …
Evidence Of Recycling Of Lead Battery Waste Into Highly Leaded Jewelry, Jeffrey D. Weidenhamer, Micheal L. Clement
Evidence Of Recycling Of Lead Battery Waste Into Highly Leaded Jewelry, Jeffrey D. Weidenhamer, Micheal L. Clement
Jeffrey D. Weidenhamer
Inexpensive highly leaded jewelry, much of it imported from China, remains widely available in the United States. The source materials for these items are unknown. Due to the low cost of much of this trinket jewelry, it seems likely that scrap materials may be used in their manufacture. Thirty-nine jewelry items previously determined to contain 90% or more lead by weight were analyzed for antimony content. The average antimony content of these thirty-nine items was 3.0%. The range of antimony content in the samples was from 0.3% to 6.2% antimony by weight, with twenty-seven of the samples in the range …
Leaded Electronic Waste Is A Possible Material For Lead-Contaminated Jewelry, Jeffrey D. Weidenhamer, Michael L. Clement
Leaded Electronic Waste Is A Possible Material For Lead-Contaminated Jewelry, Jeffrey D. Weidenhamer, Michael L. Clement
Jeffrey D. Weidenhamer
Highly leaded jewelry, often imported from China, remains widely available in the United States. Leaded electronic waste is exported from the United States to several Asian countries where solder is recovered and circuit boards are stripped of parts in small workshops. To assess whether electronic waste is being recycled into the jewelry, lead, tin and copper content of highly leaded jewelry samples were determined by atomic absorption spectrometry. Sixteen jewelry items previously determined to contain 20–80% lead by weight were analyzed. Samples were digested in nitric acid for analysis of lead and copper, and in aqua regia for analysis of …