Radon Reduction:
            <i>Radon and its Decay Products in Indoor Air</i>
            . William W. Nazaroff and Anthony V. Nero, Jr., Eds. Wiley-Interscience, New York, 1988. xxvi 518 pp., illus. $75. Environmental Science and Technology.

Eaton, Ross

doi:10.1126/science.241.4868.990.a

Cited by 2 publications

(6 citation statements)

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“…28 After 1 day of elimination, caterpillars that had received the maximum dose retained Au ENMs in the tissues surrounding the medial and posterior midgut in concentrations detectable by synchrotron μXRF scans (Figure 4, detection limit ∼1 mg kg −1 ). 27 Au ENMs are not present in detectable concentrations in the anterior midgut (abdominal segment 1, Figure 4a) but are evident in the posterior anterior midgut (abdominal segment 2, Figure 4c), medial midgut (abdominal segment 4, Figure 4e) and posterior midgut (abdominal segment 5, Figure 4g). Au ENMs are also detected within caterpillars that experienced 7 days of elimination and had received only 1 μg Au ENMs (Figure 5).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…24−26 To investigate regional differences in Au ENM bioaccumulation, hornworm cross sections were keyed to standard anatomical regions (Figure 1). 27 Synchotron X-ray Analysis. Scanning X-ray fluorescence microscopic measurements of Au were collected at the Au L-α 1 emission line (9713 eV) using beamline X-26A at the National Synchrotron Light Source at Brookhaven National Laboratory (Upton, NY).…”

Section: ■ Introductionmentioning

confidence: 99%

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Bioaccumulation of Gold Nanomaterials by Manduca sextathrough Dietary Uptake of Surface Contaminated Plant Tissue

Judy

Unrine

Rao

et al. 2012

Environ. Sci. Technol.

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We investigated the potential for bioaccumulation of engineered nanomaterials (ENMs) by tobacco hornworm (Manduca sexta) caterpillars resulting from the ingestion of plant tissue surface contaminated with ENMs. Caterpillars were fed tomato leaf tissue that had been surface contaminated with 12 nm tannate coated Au ENMs. After dosing was complete, bulk Au concentrations in individual caterpillars were measured after 0, 1, 4, and 7 days of elimination. Growth, mortality, and ingestion rate were monitored. This experiment revealed (1) no evidence that caterpillars were affected by ingestion of ENM contaminated plant tissue; (2) low bioaccumulation factors (BAF = 0.16) compared to a previous study where hornworm caterpillars were fed plants that had previously bioaccumulated Au ENMs (BAF = 6.2-11.6); (3) inefficient elimination of accumulated Au ENMs not associated with hornworm gut contents; and (4) regional differences in translocation of Au ENMs into tissues surrounding the hornworm gut, possibly the result of the interaction between ENM surface chemistry and regional differences in hornworm gut chemistry. These data, along with previous findings, indicate that although ENMs resuspended from soil onto plant surfaces by wind, water, biota, and/or mechanical disturbances are bioavailable to terrestrial consumers, bioaccumulation efficiency may be much lower via this pathway than through direct trophic exposure.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Bioaccumulation of Gold Nanomaterials by Manduca sextathrough Dietary Uptake of Surface Contaminated Plant Tissue

Judy

Unrine

Rao

et al. 2012

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Entire hornworms were embedded in hydrophilic glycol methacrylate resin and sectioned to approximately 1 mm using a diamond wafering blade. Several hornworm sections were cut perpendicularly to the body axis for each sample and were each keyed to standard anatomical divisions of the Manduca sexta larvae (30). Hornworm sections from the midgut (30) and whole tobacco leaves were mounted on metal free polyimide film (Kapton; Dupont, Wilmington, DE).…”

Section: Methodsmentioning

confidence: 99%

“…Several hornworm sections were cut perpendicularly to the body axis for each sample and were each keyed to standard anatomical divisions of the Manduca sexta larvae (30). Hornworm sections from the midgut (30) and whole tobacco leaves were mounted on metal free polyimide film (Kapton; Dupont, Wilmington, DE). Hornworm sections were analyzed using X-ray absorption near edge spectroscopy (µXANES) and synchrotron X-ray fluorescence microprobe (µXRF) scans.…”

Section: Methodsmentioning

confidence: 99%

“…Manduca sexta eggs were purchased from Great Lakes Hornworm (Grand Rapids, MI, USA). The hornworms were randomly divided into their individual treatment enclosures at the beginning of the second larval instar, during which the hornworms were 9−18 mm long , . Five hornworms were provided living plants growing in DI, and 10 hornworms each were provided living plants growing in DI that were previously exposed to the 5, 10, and 15 nm Au treatment suspensions as described above.…”

Section: Methodsmentioning

confidence: 99%

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Evidence for Biomagnification of Gold Nanoparticles within a Terrestrial Food Chain

Judy

Unrine

Bertsch

2010

Environ. Sci. Technol.

327

223

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Nanoparticles from the rapidly increasing number of consumer products that contain manufactured nanomaterials are being discharged into waste streams. Increasing evidence suggests that several classes of nanomaterials may accumulate in sludge derived from wastewater treatment and ultimately in soil following land application as biosolids. Little research has been conducted to evaluate the impact of nanoparticles on terrestrial ecosystems, despite the fact that land application of biosolids from wastewater treatment will be a major pathway for the introduction of manufactured nanomaterials to the environment. To begin addressing this knowledge gap, we used the model organisms Nicotiana tabacum L. cv Xanthi and Manduca sexta (tobacco hornworm) to investigate plant uptake and the potential for trophic transfer of 5, 10, and 15 nm diameter gold (Au) nanoparticles (NPs). Samples were analyzed using both bulk analysis by inductively coupled plasma mass spectrometry (ICP-MS) as well as spatially resolved methods such as laser ablation inductively coupled mass spectrometry (LA-ICP-MS) and X-ray fluorescence (μXRF). Our results demonstrate trophic transfer and biomagnification of gold nanoparticles from a primary producer to a primary consumer by mean factors of 6.2, 11.6, and 9.6 for the 5, 10, and 15 nm treatments, respectively. This result has important implications for risks associated with nanotechnology, including the potential for human exposure.

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Radon Reduction: Radon and its Decay Products in Indoor Air . William W. Nazaroff and Anthony V. Nero, Jr., Eds. Wiley-Interscience, New York, 1988. xxvi 518 pp., illus. $75. Environmental Science and Technology.

Cited by 2 publications

References 0 publications

Bioaccumulation of Gold Nanomaterials by Manduca sextathrough Dietary Uptake of Surface Contaminated Plant Tissue

Bioaccumulation of Gold Nanomaterials by Manduca sextathrough Dietary Uptake of Surface Contaminated Plant Tissue

Evidence for Biomagnification of Gold Nanoparticles within a Terrestrial Food Chain

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