Exposure to toxic agents alters organic elemental composition in human fingernails

Schumacher, E. G.; Dindorf, Willi; Dittmar, Manuela

doi:10.1016/j.scitotenv.2008.12.013

Cited by 19 publications

(7 citation statements)

References 13 publications

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“…Table 1. Summary of the composition, density and mass attenuation coefficients for resin (Gawdzik et al 2001), salt, nail phantom, human nail (Schumacher et al 2008, Greaves and Moll 1976, Rutherford and Hawk 1907, tissue phantom, soft tissue (ICRU 1989), bone phantom (ICRU 1989) and bone (ICRU 1989). Attenuation coefficients were calculated using the XCOM database (Berger et al 2005).…”

Section: Methodsmentioning

confidence: 99%

Simultaneous assessment of arsenic and selenium in human nail phantoms using a portable x-ray tube and a detector

2010

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A novel approach to the measurement of arsenic and selenium in nail phantoms is demonstrated. Two-component nail phantoms of 0.7 mm and 1.5 mm thickness were made from a polyester resin-salt mixture and dosed with equal arsenic and selenium concentrations ranging from 0 to 30 microg g(-1). A backing was made to simulate the soft tissue and bone of the great toe. Characteristic x-rays for arsenic and selenium were recorded using a portable x-ray tube and a silicon PiN diode detector. The minimum instrumental detection limits for arsenic and selenium in 0.7 mm solitary nail samples were as follows: 0.510 +/- 0.018 microg g(-1) and 0.519 +/- 0.026 microg g(-1) respectively; for 1.5 mm solitary nail: 0.465 +/- 0.035 microg g(-1) and 0.561 +/- 0.062 microg g(-1); for 0.7 mm nail with backing: 1.522 +/- 0.038 microg g(-1) and 1.401 +/- 0.049 microg g(-1); for 1.5 mm nail with backing: 1.354 +/- 0.054 microg g(-1) and 1.367 +/- 0.068 microg g(-1).

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Section: Methodsmentioning

confidence: 99%

Simultaneous assessment of arsenic and selenium in human nail phantoms using a portable x-ray tube and a detector

2010

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“…After injection of a defined amount of oxygen, the sample was burned at a temperature of 1150°C. The generated different gases were separated according to the purge‐and‐trap principle and the amount of each gas was determined by thermoconductivity …”

Section: Methodsmentioning

confidence: 99%

Hydrothermal pretreatment for the preparation of wool powders

Hou

Shi

et al. 2013

J of Applied Polymer Sci

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Wool powders with low solubility could be easily prepared from wool fibers by combining hydrothermal pretreatment (HTP) and grinding processes. Transforming wool fibers into powders was the first step of exploiting wool as new materials such as bio-thermoplastics. However, wool fibers were difficult to be prepared into powders only by grinding due to their toughness. This article used a chemical-free method to obtain wool powders by grinding HTP-treated wool fibers. Wool fibers after HTP at 130 C for 40 min or above were obviously easier to be broken into snippets with lengths of 25-150 lm after grinding for 1 min and shapeless super-fine powders with diameters of 3-15 lm after ball milling for 10 min. Wool fibers after HTP were brittle mainly owing to decrease of a-helices and SAS bonds. Combination of HTP and grinding could be an eco-friendly and feasible treatment to prepare wool powders on industrial scale.

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“…The moisture content (WC) of soil was determined by mass change after oven-drying at 105 ℃ until the constant weight., pH value was measured by pH meter (Yang et al, 2012). The total nitrogen (TN) available nitrogen (AN), organic matter (OM) and organic carbon (OC) content were determined by Baeumer (1974)) and Schumacher (2009).…”

Section: Determination Of Soil Physicochemical Properties and Nitroge...mentioning

confidence: 99%

Isolation and characterization of Plant Growth-Promoting Rhizobacteria from Cenchrus fungigraminus and their potential role in plant growth promotion

Li¹,

Zhou²,

Li³

et al. 2022

Preprint

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Aims To understand the species composition, the relative content, and diversity of nitrogen fixing bacteria in Cenchrus fungigraminus rhizophere, and to screen nitrogen-fixing bacteria to study their potential role in plant growth promotion. Methods Soil samples were collected from 4 depth (G1, G2, G3 and G4) of C. fungigraminus rhizophere and physical and chemical properties were determined. The diversity and abundance of nitrogen-fixing bacteria and nifH gene copy were analyzed. Nitrogen-fixing bacteria were screened and selected for studying the C. fungigraminus seedlings growth promotion. Results The highest diversity and abundance of nitrogen-fixing bacteria were observed in C. fungigraminus rhizosphere (G2), which mainly included Proteobacteria (93.91%), Actinobacteria (0.42%), Firmicutes (0.18%) and significantly effected by total nitrogen, available nitrogen and depth. The nifH gene copy was also highest (1.56 ± 0.17×107 copies/g) in G2. Rhizobium pusense NO.8 and NO.28 were isolated in G1 and G2, respectively, with nitrogenase activity of 1.45 ± 0.04 and 2.00 ± 0.07 U/g. The promotion experiment revealed that plant height, root length, leaf length of C. fungigramminus seedlings treated with both strains were significantly increased 56.79%, 76.99% and 55.71%, and significantly increased on moisture and total nitrogen of planting soil compare with control (P < 0.05). The available nitrogen, organic matter and organic carbon in soil with R. pusense NO.28 have significantly increased 3.09, 5.77 and 5.77 times. Conclusion Nitrogen-fixing bacteria in C. fungigraminus rhizosphere soil is rich and play a significant role in promoting its seedlings growth. The study provides the development of PGPRs from C. fungigraminus rhizosphere to be biological fertilizers.

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Exposure to toxic agents alters organic elemental composition in human fingernails

Cited by 19 publications

References 13 publications

Simultaneous assessment of arsenic and selenium in human nail phantoms using a portable x-ray tube and a detector

Simultaneous assessment of arsenic and selenium in human nail phantoms using a portable x-ray tube and a detector

Hydrothermal pretreatment for the preparation of wool powders

Isolation and characterization of Plant Growth-Promoting Rhizobacteria from Cenchrus fungigraminus and their potential role in plant growth promotion

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