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https://www.readbyqxmd.com/read/28425430/dose-assessment-from-chronic-exposure-to-industrial-norm-in-iron-ore-processing
#1
Franck Dal-Molin, Raymond Fisher, David Frost, David R Anderson, David Read
Radiological exposures due to naturally occurring radioactive material (NORM) can occur during a wide range of work-related activities in the mineral processing and chemical industries. However, evaluation of such exposures in industrial settings remains a difficult exercise owing inter alia to the large number of personnel, operations and plants affected; assumptions that often have to be made concerning the actual duration and frequency of exposures; the complex chemistry and radioactive disequilibria involved and typically, the paucity of historical data...
April 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28414527/advantages-and-limitations-of-in-vitro-and-in-vivo-methods-of-iron-and-zinc-bioavailability-evaluation-in-the-assessment-of-biofortification-program-effectiveness
#2
Desirrê Morais Dias, Neuza Maria Brunoro Costa, Marilia Regini Nutti, Elad Tako, Hércia Stampini Duarte Martino
Biofortification aims to improve the micronutrient concentration of staple food crops through the best practices of breeding and modern biotechnology. However, increased zinc and iron concentrations in food crops may not always translate into proportional increases in absorbed zinc (Zn) and iron (Fe). Therefore, assessing iron and zinc bioavailability in biofortified crops is imperative to evaluate the efficacy of breeding programs. This review aimed to investigate the advantages and limitations of in vitro and in vivo methods of iron and zinc bioavailability evaluation in the assessment of biofortification program effectiveness...
April 17, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28405214/a-real-time-phenotyping-framework-using-machine-learning-for-plant-stress-severity-rating-in-soybean
#3
Hsiang Sing Naik, Jiaoping Zhang, Alec Lofquist, Teshale Assefa, Soumik Sarkar, David Ackerman, Arti Singh, Asheesh K Singh, Baskar Ganapathysubramanian
BACKGROUND: Phenotyping is a critical component of plant research. Accurate and precise trait collection, when integrated with genetic tools, can greatly accelerate the rate of genetic gain in crop improvement. However, efficient and automatic phenotyping of traits across large populations is a challenge; which is further exacerbated by the necessity of sampling multiple environments and growing replicated trials. A promising approach is to leverage current advances in imaging technology, data analytics and machine learning to enable automated and fast phenotyping and subsequent decision support...
2017: Plant Methods
https://www.readbyqxmd.com/read/28402316/effect-of-anaerobic-digestion-and-liming-on-plant-availability-of-phosphorus-in-iron-and-aluminium-precipitated-sewage-sludge-from-primary-wastewater-treatment-plants
#4
Emilio Alvarenga, Anne Falk Øgaard, Lasse Vråle
More efficient plant utilisation of the phosphorus (P) in sewage sludge is required because rock phosphate is a limited resource. To meet environmental legislation thresholds for P removal from wastewater (WW), primary treatment with iron (Fe) or aluminium (Al) coagulants is effective. There is also a growing trend for WW treatment plants (WWTPs) to be coupled to a biogas process, in order to co-generate energy. The sludge produced, when stabilised, is used as a soil amendment in many countries. This study examined the effects of anaerobic digestion (AD), with or without liming as a post-treatment, on P release from Fe- and Al-precipitated sludges originating from primary WWTPs...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28402308/phyto-dewatering-of-sewage-sludge-using-panicum-repens-l
#5
A S El-Gendy, H I El-Kassas, T M A Razek, H Abdel-Latif
Experiments in the field environment have been conducted to study the growth of Panicum repens L., an aquatic plant, in the sewage sludge matrix. The experiments were also carried out to investigate the ability of this plant to dewater sewage sludge to increase the capacity of conventional drying beds. In addition, the ability of Panicum repens L. to reduce the sludge contents of certain elements (copper (Cu), Iron (Fe), Sodium (Na), lead (Pb), and Zinc (Zn)) was also investigated. All experiments were carried out in batch reactors...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28401463/crop-specific-plant-growth-promoting-effects-of-accd-enzyme-and-siderophore-producing-and-cynogenic-fluorescent-pseudomonas
#6
Priyanka, Toshy Agrawal, Anil S Kotasthane, Ashok Kosharia, Renu Kushwah, Najam Waris Zaidi, U S Singh
Fluorescent Pseudomonas, aerobic, Gram-negative bacteria possess many traits that make them well suited as biocontrol and growth promoting agents. Our study revealed that isolates vary in mechanisms involved in the antagonist interactions against pathogen and growth stimulatory effects on host plant. Most of the potential antagonistic fluorescent Pseudomonas identified were avid iron chelators (P233, P201, 176, P76 and, P76). Wide variation in ACCd enzyme production was observed. ACCd enzyme assay tested P141 > P247 > P126, as potential ACCd enzyme producer...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28400510/malate-dependent-fe-accumulation-is-a-critical-checkpoint-in-the-root-developmental-response-to-low-phosphate
#7
Javier Mora-Macías, Jonathan Odilón Ojeda-Rivera, Dolores Gutiérrez-Alanís, Lenin Yong-Villalobos, Araceli Oropeza-Aburto, Javier Raya-González, Gabriel Jiménez-Domínguez, Gabriela Chávez-Calvillo, Rubén Rellán-Álvarez, Luis Herrera-Estrella
Low phosphate (Pi) availability constrains plant development and seed production in both natural and agricultural ecosystems. When Pi is scarce, modifications of root system architecture (RSA) enhance the soil exploration ability of the plant and lead to an increase in Pi uptake. In Arabidopsis, an iron-dependent mechanism reprograms primary root growth in response to low Pi availability. This program is activated upon contact of the root tip with low-Pi media and induces premature cell differentiation and the arrest of mitotic activity in the root apical meristem, resulting in a short-root phenotype...
April 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28393902/nitrate-application-or-p-deficiency-induce-a-decline-in-medicago-truncatula-n2-fixation-by-similar-changes-in-the-nodule-transcriptome
#8
Rebecca Liese, Joachim Schulze, Ricardo A Cabeza
Nitrogen fixation of Medicago truncatula is regulated by the nitrogen status of leaves through inducing a repeatedly occurring 24-h nodule activity rhythm that reduces per day nitrogen fixation. The hypotheses of the present study were that (1) long-term moderate whole-plant P deficiency in Medicago truncatula induces an according daily rhythm in nitrogenase activity comparable to that induced by nitrate application and (2), the changes in the nodule transcriptome that go along with a strong nitrogenase activity decline during the afternoon would be similar under P deficiency or after nitrate supply...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28391935/gas-phase-and-particle-phase-pcdd-f-congener-distributions-in-the-flue-gas-from-an-iron-ore-sintering-plant
#9
Xiaolong Liu, Meng Ye, Xue Wang, Wen Liu, Tingyu Zhu
The activated carbon injection-circulating fluidized bed (ACI-CFB)-bag filter coupling technique was studied in an iron ore sintering plant. For comparison, the removal efficiencies under the conditions without or with ACI technology were both evaluated. It was found that the polychlorinated dibenzo-p-dioxins and dibenzofuran (PCDD/F) removal efficiency for total international toxic equivalence quantity (I-TEQ) concentration was improved from 91.61% to 97.36% when ACI was employed, revealing that ACI was very conducive to further controlling the PCDD/F emissions...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28390898/ethylene-response-factor-aterf72-negatively-regulates-arabidopsis-thaliana-response-to-iron-deficiency
#10
Wei Liu, Qiwei Li, Yi Wang, Ting Wu, Yafei Yang, Xinzhong Zhang, Zhenhai Han, Xuefeng Xu
Ethylene regulates the plant's response to stress caused by iron (Fe) deficiency. However, specific roles of ERF proteins in response to Fe deficiency remain poorly understood. Here, we investigated the role of ERF72 in response to iron deficiency in Arabidopsis thaliana. In this study, the levels of the ethylene response factor AtERF72 increased in leaves and roots induced under the iron deficient conditions. erf72 mutant plants showed increased growth compared to wild type (WT) when grown in iron deficient medium for 5 d...
April 5, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28390236/analysing-the-mechanisms-of-sludge-digestion-enhanced-by-iron
#11
Xiaodi Hao, Jing Wei, Mark C M van Loosdrecht, Daqi Cao
Carbon-neutral operation of wastewater treatment plants (WWTPs) requires enhancing anaerobic digestion (AD) of excess sludge for a higher energy conversion efficiency. Among others, iron has been identified to function on enhancing methane production in AD. As an industrial residual, waste iron scraps (WISs) have been reported as potentially enhancing CH4 production in AD. With this study, the mechanisms of AD enhanced by WISs are analysed in a two-phase process: acidogenic phase (AP) and methanogenic phase (MP)...
March 25, 2017: Water Research
https://www.readbyqxmd.com/read/28390234/metallic-iron-for-safe-drinking-water-provision-considering-a-lost-knowledge
#12
REVIEW
Hezron T Mwakabona, Arnaud Igor Ndé-Tchoupé, Karoli N Njau, Chicgoua Noubactep, Kerstin D Wydra
Around year 1890, the technology of using metallic iron (Fe(0)) for safe drinking water provision was already established in Europe. The science and technology to manufacture suitable Fe(0) materials were known and further developed in this period. Scientists had then developed skills to (i) explore the suitability of individual Fe(0) materials (e.g. iron filling, sponge iron) for selected applications, and (ii) establish treatment processes for households and water treatment plants. The recent (1990) discovery of Fe(0) as reactive agent for environmental remediation and water treatment has not yet considered this ancient knowledge...
March 2, 2017: Water Research
https://www.readbyqxmd.com/read/28388451/human-and-livestock-waste-as-a-reduced-carbon-source-contributing-to-the-release-of-arsenic-to-shallow-bangladesh-groundwater
#13
K J Whaley-Martin, B J Mailloux, A van Geen, B C Bostick, K M Ahmed, I Choudhury, G F Slater
Recent studies have demonstrated that the supply of relatively young organic carbon stimulates the release of arsenic to groundwater in Bangladesh. This study explores the potential role of human and livestock waste as a significant source of this carbon in a densely populated rural area with limited sanitation. Profiles of aquifer sediment samples were analyzed for phytosterols and coprostanol to assess the relative contributions of plant-derived and human/livestock waste-derived organic carbon at two well-characterized sites in Araihazar...
April 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28386232/transcriptomic-profiles-reveal-the-interactions-of-cd-zn-in-dwarf-polish-wheat-triticum-polonicum-l-roots
#14
Yi Wang, Xiaolu Wang, Chao Wang, Fan Peng, Ruijiao Wang, Xue Xiao, Jian Zeng, Houyang Kang, Xing Fan, Lina Sha, Haiqin Zhang, Yonghong Zhou
Different intra- or interspecific wheat show different interactions of Cd/Zn. Normally, Zn has been/being widely utilized to reduce the Cd toxicity. In the present study, the DPW seedlings exhibited strong Cd tolerance. Zn and Cd mutually inhibited their uptake in the roots, showed antagonistic Cd/Zn interactions. However, Zn promoted the Cd transport from the roots to shoots, showed synergistic. In order to discover the interactive molecular responses, a transcriptome, including 123,300 unigenes, was constructed using RNA-Sequencing (RNA-Seq)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28385337/mobilization-of-iron-by-plant-borne-coumarins
#15
REVIEW
Huei-Hsuan Tsai, Wolfgang Schmidt
Iron is one of the most abundant elements in soils, but its low phytoavailability at high pH restricts plant communities on alkaline soils to taxa that have evolved efficient strategies to increase iron solubility. Recent evidence provides support for a previously underestimated role of root-secreted coumarins in mobilizing iron through reduction and chelation as part of an orchestrated strategy evolved to improve the acquisition of iron from recalcitrant pools. Understanding the mechanisms that tune the production of iron-mobilizing coumarins and their intricate interplay with other biosynthesis pathways could yield clues for deciphering the molecular basis of 'iron efficiency' - the ability of plants to thrive on soils with limited iron availability - and may open avenues for generating iron-fortified crops...
April 3, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28380850/rapid-detection-of-drought-stress-in-plants-using-femtosecond-laser-induced-breakdown-spectroscopy
#16
Jeremy N Kunz, Dmitri V Voronine, Ho Wai Howard Lee, Alexei V Sokolov, Marlan O Scully
Drought stress disrupts the balance of macro- and micronutrients and affects the yield of agriculturally and economically significant plants. Rapid detection of stress-induced changes of relative content of elements such as sodium (Na), potassium (K), calcium (Ca) and iron (Fe) in the field may allow farmers and crop growers to counter the effects of plant stress and to increase their crop return. Unfortunately, the analytical methods currently available are time-consuming, expensive and involve elaborate sample preparation such as acid digestion which hinders routine daily monitoring of crop health on a field scale...
April 3, 2017: Optics Express
https://www.readbyqxmd.com/read/28377790/land-use-land-cover-changes-in-detection-of-water-quality-a-study-based-on-remote-sensing-and-multivariate-statistics
#17
Ang Kean Hua
Malacca River water quality is affected due to rapid urbanization development. The present study applied LULC changes towards water quality detection in Malacca River. The method uses LULC, PCA, CCA, HCA, NHCA, and ANOVA. PCA confirmed DS, EC, salinity, turbidity, TSS, DO, BOD, COD, As, Hg, Zn, Fe, E. coli, and total coliform. CCA confirmed 14 variables into two variates; first variate involves residential and industrial activities; and second variate involves agriculture, sewage treatment plant, and animal husbandry...
2017: Journal of Environmental and Public Health
https://www.readbyqxmd.com/read/28376412/effect-of-exogenously-applied-molybdenum-on-its-absorption-and-nitrate-metabolism-in-strawberry-seedlings
#18
Li Liu, Wei Xiao, Ling Li, Dong-Mei Li, Dong-Sheng Gao, Cui-Ying Zhu, Xi-Ling Fu
Molybdenum (Mo)-an essential element of plants-is involved in nitrogen (N) metabolism. Plants tend to accumulate more nitrate and show lower nitrogen use efficiency (NUE) under Mo-deficient conditions. Improving NUE in fruits reduces the negative effect of large applications of chemical fertilizer, but the mechanisms underlying how Mo enhances NUE remain unclear. We cultivated strawberry seedlings sprayed with 0, 67.5, 135, 168.75, or 202.5 g Mo·ha(-1) in a non-soil culture system. The Mo concentration in every plant tissue analyzed increased gradually as Mo application level rose...
March 23, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28373967/defining-the-roles-of-the-cation-diffusion-facilitators-in-fe-2-zn-2-homeostasis-and-establishment-of-their-participation-in-virulence-in-pseudomonas-aeruginosa
#19
Agostina Salusso, Daniel Raimunda
Transporters of the cation diffusion facilitator (CDF) family form dimers that export transition metals from the cytosol. The opportunistic pathogen Pseudomonas aeruginosa encodes three homologous CDF genes, czcD (PA0397), aitP (PA1297), and yiiP (PA3963). The three proteins are required for virulence in a plant host model. Disruption of the aitP gene leads to higher Fe(2+) and Co(2+) sensitivity together with an intracellular accumulation of these ions and to a decreased survival in presence of H2O2. Strains lacking czcD and yiiP showed low Zn(2+) sensitivity...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28373552/phosphatidylinositol-3-phosphate-binding-protein-atph1-controls-the-localization-of-the-metal-transporter-nramp1-in-arabidopsis
#20
Astrid Agorio, Jérôme Giraudat, Michele Wolfe Bianchi, Jessica Marion, Christelle Espagne, Loren Castaings, Françoise Lelièvre, Catherine Curie, Sébastien Thomine, Sylvain Merlot
"Too much of a good thing" perfectly describes the dilemma that living organisms face with metals. The tight control of metal homeostasis in cells depends on the trafficking of metal transporters between membranes of different compartments. However, the mechanisms regulating the location of transport proteins are still largely unknown. Developing Arabidopsis thaliana seedlings require the natural resistance-associated macrophage proteins (NRAMP3 and NRAMP4) transporters to remobilize iron from seed vacuolar stores and thereby acquire photosynthetic competence...
April 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
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