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https://www.readbyqxmd.com/read/28528502/influence-of-amendments-on-cd-and-zn-uptake-and-accumulation-in-rice-oryza-sativa-l-in-contaminated-soil
#1
Patompong Saengwilai, Weeradej Meeinkuirt, John Pichtel, Preeyaporn Koedrith
Cadmium is a toxic metallic element that poses serious human health risks via consumption of contaminated agricultural products. The effect of mixtures of dicalcium phosphate and organic amendments, namely cow manure (MD) and leonardite (LD), on Cd and Zn uptake of three rice cultivars (KDML105, KD53, and PSL2) was examined in mesocosm experiments. Plant growth, Cd and Zn accumulation, and physicochemical properties of the test soils were investigated before and after plant harvest. Amendment application was found to improve soil physicochemical properties; in particular, soil organic matter content and nutrient (N, P, K, Ca, and Mg) concentrations increased significantly...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528500/using-poly-glutamic-acid-as-soil-washing-agent-to-remediate-heavy-metal-contaminated-soils
#2
Zong-Han Yang, Cheng-Di Dong, Chiu-Wen Chen, Yih-Terng Sheu, Chih-Ming Kao
The extraction efficiency of heavy metals from soils using three forms of gamma poly-glutamic acid (γ-PGA) as the washing agents was investigated. Controlling factors including agent concentrations, extraction time, pH, and liquid to soil ratio were evaluated to determine the optimum operational conditions. The distribution of heavy metal species in soils before and after extraction processes was analyzed. Up to 46 and 74% of heavy metal removal efficiencies were achieved with one round and a sequential extraction process using H-bonding form of γ-PGA (200 mM) with washing time of 40 min, liquid to solid ratio of 10 to 1, and pH of 6...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528262/stable-isotope-tracing-of-ni-and-cu-pollution-in-north-east-norway-potentials-and-drawbacks
#3
Hana Šillerová, Vladislav Chrastný, Martina Vítková, Anna Francová, Jan Jehlička, Marissa R Gutsch, Jana Kocourková, Paul E Aspholm, Lars O Nilsson, Tore F Berglen, Henning K B Jensen, Michael Komárek
The use of Ni and Cu isotopes for tracing contamination sources in the environment remains a challenging task due to the limited information about the influence of various biogeochemical processes influencing stable isotope fractionation. This work focuses on a relatively simple system in north-east Norway with two possible endmembers (smelter-bedrock) and various environmental samples (snow, soil, lichens, PM10). In general, the whole area is enriched in heavy Ni and Cu isotopes highlighting the impact of the smelting activity...
May 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28528105/vulnerability-of-global-food-production-to-extreme-climatic-events
#4
F Yeni, H Alpas
It is known that the frequency, intensity or duration of the extreme climatic events have been changing substantially. The ultimate goal of this study was to identify current vulnerabilities of global primary food production against extreme climatic events, and to discuss potential entry points for adaptation planning by means of an explorative vulnerability analysis. Outcomes of this analysis were demonstrated as a composite index where 118 country performances in maintaining safety of food production were compared and ranked against climate change...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28527917/spatial-distribution-of-vanadium-and-microbial-community-responses-in-surface-soil-of-panzhihua-mining-and-smelting-area-china
#5
Xuelong Cao, Muhe Diao, Baogang Zhang, Hui Liu, Song Wang, Meng Yang
Spatial distribution of vanadium in surface soils from different processing stages of vanadium-bearing titanomagnetite in Panzhihua mining and smelting area (China) as well as responses of microbial communities including bacteria and fungi to vanadium were investigated by fieldwork and laboratory incubation experiment. The vanadium contents in this region ranged from 149.3 to 4793.6 mg kg(-1), exceeding the soil background value of vanadium in China (82 mg kg(-1)) largely. High-throughput DNA sequencing results showed bacterial communities from different manufacturing locations were quite diverse, but Bacteroidetes and Proteobacteria were abundant in all samples...
May 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28526990/how-does-supplementary-feeding-affect-endoparasite-infection-in-wild-boar
#6
Ragne Oja, Kaisa Velström, Epp Moks, Pikka Jokelainen, Brian Lassen
Supplementary feeding is widely used in game management but may aid the transmission of parasites. Firstly, feeding sites attract animals and may be regarded as high-risk areas for parasite transmission. Secondly, high host population densities resulting from and supported by supplementary feeding, as well as accumulation of parasites in the environment, may increase parasite prevalence. Our aim was to investigate whether host density or the number of feeding sites drives endoparasite infection in an Estonian wild boar (Sus scrofa) population...
May 19, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28526789/a-novel-iron-dependent-enzyme-that-catalyzes-the-initial-step-in-the-biodegradation-of-n-nitroglycine-by-variovorax-sp-strain-js1663
#7
Kristina M Mahan, Hangping Zheng, Tekle T Fida, Ronald J Parry, David E Graham, Jim C Spain
Nitramines are key constituents of most of the explosives in current use and consequently contaminate soil and groundwater at many military facilities around the world. Toxicity from nitramine contamination poses a health risk to plants and animals, thus understanding how nitramines are biodegraded is critical to environmental remediation. The biodegradation of synthetic nitramine compounds such as hexahydro-1,3,5-trinitro-1,3,5- triazine (RDX) has been studied for decades, but little is known about the catabolism of naturally produced nitramine compounds...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28526548/at-the-nexus-of-antibiotics-and-metals-the-impact-of-cu-and-zn-on-antibiotic-activity-and-resistance
#8
REVIEW
Keith Poole
Environmental influences on antibiotic activity and resistance can wreak havoc with in vivo antibiotic efficacy and, ultimately, antimicrobial chemotherapy. In nature, bacteria encounter a variety of metal ions, particularly copper (Cu) and zinc (Zn), as contaminants in soil and water, as feed additives in agriculture, as clinically-used antimicrobials, and as components of human antibacterial responses. Importantly, there is a growing body of evidence for Cu/Zn driving antibiotic resistance development in metal-exposed bacteria, owing to metal selection of genetic elements harbouring both metal and antibiotic resistance genes, and metal recruitment of antibiotic resistance mechanisms...
May 16, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28526064/seasonal-variation-in-the-prevalence-of-toxocara-eggs-on-children-s-playgrounds-in-the-city-of-hanover-germany
#9
Annika Kleine, Andrea Springer, Christina Strube
BACKGROUND: Roundworms of the genus Toxocara are worldwide distributed zoonotic parasites of carnivores. Based on case numbers and the potential impact on human health, the Centers for Disease Control and Prevention (CDC) categorised toxocarosis as one of the most important neglected parasitic diseases. As contact with contaminated soil, e.g. in sandpits, is considered the primary transmission route, data on playground contamination are needed to assess infection risk for children. Here, playground contamination rates and their seasonal variation in the city of Hanover, Germany, were investigated...
May 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28525879/application-of-calcium-peroxide-in-water-and-soil-treatment-a-review
#10
REVIEW
Shuguang Lu, Xiang Zhang, Yunfei Xue
Calcium peroxide (CP) has been progressively applied in terms of environmental protection due to its certain physical and chemical properties. This review focuses on the latest progresses in the applications of CP in water and soil treatment, including wastewater treatment, surface water restoration and groundwater and soil remediation. The stability of CP makes it an effective solid phase to supply H2O2 and O2 for aerobic biodegradation and chemical degradation of contaminants in water and soil. CP has exerted great performance in the removal of dyes, chlorinated hydrocarbons, petroleum hydrocarbons, pesticides, heavy metals and various other contaminants...
May 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28525815/an-integrated-approach-to-study-the-risk-from-landfill-soil-of-delhi-chemical-analyses-in-vitro-assays-and-human-risk-assessment
#11
Swati, Pooja Ghosh, Indu Shekhar Thakur
In the present study, landfill soil of three municipal solid waste landfill sites of Delhi, India were toxico-chemically analyzed for human risk assessment as inadequate information is available on the possible health effects of the contaminants present in landfill soil. The landfill soil samples were prepared for analyzing heavy metal concentration, organic contaminants and toxicity analysis separately. Composite soil sample collected from three landfill sites were analyzed for heavy metal by ICP-AES. Metal concentration so obtained was below the permissible limit of soil but higher than the set limits for effluent...
May 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28523620/occurrence-and-fractionation-of-cr-along-the-loushan-river-affected-by-a-chromium-slag-heap-in-east-china
#12
Youyuan Chen, Bingbing Dong, Jia Xin
This study investigated the chromium (Cr) occurrence and distribution along the Loushan River adjacent to a chromium slag heap. The speciation and chemical fractionation of Cr in different environmental media were determined. The potential ecological risks for the surrounding environment were assessed on the basis of both potential ecological risk index (RI) and risk assessment code (RAC). The results show that the surface soil experienced severe Cr contamination with Cr(T) and Cr(VI) values of 3220 ± 6266 and 64 ± 94 mg/kg, respectively, even though the chromium slag heap had already been removed...
May 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28523616/the-effect-of-multiple-contamination-of-soil-on-lmw-and-mmw-pahs-accumulation-in-the-roots-of-rubus-fruticosus-l-naturally-growing-near-the-copper-mining-and-smelting-complex-bor-east-serbia
#13
Slađana Č Alagić, Vesna P Stankov Jovanović, Violeta D Mitić, Jelena S Nikolić, Goran M Petrović, Snežana B Tošić, Gordana S Stojanović
Samples of roots and spatial soils of native Rubus fruticosus L. were collected from the spots positioned at different distances from the copper smelter and city heating plants in the industrial zone of the town of Bor (Serbia) and subjected to chemical analyses in order to determine the content of several heavy metals, and 15 priority polycyclic aromatic hydrocarbons (PAHs). In this study, the results for 9 low and medium molecular weight PAHs (LMW and MMW PAHs) are represented and processed using the calculation of bio-concentration factors and statistical methods such as hierarchical cluster analysis and Pearson's correlation study with the aim of investigating the plant capabilities for their uptake from the soil and later accumulation into the root tissue, under the hostile circumstances of multiple contamination...
May 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28521510/differential-growth-promotion-of-poplar-and-birch-inoculated-with-three-dark-septate-endophytes-in-two-trace-element-contaminated-soils
#14
Charlotte Berthelot, Damien Blaudez, Corinne Leyval
Dark septate endophytes (DSEs) are abundant in stressful environments, including trace element- (TE-) enriched soils. However, knowledge about the effects of DSEs on plant growth in such soils is poor compared to the well-known mycorrhizal fungi. The aim of this work was to evaluate the effects of three DSE strains isolated from TE-contaminated soils on the growth and mineral nutrition of Betula pendula and Populus tremula x alba grown on two contrasting TE-polluted soils. The three DSEs evenly colonized the two plant species in both soils...
May 19, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28521168/ecotoxicity-testing-and-environmental-risk-assessment-of-iron-nanomaterials-for-sub-surface-remediation-recommendations-from-the-fp7-project-nanorem
#15
Rune Hjorth, Claire Coutris, Nhung H A Nguyen, Alena Sevcu, Juliàn Alberto Gallego-Urrea, Anders Baun, Erik J Joner
Nanoremediation with iron (Fe) nanomaterials opens new doors for treating contaminated soil and groundwater, but is also accompanied by new potential risks as large quantities of engineered nanomaterials are introduced into the environment. In this study, we have assessed the ecotoxicity of four engineered Fe nanomaterials, specifically, Nano-Goethite, Trap-Ox Fe-zeolites, Carbo-Iron(®) and FerMEG12, developed within the European FP7 project NanoRem for sub-surface remediation towards a test battery consisting of eight ecotoxicity tests on bacteria (V...
May 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28519901/inhibition-of-soil-microbial-activity-by-nitrogen-based-energetic-materials
#16
Roman G Kuperman, Morgan L Minyard, Ronald T Checkai, Geoffrey I Sunahara, Sylvie Rocheleau, Sabine G Dodard, Louise Paquet, Jalal Hawari
We investigated individual toxicities of nitrogen-based energetic materials (EMs) 2,4-dinitrotoluene (2,4-DNT); 2-amino-4,6-dinitrotoluene (2-ADNT); 4-amino-2,6-dinitrotoluene (4-ADNT); and nitroglycerin (NG) on microbial activity in Sassafras sandy loam (SSL) soil, which has physicochemical characteristics that support "very high" qualitative relative bioavailability for organic chemicals. Batches of SSL soil for basal respiration (BR) and substrate-induced respiration (SIR) assays were separately amended with individual EMs or acetone carrier control...
May 18, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28516984/cadmium-transfer-from-contaminated-soils-to-the-human-body-through-rice-consumption-in-southern-jiangsu-province-china
#17
Tianyuan Li, Qing Chang, Xuyin Yuan, Jizhou Li, Godwin A Ayoko, Ray L Frost, Hongyan Chen, Xinjian Zhang, Yinxian Song, Wenzhi Song
Consumption of crops grown in cadmium-contaminated soils is an important Cd exposure route to humans. The present study utilizes statistical analysis and in vitro digestion experiments to uncover the transfer processes of Cd from soils to the human body through rice consumption. Here, a model was created to predict the levels of bioaccessible Cd in rice grains using phytoavailable Cd quantities in the soil. During the in vitro digestion, a relatively constant ratio between the total and bioaccessible Cd in rice was observed...
May 18, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28516483/capabilities-and-limitations-of-dgge-for-the-analysis-of-hydrocarbonoclastic-prokaryotic-communities-directly-in-environmental-samples
#18
Dina M Al-Mailem, Mayada K Kansour, Samir S Radwan
Prokaryotic communities in pristine and oil-contaminated desert soil, seawater, and hypersaline coastal soil were analyzed using culture-dependent and culture-independent approaches. The former technique was the dilution-plating method. For the latter, total genomic DNA was extracted and the 16S rRNA genes were amplified using a universal bacterial primer pair and primer pairs specific for Actinobacteria, Gammaproteobacteria, and Archaea. The amplicons were resolved using denaturing gradient gel electrophoresis (DGGE) and sequenced, and the sequences were compared to those in GenBank...
May 18, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28513456/aflatoxins-characteristics-and-impact-on-human-health
#19
Anna Kowalska, Katarzyna Walkiewicz, Paweł Kozieł, Małgorzata Muc-Wierzgoń
Some molds commonly occurring in the natural environment produce mycotoxins in the process of secondary metabolism. Aspergillus flavus and A. parasiticus are species of molds, which are responsible for the production of aflatoxins and are crucial in the pathogenesis of human diseases. Aspergillus species present in decaying plants, the soil and their spores are transferred via air currents and insects to crops and food storages. Aflatoxins B1, B2, G1, G2, M1 and M2 are the most common derivatives of aflatoxins...
May 5, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28512466/salinity-stress-does-not-affect-root-uptake-dissemination-and-persistence-of-salmonella-in-sweet-basil-ocimum-basilicum
#20
Nirit Bernstein, Shlomo Sela Saldinger, Nativ Dudai, Elena Gorbatsevich
Crop produce can be contaminated in the field during cultivation by bacterial human pathogens originating from contaminated soil or irrigation water. The bacterial pathogens interact with the plant, can penetrate the plant via the root system and translocate and survive in above-ground tissues. The present study is first to investigate effects of an abiotic stress, salinity, on the interaction of plants with a bacterial human pathogen. The main sources of human bacterial contamination of plants are manures and marginal irrigation waters such as treated or un-treated wastewater...
2017: Frontiers in Plant Science
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