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heavy metal

Pallavi Singh, D Kar Chowdhuri
Increased oxidative stress is one of the major causes of hexavalent chromium [Cr(VI)], a heavy metal with diverse applications and environmental presence, induced neuronal adversities in exposed organism including Drosophila. Sestrin (sesn), an oxidative stress responsive gene, emerges as a novel player in the management of oxidative stress response. It is reported to be regulated by Target of rapamycin (TOR) and the former regulates autophagy and plays an important role in the prevention of neurodegeneration...
October 7, 2017: Chemosphere
Manasi, Sridev Mohapatra, N Rajesh, Vidya Rajesh
In living systems, environmental stress due to biotic and abiotic factors triggers the production of myriad metabolites as a potential mechanism for combating stress. Among these metabolites are the small polycationic aliphatic amine molecules - polyamines, which are ubiquitous in all living organisms. In this work, we demonstrate a correlation between cellular concentration of three major polyamines (putrescine, spermidine and spermine) with lead exposure on bacteria for a period of 6-24 h. We report that indigenously isolated Halomonas sp...
October 18, 2017: Scientific Reports
Yusong Bai, Jean-Hubert Olivier, Hyejin Yoo, Nicholas F Polizzi, Jaehong Park, Jeff Rawson, Michael J Therien
Realizing chromophores that simultaneously possess substantial near-infrared (NIR) absorptivity and long-lived, high-yield triplet excited states is vital for many optoelectronic applications, such as optical power limiting and triplet-triplet annihilation photon upconversion (TTA-UC). However, the energy gap law ensures such chromophores are rare, and molecular engineering of absorbers having such properties has proven challenging. Here, we present a versatile methodology to tackle this design issue by exploiting the ethyne-bridged (polypyridyl)metal(II) (M; M = Ru, Os)-(porphinato)metal(II) (PM'; M' = Zn, Pt, Pd) molecular architecture (M-(PM')n-M), wherein high-oscillator-strength NIR absorptivity up to 850 nm, near-unity intersystem crossing (ISC) quantum yields (ΦISC), and triplet excited-state (T1) lifetimes on the μs timescale are simultaneously realized...
October 18, 2017: Journal of the American Chemical Society
Duong Duc La, Sidhanath V Bhosale, Lathe A Jones, Sheshanath Vishwanath Bhosale
This review article provides a comprehensive analysis of recent development in the field of Aggregation Induced Emisison (AIE)-active tetraphenylethylene (TPE) luminophores, and their applications in biomolecular science. It begins with a discussion of the diverse range of structural motifs that have found particular applications in sensing, and demonstrates that TPE structures and their derivatives have been used for a diverse range of analytes such as such as H+, anions, cations, heavy metals, organic volatiles, and toxic gases...
October 18, 2017: ACS Applied Materials & Interfaces
Xiaowei Zhang, Juxiu Tong, Bill X Hu, Wenshuo Wei
Batch experiments have been carried out to study the adsorption of heavy metals in soils, and the migration and transformation of hexavalent chromium (Cr(VI)) in the soil of a vegetable base were studied by dynamic adsorption and desorption soil column experiments. The aim of this study was to investigate the effect of initial concentration and pH value on the adsorption process of Cr(VI). Breakthrough curve were used to evaluate the capacity of Cr(VI) adsorption in soil columns. The results show that the higher the initial concentration, the worse the adsorption capacity of Cr(VI)...
October 18, 2017: Environmental Science and Pollution Research International
Yulia V Kochergina, Martin Udatný, Vít Penížek, Martin Mihaljevič
Early efforts at remediation of contaminated soils involve overturn or removal of the uppermost soil horizons. We find that such disruption is counterproductive, as it actually increases the mobility of the heavy metals involved. In our study, we sought to replicate in a controlled manner this commonly used remediation strategy and measure Pb, Zn, Cu and As concentrations in all soil horizons-both prior to and 1 year after disruption by trenching. BCR analyses (sequential leaching) indicate that Pb is affected to the greatest degree and is most highly mobile; however, Zn and As remain insoluble, thus partially ameliorating the detrimental effect...
October 18, 2017: Environmental Monitoring and Assessment
Sorin-Claudiu Roşca, Vincent Dorcet, Thierry Roisnel, Jean-François Carpentier, Yann Sarazin
The aminofluoroalcohol N,N,N-(CH2[double bond, length as m-dash]CHCH2CH2-),(CH3OCH2CH2-),(HOC(CF3)2CH2-)N ({RO(F)}H) possessing both a methoxy and an olefin dangling side arms enables the preparation of the heteroleptic charge neutral alkaline earth complexes [{μ(2)-RO(F)}AeN(SiMe2H)2]2 (Ae = Ca, 1; Sr, 2). These O-bridged dinuclear complexes were characterised by NMR spectroscopy and X-ray diffraction crystallography. XRD analysis of 1 and 2 showed that both complexes are stabilised by intramolecular AeF-C and β-agostic AeH-Si secondary interactions, and that the olefin does not bind to the alkaline earths while the methoxy side-arm does...
October 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Shuangshuang Chu, Daoming Wu, Liyin L Liang, Fengdi Zhong, Yaping Hu, Xinsheng Hu, Can Lai, Shucai Zeng
Application of sewage sludge compost (SSC) as a fertilizer on landscaping provides a potential way for the effective disposal of sludge. However, the response of landscape trees to SSC application and the impacts of heavy metals from SSC on soil are poorly understood. We conducted a pot experiment to investigate the effects of SSC addition on Mangifera persiciforma growth and quantified its uptake of heavy metals from SSC by setting five treatments with mass ratios of SSC to lateritic soil as 0%:100% (CK), 15%:85% (S15), 30%:70% (S30), 60%:40% (S60), and 100%:0% (S100)...
October 17, 2017: Scientific Reports
Shuangshuang Chen, Xiaojiao Han, Jie Fang, Zhuchou Lu, Wenmin Qiu, Mingying Liu, Jian Sang, Jing Jiang, Renying Zhuo
The plant natural resistance-associated macrophage protein (Nramp) family plays an important role in tolerance to heavy metal stress. However, few Nramps have been functionally characterized in the heavy metal-accumulating plant Sedum alfredii. Here, Nramp6 was cloned and identified from S. alfredii and its function analyzed in transgenic Arabidopsis thaliana. SaNramp6 cDNA contains an open reading frame of 1, 638 bp encoding 545 amino acids. SaNramp6's expression can be induced by cadmium (Cd) stress, and, after treatment, it peaked at one week and 12 h in the roots and leaves, respectively...
October 17, 2017: Scientific Reports
Daniel J Becker, Matthew M Chumchal, Hugh G Broders, Jennifer M Korstian, Elizabeth L Clare, Thomas R Rainwater, Steven G Platt, Nancy B Simmons, M Brock Fenton
Mercury (Hg) is a persistent and widespread heavy metal with neurotoxic effects in wildlife. While bioaccumulation of Hg has historically been studied in aquatic food webs, terrestrial consumers can become contaminated with Hg when they feed on aquatic organisms (e.g., emergent aquatic insects, fish, and amphibians). However, the extent to which dietary connectivity to aquatic ecosystems can explain patterns of Hg bioaccumulation in terrestrial consumers has not been well studied. Bats (Order: Chiroptera) can serve as a model system for illuminating the trophic transfer of Hg given their high dietary diversity and foraging links to both aquatic and terrestrial food webs...
October 14, 2017: Environmental Pollution
Choe Earn Choong, Shaliza Ibrahim, Yeomin Yoon, Min Jang
In this work, palm shell waste powder activated carbon coated by magnesium silicate (PPAC-MS) were synthesized by the impregnation of magnesium silicate (MgSiO3) using economical material (silicon dioxide powder) via mild hydrothermal approach for the first time. As an effective adsorbent, PPAC-MS simultaneously removes BPA and Pb(II) in single and binary mode. Surprisingly, PPAC-MS exhibited a homogeneous thin plate mesh-like structure, as well as meso- and macropores with a high surface area of 772.1m(2)g(-1)...
October 14, 2017: Ecotoxicology and Environmental Safety
Seyed Sajjad Hosseini, Amir Lakzian, Akram Halajnia, Hossein Hammami
It was found that using chelating agents increases the efficiency of heavy metal extraction however they may have negative effects on soil ecosystem quality. A pot experiment was conducted in a completely randomized design with three replications in order to evaluate the effect of EDTA and Olive Husk Extract (OHE) on some chemical and biological properties of the Pb-contaminated soil. The experimental treatments included EDTA (2 g Na2EDTA salt per kg soil), OHE (2 g TDS of OHE per kg soil) and control (without the chelating agent)...
October 17, 2017: International Journal of Phytoremediation
Wenjie Zhang, Jianguo Jiang, Kaimin Li, Tianran Li, De' An Li, Jiaming Wang
We performed pot experiments with canola plants (Brassica campestris L.) to evaluate the effect of eight soil conditioners on the amendment of vanadium (V)-contaminated soil based on analysis of the growth of canola plants and the uptake, bioaccumulation, and translocation of heavy metals. Tested soil conditioners included polyacrylamide (PAM), sepiolite, humic acid (HAC), peat, sludge compost (SC), bentonite, lime, and fly ash. Results from the analysis of the growth of canola plants and the analysis of variance showed that the best soil conditioners for V-contaminated soil were 0...
October 17, 2017: International Journal of Phytoremediation
Roslinda Shamsudin, Farah 'Atiqah Abdul Azam, Muhammad Azmi Abdul Hamid, Hamisah Ismail
The aim of this study was to prepare β-wollastonite using a green synthesis method (autoclaving technique) without organic solvents and to study its bioactivity. To prepare β-wollastonite, the precursor ratio of CaO:SiO₂ was set at 55:45. This mixture was autoclaved for 8 h and later sintered at 950 °C for 2 h. The chemical composition of the precursors was studied using X-ray fluorescence (XRF), in which rice husk ash consists of 89.5 wt % of SiO₂ in a cristobalite phase and calcined limestone contains 97...
October 17, 2017: Materials
Wenwen Deng, Yuan Quan, Shengzhi Yang, Lijuan Guo, Xiuli Zhang, Shuliang Liu, Shujuan Chen, Kang Zhou, Li He, Bei Li, Yunfu Gu, Shaohua Zhao, Likou Zou
This study aims to demonstrate the antibiotic resistance and its association with disinfectant and heavy metal resistance in 152 Salmonella isolates recovered from retail foods of animal origins. Susceptibility testing demonstrated that 92.8% isolates were resistant to at least one antibiotic, and the resistance was highest to oxytetracycline (80.9%), followed by trimethoprim (64.5%), amoxicillin (28.9%), ampicillin (28.3%), levofloxacin (21.7%), ciprofloxacin (16.4%), and gentamicin (10.5%), respectively. The blaTEM and tetA genes (44...
October 17, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Nazish Mazhar Ali, Syed Abdullah Mazhar, Bushra Mazhar, Anum Imtiaz, Saiqa Andleeb
The present work was carried out to study bacterial pathogens isolated from wheat field water and also effect of some plant extracts on these bacterial pathogens. Five bacterial strains were isolated from wheat field water. Different morphological and biochemical tests were performed to identify and characterize bacterial pathogens. Among isolated strains two belonged to genus Staphylococcus sp., other two were Pseudomonas spp. and one strain belonged to genus Salmonella sp. Effect of various parameters such as temperature, pH, antibiotics and heavy metals of these pathogens were also studied...
July 2017: Pakistan Journal of Pharmaceutical Sciences
Muhammad Ahsan Riaz, Amtul Bari Tabinda Akhtar, Ayesha Riaz, Ghulam Mujtaba, Muhammad Ali, Beenish Ijaz
The determination of heavy metals in blood is an important occupational environmental toxicology screening procedure. The aim of study was to determine the concentrations of Pb, Cd, Cr and Ni in blood samples of iron and steel foundry workplace exposed workers under routine clinical laboratory conditions. The method was employed for the quantitative determination of lead, cadmium, chromium and nickel in workplace environment particulate matter blood samples from iron and steel foundry workers and in unexposed controls...
July 2017: Pakistan Journal of Pharmaceutical Sciences
Ajay Kumar, Sumit Sharma, Rohit Mehra, Priya Kanwar, Rosaline Mishra, Inderpreet Kaur
Radon concentration was measured in water samples of 41 different locations from Udhampur district of Jammu & Kashmir, India, by using RAD7 and Smart RnDuo monitor. The variation of radon concentration in water ranged from 1.44 ± 0.31 to 63.64 ± 2.88 Bq L(-1), with a mean value of 28.73 Bq L(-1) using RAD7 and 0.64 ± 0.28 to 52.65 ± 2.50 Bq L(-1), with a mean value of 20.30 Bq L(-1) using Smart RnDuo monitor, respectively. About 17.07% of the studied water samples recorded to display elevated radon concentration above the reference range suggested by United Nation Scientific Committee on the Effects of Atomic Radiations (UNSCEAR)...
October 16, 2017: Environmental Geochemistry and Health
Navdeep Singh, Manpreet Kaur, Jatinder Kaur Katnoria
Suitability of surface water of Kanjli wetland, Punjab (India) during the period of 2013-2015 was assessed for drinking, irrigation and aquatic life using a water quality index (WQI), heavy metal pollution index (HPI) and aquatic toxicity index (ATI). WQI was calculated using 14 physico-chemical parameters while HPI determination used nine heavy metals like As, Cd, Co, Cr, Cu, Fe, Mn, Pb and Zn. WQI revealed that Kanjli wetland contained medium quality water (irrigation and aquatic life). Cr, Cd and Co exceeded desirable limits of World Health Organization (WHO, Guidelines for drinking-water quality, World Health Organization, Geneva, 2011) and Indian drinking water standard (2012) during all the three seasons (monsoon, post monsoon and winter)...
October 16, 2017: Bulletin of Environmental Contamination and Toxicology
Joanna Grzyb, Katarzyna Gieczewska, Justyna Łabuz, Olga Sztatelman
Direct interaction of ferredoxin:NADP(+) oxidoreductase (FNR) with thylakoid membranes was postulated as a part of the cyclic electron flow mechanism. In vitro binding of FNR to digalactosyldiacylglycerol and monogalactosyldiacylglycerol membranes was also shown. In this paper we deal with the latter interaction in more detail describing the effect for two FNR forms of Synechocystis PCC 6803. The so-called short FNR (sFNR) is homologous to FNR from higher plant chloroplasts. The long FNR (lFNR) form contains an additional domain, responsible for the interaction with phycobilisomes...
October 13, 2017: Biochimica et Biophysica Acta
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