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Ecotoxicology and Environmental Safety

Jian-Wei Zheng, Su-Li Liu, Song-Hui Lu, Hong-Ye Li, Jie-Sheng Liu, Wei-Dong Yang
Blooms of Aureococcus anophagefferens, referred to as brown tides are responsible for massive mortalities and recruitment failure of some bivalves. However, the molecular mechanisms underlying the toxicity remain elusive despite its biological significance, and the information currently available on the molecular effects is still insufficient. In this study, to evaluate the toxicity and associated mechanism of A. anophagefferens on bivalves, we analyzed the protein expression profiles in digestive glands of the A...
July 11, 2018: Ecotoxicology and Environmental Safety
Thanaa Shalaby, Hesham Hamad, Ebtihag Ibrahim, Ola Mahmoud, Affaf Al-Oufy
Safety of drinking-water is an urgent for human health. It is critical to promote the cheap technologies for water purification to guarantee the free-pathogens-drinking water. The present study has been investigated the antibacterial activity of polyacrylonitrile (PAN) nanofibers membranes which decorated by Ag, CuO or ZnO nanoparticles as bactericides. The hybrid nanofiber composites were fabricated by electrospinning technique and the obtained membranes were characterized using SEM, EDX and FTIR. Their antibacterial activity was evaluated against E...
July 11, 2018: Ecotoxicology and Environmental Safety
Ibrahim Mohamed, Maha Ali, Nevin Ahmed, Mohamed H H Abbas, Mohamed Abdelsalam, Ahmed Azab, David Raleve, Chen Fang
The current study aims to investigate the implications of amending a soil contaminated with Cd with peanut residues biochar (BP) solely or in combination with cow manure (CMPB) at different rates on phytotoxicity of Cd for wheat plants and its distribution in a mine contaminated soil. Soil pH and EC increased progressively in soils amended with either PB or CMPB. Exchangeable Cd was decreased while its non-exchangeable fractions were increased. Dry weights of wheat straw, roots and grains increased when soils amended with either PB or CMPB, especially at the higher application rate...
July 10, 2018: Ecotoxicology and Environmental Safety
Lin Wang, Ruonan Ma, Yue Yin, Zhen Jiao
Carbon ion beams irradiation as an important type of ionizing radiation is one of the major approaches used to create mutants in plants. This study investigated the role of carbon ion beams irradiation in mitigating cold stress in Arabidopsis thaliana seedlings. The results showed that 50-Gy carbon ion beam irradiation appeared stimulatory effects on root length and fresh weight in Arabidopsis seedlings under cold stress. In comparison with control, the content of hydrogen peroxide, the production rate of superoxide anion radical, hydroxyl radical generation activity, and malondialdehyde content were obviously decreased in 50-Gy carbon ion beam irradiated seedlings in response to cold stress...
July 10, 2018: Ecotoxicology and Environmental Safety
Anthony P Howells, Steven J Lewis, Dylan B Beard, Ian W Oliver
Drinking water treatment residuals (WTRs), the by-product of water clarification processes, are routinely disposed of via landfill however there is a growing body of research that demonstrates the material has great potential for beneficial use in environmental applications. Application to agricultural land is one option showing great promise (i.e. a low cost disposal route that provides organic matter input to soils and other potential benefits), however questions remain as to the impact such applications may have on earthworm survival and behaviour and also on the potential effects it may have on soil porewater chemistry...
July 10, 2018: Ecotoxicology and Environmental Safety
V C Shruti, P F Rodríguez-Espinosa, E Martinez-Tavera, D Hernández-Gonzalez
The present study addresses the metal concentration pattern and associated human health risks in ash samples of Popocatepetl volcano. In this regard, 12 ash samples from different regions of Puebla City were collected and analyzed for 28 major and trace metals, out of which exclusively 8 metals of potential risk (Cd, Co, Cr, Cu, Mn, Ni, Pb & Zn) were selected for human health risk validation. The metal concentration pattern showed an enriching trend for ferromagnesium and carbonate elements compared to previous ash eruptions...
July 9, 2018: Ecotoxicology and Environmental Safety
Juan Chen, Yu-Qing Liu, Xiao-Wu Yan, Ge-Hong Wei, Jian-Hua Zhang, Lin-Chuan Fang
Despite numerous reports that legume-rhizobium symbiosis alleviates Cu stress in plants, the possible roles of legume-rhizobium symbiosis and the regulatory mechanisms in counteracting Cu toxicity remain unclear. Here, Sinorhizobium meliloti CCNWSX0020 was used for analyzing the effects of rhizobium inoculation on plant growth in Medicago sativa seedlings under Cu stress. Our results showed that rhizobium inoculation alleviated Cu-induced growth inhibition, and increased nitrogen concentration in M. sativa seedlings...
July 9, 2018: Ecotoxicology and Environmental Safety
Ya-Qian Xu, Shu-Shen Liu, Ze-Jun Wang, Kai Li, Rui Qu
The biological effects related to personal care products (PCPs) are almost induced by some active ingredients in the PCPs rather than the PCP itself. In this study, 23 common and widely used toner, skin water, and make-up water (TSM) commodities were directly taken as mixture samples, and Vibrio qinghaiensis sp.-Q67 (Q67) was used as the test organism. The toxicities of the TSMs to Q67 were determined via microplate toxicity analysis at 0.25 h and 12 h. Each TSM commodity can be regarded as a complicated mixture (relative concentration is 1)...
July 9, 2018: Ecotoxicology and Environmental Safety
Gang Wang, Yan Wang, Li Liu, Yan Jin, Ning Zhu, Xing Li, Guoqing Wang, Guowei Chen
Understanding microbial aggregation dynamics in response to the often violent environmental fluctuations is important for activated sludge wastewater biotreatment practice, yet remains poorly understood. We investigated microbial aggregation process of an activated sludge reactor in response to various operating conditions of resource limitations, disinfectant and pH stresses, and quantified aggregation characteristics by employing a fuzzy clustering analysis (FCA) method. The results revealed that the FCA provided a means for comprehensive assessment of microbial aggregation dynamics of the bioreactor relying solely on simple parameter estimation...
July 9, 2018: Ecotoxicology and Environmental Safety
Paula Fanny Cossi, Lucila Thomsett Herbert, María Soledad Yusseppone, Analía Fernanda Pérez, Gisela Kristoff
Organophosphate insecticides (OPs) are commonly used in Argentina and around the world for pest control in food crops. They exert their toxicity through the inhibition of the enzyme acetylcholinesterase. In the present study, we aimed to evaluate biochemical and reproductive effects in Biomphalaria straminea, a freshwater gastropod naturally distributed in Argentina, of subchronic exposures to environmental azinphos-methyl concentrations (20 and 200 µg L-1 ). For biochemical parameters, adult organisms were exposed for 14 days and the activity of cholinesterases (ChEs), carboxylesterases (CEs), glutathione S-transferase (GST), catalase (CAT), superoxide dismutase (SOD), the production of reactive oxygen species (ROS), the total antioxidant capacity (TAC), glycogen and proteins were determined...
July 9, 2018: Ecotoxicology and Environmental Safety
Jakub Trawiński, Robert Skibiński
The photolytic and photocatalytic transformation of an antipsychotic drug asenapine with the use of H2 O2 and TiO2 was studied. A method employing irradiation with a simulated full solar spectrum in the photostability chamber was applied, then the reverse-phase ultra high performance liquid chromatography with diode array detector, coupled with electrospray quadrupole time-of-flight mass spectrometer (RP-UHPLC-DAD - ESI-Q-TOF) was used for the quantitative and qualitative analysis of the processes. The developed quantitative method was fully validated, according to the International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH) guidelines, and the kinetic parameters of asenapine photodecomposition were compared...
July 7, 2018: Ecotoxicology and Environmental Safety
Mostafa R Abukhadra, Mohamed Shaban, Mariam A Abd El Samad
Natural zeolite heulandite/polyaniline composite (Hu/PANI) was synthesized for the first time as catalyst support for nickel oxide photocatalyst (Hu/PANI@Ni2 O3 ). The structural, chemical, morphological, textural and optical properties were investigated using different techniques. The synthetic Ni2 O3 crystals showed well developed flaky habits with diameter range 200-400 nm and length range 1-4 µm. The estimated band gap energies of Hu/PANI composite and Hu/PANI@Ni2 O3 composite are 1.8 eV and 1.46 eV, respectively, which are remarkably smaller than the recorded value for pure nickel oxide...
July 7, 2018: Ecotoxicology and Environmental Safety
Ying Zhu, Yuzhong Niu, Hanyu Li, Bing Ren, Rongjun Qu, Hou Chen, Ying Zhang
A series of silica gel supported amino-terminated PAMAM dendrimers (SG-G1.0 - SG-G3.0) were used for the removal of Cd(II) and Fe(III) from dimethylsulfoxide (DMSO). Various parameters that influence adsorption behaviors including temperature, contact time, and initial metal ion concentration were studied. The adsorption mechanism was revealed by combining the results of experiment and density functional theory (DFT) calculation. It indicates that the adsorption capacities for Cd(II) and Fe(III) are largest among the metal ions tested...
July 6, 2018: Ecotoxicology and Environmental Safety
Servet Tural, Mehmet Şakir Ece, Bilsen Tural
Click chemistry refers to a group of reactions that are fast, simple to use, easy to purify, versatile, regiospecific, and give high product yields. Therefore, a novel, efficient magnetic nano-sorbent based on N-methyl-D-glucamine attached to magnetic nanoparticles was prepared using click coupling method. Its boron sorption capacity was compared with N-methyl-D-glucamine direct attached nano-sorbent. The characterization of the magnetic sorbents was investigated by several techniques such as X-ray diffraction, scanning electron microscope, transmission electron microscope, dynamic light scattering, thermogravimetric analysis, Fourier transform infrared spectrophotometer, and vibrating sample magnetometer...
July 6, 2018: Ecotoxicology and Environmental Safety
Ashraf Awad, Samah R Khalil, Mayada Ragab Farag, Mohamed Abdo Nassan
In this study, we aimed to assess the differential toxic impact, induced by furan exposure, on the liver and kidney tissues by estimating reactive oxygen species (ROS) level, total antioxidant capacity (TAC), oxidative damage, and the tissue injury markers in a male rat model. To explain such impacts, 20 rats were assigned into two groups: a control group, where rats were administered corn oil as a vehicle, and a furan-administered group, where furan was orally administered to rats at a dose of 16 mg/kg b wt/day (five days per week over eight weeks)...
July 6, 2018: Ecotoxicology and Environmental Safety
Zhu Ming, Shicheng Feng, Ailimire Yilihamu, Shengnan Yang, Qiang Ma, Hua Yang, Yitong Bai, Sheng-Tao Yang
Carbon nanotubes (CNTs) are widely used in diverse areas with increasing annual production, thus the environmental impact of CNTs needs thorough investigation. In this study, we evaluated the effect of pristine multi-walled CNTs (p-MWCNTs) and oxidized multi-walled CNTs (o-MWCNTs) on white rot fungus Phanerochaete chrysosporium, which is the decomposer in carbon cycle and also has many applications in environmental remediation. Both p-MWCNTs and o-MWCNTs had no influence on the dry weight increase of P. chrysosporium and the pH value of culture system...
July 6, 2018: Ecotoxicology and Environmental Safety
Yi-Ping Chen, Qiang Liu, Qing-Yi Ma, Lorraine Maltby, Aaron M Ellison, Yan Zhao
Captive pandas are exposed to higher concentrations of environmental toxins in their food source and from atmospheric pollution than wild pandas. Moreover, the Qinling panda subspecies had significantly higher concentrations of toxic chemicals in its feces. To determine whether these toxicants also accumulate in panda's blood and impair its health, concentrations of persistent organic pollutants (POPs) and heavy metals were measured in blood samples. Four heavy metals (As, Cd, Cr and Pb), PCDD/Fs and PCBs were detected in blood drawn from captive Qinling pandas...
July 6, 2018: Ecotoxicology and Environmental Safety
Guodong Cai, Kai Sun, Tao Wang, Hui Zou, Jianhong Gu, Yan Yuan, Xuezhong Liu, Zongping Liu, Jianchun Bian
Zearalenone (ZEA) is particularly toxic to the female reproductive system. Nevertheless, the effect of ZEA on the immune system is still not fully understood. The following study investigates the effects and mechanism of ZEA on mouse T cell activation in vitro. Briefly, T lymphocytes were extracted from primary splenic lymphocyte in mice, activated by concanavalin A, and then were exposed to different concentrations of ZEA for a certain period of time. Flow cytometry was used to detect the expression of activating and co-stimulatory molecules, and the secretion of cytokines in T cells at various stages...
July 6, 2018: Ecotoxicology and Environmental Safety
Fernanda Moreira Lopes, Juliana Zomer Sandrini, Marta Marques Souza
Glyphosate is the active component of many commonly used herbicides; it can reach bodies of water through irrigated rice plantations. In the present study, we evaluated the effect of glyphosate and Roundup® (a glyphosate-based herbicide) in established culture of the zebrafish hepatocyte cell line ZF-L after 24 and 48 h of exposure to concentrations of 650 and 3250 µg/L. We observed a reduction in metabolic activity and lysosomal integrity, and an increase in cell number after 24 h of Roundup® exposure at the highest concentration...
July 5, 2018: Ecotoxicology and Environmental Safety
Susana Loureiro, Sandra Filipe Gonçalves, Gil Gonçalves, Maria Jesús Hortiguela, Sandra Rebelo, Marta Carmona Ferro, Mercedes Vila
Nanographene oxide (nGO) has been recently proposed as a new antitumoral therapeutic agent, drug delivery carrier and gene transfection vehicle, among others. Treatment is carried out by hyperthermia induced by infrared irradiation. After treatment, the nanosystems will be inevitably excreted and released to the environment. To understand the potential impacts of pegylated nGO (nGO-PEG), three key species from different trophic levels were used: the green micro-algae Raphidocelis subcapitata (growth inhibition test), the cladocera Daphnia magna (acute and chronic tests), and the fish Danio rerio (fish embryo test)...
July 5, 2018: Ecotoxicology and Environmental Safety
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