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https://www.readbyqxmd.com/read/28646780/sem-eds-and-optical-microscopy-analyses-of-microplastics-in-ocean-trawl-and-fish-guts
#1
Zhong-Min Wang, Jeff Wagner, Sutapa Ghosal, Gagandeep Bedi, Stephen Wall
Microplastic particles from Atlantic and Pacific Ocean trawls, lab-fed fish guts and ocean fish guts have been characterized using optical microscopy and SEM/EDS in terms of size, morphology, and chemistry. We assessed whether these measurements could serve as a rapid screening process for subsequent identification of the likely microplastic candidates by micro-spectroscopy. Optical microscopy enabled morphological classification of the types of particles or fibers present in the sample, as well as the quantification of particle size ranges and fiber lengths...
June 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28646775/consequences-of-intensive-forest-harvesting-on-the-recovery-of-swedish-lakes-from-acidification-and-on-critical-load-exceedances
#2
Filip Moldan, Johanna Stadmark, Jens Fölster, Sara Jutterström, Martyn N Futter, Bernard J Cosby, Richard F Wright
Across much of the northern hemisphere, lakes are at risk of re-acidification due to incomplete recovery from historical acidification and pressures associated with more intensive forest biomass harvesting. Critical load (CL) calculations aimed at estimating the amount of pollutants an ecosystem can receive without suffering adverse consequences are dependent on these factors. Here, we present a modelling study of the potential effects of intensified forest harvesting on re-acidification of a set of 3239 Swedish lakes based on scenarios with varying intensities of forest biomass harvest and acid deposition...
June 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28646767/enhanced-photodegradation-of-2-4-dichlorophenoxyacetic-acid-using-a-novel-tio2-mgfe2o4-core-shell-structure
#3
Bui The Huy, Da-Som Jung, Nguyen Thi Kim Phuong, Yong-Ill Lee
A novel TiO2@MgO-Fe2O3 core-shell structure has been synthesized via a hydrolysis and co-precipitation method followed by calcination at 500 °C and has proven to be an efficient photocatalyst. The obtained TiO2@MgO-Fe2O3 core-shell was characterized by scanning electron microscopy, X-ray diffraction, and UV-Vis diffused reflectance techniques. Its photocatalytic activity toward 2,4-dichlorophenoxyacetic acid (2,4-D) was investigated in aqueous solutions with and without visible light irradiation in the presence and absence of hydrogen peroxide...
June 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28646766/gaps-in-aquatic-toxicological-studies-of-microplastics
#4
REVIEW
Ali Karami
The contamination of aquatic environments with microplastics (MPs) has spurred an unprecedented interest among scientific communities to investigate their impacts on biota. Despite the rapid growth in the number of studies on the aquatic toxicology of MPs, controversy over the fate and biological impacts of MPs is increasingly growing mainly due to the absence of standardized laboratory bioassays. Given the complex features of MPs, such as the diversity of constituent polymers, additives, shapes and sizes, as well as continuous changes in the particle buoyancy as a result of fouling and defouling processes, it is necessary to modify conventional bioassay protocols before employing them for MP toxicity testings...
June 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28646765/historical-record-of-polychlorinated-biphenyls-pcbs-and-special-occurrence-of-pcb-209-in-a-shallow-fresh-water-lake-from-eastern-china
#5
Shouliang Huo, Chaocan Li, Beidou Xi, Zhiqiang Yu, Kevin M Yeager, Fengchang Wu
Concentrations of polychlorinated biphenyls (PCBs) were measured in dated sediment cores collected from the fifth largest freshwater lake in China, Lake Chaohu, to investigate PCB temporal trends, accumulation, and environmental fate. Total PCB concentrations in Lake Choahu sediments ranged from 0.03 to 24.11 ng g(-1) (d.w.). PCB 209 was the dominant congener, accounting for 45.5%-83.9% of total PCBs detected after the mid-20th century. All PCB congeners were positively correlated with total organic carbon (TOC) concentrations...
June 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28646749/mutually-facilitated-co-transport-of-two-different-viruses-through-reactive-porous-media
#6
Shuang Xu, Ramesh Attinti, Elizabeth Adams, Jie Wei, Kalmia Kniel, Jie Zhuang, Yan Jin
In this study, we quantified transport and retention behaviors of a human pathogenic virus (Adenovirus 41, abbreviated as Ad-41) and a model bacteriophage (ϕX174) through metal oxide-removed and goethite-coated sand under saturated flow conditions. Two sets of bench scale column experiments were conducted: transport of each type of viruses alone and co-transport of both viruses. All experiments were conducted at pH 7.5 using 2 mM artificial ground water (AGW) buffer as background solution. Experimental results revealed that goethite-coated sand (i...
June 18, 2017: Water Research
https://www.readbyqxmd.com/read/28646720/nanoporous-gold-based-microbial-biosensor-for-direct-determination-of-sulfide
#7
Zhuang Liu, Hanyue Ma, Huihui Sun, Rui Gao, Honglei Liu, Xia Wang, Ping Xu, Luying Xun
Environmental pollution caused by sulfide compounds has become a major problem for public health. Hence, there is an urgent need to explore a sensitive, selective, and simple sulfide detection method for environmental monitoring and protection. Here, a novel microbial biosensor was developed using recombinant Escherichia coli BL21 (E. coli BL21) expressing sulfide:quinone oxidoreductase (SQR) for sulfide detection. As an important enzyme involved in the initial step of sulfide metabolism, SQR oxidizes sulfides to polysulfides and transfers electrons to the electron transport chain...
June 20, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28646525/preliminary-characterization-of-putative-structural-cuticular-proteins-in-the-malaria-vector-anopheles-sinensis
#8
Dan Zhou, Baiyun Duan, Yan Sun, Lei Ma, Changliang Zhu, Bo Shen
BACKGROUND: The insect cuticle protects against environmental stresses such as insecticides, physical injury, dehydration and pathogenic microorganisms. Structural cuticular proteins (CPs) are the primary components, and are of interest for physiology-based pest management methods. Anopheles sinensis CPs are poorly characterised at present, therefore we performed whole genome sequence analysis and re-analysed available transcriptome data to identify potential insecticide resistance-associated CPs...
June 23, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28646477/a-double-quadratic-model-for-predicting-vibrio-species-in-water-environments-of-japan
#9
Hidemasa Izumiya, Masato Furukawa, Kikuyo Ogata, Junko Isobe, Setsu Watanabe, Mari Sasaki, Kazuya Ichinose, Eiji Arakawa, Masatomo Morita, Ichiro Kurane, Makoto Ohnishi
Vibrio spp. are natural inhabitants of marine and estuarine environments. Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio vulnificus are the major infectious agents for humans. Their densities are affected by environmental factors such as water temperature and salinity. The detailed contribution of each factor still remains to be elucidated. Here we conducted multi-coastal study in a 21-month period to examine relationships between environmental factors and V. cholerae, V. parahaemolyticus and V. vulnificus densities in sea surface water in eight coastal sites of four prefectures in Japan...
June 23, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28646455/human-nucleus-pulposus-intervertebral-disc-cells-becoming-senescent-using-different-treatments-exhibit-a-similar-transcriptional-profile-of-catabolic-and-inflammatory-genes
#10
Sotiris-Spyros Vamvakas, Eleni Mavrogonatou, Dimitris Kletsas
PURPOSE: Chronic low back pain has been associated with intervertebral disc (IVD) degeneration, which is characterized by the accumulation of extracellular matrix (ECM)-degrading proteases and inflammatory molecules in the degenerate tissue. IVD degeneration could be the outcome of natural organismal ageing and/or of the exposure of the disc to cumulative stressful environmental stimuli and is accompanied by an increased population of senescent cells in the tissue. On the other hand, senescent cells are known to secrete proteolytic enzymes and inflammatory molecules, which can contribute to ECM catabolism...
June 23, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28646449/occurrence-of-pepper-mild-mottle-virus-pmmov-in-groundwater-from-a-karst-aquifer-system-in-the-yucatan-peninsula-mexico
#11
Gabriela Rosiles-González, Gerardo Ávila-Torres, Oscar A Moreno-Valenzuela, Gilberto Acosta-González, Rosa María Leal-Bautista, Cinthya D Grimaldo-Hernández, Judith K Brown, Cristóbal Chaidez-Quiroz, Walter Q Betancourt, Charles P Gerba, Cecilia Hernández-Zepeda
The Yucatan Peninsula of Mexico hosts a karst aquifer system that is the only source of freshwater for the area; however, it is vulnerable to human-mediated contamination. Pepper mild mottle virus (PMMoV) is one of the most abundant RNA viruses associated with human feces, making it a viable indicator for tracking fecal pollution in aquatic environments, including groundwater. In this study, groundwater samples collected from a karst aquifer from fresh and brackish water locations were analyzed for fecal indicator bacteria, somatic and male F+ specific coliphages, and PMMoV during the rainy and dry seasons...
June 23, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/28646437/cytotoxic-and-genotoxic-effects-of-silver-nanoparticle-carboxymethyl-cellulose-on-allium-cepa
#12
Aline A Becaro, Maria Célia Siqueira, Fernanda C Puti, Marcia Regina de Moura, Daniel S Correa, José Manoel Marconcini, Luiz H C Mattoso, Marcos David Ferreira
Several mutagenic agents may be present in substances released in the environment, which may cause serious environmental impacts. Among these substances, there is a special concern regarding the widespread use of silver nanoparticles (AgNP) in several products due to their widely known bactericidal properties, including in the medical field and the food industry (e.g., active packaging). The assessment of the effects of AgNP released in the environment, having different concentrations, sizes, and being associated or not to other types of materials, including polymers, is therefore essential...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28646397/concentrations-of-environmental-chemicals-in-urine-and-blood-samples-of-children-from-san-luis-potos%C3%A3-mexico
#13
Ivan N Perez-Maldonado, Angeles C Ochoa-Martinez, Sandra T Orta-Garcia, Tania Ruiz-Vera, Jose A Varela-Silva
Human biomonitoring (HBM) is an appreciated tool used to evaluate human exposure to environmental, occupational or lifestyle chemicals. Therefore, the aim of this study was to evaluate the exposure levels for environmental chemicals in urine and blood samples of children from San Luis Potosí, Mexico (SLP). This study identifies environmental chemicals of concern such as: arsenic (45.0 ± 15.0 µg/g creatinine), lead (5.40 ± 2.80 µg/dL), t,t-muconic acid (266 ± 220 µg/g creatinine), 1-hydroxypyrene (0...
June 23, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28646396/enhanced-phytoextraction-of-lead-from-artificially-contaminated-soil-by-mirabilis-jalapa-with-chelating-agents
#14
Li Yan, Cuilan Li, Jinjing Zhang, Odeshnee Moodley, Shuoran Liu, Chang Lan, Qiang Gao, Wenjing Zhang
A microcosm experiment was conducted to compare how different chelating agents enhance the phytoextraction of lead (Pb) by Mirabilis jalapa from an artificially Pb-contaminated soil. Chelating agents used included ethylene diamine tetraacetic acid (EDTA), nitrilotriacetic acid (NTA), ethylene diamine disuccinic acid (EDDS), oxalic acid, humic acid, citric acid and tartaric acid, with concentrations ranging from 0 to 2000 mg/kg. Results show that with increasing concentrations of chelating agents, the concentrations, bioaccumulation coefficients, and translocation factors of Pb in M...
June 23, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28646352/lead-enhancement-of-3t3-l1-fibroblasts-differentiation-to-adipocytes-involves-erk-c-ebp%C3%AE-and-ppar%C3%AE-activation
#15
Claudia Noemí Martini, Matías Gabrielli, Graciela Bonifacino, María Magdalena Codesido, María Del Carmen Vila
Lead (Pb) is an environmental and industrial contaminant that still represents a public health problem. Elevated Pb exposure has been inversely correlated with femoral bone density and associated with osteoporosis. In the last years, it has been shown that inhibition of osteogenesis from mesenchymal stem cells activates adipogenesis and vice versa. In this paper, we investigated the effect of Pb on the differentiation of 3T3-L1 fibroblasts to adipocytes which is the cell model most used to study adipogenesis...
June 23, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28646337/-epidemiology-of-refractive-errors
#16
C Wolfram
Refractive errors are very common and can lead to severe pathological changes in the eye. This article analyzes the epidemiology of refractive errors in the general population in Germany and worldwide and describes common definitions for refractive errors and clinical characteristics for pathologicaal changes. Refractive errors differ between age groups due to refractive changes during the life time and also due to generation-specific factors. Current research about the etiology of refractive errors has strengthened the influence of environmental factors, which led to new strategies for the prevention of refractive pathologies...
June 23, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/28646299/effective-combined-water-and-sideband-suppression-for-low-speed-tissue-and-in-vivo-mas-nmr
#17
Yalda Liaghati Mobarhan, Jochem Struppe, Blythe Fortier-McGill, André J Simpson
High-resolution magic angle spinning (HR-MAS) NMR is a powerful technique that can provide metabolic profiles and structural constraints on intact biological and environmental samples such as cells, tissues and living organisms. However, centripetal force from fast spinning can lead to a loss of sample integrity. In analyses focusing on structural organization, metabolite compartmentalization or in vivo studies, it is critical to keep the sample intact. As such, there is growing interest in slow spinning studies that preserve sample longevity...
June 23, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28646233/identifying-community-thresholds-for-lotic-benthic-diatoms-in-response-to-human-disturbance
#18
Tao Tang, Ting Tang, Lu Tan, Yuan Gu, Wanxiang Jiang, Qinghua Cai
Although human disturbance indirectly influences lotic assemblages through modifying physical and chemical conditions, identifying thresholds of human disturbance would provide direct evidence for preventing anthropogenic degradation of biological conditions. In the present study, we used data obtained from tributaries of the Three Gorges Reservoir in China to detect effects of human disturbance on streams and to identify disturbance thresholds for benthic diatoms. Diatom species composition was significantly affected by three in-stream stressors including TP, TN and pH...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28646231/inter-annual-variability-of-transparent-exopolymer-particles-in-the-arctic-ocean-reveals-high-sensitivity-to-ecosystem-changes
#19
Anja Engel, Judith Piontek, Katja Metfies, Sonja Endres, Pim Sprong, Ilka Peeken, Steffi Gäbler-Schwarz, Eva-Maria Nöthig
Transparent exopolymer particles (TEP) are a class of marine gel particles and important links between surface ocean biology and atmospheric processes. Derived from marine microorganisms, these particles can facilitate the biological pumping of carbon dioxide to the deep sea, or act as cloud condensation and ice nucleation particles in the atmosphere. Yet, environmental controls on TEP abundance in the ocean are poorly known. Here, we investigated some of these controls during the first multiyear time-series on TEP abundance for the Fram Strait, the Atlantic gateway to the Central Arctic Ocean...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28646198/spatiotemporal-dynamics-of-grassland-aboveground-biomass-on-the-qinghai-tibet-plateau-based-on-validated-modis-ndvi
#20
Shiliang Liu, Fangyan Cheng, Shikui Dong, Haidi Zhao, Xiaoyun Hou, Xue Wu
Spatiotemporal dynamics of aboveground biomass (AGB) is a fundamental problem for grassland environmental management on the Qinghai-Tibet Plateau (QTP). Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data can feasibly be used to estimate AGB at large scales, and their precise validation is necessary to utilize them effectively. In our study, the clip-harvest method was used at 64 plots in QTP grasslands to obtain actual AGB values, and a handheld hyperspectral spectrometer was used to calculate field-measured NDVI to validate MODIS NDVI...
June 23, 2017: Scientific Reports
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