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https://www.readbyqxmd.com/read/29930891/significance-thresholds-for-the-assessment-of-contaminated-groundwater-perfluorinated-and-polyfluorinated-chemicals
#1
REVIEW
Karl Theo von der Trenck, Rainer Konietzka, Annegret Biegel-Engler, Jan Brodsky, Andrea Hädicke, Arnold Quadflieg, Rudolf Stockerl, Thorsten Stahl
Background: Per- and polyfluorinated chemicals (PFC) do not occur naturally in the environment and are, therefore, of anthropogenic origin. As a consequence of their wide range of everyday applications and their extreme persistence in the environment, PFC have become ubiquitous in nature and can, therefore, be detected in groundwater as well as in many other environmental matrices. The German States' Water and Soil Consortia have compiled 'significance thresholds' (GFS) to assess groundwater contaminated with PFC...
2018: Environmental Sciences Europe
https://www.readbyqxmd.com/read/29929319/contaminated-land-and-wetland-remediation-in-nigeria-opportunities-for-sustainable-livelihood-creation
#2
K Sam, N Zabbey
The Niger Delta region of Nigeria is one of the most crude oil impacted deltas globally. The region has experienced over five decades of oil related contamination of the total environment (air, soil, water and biota). In 2011, UNEP released a seminal report on oil impact on Ogoniland environments, which up scaled demands for urgent clean up and restoration of degraded bio-resource rich environments of the Niger Delta, starting from Ogoniland. The Nigerian Government demonstrated renewed political will to remediate contaminated sites in Ogoniland with a launch of the clean-up exercise in June 2016...
October 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29928012/quantification-of-bacterial-fluorescence-using-independent-calibrants
#3
Jacob Beal, Traci Haddock-Angelli, Geoff Baldwin, Markus Gershater, Ari Dwijayanti, Marko Storch, Kim de Mora, Meagan Lizarazo, Randy Rettberg
Fluorescent reporters are commonly used to quantify activities or properties of both natural and engineered cells. Fluorescence is still typically reported only in arbitrary or normalized units, however, rather than in units defined using an independent calibrant, which is problematic for scientific reproducibility and even more so when it comes to effective engineering. In this paper, we report an interlaboratory study showing that simple, low-cost unit calibration protocols can remedy this situation, producing comparable units and dramatic improvements in precision over both arbitrary and normalized units...
2018: PloS One
https://www.readbyqxmd.com/read/29926191/occurrence-and-levels-of-potentially-harmful-elements-phes-in-natural-waters-of-the-gold-mining-areas-of-the-kette-batouri-region-of-eastern-cameroon
#4
M A Jordaan, M E Mimba, S C NguemheFils, B T Edith-Etakah, M Shapi, J Penaye, T C Davies
This study was designed to determine the extent to which alluvial and bedrock gold mining activities in the Kette-Batouri region of Eastern Cameroon are responsible for the discharge of potentially harmful elements (PHEs) into natural water bodies. This is considered to be of great public concern, since elevated levels of PHEs in these water bodies, which are widely used for domestic purposes, could have adverse health and environmental effects on the population and nearby ecosystems. The investigation into the levels of PHEs in natural water bodies of this area was conducted to ascertain the toxicity posed by mine waste stockpiles as data from the literature on this subject are scarce...
June 21, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29925057/pollution-characteristics-and-health-risk-assessment-of-heavy-metals-in-the-vegetable-bases-of-northwest-china
#5
Rukeya Sawut, Nijat Kasim, Balati Maihemuti, Li Hu, Abdugheni Abliz, Abdusalam Abdujappar, Miradil Kurban
The objective of this study was to investigate heavy metal contamination in four major vegetable bases and determine the health risks of residents in the vicinity of the highly urbanized city Urumqi in Xinjiang, China. In this paper, we determined the contents of six heavy metals (i.e., As, Zn, Cd, Cr, Hg, and Pb) in surface soil and groundwater to evaluate the levels of heavy metal pollution and human health risks using the pollution index (PI), the Nemerow integrated pollution index (NIPI), the ecological risk factor (Ei r ), risk index (RI) and the health risk assessment model...
June 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29916149/arsenic-contamination-subsequent-water-toxicity-and-associated-public-health-risks-in-the-lower-indus-plain-sindh-province-pakistan
#6
Asfandyar Shahab, Shihua Qi, Muhammad Zaheer
Arsenic (As) contamination in drinking water is a global public health risk. The present study highlighted the geological and anthropogenic causes of As contamination in groundwater (GW) and surface water (SW) and assessment of their potential health risks in Sindh province of Pakistan. Upon analyzing 720 GW and SW samples from 18 different sites, the estimates of As in groundwater and surface water was observed in the range of 0 to 125 and 0 to 35 μg/L with mean values of 46.8 and 15.43 μg/L respectively...
June 18, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29915687/what-killed-frame-lake-a-precautionary-tale-for-urban-planners
#7
Melody J Gavel, R Timothy Patterson, Nawaf A Nasser, Jennifer M Galloway, Bruce W Hanna, Peter A Cott, Helen M Roe, Hendrik Falck
Frame Lake, located within the city of Yellowknife, Northwest Territories, Canada, has been identified as requiring significant remediation due to its steadily declining water quality and inability to support fish by the 1970s. Former gold mining operations and urbanization around the lake have been suspected as probable causes for the decline in water quality. While these land-use activities are well documented, little information is available regarding their impact on the lake itself. For this reason, Arcellinida, a group of shelled protozoans known to be reliable bioindicators of land-use change, were used to develop a hydroecological history of the lake...
2018: PeerJ
https://www.readbyqxmd.com/read/29915565/understanding-and-designing-the-strategies-for-the-microbe-mediated-remediation-of-environmental-contaminants-using-omics-approaches
#8
REVIEW
Muneer A Malla, Anamika Dubey, Shweta Yadav, Ashwani Kumar, Abeer Hashem, Elsayed Fathi Abd Allah
Rapid industrialization and population explosion has resulted in the generation and dumping of various contaminants into the environment. These harmful compounds deteriorate the human health as well as the surrounding environments. Current research aims to harness and enhance the natural ability of different microbes to metabolize these toxic compounds. Microbial-mediated bioremediation offers great potential to reinstate the contaminated environments in an ecologically acceptable approach. However, the lack of the knowledge regarding the factors controlling and regulating the growth, metabolism, and dynamics of diverse microbial communities in the contaminated environments often limits its execution...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29913620/bioavailability-of-weathered-hydrocarbons-in-engine-oil-contaminated-soil-impact-of-bioaugmentation-mediated-by-pseudomonas-spp-on-bioremediation
#9
Kavitha Ramadass, Mallavarapu Megharaj, Kadiyala Venkateswarlu, Ravi Naidu
Heavier fraction hydrocarbons (C15 -C36 ) formed in soil after biotic and abiotic weatherings of engine oil are the continuing constraints in the bioremediation strategy, and their bioavailability remains a poorly quantified regulatory factor. In a microcosm study, we used two strains of Pseudomonas, P. putida TPHK-1 and P. aeruginosa TPHK-4, in strategies of bioremediation, viz., natural attenuation, biostimulation and bioaugmentation, for removal of weathered total petroleum hydrocarbons (TPHs) in soil contaminated long-term with high concentrations of engine oil (39,000-41,000 mg TPHs kg-1 soil)...
September 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29913373/comparison-of-aerobic-atrazine-degradation-with-zero-valent-aluminum-and-zero-valent-iron
#10
Wenjuan Shen, Hongliang Kang, Zhihui Ai
This study systematically compared the degradation of atrazine (ATR) with aerobic zero-valent aluminum (ZVAl/Air) and zero-valent iron (ZVI/Air) systems. By comparing the ATR degradation curves and rate in the ZVAl/Air and the ZVI/Air systems, a significant induction period was observed in the ZVAl/Air system, and the pseudo-first-order rate constant of ATR degradation in the second stage by ZVAl was 6.4 times faster than that by ZVI. The differences in ATR degradation patterns of the two systems stemmed from the different redox nature and electrical conductivity of aluminum (oxide) and iron (oxide)...
June 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29908571/aromatherapy-botanicals-and-essential-oils-in-acne
#11
Warren J Winkelman
Complementary and alternative medicine approaches are popular among some patient segments due to the perception that they are "natural" and thus are believed to be less likely to be dangerous, to be less toxic, or to cause fewer side effects. In dermatology, these can include aromatherapy, botanicals, and essential oils (plant extracts). Preliminary evidence, biological activity studies, and small pilot clinical trials conducted outside of North America, mostly in young adults, suggest that some may have value in acne treatment...
May 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29908502/a-method-for-separation-of-heavy-metal-sources-in-urban-groundwater-using-multiple-lines-of-evidence
#12
Emily Hepburn, Anne Northway, Dawit Bekele, Gang-Jun Liu, Matthew Currell
Determining sources of heavy metals in soils, sediments and groundwater is important for understanding their fate and transport and mitigating human and environmental exposures. Artificially imported fill, natural sediments and groundwater from 240 ha of reclaimed land at Fishermans Bend in Australia, were analysed for heavy metals and other parameters to determine the relative contributions from different possible sources. Fishermans Bend is Australia's largest urban re-development project, however, complicated land-use history, geology, and multiple contamination sources pose challenges to successful re-development...
June 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29908396/potential-for-u-sequestration-with-select-minerals-and-sediments-via-base-treatment
#13
Hilary P Emerson, Silvina Di Pietro, Yelena Katsenovich, Jim Szecsody
Temporary base treatment is a potential remediation technique for heavy metals through adsorption, precipitation, and co-precipitation with minerals. Manipulation of pH with ammonia gas injection may be especially useful for vadose zone environments as it does not require addition of liquids that would increase the flux towards groundwater. In this research, we conducted laboratory batch experiments to evaluate the changes in uranium mobility and mineral dissolution with base treatments including sodium hydroxide, ammonium hydroxide, and ammonia gas...
June 13, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29906966/resumption-of-dynamism-in-damaged-networks-of-coupled-oscillators
#14
Srilena Kundu, Soumen Majhi, Dibakar Ghosh
Deterioration in dynamical activities may come up naturally or due to environmental influences in a massive portion of biological and physical systems. Such dynamical degradation may have outright effect on the substantive network performance. This requires us to provide some proper prescriptions to overcome undesired circumstances. In this paper, we present a scheme based on external feedback that can efficiently revive dynamism in damaged networks of active and inactive oscillators and thus enhance the network survivability...
May 2018: Physical Review. E
https://www.readbyqxmd.com/read/29900489/titania-nanotubes-prepared-by-rapid-breakdown-anodization-for-photocatalytic-decolorization-of-organic-dyes-under-uv-and-natural-solar-light
#15
Saima Ali, Henrika Granbohm, Jouko Lahtinen, Simo-Pekka Hannula
Titania nanotube (TNT) powder was prepared by rapid breakdown anodization (RBA) in a perchloric acid electrolyte. The photocatalytic efficiency of the as-prepared and powders annealed at temperatures between 250 and 550 °C was tested under UV and natural sunlight irradiation by decolorization of both anionic and cationic organic dyes, i.e., methyl orange (MO) and rhodamine B (RhB), as model pollutants. The tubular structure of the nanotubes was retained up to 250 °C, while at 350 °C and above, the nanotubes transformed into nanorods and nanoparticles...
June 14, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29896568/metagenomics-reveals-the-influence-of-land-use-and-rain-on-the-benthic-microbial-communities-in-a-tropical-urban-waterway
#16
Gourvendu Saxena, Suparna Mitra, Ezequiel M Marzinelli, Chao Xie, Toh Jun Wei, Peter D Steinberg, Rohan B H Williams, Staffan Kjelleberg, Federico M Lauro, Sanjay Swarup
Growing demands for potable water have led to extensive reliance on waterways in tropical megacities. Attempts to manage these waterways in an environmentally sustainable way generally lack an understanding of microbial processes and how they are influenced by urban factors, such as land use and rain. Here, we describe the composition and functional potential of benthic microbial communities from an urban waterway network and analyze the effects of land use and rain perturbations on these communities. With a sequence depth of 3 billion reads from 48 samples, these metagenomes represent nearly full coverage of microbial communities...
May 2018: MSystems
https://www.readbyqxmd.com/read/29894862/phytochemicals-inhibit-the-immunosuppressive-functions-of-myeloid-derived-suppressor-cells-mdsc-impact-on-cancer-and-age-related-chronic-inflammatory-disorders
#17
REVIEW
Antero Salminen, Kai Kaarniranta, Anu Kauppinen
Traditional herbal medicine has provided natural remedies against cancers and many age-related inflammatory diseases for thousands of years. Modern drug discovery techniques have revealed several active ingredients and their medicinal targets have been characterized. Concurrently, there has been great progress in understanding the pathological mechanisms underpinning cancers and inflammatory diseases. These studies have demonstrated that immature myeloid-derived suppressor cells (MDSCs) have a crucial role in the immune escape of cancer cells thus promoting tumor growth...
June 8, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29885424/common-social-cognitive-impairments-do-not-mean-common-causes-a-commentary-on-cotter-et-al-2018
#18
David Dodell-Feder, Laura T Germine
Many clinical conditions, ranging from psychiatric to neurodegenerative illnesses, are associated with impairment in the processes by which we perceive, interpret, and respond to social information; a suite of abilities known as social cognition. Through a systematic review of meta-analyses, Cotter et al. (2018) present a compelling view of social cognitive deficits as a core phenotype of many clinical conditions. However, we caution against one potential interpretation of their findings, namely, that similar social cognitive outcomes are produced by similar causes...
June 6, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29884571/health-protective-behavior-following-required-arsenic-testing-under-the-new-jersey-private-well-testing-act
#19
Sara V Flanagan, Jessie A Gleason, Steven E Spayd, Nicholas A Procopio, Megan Rockafellow-Baldoni, Stuart Braman, Steven N Chillrud, Yan Zheng
Exposure to naturally occurring arsenic in groundwater is a public health concern, particularly for households served by unregulated private wells. At present, one of the greatest barriers to exposure reduction is a lack of private well testing due to difficulties in motivating individual private well owners to take protective actions. Policy and regulations requiring testing could make a significant contribution towards universal screening of private well water and arsenic exposure reduction. New Jersey's Private Well Testing Act (PWTA) requires tests for arsenic during real estate transactions; however, the regulations do not require remedial action when maximum contaminant levels (MCLs) are exceeded...
June 5, 2018: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/29879257/naturopathic-self-treatment-of-an-atypical-fibroxanthoma-lessons-for-dermatologic-surgery
#20
Brandon Worley, Andrew J Nemechek, Samantha Stoler, Joel L Cohen
BACKGROUND: Alternative therapies are favored by some patients. In skin cancer, this may be to try to avoid surgery out of fear for the procedure and its functional or cosmetic consequences. Frequently, use of these therapies is not curative and can cause harm. Our objective is to detail a case where black salve was used as a natural remedy for an atypical fibroxanthoma and resulted in a severe burn. We highlight the challenges of communicating effective treatment options for those who have strong beliefs concerning natural remedies after a cancer diagnosis...
June 1, 2018: Journal of Drugs in Dermatology: JDD
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