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https://www.readbyqxmd.com/read/29455935/engineering-pgpmos-through-gene-editing-and-systems-biology-a-solution-for-phytoremediation
#1
REVIEW
Supratim Basu, Roel C Rabara, Sangeeta Negi, Pratyoosh Shukla
In light of extensive urbanization and deforestation, toxic wastes are being released into the atmosphere, causing increased air and soil pollution. Conventional methods of soil remediation are time consuming and labor and cost intensive, rendering them uneconomical to maintain sustainable agriculture. One solution is to use natural resources like plants and microbes for phytoremediation. A thorough systemic knowledge of plant-microbe interactions will allow the use of gene editing and gene manipulation techniques to increase the efficiency of plants in phytoremediation...
February 15, 2018: Trends in Biotechnology
https://www.readbyqxmd.com/read/29455528/uranyl-to-uranium-iv-conversion-through-manipulation-of-axial-and-equatorial-ligands
#2
Nicola L Bell, Brian Shaw, Polly L Arnold, Jason B Love
The controlled manipulation of the axial oxo and equatorial halide ligands in the uranyl dipyrrin complex, UO2Cl(L) allows the uranyl reduction potential to be shifted by 1.53 V into the range accessible to naturally occurring reductants that are present during uranium remediation and storage processes. Abstraction of the equatorial halide ligand to form the uranyl cation causes a 780 mV positive shift in the UV/UIV reduction potential. Borane-functionalization of the axial oxo groups causes the spontaneous homolysis of the equatorial U-Cl bond and a further 750 mV shift of this potential...
February 18, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29454925/a-mechanistic-study-of-stable-dispersion-of-titanium-oxide-nanoparticles-by-humic-acid
#3
Yin Chen, Qian Gao, Weixiao Chen, Fan Wu, Yu Yang, David Werner, Shu Tao, Xilong Wang
Stable dispersion of nanoparticles with environmentally-friendly materials is important for their various applications including environmental remediation. In this study, we systematically examined the mechanisms of stable dispersion of two types of TiO2 nanoparticles (TNPs) with anatase and rutile crystalline structures by naturally occurring dissolved organic matter (humic acid) at different pHs, including at, below and above the Point of Zero Charge (PZC). The results showed that stable dispersion of TNPs by humic acid (HA) at all pHs tested can only be achieved with the assistance of ultra-sonication...
February 7, 2018: Water Research
https://www.readbyqxmd.com/read/29453259/common-hydraulic-fracturing-fluid-additives-alter-the-structure-and-function-of-anaerobic-microbial-communities
#4
Adam C Mumford, Denise M Akob, J Grace Klinges, Isabelle M Cozzarelli
The development of unconventional oil and gas (UOG) resources results in production of large volumes of wastewater containing a complex mixture of hydraulic fracturing chemical additives and components from the formation. Release of these wastewaters into the environment poses potential risks that are poorly understood. Microbial communities in stream sediments form the base of the food chain, and may serve as sentinels for changes in stream health. Iron reducing organisms have been shown to play a role in the biodegradation of a wide range of organic compounds, and to evaluate their response to UOG wastewater, we enriched anaerobic microbial communities from sediments collected upstream (background) and downstream (impacted) of an UOG wastewater injection disposal facility in the presence of hydraulic fracturing fluid (HFF) additives: guar gum, ethylene glycol, and two biocides, DBNPA and Bronopol...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29446234/a-natural-antioxidant-tannic-acid-mitigates-iron-overload-induced-hepatotoxicity-in-swiss-albino-mice-through-ros-regulation
#5
Tapasree Basu, Sourav Panja, Anil Khushalrao Shendge, Abhishek Das, Nripendranath Mandal
Tannic acid (TA), a water soluble natural polyphenol with 8 gallic acids groups, is abundantly present in various medicinal plants. Previously TA has been investigated for its antimicrobial and antifungal properties. Being a large polyphenol, TA chelates more than 1 metal. Hence TA has been explored for potent antioxidant activities against reactive oxygen species (ROS), reactive nitrogen species (RNS) and as iron chelator in vitro thereby mitigating iron-overload induced hepatotoxicity in vivo. Iron dextran was injected intraperitoneally in Swiss albino mice to induce iron-overload triggered hepatotoxicity, followed by oral administration of TA for remediation...
February 15, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29436559/natural-products-in-endodontics
#6
Ebtissam M Almadi, Amal A Almohaimede
Herbal remedies are used throughout the world, either in earlier or in recent times. The number of studies on this alternative therapeutic system increased in the last decades. In this paper, the relevant literature on the use of natural products in root canal therapy is revised from a MEDLINE database search. The uses of medicinal plants in endodontics include cleaning and disinfection of root canals, intracanal medicaments between appointments, sealer cements, and for removal of obturation material. Other studies showed the effect of natural products in pulpal and dentin repair...
February 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29433026/simultaneous-removal-of-nitrate-and-phosphate-from-wastewater-by-siderite-based-autotrophic-denitrification
#7
Yan Yang, Tianhu Chen, Xun Zhang, Chengsong Qing, Jin Wang, Zhengbo Yue, Haibo Liu, Zhe Yang
The potential of simultaneous removal of nitrate and phosphate from wastewater by a single anaerobic Fe(II) oxidizing denitrifiers (the strain PXL1) was assessed using siderite biofilters under different influent TOC concentrations and hydraulic retention times (HRTs) over a 160-day trial. Higher TOC concentrations promoted NO3- removal, while there was no significant influence on PO43- removal. Lowering down HRT from 10 h to 5 h did not significantly influence NO3- and PO43- removal. The NO3- removal performance and microbial community structure in the biofilters indicated that NO3- was reduced to N2 by both strain PXL1 and heterotrophic Acidovorax delafieldii...
February 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29433000/unrefined-humic-substances-as-a-potential-low-cost-amendment-for-the-management-of-acidic-groundwater-contamination
#8
Hansell Gonzalez-Raymat, Vasileios Anagnostopoulos, Miles Denham, Yong Cai, Yelena P Katsenovich
The present study explores a novel application of Huma-K, a commercially available, unrefined humic substance, as a promising low-cost source of organic matter for in situ remediation of contaminated acidic groundwater plumes. This can be achieved by creating a humic-rich coating on the surface of minerals which can enhance the sorption of contaminants from groundwater. Huma-K was characterized by means of scanning electron microscopy equipped with energy dispersive spectroscopy, Fourier-transform infrared analysis, and potentiometric titrations...
February 9, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29432929/high-molecular-weight-components-of-natural-organic-matter-preferentially-adsorb-onto-nanoscale-zero-valent-iron-and-magnetite
#9
Zhixiong Li, Gregory V Lowry, Jin Fan, Fei Liu, Jiawei Chen
Nanoscale zero valent iron particles (nano-Fe0) are attractive for in-situ groundwater remediation due to their high reactivity and ability to degrade many different classes of environmental contaminants. It is expected that adsorbed natural organic matter (NOM), which is heterogeneous and typically has a wide molecular weight (MW) distribution, will affect the reactivity and performance of nano-Fe0 as a remediation agent. However, the interaction of NOM with nano-Fe0 has not been well-studied. In this study, we used high performance size exclusion chromatography (HPSEC) to determine if there was preferential sorption of the high MW fraction of NOM onto nano-Fe0 that have a Fe0 core and a Fe-oxide shell (predominantly magnetite)...
February 9, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29428647/overview-of-as-v-adsorption-on-zr-functionalized-activated-carbon-for-aqueous-streams-remediation
#10
Litza Halla Velazquez-Jimenez, Javier Antonio Arcibar-Orozco, Jose Rene Rangel-Mendez
The present work introduces a simple methodology of carbon modification with zirconium, using an organic complexing ligand, as efficient media for selective As(V) removal. It is hypothesized that the incorporation of Zr-nanoparticles improves the attraction of anionic species such as arsenates (HAsO42-/H2AsO4-) making the material highly selective. The effects of pH (3-11) and temperature (15, 25 and 35 °C) were studied. Furthermore, potentiometric titrations, the effect of competing anions, thermodynamics, and adsorption kinetics were evaluated in order to clarify the rate-controlling process and the adsorption mechanism for arsenic removal...
February 8, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29427942/ethanol-content-in-different-gasohol-blend-spills-influences-the-decision-making-on-remediation-technologies
#11
Leonardo Vilela Steiner, Débora Toledo Ramos, Ana Maria Rubini Liedke, Maria Pilar Serbent, Henry Xavier Corseuil
Gasohol blend spills with variable ethanol content exert different electron acceptor demands in groundwater and the distinct dynamics undergone by these blends underscores the need for field-based information to aid decision-making on suitable remediation technologies for each gasohol blend spill. In this study, a comparison of two gasohol releases (E10 (10:90 ethanol and gasoline, v/v) and E25 (25:75 ethanol and gasoline, v/v) under monitored natural attenuation (MNA) and nitrate biostimulation, respectively) was conducted to assess the most effective remediation strategy for each gasohol release...
February 7, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29425955/ionic-liquids-gels-soft-materials-for-environmental-remediation
#12
Salvatore Marullo, Carla Rizzo, Nadka T Dintcheva, Francesco Giannici, Francesca D'Anna
HYPOTHESIS: Nanostructured sorbents and, in particular, supramolecular gels are emerging as efficient materials for the removal of toxic contaminants from water, like industrial dyes. It is also known that ionic liquids can dissolve significant amounts of dyes. Consequently, supramolecular ionic liquids gels could be highly efficient sorbents for dyes removal. This would also contribute to overcome the drawbacks associated with dye removal by liquid-liquid extraction with neat ionic liquids which would require large volumes of extractant and a more difficult separation of the phases...
February 2, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29425884/nanostructured-co-mn-containing-perovskites-for-degradation-of-pollutants-insight-into-the-activity-and-stability
#13
Jie Miao, Jaka Sunarso, Xiaoguang Duan, Wei Zhou, Shaobin Wang, Zongping Shao
The efficient oxidative removal of persistent organic components in wastewater relies on low-cost heterogeneous catalysts that offer high catalytic activity, stability, and recyclability. Here, we designed a series of nanostructured Co-Mn containing perovskite catalysts, LaCo1-xMnxO3+δ (LCM, x = 0, 0.3, 0.5, 0.7, and 1.0), with over-stoichiometric oxygen (δ > 0) to show superior catalytic activity for the degradation of a variety of persistent aqueous organic pollutants by activating peroxymonosulfate (PMS)...
February 2, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29425136/urinary-arsenic-in-human-samples-from-areas-characterized-by-natural-or-anthropogenic-pollution-in-italy
#14
Fabrizio Minichilli, Fabrizio Bianchi, Anna Maria Ronchi, Francesca Gorini, Elisa Bustaffa
Arsenic is ubiquitous and has a potentially adverse impact on human health. We compared the distribution of concentrations of urinary inorganic arsenic plus methylated forms (uc(iAs+MMA+DMA)) in four Italian areas with other international studies, and we assessed the relationship between uc(iAs+MMA+DMA) and various exposure factors. We conducted a human biomonitoring study on 271 subjects (132 men) aged 20-44, randomly sampled and stratified by area, gender, and age. Data on environmental and occupational exposure and dietary habits were collected through a questionnaire...
February 9, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29421747/degradation-of-di-2-ethylhexyl-phthalate-in-sediment-by-a-surfactant-enhanced-fenton-like-process
#15
Meihua Zhao, Min Cheng, Guangming Zeng, Chaosheng Zhang
This is the premier study reporting the remediation of di (2-ethylhexyl) phthalate (DEHP) contaminated sediment by a surfactant-enhanced Fenton-like system. Three widely used non-ionic surfactants were tested, and the order for desorption and solubilization of DEHP was determined as Tween 80 > Triton X-100 > Brij 35. The degradation of DEHP was studied at a near natural pH of 6.0 by two Fenton treatments: (i) Fe3+/H2O2 and (ii) Fe3+/PCA/H2O2. Results show that the addition of PCA can significantly enhance DEHP removal from 48...
February 3, 2018: Chemosphere
https://www.readbyqxmd.com/read/29421726/optimal-groundwater-security-management-policies-by-control-of-inexact-health-risks-under-dual-uncertainty-in-slope-factors
#16
Hongwei Lu, Jing Li, Lixia Ren, Yizhong Chen
Groundwater remediation is a complicated system with time-consuming and costly challenges, which should be carefully controlled by appropriate groundwater management. This study develops an integrated optimization method for groundwater remediation management regarding cost, contamination distribution and health risk under multiple uncertainties. The integration of health risk into groundwater remediation optimization management is capable of not only adequately considering the influence of health risk on optimal remediation strategies, but also simultaneously completing remediation optimization design and risk assessment...
February 1, 2018: Chemosphere
https://www.readbyqxmd.com/read/29414543/epilepsy-in-hildegard-of-bingen-s-writings-a-comprehensive-overview
#17
REVIEW
Francesco Brigo, Eugen Trinka, Bruno Brigo, Nicola Luigi Bragazzi, Giammario Ragnedda, Raffaele Nardone, Mariano Martini
Hildegard of Bingen (1098-1179AD) is one of the most relevant figures of the Middle Ages. She wrote two medical books, Physica (Natural history) and Causae et curae (Causes and remedies). Our aim was to provide a comprehensive account of Hildegard of Bingen's conception of epilepsy, of the remedies proposed to treat it, and of the medical and physiological theories behind their use. We searched Hildegard of Bingen's entire body of writings to identify any possible reference to epilepsy or epileptic seizures...
February 1, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29408560/plants-as-sources-of-natural-and-recombinant-anti-cancer-agents
#18
REVIEW
J F Buyel
Herbal remedies were the first medicines used by humans due to the many pharmacologically active secondary metabolites produced by plants. Some of these metabolites inhibit cell division and can therefore be used for the treatment of cancer, e.g. the mitostatic drug paclitaxel (Taxol). The ability of plants to produce medicines targeting cancer has expanded due to the advent of genetic engineering, particularly in recent years because of the development of gene editing systems such as the CRISPR/Cas9 platform...
February 3, 2018: Biotechnology Advances
https://www.readbyqxmd.com/read/29408122/hydrothermal-assisted-decoration-of-nis2-and-cos-nanoparticles-on-the-reduced-graphene-oxide-nanosheets-for-sunlight-driven-photocatalytic-degradation-of-azo-dye-effect-of-background-electrolyte-and-surface-charge
#19
Priyakshree Borthakur, Manash R Das
The semiconductor NiS2 nanoparticles with an average size of 10 ± 0.317 nm were successfully deposited on the reduced graphene oxide (rGO) sheets by simple hydrothermal method. The synthesized nanocomposite was characterized by various instrumental techniques like XRD, FTIR, FESEM, EDX, HRTEM, fluorescence spectrophotometer analysis. In this study we mainly focus on the determination of the surface potential values of NiS2-rGO and CoS-rGO nanocomposite under different experimental conditions and evaluated the photodegradation efficiency towards azo dye Congo Red (CR) molecule under natural sunlight irradiation...
January 16, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29407845/bimetallic-au-pd-nanoparticles-on-2d-supported-graphitic-carbon-nitride-and-reduced-graphene-oxide-sheets-a-comparative-photocatalytic-degradation-study-of-organic-pollutants-in-water
#20
Gitashree Darabdhara, Manash R Das
Novel and sustainable bimetallic nanoparticles of Au-Pd on 2D graphitic carbon nitride (g-C3N4) and reduced graphene oxide (rGO) sheets was designed adopting an eco-friendly chemical route to obtain Au-Pd/g-C3N4 and Au-Pd/rGO, respectively. Elimination of hazardous pollutants, particularly phenol from water is urgent for environment remediation due to its significant carcinogenicity. Considering this aspect, the Au-Pd/g-C3N4 and Au-Pd/rGO nanocomposites are used as photocatalyst towards degradation of toxic phenol, 2-chlorophenol (2-CP) and 2-nitrophenol (2-NP) under natural sunlight and UV light irradiation...
February 1, 2018: Chemosphere
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