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https://www.readbyqxmd.com/read/28107756/photocatalytic-reduction-of-cs-i-ions-removed-by-combined-maghemite-titania-pva-alginate-beads-from-aqueous-solution
#1
Zohreh Majidnia, Mohamad Ali Fulazzaky
The presence of Cs(I) ions in nuclear wastewater becomes an important issue for the reason of its high toxicity. The development of adsorbent embedded metal-based catalysts that has sufficient adsorption capacity is expected for the removal of Cs(I) ions from contaminated water. This study tested the use of maghemite, titania and combined maghemite-titania polyvinyl alcohol (PVA)-alginate beads as an adsorbent to remove Cs(I) ions from aqueous solution with the variables of pH and initial concentration using batch experiments under sunlight...
January 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28107731/natural-amelioration-of-zinc-oxide-nanoparticle-toxicity-in-fenugreek%C3%A2-trigonella-foenum-gracum-by-arbuscular-mycorrhizal-glomus-intraradices-secretion-of-glomalin
#2
Narges Ghasemi Siani, Seyfollah Fallah, Lok Raj Pokhrel, Ali Rostamnejadi
Owing to rising production and use of engineered nanoparticles (ENPs) in the myriad of consumer applications, ENPs are being released into the environment where their potential fate and effects have remained unclear. With naturally occurring arbuscular mycorrhizal fungus (AMF; Glomus intraradices) in soils, their influence (positive or negative) on ENPs toxicity in plants is not well documented. Herein, we investigated potential influence of AMF on the growth and development in fenugreek (Trigonella foenum-graecum) under varied Zinc oxide nanoparticles (ZnONPs) treatments (0, 125, 250, 375 and 500 μg g(-1))...
January 3, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28107723/novel-recyclable-adsorbent-for-the-removal-of-copper-ii-and-lead-ii-from-aqueous-solution
#3
Yaolan Niu, Kan Li, Diwen Ying, Yalin Wang, Jinping Jia
Adsorbents synthesized with biopolymer have been widely used in the removal of toxic metal ions. Novel high-efficiency, recyclable, and low-cost adsorbents have received more and more attention. Chitosan and cellulose are the most abundant biopolymers in nature. Composite modified adsorbent (CSTEC) was synthesized as novel fibrous materials for the adsorption of Cu(2+) and Pb(2+) ions from water in this study. The functional fiber was characterized to investigate the surface appearance, functional groups, crystallinity, and thermal stability...
January 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28107662/a-simple-and-powerful-co-delivery-system-based-on-ph-responsive-metal-organic-frameworks-for-enhanced-cancer-immunotherapy
#4
Fei Duan, Xiaochen Feng, Xinjian Yang, Wentong Sun, Yi Jin, Huifang Liu, Kun Ge, Zhenhua Li, Jinchao Zhang
Tumor-associated antigens (TAAs)-loaded nanoparticles are able to be actively internalized by antigen-presenting cells (APCs) and have shown promising potential in cancer immunotherapy. However, current TAAs delivery strategy exhibits limitations of complicated synthesis process, low loading efficiency and inefficient CD8(+) cytotoxic T lymphocyte activation leading to unsatisfactory therapeutic effect. Thus, the construction of novel TAAs-delivery systems for enhanced cancer therapy is highly desirable. In this work, we fabricated a very simple yet powerful antigens-delivery system for cancer immunotherapy based-on pH-responsive metal-organic frameworks (MOFs) with size about 30 nm...
January 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28107647/programmed-ribosomal-frameshifting-generates-a-copper-transporter-and-a-copper-chaperone-from-the-same-gene
#5
Sezen Meydan, Dorota Klepacki, Subbulakshmi Karthikeyan, Tõnu Margus, Paul Thomas, John E Jones, Yousuf Khan, Joseph Briggs, Jonathan D Dinman, Nora Vázquez-Laslop, Alexander S Mankin
Metal efflux pumps maintain ion homeostasis in the cell. The functions of the transporters are often supported by chaperone proteins, which scavenge the metal ions from the cytoplasm. Although the copper ion transporter CopA has been known in Escherichia coli, no gene for its chaperone had been identified. We show that the CopA chaperone is expressed in E. coli from the same gene that encodes the transporter. Some ribosomes translating copA undergo programmed frameshifting, terminate translation in the -1 frame, and generate the 70 aa-long polypeptide CopA(Z), which helps cells survive toxic copper concentrations...
January 19, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28106848/a-new-strategy-for-heavy-metal-polluted-environments-a-review-of-microbial-biosorbents
#6
REVIEW
Ayansina Segun Ayangbenro, Olubukola Oluranti Babalola
Persistent heavy metal pollution poses a major threat to all life forms in the environment due to its toxic effects. These metals are very reactive at low concentrations and can accumulate in the food web, causing severe public health concerns. Remediation using conventional physical and chemical methods is uneconomical and generates large volumes of chemical waste. Bioremediation of hazardous metals has received considerable and growing interest over the years. The use of microbial biosorbents is eco-friendly and cost effective; hence, it is an efficient alternative for the remediation of heavy metal contaminated environments...
January 19, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28105571/metal-stress-in-zooplankton-diapause-production-post-hatching-response
#7
Adriana Aránguiz-Acuña, Pablo Pérez-Portilla
Aquatic organisms commonly respond to harsh conditions by forming diapausing stages, which enable populations to survive adverse periods forming egg banks. Production of diapausing eggs is frequently observed in monogonont rotifers, previously changing from asexual to partial sexual reproduction (mixis). In despite that zooplankton are frequently used in ecotoxicological assessment because of their sensitivity to various toxicants and their important role in the ecosystems, toxicity evaluations often consider the directly exposed population produced by parthenogenetic reproduction, exclusively...
January 19, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28105488/effects-of-ceo2-nanoparticles-on-terrestrial-isopod-porcellio-scaber-comparison-of-ceo2-biological-potential-with-other-nanoparticles
#8
Olga Malev, Polonca Trebše, Małgorzata Piecha, Sara Novak, Bojan Budič, Miroslav D Dramićanin, Damjana Drobne
Nano-sized cerium dioxide (CeO2) particles are emerging as an environmental issue due to their extensive use in automobile industries as fuel additives. Limited information is available on the potential toxicity of CeO2 nanoparticles (NPs) on terrestrial invertebrates through dietary exposure. In the present study, the toxic effects of CeO2 NPs on the model soil organism Porcellio scaber were evaluated. Nanotoxicity was assessed by monitoring the lipid peroxidation (LP) level and feeding rate after 14-days exposure to food amended with nano CeO2...
January 19, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28105392/in-vivo-long-term-biodistribution-excretion-and-toxicology-of-pegylated-transition-metal-dichalcogenides-ms2-m-mo-w-ti-nanosheets
#9
Jiali Hao, Guosheng Song, Teng Liu, Xuan Yi, Kai Yang, Liang Cheng, Zhuang Liu
With unique 2D structures and intriguing physicochemical properties, various types of transition metal dichalcogenides (TMDCs) have attracted much attention in many fields including nanomedicine. Hence, it is of great importance to carefully study the in vivo biodistribution, excretion, and toxicology profiles of different TMDCs, and hopefully to identify the most promising type of TMDCs with low toxicity and fast excretion for further biomedical applications. Herein, the in vivo behaviors of three representative TMDCs including molybdenum dichalcogenides (MoS2), tungsten dichalcogenides (WS2), and titanium dichalcogenides (TiS2) nanosheets are systematically investigated...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28104478/toxicological-effects-of-the-waste-of-the-sugarcane-industry-used-as-agricultural-fertilizer-on-the-test-system-allium-cepa
#10
Leonardo Ramos Anacleto, Matheus Mantuanelli Roberto, Maria Aparecida Marin-Morales
Sugarcane is cultivated in tropical countries for sugar and ethanol production. In Brazil, this culture is among the most profitable with a production of 658.7 million tons/harvest. Sugarcane filter cake (SCFC) is a waste rich in organic matter and micronutrients, but also contains toxic metals. As it has been used as fertilizer and there is not enough knowledge about its environmental impacts, this work assessed the genotoxicogenetic effects of raw SCFC and associations with soil and sugarcane bagasse (SCB), by Allium cepa tests...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28104343/thyroid-pathology-in-deer-mice-peromyscus-maniculata-from-a-reclaimed-mine-site-on-the-athabasca-oil-sands
#11
Ahmad Movasseghi, Jaime Rodríguez-Estival, Judit E G Smits
Information on naturally occurring thyroid disease in wild animals in general and in small mammals specifically is extremely limited. In the present field-based work, we investigated the structure and function of thyroid glands of deer mice (Peromyscus maniculata) studied as sentinels of ecosystem sustainability on reclaimed areas post-mining on the oil sands of northeastern Alberta, because of their greater sensitivity to contaminants relative to meadow voles (Microtus pennsylvanicus) on the same sites. Extraction of bitumen in the oil sands of northeastern Alberta, results in the release of contaminants including polycyclic aromatic compounds (PACs), metals, and metalloids to the environment that have a measurable biological cost to wildlife living in the affected areas...
January 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28103776/small-and-hungry-micrornas-in-micronutrient-homeostasis-of-plants
#12
Prashanti Patel, Karuna Yadav, Thumballi Ramabhatta Ganapathi
MicroRNAs are emerging players in plant development and response to stresses, both biotic and abiotic such as micronutrient deficiency. These small RNAs regulate cognate downstream targets either by transcript cleavage or translational inhibition. Micronutrient deficiencies lead to poor quality and yield of crops and impaired human health. Over the years several microRNAs have been identified which regulate expression of genes controlling uptake, mobilization and homeostasis of macronutrients such as nitrogen, phosphorus and sulfur to ensure sufficiency without toxicity...
January 17, 2017: MicroRNA
https://www.readbyqxmd.com/read/28103487/a-turn-on-thiol-functionalized-fluorescent-carbon-quantum-dot-based-chemosensory-system-for-arsenite-detection
#13
Pooja D, Sonia Saini, Anupma Thakur, Baban Kumar, Sachin Tyagi, Manoj K Nayak
Carbon quantum dots (CQDs) have emerged out as promising fluorescent probes for hazardous heavy metals detection in recent past. In this study, water soluble CQDs were synthesized by facile microwave pyrolysis of citric acid & cysteamine, and functionalized with ditheritheritol to impart thiol functionalities at surface for selective detection of toxic arsenite in water. Microscopic analysis reveals that the synthesized CQDs are of uniform size (diameter ∼5nm) and confirmed to have surface SH groups by FT-IR...
January 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28101712/herbicides-and-trace-metals-in-urban-waters-in-melbourne-australia-2011-12-concentrations-and-potential-impact
#14
Mayumi Allinson, Pei Zhang, AnhDuyen Bui, Jackie H Myers, Vincent Pettigrove, Gavin Rose, Scott A Salzman, Robert Walters, Graeme Allinson
Urban stormwater samples were collected from five aquatic systems in Melbourne, Australia, on six occasions between October 2011 and March 2012 and tested for 30 herbicides and 14 trace metals. Nineteen different herbicides were observed in one or more water samples from the five sites; chemicals observed at more than 40% of sites were simazine (100%), MCPA (83%), diuron (63%) and atrazine (53%). Using the toxicity unit (TU) concept to assess potential risk to aquatic ecosystems, none of the detected herbicides were considered to pose an individual, group or collective short-term risk to fish or zooplankton in the waters studied...
January 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28100224/radical-scavenging-activities-of-lagerstroemia-speciosa-l-pers-petal-extracts-and-its-hepato-protection-in-ccl4-intoxicated-mice
#15
Bipransh Kumar Tiwary, Somit Dutta, Priyankar Dey, Mossaraf Hossain, Anoop Kumar, Sony Bihani, Ashis Kumar Nanda, Tapas Kumar Chaudhuri, Ranadhir Chakraborty
BACKGROUND: Lagerstroemia speciosa (L.) Pers. has medicinal importance. Bioactive phytochemicals isolated from different parts of L. speciosa, have revealed hypoglycemic, antibacterial, anti-inflammatory, antioxidant and hepato protective properties. Despite one report from Philippines detailing the use of L. speciosa as curative for fever and as well as diuretic, there is no experimental evidence about the hepatoprotective activity of the flower extracts. METHODS: Several spectroscopic methods, including GC-MS, were used to characterize phytochemicals present in the petal extract of L...
January 18, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28100131/influence-of-activated-sewage-sludge-amendment-on-pahs-removal-efficiency-from-a-naturally-contaminated-soil-application-of-the-landfarming-treatment
#16
Borislava Lukić, David Huguenot, Antonio Panico, Eric D van Hullebusch, Giovanni Esposito
The removal of polycyclic aromatic hydrocarbons (PAHs) from a naturally co-contaminated soil by PAHs and heavy metals with an initial concentration of 620 mg of total PAHs kg(-1) dry soil was investigated. The efficiency of landfarming in removing phenanthrene, pyrene, benzo(a)pyrene and the group of total 16 US EPA PAHs was evaluated. The process was biostimulated by adding centrifuged activated sewage sludge (SS) as an organic amendment. Experimental activities were conducted in four laboratory scale reactors filled with corn cobs as bulking agent to reach bulk density of 640 kg/m(3)...
January 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28099893/lead-binding-capacity-of-calcium-pectates-with-different-molecular-weight
#17
Maksim Khotimchenko, Ksenia Makarova, Elena Khozhaenko, Valeri Kovalev
Nowadays, heavy metal contamination of environment is considered as a serious threat to public health because of toxicity of these pollutants and the lack of effective materials with metal-binding properties. Some biopolymers such as pectins were proposed for removal of metal ions from industrial water disposals. Chemical structure of pectins is quite variable and substantially affects their metal binding properties. In this work, relationship between molecular weight and Pb(II)-binding capacity of calcium pectates was investigated in a batch sorption system...
January 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28099090/nutritional-evaluation-bioaccumulation-and-toxicological-assessment-of-heavy-metals-in-edible-fruits-of-ficussurforssk-moraceae
#18
Olumuyiwa O O Ogunlaja, Roshila Moodley, Himansu Baijnath, Sreekantha B Jonnalagadda
Ficussur (Moraceae) is an indigenous medicinal plant with a wide distribution in Africa. In this study, the nutritional potential fruit of this indigenous plant to meet domestic food demands and reduce food insecurity in KwaZulu-Natal. South Africa, was investigated. The proximate composition and concentrations of metals in the edible fruits collected from eight different sites in KwaZulu-Natal were determined to assess for nutritional value and the concentrations of metals in the growth soil was determined to evaluate the impact of soil quality on elemental uptake...
February 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28098992/mechanistic-insights-into-tunable-metal-mediated-hydrolysis-of-amyloid-%C3%AE-peptides
#19
Jeffrey S Derrick, Jiwan Lee, Shin Jung C Lee, Yujeong Kim, Eunju Nam, Hyeonwoo Tak, Juhye Kang, Misun Lee, Sun Hee Kim, Kiyoung Park, Jaeheung Cho, Mi Hee Lim
An amyloidogenic peptide, amyloid-β (Aβ), has been implicated as a contributor to the neurotoxicity of Alzheimer's disease (AD) that continues to present a major socioeconomic burden for our society. Recently, the use of metal complexes capable of cleaving peptides has arisen as an efficient tactic for amyloid management; unfortunately, little has been reported to pursue this strategy. Herein, we report a novel approach to validate the hydrolytic cleavage of divalent metal complexes toward two major isoforms of Aβ (Aβ40 and Aβ42) and tune their proteolytic activity based on the choice of metal centers (M = Co, Ni, Cu, and Zn) which could be correlated to their anti-amyloidogenic properties...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28098987/predicting-copper-speciation-in-estuarine-waters-is-dissolved-organic-carbon-a-good-proxy-for-the-presence-of-organic-ligands
#20
Holly Beverley Clare Pearson, Sean David W Comber, Charlotte Braungardt, Paul J Worsfold
A new generation of speciation-based aquatic environmental quality standards (EQS) for metals have been developed using models to predict the free metal ion concentration, the most ecologically relevant form, to set site-specific values. Some countries such as the UK have moved towards this approach by setting a new estuarine and marine water EQS for copper, based on an empirical relationship between copper toxicity to mussels (Mytilus sp.) and ambient dissolved organic carbon (DOC) concentrations. This assumes an inverse relationship between DOC and free copper ion concentration owing to complexation by predominantly organic ligands...
January 18, 2017: Environmental Science & Technology
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