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https://www.readbyqxmd.com/read/29149752/hazard-assessment-of-hydraulic-fracturing-chemicals-using-an-indexing-method
#1
Guangji Hu, Tianyi Liu, James Hager, Kasun Hewage, Rehan Sadiq
The rapid expansion of unconventional natural gas production has triggered considerable public concerns, particularly regarding environmental and human health (EHH) risks posed by various chemical additives used in hydraulic fracturing (HF) operations. There is a need to assess the potential EHH hazards of additives used in real-world HF operations. In this study, HF additive and fracturing fluid data was acquired, and EHH hazards were assessed using an indexing approach. The indexing system analyzed chemical toxicological data of different ingredients contained within additives and produced an aggregated EHH safety index for each additive, along with an indicator describing the completeness of the chemical toxicological data...
November 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29149650/iron-chelation-therapy-in-lower-ipss-risk-myelodysplastic-syndromes-which-subtypes-benefit
#2
Shannon A Wong, Heather A Leitch
BACKGROUND: Analyses suggest MDS patients with higher serum ferritin levels (SF) have inferior overall survival (OS), in one study across MDS subtypes. Multiple analyses suggest those with high SF receiving iron chelation therapy (ICT) have superior OS, but which MDS subtypes benefit from ICT remains undefined. METHODS: We performed survival analyses of MDS subtypes by receipt of ICT. RESULTS: 182 MDS were lower IPSS risk and received red blood cell (RBC) transfusions; 63 received ICT...
November 11, 2017: Leukemia Research
https://www.readbyqxmd.com/read/29149570/seagrass-mediated-phosphorus-and-iron-solubilisation-in-tropical-sediments
#3
Kasper Elgetti Brodersen, Klaus Koren, Maria Mosshammer, Peter Ralph, Michael Kühl, Jakob Santner
Tropical seagrasses are nutrient limited owing to the strong phosphorus fixation capacity of carbonate-rich sediments, yet they form densely-vegetated, multi-species meadows in oligotrophic tropical waters. Using a novel combination of high-resolution, two-dimensional chemical imaging of O2, pH, iron, sulphide, calcium and phosphorus, we found that tropical seagrasses are able to mobilize the essential nutrients iron and phosphorus in their rhizosphere via multiple biogeochemical pathways. We show that tropical seagrasses mobilize phosphorus and iron within their rhizosphere via plant-induced local acidification, leading to dissolution of carbonates and release of phosphate, and via local stimulation of microbial sulphide production, causing reduction of insoluble Fe(III) oxyhydroxides to dissolved Fe(II) with concomitant phosphate release into the rhizosphere porewater...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29149555/mapping-the-reactions-in-a-single-zero-valent-iron-nanoparticle
#4
Lan Ling, Xiao-Yue Huang, Meirong Li, Wei-Xian Zhang
Nanoscale zero-valent iron (nZVI) posseses unique functionalities for metal-metalloid removal and sequestration. So far, direct evidence on the heavy metal-iron reactions in the solid phase is still limited due to low concentration of heavy metals and small size of nanoparticles. In this work, angstrom-resolution spectral mappings on the reactions of nZVI with chromate, arsenate, nickel, silver, cesium, and zinc ions are presented. This work was achieved with spherical aberration-corrected scanning transmission electron microscopy integrated with high-sensitivity X-ray energy-dispersive spectroscopy scanning transmission electron microscopy (XEDS-STEM)...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29149510/transferrin-as-a-predictor-of-survival-in-cirrhosis
#5
André Viveiros, Armin Finkenstedt, Benedikt Schaefer, Mattias Mandorfer, Bernhard Scheiner, Konrad Lehner, Moritz Tobiasch, Thomas Reiberger, Herbert Tilg, Michael Edlinger, Heinz Zoller
BACKGROUND AND AIMS: Patients with cirrhosis frequently present with high serum ferritin and low transferrin concentrations, reflecting impaired liver function and inflammation. Recent studies have shown that transferrin and its saturation with iron are MELD-independent predictors of mortality in patients with acute on chronic liver failure or decompensated cirrhosis. The aim of this study was to evaluate the prognostic utility of serum iron parameters in relation to markers of liver function and immune activation...
November 17, 2017: Liver Transplantation
https://www.readbyqxmd.com/read/29149480/the-characterisation-of-iron-iii-in-seawater-and-related-toxicity-to-early-life-stages-of-scleractinian-corals
#6
Justin Leigh-Smith, Amanda Reichelt-Brushett, Andrew L Rose
Currently toxicity data for iron (Fe) in seawater is limited; furthermore these data are of poor quality due to the importance of Fe solubility in test solutions being overlooked. This study characterised the solubility and lability of Fe(III) in seawater and then examined the effects of Fe(III) on the fertilisation success and larval survival of the tropical marine scleractinian corals Acropora spathulata and Platygyra daedalea. Here we present the first assessment of the effects of Fe on the early life stages of scleractinian corals...
November 17, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29149437/a-blinded-randomized-placebo-controlled-study-to-investigate-the-efficacy-and-safety-of-ferric-carboxymaltose-in-iron-deficient-patients-with-fibromyalgia
#7
Chad S Boomershine, Todd A Koch, David Morris
INTRODUCTION: This study sought to compare efficacy and safety of ferric carboxymaltose vs. placebo in iron-deficient patients with fibromyalgia. METHODS: This blinded, placebo-controlled, phase 2 study randomized adults with fibromyalgia and Revised Fibromyalgia Impact Questionnaire (FIQR) scores ≥ 60, ferritin levels < 0.05 µg/ml, and transferrin saturation < 20% (1:1) to receive ferric carboxymaltose [15 mg/kg (up to 750 mg)], or placebo (15 cc normal saline) intravenously on study days 0 and 5...
November 17, 2017: Rheumatology and Therapy
https://www.readbyqxmd.com/read/29149240/z-scores-based-methods-and-their-application-to-biological-monitoring-an-example-in-professional-soccer-players
#8
Guillaume Saulière, Jérôme Dedecker, Laurie-Anne Marquet, Pierre Rochcongar, Jean-Francois Toussaint, Geoffroy Berthelot
The clinical and biological follow-up of individuals, such as the biological passport for athletes, is typically based on the individual and longitudinal monitoring of hematological or urine markers. These follow-ups aim to identify abnormal behavior by comparing the individual's biological samples to an established baseline. These comparisons may be done via different ways, but each of them requires an appropriate extra population to compute the significance levels, which is a non-trivial issue. Moreover, it is not necessarily relevant to compare the measures of a biomarker of a professional athlete to that of a reference population (even restricted to other athletes), and a reasonable alternative is to detect the abnormal values by considering only the other measurements of the same athlete...
November 15, 2017: Biostatistics
https://www.readbyqxmd.com/read/29149085/the-design-and-characterization-of-a-prototype-wideband-voltage-sensor-based-on-a-resistive-divider
#9
Fernando Garnacho, Abderrahim Khamlichi, Jorge Rovira
The most important advantage of voltage dividers over traditional voltage transformers is that voltage dividers do not have an iron core with non-linear hysteresis characteristics. The voltage dividers have a linear behavior with respect to over-voltages and a flat frequency response larger frequency range. The weak point of a voltage divider is the influence of external high-voltage (HV) and earth parts in its vicinity. Electrical fields arising from high voltages in neighboring phases and from ground conductors and structures are one of their main sources for systematic measurement errors...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29148959/effect-of-measuring-%C3%AE-glutamyl-transpeptidase-and-using-smoflipid-in-a-parenteral-nutrition-infusion-in-a-patient-with-severe-malabsorption-and-overlapping-primary-sclerosing-cholangitis-and-ulcerative-colitis
#10
Merin Kinikini
Studies discussing inflammation and oxidative stress state that these conditions are known contributors in the pathogenesis of cholestatic diseases and ulcerative colitis, and studies examining patients with liver disease have found decreased antioxidant status and significant elevation of lipid peroxides as compared with healthy subjects. One hypothesis in liver disease is that deficient antioxidant defense mechanisms may lead to excess oxygen free radical formation, which promotes deleterious processes in the liver...
November 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29148925/degradation-of-chlordecone-and-beta-hexachlorocyclohexane-by-photolysis-photo-fenton-oxidation-and-ozonation
#11
Germán Cruz-González, Carine Julcour, Hélène Chaumat, Valérie Bourdon, Felipe Ramon-Portugal, Sarra Gaspard, Ulises J Jáuregui-Haza, Henri Delmas
Intensive use of chlorinated pesticides from the 1960s to the 1990s has resulted in a diffuse contamination of soils and surface waters in the banana-producing areas of the French West Indies. The purpose of this research was, for the first time, to examine the degradation of two of these persistent pollutants - chlordecone (CLD) and beta-hexachlorocyclohexane (β-HCH) in 1 mg L(-1) synthetic aqueous solutions by means of photolysis, (photo-) Fenton oxidation and ozonation processes. Fenton oxidation is not efficient for CLD and yields less than 15% reduction of β-HCH concentration in 5 h...
November 17, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29148917/evaluation-of-antibacterial-activity-and-toxic-metal-removal-of-chemically-synthesized-magnetic-iron-oxide-titanium-coated-nanoparticles-and-application-in-bacterial-treatment
#12
Yasser A M Abdulhady, Mona M El-Shazly, Reham F El-Kased
Co-precipitation method was used for preparation of two types of iron oxide nanoparticles coated by titanium dioxide according to divalent salts used. The average size of iron oxide nanoparticles coated by titanium dioxide measured by particle size analyzer, ranged approximately between 20 nm and 100 nm with mean particle size of 60 nm. Characterization of the prepared nanoparticles was done by X-ray diffraction analysis and scanning electron microscope indicating the sole existence of inverse cubic spinel phase of magnetic iron oxide nanoparticles...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29148793/light-and-magnetic-dual-responsive-pickering-emulsion-micro-reactors
#13
Chun-Yan Xie, Shi-Xin Meng, Long-Hui Xue, Rui-Xue Bai, Xin Yang, Yaolei Wang, Zhong-Ping Qiu, Bernard P Binks, Ting Guo, Tao Meng
Emulsion droplets can serve as ideal compartments for reactions. In fact, in many cases, the chemical reactions are supposed to be triggered at a desired position and time without change of the system environment. Here, we present a type of light and magnetic dual-responsive Pickering emulsion micro-reactor by co-adsorption of light-sensitive titania (TiO2) and super paramagnetic iron oxide (Fe3O4) nanoparticles at the oil-water interface of emulsion droplets. The droplets encapsulating different reactants in advance can be driven close to each other by an external magnetic field, and then chemical reaction is triggered by UV illumination due to the contact of the isolated reactants as a result of droplet coalescence...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148757/cross-linked-artificial-enzyme-crystals-as-heterogeneous-catalysts-for-oxidation-reactions
#14
Sarah Lopez, Laurianne Rondot, Chloé Leprêtre, Caroline Marchi-Delapierre, Stéphane Ménage, Christine Cavazza
Designing systems that merge the advantages of heterogeneous catalysis, enzymology and molecular catalysis represents the next major goal for sustainable chemistry. Cross-linked enzyme crystals display most of these essential assets (well-designed mesoporous support, protein selectivity, molecular recognition of substrates). Nevertheless, a lack of reaction diversity, particularly in the field of oxidation, remains a constraint for their increased use in the field. Here, thanks to the design of cross-linked artificial non-heme iron oxygenase crystals, we filled this gap by developing bio-based heterogeneous catalysts capable of oxidizing carbon-carbon double bonds...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148750/catalytic-cyclopropanation-by-myoglobin-reconstituted-with-iron-porphycene-acceleration-of-catalysis-due-to-rapid-formation-of-the-carbene-species
#15
Koji Oohora, Hiroyuki Meichin, Liming Zhao, Matthew W Wolf, Akira Nakayama, Jun-Ya Hasegawa, Nicolai Lehnert, Takashi Hayashi
Myoglobin reconstituted with iron porphycene catalyzes the cyclopropanation of styrene with ethyl diazoacetate. Compared to native myoglobin, the reconstituted protein significantly accelerates the catalytic reaction and the kcat/Km value is 26-fold enhanced. Mechanistic studies indicate that the reaction of the reconstituted protein with ethyl diazoacetate is 615-fold faster than that of native myoglobin. The metallocarbene species reacts with styrene with the apparent second-order kinetic constant of 28 mM-1s-1 at 25 °C...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148747/investigation-of-the-iron-peroxo-complex-in-the-fenton-reaction-kinetic-indication-decay-kinetics-and-hydroxyl-radical-yields
#16
Hanna Laura Wiegand, Christian Timon Orths, Klaus Kerpen, Holger Volker Lutze, Torsten Claus Schmidt
The Fenton reaction describes the reaction of Fe(II) with hydrogen peroxide. Several researchers proposed the formation of an intermediate iron-peroxo-complex but experimental evidence for its existence is still missing. The present study investigates formation and life time of this intermediate at various conditions such as different Fe(II)-concentrations, absence vs. presence of a hydroxyl radical scavenger (dimethylsulfoxide, DMSO), and different pH values. Obtained results indicate that the iron-peroxo-complex is formed under all experimental conditions...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29148316/recognition-dynamics-of-trinuclear-copper-cluster-and-associated-histidine-residues-through-conserved-or-semi-conserved-water-molecules-in-human-ceruloplasmin-the-involvement-of-aspartic-and-glutamic-acid-gates
#17
Bishnu Prasad Mukhopadhyay
Human Ceruloplasmin belongs to the family of multi-copper oxidases and it is involved in different physiological processes, copper ion transport, iron metabolism, iron homeostasis, and biogenic amine metabolism. MD-simulation studies have indicated the higher hydrophilic susceptibility of the trinuclear copper cluster in native CP compared to its oxygen bound form. The copper (T2/T3) atom Cu3047 of the cluster, which is close to T1 copper center Cu3052 (~13 Å) has a higher affinity for water molecules compared to other copper centers...
November 17, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29148118/role-of-the-combination-of-fa-and-t2-parameters-as-a-new-diagnostic-method-in-therapeutic-evaluation-of-parkinson-s-disease
#18
Yuan Fang, Tao Zheng, Lanxiang Liu, Dawei Gao, Qinglei Shi, Yanchao Dong, Dan Du
BACKGROUND: Simple diffusion delivery (SDD) has attained good effects with only tiny amounts of drugs. Fractional anisotropy (FA) and relaxation time T2* that indicate the integrity of fiber tracts and iron concentration within brain tissue were used to evaluate the therapeutic effect of SDD. PURPOSE: To evaluate therapeutic effect of SDD in the Parkinson's disease (PD) rat model with FA and T2* parameters. STUDY TYPE: Prospective case-control animal study...
November 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29147843/iron-and-infection
#19
REVIEW
Tomas Ganz
Iron is an essential trace metal for nearly all infectious microorganisms, and host defense mechanisms target this dependence to deprive microbes of iron. This review highlights mechanisms that are activated during infections to restrict iron on mucosal surfaces, in plasma and extracellular fluid, and within macrophages. Iron overload disorders, such as hereditary hemochromatosis or β-thalassemia, interfere with iron-restrictive host responses, and thereby cause increased susceptibility to infections with microbes that can exploit this vulnerability...
November 16, 2017: International Journal of Hematology
https://www.readbyqxmd.com/read/29147753/defective-wnt-signaling-associates-with-bone-marrow-fibrosis-a-cross-sectional-cohort-study-in-a-family-with-wnt1-osteoporosis
#20
R E Mäkitie, R Niinimäki, S Kakko, T Honkanen, P E Kovanen, O Mäkitie
This study explores bone marrow function in patients with defective WNT1 signaling. Bone marrow samples showed increased reticulin and altered granulopoiesis while overall hematopoiesis was normal. Findings did not associate with severity of osteoporosis. These observations provide new insight into the role of WNT signaling in bone marrow homeostasis. INTRODUCTION: WNT signaling regulates bone homeostasis and survival and self-renewal of hematopoietic stem cells. Aberrant activation may lead to osteoporosis and bone marrow pathology...
November 16, 2017: Osteoporosis International
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