Chelation of Actinides
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Effects of Calcium Chelation on Digitalis-Induced Cardiac Arrhythmias by Paul Szekely and N
Br Heart J: first published as 10.1136/hrt.25.5.589 on 1 September 1963. Downloaded from Brit. Heart J., 1963, 25, 589. EFFECTS OF CALCIUM CHELATION ON DIGITALIS-INDUCED CARDIAC ARRHYTHMIAS BY PAUL SZEKELY AND N. A. WYNNE From the Cardiovascular Department, Newcastle General Hospital, and the Department ofPhysiology, King's College, University of Durham Received November 19, 1962 Several studies have already shown that cardiac arrhythmias caused by digitalis can be abolished by the induction of hypocalcaemia (Page and Real, 1955; Smith and Grinnell, 1955; Gubner and Kallman, 1957; Kabakow and Brothers, 1958; Surawicz et al., 1959; Cohen et al., 1959; Rosenbaum, Mason, and Seven, 1960; Surawicz, 1960; Soffer, Toribara, and Sayman, 1961). The rationale of inducing hypocalcemia as an anti-arrhythmic measure is based on experimental and clinical obser- vations relating to the direct myocardial action of calcium and to the interaction between calcium, potassium, and digitalis. Low calcium concentration decreases myocardial irritability (Brooks et al., 1955) and it also increases the intracellular potassium concentration (Rosenbaum et al., 1960). There is also a synergistic action between calcium and digitalis, which was observed in the presence of digitalis intoxication (Nalbandian et al., 1957). The present study was undertaken copyright. in order to assess the value of induced hypocalcemia in the management of cardiac arrhythmias caused by digitalis. MATERIAL AND METHODS Forty-eight experiments were carried out under general aneesthesia on 46 cats and 2 dogs. Cardiac arrhythmia was induced by the intravenous administration of tincture of digitalis as previously described http://heart.bmj.com/ (Szekely and Wynne, 1951). -
5 Heavy Metals As Endocrine-Disrupting Chemicals
5 Heavy Metals as Endocrine-Disrupting Chemicals Cheryl A. Dyer, PHD CONTENTS 1 Introduction 2 Arsenic 3 Cadmium 4 Lead 5 Mercury 6 Uranium 7 Conclusions 1. INTRODUCTION Heavy metals are present in our environment as they formed during the earth’s birth. Their increased dispersal is a function of their usefulness during our growing dependence on industrial modification and manipulation of our environment (1,2). There is no consensus chemical definition of a heavy metal. Within the periodic table, they comprise a block of all the metals in Groups 3–16 that are in periods 4 and greater. These elements acquired the name heavy metals because they all have high densities, >5 g/cm3 (2). Their role as putative endocrine-disrupting chemicals is due to their chemistry and not their density. Their popular use in our industrial world is due to their physical, chemical, or in the case of uranium, radioactive properties. Because of the reactivity of heavy metals, small or trace amounts of elements such as iron, copper, manganese, and zinc are important in biologic processes, but at higher concentrations they often are toxic. Previous studies have demonstrated that some organic molecules, predominantly those containing phenolic or ring structures, may exhibit estrogenic mimicry through actions on the estrogen receptor. These xenoestrogens typically are non-steroidal organic chemicals released into the environment through agricultural spraying, indus- trial activities, urban waste and/or consumer products that include organochlorine pesticides, polychlorinated biphenyls, bisphenol A, phthalates, alkylphenols, and parabens (1). This definition of xenoestrogens needs to be extended, as recent investi- gations have yielded the paradoxical observation that heavy metals mimic the biologic From: Endocrine-Disrupting Chemicals: From Basic Research to Clinical Practice Edited by: A. -
Tracing Contamination Sources in Soils with Cu and Zn Isotopic Ratios Z Fekiacova, S Cornu, S Pichat
Tracing contamination sources in soils with Cu and Zn isotopic ratios Z Fekiacova, S Cornu, S Pichat To cite this version: Z Fekiacova, S Cornu, S Pichat. Tracing contamination sources in soils with Cu and Zn isotopic ratios. Science of the Total Environment, Elsevier, 2015, 517, pp.96-105. 10.1016/j.scitotenv.2015.02.046. hal-01466186 HAL Id: hal-01466186 https://hal.archives-ouvertes.fr/hal-01466186 Submitted on 19 Mar 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Tracing contamination sources in soils with Cu and Zn isotopic ratios Fekiacova, Z.1, Cornu, S.1, Pichat, S.2 1 INRA, UR 1119 Géochimie des Sols et des Eaux, F-13100 Aix en Provence, France 2 Laboratoire de Géologie de Lyon (LGL-TPE), Ecole Normale Supérieure de Lyon, CNRS, UMR 5276, 69007 Lyon, France Abstract Copper (Cu) and zinc (Zn) are naturally present and ubiquitous in soils and are im- portant micronutrients. Human activities contribute to the input of these metals to soils in dif- ferent chemical forms, which can sometimes reach a toxic level for soil organisms and plants. Isotopic signatures could be used to trace sources of anthropogenic Cu and Zn pollution. -
Health Concerns of Heavy Metals (Pb; Cd; Hg) and Metalloids (As)
Health concerns of the heavy metals and metalloids Chris Cooksey • Toxicity - acute and chronic • Arsenic • Mercury • Lead • Cadmium Toxicity - acute and chronic Acute - LD50 Trevan, J. W., 'The error of determination of toxicity', Proc. Royal Soc., 1927, 101B, 483-514 LD50 (rat, oral) mg/kg CdS 7080 NaCl 3000 As 763 HgCl 210 NaF 52 Tl2SO4 16 NaCN 6.4 HgCl2 1 Hodge and Sterner Scale (1943) Toxicity Commonly used term LD50 (rat, oral) Rating 1 Extremely Toxic <=1 2 Highly Toxic 1 - 50 3 Moderately Toxic 50 - 500 4 Slightly Toxic 500 - 5000 5 Practically Non-toxic 5000 - 15000 6 Relatively Harmless >15000 GHS - CLP LD50 Category <=5 1 Danger 5 - 50 2 Danger 50 - 300 3 Danger 300 - 2000 4 Warning Globally Harmonised System of Classification and Labelling and Packaging of Chemicals CLP-Regulation (EC) No 1272/2008 Toxicity - acute and chronic Chronic The long-term effect of sub-lethal exposure • Toxicity - acute and chronic • Arsenic • Mercury • Lead • Cadmium Arsenic • Pesticide o Inheritance powder • Taxidermy • Herbicide o Agent Blue • Pigments • Therapeutic uses Inorganic arsenic poisoning kills by allosteric inhibition of essential metabolic enzymes, leading to death from multi- system organ failure. Arsenicosis - chronic arsenic poisoning. Arsenic LD50 rat oral mg/kg 10000 1000 LD50 100 10 1 Arsine Arsenic acid Trimethylarsine Emerald green ArsenicArsenious trisulfide oxideSodium arsenite MethanearsonicDimethylarsinic acid acid Arsenic poisoning by volatile arsenic compounds from mouldy wall paper in damp rooms • Gmelin (1839) toxic mould gas • Selmi (1874) AsH3 • Basedow (1846) cacodyl oxide • Gosio (1893) alkyl arsine • Biginelli (1893) Et2AsH • Klason (1914) Et2AsO • Challenger (1933) Me3As • McBride & Wolfe (1971) Me2AsH or is it really true ? William R. -
Removal of Heavy Metals from Aqueous Solution by Zeolite in Competitive Sorption System
International Journal of Environmental Science and Development, Vol. 3, No. 4, August 2012 Removal of Heavy Metals from Aqueous Solution by Zeolite in Competitive Sorption System Sabry M. Shaheen, Aly S. Derbalah, and Farahat S. Moghanm rich volcanic rocks (tuff) with fresh water in playa lakes or Abstract—In this study, the sorption behaviour of natural by seawater [5]. (clinoptilolite) zeolites with respect to cadmium (Cd), copper The structures of zeolites consist of three-dimensional (Cu), nickel (Ni), lead (Pb) and zinc (Zn) has been studied in frameworks of SiO and AlO tetrahedra. The aluminum ion order to consider its application to purity metal finishing 4 4 wastewaters. The batch method has been employed, using is small enough to occupy the position in the center of the competitive sorption system with metal concentrations in tetrahedron of four oxygen atoms, and the isomorphous 4+ 3+ solution ranging from 50 to 300 mg/l. The percentage sorption replacement of Si by Al produces a negative charge in and distribution coefficients (Kd) were determined for the the lattice. The net negative charge is balanced by the sorption system as a function of metal concentration. In exchangeable cation (sodium, potassium, or calcium). These addition lability of the sorbed metals was estimated by DTPA cations are exchangeable with certain cations in solutions extraction following their sorption. The results showed that Freundlich model described satisfactorily sorption of all such as lead, cadmium, zinc, and manganese [6]. The fact metals. Zeolite sorbed around 32, 75, 28, 99, and 59 % of the that zeolite exchangeable ions are relatively innocuous added Cd, Cu, Ni, Pb and Zn metal concentrations (sodium, calcium, and potassium ions) makes them respectively. -
New Brunswick Drug Plans Formulary
New Brunswick Drug Plans Formulary August 2019 Administered by Medavie Blue Cross on Behalf of the Government of New Brunswick TABLE OF CONTENTS Page Introduction.............................................................................................................................................I New Brunswick Drug Plans....................................................................................................................II Exclusions............................................................................................................................................IV Legend..................................................................................................................................................V Anatomical Therapeutic Chemical (ATC) Classification of Drugs A Alimentary Tract and Metabolism 1 B Blood and Blood Forming Organs 23 C Cardiovascular System 31 D Dermatologicals 81 G Genito Urinary System and Sex Hormones 89 H Systemic Hormonal Preparations excluding Sex Hormones 100 J Antiinfectives for Systemic Use 107 L Antineoplastic and Immunomodulating Agents 129 M Musculo-Skeletal System 147 N Nervous System 156 P Antiparasitic Products, Insecticides and Repellants 223 R Respiratory System 225 S Sensory Organs 234 V Various 240 Appendices I-A Abbreviations of Dosage forms.....................................................................A - 1 I-B Abbreviations of Routes................................................................................A - 4 I-C Abbreviations of Units...................................................................................A -
Chelation Therapy
Medical Policy Chelation Therapy Table of Contents • Policy: Commercial • Coding Information • Information Pertaining to All Policies • Policy: Medicare • Description • References • Authorization Information • Policy History Policy Number: 122 BCBSA Reference Number: 8.01.02 NCD/LCD: N/A Related Policies None Policy Commercial Members: Managed Care (HMO and POS), PPO, and Indemnity Medicare HMO BlueSM and Medicare PPO BlueSM Members Chelation therapy in the treatment of the following conditions is MEDICALLY NECESSARY: • Extreme conditions of metal toxicity • Treatment of chronic iron overload due to blood transfusions (transfusional hemosiderosis) or due to nontransfusion-dependent thalassemia (NTDT) • Wilson's disease (hepatolenticular degeneration), or • Lead poisoning. Chelation therapy in the treatment of the following conditions is MEDICALLY NECESSARY if other modalities have failed: • Control of ventricular arrhythmias or heart block associated with digitalis toxicity • Emergency treatment of hypercalcemia. NaEDTA as chelation therapy is considered NOT MEDICALLY NECESSARY. Off-label applications of chelation therapy are considered INVESTIGATIONAL, including, but not limited to: • Alzheimer’s disease • Arthritis (includes rheumatoid arthritis) • Atherosclerosis, (e.g., coronary artery disease, secondary prevention in patients with myocardial infarction, or peripheral vascular disease) • Autism • Diabetes • Multiple sclerosis. 1 Prior Authorization Information Inpatient • For services described in this policy, precertification/preauthorization IS REQUIRED for all products if the procedure is performed inpatient. Outpatient • For services described in this policy, see below for products where prior authorization might be required if the procedure is performed outpatient. Outpatient Commercial Managed Care (HMO and POS) Prior authorization is not required. Commercial PPO and Indemnity Prior authorization is not required. Medicare HMO BlueSM Prior authorization is not required. -
Heavy Metals Toxicity. Int J Health Sci Res
International Journal of Health Sciences and Research www.ijhsr.org ISSN: 2249-9571 Review Article Heavy Metals Toxicity Shikha Bathla, Tanu Jain Research Scholar, Department of Food and Nutrition, Punjab Agricultural University, Ludhiana-141004. Corresponding Author: Shikha Bathla Received: 15/02/2016 Revised: 13/04/2016 Accepted: 18/04/2016 ABSTRACT A heavy metal is a member of a loosely defined subset of elements that exhibit metallic properties. It mainly includes the transition metals, some metalloids, lanthanides, and actinides. Many different definitions have been proposed based on density, atomic number or atomic weight, and some on chemical properties. Heavy metal toxicity can result in damaged central nervous function, lower energy levels, and damage to blood composition, lungs, kidneys, liver, and other vital organs. Long- term exposure may result in slowly progressing physical, muscular, and neurological degenerative diseases. Exposure to toxic or heavy metals comes from many sources like in fish, chicken, vegetables, vaccinations, dental fillings and deodorants. Remedies to combat heavy metal toxicity can be to adopt the practice of kitchen gardening and also to ensure plethora supply of antioxidant includes fruits and vegetables in the diet Increase intake of miso soup (made from soya) and garlic and regular exercise and brisk walking. Increase intake of water to detoxify the harmful effect of heavy metals. Use of lead free paints and avoids carrying metal accessories. Key words: heavy metals, lead, selenium, mercury, silicon. INTRODUCTION in body with ligands containing oxygen Metals occurrence in the (OH, -COO,-OPO3H, >C=O) sulphur (-SH, environment has become a concern because -S-S-), and nitrogen (-NH and >NH) and the globe is experiencing a silent epidemic affect the body by interaction with essential of environmental poisoning, from the ever metals, formation of metal protein complex, increasing amounts of metals released into age and stage of development, lifestyle the biosphere. -
Heavy Metals'' with ``Potentially Toxic Elements'
It’s Time to Replace the Term “Heavy Metals” with “Potentially Toxic Elements” When Reporting Environmental Research Olivier Pourret, Andrew Hursthouse To cite this version: Olivier Pourret, Andrew Hursthouse. It’s Time to Replace the Term “Heavy Metals” with “Potentially Toxic Elements” When Reporting Environmental Research. International Journal of Environmental Research and Public Health, MDPI, 2019, 16 (22), pp.4446. 10.3390/ijerph16224446. hal-02889766 HAL Id: hal-02889766 https://hal.archives-ouvertes.fr/hal-02889766 Submitted on 5 Jul 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Letter It’s Time to Replace the Term “Heavy Metals” with “Potentially Toxic Elements” When Reporting Environmental Research Olivier Pourret 1,* and Andrew Hursthouse 2,* 1 UniLaSalle, AGHYLE, 19 rue Pierre Waguet, 60000 Beauvais, France 2 School of Computing, Engineering & Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK * Correspondence: [email protected] (O.P.); [email protected] (A.H.) Received: 28 October 2019; Accepted: 12 November 2019; Published: date Abstract: Even if the Periodic Table of Chemical Elements is relatively well defined, some controversial terms are still in use. -
Rational Ligand Design for U(VI) and Pu(IV)* by Géza Szigethy BA
Rational Ligand Design for U(VI) and Pu(IV)* by Géza Szigethy B.A. (Princeton University), 2004 A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Chemistry in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Kenneth N. Raymond, Chair Professor Richard A. Andersen Professor Garrison Sposito Fall 2009 * This research and the ALS are supported by the Director, Office of Science, Office of Basic Energy Sciences (OBES), and the OBES Division of Chemical Sciences, Geosciences, and Biosciences of the U.S. Department of Energy at LBNL under Contract No. DE-AC02- 05CH11231. Rational Ligand Design for U(VI) and Pu(IV) by Géza Szigethy B.A. (Princeton University), 2004 A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Chemistry in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Kenneth N. Raymond, Chair Professor Richard A. Andersen Professor Garrison Sposito Fall 2009 Rational Ligand Design for U(VI) and Pu(IV) Copyright © 2009 Géza Szigethy Abstract Rational Ligand Design for U(VI) and Pu(IV) by Géza Szigethy Doctor of Philosophy in Chemistry University of California, Berkeley Professor Kenneth N. Raymond, Chair Nuclear power is an attractive alternative to hydrocarbon-based energy production at a time when moving away from carbon-producing processes is widely accepted as a significant developmental need. Hence, the radioactive actinide power sources for this industry are necessarily becoming more widespread, which is accompanied by the increased risk of exposure to both biological and environmental systems. -
Novel Thin-Film Polymeric Materials for the Detection of Heavy Metals
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Available online at www.sciencedirect.com Procedia Engineering 47 ( 2012 ) 322 – 325 Proc. Eurosensors XXVI, September 9-12, 2012, Kraków, Poland Novel Thin-Film Polymeric Materials for the Detection of Heavy Metals H. Ikena, D. Kirsanovb,c, A. Leginb,c and M.J. Schöninga,d,* a Institute of Nano- and Biotechnologies (INB), FH Aachen, Jülich Campus, Germany b Sensor Systems, LLC, St. Petersburg, Russia c Laboratory of Chemical Sensors, St. Petersburg University, St. Petersburg, Russia d Peter Grünberg Institute (PGI-8), Research Centre Jülich GmbH, Jülich, Germany Abstract A variety of transition metals, e.g., copper, zinc, cadmium, lead, etc. are widely used in industry as components for wires, coatings, alloys, batteries, paints and so on. The inevitable presence of transition metals in industrial processes implies the ambition of developing a proper analytical technique for their adequate monitoring. Most of these elements, especially lead and cadmium, are acutely toxic for biological organisms. Quantitative determination of these metals at low activity levels in different environmental and industrial samples is therefore a vital task. A promising approach to achieve an at-side or on-line monitoring on a miniaturized and cost efficient way is the combination of a common potentiometric sensor array with heavy metal-sensitive thin-film materials, like chalcogenide glasses and polymeric materials, respectively. © 20122012 The Published Authors. by Published Elsevier by Ltd. Elsevier Ltd. Selection and/or peer-review under responsibility of the Symposium Cracoviense Sp. z.o.o. -
Post-Injury Calcium Chelation Rescues Skeletal Muscle Regeneration in Mice Matthew .D Magda University of Connecticut - Storrs, [email protected]
University of Connecticut OpenCommons@UConn Honors Scholar Theses Honors Scholar Program Summer 8-1-2013 Post-Injury Calcium Chelation Rescues Skeletal Muscle Regeneration in Mice Matthew .D Magda University of Connecticut - Storrs, [email protected] Follow this and additional works at: https://opencommons.uconn.edu/srhonors_theses Part of the Cell Biology Commons, and the Molecular Biology Commons Recommended Citation Magda, Matthew D., "Post-Injury Calcium Chelation Rescues Skeletal Muscle Regeneration in Mice" (2013). Honors Scholar Theses. 321. https://opencommons.uconn.edu/srhonors_theses/321 1 Post-Injury Calcium Chelation Rescues Skeletal Muscle Regeneration in Mice Honors Thesis Matthew Magda Research Advisor: Dr. Morgan Carlson Honors Advisor: Dr. Kenneth Noll August 2013 2 Abstract: Antibiotics, surgery and organ transplants have pushed average lifespans towards the upper limits of the human body. Drastically reduced morbidity from infection, toxins and traumatic injury have allowed ever greater portions of the populace can reach eighty or ninety years old before dying of old age. Despite the increased role of aging as a source of morbidity, many aspects of aging are poorly characterized. Sarcopenia, progressive muscle loss, and loss of adult myogenic potential, the ability to produce new muscle tissue from adult stem cell sources, are key causes of decreased mobility and strength in aged individuals. If more youthful muscle quality could be restored in old patients they would experience greatly improved quality of life and perhaps even longer lifespans. Satellite cell populations are known to decline sharply by 6-7th decade of life but traditional treatments for sarcopenia, namely exercise intervention, have been shown to exacerbate the degeneration in aged such patients.