Synthesis and Structure of Derivatives of P(OCH2CH2)
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Electrophysiologic Evidence for Increased Endogenous Gabaergic but Not Glycinergic Inhibitory Tone in the Rat Spinal Nerve Ligation Model of Neuropathy Vesa K
Anesthesiology 2001; 94:333–9 © 2001 American Society of Anesthesiologists, Inc. Lippincott Williams & Wilkins, Inc. Electrophysiologic Evidence for Increased Endogenous GABAergic but Not Glycinergic Inhibitory Tone in the Rat Spinal Nerve Ligation Model of Neuropathy Vesa K. Kontinen, M.D., Ph.D.,* Louise C. Stanfa, Ph.D.,† Amlan Basu,‡ Anthony H. Dickenson, Ph.D.§ Background: Changes in the inhibitory activity mediated by There is evidence that both GABA and glycinergic inter- ␥-aminobutyric acid (GABA) and glycine, acting at spinal GABA A neurons are preferentially associated with the control of receptors and strychnine-sensitive glycine receptors, are of in- 6–9 terest in the development of neuropathic pain. There is ana- low-threshold afferent input to the spinal cord. Con- Downloaded from http://pubs.asahq.org/anesthesiology/article-pdf/94/2/333/402482/0000542-200102000-00024.pdf by guest on 29 September 2021 tomic evidence for changes in these transmitter systems after sistent with this, intrathecal administration of the 10 nerve injuries, and blocking either GABAA or glycine receptors GABAA-receptor antagonist bicuculline or the glycine- has been shown to produce allodynia-like behavior in awake receptor antagonist strychnine10,11 produces segmen- normal animals. tally localized tactile allodynia-like behavior in conscious Methods: In this study, the possible changes in GABAergic and glycinergic inhibitory activity in the spinal nerve ligation rats and increased responses to mechanical stimulation 12 model of neuropathic pain were studied by comparing the in anesthetized cats. Intrathecal strychnine has also effects of the GABAA-receptor antagonist bicuculline and the been shown to produce in anesthetized rats reflex re- glycine-receptor antagonist strychnine in neuropathic rats to sponses similar to those produced by nociceptive stim- their effects in sham-operated and nonoperated control rats. -
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Mutations M287L and Q266I in the Glycine Receptor ␣1 Subunit Change Sensitivity to Volatile Anesthetics in Oocytes and Neurons, but Not the Minimal Alveolar Concentration in Knockin Mice Cecilia M. Borghese, Ph.D.,* Wei Xiong, Ph.D.,† S. Irene Oh, B.S.,‡ Angel Ho, B.S.,§ S. John Mihic, Ph.D.,ʈ Li Zhang, M.D.,# David M. Lovinger, Ph.D.,** Gregg E. Homanics, Ph.D.,†† Edmond I. Eger 2nd, M.D.,‡‡ R. Adron Harris, Ph.D.§§ ABSTRACT What We Already Know about This Topic • Inhibitory spinal glycine receptor function is enhanced by vol- Background: Volatile anesthetics (VAs) alter the function of atile anesthetics, making this a leading candidate for their key central nervous system proteins but it is not clear which, immobilizing effect if any, of these targets mediates the immobility produced by • Point mutations in the ␣1 subunit of glycine receptors have been identified that increase or decrease receptor potentiation VAs in the face of noxious stimulation. A leading candidate is by volatile anesthetics the glycine receptor, a ligand-gated ion channel important for spinal physiology. VAs variously enhance such function, and blockade of spinal glycine receptors with strychnine af- fects the minimal alveolar concentration (an anesthetic What This Article Tells Us That Is New EC50) in proportion to the degree of enhancement. • Mice harboring specific mutations in their glycine receptors Methods: We produced single amino acid mutations into that increased or decreased potentiation by volatile anesthetic in vitro did not have significantly altered changes in anesthetic the glycine receptor ␣1 subunit that increased (M287L, third potency in vivo transmembrane region) or decreased (Q266I, second trans- • These findings indicate that this glycine receptor does not me- membrane region) sensitivity to isoflurane in recombinant diate anesthetic immobility, and that other targets must be receptors, and introduced such receptors into mice. -
Environmental Properties of Chemicals Volume 2
1 t ENVIRONMENTAL 1 PROTECTION Esa Nikunen . Riitta Leinonen Birgit Kemiläinen • Arto Kultamaa Environmental properties of chemicals Volume 2 1 O O O O O O O O OO O OOOOOO Ol OIOOO FINNISH ENVIRONMENT INSTITUTE • EDITA Esa Nikunen e Riitta Leinonen Birgit Kemiläinen • Arto Kultamaa Environmental properties of chemicals Volume 2 HELSINKI 1000 OlO 00000001 00000000000000000 Th/s is a second revfsed version of Environmental Properties of Chemica/s, published by VAPK-Pub/ishing and Ministry of Environment, Environmental Protection Department as Research Report 91, 1990. The pubiication is also available as a CD ROM version: EnviChem 2.0, a PC database runniny under Windows operating systems. ISBN 951-7-2967-2 (publisher) ISBN 952-7 1-0670-0 (co-publisher) ISSN 1238-8602 Layout: Pikseri Julkaisupalvelut Cover illustration: Jussi Hirvi Edita Ltd. Helsinki 2000 Environmental properties of chemicals Volume 2 _____ _____________________________________________________ Contents . VOLUME ONE 1 Contents of the report 2 Environmental properties of chemicals 3 Abbreviations and explanations 7 3.1 Ways of exposure 7 3.2 Exposed species 7 3.3 Fffects________________________________ 7 3.4 Length of exposure 7 3.5 Odour thresholds 8 3.6 Toxicity endpoints 9 3.7 Other abbreviations 9 4 Listofexposedspecies 10 4.1 Mammais 10 4.2 Plants 13 4.3 Birds 14 4.4 Insects 17 4.5 Fishes 1$ 4.6 Mollusca 22 4.7 Crustaceans 23 4.8 Algae 24 4.9 Others 25 5 References 27 Index 1 List of chemicals in alphabetical order - 169 Index II List of chemicals in CAS-number order -
Lactide/^Caprolactone Polymerization Behavior of Monomeric Aryloxytitanatrane
698 Bull. Korean Chem. Soc. 2007, Vol. 28, No. 4 Notes Synthesis, X-ray Structure, and /-Lactide/^Caprolactone Polymerization Behavior of Monomeric Aryloxytitanatrane Sang-deok Mun, Younjin Hong, and Youngjo Kim* Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea. *E-mail: 가[email protected] Received February 2, 2007 Key Words : Titanatrane, Mononuclear, Ring opening polymerization, Polylactide, Polycaprolactone The chemistry of atrane coordinated by the central nitro polymerization (ROP) of l-lactide (l-LA) or ^caprolactone gen atom as well as all three arms of deprotonated triethanol 任-CL) are now one of popular research fields in the homo amine ligand, imino-2,2',2''-triethanolate, has been inten geneous catalysis. In this regard, a new mononuclear tita- sively studied over the past few decades and its examples are natrane obtained was used as a catalyst for the ROP of l-LA now known across the periodic table.1 Most studies have and £-CL. focused on the use of main group elements such as silicon, The treatment of Ti(O-i-Pr)4 with 1 equivalent of 2,6-di- phosphorus, aluminum, and tin in the formation of atrane.1 tert-butylphenol and 1 equivalent of triethanolamine in THF In view of the well known significant number of similarities gave, after workup, novel mononuclear titanatranes 1 as in the chemistries of tin and titanium, relatively few reports orange-yellow crystals in 81% isolated yield. After recrystal have appeared concerning metallic titanatranes with a lization using toluene, 1 was used as a catalyst for making transannular N—Ti bond from bridgehead N atom in polylactide (PLA) and polycaprolactone (PCL). -
Toxicological and Pharmacological Profile of Amanita Muscaria (L.) Lam
Pharmacia 67(4): 317–323 DOI 10.3897/pharmacia.67.e56112 Review Article Toxicological and pharmacological profile of Amanita muscaria (L.) Lam. – a new rising opportunity for biomedicine Maria Voynova1, Aleksandar Shkondrov2, Magdalena Kondeva-Burdina1, Ilina Krasteva2 1 Laboratory of Drug metabolism and drug toxicity, Department “Pharmacology, Pharmacotherapy and Toxicology”, Faculty of Pharmacy, Medical University of Sofia, Bulgaria 2 Department of Pharmacognosy, Faculty of Pharmacy, Medical University of Sofia, Bulgaria Corresponding author: Magdalena Kondeva-Burdina ([email protected]) Received 2 July 2020 ♦ Accepted 19 August 2020 ♦ Published 26 November 2020 Citation: Voynova M, Shkondrov A, Kondeva-Burdina M, Krasteva I (2020) Toxicological and pharmacological profile of Amanita muscaria (L.) Lam. – a new rising opportunity for biomedicine. Pharmacia 67(4): 317–323. https://doi.org/10.3897/pharmacia.67. e56112 Abstract Amanita muscaria, commonly known as fly agaric, is a basidiomycete. Its main psychoactive constituents are ibotenic acid and mus- cimol, both involved in ‘pantherina-muscaria’ poisoning syndrome. The rising pharmacological and toxicological interest based on lots of contradictive opinions concerning the use of Amanita muscaria extracts’ neuroprotective role against some neurodegenerative diseases such as Parkinson’s and Alzheimer’s, its potent role in the treatment of cerebral ischaemia and other socially significant health conditions gave the basis for this review. Facts about Amanita muscaria’s morphology, chemical content, toxicological and pharmacological characteristics and usage from ancient times to present-day’s opportunities in modern medicine are presented. Keywords Amanita muscaria, muscimol, ibotenic acid Introduction rica, the genus had an ancestral origin in the Siberian-Be- ringian region in the Tertiary period (Geml et al. -
Strychnine Poisoning
0++- Poison HOTLINE Partnership between UnityPoint Health and University of Iowa Hospitals and Clinics November 2013 Strychnine Poisoning Strychnine is a chemical naturally found in the seeds of the tree Strychnos nux- vomica. It is mainly used as a pesticide to control rats, moles, gophers, and coyotes. Commercial baits are pelleted and often dyed red or green. Strychnine has on rare occasions been found to be mixed with street drugs such as LSD, heroin, and cocaine. Strychnine is a white, odorless, bitter tasting crystalline powder that can be taken by mouth, inhaled or given intravenously. Strychnine is highly toxic and Did you know …… only a small amount is needed to produce severe health effects in people. As little as 30 mg may cause death in an adult. Vaporizing alcohol and “smoking” the vapors (inhaling Strychnine blocks the action of the neurotransmitter glycine which controls how is a more accurate term) is a nerve signals are sent to muscles. Glycine is an inhibitory neurotransmitter and new method for alcohol works like an “off switch” for muscles. When this “off switch” is not working consumption. The alcohol is because it is being blocked by strychnine, muscles throughout the body have poured into a vaporizing severe, painful spasms. While these spasms may look like the patient is having machine or over dry ice and a seizure, it is not a true seizure and there is no post-ictal phase. Repetitive inhaled. The alcohol enters muscle spasms caused by strychnine will lead to fever, muscle break down the lungs where it is rapidly (rhabdomyolysis), severe metabolic acidosis and respiratory failure. -
A Systematic Review on Main Chemical Constituents of Papaver Bracteatum
Journal of Medicinal Plants A Systematic Review on Main Chemical Constituents of Papaver bracteatum Soleymankhani M (Ph.D. student), Khalighi-Sigaroodi F (Ph.D.)*, Hajiaghaee R (Ph.D.), Naghdi Badi H (Ph.D.), Mehrafarin A (Ph.D.), Ghorbani Nohooji M (Ph.D.) Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran * Corresponding author: Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, P.O.Box: 33651/66571, Karaj, Iran Tel: +98 - 26 - 34764010-9, Fax: +98 - 26-34764021 E-mail: [email protected] Received: 17 April 2013 Accepted: 12 Oct. 2014 Abstract Papaver bracteatum Lindly (Papaveraceae) is an endemic species of Iran which has economic importance in drug industries. The main alkaloid of the plant is thebaine which is used as a precursor of the semi-synthetic and synthetic compounds including codeine and naloxone, respectively. This systematic review focuses on main component of Papaver bracteatum and methods used to determine thebaine. All studies which assessed the potential effect of the whole plant or its extract on clinical or preclinical studies were reviewed. In addition, methods for determination of the main components, especially thebaine, which have been published from 1948 to March 2013, were included. Exclusion criteria were agricultural studies that did not assess. This study has listed alkaloids identified in P. bracteatum which reported since 1948 to 2013. Also, the biological activities of main compounds of Papaver bracteatum including thebaine, isothebaine, (-)-nuciferine have been reviewed. As thebaine has many medicinal and industrial values, determination methods of thebaine in P. bracteatum were summarized. The methods have being used for determination of thebaine include chromatographic (HPLC, GC and TLC) and non chromatographic methods. -
The Comparative Effects of Three Toxic Substances on Bluegill Behavior Mary Gerard Henry Iowa State University
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Digital Repository @ Iowa State University Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1984 The comparative effects of three toxic substances on bluegill behavior Mary Gerard Henry Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Ecology and Evolutionary Biology Commons, and the Environmental Sciences Commons Recommended Citation Henry, Mary Gerard, "The ompc arative effects of three toxic substances on bluegill behavior " (1984). Retrospective Theses and Dissertations. 8996. https://lib.dr.iastate.edu/rtd/8996 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1.The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. -
Electron Transfer and Modification of Oligosilanylsilatranes and Related
This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. Article pubs.acs.org/Organometallics Electron Transfer and Modification of Oligosilanylsilatranes and Related Derivatives † ‡ § Mohammad Aghazadeh Meshgi, Judith Baumgartner,*, Viatcheslav V. Jouikov,*, † and Christoph Marschner*, † Institut für Anorganische Chemie, Technische Universitaẗ Graz, Stremayrgasse 9, 8010 Graz, Austria ‡ Institut für Chemie, Universitaẗ Graz, Stremayrgasse 9, 8010 Graz, Austria § UMR 6226, Chimie et Photonique Moleculaires,́ Universitéde Rennes 1, 35042 Rennes, France *S Supporting Information ABSTRACT: Several silatranyl -substituted oligosilanes were prepared starting from bis(trimethylsilyl)silatranylsilanide. Electrochemical and theoretical investigations of some oligosilanes revealed that electrooxidation occurs by formation of a short-lived cation radical. This species undergoes structural relaxation to form a pair of conformers, with endo and exo relationships with respect to the Si−N interaction. Reaction of a 1,4-disilatranyl-1,4-disilanide with 1,2- dichlorotetramethyldisilane gave a mixture of cis and trans diastereomers of a cyclohexasilane with the trans isomer showing a diminished Si−N distance. ■ INTRODUCTION along the Si−N dative bond reflects the nature of Si−N − Among hypercoordinated silicon compounds silatranes (Figure bonding. In fact the Si N bonding neither is covalent nor is − 8 1) occupy a prominent position.1 4 The suffix “atrane” was based on intermolecular charge transfer. What happens with this unusual bond upon electron withdrawal, for instance during electrooxidation, is of a great interest (for classical bonds see ref 9) but is not known so far. -
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Understanding the role of Ti-rich domains in the stabilization of gold nanoparticles on mesoporous silica-based catalysts Alaina Moragues a, Begoña Puértolas b, Álvaro Mayoral c,d, Raúl Arenal c,d, Ana B. Hungría e, Sonia Murcia-Mascarós a, Stuart H. Taylor f, Benjamín Solsona g,*, Tomás Garcíab,*, Pedro Amorós a,* a Institut de Ciència dels Materials, Universitat de València, P.O. Box 22085, 46071 Valencia, Spain. b Instituto de Carboquímica (ICB-CSIC), C/ Miguel Luesma Castán 4, 50018 Zaragoza, Spain. c Laboratorio de Microscopias Avanzadas (LMA), Instituto de Nanociencia de Aragon (INA), Universidad de Zaragoza, Mariano Esquillor, 50018 Zaragoza, Spain. d Fundación Agencia Aragonesa para la Investigación y el Desarrollo (ARAID), María de Luna 11, 50018 Zaragoza, Spain. e Departamento de Ciencia de Materiales, Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Spain. f Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom. g Departamento de Ingenieria Quimica, Universitat de València, Avenida de la Universitat, 46071 Valencia, Spain. *Corresponding authors at: Institut de Ciència dels Materials, Universitat de València, P.O. Box 22085, 46071 Valencia, Spain (Pedro Amorós). E-mail addresses: [email protected], [email protected], [email protected] 1 ABSTRACT The preparation and stabilization of gold nanoparticles with a precise control of size and dispersion is highly attractive for a variety of applications, and a key aspect is thermal stability of the nanoparticles. This paper focuses on understanding the effect of TiO2-based nanodomains, dispersed on mesoporous silicas, and how they control gold nanoparticle stability. -