You need JavaScript to view this

Reactions of Hot Tritium Atoms with Amino Acids; Reactions entre Atomes Chauds de Tritium et Acides Amines; Reaktsii goryachikh atomov tritiya s aminokislotami; Reacciones de Atomos de Tritio Calientes con Aminoacidos

Conference:

Abstract

In the existing literature there is a lack of systematic data on the interaction of tritium recoil atoms with amino acids, yet such data, in conjunction with results already obtained for organic acids and amines, could help in determining the mechanism of hot reactions in relation to the structure of compounds (chain length, functional substitutes). A study was made of the yields from the reaction of hot tritium atoms: (1) with amino acids having lengthened chains, and (2) with amino acids having a carbon chain of constant length, but with various functional substitutes. For this purpose mixtures of lithium carbonate and the acids under study were irradiated for 15 min with a slow neutron flux of 0.87 x 10{sup 13} cm{sup 2}/s. Analysis was carried out on a gas chromatography unit with interchangeable columns (molecular sieves, and liquid petrolatum on kieselguhr) and with paper chromatography. Although the data obtained for the radiation survival capacity of amino acids as a function of carbon chain length were at variance with a basic tenet of radiation chemistry according to which the conservation of molecules increases in proportion to the length of their chains, the data can be explained in terms of an intramolecular  More>>
Authors:
Simonov, E. F.; Nesmejanov, An. N. [1] 
  1. Moskovskij Gosudarstvennyj Universitet, Moskva, SSSR (Russian Federation)
Publication Date:
Apr 15, 1965
Product Type:
Conference
Report Number:
IAEA-SM-57/53
Resource Relation:
Conference: Symposium on Chemical Effects Associated with Nuclear Reactions and Radioactive Transformations, Vienna (Austria), 7-11 Dec 1964; Other Information: 5 refs., 9 figs., 2 tabs.; Related Information: In: Chemical Effects of Nuclear Transformations Vol. I. Proceedings of the Symposium on Chemical Effects Associated with Nuclear Reactions and Radioactive Transformations| 457 p.
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY; AMINES; AMINO ACIDS; ATOM COLLISIONS; CARBON; CHEMICAL BONDS; DE-EXCITATION; GAS CHROMATOGRAPHY; HOT ATOM CHEMISTRY; LITHIUM CARBONATES; MOLECULAR SIEVES; MOLECULES; RADIATION EFFECTS; RECOILS; SLOW NEUTRONS; TRITIUM
OSTI ID:
22141783
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); Joint Commission on Applied Radioactivity of the International Council of Scientific Unions, Paris (France)
Country of Origin:
IAEA
Language:
Russian
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M3313096384
Submitting Site:
INIS
Size:
page(s) 411-419
Announcement Date:
Oct 24, 2013

Conference:

Citation Formats

Simonov, E. F., and Nesmejanov, An. N. Reactions of Hot Tritium Atoms with Amino Acids; Reactions entre Atomes Chauds de Tritium et Acides Amines; Reaktsii goryachikh atomov tritiya s aminokislotami; Reacciones de Atomos de Tritio Calientes con Aminoacidos. IAEA: N. p., 1965. Web.
Simonov, E. F., & Nesmejanov, An. N. Reactions of Hot Tritium Atoms with Amino Acids; Reactions entre Atomes Chauds de Tritium et Acides Amines; Reaktsii goryachikh atomov tritiya s aminokislotami; Reacciones de Atomos de Tritio Calientes con Aminoacidos. IAEA.
Simonov, E. F., and Nesmejanov, An. N. 1965. "Reactions of Hot Tritium Atoms with Amino Acids; Reactions entre Atomes Chauds de Tritium et Acides Amines; Reaktsii goryachikh atomov tritiya s aminokislotami; Reacciones de Atomos de Tritio Calientes con Aminoacidos." IAEA.
@misc{etde_22141783,
title = {Reactions of Hot Tritium Atoms with Amino Acids; Reactions entre Atomes Chauds de Tritium et Acides Amines; Reaktsii goryachikh atomov tritiya s aminokislotami; Reacciones de Atomos de Tritio Calientes con Aminoacidos}
author = {Simonov, E. F., and Nesmejanov, An. N.}
abstractNote = {In the existing literature there is a lack of systematic data on the interaction of tritium recoil atoms with amino acids, yet such data, in conjunction with results already obtained for organic acids and amines, could help in determining the mechanism of hot reactions in relation to the structure of compounds (chain length, functional substitutes). A study was made of the yields from the reaction of hot tritium atoms: (1) with amino acids having lengthened chains, and (2) with amino acids having a carbon chain of constant length, but with various functional substitutes. For this purpose mixtures of lithium carbonate and the acids under study were irradiated for 15 min with a slow neutron flux of 0.87 x 10{sup 13} cm{sup 2}/s. Analysis was carried out on a gas chromatography unit with interchangeable columns (molecular sieves, and liquid petrolatum on kieselguhr) and with paper chromatography. Although the data obtained for the radiation survival capacity of amino acids as a function of carbon chain length were at variance with a basic tenet of radiation chemistry according to which the conservation of molecules increases in proportion to the length of their chains, the data can be explained in terms of an intramolecular transfer of energy along the carbon chain from the collision site of the hot atom to the hydroxyl group, and subsequent ''de-excitation''; on the other hand, although the energy, of tritium recoil atoms is greater than that of the chemical bond, the latter nevertheless exerts an influence on the radiation conservation of molecules with a carbon chain of constant length but with various substitutes. (author) [French] Les etudes publiees jusqu'a present ne contiennent guere de renseignements systematiques sur les interactions entre atomes de tritium de recul et acides amines. Pourtant, ces donnees, completees par celles dont on dispose sur les acides organiques et les amines, pourraient aider a definir le mecanisme des reactions chaudes en fonction de la structure des composes (longueur de la chaine, groupes de substitution fonctionnels). Les auteurs ont etudie le rendement des reactions entre atomes chauds de tritium et acides amines: 1. lorsque la chaine des acides amines s'allonge; 2. lorsque les acides amines ont une chaine carbonee de longueur identique mais possedent des groupes de substitution fonctionnels differents. A cette fin, ils ont irradie des melanges de carbonate de lithium et d'acides a etudier dans un flux de neutrons lents de 0,87 * 10{sup 13}n/cm{sup 2} * s, pendant 15 min. L'analyse a ete faite au moyen d'un appareil de chromatographie gazeuse sur colonne a supports interchangeables (tamis moleculaires, huile de vaseline sur terre d'infusoires) et par chromatographie sur papier. Les donnees obtenues sur la survie a l'irradiation des acides amines en fonction de la longueur de la chaine carbonee semblent contredire une regle fondamentale de radiochimie, selon laquelle la duree de conservation des molecules augmente avec l'allongement de leur chaine, mais elles peuvent s'expliquer par un transfert intramoleculaire de l'excedent d'energie le long de la chaine carbonee - du point d'impact de l'atome chaud au groupe hydroxyle - et la dissipation consecutive de cet excedent; en revanche, bien que l'energie des atomes de tritium de recul depasse l'energie de liaison chimique, cette derniere agit malgre tout sur la conservation des molecules qui ont une chaine carbonee de meme longueur, mais possedent des groupes de substitution differents. (author) [Spanish] Las obras publicadas hasta la fecha no contienen datos sistematicos sobre la interaccion de los atomos de retroceso de tritio con aminoacidos. Tales datos, en conjuncion con los resultados obtenidos para los acidos organicos y las aminas, podrian ayudar a establecer el mecanismo de las reacciones de atomos calientes referido a la estructura de los compuestos (longitud de la cadena, naturaleza de los grupos funcionales). Los autores investigaron los rendimientos de las reacciones de los atomos calientes de tritio: a) con aminoacidos, de longitud de cadena creciente; b) con aminoacidos de longitud de cadena constante, pero que contenian distintos grupos funcionales. Con esta finalidad irradiaron durante 15 min, con un flujo de 0,87 * 10{sup 13} neutrones lentos/cm{sup 2} * s, mezclas de carbonato de litio con los aminoacidos que se querian estudiar. Efectuaron los analisis cromato- graficos en fase gaseosa con ayuda de columnas intercambiables (tamices moleculares, parafina liquida en diatomeas) asi como por cromatografia sobre papel. Los datos obtenidos acerca de la resistencia a la radiolisis de los aminoacidos en funcion de la longitud de la cadena carbonada, aunque esten en contradiccion con una de las reglas fundamentales de la radioquimica, a saber, que la resistencia de las moleculas aumenta con el aumento de la longitud de su cadena, pueden explicarse por la transferencia intramolecular de energia a lo largo de la cadena carbonada, desde el lugar de impacto del atomo caliente al grupo oxidrilo y su subsiguiente ''desexcitacion''. En cambio, si bien la energia de los atomos de retroceso del tritio es mayor que la energia de enlace quimico, esta ultima influye en la resistencia a la radiolisis de las moleculas cuya longitud de cadena es la misma, pero que contienen distintos grupos funcionales. (author) [Russian] V literature v nastojashhee vremja otsutstvujut sistematicheskie dannye o vzaimodejstvii atomov otdachi tritija s aminokislotami. V to zhe vremja, takie dannye v sochetanii s imejushhimisja rezul'tatami dlja organicheskih kislot i aminov mogli by pomoch' ustanovit' mehanizm gorjachih reakcij, v zavisimosti ot struktury soedinenij (dlina cepi, funkcional'nye zamestiteli). Byli issledovany vyhody reakcii gorjachih atomov tritija: 1) s aminokislotami pri uvelichenii dliny cepi poslednih, 2) s aminokislotami odnoj dliny uglerodnoj cepi, no raznymi funkcional'nymi zamestiteljami. Dlja jetoj celi smesi karbonata litija s issleduemymi kislotami byli oblucheny potokom medlennyh nejtronov 0,87 * 10{sup 13} cm{sup 2}/sek v techenie 15 minut. Analiz provodilsja na gazovom hromatografe so smennymi kolonkami (molekuljarnye sita, vazelinovoe maslo na diatomite) i s pomoshh'ju bumazhnoj hromatografii. Poluchennye dannye dlja radiacionnoj vyzhivaemosti aminokislot v zavisimosti ot dliny uglerodnoj cepi, hotja i protivorechat osnovnomu polozheniju radiacionnoj himii, soglasno kotoromu sohranenie molekul vozrastaet s udlineniem ih cepi, mogut byt' ob'jasneny vnutrimolekuljarnoj peredachej jenergii po uglerodnoj cepi ot mesta udara gorjachego atoma k gidroksil'noj gruppe i posledujushhim ee {sup v}ysvechivaniem{sup ,} s drugoj storony, hotja jenergija atomov otdachi tritija prevoshodit jenergiju himicheskoj svjazi, poslednjaja vse-taki okazyvaet svoe vlijanie na radiacionnoe sohranenie molekul odnoj dliny uglerodnoj cepi, no s raznymi zamestiteljami. (author)}
place = {IAEA}
year = {1965}
month = {Apr}
}