TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

CATION [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2002-03-28

English

Subject field(s)
  • Biological Sciences
DEF

Atom of metal which has lost one or more electrons and therefore has a positive electrical charge. Table salt (sodium chloride) contains sodium ion, for instance.

CONT

Some enzymes depend for activity only on their structure as proteins, while others also require one or more nonprotein components, called cofactors. The cofactor may be a metal ion.... In such enzymes the metal ion may serve as (1) the primary catalytic center; (2) a bridging group, to bind substrate and enzyme together through formation of a coordination complex; or (3) an agent stabilizing the conformation of the enzyme protein in its catalytically active form. Enzymes requiring metal ions are sometimes called metalloenzymes.

OBS

The metal ions most frequently used as enzyme activators are magnesium, manganese, zinc, potassium, iron, copper, calcium, cobalt, and molybdenum.

French

Domaine(s)
  • Sciences biologiques
DEF

Atome de métal qui a perdu un ou plusieurs électrons, il possède donc une charge positive.

CONT

De nombreuses protéines présentent un niveau de structure supplémentaire, après la structure tertiaire : certaines sont composées de plusieurs chaînes polypeptidiques reliées entre elles par diverses liaisons faibles et parfois par des ponts disulfure; d'autres comportent des constituants non peptidiques : les ions métalliques, par exemple, sont indispensables à l'activité de certaines enzymes, et l'hémoglobine, la chlorophylle et un grand nombre d'autres protéines renferment par exemple un groupe chimique appelé porphyrine.

OBS

Toutes les enzymes dont le cofacteur est un ion métallique seront sensibles aux agents couplexant les métaux tel l'EDTA

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
Save record 1

Record 2 1999-04-12

English

Subject field(s)
  • Analytical Chemistry
DEF

In mass spectrometry, ... an atom, radical, molecule or molecular moiety which has lost one or more electrons thereby attaining an electrically positive charge.

OBS

The use of the terms cation and mass ion as alternatives are not recommended.

French

Domaine(s)
  • Chimie analytique
CONT

Les analytes, sous forme moléculaire, peuvent être retenus par effet hydrophobe sur un copolymère styrène-divinylbenzène PRP-1, alors que les cations inorganiques, très hydrophiles, ne le sont pas.

PHR

Ion positif inorganique.

Spanish

Save record 2

Record 3 1999-03-23

English

Subject field(s)
  • Electrochemistry
  • Electrometallurgy
  • Petrochemistry
DEF

A positively charged ion. [Definition standardized by ISO.]

OBS

Positively charged ions are cations, and negatively charged ions are anions.

OBS

cation: term standardized by ISO.

French

Domaine(s)
  • Électrochimie
  • Électrométallurgie
  • Chimie du pétrole
DEF

Ion chargé positivement. [Définition normalisée par l'ISO.]

OBS

cation : terme normalisé par l'ISO.

Spanish

Campo(s) temático(s)
  • Electroquímica
  • Electrometalurgia
  • Petroquímica
DEF

Ión de carga positiva, que en la electrólisis se dirige al cátodo o electrodo negativo.

Save record 3

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