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TRACE SPECIES [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-02-03

English

Subject field(s)
  • Federal Government Bodies and Committees (Canadian)
  • Oceanography
OBS

Environment Canada.

OBS

... conducted studies of trace metal abundances, organic chemical species and of conventional chemicals in the Gulf.

French

Domaine(s)
  • Organismes et comités fédéraux (Gouvernement canadien)
  • Océanographie
OBS

Environnement Canada.

OBS

[...] a entrepris des études sur les quantités d'oligométaux, les espèces chimio-organiques et les produits chimiques classiques présents dans le golfe.

Spanish

Save record 1

Record 2 2010-04-09

English

Subject field(s)
  • Biochemistry
CONT

The quantitative aspects of elemental electrospray mass spectrometry are investigated with particular emphasis on the factors affecting the ability to establish linear calibration curves. It is shown that linear calibration curves can be obtained for trace elements if the analyte signal is ratioed to the signal from a constant amount of a similarly charged electrolyte species. Linear calibration curves can be established over a concentration dynamic range of at least 4 orders of magnitude. The added component seems to function as a stabilizer and monitor of the electrospray process and as an internal standard. In certain cases species generated by acidification of the solvent may be used as electrospray stabilizers.

French

Domaine(s)
  • Biochimie
CONT

L'électronébulisation, connue sous le nom d'electrospray (ES), génère des ions multichargés , et permet l'utilisation d'analyseurs conventionnels peu onéreux comme les quadripôles. En effet, comme ce sont les rapports masse/charge qui sont mesurés par cette méthode, une protéine de masse 100 000 peut donner des ions 100 fois chargés apparaissant sur le spectre de masse au rapport masse/charge 1000.

Spanish

Save record 2

Record 3 2004-10-01

English

Subject field(s)
  • Chemical Elements and Compounds
  • Pollutants
CONT

... important trace species can be continuously measured..., such as NO, NH3, HCHO, BTEX(benzene, toluene ethyl benzene and xylenes) and other monocyclic aromatic hydrocarbons(MAH).

French

Domaine(s)
  • Éléments et composés chimiques
  • Agents de pollution
CONT

Les BTX (appellation regroupant le benzène, le toluène et les xylènes) sont des hydrocarbures aromatiques monocycliques (HAM) constitués d'un seul cycle benzénique. Les BTX entrent dans la composition des carburants et se retrouvent dans l'atmosphère soit par les gaz d'échappement, soit par l'évaporation des carburants des réservoirs ou des stations services.

Spanish

Save record 3

Record 4 1998-01-27

English

Subject field(s)
  • Titles of International Programs
  • Environmental Economics
  • Climate Change
  • Air Pollution
OBS

of the International Geosphere-Biosphere Program.

French

Domaine(s)
  • Titres de programmes internationaux
  • Économie environnementale
  • Changements climatiques
  • Pollution de l'air

Spanish

Save record 4

Record 5 1990-03-14

English

Subject field(s)
  • Chemistry
CONT

This research is intended to provide a better understanding of the complex interaction of trace species both in the troposphere and stratosphere. Studies being, or soon to be supported include :... Studies of the reactions of free radical species remaining after the initial chlorine radical is removed from chlorofluorocarbons 11 and 12, including studies of the behaviour of COCl2, COF2 and COF2 and COFCl.

French

Domaine(s)
  • Chimie
DEF

Famille de radicaux libres, qui contiennent au moins un atome de chlore, très importante dans le processus de destruction de l'ozone.

OBS

Les radicaux libres C1 et C10 sont les deux principaux membres de cette famille.

OBS

Un radical libre s'indique par un point à droite au symbole chimique.

Spanish

Save record 5

Record 6 1988-03-31

English

Subject field(s)
  • Air Pollution
OBS

Ozone layer protection.

French

Domaine(s)
  • Pollution de l'air
OBS

Protection de la couche d'ozone.

Spanish

Save record 6

Record 7 1977-03-22

English

Subject field(s)
  • Paleontology
OBS

[Trilobite] larval stage(...) [which] begins when the first trace of a pygidium develops.(...) there is an increase in thoracic segments until the number equals that belonging to the adult of the concerned species, and each molt is accompanied by an increase in size.

French

Domaine(s)
  • Paléontologie
OBS

(...) stade larvaire [du trilobite] (...) caractérisée par la formation d'une articulation entre le céphalon et le pygidium puis, tandis que de nouveaux anneaux se forment en avant de la pièce terminale, ou teison, le pygidium émet progressivement en avant de soi les différents anneaux du thorax.

Spanish

Save record 7

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