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MICROGRAM [9 records]

Record 1 2017-05-09

English

Subject field(s)
  • Biochemistry
  • Food Industries
  • Dietetics
DEF

A unit of measurement of the vitamin A content of a food.

OBS

One RAE equals 1 microgram of retinol.

French

Domaine(s)
  • Biochimie
  • Industrie de l'alimentation
  • Diététique
CONT

La dose de vitamine A est exprimée en microgramme et en équivalent d'activité du rétinol (EAR).

Spanish

Save record 1

Record 2 2013-03-21

English

Subject field(s)
  • Toxicology
  • The Skin
  • Occupational Health and Safety
CONT

Only one class of easily produced toxins, the trichothecene mycotoxins, is dermally active.... They can cause skin lesions and systemic illness without being inhaled and absorbed through the respiratory system.... Nanogram(one billionth of a gram) quantities per square centimeter of skin cause irritation, and microgram(one millionth of a gram) quantities cause necrosis(destruction of skin cells).

French

Domaine(s)
  • Toxicologie
  • Appareil cutané
  • Santé et sécurité au travail

Spanish

Save record 2

Record 3 2012-07-30

English

Subject field(s)
  • Metrology and Units of Measure
  • Analytical Chemistry
  • Environmental Studies and Analyses
CONT

The concentration of a contaminant refers to its quantity in the air. For gaseous contaminants, the concentration is expressed as a ratio of the volume of contaminants present in one billion volumes of air, or ppb. A similar unit is the parts per ten million, or pptm. One pptm consists of 100 ppb. For particulates, the concentration is expressed as a ratio of the mass of the particulates present in one cubic metre(m³) of air. The unit used for the mass is the microgram²(or µg), so the concentration is expressed in units of mg/m.

CONT

Carbon monoxide concentrations are in units of parts per ten million (pptm).

Key term(s)
  • parts per ten million
  • part per ten millions
  • parts per ten millions

French

Domaine(s)
  • Unités de mesure et métrologie
  • Chimie analytique
  • Études et analyses environnementales
CONT

L'action de ce gaz est telle qu'il en suffit d'une partie par dix millions de parties d'air pour mettre un homme hors de combat dans l'espace d'une minute.

Spanish

Save record 3

Record 4 2011-08-05

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)
HOC10H4(SO3H)2NNC6H4AsO3H2
formula, see observation
C10H13O10N2S2As
formula, see observation
DEF

A reagent for the colorimetric determination of microgram quantities of thorium.

OBS

Chemical formulas: HOC10H4(SO3H)2NNC6H4AsO3H2 or C10H13O10N2S2As

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)
HOC10H4(SO3H)2NNC6H4AsO3H2
formula, see observation
C10H13O10N2S2As
formula, see observation
DEF

Produit chimique se présentant sous la forme d'une poudre rouge, soluble dans l'eau, l'alcool, les alcalis, utilisé pour le dosage du thorium et comme réactif analytique.

OBS

Formules chimiques : HOC10H4(SO3H)2NNC6H4AsO3H2 ou C10H13O10N2S2As

Spanish

Save record 4

Record 5 2009-11-17

English

Subject field(s)
  • Biochemistry
  • Chemistry
  • Nuclear Physics
DEF

The branch of microchemistry dealing with minute quantities of material weighing one microgram or less.

OBS

Glenn T. Seaborg, discoverer of plutonium and nine other chemical elements. ... worked with him for 36 years, thanked him for developing the chemical separations process for plutonium and for mastering the exacting ultramicrochemistry techniques used in testing.

French

Domaine(s)
  • Biochimie
  • Chimie
  • Physique nucléaire
CONT

Pour appliquer à des quantités infimes de matière des méthodes de séparation dont les performances ont été déterminées sur des quantités pondérables d'éléments, Seaborg utilisa systématiquement ce que l'on nomme l'ultramicrochimie. C'est-à-dire l'exécution d'opérations chimiques sur des quantités très faibles mais à des concentrations analogues à celles utilisées pour les études des méthodes de séparation.

Spanish

Save record 5

Record 6 2006-01-05

English

Subject field(s)
  • Analytical Chemistry
DEF

Identification and chemical analysis of material on a small scale so that specialized instruments such as the microscope are needed; the material analyzed may be on the scale of 1 microgram.

French

Domaine(s)
  • Chimie analytique
OBS

Pluriel : des microanalyses.

OBS

microanalyse : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).

Spanish

Campo(s) temático(s)
  • Química analítica
Save record 6

Record 7 2004-09-16

English

Subject field(s)
  • Metrology and Units of Measure
  • Nutritive Elements (Biological Sciences)
DEF

Used as a measure of the comparative potency of natural substances, such as vitamins, before they are obtained in sufficiently pure form to measure by weight. An international unit(i. u.) is arbitrarily defined in terms of a reproducible standard, e. g./i. u. of vitamin A was originally microgram of the purest then known preparation of carotene, later o. 6 microgram of beta-carotene.

French

Domaine(s)
  • Unités de mesure et métrologie
  • Éléments nutritifs (Sciences biologiques)
OBS

L'unité internationale de vitamine A correspond à l'activité de 0.344g d'acétate de vitamine A. Les besoins quotidiens sont de 30 à 100 U.I. par kilo de poids corporel soit 5000 U.I. pour un homme normal.

Spanish

Campo(s) temático(s)
  • Metrología y unidades de medida
  • Elementos nutritivos (Ciencias biológicas)
Save record 7

Record 8 1997-07-10

English

Subject field(s)
  • Lichens
CONT

The sensitivity of lichens to sulphur dioxide is well known and Hawksworth et al. have attributed changes in lichen flora to this pollutant. Where the winter SO2 levels are [less than] 30 [microgram]/m3, lichen floras are almost identical to late 19th century floras.

French

Domaine(s)
  • Lichens
CONT

Dans une étude préliminaire nous nous sommes donnés comme objectifs : - de cartographier la pollution acide dans la région lyonnaise à partir de l'observation des espèces lichéniques [...] - de discuter de l'influence des facteurs climatiques sur la propagation et l'extension de cette pollution et de la flore lichénique.

Spanish

Save record 8

Record 9 1986-09-25

English

Subject field(s)
  • Environmental Studies and Analyses
  • Air Pollution
  • Concrete Facilities and Equipment
CONT

The Hot-Mix Paving Industry... Stone dust ranges in size from 0. 1 [microgram] to more than 300 [micrograms]. The amount of dryer dust depends upon the dryer design and operation, and the aggregate makeup. Studies in the Los Angeles area have shown that, all other factors being the same, the amount of dryer dust increases linearly with the amount of mineral dust in the aggregate.

French

Domaine(s)
  • Études et analyses environnementales
  • Pollution de l'air
  • Outillage et installations (Bétonnage)

Spanish

Save record 9

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