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INORGANIC SOLUTES [4 records]

Record 1 2010-10-25

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Plant Biology
CONT

The leaf cells contain various organic and inorganic solutes, which determine the leaf osmotic potential(OP). OP is generally lower(more negative) than LWP [leaf water potential] and the difference between the two is turgor potential. Turgor is lost(null value) when LWP=OP... Leaf turgor is associated with cellular growth and function. When turgor becomes null cells collapse and the leaf wilts, though it is not dead. Stomata are responsive(among other factors) to turgor, closing to reduce transpiration.

CONT

Figures 2 and 3 show average leaf water potential and osmotic potential, respectively, of the five cultivars. Turgor potential can be estimated by subtracting osmotic potential from leaf water potential.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Biologie végétale
CONT

Certains polluants, comme le SO2 affectent de façon sélective les cellules péristomatiques sans perturber les cellules de garde. Ceci explique en partie pourquoi ces polluants provoquent d'abord une ouverture stomatique : les cellules péristomatiques abimées souffrent probablement d'une réduction de leur potentiel de turgescence et opposent ainsi une résistance mécanique aux cellules de garde moins importante que si elles étaient en bon état,

CONT

Les mesures des potentiels hydriques [(psi exposant H]) et osmotiques [(pi]) sont effectuées avec un micropsychromètre (Wescor HR-33T) et des chambres isothermes C52. Le potentiel de turgescence (P) est obtenu avec la relation [psi exposant H] = [pi] + P.

Spanish

Campo(s) temático(s)
  • Medición y análisis (Ciencias)
  • Biología vegetal
Save record 1

Record 2 2003-12-17

English

Subject field(s)
  • Water Pollution
DEF

Adherent inorganic deposit formed on surfaces by water which has become supersaturated with respect to one or more solutes, or destabilized by loss of carbon dioxide, for example, by boiling.

OBS

Term and definition standardized by ISO.

French

Domaine(s)
  • Pollution de l'eau
DEF

Dépôt inorganique formé sur les surfaces par l'eau qui est sursaturée avec un ou plusieurs soluté(s), ou déstabilisée par la perte de dioxyde de carbone, par exemple en la faisant bouillir.

OBS

dépôt en couches : Terme et définition normalisés par l'ISO.

Spanish

Campo(s) temático(s)
  • Contaminación del agua
Save record 2

Record 3 2002-11-08

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Plant Biology
CONT

The total water potential, which describes the energy of the water contained in the plant can be estimated from leaf water potential (LWP) measurements, by the use of the pressure bomb in salinity studies. The major components of LWP are leaf osmotic potential (LOP) and leaf turgor potential (LTP). Leaf water potential and leaf osmotic potential can be measured directly by the use of the pressure bomb and the vapor pressure osmometer, respectively. The LTP can be estimated by the equation LTP = LWP - LOP.

CONT

Leaf water potential and leaf osmotic potential were measured on the same leaves. Both parameters were measured on leaf discs by the thermocouple psychrometric method ... The osmotic potential was measured after the sample (leaf disc) had been frozen over dry ice, thawed, and macerated with a small glass rod. The sap extract was then immediately placed on a filter paper disc in the C-52 sample chamber and its value of osmotic potential determined (Turner, 1981).

CONT

The leaf cells contain various organic and inorganic solutes, which determine the leaf osmotic potential(OP). OP is generally lower(more negative) than LWP and the difference between the two is turgor potential. Turgor is lost(null value) when LWP=OP...

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Biologie végétale
OBS

Le potentiel hydrique foliaire [(psi)] a été mesuré par la méthode de la chambre de pression mise au point par Scholander et al. Il correspond à la pression de l'air exercée sur la feuille et affichée par le manomètre de la chambre en acier, qui permet la sortie d'une petite goutte d'eau du pétiole. Le potentiel osmotique [(pi)] a été mesuré sur la feuille entière de la plante à la huitième semaine de croissance. La feuille récoltée était rapidement mise à congeler pendant 24 heures. Ensuite elle a été enfermée dans une enceinte en acier connectée à un psychromètre de type HR-33T Microvolt-meter.

Spanish

Campo(s) temático(s)
  • Medición y análisis (Ciencias)
  • Biología vegetal
Save record 3

Record 4 1983-03-15

English

Subject field(s)
  • Chemical Engineering

French

Domaine(s)
  • Génie chimique

Spanish

Save record 4

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