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GRADIENT ANALYSIS [9 records]

Record 1 2013-09-25

English

Subject field(s)
  • Biochemistry
CONT

Examination of whole cell lipid profiles for PM1 [Methylibium petroleiphilum strain] and YM1 [Bacillus sp. strain] indicates that they are not identical strains. Thermal gradient gel electrophoresis(TGGE) analysis of 16S rRNA gene fragments from the two strains, however, showed no difference between them. 16S rDNA sequence analysis of strains PM1 and YM1 revealed that they are both most closely related to the genus Sphingomonas.

French

Domaine(s)
  • Biochimie
CONT

L'analyse de fragments obtenus après digestion de l'ADN ribosomal amplifié par des enzymes de restriction (ARDRA, amplified ribosomal DNA restriction analysis), la séparation des fragments amplifiés par électrophorèse sur gel avec gradient de dénaturation (DGGE, TGGE: thermal gradient gel electrophoresis) permettent de caractériser les communautés microbiennes par leur signature moléculaire.

OBS

TGGE est le sigle anglais.

Spanish

Campo(s) temático(s)
  • Bioquímica
DEF

Método para separar fragmentos de ADN según su movilidad bajo condiciones que favorecen progresivamente la desnaturalización por calor.

Save record 1

Record 2 2013-01-15

English

Subject field(s)
  • Analytical Chemistry
CONT

A gradient method is recommended for samples that cannot be easily separated by isocratic methods because of their wide k range. In gradient elution the eluent strength is increased during the separation by changing the composition of the mobile phase. As a result, the analysis time is reduced and the quality of the separation is improved as well as the detection limit.

French

Domaine(s)
  • Chimie analytique
CONT

La technique du gradient d'élution permet souvent de séparer des solutés qui ne pourraient pas l'être par la méthode isocratique, même avec un mélange de solvants; elle est particulièrement efficace quand les constituants de l'échantillon sont de polarités très différentes.

Spanish

Campo(s) temático(s)
  • Química analítica
Save record 2

Record 3 2010-05-13

English

Subject field(s)
  • Engineering Tests and Reliability
  • Technical Textiles
  • Soil Mechanics (Engineering)
CONT

Calhoun performed clogging tests to determine the degree of fabric clogging that might be experienced by fabric in contact with a gap-graded soil. The clogging test employed a permeameter device... Hydraulic gradient data from the soil-fabric permeameters were analyzed to determine the clogging potential of a fabric. The analysis made use of a ratio of the hydraulic gradient across the fabric plus an adjacent 1 in. of soil to the hydraulic gradient for the entire system, that is, the "clogging ratio. "A clogging ratio greater than 1 signifies fabric clogging.

OBS

clogging: the reduction of geotextile permeability occurring when fine grained material becomes trapped in or on the geotextile.

French

Domaine(s)
  • Fiabilité, contrôle et essais (Ingénierie)
  • Textiles techniques
  • Mécanique des sols
OBS

Sur le plan hydraulique, c'est surtout la permittivité (perméabilité dans le plan perpendiculaire au géotextile) et la résistance au colmatage qui sont déterminantes. Il est en particulier indésirable que de l'eau stagne au bas de la couche d'apport.

OBS

L'eau qui circule est chargée de particules solides en suspension, celles-ci s'accumulent sur le filtre ou au sein du filtre en réduisant progressivement la perméabilité. Le débit diminue, il y a colmatage [...] Pour éviter le colmatage du filtre, on pourrait choisir un géotextile dont la texture serait plus serrée que le diamètre des particules fines, mais elle serait quasi imperméable et arrêterait même l'eau.

Spanish

Save record 3

Record 4 2005-07-27

English

Subject field(s)
  • Modelling (Mathematics)
  • Atmospheric Physics
DEF

Model atmosphere in which the isosteric or isopycnic surfaces intersect the isobaric surfaces.

CONT

In weather analysis, a baroclinic atmosphere exists when isotherms exist in an isobaric surface analysis. In a baroclinic atmosphere, there is a horizontal temperature gradient and variation with height of the geostrophic wind(thermal wind).

French

Domaine(s)
  • Modélisation (Mathématique)
  • Physique de l'atmosphère
DEF

Modèle d'atmosphère dans lequel les surfaces isostères ou isopycnes ne coïncident pas avec les surfaces isobares.

Spanish

Campo(s) temático(s)
  • Modelización (Matemáticas)
  • Física de la atmósfera
DEF

Modelo de atmósfera en que las superficies isostéricas o isopícnicas se cruzan con las isobáricas.

Save record 4

Record 5 1997-10-22

English

Subject field(s)
  • Environmental Studies and Analyses
CONT

Gradient analysis includes four types of techniques that assist interpretation of species-gradient relationships :... regression and calibration(univariate approaches; one response variable), and ordination and constrained ordination(multivariate techniques; many response variables).

French

Domaine(s)
  • Études et analyses environnementales
CONT

Analyse numérique des complexes de données écologiques : calcul matriciel, analyse dimensionnelle, données multidimensionnelles quantitatives, semi-quantitatives et qualitatives, mesure de la ressemblance, groupement, ordination en espace réduit, interprétation des structures écologiques, séries, processus de Markov et matrice de Leslie.

Spanish

Save record 5

Record 6 1996-02-15

English

Subject field(s)
  • Analytical Chemistry
CONT

Often, all substances are not eluted from the column with a single solvent. After elution of part of the solutes, a different solvent or solvent mixture is added that shows a greater eluting power for the remaining solutes. In solvent gradient analysis, mixed solvents are used, but their volume ratios are varied continuously throughout the elution, usually in a linear fashion.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 6

Record 7 1996-02-15

English

Subject field(s)
  • Analytical Chemistry
CONT

Often, all substances are not eluted from the column with a single solvent. After elution of part of the solutes, a different solvent or solvent mixture is added that shows a greater eluting power for the remaining solutes... a concentrated salt or other reagent in the eluting solvent may be continuously diluted, as in salt gradient analysis. The salt may act as a salting-out agent(precipitating) for the solutes, and the salting-out ability decreases continuously.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 7

Record 8 1978-06-08

English

Subject field(s)
  • Microbiology and Parasitology
OBS

Methods for microbiological analysis of waters. Sloppy agar tubes provide a natural oxygen gradient and the bacteria appear as a thin, sharply-defined band of opaque white material.

French

Domaine(s)
  • Microbiologie et parasitologie
OBS

Cette gélose renfermant 5 à 6 fois moins d'agar que la gélose nutritive classique, est utilisée pour l'étude de la mobilité des bactéries.

Spanish

Save record 8

Record 9 1978-06-05

English

Subject field(s)
  • Microbiology and Parasitology
OBS

A few crystals or [micro liter] of liquid compound can be placed directly on the agar surface. As the compound diffuses, a concentration gradient is automatically established. No 1202276. Methods for micro-biological analysis of waters...

French

Domaine(s)
  • Microbiologie et parasitologie
OBS

Basée sur le fait qu'un antibiotique déposé sur une gélose nutritive ensemencée va diffuser suivant un gradient de concentration.

Spanish

Save record 9

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