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MICROBIAL WALL [2 records]

Record 1 2003-12-10

English

Subject field(s)
  • Biological Sciences
  • Xylology (The Study of Wood)
  • Pulp Preparation (papermaking)
DEF

Complex oxygen-containing organic substance that, with cellulose, forms the chief constituent of wood. It is the second only to cellulose as the most abundant organic material on Earth, though very little of it has found any application other than as a fuel. It is a mixture of complex, apparently polymeric compounds of poorly known structure.

CONT

The lignin molecules are probably linked covalently to polysaccharides of the cell wall matrix. The separation of lignin from other constituents(cellulose and hemicellulose) is a major problem that prevents the easy use of the very large amounts of agricultural and forestry wastes, which are generally available at low cost, as substrates for microbial growth.

French

Domaine(s)
  • Sciences biologiques
  • Xylologie (Étude des bois)
  • Préparation de la pâte à papier
DEF

Macromolécule réticulée complexe qui résulte de l'association de différents monomères de type phénylpropane, par exemple l'alcool coniférylique. C'est le constituant fondamental du bois.

CONT

La lignine est un polymère «retors», résistant aux dégradations enzymatiques. Mais elle est avec la cellulose, la plus abondante source de matière première. La dégrader pour en faire un substrat adapté à la production de biocarburants par fermentation est un des buts des recherches actuelles.

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
  • Xilología (Estudio de la madera)
  • Preparación de la pasta (fabricación de papel)
DEF

Componente de la madera más abundante después de la celulosa, localizado principalmente en la laminilla media.

Save record 1

Record 2 2001-07-06

English

Subject field(s)
  • Spacecraft
  • Research Experiments in Space
CONT

Surface samples were collected from three locations in the Shuttle before and after each mission, including the vent above the waste control system in the middeck, the left most air-return in the port side crawl-through, and the air vent for the Commander's chair in the flight deck. In flight surface samples were collected using the Surface Sampler Kit from the same three locations in the Shuttle and five locations in the Mir, including the Commander's seat, the dining table, Commander's cabin, the treadmill handle, and the wall above the Kristall Module hatch. Samples were then incubated for five days and examined for microbial growth on the second and fifth days.

OBS

surface sampler kit; SSK: term and abbreviation officially approved by the International Space Station official approval Group (ISSOAG).

French

Domaine(s)
  • Engins spatiaux
  • Travaux de recherche dans l'espace
OBS

trousse d'échantillonnage de microbiologie de surface; SSK : terme et abréviation uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Spanish

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