摘要:
Méthode pour le diagnostic de l'état diazotrophe de sols arables et de préconisation de la fertilisation de la culture en cours comportant ; qu'un seul relevé automnal de la teneur en azote minérale (Nm) des sols en surface par échantillonnage du sol, donc sans avoir à prélever pour analyse l'ensemble de la zone d'enracinement et/ou de la zone vadose ; un indice intégral constitué d'une somme numérique révélatrice de l'incidence d'unités de temps post - enfouissement des résidus culture cellulosique au sol (RCsol) plus, ou moins, favorables, selon le cas, à un maximum d'activité diazotrophe (Nif) des bactéries du sol ; une préconisation concernant le rationnement de la dose X (dX) préalablement calculée.
et quatre étapes ; (ix) détermination de la météorologie affectant la cinétique des concentration de l'Nm dans la tranche supérieure de la zone vadose du sol par génération de la pluviométrie à partir de moyennes climatiques mensuelles, (x) suivi de la milli - molarité (mM) en Nm de la solution du sol à travers le temps, avantageusement suivant l'enfouissement des RCsol en fonction du nombre de jours post-enfouissement (jpe), (xi) quantification de la rétroaction négative par Nm de la diazotrophie (Nif) de la flore bactérienne du sol par rapport à son activité maximale fonction de la susdite mM d'Nm de la solution du sol, et (xii) intégration à travers le temps (jpe) de la fraction de l'activité diazotrophique (Nif) de la flore bactérienne du sol par rapport à son maximum lorsque la mM de l'Nm de la solution du sol ≈ 0,00.
摘要:
The present invention provides a method which is specific to determining and is capable of enumerating Escherichia coli ( E. coli ) in a sample water or sewage specimen. The method comprises adding to a cultured specimen a chromogenic reagent which when subjected to in situ E. coli β-glucuronidase activity produces clearly defined vivid colourization of any individual colonies deriver from E. coli cells in the test specimen.
摘要:
The present invention provides a method which is specific to determining and is capable of enumerating Escherichia coli ( E. coli ) in a sample water or sewage specimen. The method comprises adding to a cultured specimen a chromogenic reagent which when subjected to in situ E. coli β-glucuronidase activity produces clearly defined vivid colourization of any individual colonies deriver from E. coli cells in the test specimen.
摘要:
A chromogenic substrate, such as an 8-hydroxyquinoline or 8-amino quinoline derivative, is enzymically cleaved by an enzyme of the microorganism to be identified. A chromogenic moiety is released, such as 8-hydroxyquinoline or 8-amino quinoline, and forms an insoluble coloured complex with metal ions present When microorganisms are cultured on plates of nutrient material in the presence of such a chromogenic substrate and chelatable metal ions and the coloured complex is deposited intra or pericellularly and discrete areas of colour are produced.
摘要:
A microbiological culture test process for detecting the presence of nitrate-reducing microorganism in an inoculum sample, which comprises
(a) culturing a microorganism to be tested in the presence of adequately nitrite-free nitrate, for a period sufficient to allow reduction of nitrate by any microorganism (if present) that has the capacity to reduce nitrate to nitrite, (e.g. 1-6 hours); (b) exposing the culture medium after culture to (diazotising) acid conditions in the presence of an amino-containing fluorophor thereby to cause diazotisation of the fluorophor to the extent of any nitrite present in the medium to form a diazonium derivative (or further reaction product thereof) which is substantially less fluorescent (or fluoresces at a substantially different wavelength) than said amino-containing fluorophor, and (c) assessing the fluorescence of the culture medium as treated by step (b), thereby to show a reduction in fluorescence in the presence of a nitrate-reducing microorganism.
摘要:
Chromogenic substrate member for identifying Escherichia coli bacteria. It comprises a growing medium for said bacteria and container means (1) for the growing medium (4) and a liquid sample to be tested. The container means also contains a chromogenic reagent compound consisting in 8-hydroxyquinoline-β-D glucuronide and an activator compound consisting in X-glucuronide where X is selected from the group consisting in alkyl, aryl or indoxyl radical, the halogeno substitutes and the nitro substitutes thereof.