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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of industrial microbiology and biotechnology 18 (1997), S. 348-352 
    ISSN: 1476-5535
    Keywords: Keywords: slime production; Bacillus alvei; Aerobacter aerogenes; coated broke; white water; biocide (Bioplus®; levanase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bacteria, yeast and filamentous fungi were isolated from various sites within a paper mill. Bacillus alvei and Aerobacter aerogenes were the most prevalent contaminating bacteria. Maximum slime was produced by A. aerogenes (4.2 mg ml−1) at pH 6.5 and by B. alvei (7.2 mg ml−1) at pH 7.5 in white water. The optimum temperature was 40°C for maximum slime production by both organisms. In the presence of levanase, a 25% reduction in dosages of a biocide (Bioplus®) was observed. Killing of A. aerogenes, which was achieved in 8 h with 20 ppm Bioplus®, could be obtained in 6 h with the combined use of levanase and a lower concentration of Bioplus® (15 ppm). With B. alvei almost the same inhibitory effect (4.22-log decrease) was obtained at 20 ppm Bioplus®, and in combination with a lower concentration of Bioplus® (15 ppm) and enzyme. The paper properties did not show any adverse effect after treatment with levanase and Bioplus®.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 8 (1992), S. 212-213 
    ISSN: 1573-0972
    Keywords: Bacterial penetration ; Lactobacilli ; poultry meat ; Pseudomonads
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The penetration of poultry muscle strips byPseudomonas putida, P. fragi, Lactobacillus plantarum andL. casei was studied at 37°C. The first three bacteria penetrated along the muscular septa whileLactobacillus casei did not invade the poultry muscle strips at all. The penetration by both pseudomonads occurred throughout the 3 cm muscle strip butL. plantarum showed minor penetration up to 2 cm only.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 4 (1988), S. 431-437 
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé L'ajout d'ammoniaque de 0.134 à 0.67m à la viande moulue fait décroître le nombre total de bactéries aérobies et, dans une moindre mesure, de bactéries Gram-négatives, tant à 37°C qu'à 4°C et à −20°C. Le comptage sur boîte de Pétri au même pH, obtenu par ajustement au NaOH 1m, révèle des valeurs considérablement plus élevées que lorsque l'ammoniaque 0.4m est utilisé, indiquant par là que c'est bien l'ammoniaque qui agit en tant que préservatif pour la viande moulue et non le seul changement de pH. Les changements en volume d'extrait relâché, en capacité de rétention d'eau, en azote protéique soluble, sont bien moins prononcés dans le cas de la viande moulue contenant de l'ammoniaque que dans le contrôle sans préservatif ou contenant du NaOH.
    Abstract: Resumen La adición de hidróxido amónico a concentraciones de 0.134 a 0.67m disminuyó el número total de bacterias aerobias y en menor proporción la cantidad de bacterias gram negativas a 37°C, 4°C y a −20°C. El conteo efectuado a un mismo pH ajustado con NaOH 1m o bien con NH4OH 0.4m fue considerablemente superior en el primer caso, indicando que el efecto de NH4OH no era únicamente debido al cambio de pH sino que extracto liberado, en la capacidad de retención de agua, en las proteinas/nitrógeno soluble y las perdidas por cocción fueron menores en la carne picada que contenía NH4OH comparada con el control (sin preservativo) o con la que contenía NaOH.
    Notes: Summary Ammonium hydroxide when added at 0.134 to 0.67m to ground-meat, decreased the total number of aerobic bacteria and, to a lesser extent, Gram-negative bacteria at 37°C, 4°C and −20°C. The plate count at the same pH adjusted with 1m NaOH was considerably more than when 0.4m NH4OH had been used, indicating that NH4OH was acting as preservative for ground-meat and not the merely changing the pH. The changes in extract release volume, water holding capacity, soluble protein nitrogen and cook out losses were much less in ground meat containing NH4OH as compared to control (no preservative) or containing NaOH.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 5 (1989), S. 199-204 
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé Campylobacter jejuni pénètre les membranes externe, interne et finalement le contenu d'oeux félés davantage à 4°C (après équilibration à 42°C pendant 10 min.) qu'à 25 ou 42°C. Le nombre d'oeux montrant la pénétration parC. jejuni décroît avec le temps.
    Notes: Summary Campylobacter jejuni 79-193 penetrates the inner, outer membrane and ultimately the contents of cracked eggs more at 4°C (after equilibration at 42°C for 10 min) than at 42°C or 25°C. The number of eggs showing penetration byC. jejuni decreased with time.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 4 (1988), S. 333-337 
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé L'incidence de souches entéropathogènes d'Escherichia coli était plus élevée (33 à 50%) dans les saucisses de poulet cru que dans les saucisses de porc cru (10 à 43%). Les souches toxigènes d'E. coli isolées étaient en général de type sérologique O5 ou O89. Les tests du loop iléal et de la perméabilité de la peau de lapin ont démontré que la quantité de toxine produite variait dans les saucisses crues et bouillies. La production de toxine était invariablement plus élevée à 28 ou à 37°C qu'à 45°C tant dans les saucisses crues que dans les saucisses bouillies.
    Abstract: Resumen La incidencia de cepas enteropatógenas deEscherichia coli fue mayor (33 a 50%) en salsichas de pollo crudas que salsichas de cerdo. Los aislados toxinogénicos pertenecían en su mayoría a los serotipos O5 y O89 deE. coli. La variación en la cantidad de toxina producida entre salsichas crudas y hervidas se midió mediante pruebas de permeabilidad en asa ileal y piel de conejo. La producción de toxinas, tanto en salsichas crudas como hervidas, era mayor a 28°C o a 37°C que a 45°C.
    Notes: Summary The incidence of enteropathogenicEscherichia coli was higher (33 to 50%) in uncooked chicken sausages than in pork sausages (10 to 43%). The toxigenic isolates in general were of O5 and O89 sero types ofE. coli. The amount of toxin produced varied in raw and boiled sausages as tested by ileal loop and rabbit skin permeability tests. The toxin production was invariably higher at 28°C or 37°C in raw and boiled sausages than at 45°C.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 5 (1989), S. 511-516 
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé La résistance thermique de spores deBacilluscereus, exprimée par la grandeur D (l'expression du temps en minutes requis pour la destuction thermique d'une décade logarithmique de spores) dans les préparations de crème, décroît de 90 °C à 100 °C. Avec une augmentation de pH des préparations de crème de 6.2 à 7.2, la valeur D pour les spores deB. cereus augmente de 3.1 à 3.7 min. à 90 °C, de 2.5 à 3.0 min. à 95 °C et de 1.7 à 2.2 min. à 100 °C. Toutefois, la grandeur Z (le changement de température requis pour engendrer un changement d'un facteur 10 dans la valeur D) n'est pas affectée par ce changement de pH. Une diminution du nombre de spores deB. cereus chauffé est observée avec l'augmentation de la concentration du benzoate de soude, un agent antimicrobien, ainsi que de l'anisole hydroxy-butylé et du toluène hydroxybutylé, deux agents antioxidants.
    Notes: Summary The thermal resistance ofBacillus cereus spores expressed in terms ofD value (an expression of time in minutes required for the heat destruction of one log cycle of spores) in custard preparations decreased from 90°C to 100°C. With an increase in pH of custard preparations from 6.2 to 7.2, theD value ofB. cereus spores increased from 3.1 to 3.7 min at 90°C, from 2.5 to 3.0 min at 95°C and from 1.7 to 2.2 min at 100°C. However, theZ value (the change in temperature necessary to cause a tenfold change in theD value) remained unaffected by the change in pH. A decrease in the number of heatedB. cereus spores was observed with the increase in the concentration of the antimicrobial agent sodium benzoate and the antioxidants butylated hydroxyanisole and butylated hydroxytoluene.
    Type of Medium: Electronic Resource
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