Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Añadir filtros








Intervalo de año
1.
Rev. argent. microbiol ; 33(2): 59-64, abr.-jun. 2001.
Artículo en Español | LILACS | ID: lil-332500

RESUMEN

Degradation of yard wastes by Coprinus truncorum growing in a vertical aereated bioreactor or in flasks was studied. There was a constant decay of reducing sugars in the medium that avoided their accumulation and their possible repression of degradative enzymes. Endoxylanase activity at first showed a similar pattern in both culture conditions, with maximal activity on the 12th day, but flasks maintained a high activity thereafter. Flasks also showed a higher endoglucanase activity with a peak on the 18th day, whereas the maximal value in the bioreactor was reached on the 26th day. No Mn-peroxidase and only low values of laccase activity were found. The measurements of pH and soluble proteins during the incubation period were suitable indicators of the degradation process by C. truncorum.


Asunto(s)
Reactores Biológicos , Coprinus , Eliminación de Residuos/métodos , Micología , Plantas , Biodegradación Ambiental , Carbohidratos , Celulasa , Celulosa , Coprinus , Residuos de Alimentos , Concentración de Iones de Hidrógeno , Lignina , Oxidación-Reducción , Oxidorreductasas , Peroxidasas , Proteínas Fúngicas/metabolismo , Solubilidad , Temperatura , Xilosidasas
2.
Rev. argent. microbiol ; 32(1): 7-14, ene.-mar. 2000.
Artículo en Español | LILACS | ID: lil-332544

RESUMEN

Stereum hirsutum BAFC 2234 was tested for growth kinetics and ligninolytic enzyme production. The strain showed weak coincidences with widely studied organisms (Phanerochaete chrysosporium, Pleurotus ostreatus) when the response to nitrogen sources was assayed. This could be interpreted as a different regulation to nitrogen metabolism for S. hirsutum BAFC 2234. Alternative carbon sources and the addition of veratryl alcohol and wood extracts were also tested showing partial correspondence with other ligninolytic fungi. On the basis of the high enzymatic activities observed, S. hirsutum BAFC 2234 could be a suitable source of lignin degrading system aiming techological processes.


Asunto(s)
Basidiomycota , Lignina , Oxigenasas , Medios de Cultivo , Técnicas Microbiológicas , Nitrógeno/metabolismo
3.
Rev. argent. microbiol ; 27(3): 130-8, jul.-sept. 1995.
Artículo en Español | LILACS-Express | LILACS, BINACIS | ID: biblio-1171649

RESUMEN

Growth kinetic variables (dry weight, mycelial protein, extracellular protein and pH evolution) were measured in Ascobolus furfuraceus cultures either with soluble cellulose (CMC) or crystalline cellulose as only carbon sources. When growing on CMC the mycelial protein production reached a maximum at 14 days, while the extracellular protein was maximal at 17 days. On crystalline cellulose more delay was observed (4 and 14 days, respectively). Straight lineal correspondence (r = 0.9883) was observed between the extracellular protein production and enzymatic activity kinetics, showing parallel behavior of these variables. When the biomass and extracellular protein production rates were analysed, the maxima were observed at diverse growth stages. For CMC, the dry weight production rythm precedes the cellulolytic system liberation rythm (maxima at 9 and 14 days, respectively). When crystalline cellulose was the substrate, the maximal rates were inverse, 16th day for biomass production rythm and 12th day for enzyme release rythm. On the basis of such tests and analyses, a model to explain cellulose degration by A. furfuraceus, is proposed.

4.
Medicina (B.Aires) ; 54(5,pt.1): 385-91, sept.-oct. 1994. tab, graf
Artículo en Español | LILACS | ID: lil-147145

RESUMEN

Se estudió el efecto de la administración de aceite de maíz con la dieta sobre el metabolismo de los ácidos grasos esenciales (AGE) en lactantes normales y desnutridos alimentados solamente con leche de vaca desde el nacimiento. Se seleccionó también un grupo de lactantes alimentados con leche materna. Se usó como parámetro bioquímico para evaluar las condiciones en que se encontraban los AGE la composición en ácidos grasos de los fosfolípidos del plasma. Se observó un cuadro consistente con una carencia en AGE tanto en lactantes normales como desnutridos alimentados con leche de vaca, es decir, una disminución de la proporción de los ácidos grasos de la serie n6 y un aumento de los ácidos grasos saturados. Calculando la relación precursor-productos de los ácidos polietilénicos se observó una alteración del metabolismo del ácido linoleico. La administración del aceite de maíz restauró el perfil de los ácidos grasos a valores normales aun en los lactantes desnutridos a pesar de que el síndrome clínico de la desnutrición no había sido corregido


Asunto(s)
Recién Nacido , Lactante , Humanos , Masculino , Femenino , Ácidos Grasos Esenciales/metabolismo , Desnutrición Proteico-Calórica/metabolismo , Leche/química , Aceite de Maíz/metabolismo , Fosfolípidos/metabolismo , Ácidos Grasos Esenciales/sangre , Ácidos Linoleicos/metabolismo , Cromatografía de Gases , Alimentos Fortificados , Leche Humana/química , Aceite de Maíz/análisis , Fosfolípidos/sangre
5.
Rev. argent. microbiol ; 16(4): 177-86, 1984.
Artículo en Español | LILACS-Express | LILACS, BINACIS | ID: biblio-1171525

RESUMEN

The effect of various nitrogen sources on growth and efficiency parameters of Ascobolus furfuraceus was investigated. As nitrogen sources, sodium nitrate and nitrite, inorganic ammonium salts and nitrated organic compounds have been used. The results showed that all of them could be used by the fungus, with the exceptions of sodium nitrite and ammonium oxalate. Good correlation was observed among the growth parameters, the ’economic coefficients’ of uptake and internal conversion of sources, and the specific respiration rates. The best nitrogen source - estimated as growth and efficiency parameters - was ammonium carbonate in the culture conditions used. The possibility of heterotrophic carbon fixation is discussed.

6.
Rev. argent. microbiol ; 15(3): 177-80, 1983.
Artículo en Español | LILACS | ID: lil-16044

RESUMEN

La cinetica de incorporacion de glucosa por el micelio de Ascobolus furfuraceus de 13 dias de crecimiento y realimentado con glucosa o con medio fresco total, esta en correlacion con la diferenciacion progresiva de estructuras vesiculares que funcionarian como reservorio de glucogeno


Asunto(s)
Ascomicetos , Glucosa
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA