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Pesquisa : B01.650.940.800.575.137.500 [Categoria DeCS]
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Texto completo SciELO Chile
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Id: lil-774433
Autor: Zúñiga-González, Paz; Zúñiga, Gustavo E; Pizarro, Marisol; Casanova-Katny, Angélica.
Título: Soluble carbohydrate content variation in Sanionia uncinata and Polytrichastrum alpinum, two Antarctic mosses with contrasting desiccation capacities
Fonte: Biol. Res;49:1-9, 2016. ilus, graf.
Idioma: en.
Projeto: FONDECYT; . INACH FR; . FONDECYT.
Resumo: BACKGROUND: Cryptogamic vegetation dominates the ice-free areas along the Antarctic Peninsula. The two mosses Sanionia uncinata and Polytrichastrum alpinum inhabit soils with contrasting water availability. Sanionia uncinata grows in soil with continuous water supply, while P. alpinum grows in sandy, non-flooded soils. Desiccation and rehydration experiments were carried out to test for differences in the rate of water loss and uptake, with non-structural carbohydrates analysed to test their role in these processes. RESULTS: Individual plants of S. uncinata lost water 60 % faster than P. alpinum; however, clumps of S. uncinata took longer to dry than those of P. alpinum (11 vs. 5 h, respectively). In contrast, rehydration took less than 10 min for both mosses. Total non-structural carbohydrate content was higher in P. alpinum than in S. uncinata, but sugar levels changed more in P. alpinum during desiccation and rehydration (60-50 %) when compared to S. uncinata. We report the presence of galactinol (a precursor of the raffinose family) for the first time in P. alpinum. Galactinol was present at higher amounts than all other non-structural sugars. CONCLUSIONS: Individual plants of S. uncinata were not able to retain water for long periods but by growing and forming carpets, this species can retain water the longest. In contrast individual P. alpinum plants required more time to lose water than S. uncinata, but as moss cushions they suffered desiccation faster than the later. On the other hand, both species rehydrated very quickly. We found that when both mosses lost 50 % of their water, carbohydrates content remained stable and the plants did not accumulate non-structural carbohydrates during the desiccation prosses as usually occurs in vascular plants. The raffinose family oligosaccarides decreased during desiccation, and increased during rehydration, suggesting they function as osmoprotectors.
Descritores: Bryopsida/metabolismo
Metabolismo dos Carboidratos/fisiologia
Carboidratos/análise
Água/metabolismo
-Análise de Variância
Regiões Antárticas
Desidratação
Dissacarídeos/análise
Células Germinativas Vegetais
Fatores de Tempo
Água/análise
Responsável: CL1.1 - Biblioteca Central


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Id: lil-392641
Autor: Villagrán Moraga, Carolina; Barrera, Elizabeth.
Título: Los musgos del archipiélago de Chiloé: Región de Los Lagos, Chile / Mosses of Chiloé archipelago: Lakes Region, Chile.
Fonte: Santiago; Corporación Nacional Forestal; 2002. 24 p. ilus, mapas, tab, graf.
Idioma: es.
Descritores: Bryopsida
-Chile
Responsável: CL27.1 - Biblioteca de Salud Dr. Bogoslav Juricic Turina
CL27.1; QV766, V714m


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Texto completo SciELO Venezuela
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Id: lil-365106
Autor: Villarroel, Mario; Acevedo, Carol; Yáñez, Enrique; Biolley, Edith.
Título: Propiedades funcionales de la fibra del musgo sphagnum magellanicum y su utilización en la formulación de productos de panadería / Functional properties of sphagnum magellanicum fiber and its direct use in formulation of bakery products
Fonte: Arch. latinoam. nutr;53(4):400-407, dic. 2003. tab, graf.
Idioma: es.
Resumo: Se estudiaron las propiedades funcionales de la fibra del musgo Sphagnum magellanicum. determinandose: la capacidad de absosrción (CAA) y retención de agua (CRA), capacidad de absorción de moléculas orgánicas (CAMO), capacidad de hinchamiento (CH) y capacidad de intercambio catiónico (CIC). Fracciones de tamaño de partícula T1 (1.4mm); (1.0mm); T3 (0.425mm); T4 (0.180mm) fueron analizadas para medir su efecto sobre estas propiedades. Las mejores respuestas de CAA, CRA, CAMO y CH se obtuvieron con T3, con la excepción de la CIC cuyo mejor resultado se obtuvo con T1. Se desarrollo una formulación optimizada de pan enriquecido con fibre de musgo analizando simultaneamente el efecto de cuatro variables independientes: levadura, agente esponjante, fibra de musgo y manteca vegetal sobre la calidad sensorial del pan. La variable más significativa (p<0.05) resultó ser la levadura con participación del 50 por ciento sobre la respuesta. Muestras de pan con fiebre se almacenaron a 20 grados centígrados y 6 grados centígrados para determinar su vida útil. La mejor respuesta de calidad sensorial se obtuvo con las muestras refrigeradas, que permanecieron aptas para su consumo por un tiempo de dos semanas
Descritores: Bryopsida
-Nutrição em Saúde Pública
Venezuela
Tipo de Publ: Revisão
Responsável: VE1.1 - Biblioteca Humberto Garcia Arocha


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Texto completo SciELO Brasil
Mortara, Renato A
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Id: lil-340125
Autor: Araya, Jorge e; Neira, Iván; Silva, Solange da; Mortara, Renato A; Manque, Patricio; Cordero, Esteban; Sagua, Hernán; Loyola, Alberto; Bórquez, Jorge; Morales, Glauco; González, Jorge.
Título: Diterpenoids from Azorella compacta (Umbelliferae) active on Trypanosoma cruzi
Fonte: Mem. Inst. Oswaldo Cruz;98(3):413-418, Apr. 2003. ilus, tab.
Idioma: en.
Projeto: International Foundation for Science; . Fondo Nacional de Desarrollo Cientifico y Tecnologico de Chile; . Universidad de Antofagasta. Dirección de Investigacion; . Fundação de Amparo à Pesquisa do Estado de São Paulo.
Resumo: The anti-Trypanosoma cruzi activity of natural products isolated from Azorella compacta was evaluated, with particular emphasis on their effect against intracellular amastigotes. Five diterpenoids from A. compacta derived from mulinane and azorellane were isolated and identified. Only two products, named azorellanol (Y-2) and mulin-11,3-dien-20-oic acid (Y-5), showed trypanocidal activity against all stages of T. cruzi including intracellular amastigotes. At 10 æM, these compounds displayed a strong lytic activity. It ranged from 88.4 ± 0.6 to 99.0 ± 1 percent for all strains and stages evaluate, with an IC50 /18 h values of 20-84 æM and 41-87 æM, respectively. The development of intracellular amastigotes was also inhibited by nearly 60 percent at 25 æM. The trypanocidal molecules Y-2 and Y-5 did show different degrees of cytotoxicity depending on the cell line tested, with an IC50 /24 h ranging from 33.2 to 161.2 æM. We evaluated the effect of diterpenoids against intracellular T. cruzi forms by immunofluorescent identification of a specific membrane molecular marker (Ssp-4 antigen) of the T. cruzi amastigote forms. The accuracy and reproducibility of the measurements were found to be outstanding when examined by confocal microscopy
Descritores: Bryopsida
Diterpenos
Extratos Vegetais
Tripanossomicidas
Trypanosoma cruzi
-Células Cultivadas
Diterpenos
Estudos de Avaliação
Dose Letal Mediana
Microscopia Confocal
Reprodutibilidade dos Testes
Tripanossomicidas
Limites: Animais
Responsável: BR1.1 - BIREME



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