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Vilegas, Wagner
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Id: biblio-1039123
Autor: Benvenutti, Régis Carlos; Gomes, Denise B; Zanchet, Barbara; Locateli, Gelvani; Vechia, Cristian Alex Dalla; Zanotelli Serpa, Patrícia; Lutinski, Junir; Rodrigues Junior, Sinval Adalberto; Schönell, Amanda Patrícia; Diel, Kriptsan Abdon Poletto; Miorando, Daniela; Ernetti, Jackeline; Alves, Bianca de Oliveira; Zilli, Gabriela Adriany Lisboa; Banzato, Thais Petrochelli; Ruiz, Ana Lúcia Tasca Gois; Vidal Gutiérrez, Max; Vilegas, Wagner; Roman Junior, Walter Antônio.
Título: Antiproliferative Effect of Urera baccifera Leaves Against Ovarian Carcinoma Cell Line (OVCAR-3)
Fonte: Braz. arch. biol. technol;62:e19180531, 2019. tab, graf.
Idioma: en.
Projeto: Capes; . CNPq; . Unochapecó.
Resumo: Abstract Natural products, especially phytochemicals, have been extensively studies and have exhibited important antiproliferative effects. The American native species Urera baccifera (L.) Gaudich. ex Wedd. (Urticaceae) is widely distributed in Brazil, where it is known as urtiga-vermelha or urtigão. The leaves are popularly used as anti-inflammatory, antirheumatic and in the treatment of gastric disorders. However, the antiproliferative potential of this plant against human tumor cells remain to be elucidated. In this study, we evaluated the antiproliferative effects of U. baccifera leaves extracts and fractions against a panel of human tumor cell lines in vitro besides a chemical evaluation of the most active sample by mass spectrometry (ESI-IT-MSn). The hydroalcoholic extract was inactive while dichloromethane extract showed moderate cytostatic activity against ovarian carcinoma cell line (OVCAR-3, GI50 = 1.5 μg/mL). More, the ethyl acetate and n-butanol fractions did not show important activity against tumour cell while the dichloromethane and hexane fractions showed moderate cytostatic activity against ovarian tumor cell line (OVCAR-3, GI50 = 12.7 and 9.4 μg/mL, respectively). Finally, the chemical profile evaluated by mass spectrometry (ESI-IT-MSn) allowed the detection of flavonoids in the HEU and hydroxylated fatty acid in DEU that can explain partially the biological effects observed. This is the first report of the antiproliferative effects of U. baccifera, and DEU has shown potential as a promising source of bioactive compounds.
Descritores: Neoplasias Ovarianas/tratamento farmacológico
Plantas Medicinais/efeitos dos fármacos
Fenômenos Químicos/efeitos dos fármacos
Antineoplásicos/farmacologia
-Espectrometria de Massas/instrumentação
Responsável: BR1.1 - BIREME


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Id: biblio-1039134
Autor: Tawadare, Rakesh; Thangadurai, Devarajan; Khandagave, Rayappa Bharamappa; Mundaragi, Abhishek; Sangeetha, Jeyabalan.
Título: Phenotypic Characterization and Genetic Diversity of Sugarcane Varieties Cultivated in Northern Karnataka of India based on Principal Component and Cluster Analyses
Fonte: Braz. arch. biol. technol;62:e19180376, 2019. tab, graf.
Idioma: en.
Resumo: Abstract: Sugarcane is a major commercial crop grown in India and across the world. Hence, several elite varieties have been developed now-a-days to overcome many obstacles including abiotic stresses and diseases. The present study was undertaken to screen genetic variation among twenty four sugarcane varieties that are commonly cultivated across Northern Karnataka, India with reference to physicochemical characters. Experiment was conducted in triplicate following randomized complete block design (RCBD) at S. Nijalingappa Sugar Institute, Belagavi, Karnataka, India during February 2016-17. Physiological parameters such as internode length, stalk height, plant height, stalk girth, number of internodes, single cane weight, single cane volume of juice, cane yield and recovery were investigated. Further, statistical techniques such as principal component analysis and agglomerative hierarchical clustering were performed to characterize the twenty four varieties. Among twenty four sugarcane varieties studied, Co 86032 and CoC 671 were found to be elite varieties with respect to sugar recovery and cane yield, whereas varieties such as Co 86032 and Com 0265 were found to be best with respect to cane yield only. Based on the results obtained, eight varieties, viz., Co SNK 09232, Com 0265, Co 86032, Co SNK 09293, Co SNK 07680, CoC 671, Co 13006 and Co 2001-15 were found to be good with respect to overall qualities. Further studies need to be involved with molecular marker that would help in identification of elite varieties which could substantially contribute to construction of genetic resources library that may in turn find maximum use in molecular breeding.
Descritores: Filogenia
Saccharum/genética
-Análise de Componente Principal/métodos
Fenômenos Químicos
Responsável: BR1.1 - BIREME


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Id: biblio-1285553
Autor: Santos, Beatriz Vieira dos; Travaini, Rodolfo; Lorenzo-Hernando, Ana; Pasquini, Daniel; Baffi, Milla Alves.
Título: Biomass Sorghum: Effect of Acid, Basic and Alkaline Peroxide Pretreatments on the Enzymatic Hydrolysis and Ethanol Production
Fonte: Braz. arch. biol. technol;64:e21200117, 2021. tab.
Idioma: en.
Projeto: regional government of Castilla y León.
Resumo: Abstract This study evaluated the effects of three chemical pretreatments of biomass sorghum (BS): dilute alkaline (PTA1 and PTA2), dilute acid (PTB1 and PTB2) and alkaline hydrogen peroxide (PTC1 and PTC2) in the enzymatic hydrolysis and ethanol production. Among the six investigated conditions, the pretreatment with 7.36% H2O2 (PTC2) was the most efficient in the lignin removal and preservation of the polysaccharide fraction. After the enzymatic hydrolysis, increases in the glucose and xylose concentrations were observed in the pretreated BS hydrolysates, mainly in PTB1 and PTC1. All the hydrolysates obtained low concentrations of inhibitors. In the alcoholic fermentations with Pichia stiptis, the greatest ethanol yield was obtained in PTB1 hydrolysate (3.84 g L-1), corresponding to 16.15% of yield. The highest ethanol yield in PTB1 hydrolysate can be justified by the maximum concentration of xylose obtained in this hydrolysate, demonstrating the potential of P. stiptis in the fermentation of pentose to ethanol. The results indicated that biomass sorghum is an alternative lignocellulose source with potential for the production of second generation ethanol, opening up prospects for additional studies.
Descritores: Biomassa
Etanol
-Fenômenos Químicos
Peróxido de Hidrogênio
Metais Alcalinos
Responsável: BR1.1 - BIREME


  4 / 461 LILACS  
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Id: biblio-1281101
Autor: Borges, Mariana Maciel Batista; Frank, Mayara Conde; Zancan, Rafaela Fernandes; Tartari, Talita; Vivan, Rodrigo Ricci; Duarte, Marco Antonio Hungaro.
Título: Physicochemical properties and antimicrobial activity of calcium hydroxide pastes in association with other compounds
Fonte: Braz. j. oral sci;20:e212098, jan.-dez. 2021. ilus.
Idioma: en.
Resumo: Aim: This study aimed to evaluate the pH, Ca2+ release, solubility, and antimicrobial activity of calcium hydroxide (Ca(OH)2) pastes in association with different substances. Methods: Sixty acrylic teeth (n=10) were filled with pastes that associated Ca(OH)2 with the following substances: benzalkonium chloride 5% (G1) and 50% (G2) both in propylene glycol, arnica glycolic extract (G3), green tea glycolic extract (G4), Calen/PMCC™ (G5), and Calen™ (G6). In the group G1 to G4 were used 1g of Ca(OH)2 powder with 0,8g of vehicle. pH and Ca2+ release was measured after 7, 15, and 30 days. For solubility, micro-CT was used immediately and at the periods of 7, 15, and 30 days. For the antimicrobial analysis, a biofilm of E. faecalis was induced in vitro on bovine dentin discs. Live/dead viability dye and confocal scanning microscopy were used. Results: The highest pH values occurred on the first 7 days, and the G6, G1, G3, and G5 presented the highest pH values at this period (P <0.05). Ca2+ release was higher in all groups at 7 days, with the highest values observed in G1, G5, and G6. The volume of all pastes showed no significant difference in the intragroup analysis at 7 and 15 days (P <0.05). G1 and G2 showed the highest antimicrobial action (P <0.05). For the biovolume, there was difference between the G6 and the other groups (P >0.05) with G1 presenting the lowest values. Conclusion: Benzalkonium chloride 5% increases the antimicrobial action of the Ca(OH2), without impairs physicochemical properties
Descritores: Materiais Restauradores do Canal Radicular
Hidróxido de Cálcio
Biofilmes
Fenômenos Químicos
Anti-Infecciosos
Responsável: BR218.1 - Biblioteca Carlos Henrique Robertson Liberalli


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Id: biblio-1132167
Autor: Kumar, Vikas; Joshi, Vinod Kumar; Thakur, Narayan Singh; Sharma, Nivedita; Gupta, Rakesh Kumar.
Título: Effect of Artificial Ageing Using Different Wood Chips on Physico-chemical, Sensory and Antimicrobial Properties of Apple Tea Wine
Fonte: Braz. arch. biol. technol;63:e20180413, 2020. tab, graf.
Idioma: en.
Resumo: Abstract: Freshly prepared apple tea wine (a combination of tea extract and apple juice) is having yeasty and dull flavour, which needs to be improved to increase the acceptability of this product. Therefore, an attempt has been made for artificial ageing of apple tea wine using different wood chips to improve its physico-chemical, sensory and antimicrobial attributes. Different types of wood chips (Quercus spp., Bombax spp. and Acacia spp.) were added respectively (2.5 g/L to the freshly prepared apple tea wine) and allowed for ageing in carboys for the six months at the room temperature. The influence of each wood species on physico-chemical, sensory and antimicrobial attributes was tested upto 6 months of storage. Storage intervals significantly affected all the physico-chemical attributes (except total sugars, volatile acidity, and antioxidant activity), whereas, the addition of wood chips affected titratable acidity, ethanol, higher alcohols, total phenols, and amino acid. Cluster analysis of the physico-chemical attributes data revealed the same and showed that storage intervals exerted more effect on the physico-chemical and antimicrobial properties of the apple tea wine rather than the wood chips. The antimicrobial activity of 6 months aged wine was low as compared to the fresh wine. Among all the wood chips, apple tea wine aged with Quercus spp. possesses a significantly higher score (according to desirability) than the wine aged with other wood chips and control. In nutshell, apple tea wine matured with Quercus spp. wood chips for 6 months were the best with improved physico-chemical and sensory attributes.
Descritores: Chá/química
Vinho/análise
Malus/química
Sucos
Antibacterianos/farmacologia
-Fenômenos Químicos
Limites: Humanos
Responsável: BR1.1 - BIREME


  6 / 461 LILACS  
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Id: lil-791174 LILACS-Express
Autor: Tejada Tovar, Candelaria; Villabona Ortiz, Angel; Ruiz Paternina, Erika.
Título: ADSORCIÓN DE NI (II) POR CÁSCARAS DE ÑAME (Dioscorea rotundata) Y BAGAZO DE PALMA (Elaeis guineensis) PRETRATADAS / ADSORPTION OF NI (II) BY PRETREATED YAM PEELS (Dioscorea rotundata) AND OIL PALM PULP (Elaeis guineensis)
Fonte: Rev. luna azul;(42):30-43, ene.-jun. 2016. ilus, tab.
Idioma: es.
Resumo: El níquel es un metal pesado altamente contaminante que por sus efectos toxicológicos es materia de gran preocupación, por lo que toma importancia la búsqueda de alternativas para su remoción, siendo la adsorción una alternativa aplicable para la remoción metálica, interesante por su eficiencia y bajo costo. Se propone así la adsorción de Ni (II) usando dos materiales de desecho altamente disponibles en la región Caribe colombiana: cáscaras de ñame y bagazo de palma, ambas biomasas tratadas con ácido cítrico. Los experimentos fueron llevados a cabo en sistema batch en solución acuosa de níquel a una concentración de 100 ppm. La concentración residual de la solución fue medida mediante espectroscopia de absorción atómica, encontrando que el proceso de adsorción es altamente dependiente del pH, con un valor óptimo de 6. Por otra parte, se encontró que el Ni (II) presenta una sorción rápida los primeros 50 minutos, además el modelo de Elovich fue el de mejor ajuste. La capacidad máxima de adsorción según la isoterma de Langmuir fue de 68,14; 47,93; 103,3 y 58,7 mg/g para las cáscaras de ñame y el bagazo de palma sin modificar, y modificados químicamente respectivamente, mostrando el valor potencial del uso de estos biomateriales en la remoción de Ni (II) presente en soluciones acuosas.

Nickel is a highly polluting heavy metal which, because of its toxicological effects, is a matter of great concern and the reason why the search for alternatives for its removal, being adsoption an applicative alternative for metal removal which is considered interesting due to its efficiency and low cost. In this way, the Ni (II) adsoption is proposed using two highly available waste materials in the Colombian Caribbean region: yam peels and oil palm pulp, both biomaBes treated with citric acid. The experiments were carried out in batch system using nickel aqueous solution at a concentration of 100 ppm. The residual concentration of the solution was measured by atomic absorption spectroscopy, and it was found that the adsorption proceB is highly dependent of pH with an optimum value of 6. What is more, it was found that Ni (II) presents a quick sorption the first 50 minutes, and Elovich model showed the best fit. The maximum adsorption capacity according to Langmuir isotherm was 68.14, 47.93, 103.3 and 58.7 mg/g for unmodified chemically modified yam peels and oil palm pulp respectively showing a potential value of use of these biomaterials in the removal of Ni (II) present in aqueous solutions.
Descritores: Adsorção
-Dioscorea
Fenômenos Químicos
Níquel
Limites: Humanos
Tipo de Publ: Artigo Clássico
Responsável: CO54.1 - Centro de Biblioteca e Información Científica


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Texto completo
Id: biblio-1132216
Autor: Leonardelli, Cristiane; Silvestre, Wendel Paulo; Baldasso, Camila.
Título: Effect of Chitosan Addition in Whey-based Biodegradable Films
Fonte: Braz. arch. biol. technol;63:e20200178, 2020. tab, graf.
Idioma: en.
Resumo: Abstract Whey, a by-product of dairy industry, is a feedstock widely employed in the production of biodegradable films. However, these films present some limitations when considering the performance of synthetic polymers, especially biological transformation by decomposition. This work aimed to evaluate the effects of chitosan addition to whey-based films to improve films physical-chemical properties and resistance to microbial degradation. The results showed that there was an interaction effect between the chitosan concentration and the storage time for the physical-chemical properties of elongation at break and opacity. There was statistical difference among the formulations; however, for the moisture content and film thickness, there was no interaction effect between the formulation and the storage time. The films with 1.5 and 3.0 wt.% chitosan presented a yellowish hue, characteristic of the polysaccharide; this could also be detected by SEM analysis. The films presented an excellent biodegradability, being decomposed in about 8 days. Considering all chitosan contents tested had similar performances, the chitosan content of 0.15 wt.% was the one with the better cost-benefit relation.
Descritores: Biotransformação/efeitos dos fármacos
Quitosana/farmacologia
Soro do Leite/efeitos dos fármacos
Filmes Comestíveis
Antibacterianos/farmacologia
-Fatores de Tempo
Armazenamento de Produtos
Fenômenos Químicos
Responsável: BR1.1 - BIREME


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Texto completo
Id: biblio-1132233
Autor: Maieves, Helayne Aparecida; Züge, Luana Carolina Bosmuler; Teixeira, Gerson Lopes; Cámara, Montaña; Ribani, Rosemary Hoffmann; Sánchez-Mata, María Cortes.
Título: Chemical Properties, Rheological Behavior, and Melissopalynological Analysis of Selected Brazilian Honeys from Hovenia dulcis Flowering
Fonte: Braz. arch. biol. technol;63:e20190743, 2020. tab, graf.
Idioma: en.
Projeto: CAPES; . Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; . ALIMNOVA UCM group.
Resumo: Abstract Monofloral honeys are high-added-value food, a reason for constant cases of fraud. This study investigated Brazilian monofloral honeys from Hovenia dulcis flowering produced by Apis mellifera and Tetragonisca angustula bees. Chemical, physicochemical, rheological, and melissopalynological analysis were assessed. Properties such as moisture, pH, ashes, total acidity, total available carbohydrate, and soluble sugars of all analyzed honey samples agreed with the established by the legislation. All the honey samples were satisfactorily fitted by both Ostwald-de Waele and Casson rheological models revealing homogenous products, mostly presenting pseudoplastic character. The melissopalynology confirmed the presence of H. dulcis pollen in the MH samples; however, some honeys did not show >45% pollen of H. dulcis, thus revealing mislabeling cases. Continuous evaluation of honey is necessary, once this is a valuable food frequently involved in frauds, hence causing problems to consumers.
Descritores: Mel/análise
-Reologia
Apis mellifica
Fenômenos Químicos
Responsável: BR1.1 - BIREME


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Texto completo
Id: biblio-1132240
Autor: Weber, Caroline Trevisan; Casagrande, Tiago; Candido, Gabriela; Trierweiler, Luciane Ferreira; Trierweiler, Jorge Otávio.
Título: Alternative Process for Production of Sweet Potato Distilled Beverage
Fonte: Braz. arch. biol. technol;63:e20190181, 2020. tab, graf.
Idioma: en.
Resumo: Abstract Shochu is the most widely consumed spirit in Japan. In its manufacture is used koji, a solid fungus culture traditional of the Asian countries, but that makes the production process slow. Shochu can be produced from a variety of starchy sources, including sweet potato. About 7% of the world's sweet potato production is wasted due to imperfections that make it unsuitable for consumption. However, this material can be used in ethanol production. Considering the high productivity of sweet potato in Brazil, an opportunity to add value to this raw material is perceived. An alternative process for the production of sweet potato distillate similar to shochu was proposed. Koji was replaced by a mixture of alpha-amylase and glucoamylase. Process time was reduced from 14 to only 1 day. Composition analyses were performed by HPLC and GC. The experimental yield of alcoholic fermentation using pectinase enzyme reached 67.31-73.65%, but methanol was above the limits of the legislation. Without the addition of pectinase, no methanol was formed. However, there was a decrease in yield (51.65-54.75%), due to the incomplete disintegration of sweet potatoes. The distillate produced and the commercial shochu presented the same absorption bands in FTIR analysis, identifying the similarity between them.
Descritores: Destilação/métodos
Ipomoea batatas/química
Bebidas Alcoólicas
-Cromatografia Líquida de Alta Pressão
Espectroscopia de Infravermelho com Transformada de Fourier
Fenômenos Químicos
Fermentação
Responsável: BR1.1 - BIREME


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Texto completo SciELO Costa Rica
Texto completo
Id: biblio-1003344
Autor: Espinoza-Toledo, Cristina; Vázquez-Ovando, Alfredo; Santos, Rodolfo Torres de los; López-García, Alfonso; Albores-Flores, Victor; Grajales-Conesa, Julieta.
Título: Stingless bee honeys from Soconusco, Chiapas: a complementary approach / Mieles de abejas sin aguijón del Soconusco, Chiapas: enfoque complementario
Fonte: Rev. biol. trop;66(4):1536-1546, oct.-dic. 2018. tab, graf.
Idioma: en.
Resumo: Abstract Stingless bees are located in the tropic areas, and produced a sweet natural substance called pot honey, with different properties and uses. Recently, most studies are focused on characterizing them, in order to contribute to their knowledge and the establishment of quality laws. Thus physicochemical, acceptance and palynological studies were performed in stingless bee honeys from Soconusco, Chiapas, in order to learn and contribute to their knowledge in the Tropics. Nine honey samples were collected from Melipona solani (Ms), M. beecheii (Mb) and Scaptotrigona mexicana (Sm) in different meliponaries. Our results registered physicochemical values that ranged as follow; pH 2.8-4.8, electrical conductivity (EC) 114-1211 μS/cm, free acidity 24-100 meq/kg, aw 59-71 g/100g, moisture 35-38 %, color 0.13-0.75 Pfund scale, reducing sugars 47-71 %, hidroxymethylfurfural (HMF) not determined - 2.72 mg/100g, and diastase activity 1.92-11.22 DN. On the other hand, the principal component analysis (PCA) of physicochemical values showed that 86.9 % of the total variability between species was explained by the following parameters aw, moisture, free acidity, color, pH, sugars and EC. Sm honeys were associated (PCA) with a higher water content, free acidity and darker colors, while Melipona honeys with a sweeter taste and a lower diastase activity; thus honeys could be grouped by genera. The acceptance test showed that 78 % of honeys were preferred, being the SmCa sample in the category "I likely dislike" due to the bitter taste (disapproved by consumers). The melisopalynological results showed that M. beecheii honeys are monofloral with a 45 % of Fabaceae pollen, while Melipona solani and Scaptotrigona mexicana honeys are multi or polyfloral with diferent pollen types; Fabaceae, Melastomataceae, Malvaceae and Asteraceae. From this complementary study we can asume that it is necessary to implicate researchers with producers, so they could have accesss to stingless bee honey analysis and to help them to improve meliponaries management by identifying and introducing stingless bee flora.(AU)

Resumen En las regiones tropicales se ubican las abejas sin aguijón, las cuales producen una sustancia dulce denominada miel de cántaro con propiedades y usos diferentes a los de las abejas melíferas (Apis mellifera). Actualmente, se han desarrollado diversos trabajos enfocados a su caracterización, con la finalidad de contribuir con su conocimiento y el establecimiento de estándares de calidad. En este estudio se realizaron estudios fisicoquímicos, de aceptación y palinológicos en mieles de abejas sin aguijón de Soconusco, Chiapas. Se recolectaron nueve muestras de miel de las siguientes especies: Melipona solani (Ms), M. beecheii (Mb) y Scaptotrigona mexicana (Sm) en diferentes meliponarios. Nuestros resultados registraron valores fisicoquímicos que variaron de la siguiente manera: pH 2.8-4.8, conductividad eléctrica (CE) 114-1 211 μS/cm, acidez libre 24-100 meq/kg, aw 59-71 g/100 g, humedad 35-38 %, color 0.13-0.75 escala Pfund, azúcares reductores 47-71 %, hidroximetilfurfural (HMF) no determinado - 2.72 mg/100 g, y actividad de la días-tasa 1.92-11.22 ND. Por otro lado, el análisis del componente principal (PCA) de los valores fisicoquímicos mostró que el 86.9 % de la variabilidad total entre las especies se explica por los siguientes parámetros: aw, humedad, acidez libre, color, pH, azúcares y CE. Las mieles de Sm (PCA) se asociaron con un mayor contenido de agua, acidez libre y colores más oscuros, mientras que las mieles de Melipona con un sabor más dulce y una actividad de días-tasa más baja; por lo tanto, las mieles podrían agruparse por géneros. La prueba de aceptación mostró que el 78 % de las mieles eran preferidas, siendo la muestra de SmCa en la categoría "Probablemente no me gusta" debido al sabor amargo (desaprobado por los consumidores). Los resultados melisopalinológicos mostraron que las mieles de M. beecheii son monoflorales con un 45 % de polen de Fabaceae, mientras que las mieles de M. solani y S. mexicana son multi o poliflorales con diferentes tipos de polen: Fabaceae, Melastomataceae, Malvaceae y Asteraceae. De este estudio complementario observamos que se requiere poner en contacto a investigadores y productores, para que el acceso a los análisis de las mieles de abejas sin aguijón sea posible, y así mismo se pueda ayudar con el mejoramiento del manejo de los melionarios al momento de identificar e introducir la flora preferida por las abejas sin aguijón.(AU)
Descritores: Pólen
Abelhas
Fenômenos Químicos
Mel
-Zona Tropical
Responsável: BR1.1 - BIREME



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