Analysis of sponge spicules as paleoenvironmental indicators in western Bahia lacustrine sediments [Análise de espículas de esponjas como indicadores paleoambientais em sedimentos lacustres no oeste da Bahia]
Dos Santos G.B.,Centro das Humanidades |
De Tarso Amorim Castro P.,Federal University of Ouro Preto |
Parolin M.,University Estadual do Parana |
Docio L.,UNEB |
Costa D.H.,Centro das Humanidades
Revista Brasileira de Paleontologia | Year: 2016
The use of sponge spicules in sediments as proxy data has been successful in paleoenvironmental reconstructions. We recovered two sedimentary cores in two ponds located in San Francisco lowland in Western Bahia to understand the paleoclimatic and the lacustrine system dynamics. Sedimentary facies and granulometric analysis were perfomed. Also, organic matter content and presence of diatoms frustules were studied, besides the identification and quantification of sponge spicules detected in sediments, which were dated by 14C. The sediment age ranged between 8410 to 3929 yrs cal BP, corresponding to the Holocene. Sponge spicules of the following species were found: Dosilia pydanieli, Heterorotula fistula, Metania spinata, Oncoslera sp., Radiospongilla inesi and Tubella variabilis. Analysis of the results suggest that the two lakes have a standardized climate pattern alternating between drier and wetter climates in relation to the current climate condition. However, the two lakes differ regarding the sedimentation rate and the microfossil content the pond of the northern portion showed lentic and lotic alternated phases, indicating a paleodrainage at the beginning of the upper Holocene, while the evidences in the southern pond of the lake system there are only lentic phases. Such evidences suggest that other physiographic factors and climate influenced the dynamics of these lakes, such as structure, litholog and tectonics of the ponds substrates. © 2016 by the Sociedade Brasileira de Paleontologia.
Physical and physicochemical characterization of mangabeira fruits(hancornia speciosa gomes) in western bahia [Caracterização física e físico-química de frutos de mangabeira (hancornia speciosa gomes) no oeste da bahia]
Nascimento R.S.M.,Federal University of Viçosa |
Cardoso J.A.,IFTO |
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The 'mangaba' is widely used by agribusiness, as compared to other native fruits of Northeast, especially in the Cerrado biome for food utilization. This study aimed to evaluate the physical and physicochemical characterization of 'mangabeira' fruits in the western region of Bahia. Tree hundred fruits were sampled from ten matrices, which were collected in an area of the municipalities of Angical, Barreiras and St Desiderio and conducted to the Seed Laboratory of UNEB. For the physical assessments, longitudinal and transversal diameters of the fruit, fruit weight, total seed weight per fruit, weight of the pulp and peel, and yield of pulp and peel were considered. As for the physicochemical evaluations, the fruit pulp was subjected to the determinations of pH, soluble solids content, titratable acidity and ratio. For the variables, longitudinal and transversal diameters, the weight of pulp and peel, seed weight, fruit weight and yield of pulp and peel, the means were, respectively, 32.34 and 31.87 mm, 14.77, 2.40 and 17.17 g and 85.93%. With regard to pH, SS, AT and ratio (SS/AT), the means were 3.93, 17.04° Brix, 0.98 and 18.62. The results indicated that there are statistically significant differences between all variables evaluated.
Survey of fungi causing postharvest rot in seedless grapes in agricultal polo of Juazeiro-BA and Petrolina-PE [Fungos causadores de podridões pós-colheita em uvas apirênicas no pólo agrícola de juazeiro-BA e petrolina-PE]
Camargo R.B.,UNEB |
Peixoto A.R.,UNEB |
Terao D.,Embrapa Semiarido |
Ono E.O.,São Paulo State University |
Cavalcanti L.S.,Universidade São Francisco
Revista Caatinga | Year: 2011
In Brazil, postharvest diseases caused by pathogenic microorganisms are a major problem that causes damage to around 80% of the total fruit production. In the lower middle São Francisco river valley numerous studies on identification and control of fungal diseases during postharvest of grapes are needed, in order to minimize losses in this step. In this context, bunches of seedless varieties 'Crimson', 'Sonaka'; 'Superior' and 'Thompson' were collected from July to November 2009, in order to identify and quantify the incidence of pathogenic fungi. The grapes were collected on five farms which specialize in the production of table grapes for export, all located in Juazeiro - BA and Petrolina - PE. During this period, 10 samples were taken. In the fruit farm five plants were used for sampling, and removal of two bunches of grapes per plant, totaling 10 bunches per variety. Subsequently, they were sent to the laboratory of Plant Pathology at UNEB/DTCS where they were placed separately in a moist chamber for 48 hours at an average temperature of 23 °C. After this period, isolations of berries and stems in Petri plates containing PDA - potato-dextrose-agar were carried out with 10 repetitions, which were placed on benches under laboratory conditions. From the 8th day on, the presence of Aspergillus niger, Alternaria alternata, Cladosporium herbarum, Lasiodiploidia theobromae was observed, which presented the highest incidence, as well as Rhizopus stolonifer, Penicillium expansum.
De Souza S.F.,UNEB |
Ribeiro V.G.,Bahia State University
Revista Brasileira de Fruticultura | Year: 2016
With this study, the objective was to determine the most economic management of irrigation water applied at different levels in the culture of passion fruit grown in conventional system and in polyethylene bags. The experiment was conducted in the city of Remanso, state of Bahia, Brazil. The experimental set-up was a randomized block design in a factorial design 2 (conventional system, and polyethylene bags of 100 L) x 5 (irrigation levels: 100%, 80%, 60%, 40% and 20% an irrigation management at field capacity) with four replications and four plants per plot. The treatments began 30 days after transplanting the seedlings to the field, and the analyzed variables were: plant height, stem diameter, leaf area and number of tertiary branches, of flower buds and fruits per plant. The data were interpreted by means of analyses of variance (test F) and means were compared by Tukey test at 5% probability of error. It was found that the yellow passion fruit got greater agronomic performance when grown in polyethylene bags, with irrigation management at 80 % field capacity. © 2016, Sociedade Brasileira de Fruticultura. All Rights Reserved.
Ethnobotanical study of medicinal plants used by the Sisal Community in the city of Catu, Bahia, Brazil [Estudo Etnobotânico de plantas medicinais utilizadas pela Comunidade do Sisal no município de Catu, Bahia, Brasil]
Neto F.R.G.,Bahia State University |
Almeida G.S.S.A.,UNEB |
Jesus N.G.,UNEB |
Revista Brasileira de Plantas Medicinais | Year: 2014
The use of medicinal plants is instinctive in animals, since some of these seek roots, bark, leaves or fruits in an attempt to cure their diseases. Man, in turn, learned to use this information on the use of these plants empirically. Folk medicine is an important alternative, probably the most used to cure diseases by indigenous peoples, Afro-descendants and rural populations. Ethnobotany, in turn, undertakes to study and interpret the relationship of men with the plant world. Because of its great biological and cultural potential, Brazil has a wealth of traditional knowledge and important plant species, what makes this country a great source of research in the area. To evaluate the traditional knowledge of the rural population of Sisal, city of Catu, state of Bahia, Brazil, related to use of medicinal plants, this work began in July 2009, consisting of semi-structured and structured interviews, recordings, photographs, collection of botanical material indicated in the interviews with informants, treatment of the collected material and incorporation into the Herbarium of the University of Bahia (HUNEB). We identified and collected 54 species in 46 genera and 28 families, being Asteraceae and Lamiacaeae the most representative. Most plants are herbs grown in the backyards of the residents. The study revealed that the community has a very rich folk medicine, with a great diversity of plant species and uses by the population. © 2014, Instituto de Biociencias. All rights reserved.
Monteiro R.L.S.,UNEB |
Fontoura J.R.A.,UNEB |
Carneiro T.K.G.,Federal University of Bahia |
Moret M.A.,UNEB |
Physica A: Statistical Mechanics and its Applications | Year: 2014
Recent studies have focused on models to simulate the complex phenomenon of evolution of species. Several studies have been performed with theoretical models based on Darwin's theories to associate them with the actual evolution of species. However, none of the existing models include the affinity between individuals using network properties. In this paper, we present a new model based on the concept of affinity. The model is used to simulate the evolution of species in an ecosystem composed of individuals and their relationships. We propose an evolutive algorithm that incorporates the degree centrality and efficiency network properties to perform the crossover process and to obtain the network topology objective, respectively. Using a real network as a starting point, we simulate its evolution and compare its results with the results of 5788 computer-generated networks. © 2014 Elsevier Ltd. All rights reserved.
de Aragao F.A.S.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais |
de Sousa Nunes G.H.,UFERSA |
de Queiroz M.A.,UNEB
Crop Breeding and Applied Biotechnology | Year: 2015
Significant genotype vs. environment interaction (G x E) is expected as a result of geographical diversity and differences in management techniques in melon growing. Ninety-six F3 families from the cross between inodorus and conomon melons were evaluated in three environments for studying interaction. The G x E interaction, genetic parameters, and direct and indirect gains were estimated. Average weight of the fruit, pulp thickness, cavity thickness, pulp firmness, and soluble solids were evaluated. The simple part of the G x E interaction was always greater than 99%, except for pulp firmness, where there was predominance of the complex part. The coefficient of genetic variation and genetic variance were overestimated by the G x E interaction. The direct gains from selection were higher than the indirect, except when selection was made by the mean of the three environments. Genotype assessments in more than one location are necessary, but selection should be made by the mean values of families in the environments. © 2015, Brazilian Society of Plant Breeding. All rights reserved.
Crop performance of onion cultivars under different irrigation managements in the lower São Francisco basin [Desempenho agronômico de cultivares de cebola sob diferentes manejos de irrigação no submédio São Francisco]
Bandeira G.R.L.,Empresa Baiana de Desenvolvimento Agricola |
de Queiroz S.O.P.,UNEB |
Aragao C.A.,UNEB |
Costa N.D.,Embrapa Semiarido |
Santos C.A.F.,Embrapa Semiarido
IRRIGA | Year: 2013
This work aimed to study the development of five onion cultivars (IPA 10, IPA 11, Alfa São Francisco, Serena and Antares), in Juazeiro, State of Bahia, Brazil, drip irrigated, under four methods of irrigation management: Penman - Monteith FAO, tensiometry, 100% and 70% of class A pan evaporation. The experimental design was completely randomized, in a split-plot design, consisting of four irrigation management methods in the plots and five onion cultivars in the subplots. The variables evaluated were: total yield, marketable yield, yield of type 1, 2, 3 and 4 bulbs, pyruvic acid content and soluble solids content. There was no interaction effect between irrigation management methods and the onion cultivars. The yield and quality of Serena and Antares cultivars were significantly higher than the ones of the other cultivars. The irrigation management based on class A pan at 70% resulted in a lower performance for the variable marketable yield.
da Silva V.D.,UNEB |
de Queiroz S.O.P.,UNEB
IRRIGA | Year: 2013
The production of lettuce requires precise irrigation management due to the short cycle of production, especially in protected environment, because of the high production cost. This study aimed to contribute to the development of a system to grow lettuce in a protected environment suitable to the climatic conditions of the Lower Basin of the São Francisco Valley in Brazil. Was carried two experiments, in the first was evaluated the productive performance of lettuce crisp, smooth and american cultivars groups, under irrigation management by tensiometry, adopting randomized complete block design with nine varieties of lettuce, repeated five times. In the second experiment, the three cultivars used in the previous experiment were grown under five irrigation managements. It was adopted a completely randomized design in a split plot, with five irrigation management in the plots: replacement of water by 100%, 120% and 140% from evaporation of the class A tank, piche evaporimeter and tensiometry, and three cultivars in subplots: Kaiser, Monica and Elizabeth, repeated seven times. In both experiments the variables analyzed were: plant height (AP), the fresh mass of shoots (MMFPA), number of leaves (NF), roseter diameter (DR), dry mass of shoots (MMSPA) and was add to the second experiment the productivity (PROD) and water use efficiency (EUA). It was observed that the highest value obtained for efficient use of water occurred on the management using class A tank with 140% of water replenishment from the amount of water evaporated, and a correlation increase with increase of applied water to all variables.
de Santana L.R.R.,UNEB |
Benedetti B.C.,University of Campinas |
Sigrist J.M.M.,Grupo de Engineering e Pos colheita ITAL
Revista Brasileira de Fruticultura | Year: 2010
The sensory, physical and chemical characteristics of 'Douradão' peaches cold stored in different modified atmosphere packaging (LDPE bags of 30, 50, 60, 75μm thickness) were studied. After 14, 21 and 28 days of cold storage (1 ± 1 °C and 90 ± 5% RH), samples were withdrawn from MAP and kept during 4 days in ambient air for ripening. Descriptive terminology and sensory profile of the peaches were developed by methodology based on the Quantitative Descriptive Analysis (QDA). The assessors consensually defined the sensory descriptors, their respective reference materials and the descriptive evaluation ballot. Fourteen individuals were selected as judges based on their discrimination capacity and reproducibility. Seven descriptors were generated showing similarities and differences among the samples. The data were analysed by ANOVA, Tukey test and Principal Component Analysis (PCA). The atmospheres that developed inside the different packaging materials during cold storage differed significantly. The PCA showed that MA50 and MA60 treatments were more characterized by the fresh peach flavour, fresh appearance, juiciness and flesh firmness, and were effective for keeping good quality of 'Douradão' peaches during 28 d of cold storage. The Control and MA30 treatments were characterized by the mealiness, the MA75 treatment showed lower intensity for all attributes evaluated and they were ineffective to maintain good quality of the fruits during cold storage. Higher correlation coefficients (positive) were found between fresh appearance and flesh firmness (0.95), fresh appearance and juiciness (0.97), ratio and intensity of fresh peach smell (0.81), as well as higher correlation coefficients (negative) between Hue angle and intensity of yellow colour (-0.91), fresh appearance and mealiness (-0.92), juiciness and mealiness (-0.95), firmness and mealiness (-0.94).