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Publisher: SciELO   (Total: 715 journals)

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Showing 601 - 715 of 715 Journals sorted alphabetically
Revista Historia y Sociedad     Open Access  
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1, SJR: 0.184, h-index: 2)
Revista Ingenierías Universidad de Medellín     Open Access  
Revista Interamericana de Bibliotecología     Open Access   (Followers: 7)
Revista Internacional de Contaminación Ambiental     Open Access   (SJR: 0.163, h-index: 11)
Revista ION     Open Access  
Revista IUS     Open Access  
Revista Katálysis     Open Access  
Revista Latino-Americana de Enfermagem     Open Access   (SJR: 0.396, h-index: 26)
Revista Latinoamericana de Investigación en Matemática Educativa     Open Access   (SJR: 0.16, h-index: 5)
Revista Latinoamericana de Psicopatologia Fundamental     Open Access   (SJR: 0.223, h-index: 4)
Revista Medica de Chile     Open Access   (SJR: 0.236, h-index: 29)
Revista Médica del Hospital Nacional de Niños Dr. Carlos Sáenz Herrera     Open Access   (Followers: 1)
Revista Médica Electrónica     Open Access  
Revista Médica La Paz     Open Access  
Revista Mexicana de Análisis de la Conducta     Open Access   (SJR: 0.159, h-index: 4)
Revista Mexicana de Astronomía y Astrofísica     Open Access   (SJR: 1.292, h-index: 22)
Revista Mexicana de Biodiversidad     Open Access   (SJR: 0.316, h-index: 13)
Revista Mexicana de Ciencias Agrícolas     Open Access   (Followers: 1)
Revista Mexicana de Ciencias Geológicas     Open Access   (SJR: 0.318, h-index: 26)
Revista Mexicana de Ciencias Pecuarias     Open Access   (Followers: 1, SJR: 0.211, h-index: 4)
Revista Mexicana de Economía y Finanzas     Open Access  
Revista Mexicana de Física     Open Access   (SJR: 0.224, h-index: 18)
Revista mexicana de física E     Open Access  
Revista Mexicana de Fitopatología     Open Access  
Revista Mexicana de Ingeniería Química     Open Access   (SJR: 0.273, h-index: 8)
Revista Mexicana de Investigación Educativa     Open Access   (Followers: 3, SJR: 0.348, h-index: 3)
Revista Mexicana de Micologí­a     Open Access  
Revista Mexicana de Sociologí­a     Open Access   (Followers: 9, SJR: 0.197, h-index: 3)
Revista Musical Chilena     Open Access   (SJR: 0.101, h-index: 2)
Revista MVZ Córdoba     Open Access   (SJR: 0.139, h-index: 6)
Revista Odonto Ciência     Open Access   (SJR: 0.113, h-index: 3)
Revista Opinión Jurídica     Open Access  
Revista Paulista de Pediatria     Open Access  
Revista Perspectivas     Open Access  
Revista Portuguesa de Cirurgia     Open Access   (Followers: 1)
Revista Portuguesa de Imunoalergologia     Open Access   (Followers: 1, SJR: 0.112, h-index: 3)
Revista Portuguesa de Ortopedia e Traumatologia     Open Access  
Revista Portuguesa de Saúde Pública     Open Access   (SJR: 0.117, h-index: 3)
Revista Portuguesa e Brasileira de Gestão     Open Access  
Revista Signos     Open Access   (SJR: 0.155, h-index: 8)
Revista Universitaria de Geografía     Open Access  
Revista Uruguaya de Cardiologia     Open Access  
Revista Veterinaria     Open Access   (SJR: 0.108, h-index: 4)
RGO : Revista Gaúcha de Odontologia     Open Access  
RISTI : Revista Ibérica de Sistemas e Tecnologias de Informação     Open Access   (SJR: 0.203, h-index: 3)
RLA : revista de linguistica teorica y aplicada     Open Access   (Followers: 1, SJR: 0.197, h-index: 6)
Rodriguésia     Open Access   (SJR: 0.317, h-index: 8)
SA Orthopaedic J.     Open Access   (Followers: 2)
Salud Colectiva     Open Access   (SJR: 0.185, h-index: 6)
Salud Mental     Open Access   (Followers: 1, SJR: 0.15, h-index: 19)
Sanidad Militar     Open Access  
São Paulo em Perspectiva     Open Access  
Sao Paulo Medical J.     Open Access   (SJR: 0.237, h-index: 29)
Saúde e Sociedade     Open Access   (SJR: 0.25, h-index: 11)
Saúde em Debate     Open Access  
Sba: Controle & Automação Sociedade Brasileira de Automatica     Open Access  
Scientia Agricola     Open Access   (SJR: 0.418, h-index: 26)
Scientiae Studia     Open Access  
Secuencia     Open Access  
Serviço Social & Sociedade     Open Access   (Followers: 1)
Sexualidad, Salud y Sociedad (Rio de Janeiro)     Open Access   (Followers: 1)
Si Somos Americanos     Open Access  
Signos Filosóficos     Open Access   (SJR: 0.101, h-index: 1)
Silva Lusitana     Open Access  
Sociedad y Religión     Open Access  
Sociedade & Natureza     Open Access  
Sociedade e Estado     Open Access   (Followers: 1, SJR: 0.121, h-index: 5)
Sociologia     Open Access   (SJR: 0.1, h-index: 3)
Sociologias     Open Access   (Followers: 2, SJR: 0.141, h-index: 9)
Sociológica     Open Access   (Followers: 1, SJR: 0.14, h-index: 1)
Soldagem & Inspeção     Open Access   (SJR: 0.356, h-index: 6)
South African Dental J.     Open Access   (SJR: 0.138, h-index: 16)
South African J. of Agricultural Extension     Open Access   (Followers: 4)
South African J. of Animal Science     Open Access   (Followers: 3, SJR: 0.331, h-index: 23)
South African J. of Childhood Education     Open Access   (Followers: 1)
South African J. of Enology and Viticulture     Open Access   (SJR: 0.38, h-index: 13)
South African J. of Industrial Engineering     Open Access   (Followers: 3, SJR: 0.171, h-index: 6)
South African J. of Occupational Therapy     Open Access   (Followers: 27)
South African J. of Surgery     Open Access   (Followers: 1, SJR: 0.201, h-index: 17)
South African Medical J.     Open Access   (Followers: 5, SJR: 0.547, h-index: 45)
Studia Historiae Ecclesiasticae     Open Access   (Followers: 2)
Summa Phytopathologica     Open Access   (SJR: 0.266, h-index: 7)
Tecnología Química     Open Access  
Tecnología y Ciencias del Agua     Open Access   (SJR: 0.169, h-index: 7)
Temas y Debates     Open Access  
Tempo     Open Access   (Followers: 1, SJR: 0.1, h-index: 2)
Tempo Social     Open Access   (Followers: 1, SJR: 0.119, h-index: 4)
Teología y Vida     Open Access   (Followers: 1, SJR: 0.1, h-index: 3)
Terapia Psicológica     Open Access   (SJR: 0.646, h-index: 11)
Texto & Contexto - Enfermagem     Open Access   (SJR: 0.371, h-index: 11)
The European J. of Psychiatry (edicion en español)     Open Access   (Followers: 1)
Tópicos del seminario     Open Access   (Followers: 1)
Toxicodependências     Open Access  
Trabalho, Educação e Saúde     Open Access  
Trabalhos em Linguistica Aplicada     Open Access  
Trans/Form/Ação - Revista de Filosofia     Open Access   (SJR: 0.1, h-index: 2)
Transinformação     Open Access   (Followers: 1, SJR: 0.165, h-index: 2)
Trends in Psychiatry and Psychotherapy     Open Access   (Followers: 9, SJR: 0.225, h-index: 4)
Tydskrif vir Geesteswetenskappe     Open Access   (SJR: 0.239, h-index: 4)
Tydskrif vir Letterkunde     Open Access   (SJR: 0.259, h-index: 3)
Ultima Década     Open Access  
Universitas Philosophica     Open Access  
Universum : Revista de Humanidades y Ciencias Sociales     Open Access   (Followers: 1, SJR: 0.116, h-index: 4)
Vaccimonitor     Open Access   (Followers: 1, SJR: 0.1, h-index: 2)
Varia Historia     Open Access  
Veritas : Revista de Filosofí­a y Teología     Open Access   (Followers: 1)
Veterinaria México     Open Access   (SJR: 0.122, h-index: 7)
Vibrant : Virtual Brazilian Anthropology     Open Access  
Visión de futuro     Open Access  
Water SA     Open Access   (Followers: 1, SJR: 0.381, h-index: 43)
West Indian Medical J.     Open Access   (Followers: 1, SJR: 0.201, h-index: 23)
Yesterday and Today     Open Access   (Followers: 1)
Zoologia (Curitiba)     Open Access   (SJR: 0.464, h-index: 20)

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Journal Cover Scientia Agricola
  [SJR: 0.418]   [H-I: 26]   [0 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0103-9016 - ISSN (Online) 1678-992X
   Published by SciELO Homepage  [715 journals]
  • A smartphone-based apple yield estimation application using imaging
           features and the ANN method in mature period

    • Abstract: ABSTRACT: Apple yield estimation using a smartphone with image processing technology offers advantages such as low cost, quick access and simple operation. This article proposes distribution framework consisting of the acquisition of fruit tree images, yield prediction in smarphone client, data processing and model calculation in server client for estimating the potential fruit yield. An image processing method was designed including the core steps of image segmentation with R/B value combined with V value and circle-fitting using curvature analysis. This method enabled four parameters to be obtained, namely, total identified pixel area (TP), fitting circle amount (FC), average radius of the fitting circle (RC) and small polygon pixel area (SP). A individual tree yield estimation model on an ANN (Artificial Neural Network) was developed with three layers, four input parameters, 14 hidden neurons, and one output parameter. The system was used on an experimental Fuji apple (Malus domestica Borkh. cv. Red Fuji) orchard. Twenty-six tree samples were selected from a total of 80 trees according to the multiples of the number three for the establishment model, whereby 21 groups of data were trained and 5 groups o data were validated. The R2 value for the training datasets was 0.996 and the relative root mean squared error (RRMSE) value 0.063. The RRMSE value for the validation dataset was 0.284 Furthermore, a yield map with 80 apple trees was generated, and the space distribution o the yield was identified. It provided appreciable decision support for site-specific management.
       
  • Prediction of soil CO2 flux in sugarcane management systems using the
           Random Forest approach

    • Abstract: ABSTRACT: The Random Forest algorithm is a data mining technique used for classifying attributes in order of importance to explain the variation in an attribute-target, as soil CO2 flux. This study aimed to identify prediction of soil CO2 flux variables in management systems of sugarcane through the machine-learning algorithm called Random Forest. Two different management areas of sugarcane in the state of São Paulo, Brazil, were selected: burned and green. In each area, we assembled a sampling grid with 81 georeferenced points to assess soil CO2 flux through automated portable soil gas chamber with measuring spectroscopy in the infrared during the dry season of 2011 and the rainy season of 2012. In addition, we sampled the soil to evaluate physical, chemical, and microbiological attributes. For data interpretation, we used the Random Forest algorithm, based on the combination of predicted decision trees (machine learning algorithms) in which every tree depends on the values of a random vector sampled independently with the same distribution to all the trees of the forest. The results indicated that clay content in the soil was the most important attribute to explain the CO2 flux in the areas studied during the evaluated period. The use of the Random Forest algorithm originated a model with a good fit (R2 = 0.80) for predicted and observed values.
       
  • Crossbreeding locally adapted hair sheep to improve productivity and meat
           quality

    • Abstract: ABSTRACT: The use of lambs from crossing of local with specialized sheep breeds for meat production may lead to higher meat deposition and a smaller fat amount in the carcass, with a more adequate nutritional profile for human consumption. This study investigated the performance, carcass and meat characteristics of lambs from the Morada Nova and Santa Inês locally adapted hair breeds and crosses between Dorper × Morada Nova and Dorper × Santa Inês slaughtered at approximately 35 kg. Morada Nova lambs showed lower (p < 0.05) performance compared to the other genetic groups resulting in a higher age at slaughter (p < 0.05). Crossbred Dorper × Santa Inês and Dorper × Morada Nova lambs showed better characteristics for meat production with better (p < 0.05) conformation as well as leg and carcass compacteness index. Dorper × Santa Inês have a fatty acid profile that is more suitable for human consumption than Dorper × Morada Nova lambs do (p < 0.05); however, both had lower (p < 0.05) intramuscular lipid content (as measured by ether extract levels from Longíssimus lumborum) compared with purebred lambs. Therefore, when the objective is to obtain lean meat, with improved nutritional profile to reduce risks of cardiovascular disease, the use of breeds and crosses that reduce animal slaughter age, such as the ½ Dorper × ½ Santa Inês crossbred, is an interesting alternative.
       
  • Empirical models to predict feed intake of growing-finishing pigs reared
           under high environmental temperatures

    • Abstract: ABSTRACT Several empirical models were proposed to predict feed intake (FI) of growingfinishing pigs reared under high environmental temperatures. However, these models have not been evaluated under conditions different from those in which they were developed. Twelve empirical models were evaluated using a database built after systematic literature review (observed data: 28 studies in which the FI was evaluated in pigs under high environmental temperatures). Model accuracy was assessed using the mean squared of prediction error (MSPE). Analyses were performed considering two scenarios: (1) general population, where all observed data were used in the simulation; (2) reference population, where data were filtered in order to simulate only scenarios with environment (temperature range) and animals (body weight and sex) similar to that used in the model development. Six models estimated FI values similar (p > 0.05) to those observed in the general population, while four models produced estimates similar to the observed values in the reference populations. Most models were more accurate when they were simulated using the reference population than when the simulation considered the general database. Moving the simulation from the general database to the reference population reduced up to 98 % of the MSPE, depending on the equation. Empirical models allow to accurately predict FI of growing-finishing pigs exposed to high environmental temperatures, especially in scenarios similar to the ones used for model development. Thus, population characteristics (body weight and sex) and environment (temperature range) must be considered in the model assessment.
       
  • Biochar versus hydrochar as growth media constituents for
           ornamental plant cultivation

    • Abstract: ABSTRACT Biochar and hydrochar have been proposed as novel materials for providing soilless growth media. However, much more knowledge is required before reliable advice can be given on the use of these materials for this purpose. Depending on the material and the technology applied (pyrolysis or hydrothermal carbonization), phytotoxicity and greenhouse gas emissions have been found for certain chars. In this study, our aim was to assess the feasibility of three chars as substrate constituents. We compared two biochars, one from forest waste and the other from olive mill waste, and a hydrochar from forest waste. We studied how chars affected substrate characteristics, plant performance, water economy and respiratory CO2 emission. Substrates containing biochar from forest waste showed the best characteristics, with good air/water relationships and adequate electrical conductivity. Those with biochar from olive mill waste were highly saline and, consequently, low quality. The substrates with hydrochar retained too much water and were poorly aerated, presenting high CO2 concentrations due to high respiratory activity. Plants performed well only when grown in substrates containing a maximum of 25 % biochar from forest waste or hydrochar. After analyzing the char characteristics, we concluded that biochar from forest waste could be safely used as a substrate constituent and is environmentally friendly when applied due to its low salinity and low CO2 emission. However, biochar from olive mill waste and hydrochar need to be improved before they can be used as substrate constituents.
       
  • Boll weevil within season and off-season activity monitored using a
           pheromone-and-glue reusable tube trap

    • Abstract: ABSTRACT: The boll weevil colonizes cotton fields as early as cotton squaring, causing significant losses due to feeding and protected development inside fruiting structures throughout crop phenology. Successful control depends on control of adults and their accurate detection when they colonize the crops. The commercial trap and boll weevil attract-and-control tubes (BWACT) are the only available tools to monitor and attract-and-kill boll weevil, despite limitation in efficacy, and insecticide in BWACT is not allowed in organic production. A grandlure-and-glue reusable and insecticide-free tube (GGT) made with polyvinyl chloride tube, smeared with entomological glue, and lured with pheromone was tested to detect boll weevil activity across various seasons. Boll weevil showed activity during growing season and off-season from 2009 to 2012 in the Semiarid and with higher numbers captured in GGT in comparisons to commercial traps. GGT was able to detect early weevils in the field right after planting. Further, the overall averages resulted in 34-, 16.8-, and 7.5-times more weevils captured in GGTs compared to the traps during stalk destruction in the Semiarid 2011 and Cerrado season 2012/13 and during the harvesting period in the Cerrado season 2011/12, respectively. Therefore, boll weevils were captured actively during season and off-season and early captures obtained in GGT compared to traps showed a better correlation between captures and square damage.
       
  • Effects of transportation stress on quality and sensory profiles of Nile
           tilapia fillets

    • Abstract: ABSTRACT: This study evaluated pre-slaughter stress and its influence on the stress indicators, quality characteristics and sensory characteristics of Nile tilapia fillets. To this end, two experiments were conducted: (1) two transportation times (60 and 240 min), with a density of 200 kg m−3, were compared to control treatment fish (in which the fish were removed from the net cage and immediately euthanized); and (2) two transportation densities (100 and 400 kg m−3), transported for 180 min, compared with control treatment fish. In experiment 1, the transportation time of 60 min resulted in higher levels of serum cortisol and plasma glucose compared to the transportation time of 240 min and the control. Fish fillets transported for 240 min had higher water-holding capacity, less water loss by pressure and higher levels of juiciness compared to fish transported for 60 min. Color, pH and water loss during cooking were not affected by transportation time. In experiment 2, transportation densities of 100 and 400 kg m−3 did not significantly affect the stress indicators nor the instrumental quality parameters of the fillets, but fish transported at 400 kg m−3 showed better visual acceptance by panellists.
       
  • Agronomic and molecular characterization of wild germplasm Saccharum
           spontaneum for sugarcane and energycane breeding purposes

    • Abstract: ABSTRACT: Among the species related to sugarcane, Saccharum spontaneum (L.) is a wild species with the greatest potential as a source of genetic variation to cope with biomass production in harsh environments. Due to its high yield, early vigor, ratooning ability, low input requirements and tolerance to various biotic and abiotic stresses, sugarcane breeders have shown interest in its contribution, as a donor of genes, to the development of high biomass energy canes. The conservation, evaluation and utilization of the genetic variability of S. spontaneum available in germplasm collections are critical for breeding, but, given the aggressive rhizomatous growth habit and the ability to propagate via seed dispersal, S. spontaneum is classified as a noxious weed in several nations, including the U.S.A. As a result, field trials are restrictive and few phenotypic analyses have been carried out on these collections. In the present study, a subset of 130 S. spontaneum accessions obtained from the World Collection of Sugarcane and Related Grasses in Miami, FL has been characterized phenotypically - with either morphological and agronomic traits (including composition analysis) or reaction to abiotic stress and genotypically - molecular markers (Simple Sequence Repeats - SSR). Using these data, a core collection has been established, genotypes with positive agronomic traits have been identified and are being used as parents for hybridization crosses, aimed at genetic improvement of sugarcane and energycane.
       
  • Vigor and mortality of citrus progenies with potential use as rootstocks

    • Abstract: ABSTRACT: Rootstocks influence certain characteristics of the scion, such as vigor, fruit yield and quality, and tolerance to biotic and abiotic factors. In conventional citrus breeding programs, hybridization is the main method used for obtaining rootstock varieties. Between Sept and Oct 2006, controlled pollinations were carried out resulting in nine progenies, totaling 461 hybrid seedlings. The female parents were the ‘Santa Cruz Rangpur’ lime (SCRL) and the ‘Sunki of Florida’ mandarin (SFM), while the male parents, in addition to this mandarin, were the ‘Indio’ and ‘Riverside’ citrandarins, the ‘Thomasville’ citrangequat (THOM), the ‘Swingle’ citrumelo, the ‘Argentina’ citrange (AGC) and the ‘Benecke’ trifoliate orange (BKTO). Fruit setting rates of these crosses were measured and the hybrids generated were planted in the field in 2008 and evaluated from 2010 to 2014, for the variables of plant mortality, visual vigor, plant height and trunk diameter. The descriptive statistics mean, variation range, coefficient of variation and Pearson skewness coefficient were calculated. Data were submitted to analysis of variance and the means of the treatments were grouped by the Scott-Knott test, both at 5 % significance. The progenies, having the ‘Sunki’ mandarin as the female parent, presented higher fruit setting rates and lower plant mortality rates than those obtained from the female parent ‘Rangpur’ lime, while zero plant mortality was observed in the SFM × BKTO cross. The crosses SCRL × SFM, SFM × BKTO, SFM × AGC and SFM × THOM have the potential to generate vigorous hybrids, resulting in rootstock varieties adapted to the landscape unit of Coastal Tableland.
       
  • Sod production and the effects of liquid organo-mineral fertilizers and
           thickness of sod

    • Abstract: ABSTRACT: Nitrogen fertilization and an appropriate cutting thickness can result in firmer sod that can be handled in less time with greater turfgrass regrowth during the subsequent cycle. This experiment was conducted on a sod production farm located in Capela do Alto, in the state of Sao Paulo, Brazil. The soil was a dystrophic Rhodic Hapludox (Oxisol) with a medium texture. The experiment had two statistical designs; the initial design was randomized blocks with seven treatments and four replicates. Treatments were five doses of liquid organo-mineral fertilizer (OMF) corresponding to 0, 100, 200, 300 and 400 kg ha−1 of nitrogen (N) with supplementation of phosphorous (P) and potassium (K) as well as two control treatments - one with 300 kg ha–1 of N as OMF and the other with 300 kg ha−1 of N-urea + P and K. At harvest, the adopted design was a split-plot type with four replicates in a 7 × 3 factorial arrangement with seven treatments as the main plot and three sod cutting heights (9, 16 and 22 mm) as subplots. Nitrogen doses in the form of OMF influenced the percentage of ground cover (PGC) by turfgrass in both cycles. The N dose of 300 kg ha−1 formed the sod more quickly and provided the largest mass of roots and stolons and the highest sod tensile strength. The thinnest sod samples had faster regrowth and provided higher PGCs.
       
  • Soil physical indicators of management systems in traditional agricultural
           areas under manure application

    • Abstract: ABSTRACT Studies of the successive application of manure as fertilizer and its combined effect with long-term soil management systems are important to the identification of the interdependence of physical attributes. The aim of this study was to evaluate changes in the physical properties of a Rhodic Kandiudox under management systems employing successive applications of pig slurry and poultry litter, and select physical indicators that distinguish these systems using canonical discriminant analysis (CDA). The systems consisting of treatments including land use, management and the application time of organic fertilizers are described as follows: silage maize under no-tillage (NT-M7 years); silage maize under conventional tillage (CT-M20 years); annual pasture with chisel plowing (CP-P3 years); annual pasture with chisel plowing (CP-P15 years); perennial pasture without tillage (NT-PP20 years); and no-tillage yerba mate (NT-YM20 years) and were compared with native forest (NF) and native pasture (NP). Soil samples were collected from the layers at the following depths: 0.0-0.05, 0.05-0.10, and 0.10-0.20 m, and were analyzed for bulk density, porosity, aggregation, flocculation, penetration resistance, water availability and total clay content. Canonical discriminant analysis was an important tool in the study of physical indicators of soil quality. Organic fertilization, along with soil management, influences soil structure and its porosity. Total porosity was the most important physical property in the distinction of areas with management systems and application times of manure for the 0.0-0.05 and 0.10-0.20 m layers. Soil aeration and micropores differentiated areas in the 0.05-0.10 m layer. Animal trampling and machinery traffic were the main factors inducing compaction of this clayey soil.
       
 
 
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