Relação entre a mancha parda (Bipolaris oryzae) na folha bandeira e a mancha de grão em genótipos de arroz.

A mancha de grãos é causada por um complexo de patógenos e vem sendo considerada como um dos principais problemas no cultivo de arroz. O objetivo do trabalho foi investigar a relação entre a resistência à mancha parda na folha bandeira e a mancha de grãos em condições controladas de casa de vegetação.Apresentação oral - graduação

Crescimento e acúmulo de macronutrientes na cultura da cebola em Baraúna (RN) e Petrolina (PE).

Com o objetivo de avaliar o crescimento e o acúmulo de nutrientes por cultivares de cebola experimentos foram desenvolvidos na estação experimental de Bebedouro (Petrolina, PE) pertencente à Embrapa Semiárido, no período de maio a outubro de 2009 e em Baraúna, RN, em área comercial, no período de junho a outubro de 2009. O delineamento utilizado em cada experimento foi em blocos casualizados completos, com quatro repetições em esquema fatorial 2 x 6. Os tratamentos resultaram da combinação de duas cultivares de cebola (IPA 11 e Texas Grano 502) e seis épocas de coleta (15, 30, 45, 60, 75 e 90 DAT). Em cada coleta foram utilizadas seis plantas por repetição. A cebola, cultivares IPA 11 e Texas Grano, apresentou crescimento inicial lento intensificando-o a partir dos 30 dias após o transplantio. Maiores incrementos na matéria seca total, da parte aérea e do bulbo, ocorreram no período de 60 a 75 DAT. Os nutrientes foram absorvidos pela cebola na seguinte ordem: Ca > K > N > Mg > P e Ca > N > K > Mg > P para ?Texas Grano 502? e ?IPA 11? em Petrolina e K > Ca > N > Mg > P e N > K > Ca > Mg > P para Texas Grano 502 e IPA 11 em Baraúna. As cultivares Texas Grano 502 e IPA 11 exportaram mais nutrientes em Baraúna

Relação entre a mancha parda na folha bandeira e a mancha de grão em genótipos de arroz.

O objetivo do trabalho foi investigar a relação entre a resistência à mancha parda em folha bandeira e mancha de grãos causada por Bipolaris oryzae em condições controladas de casa de vegetação

Apatite formation on calcined kaolin-white Portland cement geopolymer

In this study, calcined kaolin–white Portland cement geopolymerwas investigated for use as biomaterial. Sodiumhydroxide and sodium silicate were used as activators. In vitro test was performed with simulated body fluid (SBF) for bioactivity characterization. The formation of hydroxyapatite bio-layer on the 28-day soaked samples surface was tested using SEM, EDS and XRD analyses. The results showed that the morphology of hydroxyapatite was affected by the source material composition, alkali concentration and curing temperature. The calcined kaolin–white Portland cement geopolymer with relatively high compressive strength could be fabricated for use as biomaterial. The mix with 50% white Portland cement and 50% calcined kaolin had 28-day compressive strength of 59.0 MPa and the hydroxyapatite bio-layer on the 28-day soaked sample surface was clearly evident.This work was financially supported by the Thailand Research Fund (TRF) and Khon Kaen University under the TRF-Royal Golden Jubilee Ph.D. program (Grant No. PHD/0143/2554) and TRF-Senior Research Scholar (Grant No. RTA5780004)

Resistência à queima da bainha em genótipos de arroz em condições de casa de vegetação.

O objetivo deste estudo foi identificar possíveis fontes de resistência à queima da bainha em genótipos de arroz visando oferecer subsídios ao programa de melhoramento genético de arroz

Bioactivity enhancement of calcined kaolin geopolymer with CaCl2 treatment

This paper reports that surface treatment with CaCl2 enhances the bioactivity of a calcined kaolin geopolymer. Calcined kaolin, NaOH solution, sodium silicate solution, and heat curing were used to form geopolymer pastes. A soaked-treatment method was applied to the geopolymer samples using CaCl2 solution as the ion exchange agent. The bioactivity of the material was determined by the simulated body fluid (SBF) in vitro testing method. Scanning electron microscope images showed a dense apatite formation on the treated geopolymer surface after SBF immersion for only 3 days. The CaCl2 treatment promoted compressive strength and enhanced bioactivity by accelerating apatite precipitation and slowing down the rise in pH.This work was financially supported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University; and Khon Kaen University and the Thailand Research Fund (TRF) under the TRF-Royal Golden Jubilee Ph. D. program (Grant no. PHD/0143/2554); Post-doctoral training program (Grant no. 58110), Graduate school, Khon Kaen University and TRF Senior Research Scholar Contract No. RTA5780004.info:eu-repo/semantics/publishedVersio

Avaliação de famílias de cana-de-açúcar quanto à eficiência na fixação biológica do nitrogênio.

Com o objetivo de selecionar as famílias de cana-de-açúcar mais responsivas à fixação biológica do nitrogênio foram avaliadas 10 famílias obtidas de cruzamentos biparentais inoculadas com bactérias diazotróficas endofíticas. Utilizou-se a metodologia REML/BLUP para obtenção dos valores genotípicos e para identificar as elhores famílias. As características diâmetro do colmo, número de perfilhos e altura de plantas foram determinadas como características promissoras para seleção de famílias responsivas à fixação biológica do nitrogênio. Os cruzamentos RB 813804 x RB 72910; RB 961003 x RB 931011; RB 98710 x RB 72454; CO 62175 x RB 72454; RB 92579 x RB 86 3129, apresentaram valores genotípicos superiores à média experimental. Conclui-se que para o conjunto de famílias estudadas existem clones promissores e responsivos à fixação biológica do nitrogênio

Assessing the feasibility of impregnating phase change materials in lightweight aggregate for development of thermal energy storage systems

This paper assesses the feasibility of impregnation/encasement of phase change materials (PCMs) in lightweight aggregates (LWAs). An impregnation process was adopted to carry out the encasement study of two different PCMs in four different LWAs. The leakage of the impregnated/encased PCMs was studied when they were submitted to freeze/thawing and oven drying tests, separately. The results confirmed that, the impregnation/encasement method is effective with respect to the large thermal energy storage density, and can be suitable for applications were PCMs cannot be incorporated directly such as asphalt road pavements.The authors acknowledge the funding given by Centre for Coordination and Regional Development Committee (CCDR-C) through the research project CENTRO-07-ST24_FEDER-002020 "Environmentally-Friendly Aeronautical Transport Systems Integrated Program (EFATRAS)", http://efatrasubi.wordpress.com. Supply of Expanded Clay materials by ARGEX - Argila Expandida, S.A and Cork materials by Sofalca - Sociedade Central de Productos de Cortica, Lda are also acknowledged

Relação de cor instrumental e sensorial de feijões (Phaseolus vulgaris L.) tipo carioca armazenados.

Objetivou-se comparar cor e intenção de compra de seis genótipos distintos de feijão tipo carioca durante armazenamento por seis meses a temperatura ambiente. Feijões das cultivares Pérola, BRS-MG Madrepérola, BRS Estilo, CNFC 10467, BRS Pontal e uma linhagem canadense Pinto Beans foram obtidos na Embrapa Arroz e Feijão na safra de 2013/2014

Density and distribution of Xylocopa nests (Hymenoptera: Apidae) in Caatinga areas in the surroundings of Passion fruit crops.

Due to their importance as pollinators of many plant species, this study aimed to know the nest density, spatial distribution, and nesting substrates used by Xylocopa species in the Caatinga, a xerophilous vegetation f Northeastern Brazil. Three areas of Caatinga in the surroundings of passion fruit crops were sampled. The bee species found in these areas were Xylocopa grisescens Lepeletier and Xylocopa frontalis (Olivier). All nests were in Commiphora leptophloeos (Burseraceae) trees (n=113). Phytosociological analysis showed that this tree species presented the highest absolute density (212.5 individuals/ha) and index of importance value (52.7). The distribution pattern of the C. leptophloeos was aggregated. The nests were located in dead and dried branches with an average diameter of 5.3±2.0 cm (n=43). The mean number of nests/tree was 3.1± 2.8 (n=113). The less disturbed area showed 6.7 nests/ha and 4.2 nests/tree. In the disturbed areas, 0.9 nests/ha and 2.4 to 2.7 nests/tree were observed. The availability of substrate for nesting in the studied areas and its importance as a limiting factor for nesting are discusse