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The purpose of this study was to determine how storage time (0–90 days) and temperature (10, 12 and 14C) affect the functional properties of wheat and corn grains. Functional properties such as grain moisture content, grain geometry, dry matter, crude protein and fiber, thousand grain weight, bulk density, angles of internal friction and repose, and static coefficient of friction were determined for stored wheat and corn after different storage times and temperatures. The wheat and corn were stored under typical storage conditions and were observed for changes in their functional properties during the 90 days of storage. The results showed that the examined functional properties differed significantly between the storage conditions depending on the storage times and temperatures. For the storage conditions, the optimum temperature was 10C because the minimum losses were observed at this temperature. Practical Applications Little is known about the functional properties of the stored wheat and corn relative to their storage conditions. Recently, there has been an increasing interest by food industry and producers to assure consumers on the presevation of their wheat and corn foods. These research results demonstrated that the internal climatic conditions should be kept under constant control to provide the requirements of the stored grains, whichever storage type is used.

The objective of this study was to investigate some physical and mechanical properties of Osmancık-97 rice variety widespread cultivated in Turkey in order to determine needed designing parameters for handling and storage facilities. In this study, some physical and mechanical properties were evaluated as a function of moisture content in the range of 10-14% d.b. Length, width, thickness, arithmetic and geometric mean diameter ranged from 8.27 to 9.01 mm, 3.10 to 3.48 mm, 2.05 to 2.26 mm, 4.47 to 4.92 mm, 3.75 to 4.13 mm, respectively as the moisture content increased; sphericity, grain volume, surface area, true density and porosity increased from 43 to 45%, 130.97 to 160.32 mm 3 , 38.68 to 46.91 mm 2 , 939.0 to 962.1 kg m -3 , and 36.61 to 41.97%; bulk density decreased from 595.5 to 560.5 kg m -3 ; the angle of internal friction increased linearly from 29.70°to 32.53°with the increase of moisture content; the static coefficient of friction increased from 0.764 to 0.972, 0.524 to 0.702 and 0.576 to 0.764 for concrete, galvanized steel and wood surfaces, respectively; the poisson ratio and pressure ratio decreased linearly with the increase of moisture content. The data obtained from the study will be useful in the structural design of rice bin to calculate loads on bins from the stored material.Additional key words: angle of internal friction, bulk density, porosity, pressure ratio. ResumenEfecto del contenido en humedad sobre las propiedades físicas y mecánicas del arroz (Oryza sativa L.)El objetivo de este estudio fue investigar algunas propiedades físicas y mecánicas de la variedad de arroz Osmancık-97, ampliamente cultivada en Turquía, con el fin de determinar el diseño de los parámetros necesarios para la manipulación y almacenamiento. En este estudio se evaluaron algunas propiedades físicas y mecánicas en función del contenido de humedad en el rango de 10-14% (base seca). Según aumentaba el contenido de humedad, la longitud, anchura, grosor, media aritmética y media geométrica del diámetro variaron de 8,27 a 9,01 mm, 3,10 a 3,48 mm, 2,05 a 2,26 mm, 4,47 a 4,92 mm, 3,75 a 4,13 mm, respectivamente; la esfericidad, volumen del grano, superficie, densidad real y porosidad aumentaron de 43 a 45%, de 130,97 a 160,32 mm 3 , 38,68 a 46,91 mm 2 , 939,0 a 962,1 kg m -3 , y 36,61 a 41,97%; la densidad aparente disminuyó de 595,5 a 560,5 kg m -3 ; el ángulo de fricción interna aumentó linealmente de 29,70°a 32,530°; el coeficiente de fricción estática aumentó de 0,764 a 0,972, 0,524 a 0,702 y 0,576 a 0,764 para el hormigón, el acero galvanizado y superficies de madera, respectivamente; el coeficiente de Poisson y la relación de la presión disminuyeron linealmente con el aumento del contenido de humedad. Los datos obtenidos en este estudio serán útiles en el diseño estructural de los contenedores de arroz para calcular las cargas en los contenedores a partir del material almacenado.Palabras clave adicionales: ángulo de fricción interna, densidad aparente, porosidad, ratio de presión.* Corresponding author: hk...

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