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[en] The study on the disinfestation of Colombian export fruits by irradiation was carried out in the context of a big national plan directed to diversify agricultural production and exports. The final objective is to establish the most important technical parameters of the use of ionizing radiation as a quarantine treatment. In addition, an economic feasibility study for an irradiation plant in Colombia shows that the source size will be 400,000 Ci of Co-60, and the total cost of the plant near to US $2,000,000
[en] The conventional process to produce biodiesel involves the presence of homogeneous basic catalysts. However, these catalysts have disadvantages associated to the need of purification steps, which increase the cost of the final product and generate pollution problems caused by the effluents. This paper compares different homogeneous and heterogeneous catalysts for the biodiesel production from palm oil. For this, heterogeneous catalysts supported on alumina were prepared and characterized by nitrogen adsorption, scanning electron microscopy, energy dispersive X ray spectroscopy and X ray diffraction. Transesterification of palm oil with methanol was accomplished at 60 celsius degrade and one hour, varying methanol/oil ratio, the type of catalyst and its concentration. Yields of the reaction and purity of the so obtained biodiesel were evaluated. Comparing the catalysts performance, based on the amount, was found that sodium methoxide (CH3 ONa) and potassium carbonate supported on alumina (K2 CO3 /Al2O3) were the catalysts that give the higher purity of biodiesel (96.8 and 95.85% respectively). When was determined the active site quality, by dividing the performance by each mole of active sites, it was found that calcined Na2SO4 /Al2O3 has the most active sites.
[en] This is first study performed in the Gamma Facility of the Instituto de Asuntos Nucleares, in Bogota, Colombia, related to the Food Irradiation Programme. The study was made with: Parda Pastusa, ICA Guantiva, and ICA Purace, selected as the most important varieties of colombian potatoes. A complete study prior to the irradiation exposure was made in order to determine the optimum irradiation package. Different dose treatments, chemical and physical changes and organoleptic tests, were studied in this work. The work was performed in the early 1980s
[en] The present study was performed in the Gamma Facility of the Institute of Nuclear Affairs in Bogota, in order to preserve shrimps (Xiphonenaeus Riveti) and Bagre fish (Pseudoplatystoma Fasciatum), species, to determine the best conditions and to obtain general information that would be necessary when the technoeconomic feasibility studies will be done. The treatment doses were 0.0, 1.0 and 2.0 KGy and 0.0, 1.5 and 3.0 KGy for the shrimps and the Bagre fish respectively. Physico-chemical and microbiological analysis and an organoleptic test were realized to demonstrate the goodness of this technology, just beginning in Colombia. The tolerance limits obtained for the shrimps were: 10 microorg/g. 040 mg NTMA/100g. 40 mg NBVT/100g. For the Bagre fish: 107 microorg/g. 12 mg NBVT. The shelf life was extended 11 and 5 days for the shrimps and Bagre fish for doses of 2.0 and 3.0 KGy respectively. The results could be improved with the improvement of the fishing and handling practices existing today
[en] On the thirtieth anniversary celebration of the ''Instituto de Asuntos Nucleares'', a historical review of its activities has been made, emphasizing on its politics of development, technological and scientific advances, including the goals and accomplishments attained for the uses and applications of nuclear technology in Colombia. This includes the technical assistance which is being provided by International Organizations. National and international influences are shown for each one of the technical areas: agricultural applications, industrial applications and metallurgy, biochemistry and radiopharmacy, development process, nuclear electronics, solar and non-conventional energies, gamma facility, nuclear physics, hydrology, raw materials, chemistry, health radiophysics, reactor, nuclear documentation and information center and administration