The suspension of tumoral cells from Walker 256 were irradiated with doses of 2.500, 4.500, 5.000, 5.500 and 7.500 rad for determining the attenuation dose. The suspension of inactives tumoral cells were injected in rats for verifying the immunized effect...
National Technical Information Service (NTIS)
The main purpose of this work was to build a practical, versatile and low-cost solar radiometer, to measure simultaneously the global solar radiation, the fraction of solar radiation reflected by a surface and the net radiation of short wave. The developm...
The destruction of food by different organisms is described and methods of preventing this destruction are outlined and compared with the radiation method. A survey is made of the various sources available for food processing. (T.R.H.)
Energy Citations Database
The present paper examines some aspects of the direct and indirect biological radiation effects: pair formation, free radicals, superoxide ion, hydrogen peroxide, hydroxyl radical, oxygen singlet together with the endogen radioprotector mechanisms of orga...
The urbanization effects and their possible causes on the environmental gamma radiation levels, in an anomalous area, were studied. The field work was accomplished in Guarapari, located in the seacoast of the Brazilian state of Espirito Santo, which is ri...
This work illustrates the behavior of the various components in the radiation balance and two different parameters which are useful statistical and descriptive indexes of net and solar radiation over natural surfaces like the Amaxon tropical rain forest. ...
The absorption of solar radiation by the Earth is a function of astronomical parameters (height, distance from the Sun) and of terrestrial parameters (albedo, bio-albedo, latent heat). The distribution of ocean and land may induce a disequilibrium of the ...
A 36m by 150m section of a 150m by 150m plot in which sugar cane was planted was irrigated periodically over a 4 month period to maintain optimum water level. Field measurements of radiation temperature, soil moisture, and plant water content taken at dif...
The ELETROPAULO Electricity from Sao Paulo S/A covers 74 municipal district of the State with electric power, signifying 26% of the energy consumed in Brazil. This paper presents problems with the aquatic plants proliferation and the methods used for thei...
In December 1987, there was a very high fish mortality in Lake Acu, motivating concern in the regional authorities about the environment. The objective is a multitemporal analysis to evaluate the antropic action effects and some natural factors in the env...
The existing lakes in the fluvial plain of the Mearim River middle-low valley, are significant food producer areas to migratory birds. The objective is to characterize and evaluate the impact of the antropic action in this region, through LANDSAT/TM image...
Samples of styrene monomer were irradiated with gamma rays from a sup(60)Co source, with doses in the range of zero to 32600 Gray (Gy). Viscosity analysis performed by using the method of Stokes showed an increase in the viscosity of the material. This re...
Samples of brazilian calcite, exposed to gamma radiation in laboratory and heated at constant rate of 2.7(sup 0) C/s, showed three glow peaks at 150, 250 and 350 (sup 0)C in their thermoluminescent emission curves. The analysis of these peaks, using diffe...
This paper was aimed at studying the influence of gamma rays dose rate over the radiosensitivity of Sitophilus oryzae (L.), S. zeamais Mots., Rhyzopertha dominica (F.), Zabrotes subfasciatus (Boh.) and Ceratitis capitata Wied. From the results obtained it...
In the present research we had as a fundamental objective to analyse the non-thermal effects of the laser polarized light in biological tissues. These effects were performed with low power laser output. The theoretical procedure consisted in looking for a...
A study was performed on rats to verify v the effects of ionizing radiation on the structure of the parotid glands of young rats. Thirty twenty five-day old rats - Rattus norvegicus, albinus, Holtzman - with a medium body weight of 54,20 g were equally di...
Polycarbonates (PC) are used in different industrial applications due to their excellent dielectric characteristics, impact resistance, and high temperature resistance. In some of these applications, the polycarbonates are exposed to gamma radiation which...
It is know that the ionizing radiation is able to change significantly the biological and antigenic response of a toxin depending of the dose and irradiation's conditions, probable by structural alterations caused by radiation. In this work, the crotoxin,...
The effects of the increase in the gamma radiation ((sup 60) Co) doses on different phases of the evolutional cycle of Corcyra cephalonica (Stainton, 1865) (Lepidoptera Pyraliade) are studied. A cobalt 60 source type gamma beam 650 was used and the activi...
Lethal effects were studied for the egg, larval and pupal stages as well as sterilization of adults of Sitophilus oryzae (L.) by the application of gamma radiation. Irradiation of pupae with an estimated dosis of 7887 (+-) 158 rad inhibits adult emergency...
Some aspects of the effects of the ionizing radiation on the embryo and on the genetical material of Biomphalaria glabrata (Mollusca: Gastropoda) are presented. The embryos weresubmitted at various stages of development to doses of 5,10,15,20 and 25 Gy of...
To study the effect of gamma irradiation on deltametrina, malathion and fenitrothion, the saturated filter paper technique was used. The filter paper, saturated with the products, was submitted to increasing doses of gamma radiation - 10, 20 and 40 kGu at...
In order to study the effects of (sup 6) (sup 0) Co gamma radiation on crystalline proteins an in vitro system was set up. For that, aqueous solutions from bovine crystalline were used irradiated with 0, 5.000, 10.000, 15.000, 20.000 and 25.000 Gy. The tr...
The field scattered by a general surface of revolution, when illuminated with linearly, circularly, or elliptically polarized feeds, can be calculated by the physical optics method, which consists of the integration of the currents induced in the reflecto...
The radiation doses of disinfestation and conservation for mangoes of Haden and Keitt varieties are described, including experimental data with different doses and different time of irradiation. (author). (Atomindex citation 22:080388)
N,N' -dimethyl acrylamide (DMAA) graft copolymerization onto polyethylene films was carried out, using a organic solvent as a reaction medium and gamma rays from a (sup 60) Co source for surface activation. Thermal analysis revealed the crystallinity and ...
The work presented in the thesis concerns the radiation of moving charges in material media. The first chapter establishes certain fundamental results and methodological procedures, in the context of the electrodynamics of Moving Media and the Theory of R...
This paper evaluates the chemical characteristics and the mangoes sensorial quality after treatments with different doses of gamma radiation and during a period of storage, with constant conditions of temperature and relative humidity. (author). (Atominde...
Gamma irradiation was used to treat: eggs at different ages of C. capitata, third instar larvae of C. capitata, A. fraterculus and A. obliqua, papayas infested with a known number of C. capitata eggs; papayas and mangoes with C. capitata and A. fraterculu...
The effects of gamma radiation for prolonging commercial life of Haden mangoes, giving data about the viability of the method are described. (author). (Atomindex citation 22:080387)
Genetical analysis procedures of the cobalt 60 gamma radiation effects in the induced mutations in quantitative characters of Caupi BR-1 Poty. The following characters were evaluated: day to first flower (FI), number of pods per plant (NVP), pod lenght (C...
The gamma radiation doses to attend quarantine requirements of importing countries, by disinfecting mango fruits from Ceratitis capitata (Wied., 1824), Anastrepha Fraterculus (Wied., 1830) and Anastrepha Obliqua (Macquart, 1835) is studied. An increase of...
The Pocos de Caldas Plateau, Minas Gerais State one of the biggest alkaline intrusions in the world. This study has shown the expected value for the mean annual radiation exposure due to the agricultural activities ranges from 6 up to 14 mSv/a depending o...
Secondary cosmic rays between .3 MeV and 5 MeV were measured using a NaI gamma-ray spectrometer, an analog to digital converter, and a magnetic tape recorder carried on board a Sabreliner, during flights between Campinas-Brasilia-Manaus-Boa Vista at altit...
A gamma bean 650 cobalt-60 source was utilized for irradiation (0; 10; 50; 100; 200; 300; 400; 500; 750 and 1000 Gy) of fresh ripe fruits artificially interested by immature stages of Ceratitis capitata to determine the sterilizing and lethal doses. The s...
The associated mutagenesis and the interactions with physical agents in order to potencialize its biological effects are studied. The induction of mutation in bacterias due to photodynamic action of methylene blue is presented as well as the induction of ...
BackgroundBefore coronary evaluation by modern imaging techniques was feasible, premorbid diagnoses of coronary artery anomalies (CAAs) were usually made fortuitously by invasive coronary angiography (ICA). However, this technique is limited by its invasive and projectional nature. Coronary magnetic resonance angiography (CMRA) and multi-slice computed tomography (MSCT) broadened clinical ...
PubMed Central
The reactions of the radicals formed by radiolytic decomposition of water (OH, e(1-)(sub aq) and H) with purines were studied by the combined methods of pulse radiolysis with optical and conductometric detection and gamma irradiation followed by product a...
The aspects of a radioprotection program to be implanted in hospitals to cases of medical treatment to external and internal contamined people are presented. It is based in the experience acquired in the coordination of radioprotection of the Marcilio Dia...
This work presents a study on the effect of subreflector support members of Cassegrain antennas using the theory of scattering by cylindrical structures. Expression for the surface current densities and arbitrary cross sections cylinders are developed, an...
The amplified emission of electron cyclotron radiation near the fundamental frequency from an inhomogeneous, anisotropic plasma slab is investigated in a linear theory. Plasma polarization effects are consistently included. Expressions are developed in th...
