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  • 1
    Electronic Resource
    Electronic Resource
    Interactions of microorganisms isolated from gilthead sea bream, Sparus aurata L., on Vibrio harveyi, a pathogen of farmed Senegalese sole, Solea senegalensis (Kaup) (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 28 (2005), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Four bacterial isolates from farmed gilthead sea bream, Sparus aurata, included in a previous study as members of the Vibrionaceae and Pseudomonodaceae and the genus Micrococcus, have been evaluated for their adhesive ability to skin and intestinal mucus of farmed Senegalese sole, Solea senegalensis, and their antagonistic effect on Vibrio harveyi, a pathogen of sole. These isolates showed higher adhesion to sole mucus than the pathogenic strains of V. harveyi assayed. Only two of the isolates showed antagonistic activity to V. harveyi. Interactions of the four isolates with V. harveyi in respect of adhesion to skin and intestinal mucus under exclusion, competition and displacement conditions were studied. Three isolates were able to reduce the attachment to skin and intestinal sole mucus of a pathogenic strain of V. harveyi under displacement and exclusion conditions, but not under competition conditions. The in vivo probiotic potential of isolate Pdp11 was assessed by oral administration followed by challenge with the pathogenic V. harveyi strain Lg14/00. A group of 50 Senegalese sole received a commercial diet supplemented with 108 cfu g−1 of lyophilized Lg14/00 for 15 days. A second group of fish received a non-supplemented commercial diet. After challenge the mortality of the fish receiving the diet supplemented with the potential probiotic isolate was significantly lower than that in the fish receiving the non-supplemented commercial diet. This study has shown that the ability to interfere with attachment of pathogens, as well as the adhesion to host surfaces, are suitable criteria for selection of candidate probiotics for use in the culture of Senegalese sole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.2005.00657.x
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  • 2
    Electronic Resource
    Electronic Resource
    Survival against exogenous hydrogen peroxide of Photobacterium damselae subsp. piscicida under different culture conditions (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 26 (2003), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.2003.00455.x
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  • 3
    Electronic Resource
    Electronic Resource
    Effectiveness of a divalent vaccine for sole, Solea senegalensis (Kaup), against Vibrio harveyi and Photobacterium damselae subsp. piscicida (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 28 (2005), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The protection of cultured sole, Solea senegalensis, against Vibrio harveyi and Photobacterium damselae subsp. piscicida was evaluated following the use of a divalent vaccine prepared with formalized whole cells and extracellular products of virulent strains of both pathogenic microorganisms and administered by the immersion route. Two prolonged immersions of 5–10 g fish in the divalent bacterin at a 1-month interval gave high levels of protection similar to those obtained when the respective monovalent vaccines were administered by the intraperitoneal route [relative percentage of survival (RPS) values 〉70%], which indicates that the former procedure can be a useful strategy with small fish. The high protection afforded by the divalent vaccine in sole lasted for 4 months after which the RPS values against both pathogens decreased significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.2004.00597.x
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  • 4
    Electronic Resource
    Electronic Resource
    The analysis of ruthenium catalysts by photon-induced X-ray fluorescence using a microcomputer for data acquisition and analysis (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 89 (1985), S. 455-463 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An improved method for the determination of ruthenium in catalytic materials based on a relative fluorescence ratio factor is presented. This method employs a thin-film technique and an internal standard technique to minimize absorption and enchancement effects. The samples and standards were fluorescent with a109Cd (7 mCi) annular source for 200 seconds and the data were collected and analyzed with an Apple II+ micro computer. Precision (total variation) for typical ruthenium catalysts in the range of 1–5% ruthenium was about 2%. Finally, the concentration of ruthenium in six commercial catalysts was determined for both alumina and carbon supports.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040609
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  • 5
    Electronic Resource
    Electronic Resource
    A study of the source-sample-detector geometries for an annular americium-241 source and a planar pure germanium detector for flat-disc samples (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 120 (1988), S. 13-20 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The optimum sample size and arrangement for flat-disc samples employing a commercial annular241Am radioactive source and a planar pure germanium detector were studied for quantitative X-ray fluorescence analysis. The effective overall sample areas at different heights (distances between the source and sample) were estimated simply by drawing to scale the source-sample-detector arrangement and its accessories. The effective sample areas were also determined experimentally with standard samples and aluminium shields. The rough estimate was in good agreement with the experimental values for the effective overall areas. Finally, data concerning the shift of the centroid of the Am-scatter peak due to the 59.6 keV gamma-rays from 48.7 to 52.0 keV, with its respective resolution for the different heights, are discussed with respect to the characteristic rare-earth element X-rays in this energy region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037846
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  • 6
    Electronic Resource
    Electronic Resource
    Application of an Apple IIe microprocessor for data acquisition and analysis in instrumental neutron activation analysis with a low energy photon detector (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 102 (1986), S. 377-384 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The determination of thirteen elements, eleven rare-earth elements (La, Ce, Nd, Sm, Eu, Gd, Tb, Ho, Tm, Tb and Lu), thorium and uranium were performed by instrumental neutron activation analysis for four geological reference materials (G-2, AGV-1, GSP-1 and SY-2) as well as our laboratory rare-earth standard. The analyses were performed using a low energy photon detector coupled to an Apple IIe microprocessor employed as a multichannel analyzer not only to collect the data but also for data analysis. Finally, based on this work we have proposed a simple, rapid routine method for the determination of eleven rare-earth elements, thorium and uranium in geological materials employing IVIC's RV-1 nuclear reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02047912
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  • 7
    Electronic Resource
    Electronic Resource
    A simple preparation of calibration curve standards of134Cs and137Cs by serial dilution of a standard reference material (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 140 (1990), S. 331-340 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Two sets of calibration standards for134Cs and137Cs were prepared by small serial dilution of a natural matrix standard reference material, IAEA-154 whey powder. The first set was intended to screen imported milk powders which were suspected to be contaminated with134Cs and137Cs. Therefore the concentration range of the calibration standards were about 40–400 Bq/kg. The precision of the preparation of the standard with about 7 Bq/kg of134Cs and 39 Bq/kg of137Cs at measurement time was 7.4% and 3.2%, respectively. The preparation of a similar standard by spiking the matrix with radioisotope solutions resulted in a poorer precision, about double that of the former technique. The other set of calibration standards was prepared to measure the environmental levels of137Cs in commercial Venezuelan milk powders. Their concentration ranged from 3–10 Bq/kg of137Cs. The accuracy of these calibration curves was checked by using IAEA-152 and A-14 milk powders. Their measured values were in good agreement with their certified values. Finally, it is shown that these preparation techniques by serial dilution of a standard reference material were simple, rapid, precise, accurate and cost-effective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039505
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  • 8
    Electronic Resource
    Electronic Resource
    Environmental radioactivity at the Venezualan Institute for Scientific Research (IVIC) (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 220 (1997), S. 59-64 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concentration of137Cs, potassium, thorium and uranium for 6 monitoring sites and 32 other sites at the Venezuelan Institute for Scientific Research (IVIC) were presented, as well as, the estimated air dose and exposure rates for each site. The concentration of137Cs was found to be much higher at many sites at IVIC in respect to the average estimated value of137Cs in Venezuela. But, this was determined to be due to a natural cause, the cloud forest which surrounds the higher elevations. The values of potassium, thorium and uranium were compared to values from other parts of northern Venezuela and were found to agree for sites at similar elevations. They were also shown to be about two to three times higher than global estimates. Thus, the air dose and exposure rates were correspondingly two to three times higher too, but the annual dose from the primordial radionuclides in the soil was estimated to be less than 0.1 mSv, which is considered negligible for health risks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035348
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  • 9
    Electronic Resource
    Electronic Resource
    Determination and distribution of137Cs in mosses from three Venezuelan cloud forests (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 231 (1998), S. 139-142 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The activity of137Cs was determined in mosses and their surrounding soils in three Venezuelan cloud forests. The concentration of137Cs in both the mosses and their respective soils were correlated with elevation (m.a.s.l.). This relationship was the result of the cloud forest effect, no direct deposition by condensation below the base of the clouds and increasing deposition of137Cs with the density of the clouds. The ratio of the activity of137Cs in the mosses to their surrounding soils was in general the same for sites near the top of the mountains, but the ratio at the Altos de pipe location was 3.5 times higher than that of the La Sierra mountain. This was explained by the difference in the water content of the surface and the top soil layer. It was concluded that the137Cs measured in the mosses was from the soil effect rather than new deposition of137Cs in the last three years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02388020
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  • 10
    Electronic Resource
    Electronic Resource
    Shift of the centroid of the Co Kα peak of Co3O4 converted from CoCO3 by various calcination parameters (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 14 (1985), S. 192-194 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The calcination of CoCO3 in air results in Co3O4 with particle sizes depending on the heating temperature: the lower the temperature, the smaller is the particle size. It was previously reported that the centroid of the Co Kα peak shifted greatly (〉500 eV) when the product (Co3O4) was formed by different calcination temperatures between 200 and 700°C. In the work, attempts were made to reproduce these results by using not only variable temperature but also variable time, and determined the centroid with a high-resolution Si(Li) detector rather than a scintillation counter. The results showed the shifts to be about ten times smaller than previously reported. The shift of the Co Kα peak centroid has been estimated to be less than 30 eV.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300140411
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