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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 653 (1992), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: The Governments of the Provinces located in Patagonia, Argentina, promote the intensive breeding of salmonids in the Andean Patagonian region. Although annual production is low (450 ton ha–1 year–1), some effects are significant. Waste produced by salmonid breeding (feed losses, faeces and excretion) increases nutrient and organic matter concentrations, which cause modifications of water quality, sediments and biota. A consequent risk is the elevation of eutrophication levels. Possible changes in water composition, sediments, algae and wild fish populations were studied. Sites affected by fish farming showed increased nutrient concentration, and phytoplankton and periphyton biomass. Chlorophyll a was similar at both sites (affected and unaffected by fish farm sites). Sediments clearly reflect fish farm waste inputs: total phosphorus and organic matter increased 12-fold and fourfold, respectively. The species present in the gill-net catches were the autochthonous Percichthys trucha, Odontesthes hatcheri, Diplomystes viedmensis, and the introduced salmonids Oncorhynchus mykiss, Salmo trutta, Salmo salar sebago and Salvelinus fontinalis. About 50% of the total catch was salmonids. A major portion of the catch per unit weight was composed of rainbow trout, followed by perch. The catch per unit weight obtained for this reservoir agrees with the range of values previously determined (Quiros 1990) for Patagonian reservoirs. Compared with previous studies by Freyre et al. (1991), a variation in catch composition exists. This consists mainly of an increase in the numbers and condition of O. mykiss and a decrease in P. trucha. Presence of fish that escaped from hatcheries, recognizable by their eroded fins, was observed; particularly in a sampling station near the fish cage systems. Variations in catches could be caused by cyclical changes in fish populations (Wooton 1991), by direct and indirect effects of intensive fish farming, or by a combination of both events, and can only be understood through long-term studies of catch variation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Tropical animal health and production 17 (1985), S. 82-82 
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Tropical animal health and production 17 (1985), S. 9-18 
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La prévalence sérologique de l'ánaplasmose et de la babésiose bovines dans la région centre-ouest du Vénézuela a été déterminée par les méthodes indirectes de l'immunofluorescence (IF) et de l'agglutination au latex (AL). Les taux de prévalence d'Anaplasma marginale d'après les tests IF et AL sont respectivement de 57, 7 p. 100 et de 48,6 p. 100 chez les bovines, quel que soit l'âge ou la race. La prévalence respective du test IF vis-à-vis deB. bigemina et deB. bovis est de 78,2 p. 100 et de 38,8 p. 100. Le test de l'agglutination au latex dont la spécificité est limitée au genreBabesia spp a montré que 61,4 p. 100 des animaux testés avaient une sérologie positive vis-à-vis des parasitesBabesia. Anaplasma marginale etB. bigemina ont été décelés dans des frottis de sang périphérique chez 21,1 p. 100 et 7,5 p. 100 respectivement des bovins testés. Un suivi dans le temps de l'activité des anticorps et de l'incidence de la parasitémie vis-à-vis des infections àAnaplasma etBabesia a été pratiqué dans deux groupes de veaux depuis leur naissance jusqu'à l'âge de 7 mois. Les animaux contractent généralement l'infection entre l'âge de 3 et 4 mois, période qui succède au déclin des taux d'anticorps colostraux. Ces données de séroépidémiologie sont prises en compte dans l'établissement de campagne de vaccination contre l'anaplasmose et la babesiose.
    Abstract: Resumen Se determinó la prevalencia serológica de anaplasmosis y babesiosis bovina, en la región central occidental de Venezuela, utilizando la prueba de immunofluorescencia indirecta PIFI) y la aglutinación del latex (PAL). Las ratas de prevalencia PIFI y PAL paraAnaplasma marginale fueron 57·7% y 48·6% respectivamente, en ganado de todas las edades y razas. Las respectivas prevalencias de la actividad de PIFI, pa paraBabesia bigemina yB. bovis fue 78·2% y 38·8%. La prueba PAL, ú únicamente especifica paraBabesia spp. reveló que el 61·4% de los animales analizados fueron serológicamente positivos paraBabesia. Se detectóAnaplasma marginale yB. bigemina en la sangre periférica de 21·1% y 7·5% respectivamente, del ganado analizado. Se llevó a cabo, un reconocimiento longitudinal, de la actividad de los anticuerpos e incidencia de parasitémia, paraAnaplasma yBabesia, en dos grupos de terneros, desde el nacimiento hasta los siete meses de vida. Los animales experimentaron las primeras infecciones, entre los tres y cuatro meses de vida, el periodo con posterioridad a la pérdida de inmunidad materna.
    Notes: Summary The serological prevalence of bovine anaplasmosis and babesiosis in the Centro-Occidental region of Venezuela was determined using the indirect fluorescent antibody (IFA) and latex agglutination (LAT) tests.Anaplasma marginale IFA and LAT prevalence rates were 57·7 and 48·6% respectively for cattle of all ages and breeds. The respective prevalence of IFA activity toB. bigemina andB. bovis was 78·2 and 38·8%. The LAT test specific only forBabesia spp. revealed that 61·4% of the animals tested were serologically positive forBabesia parasites.Anaplasma marginale andB. bigemina organisms were detected in peripheral blood smears of 21·1 and 7·5% respectively of cattle surveyed. A longitudinal survey of antibody activity and incidence of parasitaemia forAnaplasma andBabesia infections was conducted in two groups of calves from their birth to seven months of age. The animals generally experienced infections between three and four months of age the period subsequent to decline in colostral antibody levels. Seroepidemiological data are considered in the formulation of proposed vaccination regimens for anaplasmosis and babesiosis.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 45 (1994), S. 387-391 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Beschreibung der Korrosionsprodukte auf Kupferstichplatten nach 200jähriger Exposition in AußenatmosphäreDie vorliegende Arbeit beschreibt die Korrosionsprodukte auf sechs chalkographischen Platten des 18. Jahrhunderts aus dem staatlichen Kupferstichkabinett der Königlichen Akademie für Schöne Künste von San Fernando in Madrid. Als Untersuchungsverfahren wurden die Röntgenbeugung, die Infrarotspektroskopie, die Augerspektroskopie und die Röntgenphotoelektronenspektroskopie eingesetzt.Als Hauptbestandteile wurden Malachit CuCO3 · Cu(OH)2, Atakamit CuCl2 · 3Cu(OH)2, Nantochit CuCl, Tenorit CuO und Cuprit Cu2O nachgewiesen. Letzteres ist Hauptbestandteil in den glatten Bereichen der Kupfeiplatten mit Anlauffilmen. Die Stärke dieser Anlauffilme beträgt rund 10-15 Å.
    Notes: This work studies the characterization of corrosion products formed on six eighteenth century chalcographic copper plates preserved in the National Chalcography Collection in the San Fernando Royal Academy of Fine Arts in Madrid. The experimental methods used were X-ray diffraction analysis (XRDA), Infrared spectroscopy (IRS), Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS).The main compounds found were malachite CuCO3 · Cu(OH)2, atacamite CuCl2· 3Cu(OH)2, nantokite CuCl, tenorite CuO, and cuprite Cu2O. Cuprite is the main compound found on the smooth areas of chalcographic plates, forming tarnish films. The thickness of the tarnish films is approximately 10-15 Å.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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