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    Wyświetlanie 1-6 z 6
    Tytuł:
    Endotoxin concentration in modern animal houses in Southern Bavaria
    Autorzy:
    Schierl, R
    Heise, A.
    Egger, U.
    Schneider, F.
    Eichelser, R.
    Neser, S.
    Nowak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/50088.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    pig
    animal house
    Bavaria
    endotoxin concentration
    cattle
    modern house
    poultry
    dust
    endotoxin
    Opis:
    Agricultural work, particularly livestock farming, is considered to be a notable risk factor for occupational diseases. Endotoxin as a major component of organic dust causes adverse health effects of the airways among farmers. Endotoxin concentrations in airborne and settled dust were measured in modern, naturally ventilated animal houses for different species. Median values of airborne inhalable endotoxin ranged from 16.9 EU/m3 for dairy cattle, 557.9 EU/m3 for beef cattle, 668.7 EU/m3 for pigs, 463.2 EU/m3 for laying hens, to 1,902 EU/m3 for turkeys. The endotoxin levels in settled dust followed the same pattern as the airborne samples. The concentrations were lower than in previous studies, but the proposed Dutch endotoxin threshold (50 EU/m3) was exceeded in most cases. Thus, endotoxin levels in modern animal houses still give concern for health and further reduction of endotoxin exposure in animal houses is desirable.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2007, 14, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecophenotypic plasticity versus evolutionary trends - morphological variability in Upper Jurassic bivalve shells from Portugal
    Autorzy:
    Schneider, S.
    Fursich, F.T.
    Schulz-Mirbach, F.T.
    Werner, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/23367.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ecophenotype
    plasticity versus
    evolutionary trend
    morphological variability
    Upper Jurassic
    Jurassic
    bivalve shell
    shell
    Bivalvia
    morphometry
    Fourier shape analysis
    size increase
    Late Jurassic
    Portugal
    Opis:
    Upper Jurassic marginal marine strata of the Lusitanian Basin (central Portugal) yield a rich benthic macrofauna from which three bivalve target taxa, i.e., Arcomytilus, Isognomon, and Eomiodon, were chosen for morphometric studies, because of their abundance both in space and time and their variability in shell shape. The shells have been analysed with regard to outline shape (Fourier shape analysis), dimensions, ornamentation (Arcomytilus) and ligament arrangement (Isognomon). Additionally, data on co−occurring fauna and palaeotemperatures calculated from δ18O values have been recorded. The results of the morphometric analyses have been interpreted with regard to phylogeny and palaeoecology. In all target taxa, a distinct, rapid size increase at around the Early/Late Kimmeridgian boundary is evident. Potential causes for this process are discussed, and an increase in food availability is regarded the most likely scenario. In Isognomon rugosus, a distinct change in resilifer arrangement co−occurs with size increase, resulting in the evolution of an endemic species in the Lusitanian Basin, for which the name Isognomon lusitanicus is reestablished. Like in several extant Mytilidae, morphological species characterisation in Arcomytilus turns out unsatisfactory, due to high intraspecific variability. However, Arcomytilus morrisii is still regarded as a valid species that evolved in the Lusitanian Basin. Despite high shape variability, Eomiodon securiformis is also considered to be a clearly distinguished species. For all target taxa morphologic variability is discussed with regard to environment, and variation between populations is delineated. The data suggest a weak correlation of facies and shell shape in Arcomytilus, while Isognomon lusitanicus seems to develop local varieties in different subbasins. Finally, the great morphologic plasticity of bivalves from rather distinct systematic entities is shown to result from different causes, thus demonstrating that careful studies of the involved species are a prerequisite to draw correct palaeoecological conclusions.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interactions between the entomopathogenic fungus Beauveria bassiana and the Neotropical predator Eriopis connexa (Coleoptera: Coccinellidae): Implications in biological control of pest
    Autorzy:
    Scorsetti, A.C.
    Pelizza, S.
    Fogel, M.N.
    Vianna, F.
    Schneider, M.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/65580.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    interaction
    entomopathogenic fungi
    Beauveria bassiana
    pathogen-predator interaction
    Eriopis connexa
    Coleoptera
    Coccinellidae
    biological control
    pest
    aphid
    Hemiptera
    Aphididae
    Opis:
    Aphids (Hemiptera: Aphididae) are serious pests of crops causing direct damage by feeding and indirect by the transmission of plant viruses. The use of conventional insecticides for controlling aphids has caused different problems and insecticide resistance. Accordingly, there is more interest in alternative control methods such as biological control by natural enemies for sustainable agricultural management. Among biological control agents, entomopathogenic fungi are one of the most significant microbial pathogens of insects. Also, Coccinellidae, as a major group, is a serious natural enemy. Both larval and adult stages of Coccinellidae feed on different soft-body pests, such as aphids. Eriopis connexa (Germar) (Coleoptera: Coccinellidae) is a common species in agroecosystems of the Neotropical region where it is considered to be a potential control agent. Pathogens and arthropod natural enemies may contribute to the control of phytophagous pests; however, it is important to assess potential interactions within biological control agents that share hosts (intraguild interaction) to evaluate their combined use for pest control. Therefore, the aim of this study was to evaluate the compatibility and interaction (lethal and sublethal effects) between E. connexa and the entomopathogenic fungus Beauveria bassiana (Bals.-Criv.) Vuill. (Ascomycota: Hypocreales). Both are important biological control agents of aphids. The pathogenicity of B. bassiana against larvae, pupae and adults of the predator E. connexa was evaluated, and results showed, that B. bassiana infected the coleopteran. On the other hand, interaction between B. bassiana and the predator was evaluated through infected-prey. The effects of fungus on larvae survival were significantly different when we analyzed the accumulated survival (from first larval instar to adulthood). The daily fecundity was significantly reduced at five days compared to control group. By contrast, no significant differences were observed between the five oviposition days in the rate of hatched eggs. This study shows that despite having received a single dose of the fungus in its life cycle, the population parameters of the predator E. connexa are affected. More studies would be necessary to help identify interactions between microbes and natural enemies to increase and enhance opportunities and further develop biological pest control programs.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed Power and Power Conditioning Capacitors
    Autorzy:
    Macdougall, F.
    Jow, T.
    Ennis, J.
    Yang, X.
    Yen, S.
    Cooper, R.
    Gilbert, J.
    Schneider, M.
    Naruo, C.
    Bates, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807873.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.32.Tt
    84.60.Ve
    Opis:
    A capacitor development effort focused on capacitors used in pulsed power and power conversion applications underwent at General Atomics Electronic Systems Inc. (GA-ESI) for decades. In recent years, funding for these efforts has accelerated the rate of development progress to the point where the time it takes to decrease the size of a capacitor by half has dropped from 10 years to 4 years. This progress made in pulsed power and power conversion capacitors will be described along with the performance characteristics of today's capacitors.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 989-991
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Refurbished Z Facility: Capabilities and Recent Experiments
    Autorzy:
    Matzen, M.
    Atherton, B.
    Cuneo, M.
    Donovan, G.
    Hall, C.
    Herrmann, M.
    Kiefer, M.
    Leeper, R.
    Leifeste, G.
    Long, F.
    Mckee, G.
    Mehlhorn, T.
    Porter, J.
    Schneider, L.
    Struve, K.
    Stygar, W.
    Weinbrecht, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807851.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.58.Lq
    52.59.Qy
    64.60.A-
    81.30.Bx
    Opis:
    The Z Refurbishment Project was completed in September 2007. Prior to the shutdown of the Z facility in July 2006 to install the new hardware, it provided currents of ≤ 20 MA to produce energetic, intense X-ray sources ( ≈1.6 MJ, > 200 TW) for performing high energy density science experiments and to produce high magnetic fields and pressures for performing dynamic material property experiments. The refurbishment project doubled the stored energy within the existing tank structure and replaced older components with modern, conventional technology and systems that were designed to drive both short-pulse Z-pinch implosions and long-pulse dynamic material property experiments. The project goals were to increase the delivered current for additional performance capability, improve overall precision and pulse shape flexibility for better reproducibility and data quality, and provide the capacity to perform more shots. Experiments over the past year have been devoted to bringing the facility up to full operating capabilities and implementing a refurbished suite of diagnostics. In addition, we have enhanced our X-ray backlighting diagnostics through the addition of a two-frame capability to the Z-Beamlet system and the addition of a high power laser (Z-Petawatt). In this paper, we will summarize the changes made to the Z facility, highlight the new capabilities, and discuss the results of some of the early experiments.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 956-958
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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