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    Tytuł:
    Characterization of outer membrane proteins participating in iron transport in Pasteurella multocida serotype A3
    Autorzy:
    Puchalski, A
    Dec, M.
    Wernicki, A.
    Urban-Chmiel, R.
    Gieral, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/30100.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    iron-regulated outer membrane protein
    Pasteurella multocida
    iron transport
    iron ion
    iron deficiency
    protein
    new protein
    bacterial growth
    standard condition
    molecular weight
    amino acid sequence
    Opis:
    Iron-regulated outer membrane proteins (IROMPs) of P. multocida serotype A3, which function as receptors for complexes containing iron ions, are induced by iron deficiency in the bacterial growth environment. Analysis of an electrophoresis image of proteins isolated from bacteria grown on medium supplemented with 2,2'-dipyridyl revealed expression of 16 new proteins that were not noted in the case of the bacteria grown in standard conditions, with molecular weights from 30 to 160 kDa. Induction of IROMP expression occurred within 30 minutes after restricted iron conditions were established. In immunoblotting, distinct reactions were noted for proteins of molecular weight ranges of 25-49 kDa, 61-95 kDa, and 108-214 kDa. Proteins of the molecular weight of 68, 75 and 86 kDa were analysed using mass spectrometry and matched with the highest probability to proteins in the NCBI data base. Several dozen different proteins with similar amino acid sequences were matched to each sample.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 1; 121-127
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite Material with Cast Iron Matrix Designed for Brake Systems of Technical Means of Transport
    Materiał kompozytowy z osnową z żeliwa przeznaczony na układy hamulcowe środków transportu
    Autorzy:
    Posmyk, Andrzej
    Myalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2171801.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    means of transport
    brake disc
    composite
    cast iron
    SiC foam
    środki transportu
    tarcza hamulcowa
    kompozyt
    żeliwo
    pianka SiC
    Opis:
    The paper presents the basics of manufacturing and the tribological properties of the developed cast iron-ceramic composite designed for brake discs or drums. The matrix of the composite consists of GJL-150 grey cast iron used for the production of brake discs. The reinforcing phase is a SiC foam with an activated surface. The use of ceramic foam simplifies the production process because it does not require expensive mixing of the matrix and the reinforcing phase to ensure the homogeneity of the composite. An addition of 10% SiC (λSiC= 100–350 Wm-1K-1) improves the thermal conductivity of cast iron (λCI = 50–60 Wm-1K-1). The presence of foam elements homogenously distributed throughout the whole matrix volume reduces the wear of both the composite and the counter-sample. The results of comparative studies of contacts between the cast iron and the composite brake disc showed almost a threefold lower wear of the pad and disc and about a 10°C lower temperature in the pad near the friction zone under the pressure of 1 MPa and at a sliding velocity of 0.5 m/s. The significantly lower wear of the friction elements of the brake system will contribute to a reduction in environmental pollution by wear debris, which is required by European Union directives.
    W artykule opisano podstawy wytwarzania i właściwości tribologiczne opracowanego kompozytu żeliwno-ceramicznego przeznaczonego na tarcze lub bębny hamulcowe. Osnowę kompozytu stanowi stosowane do wytwarzania tarcz hamulcowych żeliwo szare GJL-150, a umocnieniem jest pianka z SiC z aktywowaną powierzchnią. Użycie pianki ceramicznej upraszcza proces wytwarzania, ponieważ nie wymaga kosztownego mieszania osnowy i fazy zbrojącej dla zapewnienia homogeniczności kompozytu. Dodanie 10% pianki SiC (λSiC= 100–350 Wm-1K-1) poprawia przewodność cieplną żeliwa (λCI = 50–60 Wm-1K-1). Obecność równomiernie rozłożonych w całej objętości osnowy elementów pianki zmniejsza zużycie zarówno kompozytu, jak i współpracującego z nim materiału ciernego. Wyniki badań porównawczych skojarzeń z tarczą żeliwną i kompozytową wykazały mniejsze prawie trzykrotnie zużycie klocka i tarczy oraz niższą o 10°C temperaturę w klocku w pobliżu strefy tarcia przy nacisku 1 MPa i prędkości 0,5 m/s. Znacząco zmniejszone zużycie elementów ciernych układu hamulcowego przyczyni się do zmniejszenia zapylenia środowiska produktami zużycia, co jest wymagane w dyrektywach Unii Europejskiej.
    Źródło:
    Tribologia; 2022, 3; 79--86
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Białka uczestniczące w transporcie jonów żelaza(II) w bakteriach gram-ujemnych
    Proteins involved in the ferrous ions transport in gram-negative bacteria
    Autorzy:
    Kierpiec, Karolina
    Stokowa-Sołtys, Kamila
    Powiązania:
    https://bibliotekanauki.pl/articles/1413209.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    transport jonów żelaza(II)
    bakterie gram-ujemne
    Feo
    ferrous iron transport
    Hmu
    hemin uptake protein
    ferrous ions transport
    gram-negative bacteria
    Opis:
    Continuous increase in the number of multidrug-resistant strains forces us to look for drugs with completely new mode of action. One of the bacterial property determining the pathogenicity of these microorganisms is their ability to obtain iron. Because in the living environment of these single-celled individuals, its concentration is much lower than this necessary for their growth. For this reason, bacteria created various type of iron aquisition systems, including the Feo system, which mechanism of Fe2+ ion uptake is not fully understood, and protein from the Hmu family belonging to ABC transporters. The Feo transport system is one of the most common systems that is exclusively responsible for importing Fe2+ ions. It consists of three proteins: FeoA, FeoB and FeoC. FeoB is a transmembrane protein that is believed to play a key role in the mechanism of Fe2+ ion uptake. The other two components are cytoplasmic proteins. Both, FeoA and FeoC, are cytoplasmic proteins resembling the construction of transcription regulators. ABC transporters play an equally important role in maintaining iron homeostasis. These include proteins from Hmu family. HmuUV complex catalyses the import of these ions in hem iron form. The structure of this complex consists of TMD dimer (HmuU) and NBD dimer (HmuV). The HmuU is considered to be a permease - just like the FeoB described earlier while HmuV is the ATP binding protein.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 3-4; 375-394
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation modelling of Vitória-Minas closed-loop rail network
    Modelagem de simulação do circuito fechado da ferrovia Vitória Á Minas
    Autorzy:
    Faria, C. H. F. de
    Cruz, M. M. da Costa
    Powiązania:
    https://bibliotekanauki.pl/articles/375477.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway
    simulation
    closed loop
    heavy haul
    transportation of iron ore
    rolling stock
    kolej żelazna
    symulacja
    pętla zamknięta
    transport rud żelaza
    tabor kolejowy
    Opis:
    This paper presents a closed loop simulation model that represents the mining logistics chain of the Vitória Minas Railway (VMR), Brazil. The simulator includes the loading process, circulation of loaded trains, unloading of ores for external and internal markets and the distribution of empty trains for new loads. General cargo and passengers trains are also included in the model, which, along with the queues formed in the circulation and the preventive and corrective maintenance of rolling stock, tracks and equipment, interfere with the transportation of iron ore. The primary objective of the iron ore transport is to meet the daily loading and unloading schedules and minimize queues by maximizing the operations at the loading and unloading points. The VMR simulator developed uses macro-mesoscopic approach with Monte Carlo simulation. To validate the simulator, we used actual data of the railway and compared with reality. We obtained a very good adhesion to the value of 2.9% for the validation scenario (Scenario 1) and 3.4% for the scenario with reducing the number of lots of wagons (Scenario 2). We concluded with this simulation that it is possible to reduce the number of GDE wagons without reducing the current level of productivity of the rail system.
    Este artigo apresenta o modelo de simulação do circuito fechado da rede logística de minério de ferro da ferrovia Vitória Á Minas (VMR), Brasil. O simulador inclui o processo de carregamento, circulação dos trens carregados, descarregamento para os mercados externos e internos e a distribuição dos trens vazios para novos carregamentos. Os trens de carga geral e de passageiros também foram incluídos no modelo, bem como suas filas de formação e as manutenções preventivas e corretivas do material rodante, que interferem no transporte do minério de ferro. O principal objetivo do transporte de minério de ferro é atender as programações de carregamento e descarregamento e minimizar as filas maximizando as operações nos pontos de carregamento e descarregamento. O simulador VMR desenvolvido utiliza uma abordagem macro-mesoscópica de simulação de Monte Carlo. Para validar o simulador, foi utilizado dados da ferrovia e comparado com a realidade. Obtivemos uma aderência muito de 2,9% para o cenário de validação (cenário 1) e 3,4% para o cenário com a redução do número de lotes de vagão (cenário 2). Concluímos que com esta simulação é possível reduz o número de lotes de vagões GDE sem reduzir a produtividade da ferrovia.
    Źródło:
    Transport Problems; 2015, T. 10, z. spec.; 125-139
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Initial Assessment of Effectiveness of the Impulse Method of Introducing an Inoculant into Cast Iron
    Autorzy:
    Derda-Ślęzak, A.
    Soiński, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/947579.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallurgy
    inoculation
    hypoeutectic cast iron
    pneumatic transport
    metalurgia
    żeliwo podeutektyczne
    transport pneumatyczny
    Opis:
    An initial assessment of the effectiveness of cast iron inoculation, performed by the method of impulse introducing the master alloy into cast iron, is presented. The experiment was concerned with the hypoeutectic gray cast iron inoculated with either the Alinoc or the Barinoc master alloy by means of an experimental device for pneumatic transportation. Examinations involved pneumatic injection of the powdered inoculant carried in a stream of gaseous medium (argon) into the metal bath held in the crucible of an induction furnace. It was found that the examined process is characterised by both high effectiveness and stability.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 29-32
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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