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Wyszukujesz frazę "Petrova, M." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Electroless Deposition of Composite Nickel-Phosphorous Coatings with Diamond Dispersoid
    Autorzy:
    Petrova, M.
    Georgieva, M.
    Chakarova, V.
    Dobreva, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/353820.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    functional composites
    electroless coatings
    metal-matrix composites
    non-metallic substrate
    Opis:
    The composite Ni-P coating with diamond particles (D) deposited on the flexible substrates of pressed polyethylene terephthalate material (PET) was obtained, to be used in the development of efficient, flexible grinding and polishing tools. The optimal conditions of the hydrodynamic regime, deposition time and temperature were found. The influence of the concentration and size of the D particles (3/7 ÷ 225/300 μm) on the coating thickness and number of co-deposited particles were studied. By Scanning Electron Microscopy (SEM) images were defined the morphology of dispersion coatings and number of co-deposited particles in them, and Energy Dispersive Spectroscopy (EDS/INCA) was used to determine the elemental chemical composition of the composite coatings.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 493-498
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Micropropagation studies and antioxidant analysis of the endangered plants of Bulgarian yellow gentian (Gentiana lutea L.)
    Autorzy:
    Petrova, M.I.
    Zayova, E.G.
    Dimitrova, L.I.
    Geneva, M.P.
    Miladinova-Georgieva, K.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/12687267.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    yellow gentian
    Gentiana lutea
    herbal plant
    medicinal plant
    endangered plant
    micropropagation
    seed germination
    plant growth regulator
    antioxidant
    antioxidant analysis
    Opis:
    In order to develop an efficient micropropagation system, it is essential to establish the appropriate concentration of growth regulators for seed germination, shoot formation and rooting. Nodal segments from in vitro obtained seedlings of Gentiana lutea L. were cultured in vitro in Murashige and Skoog’s medium supplemented with BAP, Thidiazuron and Zeatin (0.5, 1.0 and 2.0 mg L−1). A maximum number of shoots with the highest height was recorded at 2.0 mg L−1 BAP. For further optimization of the process, we used nutrient media containing BAP and Zeatin with a combination of low concentration of Indoleacetic acid. MS medium containing 2.0 mg L−1 Zeatin and 0.2 mg L−1 IAA resulted in maximum numbers of shoots 94.3) with shoot height 2.5 cm. The multiple plants were successfully ex vitro acclimatized with 65% survival. The presence of growth regulators (2.0 mg L−1 Zeatin and 0.2 mg L−1 IAA) in the nutrient media resulted in an effective antioxidant activity in G. Lutea determined by the low molecular antioxidant metabolites such as phenols and flavonoids and activities of antioxidant enzymes – catalase, ascorbate peroxidase, guaiacol peroxidase, and superoxide dismutase. The described protocol allows the establishment of numerous micropropaged plants of rare and endangered G. lutea.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 3; 71-78
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Macromycetes in the Pirin Mts (SW Bulgaria)
    Autorzy:
    Denchev, C.M.
    Fakirova, V.I.
    Gyosheva, M.M.
    Petrova, R.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/67341.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    macromycete
    Pirin Mountains
    Bulgaria
    fungal diversity
    Pirin National Park
    Opis:
    This paper attempts to compile available and unpublished data on the macromycetes of the Pirin Mts. The total number of currently known species is 350, including 34 ascomycetes and 316 basidiomycetes. Among them, 60 species are reported for the first time for the Pirin Mts, including Inocybe pisciodora which is a new record for Bulgaria.The species composition, ecological-trophic structure, and economically important edible fungi are briefly discussed. A list of 25 macroscopic fungi of conservation significance for the mycota of this mountain, evaluated with the recent IUCN criteria, is given, including 4 Critically Endangered, 9 Endangered, 7 Vulnerable, and 5 Near Threatened species.
    Źródło:
    Acta Mycologica; 2007, 42, 1
    0001-625X
    2353-074X
    Pojawia się w:
    Acta Mycologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antifungal activity of essential oils against selected terverticillate penicillia
    Autorzy:
    Felsociova, S.
    Kacaniova, M.
    Horska, E.
    Vukovic, N.
    Hleba, L.
    Petrova, J.
    Rovna, K.
    Stricik, M.
    Hajduova, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/51849.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technology of Artificial Deposit Preservation at the Kursk Magnetic Anomaly
    Autorzy:
    Pashkevich, M. A.
    Petrova, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/123703.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    waste repository
    adverse impact
    technogenic deposit
    reclamation
    conservation
    Opis:
    An evaluation of existing insulation and remediation technologies for solid mineral waste storages is carried out. Results of field observations at one of the largest tailings in Russia are given. A quality of atmospheric air, and surface and ground water are estimated in the impact areas of a magnetic separation waste storage at an iron ore deposit of the Kursk Magnetic Anomaly. An effective method of landfill’s surface insulation using polymeric materials is offered. The technological insulation process by means of a self-propelled screening machine is described. The suggested method will allow preserving an artificial deposit until the time of its rational mining, stopping water and wind erosion from its surface. Environmental conditions in its location area will be improved and pollution of atmosphere, soil, and natural water will be reduced.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 4; 11-16
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of way of life and environment on the prevalence of Chlamydia felis in cats as potentional sources of infection for humans
    Autorzy:
    Halanova, M.
    Petrova, L.
    Halan, M.
    Trbolova, A.
    Babinska, I.
    Weissova, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083221.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Chlamydia felis
    cat
    prevalence
    zoonosis
    PCR
    public health
    Opis:
    Introduction and objectives. Chlamydia (C.) felis can cause infection which may be associated with conjunctivitis and/or respiratory tract disease, particularly in kittens, but could also be the cause of the disease in adult cats. Infection is more common in multi-cat environments. The zoonotic potential of C. felis appears low, but exposure to this microorganism is possible by handling the affected cats, by contact with their aerosol, and also via fomites. Materials and method. In the study, 140 cats of various breeds from Košice region in Slovakia were studied. Conjunctival samples were obtained from 71 clinically healthy cats (50.7%) and 69 cats with clinical signs of conjunctivitis and upper respiratory tract impairment (49.3%). Cats were divided into 4 groups according to breed and type of environment in which they lived. In the 1st group were cats kept inside only (n=33), in the 2nd group, free-roaming cats (n=50), the 3rd group comprised stray cats, taken from the streets (n=28), and the 4th group included cats kept in shelters or deposit devices (n=29). Molecular method PCR and DNA sequencing was used as the diagnostic method. Results. Overall positivity was 17.1%. Of the 24 positive cats, the highest positivity was detected in the population of stray cats (35.7%) and shelter cats (31%). In the group of free-roaming cats, 10% had positivity. No positive animals were detected in the group of cats kept inside only. It was also found that the risk of C. felis in cats with clinical signs of disease was more than 7-fold higher than in cats without clinical signs of conjunctivitis and respiratory tract. Conclusion. The obtained results show that cats, especially stray and shelter cats, can be important sources of feline chlamydiosis, and due to their close contact with people they can present a risk for transmission.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 222-226
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic
    Autorzy:
    Hladilová, Š.
    Nehyba, S.
    Zágoršek, K.
    Tomanová-Petrová, P.
    Bitner, M. A.
    Demeny, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/191298.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Carpathian Foredeep
    borehole cores
    early Badenian
    marine transgression
    sedimentology
    palaeontology
    geochemistry
    Opis:
    This multidisciplinary study, based on borehole cores from the Hluchov area in Czech Republic, documents an early Badenian marine transgression on the outer flank of the Western Carpathian Foredeep. The shallow-marine deposits represent coastal transgression over a terrestrial topography of weathered pre-Cenozoic bedrock. The lower facies association (FA1) consists of siliciclastic sediment derived from local substrate erosion. Facies indicate a wave-dominated environment with unstable bottom, variable rate of sediment supply and an incremental rise of relative sea level. The upper facies association (FA2) consists of carbonates indicating a major landward shift of shoreline, decline in siliciclastic input and further sea-level rise. The succession represents a transgressive to highstand systems tract. The maximum flooding surface, ca. 1 m above the FA1/FA2 boundary, is signified by an anomalous decrease in K and Th, an increased Th/K ratio and highest U concentration. The heavy-mineral assemblages in FA1 confirm local sediment provenance, whereas those in FA2 indicate broader sediment derivation, including volcanic component from contemporaneous rhyolitic to rhyodacitic eruptions. The deposits contain a wide range of marine fauna, with the foraminifers and molluscs indicating an early Badenian age. Molluscs, bryozoans and echinoderms indicate a normal-salinity environment with a decreasing hydraulic energy. Foraminifers indicate salinity fluctuations in the lowest part of the succession. The isotopic composition of mollusc shells shows marked inter-species differences and a general negative shift in the δ13C and δ18O values, indicating diagenetic alteration. The impact of diagenetic processes appears to have been controlled by sedimentary facies. The highly negative δ13C and δ18O values correspond to sediment layers with the highest Th/K ratios and hence low clay content. Sediment permeability was thus probably crucial in controlling the differential circulation and impact of diagenetic fluids.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2014, 84, 3; 259-279
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technogenic Impact of Sulphide-Containing Wastes Produced by Ore Mining and Processing at the Ozernoe Deposit: Investigation and Forecast
    Autorzy:
    Pashkevich, M. A.
    Petrova, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/124645.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    dumps of sulphide-containing wastes
    adverse impact
    environmental hazard
    acid mine drainage
    express-method of acid indication
    Opis:
    The paper provides an assessment of the potential technogenic impact of sulphide-containing wastes produced by ore extraction and processing at the Ozernoe deposit, which is currently at the initial stage of mining. The analysed averaged samples of ore and wastes of mining and processing were obtained in the course of semi-industrial experimental preproduction. The results of monitoring studies in the area of sulphide-containing dumps formed at an exploring mine in the 1960s were used for assessing a potential hazard of the wastes. The origin of acid mine drainage is described. Advantages and shortcomings of tests assessing acid mine drainage are considered. The used express-method of acid indication allows to reliably determine the risk of acid mine drainage by the values of acidic and neutralising potentials formed by rocks. An estimation of acid mine drainage formation and heavy metal migration is carried out at dumps of the exploring mine. The forecast of environmental impact is given for the future wastes of mining and processing at the Ozernoe deposit.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 6; 127-133
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local catastrophe caused by tephra input near Přemyslovice (Moravia, Czech Republic) during the Middle Miocene
    Autorzy:
    Zágoršek, K.
    Nehyba, S.
    Petrová, P. T.
    Hladilová, S.
    Bittner, M. A.
    Doláková, N.
    Hrabovský, J.
    Jašková, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058991.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Middle Miocene
    Carpathian Foredeep
    Moravia
    tephra fallout
    succession of biota
    Czech Republic
    Opis:
    Colonization by marine organisms such as foraminifers, molluscs, bryozoans, brachiopods and red algae during the Middle Miocene (Early Badenian) transgression near Přemyslovice (Carpathian Foredeep) was initially affected by a cool water current of unclear origin. However, shortly afterwards, fallout of volcanic material caused a total termination of the biota. After this catastrophe, the biota started recolonize the area. The succeeding association, adopted to warm-water input, is characteristic of the climatic optimum during the Early Badenian and is comparable with those of other sections referred to this interval in the Carpathian Foredeep (such as Kralice nad Oslavou, Podbřežice, and Hluchov).
    Źródło:
    Geological Quarterly; 2012, 56, 2; 269-284
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessments of the sylvinite ore dressability at the Starobin potassium salt deposit
    Ocena możliwości wzbogacenia rudy sylwinitowej ze starobińskiego złoża soli potasowej
    Autorzy:
    Petrova, N. S.
    Bakhmutskaya, L. V.
    Zhuravskaya, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184771.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    złoża soli potasowej
    wzbogacanie rudy sylwinowej
    kopalnia Nezhin
    Białoruś
    potash deposits
    sylvine ore dreassability
    Nezhin mine
    Belarus
    Opis:
    Determination of basic quality parameters of sylvinite ores qualifies them as economic mineral material only, but does not account for the properties necessary to be considered to classify their dressability. A saturation exploration of the Nezhin mining site involved for the first time a forecast and technological assessment of sylvinite ores in three minable potash horizons, which was made along with estimates of geological fields and was based on a comprehensive study of the mineralogical and technological features of ores in the rock massif and crushed samples.
    Określenie podstawowych parametrów jakościowych złóż sylwinitu umożliwia ustalenie ich użyteczności ekonomicznej, lecz nie pozwala ocenić własności niezbędnych do oceny możliwości wzbogacenia rudy. Badania geologiczne prowadzone w kopalni Nezhin umożliwiły po raz pierwszy prognozowanie i techniczne oszacowanie mineralizacji sylwinitowej w trzech eksploatowanych horyzontach potasonośnych dzięki zastosowaniu kompleksowej analizy cech mineralogicznych i technologicznych mineralizacji w litych i pokruszonych próbkach ze złoża. Przemysłowe złoża potasowe kopalni Nezhin zawierają kopalinę o wysokiej zawartości sylwinu, ich główne ciało rudne zakwalifikowano jako obiekt o średniej możliwości wzbogacenia. Jako sylwinitowe serie eksploatacyjne wyodrębnia się warstwy kopaliny reprezentujące jeden typ technologiczny kopaliny. Mineralizacja potasowa wykazuje nieznaczne różnice w eksploatowanych warstwach II poziomu, jest obfita w warstwach sylwinitowych nr 2, 3 i 4 III poziomu oraz w warstwach I poziomu potasonośnego. Udział we frakcji rudy powyżej 0.5 mm sięga ponad 70%. Właściwości technologiczne sylwinitowej rudy z głównych poziomów eksploatacyjnych kopalni Nezhin wskazują, że instalacja wzbogacająca rudę do wymaganego poziomu przemysłowego może być użyteczna dla rudy pokruszonej do frakcji 3.15 mm.
    Źródło:
    Geology, Geophysics and Environment; 2012, 38, 1; 93-97
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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