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    Wyświetlanie 1-7 z 7
    Tytuł:
    New records of the rare ant species (Hymenoptera, Formicidae) in Poland
    Nowe dane dotyczące rzadkich gatunków mrówek (Hymenoptera, Formicidae) w Polsce
    Autorzy:
    Radchenko, A.
    Aleksandrowicz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2053021.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    rare ant species
    Hymenoptera
    Formicidae
    Słowiński National Park
    Opis:
    There are two rare ant’s species were found on the northern part of the Wielkie Bagno peat bog in Słowiński National Park. More than 10 workers of Formica picea and four dealate gynes of Myrmica karavajevi were collected in pitfall traps 2-12 of August 2006.
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2020, 24; 73-80
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new ant genus from the late Eocene European amber
    Autorzy:
    Dlussky, G.
    Radchenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22018.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Baltic amber
    Eocene
    Eocenomyrma
    Formicidae
    Late Eocene
    Myrmicinae
    ant
    new genus
    amber
    European amber
    paleontology
    systematics
    Saxonian amber
    Danish amber
    Opis:
    Eocenomyrma gen. nov. of extinct ants of the family Formicidae, subfamily Myrmicinae, is described from the late Eocene European amber (ca. 40 Ma), based on six specimens from six pieces of amber; three of them contain E. rugosostriata (Baltic and Saxonian ambers); the remainder contain three new species: E. orthospina (Baltic Amber), E. electrina (Scandinavian Amber), and E. elegantula (Baltic Amber). Eocenomyrma resembles two extant genera: Myrmica and Temnothorax (both of which also occur in late Eocene European amber), but differs from them by the following apomorphies: clypeus short and broad, with two lateral longitudinal carinae and distinctly marked anterolateral corners, its median portion faintly concave transversally, anterior margin broad and shallowly concave medially, with pairs of long setae situated on the anterolateral clypeal corners, and central part of the anterior clypeal margin without setae; middle and hind tibiae lacking the spurs. Palp formula in Eocenomyrma is 4, 3 versus 6, 4 in Myrmica. We include Eocenomyrma in the tribe Formicoxenini. Nothomyrmica rugosostriata is transferred to Eocenomyrma, and the neotype of the latter species is designated; Nothomyrmica petiolata is transferred to the genus Temnothorax. A key for the identification of all known Eocenomyrma species is compiled.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two new primitive ant genera from the late Eocene European ambers
    Autorzy:
    Dlussky, G M
    Radchenko, A.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/20230.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new genus
    primitive ant
    ant
    Late Eocene
    Eocene
    paleontology
    European amber
    amber
    Insecta
    Hymenoptera
    Formicidae
    Myrmicinae
    evolution
    Baltic amber
    Bitterfeld amber
    Opis:
    Two extinct genera of ants from the late Eocene (ca. 40 Ma), Protomyrmica gen. nov. and Plesiomyrmex gen. nov. (family Formicidae, subfamily Myrmicinae), are described based on single specimens (males), from Baltic and Bitterfeld (also called Saxonian) ambers respectively; both genera belong to the tribe Myrmicini. In gross morphology they are similar to modern Myrmica but have a series of apomorphies combined with characters that are plesiomorphic not only in the tribe Myrmicini, but also in the subfamily Myrmicinae. The most significant plesiomorphies concern the antennal structure and wing venation of both genera. The antennal scape is short and the funiculus is filiform, having no apical club. Moreover, the antennae of Protomyrmica are “sphecoid” with the length of the funicular segments gradually decreasing towards the apex (i.e., the longest is basal, starting from the second, and the shortest is apical); this type of structure is basal for the family Formicidae as a whole. Although we consider the wing venation of Protomyrmica to represent the prototype of wings in the subfamily Myrmicinae, it has an apomorphy absent in the modern Myrmicini genera—the antennae are inserted into the head well behind the posterior margin of the clypeus. Plesiomyrmex also has a peculiar apomorphy not found in any other genus of Myrmicinae: the antennae are inserted into toruli located on short sub−vertical tube−like or cup−like structures that protrude distinctly above the head surface. As a result, we do not consider either of the newly described genera to be the direct ancestors of modern Myrmicini; nevertheless, the presence of very ancient plesiomorphies may indicate their antiquity, and thus the latest estimated time for the origin of the tribe Myrmicini should be at least the early Eocene.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 3; 435-441
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new enigmatic ant genus from late Eocene Danish Amber and its evolutionary and zoogeographic significance
    Autorzy:
    Dlussky, G.
    Radchenko, A.
    Dubovikoff, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/20167.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Usomyrma mirabilis gen. et sp. nov., belonging to the tribe Leptomyrmecini of the subfamily Dolichoderinae, are described based on two males from the late Eocene Danish Amber. Usomyrma differs from Leptomyrmex by a set of plesiomorphic and autapomorphic features. Distinctly plesiomorphic characters include the fore wing venation, i.e., the presence of the well developed pterostigma, the wide closed cell 3r and the big central closed cell that formed by the fusion of the cells (1+2r)+mcu, and the structure of mandibles, which are elongate-triangular, with a well developed masticatory margin that, unlike Leptomyrmex, possesses a set of well developed, relatively long and sharp teeth. The most distinctive autapomorphy of Usomyrma is the structure of the antennae: although it remains 13-segmented, its second funicular segment is extremely elongate, much longer than any other segment, including the apical one. The generic composition of the tribe Leptomyrmecini is partly reassessed compared to the previously published data. We propose to establish a new informal Leptomyrmex genus-group within tribe Leptomyrmecini, including in it the extant genus Leptomyrmex, two fossil (Usomyrma gen. nov., Leptomyrmula) and a “Leptomyrmex” male from the Dominican Amber that probably represents a third extinct genus. Finally, a new, alternative evolutionary and zoogeographic scenario for the Leptomyrmex genus-group is proposed. We suggest that fore wing venation of Usomyrma is ancestral to other genera of this group. The next evolutionary step was the complete reduction of the closed central cell in Leptomyrmula, while conserving the pterostigma and a wide closed cell 3r. Then, in the modern Leptomyrmex males the pterostigma was reduced and the cell 3r became very narrow. Finally, the most apomorphic condition is illustrated by the venation of “Leptomyrmex” male from the Dominican Amber, which has no pterostigma and pterostigmal appendages, combined with the absence of the closed cell 3r. As a result, we suppose that the ancestor of Leptomyrmex might penetrate from Eurasia to Australia via South-East Asia, and then Leptomyrmex penetrated to South America, where the most advanced morphologically form (i.e., “Leptomyrmex” male from the Dominican Amber) arose, but extinct in Miocene.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of flow structures during HFE-7100 refrigerant condensation
    Autorzy:
    Bohdal, T.
    Sikora, M.
    Widomska, K.
    Radchenko, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240718.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    minichannels
    flow structures
    refrigerant
    kondensacja
    minikanał
    struktura przepływu
    czynnik chłodniczy
    Opis:
    The experimental research of environmentally friendly refrigerant HFE-7100 condensation in pipe minichannels was conducted. During the investigations of HFE-7100 condensation in a minichannel with internal diameter 2 mm together with visualization of flow patterns was made. Visualization results were compared with existing flow structure maps. The identification of the range of flow patterns occurrence during the condensation process of low-pressure refrigerant HFE-7100 was made. The tests were performed throughout the whole range of condensation process.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 4; 25-34
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decrease of the herbicide fenoxaprop phytotoxicity in drought conditions: the role of the antioxidant enzymatic system
    Autorzy:
    Radchenko, M.P.
    Sychuk, A.M.
    Morderer, Y.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/66477.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    This study investigated the effects of the herbicide from the graminicide group fenoxaprop, on oat plants under a normal and reduced water supply. The study was done in vegetative experimental conditions. It was established, that plants treated with fenoxaprop after 2 days following a reduction of the water content in soil with 60% to 40% of full field moisture capacity, significantly reduced phytotoxic action. At the decreased level of water supply in the oat plants, activity of antioxidant enzymes – superoxide dismutase, and catalase increased. The fenoxaprop action did not lead to a substantial increase in superoxide anion radical and hydrogen peroxide content, which had been observed under the action of the herbicide when normal levels of water were supplied to the plants. It was concluded, that the phytotoxic action of the herbicides from the graminicide group mediated the formation of reactive oxygen species and reduction of phytotoxicity on the background effect on plants of various stressors. This reaction was due to the increased activity of antioxidant enzymes, associated with nonspecific reaction of plants to these stressors.
    Źródło:
    Journal of Plant Protection Research; 2014, 54, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetism of Narrow-Gap $Ge_{1-x-y}Sn_xMn_yTe$ and Layered $In_{1-x}Mn_xSe$ Semiconductors
    Autorzy:
    Lashkarev, G.
    Sichkovskyi, V.
    Radchenko, M.
    Dmitriev, A.
    Slyn'ko, V.
    Slyn'ko, E.
    Kovalyuk, Z.
    Butorin, P.
    Knoff, W.
    Story, T.
    Szymczak, R.
    Jakieła, R.
    Aleshkevych, P.
    Dobrowolski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811955.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.My
    75.50.Pp
    75.30.Et
    77.80.Bh
    Opis:
    Magnetic susceptibility, Hall effect and resistivity of narrow-gap $Ge_{1-x-y}Sn_xMn_yTe$ single crystals (x = 0.083÷0.115; y = 0.025÷0.124) were investigated in the temperature range 4.2-300 K revealing a ferromagnetic ordering at $T_C$ ≈ 50 K. Temperature dependence of magnetization indicates a superparamagnetic phase with magnetic clusters arranging in a spin glass state below the freezing temperature $T_f$. Magnetic structure of InSe ⟨Mn⟩ 2D-ferromagnetic single crystals was studied by SQUID magnetometry, neutron diffraction, secondary ion mass spectroscopy, and wave dispersive spectra. Hysteresis loops of magnetization were observed at least up to 350 K. The cluster model of ferromagnetism is considered. The formation of self-assembled superlattice ferromagnetic InSe:Mn/antiferromagnetic MnSe during growth process and further annealing was established.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1219-1227
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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