Autor: Bek, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A reassessment of the Pennsylvanian lycophyte cone Triplosporite Brown
Autorzy:: Thomas, B. A.
Bek, J.
Powiązania:: https://bibliotekanauki.pl/articles/138841.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Lepidostrobus
Lycospora
in situ spores
Triplosporite
Cones
Carboniferous
zarodniki
szyszka
karbon
Opis:: The type collection of the lycopsid cone species Triplosporite brownii Unger was re-examined to assess its in situ spores. The cones are monosporangiate with only microspores that possess both cingulum and zona. They equate to the dispersed miospore genus Lycospora and would be identified as Lycospora cf. pseudoannulata. Therefore, the genus Triplosporite Brown is shown to be a junior synonym to Lepidostrobus and a species emendation is given. A comparison is given with the other Lepidostrobus cones which yielded similar in situ microspores of the Lycospora pellucida Group.
Źródło:: Acta Geologica Polonica; 2014, 64, 2; 139-145
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Two new Carboniferous fertile sphenophylls and their spores from the Czech Republic
Autorzy:: Libertin, M.
Bek, J.
Drabkova, J.
Powiązania:: https://bibliotekanauki.pl/articles/20135.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: new species
Carboniferous
spore
Czech Republic
Sphenophyllales
Bowmanites
Punctatisporites
Opis:: Two new species of sphenophyllalean strobili with in situ spores are proposed from the Radnice Basin of the western and central Bohemian Carboniferous continental basins of the Czech Republic. Bowmanites brasensis sp. nov. from Břasy (Matylda Mine) and B. pseudoaquensis sp. nov. from Ovčín locality are determined mainly on the basis of their spores, which are about 100 μm in diameter. The thick−walled exine of the miospores is laevigate or sometimes very finely scabrate on the proximal contact area. Spores resemble the dispersed species Punctatisporites obesus. Cones of B. brasensis and B. pseudoaquensis are organically connected with stems having prominent blade leaves and represent a new group of sphenophyllalean strobili.
Źródło:: Acta Palaeontologica Polonica; 2008, 53, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Linear and Non-Linear Response in T-Shaped Electron Waveguides
Autorzy:: Bek, M.
Bułka, B.
Wróbel, J.
Powiązania:: https://bibliotekanauki.pl/articles/1791289.pdf
Data publikacji:: 2009-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.23.-b
73.63.Rt
85.35.Ds
85.35.Be
Opis:: We present theoretical studies of three-terminal ballistic junction in linear and non-linear regime. Various conductance and voltage dips and peaks are observed and their origin is explained as influence of the bend resistance and the threshold effect.
Źródło:: Acta Physica Polonica A; 2009, 116, 5; 829-831
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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