Autor: Kremer, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Acritarchs from the Upper Ordovician of Southern Holy Cross Mountains, Poland
Autorzy:: Kremer, B
Powiązania:: https://bibliotekanauki.pl/articles/21534.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: acritarch
Polska
Upper Ordovician
deposit
prasinophycean
Holy Cross Mountains
paleontology
Opis:: Acritarchs and prasinophyceans belonging to eleven genera have been found in the Upper Ordovician (Ashgill) deposits from Zalesie Nowe (Holy Cross Mountains, southern Poland). They are the first representatives of organic-walled plankton described thus far from the uppermost Ordovician/lowermost Silurian strata in the southern part of the Holy Cross Mountains.
Źródło:: Acta Palaeontologica Polonica; 2001, 46, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mat-forming coccoid cyanobacteria from Early Silurian marine deposits of Sudetes, Poland
Autorzy:: Kremer, B
Powiązania:: https://bibliotekanauki.pl/articles/22597.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: organic matter
marine environment
Cyanoprokaryota
Early Silurian
nitrogen fixation
marine deposit
Polska
Silurian
remains
coccoid cyanobacteria
Sudetes Mountains
paleontology
Opis:: Mass occurrence of mats comprised of benthic coccoid cyanobacteria is reported from early Silurian black radiolarian cherts exposed at Żdanow village (Bardzkie Mountains, Sudetes, southwestern Poland). The cherts contain laminated organic matter representing degraded benthic coccoid cyanobacterial mats. The remains of cyanobacteria occur as laminated agglomerations of variously preserved subglobular colonies composed of spherical cells of variable size and numbers. The morphology of remnants of cells and their mucilaginous envelopes, structure of colonies, and particularly the presence of small granular structures resembling reproductive cells known in extant coccoid cyanobacteria as baeocytes, permit to compare the Silurian microbiota with modern cyanobacteria assigned to the genera Stanieria or Chroococcidiopsis.
Źródło:: Acta Palaeontologica Polonica; 2006, 51, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Spore-like bodies in some Early Paleozoic acritarchs: clues to chlorococcalean affinities
Autorzy:: Kazmierczak, J
Kremer, B.
Powiązania:: https://bibliotekanauki.pl/articles/20169.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: spore-like body
Early Paleozoic
Paleozoic
acritarch
microfossil
Chlorococcales
phytoplankton
evolution
polygonomorph
acanthomorph
sphaeromorph
herkomorph acritarch
Opis:: We present discoveries of internal bodies in problematic Silurian and Devonian organic−walled microfossils classified traditionally as polygonomorph, acanthomorph, sphaeromorph, and herkomorph acritarchs. These bodies are comparable with reproductive structures (autoand/or aplanospores) of modern unicellular green algae (Chlorococcales). Our findings suggest that many of these microfossils may represent asexually reproducing (sporulating) vegetative cells of chlorococcalean algae. The presence of spore−like bodies in the studied acritarchs supports earlier suggestions, based on ultrastructural and biomarker studies, that some acritarchs can be affined with green algae.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 3; 541-551
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Mobile NMR for Analysis of Polyethylene Pipes
Autorzy:: Blümich, B.
Casanova, F.
Buda, A.
Kremer, K.
Wegener, T.
Powiązania:: https://bibliotekanauki.pl/articles/2043383.pdf
Data publikacji:: 2005-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Lg
82.35.Lr
76.60.-k
Opis:: NMR relaxometry is a suitable tool to determine the morphology of semi-crystalline polymers by its ability to discriminate between rigid, mostly crystalline and soft, usually amorphous material. The NMR-MOUSE$\text{}^{®}$ (nuclear magnetic resonance mobile universal surface explorer) was explored in this work to supply morphological data of poly(ethylene) pipes nondestructively. PE-100 pipes were investigated in the new state, after squeezing them flat, and after annealing well below the glass temperature. Furthermore, the change in morphology induced by a pressure load from the inside and a point load from the outside was investigated as a function of depth, and the morphology change across a welding line was imaged. A shear-band was detected by destructive high-field NMR imaging in an area of severe deformation of a pipe, where an anomalous depths profile was observed by the NMR-MOUSE. These results demonstrate that the NMR-MOUSE is a suitable tool for non-destructive state assessment of polymer pipes on the basis of laboratory reference data.
Źródło:: Acta Physica Polonica A; 2005, 108, 1; 13-23
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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