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Wyświetlanie 1-10 z 19
Tytuł:
Endosymbionts of Protozoa
Endosymbionty pierwotniaków
Autorzy:
Smela, Monika
Opis:
Większość pierwotniaków żyje w ścisłej kooperacji z endosymbiontami. Są one odpowiedzialne za syntezę niektórych składników odżywczych oraz mają wpływ na odporność swoich gospodarzy na działanie substancji toksycznych. Celem poniższej pracy było opisanie organizmów endosymbiotycznych, występujących u wybranych gatunków pierwotniaków: orzęsków, wiciowców i ameb. Pierwotniaki mogą być gospodarzami dla symbiontów bakteryjnych (zazwyczaj bakterii Gram ujemnych należących do klasy Bacteroidetes lub Proteobacteria) lub jednokomórkowych zielenic. Organizmy te, zlokalizowane są w cytoplazmie komórki zazwyczaj w pobliżu mitochondriów oraz jądra komórkowego i mogą występować pojedynczo lub mogą być skupione w grupach. Symbioza pomiędzy pierwotniakami i ich endosymbiontami jest dla nich korzystna, jednak niekonieczna do przeżycia.
Most of Protozoa usually live in close cooperation with endosymbionts, which are responsible for the synthesis of certain nutrients or they have an impact on the resistance of their hosts on toxic substances. The aim of this study was to describe endosymbiotic microorganisms occurring in selected species of Protozoa: ciliates, flagellates and amoebae. Protozoa may be host to bacterial endosymbionts (usually Gram - negative bacteria, belonging to the classes Bacteroidetes and Proteobacteria) or to single - celled green algae. These organisms are located in the cytoplasm, usually near mitochondria and a cell nucleus and they can occur singly or they can also be grouped together. The symbiosis between Protozoa and their endosymbionts is usually beneficial, but not necessary for their survival.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Nebela kivuense Gauthier-Lièvre et Thomas, 1961 (Amoebozoa, Arcellinida), Missing for a Half-century; Found 11,500 km from “home”
Autorzy:
Nicholls, Kenneth H.
Tematy:
Nebela, testate amoeba, Hyalospheniidae, protist biogeography
Pokaż więcej
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763752.pdf  Link otwiera się w nowym oknie
Opis:
In 1961, the testate amoeba Nebela kivuense Gauthier-Lièvre et Thomas, 1961 was described for the first and only time from an area near Lake Edward in the Democratic Republic of the Congo (at 0.002° N Latitude). The lack of recent reports of this species, despite exhaustive surveys of the testate amoebae fauna of the major continents of the world, suggested that N. kivuense was a rare species perhaps endemic to a small, local equatorial region of the African continent. This paper reports its rediscovery from two wetland-conifer forest ecosystems in southern Ontario, Canada (at 44° N Latitude), thus changing dramatically our previous perception of its very restricted global distribution. This has implications for the idea held by many students of biogeography that there is a special category of microscopic protists that contains truly rare species and their rarity, perhaps together with specific habitat requirements and tolerances, limits opportunities for dispersal around the world. The N. kivuense story is a clear example of the dangers of inferring endemism from rarity.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Testate Amoeba, Matsakision ogawaraensis sp. nov. (Silicofilosea: Incertae sedis Euglyphida) from Lake Shore Sand of Northern Japan
Autorzy:
Aoki, Yoshiyuki
Sogame, Yoichiro
Wanner, Manfred
Mazei, Yuri
Shimano, Satoshi D.
Tematy:
lake
Japan
testate amoeba
Matsakision
Rhizaria
Pokaż więcej
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/52070074.pdf  Link otwiera się w nowym oknie
Opis:
A new species of a testate amoeba, Matsakision ogawaraensis sp. nov., is described from Ogawara pond, Aomori Prefecture, Japan. This is the third species in the genus Matsakision. Matsakision ogawaraensis sp. nov. is distinguished from two other species by the specific form of the shell in apertural view, which is triangular (the shells of other species are circular or elliptic). In addition, it has a chitinous lip around the aperture. For the first time, long needle-like pseudopodia have been observed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Amoeba Management System transformation in the light of organisational change literature
Autorzy:
Urban, W.
Tematy:
Amoeba Management System
organisational change
Kyocera
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/407369.pdf  Link otwiera się w nowym oknie
Opis:
The object of this study is the system of amoebas founded originally in Japanese Kyocera. The study aims to identify milestones of the transformation in a company organisational system to the Amoeba Management System (AMS). The study takes a conceptual research approach. It starts from the analysis of available sources on the AMS, identifies the most challenging points of this system, and afterwards, based on organisational change literature, formulates the main steps of transformation towards AMS. The following milestones of AMS implementation emerge from organisational change theories: (1) the preparation for AMS, (2) the change of organisational structure, (3) the design and introduction of a new accounting system, (4) the introduction of inner prices between amoebas, and (5) the transformation of the organisational culture. At the end of the study, the most important issues for future research are listed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation of the Amoeba Thecamoeba quadrilineata Harbouring Intranuclear Spore Forming Endoparasites Considered as Fungus-like Organisms
Autorzy:
Michel, Rolf
HAURÖDER, Bärbel
ZÖLLER, Lothar
Tematy:
Fungal endoparasite, Nucleophaga, Thecamoeba, Sappinia, ultrastructure, amoeba
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Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763724.pdf  Link otwiera się w nowym oknie
Opis:
Among a population of Thecamoeba quadrilineata (Thecamoebidae) isolated from moss samples some trophozoites harboured intracellular aggregates of round-oval parasites which turned out to be spores with a real nucleus. These organisms were supposed to be fungal endoparasites beginning their development within the nucleus of the host invaded by young parasitic stages after the host amoeba had engulfed free spores from the environment. The complete developmental cycle was studied by electron microscopy, showing the intranuclear growth of freshly invaded young stages into large spore forming parasites differentiating into a great number of spores – all within the border of the host’s nuclear membrane. These spores were not released into the environment until the death and decay of the host amoeba, where they could be ingested as infective stages by hitherto not infected thecamoebae. Host range studies with various free-living amoebae (FLA) showed that T. striata and T. terricola were as permissive to infection as the original host T. quadrilineata. Sappinia was only susceptible to a certain extent and therefore not considered as possible natural host. Remarkably, this observation shows that both nuclei of the bi-nucleate amoeba became simultaneously infected. The present morphological description corresponds to early observations with fungal intranuclear parasites called Nucleophaga Dangeard, 1887. However, genetic and phylogenetic studies have to corroborate the supposed fungal nature.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth Rate Modulation Enables Coexistence in a Competitive Exclusion Scenario Between Microbial Eukaryotes
Autorzy:
Ribeiro, Giulia Magri
Prado, Paulo Inácio
Coutinho, Renato Mendes
Rillo, Marina Costa
Pereira Junior, Samuel
Porfírio-Sousa, Alfredo L.
Lahr, Daniel J. G.
Tematy:
competition
protists
testate-amoeba
experimental ecology
coexistence
microcosm
Pokaż więcej
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/52229629.pdf  Link otwiera się w nowym oknie
Opis:
Coexistence usually are exceeding the explicable rate by competitive exclusion principle. Since the pioneer Gause, many studies have used protist microcosm systems to study competitive exclusion. We explored a two-species system with the testate-amoebae: (Arcella intermedia and Pyxidicula operculata), where competitive exclusion is expected to occur. We determined their growth curves individually and under competitive interaction. We used a state-space model to represent system dynamics and calculated posterior population sizes simulating competition dynamics. Contrarily to our expectation, Arcella and Pyxidicula showed similar growth rates (1.37 and 1.46 days–1 respectively) and only different carrying capacity (1,997 and 25,108 cells cm–2 respectively). The maximum number of cells of both species when growing in competition was much lower if compared to the monospecific cultures (in average, 73% and 80% less for Arcella and Pyxidicula respectively). However, our competition experiments always resulted in coexistence. According to the models, the drop in growth rates and stochasticity mainly explains our coexistence results. We propose that a context of ephemeral resources can explain these results. Additionally, we propose generating factors of stochasticity as intraspecific variation, small population effects, toxicity of waste products and influence of the bacterial community.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 19

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