Last edited by Mazragore
Thursday, July 9, 2020 | History

2 edition of Actinosphaerium nucleofilum found in the catalog.

Actinosphaerium nucleofilum

Andrew Charles Macdonald

Actinosphaerium nucleofilum

the organisation of the cell with particular reference to microtubular structures.

by Andrew Charles Macdonald

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Published by University of East Anglia in Norwich .
Written in English


Edition Notes

Thesis (Ph.D.) - University of East Anglia, School of Biological Sciences, 1972.

ID Numbers
Open LibraryOL13845012M

Blog. 21 May How to take care of your mental health while working from home; 20 May How Prezi does project status updates with a distributed workplace. Disclaimer: ITIS taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. However, it is not a legal authority for statutory or regulatory purposes. While every effort has been made to provide the most reliable and up-to-date information available, ultimate legal requirements with respect to species are contained in.

  A. eichhornii, A. nucleofilum. Note: Actinosphaerium is placed under Actinosphaeriidae by AlgaeBASE, under Actinosphaeridae by Catalogue of Life & ITIS and under Actinophryidae by NCBI. (Retrieved on 15 April ) AlgaeBase link: Actinosphaerium Ritter von Stein, ; Catalogue of Life link: Actinosphaerium ; ITIS link: Actinosphaerium Ehr. Tilney LG. Studies on the microtubules in heliozoa. IV. The effect of colchicine on the formation and maintenance of the axopodia and the redevelopment of pattern in Actinosphaerium nucleofilum (Barrett). J Cell Sci. Dec; 3 (4)– Tilney LG, Hiramoto Y, Marsland D. Studies on the microtubules in heliozoa. 3.

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Actinosphaerium nucleofilum by Andrew Charles Macdonald Download PDF EPUB FB2

Actinosphaerium nucleofilum has been studied by light and electron microscopy. Thin sections of this organism reveal the relatively compact endoplasm to consist of numerous vacuoles and mitochondria.

Scattered in the cytoplasm are dense particles, presumably ribonucleoprotein particles, endoplasmic reticulum of the rough variety and a tubular Cited by: THE AXOPODIAL FILAMENTS OF THE HELIOZOON ACTINOSPHAERIUM NUCLEOFILUM 3.

PITCHING and SUSAN CRAGGS School of Biological Sciences, University of East Anglia, Norwich, England Received Aug hiACH axopod of th.e Heliozoa Actinophrys sol and Actinosphaerium is supported by an axial by: This page was last edited on 11 Decemberat Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may Actinosphaerium nucleofilum Barrett, (ref.

ID; ) reported year. (ref. ID; ) Descriptions Similar to eichhorni in general appearance; nuclei are similar to that of Actinophrys sol, um in diameter; filaments of pseudopods arise from the nuclei which are located in the peripheral zone of the endoplasm; fresh water. (ref.

ID; ). Actinosphaerium nucleofilum has been studied by light and electron microscopy. Thin sections of this organism reveal the relatively compact endoplasm to consist of numerous vacuoles and mitochondria. Actinosphaerium eichhornii Actinosphaerium eichhornii (Ehrenberg, ) Stein, Diagnosis: Body usually spherical, sometimes cylindrical or flattened; cytoplasm usually with a discrete peripheral layer of large vacuoles; ecto- and endoplasm are clearly separated; diameter of the endoplasm more than twice the thickness of the ectoplasm; numerous nuclei,scattered in the periphery of.

The motion of particles in the axopodia of Echinosphaerium nucleofilum is saltatory. In the present study, photokymograph records of motions from six axopodia have been analyzed. Particles followed rectilinear paths of from 1 to 15 mum while in continuous motion at an average velocity of plus or minus mum/s.

Electron microscope preparations were made of specimens of Actinosphaerium nucleofilum fixed in glutaraldehyde before, during, and after exposure to high pressures (4, to 8, psi).

A study of this material showed that, although other organelles were relatively stable, the microtubular elements of the axopodia and cytosome became unstable under pressure. This behavior has been documented in many species, including Actinosphaerium nucleofilum, Actinophrys sol, and Raphidiophrys contractilis.

[8] [9] [10] The rapid axopodial contraction occurs at high speed, often in excess of 5mm/s or tens of body lengths per second. Actinosphaerium eichhornie (Ehrenberg, ) is the largest of the Heliozoans, reaching the diameter of a pinhead (µm). There is a variation that can even reach 1 mm.

Actinosphaerium is the only Heliozoan with multiple nuclei (the actual number depends on the size of the individual species) and is a planktic species living between. Actinosphaerium nucleofilum (Barrett 54) 9 TUCKER, j.

Fine structur and functioe n of th cytopharyngeae l baske itn the ciliate Nassula TYLER, A. See PIATIGORSK anYd TYLER VAN HARREVELD A., and KHATTAB I, F. Perfusio. n fixation with glutaraldehyde and post-fixation with osmium tetroxid foer electron microscopy Spectacular advances are being made in our understanding of cells, from the beautiful intricacy of their structure to the incredible complexity of the biochemical reactions and pathways that regulate their behavior.

Published to mark the 40th anniversary of The American Society for Cell Biology, Landmark Papers in Cell Biology contains reprints of 42 seminal papers that illustrate the fields. On the assumption that the double-coiled pattern of microtubules in the axoneme of Echinosphaerium might be due to links of two sizes between adjacent microtubules, we disassembled microtubules with low temperature and then carefully analyzed the patterns of microtubules that formed upon the addition of heat (22°C) or heat and D 2 O.

Although most of the initial clusters of microtubules that. III. A pressure analysis of the role of these structures in the formation and maintenance of the axopodia of Actinosphaerium nucleofilum (Barrett).

Cell Biol. 29, 77–95 (). PubMed Google Scholar. Tilney, L. G., & Byers, B. Studies on the microtubules in heliozoa. Factors controlling the organization of microtubules in the axonemal pattern in Echinosphaerium (Actinosphaerium) nucleofilum.

Journal of Cell Biology, 43, – CrossRef PubMed PubMedCentral Google Scholar. The Effect of Colchicine on the Formation and Maintenance of the Axopodia and the Redevelopment of Pattern in Actinosphaerium Nucleofilum (Barrett) Journal of Cell Science, Dec L. TILNEY. Tweet. A PDF file should load here.

If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a. Actinosphaerium akamae (Shigenaka, Watanabe et Suzaki, ). Diagnosis: nuclei with nucleolar material as a central cluster of granules, and with a cyst wall not incorporating siliceous components.

Ecology: fresh water. Remarks: Much of the information provided about this species relates to the dimensions of the cell, and proportions of endoplasm and ectoplasm (morphometric characters). Fine structure of the membrane system was examined in a large heliozoon, Echinosphaerium akamae, especially by means of negative staining and thin sectioning under the electron addition to solitary membranous organelles such as mitochondrion, Golgi apparatus and nuclear envelope, there was found a continuous membrane system within the axopodium and the peripheral region of the.

With stiff 'arms' radiating in all directions, these microscopic organisms look like sea urchinsLive specimens are used for a wide variety of studies including studying the physiological effects of drugs on a specimen’s heartbeat and temperature on metabolism, the locomotion of microscopic organisms, and studying plant respiration, photosynthesis, plosmolysis, and more.

Actinosphaerium nucleofilum Nikolaev et al. () [ edit ] From The twilight of Heliozoa and rise of Rhizaria, an emerging supergroup of amoeboid eukaryotes, [4]. structure of Actinosphaerium and suggeste thd thae microtubulet s which mak upe () book for the detailed history) first noted its effect on cells in metaphase inand since then numerous investigators have reported on its effect on the spindle fibres (Inou6, ).

Living specimens of A. nucleofilum (Barrett) were obtained from.The axon hillock and initial segment Article (PDF Available) in The Journal of Cell Biology 38(1) July with Reads How we measure 'reads'.

Actinosphaerium 1 Sarah Jensen. Loading Unsubscribe from Sarah Jensen? ACTINOSPHAERIUM HELIOZOO HELIOZOA - Duration: .