The Biology of the ProtozoaBaillière, Tindall & Cox, 1926 - 623 pagine |
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Parole e frasi comuni
activities adoral zone Amaba appear asexual axial filaments basal bodies blepharoplast budding Bütschli Calkins capsule cell centriole characteristic chromatin chromatophores chromosomes cilia cirri colonies complex conjugation contractile vacuole cultures cycle cyst cytoplasm degeneration described Didinium differentiated digestive divides division-rate Doflein ectoplasm ellipsoidal encystment endobasal body endoplasm endosome epimerite evidence ex-conjugants Family fertilization flagella flagellates flagellum Foraminifera formation forms function fusion gametes gamonts gelatinous genera Genus give rise granules gregarines Heliozoa individuals Infusoria kinetic elements Kofoid Léger macronucleus Maupas membranelles metabolic Metazoa microgametes motile organs mouth multiple division myonemes nuclear nuclei nutrition occurs parabasal body Paramecium caudatum parasites peristome plates posterior end present processes protoplasm Protozoa pseudopodia Radiolaria reorganization reproduction rhizoplasts rhizopods Schaudinn shell similar single species spindle spines spores sporoblasts sporozoites stages stalk structure Sub-family SUB-ORDER substances Suctoria tentacles tion types undulating membranes Uroleptus mobilis usually ventral vitality Woodruff zygote
Brani popolari
Pagina 182 - Actinobolus radians, which combines the selection of food with the offensive use of trichocysts. This remarkable organism possesses a coating of cilia and protractile tentacles, which may be elongated to a length equal to three times the body-diameter, or withdrawn completely into the body. The ends of the tentacles are loaded with trichocysts (Entz, '83).
Pagina 183 - ... entangled without injury to themselves and without disturbing the actinobolus or drawing out the fatal darts. When, however, an Halteria grandinella, with its quick and jerky movements, approaches the spot, the carnivore is not so peaceful. The trichocysts are discharged with unerring aim, and the halteria whirls around in a vigorous, but vain, effort to escape, then becomes quiet, with cilia outstretched, perfectly paralyzed.
Pagina 598 - AND ERDMANN, R. 1914. A normal periodic reorganization process without cell fusion in Paramecium.
Pagina 182 - ... which smaller ciliates, such as urocentrum, gastrostyla, etc., or flagellates of all kinds may become entangled without injury to themselves and without disturbing the actinobolus or drawing out the fatal darts. When, however, an Halteria grandinella, with its quick and jerky movements, approaches the spot, the carnivore is not so peaceful. The trichocysts are discharged with unerring aim, and the halteria whirls...
Pagina 125 - Sharp, RG 1914. Diplodinium ecaudatum with an Account of its Neuromotor Apparatus.
Pagina 511 - He believes that conjugation occurs " not as a result of starvation, but at the beginning of a decline in the nutritive conditions, after a period of exceptional richness that has induced rapid multiplication
Pagina iii - ... we may compare and evaluate the vast annual output of observations and experiments. For such a common viewpoint it is necessary, however, to go beyond the conception of the cell to the underlying and more fundamental principles of biology. In the present work I have brought together the conclusions founded on thirty years of research on the Protozoa and on an equal number of years of teaching protozoology at Columbia University and recently at the Marine Biological Laboratory at Woods Hole.
Pagina 508 - Woodruff, LL 1905. An experimental study of the life history of hypotrichous infusoria.
Pagina 376 - Here also the old macronucleus fragments and the fragments are absorbed in the cytoplasm, while a new macronucleus and micronuclei are formed from the division products of the old micronuclei.
Pagina 239 - Inside the periplast envelope are a number of daughter trypanosomes " wriggling very actively ; the envelope becomes more and more tense, and finally bursts with explosive suddenness, setting free the flagellates, usually about eight in number, within the host-cell