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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Ultra-centrifuging on the Egg of Ascaris megalocephala (1937)
    [s.l.] : Nature Publishing Group
    Nature 139 (1937), S. 369-370 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EGGS of Ascaris megalocephala (= equorum) var. monovalens, like those of Ascaris suum1, may develop mormally after being subjected in the uncleaved condition to great centrifugal forces over long periods. However, cytological examination of eggs which have been kept in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/139369b0
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  • 2
    Electronic Resource
    Electronic Resource
    Use of the Ultra-Centrifuge for Studying the Golgi Apparatus (1934)
    [s.l.] : Nature Publishing Group
    Nature 134 (1934), S. 810-810 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN some recent work1 it has been shown that the Golgi apparatus of the uterine gland cells of the guinea pig passes centripetally when pieces of uterus are centrifuged 400,000 times gravity by the ultra-centrifuge of J. W. Beams. This effect is shown in Figs. 1 and 2 ; in Fig. 1 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/134810a0
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Ultra-Centrifuging on the Cells of the Root-Tip of the Bean (1935)
    [s.l.] : Nature Publishing Group
    Nature 135 (1935), S. 232-232 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ROOT-TIPS of the bean were centrifuged in the Beams ultra-centrifuge at approximately 400,000 times gravity for twenty minutes. The effect is shown diagrammatically in Fig. 1. Fig. 1(a) is a control cell showing the normal distribution of the cytoplasmic components and inclusions. Fig. 1(b) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/135232b0
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  • 4
    Electronic Resource
    Electronic Resource
    Fine Structure of Protozoa (1961)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 15 (1961), S. 47-68 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.15.100161.000403
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  • 5
    Electronic Resource
    Electronic Resource
    The Ciliature and Infraciliature of Nyctotherus ovalis Leidy (1961)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 8 (1961), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The structure of a cilium in Nyctotherus ovalis is that usually found: two single central filaments surrounded peripherally by nine double filaments; the whole is encased in a ciliary membrane continuous with the pellicle. The two central filaments end in a single enlarged bulb just above a septum, located at about the level of the pellicle, whereas the nine double filaments extend inward to form the cylindrical basal body, which is open at its inner end. Inside the basal body are granules àrranged in rows parallel to its sides. These granules may have significance in the origin of new basal bodies as well as in the outgrowth of new cilia. The latter may have been observed in a few instances. Parallel to the pellicle are two series of fibrils, one median and one inner, connecting adjacent basal bodies. Fibrils extend from the inner end of each basal body, these converge and extend deep into the ectoplasm, often becoming lost in a pattern of equilateral triangles, arranged to form hexagons. These features are clearly seen in the peristomial membranelles, where the basal bodies of the four rows of cilia are close together, separated from adjacent membranelles by a protoplasmic shelf and supported by a mass of fibrillar material comprising the peristomial ectoplasmic band. This broad band extends to the inner end of the peristome whence it returns along the opposite wall as a narrow mass of fibrillar ectoplasm without basal bodies. Peripherally the fibrils are condensed into fan-like bundles; internally they often form a network of equilateral triangles arranged to form hexagons, with corpuscles at the intersections. Trichite-like structures are also found in the peristomial groove and tube; these are connected to both the basal bodies and the fibrillar network.The functions, origin and development of this complex infraciliature during fission constitute one of the yet unsolved morphological problems in such complex ciliates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1961.tb01189.x
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  • 6
    Electronic Resource
    Electronic Resource
    The Ultrastructure of Tritrichomonas with Special Reference to the Blepharoplast Complex (1961)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 8 (1961), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Electron micrographs of sections through the blepharoplast complex reveal it to be composed of four kineto-somes. In many of the sections the kinetosomes contain dense particles approximately 180-200 A in diameter. The costa is a striated fiber which extends posteriorly almost the entire length of the body. Its slender proximal portion appears to be attached to the base of the kinetosome of the recurrent flagellum. The parabolas fiber is similarly constructed, but is more slender than the costa. It is attached to the base of the kinetosome of an interiorly directed flagellum and subsequently proceeds posteriorly to the level of the nucleus. The costa and parabasal fiber probably serve as anchoring or supportive structures. The size of the costa may reflect its role as a supporting structure for the most highly differentiated locomotors organelle, the undulating membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1961.tb01185.x
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  • 7
    Electronic Resource
    Electronic Resource
    The Fine Structure of the Heliozoan, Actinosphaerium nucleofilum (1960)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 7 (1960), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 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 endoplasmic reticulum of the smooth variety. The many nucleido not appear to be randomly scattered in the cytoplasm but rather to be arranged in a circular pattern. Each is bounded by a double membrane envelope. A Golgi complex, consisting of isolated bodies with an ultrastructure similar to that described by others, is usually seen associated with each nucleus.The ectoplasm contains many vacuoles of varying diameter, each of which is limited by a thin membrane; vacuoles containing dense granular material, and mitochondria.The radially arranged axiopodia are extensions of the ectoplasm. The periphery is largely composed of vacuoles, some of which contain dense granules, and mitochondria. The axial rod is birefringent and consists of many fine filaments oriented parallel to the longitudinal axis of the axiopodium. The constituent filaments penetrate deep into the endoplasm where they end in the vicinity of nuclei. The fibrillar component of the axiopodia may represent contractile units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1960.tb00729.x
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  • 8
    Electronic Resource
    Electronic Resource
    Electron Microscope Studies on Lophomonas striata with Special Reference to the Nature and Position of the Striations (1960)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 7 (1960), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The flagella of Lophomonas striata are arranged in circular rows in a tuft-like structure. Each one is continuous with a basal body located in the anterior region of the calyx. Each flagellum is limited by the surface membrane and is composed of nine double peripheral filaments and two central ones. The former continue below the surface and make up a large part of each basal body. Below and parallel to the calyx membrane are two layers of fibrils which appear to connect the basal bodies; the first is just below (250 m/x) the surface, the other is attached to the proximal ends of the basal bodies. Extending from the latter is a delicate network of fibers which gradually disappears from view as it continues in the direction of the nucleus. The calyx membrane appears continuous at the level of the basal bodies; however, below this point it seems to be made up of a series of discrete longitudinally arid obliquely arranged lamina or plates, a condition which permits direct continuity of the cytoplasm within and without the calyx. The body of Lophomonas striata is highly as well as tightly folded in its longitudinal axis and the striations or rods are clearly located on its surface; it is suggested that these are held in place by an agglutination reaction. The rods appear to divide by transverse fission and their fine structure resembles closely that reported for certain bacteria; in fact, because of this, we think they should thus be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1960.tb00713.x
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the Fine Structure of a Gregarine Parasitic in the Gut of the Grasshopper, melanoplus differentialis (1959)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 6 (1959), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Materials within the endoplasm of both the protomerite and deutomerite may be displaced and stratified by ultracentrifugation. Animals are not killed by this treatment, and in time a redistribution of stratified materials may occur. The electron microscope reveals numerous ultramicroscopic folds in the surface envelope which is composed of 3 membranes; the outer and middle cover the surface of the folds while the inner one continues as a smooth membrane over the ectoplasm. The contact surfaces of animals in syzygy do not show the small folds to be interlocked; instead, they are in fold-to-fold contact. Numerous relatively dense bodies which appear to be filamentous are sometimes observed immediately underneath or within the middle or inner membrane. Within the ectoplasm is an ultramicroscopic net-like fibrillar structure much denser than the surrounding cytoplasm. This system of fibrils is composed of anastomosing elements varying from ∼ 50 to 200 Å in diameter. Certain of the larger fibrils are directly attached to the surface envelope at positions between the folds. A second filamentous structure within the ectoplasm appears to be tubular. Elements of this system also appear to join and penetrate the surface envelope by means of pores.A large amount of gelatinous secretion forms at the surface of the sporont; as it glides forward a trail of mucous is left behind. The actual mechanism involved in the gliding movement was unobserved, but evidence is lacking to support the view that the gliding movement is engendered by posteriorly directed “jets” of mucus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1959.tb03940.x
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  • 10
    Electronic Resource
    Electronic Resource
    THE EFFECTS OF ULTRACENTRIFUGAL FORCE ON THE CELL WITH SPECIAL REFERENCE TO DIVISION (1951)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 51 (1951), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1951.tb30069.x
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