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  • Springer  (61,770)
  • Springer Nature  (6,298)
  • American Meteorological Society
  • 1995-1999  (69,415)
  • 1990-1994
  • 1960-1964
  • 1997  (69,415)
Collection
Keywords
Publisher
Years
  • 1995-1999  (69,415)
  • 1990-1994
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    A parallel scaled conjugate-gradient algorithm for the solution phase of gathering radiosity on hypercubes (1997)
    Springer
    The visual computer 13 (1997), S. 1-19 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Gathering radiosity ; Scaled conjugate-gradient method ; Parallel algorithms ; Hypercube multicomputer ; Data redistribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003710050085
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  • 2
    Electronic Resource
    Electronic Resource
    A new antialiasing approach for image compositing (1997)
    Springer
    The visual computer 13 (1997), S. 218-227 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Image compositing ; Antialiasing ; Discrete regions ; Discrete contours ; Euclidean paths
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003710050100
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  • 3
    Electronic Resource
    Electronic Resource
    Scattered data fitting with simplex splines in two and three dimensional spaces (1997)
    Springer
    The visual computer 13 (1997), S. 295-315 
    Details
    ISSN: 1432-2315
    Keywords: Key words: α-Hull ; Fitting ; Simplex spline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003710050105
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  • 4
    Electronic Resource
    Electronic Resource
    A note on computing the saddle values in isosurface polygonization (1997)
    Springer
    The visual computer 13 (1997), S. 342-344 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Volume visualization ; Marching cubes ; Topology consistency ; Saddle value
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003710050108
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and development of the nephridia of Tomopteris helgolandica (Annelida) (1997)
    Springer
    Zoomorphology 117 (1997), S. 1-11 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Nephridial diversity is high in Phyllodocida (Annelida) and ranges from protonephridia to metanephridia. The nephridia of Tomopteris helgolandica (Tomopteridae) can be characterized as metanephridia which bear a multiciliated solenocyte. This cell is medially apposed to the proximal part of the nephridial duct and bears several cilia, each of which is surrounded by a ring of 13 microvilli. An extracellular matrix connects the microvilli and thus leads to the impression of a tube surrounding the central cilium. Each tube separately enters a subjacent duct cell and the cilia extend into a cup-shaped compartment within the duct cell. This compartment is not connected to the duct. The funnel consists of eight multiciliated cells and is connected to the nephridial duct, which initially runs intercellularly and later percellularly. The last duct cell bears a neck-like process which pierces the subepidermal basal membrane and is connected to epidermal cells forming a small invagination, the nephropore. The nephridia of T. helgolandica develop from a band of cells and all structural components are differentiated at an early developmental stage. Further development is characterized by enlargment of the funnel, ciliogenesis in the solenocyte, merging of different sections of the duct and, finally, the formation of the nephropore. An evaluation of the nephridia of T. helgolandica leads to the hypothesis that the nephridial diversity in Phyllodocida can be explained by the retainment of different stages in the transition of protonephridia into metanephridia; this is caused by the formation of a ciliated funnel at different ontogenetic stages. Although the protonephridia in Phyllodocida are regarded as primary nephridial organs, protonephridia are also presumed to have evolved secondarily in progenetic interstitial species of the Annelida by an incomplete differentiation of the nephridial anlage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004350050024
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrastructure of the male reproductive organs in the interstitial annelid Sphaerosyllis hermaphrodita (”Polychaeta”, Syllidae) (1997)
    Springer
    Zoomorphology 117 (1997), S. 13-22 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The reproductive organs of the simultaneous hermaphrodite Sphaerosyllis hermaphrodita (Syllidae, Exogoninae) were examined by TEM and reconstructed from ultrathin serial sections. Oocytes are produced in the 11–13th chaetigerous segments and then attached to the outer body surface. The male organs comprise a seminal vesicle, testes, sperm ducts and copulatory chaetae. The unpaired seminal vesicle is an uncompartmented cavity above the gut and within the chaetigerous segments 8–10. Its interior is lined with a layer of gland cells that degenerate as spermatogenesis in the vesicle proceeds. The testes are situated ventrolaterally, close to the seminal vesicle in the 9th chaetigerous segment. They contain cells at early stages of spermatogenesis, which are connected to one another by zonulae collares. The testes and seminal vesicle are enclosed in epithelia. Paired sperm ducts run ventrally from about the midline of the body under the seminal vesicle and into the parapodia of the 9th chaetigerous segment. There they open, together with the protonephridia of this segment, to the outside next to the stout copulatory chaeta. Each sperm duct consists of six cells, the luminal surface of which bears microvilli but no cilia. Only in animals with fully differentiated sperm does the small opening of the proximal duct cell in each duct give access to the seminal vesicle. The mode of sperm transfer is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004350050025
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrastructure of the nuchal organ and cerebral organ in Onchnesoma squamatum (Sipuncula, Phascolionidae) (1997)
    Springer
    Zoomorphology 117 (1997), S. 23-31 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The ultrastructure of the nuchal organ and cerebral organ is described for the first time in a species of the Sipuncula, Onchnesoma squamatum. The nuchal organ is an unpaired structure lying outside and dorsal to the tentacular crown; furrows give the organ a paired appearance. The cerebral organ is an unciliated pad anterior to the nuchal organ. The nuchal organ consists of ciliated supporting cells, non-ciliated supporting cells and bipolar primary sensory cells. The cerebral organ is composed of unciliated supporting cells and numerous bipolar sensory cells. This clearly favours the hypothesis that this structure has a sensory function in adults rather than being a vestige of a larval organ. The sensory cells are similar in both organs and exhibit features indicative of chemoreception. Since the density of the sensory cells is low in the nuchal organ, an exclusively sensory function is questioned. There is some evidence that the two organs represent a functional unit. The present findings do not support the view that the nuchal organs of Sipuncula and ”Polychaeta” are homologous, but instead suggest that they are convergent structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004350050026
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructure of the cephalic sensory organs of adult Pycnophyes dentatus and of the first juvenile stage of P. kielensis (Kinorhyncha, Homalorhagida) (1997)
    Springer
    Zoomorphology 117 (1997), S. 33-40 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The ultrastructure of the paired cephalic sensory organs of adult Pycnophyes dentatus and of the first juvenile stage of P. kielensis (Kinorhyncha, Homalorhagida) was investigated by TEM. In both species, each sensory organ is composed of one receptor cell and one enveloping cell which border a common intercellular lumen. A single receptor cilium extends from the receptor cell into this lumen. The cilium expands behind the basal body and branches into numerous processes. A pair of cephalic sensory organs with these characteristics belongs to the ground pattern of, at least, the Pycnophyidae. The sensory organs of these Kinorhyncha correspond closely with the anterior cephalic organs of the Gastrotricha, but differ from the known cephalic receptors of other Nemathelminthes. Currently, it cannot be evaluated conclusively whether the last common ancestor of the Nemathelminthes possessed cephalic sensory organs and, if it did, what these organs looked like.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004350050027
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  • 9
    Electronic Resource
    Electronic Resource
    Epidermal ultrastructure of Seison nebaliae and Seison annulatus, and a comparison of epidermal structures within the Gnathifera (1997)
    Springer
    Zoomorphology 117 (1997), S. 41-48 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The epidermis of both species of Seison is syncytial and has a characteristic internal layer divided into two distinct sublayers. Sublayer I is very thin (0.03 μm) and bounded to the outer cell membrane of the epidermis. Sublayer II is 0.5 μm thick and separated from sublayer I by a thin layer of cytoplasm. Intrusions of the outer cell membrane of the epidermis perforate the internal layer, before terminating within the cytoplasm. The intrusions of the cell membrane of S. annulatus are coated by an electron-dense material, the annulus, when passing through the internal layer. Bundles of filaments are present in the epidermis of S. nebaliae. A comparison of epidermal structures within the Gnathifera Ahlrichs, 1995, confirms phylogenetic relationships earlier proposed by the author.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004350050028
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  • 10
    Electronic Resource
    Electronic Resource
    Transport-active organs within the ’ano-genital’ capsule of Craterostigmus tasmanianus (Chilopoda, Craterostigmomorpha) (1997)
    Springer
    Zoomorphology 117 (1997), S. 49-52 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In Craterostigmus tasmanianus, first results of the cellular organization of anal organs within the ’ano-genital’ capsule are presented. Each valve of the ’ano-genital’ capsule bears four pore fields ventrally, each of them consisting of several pore openings of the anal organs. The pores lead into a cuticle-lined pore channel, the base of which is surrounded by a single-layered epithelium that is composed of three different cell types. The main epithelium consists of radially arranged transport-active cells surrounded by exocrine cells, and the cells of the pore channel. The cells of the transporting epithelium show deep invaginations of the apical and basal cell surfaces and plasmalemma-mitochondrial complexes. These cells are covered by a specialized cuticle with a prominent subcuticle. Exocrine glands secrete a mucous layer on the cuticle of the main epithelium. The type of anal organ present in Craterostigmus tasmanianus shows similarities to coxal and anal organs found in other Pleurostigmophora in the chilopods. The possible function of the anal organs in uptaking water vapour is discussed. It is appropriate to call the organs within the ’ano-genital’ capsule of Craterostigmus tasmanianus ”anal organs”, as components of the genital segments are not involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004350050029
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