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  • 1
    Electronic Resource
    Electronic Resource
    Continuous Ohmic Polarization Compensator for a Voltammetric Apparatus Utilizing Operational Amplifiers. (1966)
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 382-384 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60235a004
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  • 2
    Electronic Resource
    Electronic Resource
    Correction. Continuous Ohmic Polarization Compensator for a Voltammetric Apparatus Utilizing Operational Amplifiers. (1966)
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 1000-1000 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60240a025
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Theoretical studies of impulse propagation in serotonergic axons (1992)
    Springer
    Biological cybernetics 66 (1992), S. 399-406 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Impulse propagation in small-diameter (1–3 μm) axons with inhomogeneous geometry was simulated. The fibres were represented by a series of 3 μm-long compartments. The cable equation was solved for each compartment by a finite-difference approximation (Cooley and Dodge 1966). First-order differential equations governing temporal changes in membrane potential or Hodgkin-Huxley (1952) conductance parameters were solved by numerical integration. It was assumed that varicosity and intervaricosity segments had the same specific cable constants and excitability properties, and differed only in length and diameter. A single long varicosity or a ‘clump’ of 3 μm-long varicosities changed the point-to-point (axial) conduction velocity within as well as to either side of the geometrically inhomogeneous regions. When 2 μm-diameter, 3 μm-long varicosities were distributed over the 1 μm-diameter fiber length as observed in serotonergic axons, mean axial conduction velocity was between that of uniform-diameter 1 and 2 μm fibers, and changed predictably with different cable parameters. Fibers with inexcitable varicosity membranes also supported impulse propagation. These simulations provided a general theoretical basis for the slow (〈 1 M/s) conduction velocity attributed to small-diameter unmyelinated varicose axons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197719
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  • 4
    Electronic Resource
    Electronic Resource
    Associative recall properties of the trion model of cortical organization (1986)
    Springer
    Biological cybernetics 53 (1986), S. 259-271 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract We developed a cooperative model of the cortical column incorporating an idealized subunit, the trion (which represents a localized group of neurons), and a discrete time step for firing. We found that networks composed of a small number of trions (with symmetric interactions) supported up to thousands of quasi-stable, periodic firing patterns (MPs) which could be selected out with only small changes in interaction strengths using a Hebb-type algorithm. Here we report a study of the associative recall properties showing striking features: By considering all possible initial firing patterns (for a given set of network connections), we find 1) It takes on the average only 2–5 time steps to recall an MP. 2) Many of the MPs can be individually accessed by thousands of different initial patterns. The variety of examples presented illustrate the rich, general nature of the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336996
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  • 5
    Electronic Resource
    Electronic Resource
    The value of MR imaging in differentiating between hard and soft cervical disc disease: a comparison with intraoperative findings (1999)
    Springer
    European spine journal 8 (1999), S. 199-204 
    Details
    ISSN: 1432-0932
    Keywords: Key words Cervical disc disease ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of this study is to assess the accuracy of MRI alone in the differentiation of soft cervical disc protrusion from osteophytic compression in cervical disc disease. In a retrospective study, the MRI scans of 41 patients with cervical disc disease, who had previously undergone surgery, were presented to three independent observers, randomly on two different occasions, to identify the accuracy of the diagnosis of the presence of hard or soft disc or both as a cause of compression. The observers (two neurosurgeons and one neuroradiologist) were not involved with the treatment of the cases at any stage and were unaware of the surgical findings. Their observations were compared with those of the surgeon recorded at operation. The intra-observer agreement was poor for diagnosis into three categories as hard or soft disc or both. In distinguishing between the presence or absence of hard disc, there was moderate to good (Kappa = 0.6) intra observer and fair to moderate (Kappa = 0.4) interobserver agreement. The sensitivity of diagnosis of a hard disc was high (87%) but specificity was low (44%), due to the overestimation of the presence of hard disc. There was a significantly higher incidence of hard disc in the elderly age group (76% over the fifth decade, P = 0.0073). It is concluded that MRI alone is not a very efficient diagnostic tool in distinguishing between hard and soft disc in the cervical disc disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005860050157
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  • 6
    Electronic Resource
    Electronic Resource
    Simultaneous Amplification of Terahertz Difference Frequencies by an Injection-Seeded Semiconductor Laser Amplifier at 850 nm (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 849-858 
    Details
    ISSN: 1572-9559
    Keywords: Semiconductor laser amplifier ; Two-frequency injection seeding ; Difference-frequency generation ; Submillimeter ; Terahertz ; Coherent radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-frequency operation of an 850 nm semiconductor optical amplifier was achieved by simultaneously injection seeding it with two diode lasers. The two frequencies could be independently amplified without strong interference when they were separated by more than 10 GHz, and the spectral purity was preserved by the amplification process. At frequency differences below 10 GHz, unbalanced two-frequency output was observed, which can be explained by a two-mode interaction driven by the refractive index modulation at the beat frequency. The laser system is suitable for the difference-frequency generation of coherent terahertz radiation in ultra-fast photoconductors or nonlinear optical media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022676407601
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  • 7
    Electronic Resource
    Electronic Resource
    Heterophyes nocens Onji & Nishio, 1916 (Digenea: Heterophyidae) from the water rat, Hydromys chrysogaster Geoffroy, 1804 in Australia (1989)
    Springer
    Systematic parasitology 13 (1989), S. 53-61 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A Heterophyes species from the small intestine of the water rat, Hydromys chrysogaster, in Australia is described in detail. The specimens are assigned to H. nocens, a species which many authors believed to be a synonym of H. heterophyes. From this study, H. nocens is considered a valid species as it differs from H. heterophyes in the number of sclerites on the gonotyl, the course of the uterus, coefficients of allometric growth of the suckers and the presence of genital sinus spines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006950
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  • 8
    Electronic Resource
    Electronic Resource
    A revision of the subfamily haplorchinae looss, 1899 (Trematoda: Heterophyidae). III — Genera Cercarioides and Condylocotyla n.g. (1985)
    Springer
    Systematic parasitology 7 (1985), S. 169-197 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The genus Cercarioides Witenberg, 1929 is redefined from studies on its valid species, C. aharonii Witenberg, 1929 and C. ardeolae Oshmarin, 1970. C. aharonii is redescribed from the single type specimen and from new material from Butorides striatus from Kuala Selangor, Selangor, and Kuala Gula, Perak, West Malaysia, and from Hydroprogne caspia and Larus novaehollandiae from Townsville, Queensland, Australia. C. baylisi Gohar, 1930, C. gonacanthodes Deblock, 1966, and C. orientalis Gu et al., 1979 are reduced to synonymy with C. aharonii. A redescription is given of C. ardeolae from Butorides striatus from Kampung Pueh, First Division, Sarawak; Kuala Selangor, Selangor, West Malaysia; Sungai Menggatal, Kota Kinabalu, Sabah; and Pulau Halang, Riau, Sumatra. Condylocotyla pilodora n.g., n.sp., in L. argentatus from the Bay of Marseille, France, differs from other haplorchine genera in its combination of undivided body, absence of gonotyl, genital pore posterior to ventral sucker, discrete lateral pocket with pilose lining, sucker-like ventral sucker armed with spines and sclerotized knobs, and thin-walled seminal vesicle. The life-cycle involves the snail Cerithium vulgatum (natural and experimental) in which magnacercous opisthorchioid cercariae develop in rediae, metacercariae in the pericardial sac of the fish Belone belone, and adults (natural and experimental) in L. argentatus. ac]19831121
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011450
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  • 9
    Electronic Resource
    Electronic Resource
    Contribution à l'étude des Microphallidae (Trematoda), XXXVI,Mochliscotrema n. g. (Gynaecotylinae, Basantisiini) (1986)
    Springer
    Systematic parasitology 8 (1986), S. 173-185 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary The new genus is close toBasantisia Pande, 1938 and is characterized by a vesiculo-prostatic pouch bearing a medially directed dorsal outgrowth, with a powerful muscle inserted apically, lying dorsal to the genital atrium whose genital pore opens dextro-antero-lateral to the ventral sucker (as opposed to postero-median inBasantisia). These trematodes are parasites of the gut of birds in Australia or in the Southern regions bordering on China Sea. Type-species:Mochliscotrema queenslandensis (Deblock and Pearson, 1968) n. comb. fromDacelo novaehollandiae Hermann (Alcedinidae) of Queensland, Australia. Species:M. cryptogrammum n. sp. fromHalcyon chloris Boddaert (Alcedinidae) in Malaysia and Sumatra;Sterna bergii Lichtenstein (Laridae) in Sarawak andSpilornis cheela Latham (Accipitridae) in Sumatra;M. sarawakensis n. sp. fromH. chloris in Buntal (Sarawak). With a similar habitus, the species differ from each other by the anatomical details of their copulatory apparatus. Comparative descriptions and figures of the three species are given. ac]19850705
    Notes: Résumé Le nouveau genre, voisin du genreBasantisia Pande, 1938 est caractérisé par une poche vésiculo-prostatique émettant dans le fond de l'atrium un prolongement transversal étroit évoquant un levier, à l'extrêmité duquel s'insère un muscle puissant. Le pore génital est antéro-latéral dextre par rapport à la ventouse ventrale, tandis qu'il est postéro-médian chezBasantisia. Ces trématodes sont parasites du tube digestif d'oiseaux originaires d'Australie ou de pays périphériques à la Mer de Chine méridionale. Espèce-type:Mochliscotrema queenslandensis (Deblock et Pearson, 1968) n. comb. parasite deDacelo novaehollandiae Hermann (Alcédinidé) du Queensland (Australie). Espèces:M. cryptogrammum n. sp. parasite d'Halcyon chloris Boddaert (Alcédinidé) de Malaysia et de Sumatra; deSterna bergii Lichtenstein (Laridé) du Sarawak et deSpilornis cheela Latham (Accipitridé) de Sumatra;M. sarawakensis n. sp. parasite deH. chloris au Buntal (Sarawak). D'habitus voisins, les trois espèces se distinguent les unes des autres par la conformation différente de détails anatomiques de leur appareil copulateur. Des figures illustrent les différences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009886
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  • 10
    Electronic Resource
    Electronic Resource
    Description of a new zygocercous cercaria (Opisthorchioidea: Heterophyidae) from prosobranch gastropods collected at Heron Island (Great Barrier Reef, Australia) and a review of zygocercariae (1994)
    Springer
    Systematic parasitology 27 (1994), S. 105-125 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The new zygocercous cercaria is described from an intertidal prosobranch gastropod, Clypeomorus batillariaeformis Habe & Kosuge, collected at Heron Island (Great Barrier Reef, Australia). It is of the opisthorchioid type with its oral sucker modified into a penetration organ, eye-spots, seven pairs of prevesicular penetration glands, an oval or rounded epithelial excretory bladder, and a large pigmented tail with dorsal proximal finfold and slender distal portion. Cercariae form large aggregates of up to 700 individuals that swim as one. These assemble in the mantle cavity and escape through the exhalant siphon of the snail. Large aggregates are elongate and hollow, and the cercariae are arranged in a tight spiral at the periphery. The swimming of clusters is performed by simultaneous rotation of the free proximal part of the tails of the cercariae. Aggregates are photopositive. Attempts to infect several species of fish proved unsuccessful. The present account is the eleventh description of a new zygocercous cercaria and the fourth among opisthorchioid trematodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012269
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