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  • Springer  (42)
  • 2020-2022
  • 1990-1994  (16)
  • 1985-1989  (12)
  • 1980-1984  (14)
  • 1955-1959
  • 1
    Electronic Resource
    Electronic Resource
    Effect of 11R, 16, 16-trimethyl prostaglandin E2 on meal-stimulated gastric acid secretion in duodenal ulcer subjects (1986)
    Springer
    European journal of clinical pharmacology 31 (1986), S. 281-284 
    Details
    ISSN: 1432-1041
    Keywords: duodenal ulcer ; prostaglandin E2 ; gastric acid secretion ; gastrin ; trimethylprostaglandin E2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of varying oral doses of 11R, 16, 16-trimethyl prostaglandin E2 (TmPGE2) on meal-stimulated gastric acid secretion and serum gastrin concentrations was studied in 10 male subjects with asymptomatic duodenal ulcer disease. A liquid protein meal was infused intragastrically 0.5 h and 3.5 h after drug administration. TmPGE2 inhibited gastric acid secretion in a dose dependent manner during the first meal and no significant effect was observed during the second meal. Except for the highest dose, no TmPGE2 was detected in plasma 3 h after drug administration. The degree of inhibition of meal-stimulated gastric acid was positively correlated with the plasma level of TmPGE2, but it was not due to inhibition of postprandial gastrin release. The results indicate that oral TmPGE2 inhibits meal-stimulated gastric acid secretion but not gastrin release in humans with asymptomatic duodenal ulcer disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00981124
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  • 2
    Electronic Resource
    Electronic Resource
    A thermodynamic model of deposition by etching-enhanced reactive sputtering (1991)
    Springer
    Plasma chemistry and plasma processing 11 (1991), S. 439-453 
    Details
    ISSN: 1572-8986
    Keywords: Reactive sputtering ; thermodynamic modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Deposition by etching-enhanced reactive sputtering (DEERS) is believed to be a three-step process: plasma etching of a sputtering target, transport of volatile etch products to a substrate, followed by conversion of etch products adsorbed on the substrate to form a desired film material. While there are undoubtedly kinetic factors involved in this process, results of a thermodynamic analysis of the above process as a sequence of two chemical equilibrium reactors (target and substrate) correlates well with available experiments on oxide deposition and with optimum ratios of etchant to oxidant gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447158
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  • 3
    Electronic Resource
    Electronic Resource
    Fine structure of the larval eyes of Rostanga pulchra (Mollusca, Opisthobranchia, Nudibranchia) (1983)
    Springer
    Zoomorphology 102 (1983), S. 1-10 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The eyes of Rostanga pulchra larvae develop immediately behind the velar lobes approximately 20 days after hatching. Each is a pigmented cup with a lens occupying the concavity of the cup. The eye is composed of a single corneal cell, 7 sensory cells and 8 pigment cells. Sensory cells are of the rhabdomeric type and bear microvilli as their receptive surface. The eye connects to the inner dorsal region of the optic ganglion through a nerve that consists of axons arising from the 7 sensory cells. The optic ganglion, in turn, joins the lateral region of the cerebral ganglion. The possible functions of the eye are discussed in relation to larval behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310729
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  • 4
    Electronic Resource
    Electronic Resource
    Spermiogenesis in Polyplacophora, with special reference to acrosome formation (Mollusca) (1990)
    Springer
    Zoomorphology 109 (1990), S. 179-188 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The present study examines spermiogenesis, and in particular the formation of the acrosome, in ten species of chitons belonging to four families. This study emphasizes the formation of the acrosome but brings to light several other structures that have received little or no mention in previous studies. The process of spermiogenesis is essentially similar in each species, although Chaetopleura exhibits some significant differences. In early spermiogenesis the Golgi body secretes numerous small pro-acrosomal vesicles that gradually migrate into the apical cytoplasm. The chromatin condenses from granules into fibres which become twisted within the nucleus. A small bundle of chromatin fibres projects from the main nuclear mass into the anterior filament; this coincides with the appearance of a developing manchette of microtubules around the nucleus that originates from the two centrioles. Radiating from the distal centriole is the centriolar satellite complex, which is attached to the plasma membrane by the annulus. The distal centriole produces the flagellum posteriorly and it exits eccentrically through a ring of folded membrane that houses the annulus. Extending from the annulus on one side of the flagellum, in all but one species, is a dense fibrous body that has not been previously reported. The proximal centriole lies perpendicular to the end of the distal centriole and is attached to it by fibro-granular material. Pro-acrosomal vesicles migrate anteriorly through the cytoplasm and move into the anterior filament to one side of the expanding nucleus. Eventually these vesicles migrate all the way to the tip of the sperm, where they fuse to form one of two granules in the acrosome. In mature sperm the nucleus is bullet-shaped with a long anterior filament and contains dense chromatin with occasional lacunae. The mitochondria vary in both number and position in the mature sperm of different species. Both centrioles are housed eccentrically in a posterior indentation of the nucleus, where the membranes are modified. The elongate flagellum tapers to a long filamentous end-piece that roughly corresponds to the anterior filament and may be important in sperm locomotion for hydrodynamic reasons. An acrosome is present in all ten species and stained positively for acid phosphatase in three species that were tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312469
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  • 5
    Electronic Resource
    Electronic Resource
    Fine structure of the cephalic sensory organ in the larva of the nudibranch Rostanga pulchra (Mollusca, Opisthobranchia, Nudibranchia) (1984)
    Springer
    Zoomorphology 104 (1984), S. 131-139 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cephalic sensory organ in the veliger larva of Rostanga pulchra is situated dorsally between the rhinophores, emerging as a tuft of cilia. This organ is made up of three types of sensory cells, and based on their morphology have been termed ampullary, parampullary and ciliary tuft cells. The cell bodies of the organ originate in the cerebral commissure, and their dendrites pass to the epidermis as three tracts. Dendrites terminate in the epidermis to form a sectorial field. Axons of these cells run into the mass of neurites in the cerebral commissure but no synapses were observed in this area. Morphological evidence suggests that the cephalic sensory organ may function in chemoreception and mechanoreception related to substrate selection at settlement, feeding, or other behaviors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312131
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  • 6
    Electronic Resource
    Electronic Resource
    The fine structure of the newly discovered propodial ganglia of the veliger larva of the nudibranch Onchidoris bilamellata (1989)
    Springer
    Cell & tissue research 256 (1989), S. 17-26 
    Details
    ISSN: 1432-0878
    Keywords: Larval development ; Ganglia, invertebrate ; Onchidoris bilamellata (Mollusca, Nudibranchia)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two pairs of ganglia are found in the propodial region of the veliger of Onchidoris bilamellata: the anterolateral pair is located at the foremost corners of the propodium, and the frontal pair is located beside the propodial midline. Both sets of ganglia are positioned below the epidermis, and they are joined to the cerebral ganglia by large, common connectives. Each ganglion possesses sensory cells, nerve cells and sheath cells, and the frontal pair contains a complement of secretory cells. Externally, the propodial ganglia are manifested as sensory fields. The fields of the anterolateral pair are elliptical in shape, and each appears as a band of cilia bordering an unciliated zone. The region devoid of cilia is composed of ordinary epidermal cells, whereas the ciliated portion is comprised of dendritic endings originating from cells in the ganglion. Dendrites arise from one type of sensory cell and pass through the epidermis in bundles. Each dendrite terminates as a single cilium at the epidermal surface. Sensory fields of the frontal ganglia are key-shaped and oppose one another on the anterior end of the foot. Each field appears as a flat, circular, unciliated region which extends into a ciliated groove that runs dorsally toward the mouth. The groove contains the terminals of secretory cells, ciliated sensory cells, and the cell bodies of nonciliated sensory cells. The nonciliated sensory cells, characterized by a microvillous apex, are the dominant cells in the flattened circular zone. The space between the frontal ganglia and the epidermis is bridged by bundles of processes which are similar to those of the anterolateral ganglia. However, these tracts contain collections of the apical processes of secretory cells, the dendrites of ciliated sensory cells, and the axons of nonciliated sensory cells. Morphological and behavioral evidence indicates that the propodial ganglia serve a chemosensory function during settlement and metamorphosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224714
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  • 7
    Electronic Resource
    Electronic Resource
    High-energy electron pair production on oxygen (1991)
    Springer
    International journal of theoretical physics 30 (1991), S. 1235-1248 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron-positron pair production cross sections are calculated for 50-MeV electrons incident on an oxygen nucleus. The symmetric coplanar cross sections are emphasized. Neglecting exchange, the spectra of forward-scattered projectile electrons is numerically calculated. In the extreme relativistic and nonrelativistic limits for the produced pair kinetic energies, calculated cross sections are similar to those of Bhabha.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00671010
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  • 8
    Electronic Resource
    Electronic Resource
    Interfacial stress state present in a “thin-slice” fibre push-out test (1992)
    Springer
    Journal of materials science 27 (1992), S. 3821-3826 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An analysis of the stress distributions along the fibre-matrix interface in a “thin-slice” fibre push-out test is presented for selected test geometries. For the small specimen thicknesses often required to displace large-diameter fibres with high interfacial shear strengths, finite element analysis indicates that large bending stresses may be present. The magnitude of these stresses and their spatial distribution can be very sensitive to the test configuration. For certain test geometries, the specimen configuration itself may alter the interfacial failure process from one which initiates due to a maximum in shear stress near the top surface adjacent to the indentor, to one which involves mixed mode crack growth up from the bottom surface and/or yielding within the matrix near the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545464
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  • 9
    Electronic Resource
    Electronic Resource
    Fine structure of the larval rhinophores of the nudibranch, Rostanga pulchra, with emphasis on the sensory receptor cells (1982)
    Springer
    Cell & tissue research 225 (1982), S. 235-248 
    Details
    ISSN: 1432-0878
    Keywords: Rhinophore ; Larva ; Nudibranch ; Sensory cell ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The rhinophores of the veliger larva of Rostanga pulchra are located in the intravelar field near the base of the velar lobes. Each rhinophore is a cylindrical structure, tapering distally, and covered with a dense meshwork of microvilli. A conspicuous row of ciliary tufts runs along each side of the rhinophore and several stiffer tufts, composed of fewer cilia, are positioned around the tip or at the base. The rhinophoral epithelium consists of supporting cells, ciliated cells (giving rise to the ciliary rows), dendritic terminals (giving rise to the tufts around the apex), and sinuses containing occasional amebocytes. The lumen of the rhinophore is occupied by the rhinophoral ganglion and muscle cells that are oriented in two perpendicular planes. Cell bodies of the dendritic endings are located within the rhinophoral ganglion, which in turn joins into the optic and cerebral ganglia. Rhinophoral ganglionic neurons do not synapse with each other, but numerous neuromuscular synapses are found in the lumen of the rhinophore. Morphological evidence suggests that the dendritic endings are chemoreceptors and the ciliated cells are possibly mechanoreceptors but are not functional at this stage in development. The functional role of the rhinophores is discussed in relation to larval behavior at settlement and metamorphosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214678
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  • 10
    Electronic Resource
    Electronic Resource
    A new direct biaxial testing machine for anisotropic materials (1994)
    Springer
    Experimental mechanics 34 (1994), S. 1-9 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A screw-driven new biaxial testing machine for the realization of experimental investigations on anisotropic sheet materials, such as composite plates or rolled sheet metals, is presented. The described mechanical concept and servocontrol system allow cruciform specimens to be subjected to large strain biaxial tensile and compressive tests without kinematic incompatibilities. Moreover, for the proper implementation of biaxial tensile tests, the specific problems linked to the anisotropic properties of the investigated materials are taken into account; therefore, for the first time, the biaxial machine is supplied with the original ‘off-axes testing device,’ consisting of hinged fixtures with knife-edges at each arm of the cruciform specimen. A recently developed optimization method for the optimal design of flat tensile cruciform specimens is shortly reviewed. Numerical simulations illustrate the decisive superiority of the optimized specimen compared with specimen designs proposed in the literature, as well as the necessity to use the ‘off-axes’ testing technique in biaxial tests on anisotropic materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328435
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