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  • 1
    Electronic Resource
    Electronic Resource
    Sensory innervation of the Achilles tendon by group III and IV afferent fibers (1985)
    Springer
    Anatomy and embryology 172 (1985), S. 145-156 
    Details
    ISSN: 1432-0568
    Keywords: Afferent nerve fiber ; Nociceptor ; Sensory terminal ; Tendon innervation ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In sympathectomized cats the innervation of the Achilles tendon by fine afferent nerve fibers was studied with semithin and ultrathin sections. Several different types of sensory endings of group III and group IV nerve fibers were identified. Of the five different types of endings in the group III range (T III endings), two are located within vessel walls. One of them ends in the circumference of the venous vessels (T III/VV). Its lanceolate terminals have characteristic receptor areas at their edges. The second type ends in the adventitia of lymphatic vessels (T III/LV). Its receptive areas are scattered along their terminal course. Two further group III endings ramify within the connective tissue compartments of the vessel-nerve-fascicles of the peritenonium externum and internum. One type is tightly surrounded by collagen fibrils (T III/PTic); the other terminates between the collagen fiber bundles (T III/PTgc). The latter arrangement recalls the ultrastructural relation between nerve terminals and collagen tissue in Golgi tendon organs. The fifth type innervates the endoneural connective tissue of small nerve fiber bundles (T III/EN). At least some of them come into close contact with bundles of collagen fibers which penetrate the perineural sheath to terminate within the endoneurium. The endings of group IV afferents (T IV endings) show a striking topographic relationship to the blood and lymphatic vessels of all connective tissue compartments of the Achilles tendon. They form penicillate endings which may contain granulated vesicles. In any event, they can easily be discriminated from the T III endings in the vessel walls. In close neighborhood to Remak bundles, a cell has been regularly found which fulfilled all ultrastructural criteria for mast cells. But this cell is not a mast cell proper because it is surrounded by a basal lamina (pseudo mast cell).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319597
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  • 2
    Electronic Resource
    Electronic Resource
    Degeneration patterns of postganglionic fibers following sympathectomy (1985)
    Springer
    Anatomy and embryology 172 (1985), S. 133-143 
    Details
    ISSN: 1432-0568
    Keywords: Wallerian degeneration ; Muscle nerve ; Postganglionic nerve fiber ; Ramus communicans griseus ; Sympathectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In cats the time course of degeneration following lumbal sympathectomy was studied in the ramus communicans griseus (reg) and in the nerves to the triceps surae muscle using light and electron microscopic methods. The left lumbar sympathetic trunk including its rami communicantes was removed from L2 to S1 using a lateral approach. The animals were sacrificed between 2 and 48 days after the sympathectomy. Tissue samples were taken (a) one cm proximal to the entrance of the rcg into the spinal nerve, and (b) one cm proximal to the entrance of the nerve into the muscle belly. In the reg signs of degeneration can already be recognized in the myelinated as well as in the unmyelinated axons 48h after sympathectomy. The degenerative processes in the axons reach their peak activity at about 4 days p.o. They end a weck later. Signs of the reactions of the Schwann cells and of the endoneural cells can first be seen 2 days p.o. They are most pronounced around the 8th day p.o., and last at least up to the third week. Thereafter the cicatrization processes settled to a rather steady state (total observation period 7 weeks). In the muscle nerves the first signs of an axonal degeneration of the sympathetic fibers can be recognized 4 days after surgery. The signs of axonal degeneration are most striking about 8 days p.o. They have more or less disappeared another week later. The reactions of the Schwann cells also start on the fourth day but outlast the degenerative processes by some 8 days. Thus the degenerative and reactive processes in the reg precede those in the muscle nerves by 2 days early after surgery and by 6 days 3 weeks later. Seven weeks after surgery, fragments of folded basement lamella and Remak bundles with condensed cytoplasm and numerous flat processes are persisting signs of the degeneration. In addition to the differences in time course between the proximal and the distal site of observation, it was also noted that both the axonal degeneration and the reactions of the Schwann cells are more pronounced in the rcg than in the muscle nerve. For example there was abundant mitotic activity in the central endoneural and Schwann cells whereas we could not detect such activity in the periphery. It is concluded that the time course of degeneration and the intensity of the degenerative and reactive processes is, to a considerable extent, determined by the distance between the site of nerve section and the site from which the specimen is taken. Many of the conflicting data in the literature can be explained by this finding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319596
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  • 3
    Electronic Resource
    Electronic Resource
    The fine structure of ampullary and tuberous electroreceptors in the South American blind catfish Pseudocetopsis spec (1988)
    Springer
    Anatomy and embryology 177 (1988), S. 523-535 
    Details
    ISSN: 1432-0568
    Keywords: Ampullary electroreceptor ; Tuberous electroreceptor ; Sensory innervation ; Scanning and transmission electronmicroscopy ; Pseudocetopsis spec. (catfish)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two types of electroreceptors, the ampullary and the tuberous electroreceptor (silurid knollenorgan) in the epidermis of the catfish, Pseudocetopsis spec., were investigated with semithin and ultrathin serial sections. The ampullary organ contains one or two sensory cells which are embedded in supporting cells at the base of open epithelial canals. They bear some slender microvilli on their apical surface and form several synaptic bars. The afferent myelinated nerve fiber arborizes in the connective tissue papilla and looses its myelin sheath about 30 μm below the supporting cell layer. A second thin myelinated axon occur up to the supporting cell layer. The tuberous electroreceptor organ contains one large receptor cell. Most of the cell body is exposed to the lumen of a specialized proximal canal segment and is closely covered with microvilli. A single myelinated axon looses its myelin sheath within the supporting cell layer about 1 μm before terminating as a flat calyx at the base of the sensory cell. A functional significance of the two types of receptors will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305139
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  • 4
    Electronic Resource
    Electronic Resource
    Nerve fibres and their terminals of the dura mater encephali of the rat (1987)
    Springer
    Anatomy and embryology 175 (1987), S. 289-301 
    Details
    ISSN: 1432-0568
    Keywords: Dura mater encephali ; Sensory receptors ; Nerve fibres ; Vascular bed ; Lymphatic vessel ; Nociception ; Headache
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The dura mater encephali of the rat is richly supplied by myelinated (A-axons) and unmyelinated (C-axons) nerve fibres. For the supratentorial part the main nerve supply stems from all three branches of the trigeminal nerve. Finally, 250 myelinated and 800 unmyelinated nerve fibres innervate one side of the supratentorial part. The vascular bed of the dura mater exhibits long postcapillary venules up to 200 μm in length with segments of endothelial fenestration. Lymphatic vessels occur within the dura mater. They leave the cranial cavity through the openings of the cribriform plate, rostral to the bulla tympani together with the transverse sinus, and the middle meningeal artery. The perineural sheath builds up a tube-like net containing the A- and C-axons. It is spacious in the parietal dura mater and dense at the sagittal sinus along its extension from rostral to caudal and at the confluence of sinuses. Terminals of both the A- and C-axons are of the unencapsulated type. Unencapsulated Ruffini-like receptors stemming from A-axons are found in the dural connective tissue at sites where superficial cerebral veins enter the sagittal sinus and at the confluence of sinuses. The terminations of single A-axons together with C-fibre bundles mix up in their final course in one Schwann cell to build up multiaxonal units or terminations (up to 15 axonal profiles). A morphological differentiation is made due to the topography of these terminations; firstly, in different segments of the vascular bed: postcapillary venule, venule, the sinus wall, lymphatic vessel wall, and secondly, within the dura mater: inner periosteal layer, collagenous fibre bundles of the meningeal layer and at the mesothelial cell layer of the subdural space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309843
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  • 5
    Electronic Resource
    Electronic Resource
    Quantum and semiclassical oscillations in the organic metal (BEDO-TTF)2Clx(H2O)y (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 621-627 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study quantum (Shubnikov-de Haas and de Haas-van Alphen) oscillations and angular oscillations of the reluctance in the organic quasi-two-dimensional metal (BO)2Clx(H2O)y. We show that the Fermi surface in this compound consists of a slightly corrugated cylinder with its axis perpendicular to the conducting plane. The cross section of the cylinder in this plane is a perfect circle of radius k F≃3×107 cm−1. The effective carrier mass associated with this cylinder is m*=(1.65–2.0) m 0 in the conducting plane, while the Dingle temperature is T D=3–4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558702
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  • 6
    Electronic Resource
    Electronic Resource
    Galvanomagnetic properties of the new organic metal ET2TlHg(S0.45Se0.55CN)4 (1997)
    Springer
    Journal of experimental and theoretical physics 85 (1997), S. 1192-1195 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetoresistance and magnetic torque have been studied in the single crystals of the mixed complex (ET)2TlHg(S0.45Se0.55CN)4. The quantum oscillations (Shubnikov-de Haas and de Haas-van Alphen) have been observed and investigated in details in this compound. The behavior of these oscillations is close to that in the complex (ET)2TlHg(SeCN)4 but is characterized by a stronger carrier scattering induced by the disordered positions of the S and Se atoms in the anion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558392
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  • 7
    Electronic Resource
    Electronic Resource
    de Haas-van Alphen oscillations and angular magnetoresistance oscillations in the organic metal κ-(BETS)2GaCl4 (1999)
    Springer
    Journal of experimental and theoretical physics 88 (1999), S. 114-117 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Quantum de Haas-van Alphen oscillations and semiclassical angular magnetoresistance oscillations are observed in the quasi-two-dimensional organic metal κ-(BETS)2GaCl4. The behavior of these oscillations attests to the existence of two cylindrical Fermi surface sheets with axes perpendicular to the conducting plane. The cross-sectional areas of these cylinders in the conducting plane are equal to about 20 and 100% of the corresponding cross section of the Brillouin zone. It is shown that the many-particle interaction can be suppressed significantly in this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558772
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  • 8
    Electronic Resource
    Electronic Resource
    A novel and sensitive Faraday-type magnetometer for the field range from 0 to 12 T (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3755-3760 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Faraday-type magnetometer is described in which the magnetic force is measured capacitively by monitoring the displacement of a spring-suspended quartz sample holder. A double gradient coil is used in order to compensate the force on the empty sample holder, thus minimizing the background signal. The magnetometer can be used at any temperature down to 1.4 K and has an ultimate sensitivity for magnetic moments of 2×10−6emu (G cm3).© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148022
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  • 9
    Electronic Resource
    Electronic Resource
    Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe13 (1986)
    Springer
    The European physical journal 64 (1986), S. 175-188 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the first measurements of the magnetic-field penetration depth λ in the heavy electron superconductor UBe13, performed using a SQUID magnetometer. We find the temperature dependence of λ(T)-λ(0) to follow aT 2 law at low temperatures, giving further evidence of extreme gap anisotropy in this compound. We calculate the temperature dependence expected for a variety of anisotropic states, including those representing certain classes of “exotic” pairing. In general situations, the supercurrent is not parallel to the vector potential, and a more complicated field penetration takes the place of the normal Meissner effect. We argue that the data are consistent with an energy gap with point nodes on the Fermi surface but inconsistent with the large value of the Landau parameterF 1 S expected for a translationally invariant Fermi liquid with large effective mass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303700
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  • 10
    Electronic Resource
    Electronic Resource
    Specific heat and magnetic susceptibility of UPt3 and UBe13 at mK-temperatures (1995)
    Springer
    The European physical journal 97 (1995), S. 55-58 
    Details
    ISSN: 1434-6036
    Keywords: 74.70.T ; 65.40.E ; 74.30.C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the specific heat capacity of a single crystal of UPt3 in zero magnetic field, in 2 T, and in 4 T (above $$B_{C_2 } $$ )with the adiabatic warm-up method down to a final temperature of 15 mK. The results prove our previous assumption that the normal state of UPt3 exhibits a similar, slightly modified specific heat anomaly around 20 mK as is present in the superconducting state. It is most probably a signature of long range magnetic order. Entropy balance aboveT C is fulfilled if both low-temperature peaks are included. For UBe13 (in the superconducting state) we find no specific heat anomaly down to 24 mK but a deviation from the power law valid at higher temperatures. DC-magnetization measurements on a second single crystal of UPt3 in a SQUID system yield a temperature dependence ∼T 2 between 150 and 20 mK extending the temperature range of earlier measurements by a factor of 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317587
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