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  • 11
    Electronic Resource
    Electronic Resource
    Evaluation of sleep apnea syndrome with low-field magnetic resonance fluoroscopy (1999)
    Springer
    European radiology 9 (1999), S. 1197-1202 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Sleep apnea syndrome ; MR fluoroscopy ; Low-field MR imaging ; Upper airway obstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to assess the upper airway status of sleep apnea syndrome (SAS) patients with low-field MR fluoroscopy. Twenty patients with clinically diagnosed SAS underwent upper airway monitoring using MR fluoroscopy for 5 min while awake and for 30 min while asleep. A 0.064-T permanent-magnet MR imaging system was used for the study. No patients required any sedative drugs because of the very small gradient noise, except in one case. No occlusion was observed while patients were awake. Nine patients showed repeated occlusion at retropalatal (Rp) pharynx, whereas 11 demonstrated both simple Rp occlusion and combined retropalato–retroglossal (Rp + Rg) occlusions (complex occlusion). The mean frequency of occlusion in complex cases was significantly higher than that in simple Rp cases (p 〈 0.05). Low-field MR fluoroscopy was useful in determining the occlusion level while asleep in patients with SAS because of its quiet gantry and long-term monitoring capability. The MR fluoroscopy technique should prove to be a valuable clinical tool for the diagnosis and for determining the appropriate therapy in patients with SAS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050816
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  • 12
    Electronic Resource
    Electronic Resource
    Neural pathways from the vestibular labyrinths to the flocculus in the cat (1975)
    Springer
    Experimental brain research 22 (1975), S. 97-111 
    Details
    ISSN: 1432-1106
    Keywords: Mossy fibers ; Vestibular afferents ; Vestibular nucleus neurons ; Vestibulo-floccular input ; Semicircular input
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In decerebrate, unanesthetized cats, responses in the flocculus were evoked by electric stimulation of the vestibular nerves and by natural stimulation of horizontal head angular acceleration. Field potentials in the flocculus and intracellular recording from Purkinje cells following vestibular nerve stimulation indicated that the responses were produced by mossy fiber inputs. Field potentials evoked from the contralateral labyrinth were as large as those from the ipsilateral one. There was considerable convergence of bilateral labyrinthine mossy fiber inputs to a Purkinje cell. In view of the effects of incision at the midline of the cerebellum and the brain stem, inputs from the contralateral labyrinth were mainly conveyed through the midline of the brain stem and partly through the midline of the cerebellum. Primary vestibular afferents were involved in the transcerebellar crossed pathway. Fibers of the secondary vestibular neurons projecting to the contralateral flocculus were implicated in the brain stem-mediated pathway and, in part, presumably in the transcerebellar crossed pathway. About one-third of the axon spikes examined in the flocculus responded to horizontal head angular acceleration. Commissural inhibition was observed in more than half of the axon spikes in the flocculus which were presumed to be mono- or polysynaptically activated from the vestibular nerve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237682
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  • 13
    Electronic Resource
    Electronic Resource
    The response of horizontal semicircular canal afferents to sinusoidal rotation in the cat (1978)
    Springer
    Experimental brain research 33 (1978), S. 27-39 
    Details
    ISSN: 1432-1106
    Keywords: Horizontal canal afferent ; Resting activity ; Transfer function ; Vestibular nucleus neuron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Dynamic characteristics of primary vestibular afferents innervating the horizontal semicircular canal were studied in decerebrate, unanesthetized cats. Activities of individual afferent fibers were recorded intracranially by glass micropipettes. Frequency of sinusoidal rotation was varied from 0.014 Hz to 0.42 Hz, and phase and gain properties were examined. All of the fibers recorded fired spontaneously, and their firing rate ranged from 7 to 128 spikes/sec. Regularity of firing, phase lags, and gains were calculated in individual fibers. There was a tendency that the units with high spontaneous firing rates showed regular firing, larger phase lags, and lower gains than the units with low spontaneous firing rates. The transfer function of the system (firing rate of the primary afferent per angular acceleration of the head) was $$\frac{{1.98(0.08s + 1}}{{4.1s + 1}}$$ . A high frequency phase lead component was needed to account for the data obtained, indicating a slight deviation from the relationship predicted by the torsion pendulum model. The present phase properties were compared with those of vestibular nucleus neurons reported previously. It was suggested that a group of vestibular nucleus neurons transmits fairly faithfully the phase properties of primary afferents, and that another group of vestibular nucleus neurons receive additional influences from central structures, exhibiting larger phase lags than primary afferents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238792
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  • 14
    Electronic Resource
    Electronic Resource
    Eye movement related activity and morphology of second order vestibular neurons terminating in the cat abducens nucleus (1980)
    Springer
    Experimental brain research 40 (1980), S. 468-473 
    Details
    ISSN: 1432-1106
    Keywords: Inhibitory and excitatory second order vestibular neuron ; Alert cat ; Intracellular HRP ; Abducens nucleus ; Eye movement related activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intracellular records were obtained from axons of second order vestibular neurons in, and around, the left abducens nucleus in alert cats implanted with stimulating electrodes on both vestibular nerves and the left VIth nerve. Twelve secondary vestibular neurons were identified by their increase in firing rate with horizontal head rotation to the left and/or increasing eye position to the right. Following HRP injection, somatic location, axonal trajectory and termination sites were determined. Each of the above cells collateralized extensively in the abducens nucleus in a fashion consistent with their being either inhibitory (n = 7; left) or excitatory (n = 6; right) vestibular neurons in the disynaptic horizontal vestibulo-ocular reflex pathway. These vestibular neurons also arborized extensively in other posterior brainstem eye-movement related areas as well as sending an axon to the spinal cord.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236156
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  • 15
    Electronic Resource
    Electronic Resource
    Neck muscle afferent input to spinocerebellar tract cells of the central cervical nucleus in the cat (1984)
    Springer
    Experimental brain research 55 (1984), S. 286-300 
    Details
    ISSN: 1432-1106
    Keywords: Central cervical nucleus ; Spinocerebellar tract ; Neck muscle afferents ; Spinal cord ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Extracellular and intracellular recordings were made from spinocerebellar tract neurones of the central cervical nucleus (CCN) in C1–C3 segments of the anaesthetized cat. These neurones were identified by antidromic activation from the cerebellar peduncle. Stimulation of the ipsilateral dorsal root elicited extracellular spikes or EPSPs with a monosynaptic latency in almost all CCN neurones in the same segment (segmental input). Late excitatory effects were also observed in about one third of CCN neurones. The monosynaptic EPSP was occasionally followed by an IPSP. The excitatory input from the dorsal root to CCN neurones was extended over several segments for some CCN neurons (extrasegmental input). Monosynaptic excitation was evoked in CCN neurones after stimulation of dorsal neck muscle nerves as well; i.e. splenius (SPL), biventer cervicis and complexus (BCC), rectus capitus dorsalis, and obliquus capitus caudalis. Thresholds for this excitation were near the threshold of the nerve, suggesting that it originated from group I fibres. The component of excitation added after strong stimulation of neck muscle nerves would be attributed to group II fibres. When a CCN neurone received excitatory input from the nerve of one muscle, it was generally not affected by stimulation of other nerves in the same segment. Such muscle specificity of segmental input was the principal pattern of connexion of neck muscle afferents with CCN neurones. In some cases, however, excitatory convergence from SPL and BCC nerves onto single CCN neurones or excitation from the SPL nerve and inhibition from the BCC nerve were also observed. Nearly half of the CCN neurones received input from one muscle nerve of the same segment and not from the afferent of the same muscle of different segments, indicating a segment specificity of input. In the remaining CCN neurones, weaker excitatory effects were induced from afferents of different segments as well. In such extrasegmental effects, inputs to CCN neurones from caudal segments predominated in frequency over those from rostral segments. The origin of extrasegmental input was generally confined to the same muscle. Low threshold muscle afferents from the SPL and BCC were intraaxonally stained with HRP. The collaterals of the stained fibre distributed branchlets and terminals to the CCN, laminae VII, VIII, and motor nuclei. Two fibres responding to local muscle prodding or stretch showed a similar morphology. The findings indicated that muscle spindle afferents from primary endings projected to the CCN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237279
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  • 16
    Electronic Resource
    Electronic Resource
    Magnetic resonance imaging in a juvenile type of distal and segmental muscular atrophy of the upper extremities (1994)
    Springer
    European radiology 4 (1994), S. 119-124 
    Details
    ISSN: 1432-1084
    Keywords: MR ; Cervical myelopathy ; Juvenile amyotrophy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Eight patients with a juvenile type of distal and segmental muscular atrophy of the upper extremities (DSMA), a type of cervical flexion myelophathy, were evaluated using MR imaging. In the neutral position there was no spinal cord compression, but in flexion the spinal cord was displaced anteriorly and was compressed by the posterior surfaces or margins of the vertebrae and/or any herniated disks in all cases. In flexion, compression of the cord was exaggerated in seven patients by the anterior displacement of the posterior margin of the thecal sac, which was accompanied by dilated posterior internal vertebral veins. In patients suspected of having DSMA, MR images made in flexion are regarded essential for verifying the diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231197
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  • 17
    Electronic Resource
    Electronic Resource
    Changes in Adenosine Triphosphate (ATP) Concentration and Its Activity in Murine Tissue After Thallium Administration (1997)
    Springer
    Bulletin of environmental contamination and toxicology 59 (1997), S. 268-273 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900474
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  • 18
    Electronic Resource
    Electronic Resource
    Organization of Photosynthetic Antenna Complex in Lipid Bilayers (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 623-626 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bacterial photosynthetic antenna complexes are composed of α-helical hydrophobicpolypeptides and pigments (e.g., bacteriochlorophyll a). We report here self-assembling properties ofan engineered hydrophobic polypeptide with zinc-substituted bacteriochlorophyll a ([Zn]-BChl a) invarious lipid bilayer to investigate the effect of lipid species on the self-assembling properties. Whenthe polypeptide and [Zn]-BChl a were mixed in surfactant solution (n-octyl β-D-glucopyranoside:OG) at 25°C, the absorption band [Zn]-BChl a was red-shifted from 770 to 812 nm, that is assignableto quasi-dimeric “subunit-type” complex. By subsequent dilution and cooling of the solution, theabsorption band further red-shifted to 836 nm indicative for progressed assembly, ‘LH1-type’complex. When the subunit-type complex was assembled in lipid bilayer, e.g., phosphatidylcholines(PC’s) and phosphatidylglycerol (PG’s), the assembling property to form LH1-type complexprominently depended on the character of their fatty acid chains in the phospholipids. The subunitcomplex remained in the fluidic bilayers, but further assembled to form LH1-type complex insolid-like phospholipid bilayers, suggesting that intermolecular force of phospholipid governs theassembling of the polypeptide/[Zn]-BChl a complex
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.623.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Magnetic resonance imaging of jugular foramen neurinomas (1989)
    Springer
    Acta neurochirurgica 96 (1989), S. 83-87 
    Details
    ISSN: 0942-0940
    Keywords: Jugular foramen neurinoma ; magnetic resonance imaging ; computed tomography ; surgical anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Four cases of jugular foramen neurinoma, extending from the posterior fossa into the temporal bone through the jugular foramen, are reported. The information provided by magnetic resonance imaging was compared with that by computed tomography. Due to the excellent sensitivity, the absence of bone artifacts, and the ease of imaging in any plane, magnetic resonance imaging gave better information particularly about the location of the tumour than X-CT scan did. It included the dumb-bell-shaped tumour through the jugular foramen, the extra-axial nature of the tumour, and the precise anatomical relationships between the tumour and the facial and acoustic nerves or the internal carotid artery. Sagittal and coronal views clearly demonstrated the superior and inferior margins of the tumour. The information is very useful not only for preoperative diagnosis but also for planning the surgical approaches and postoperative follow-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01456163
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  • 20
    Electronic Resource
    Electronic Resource
    An EQCM Study on Corrosion of Iron Thin Film in Deaerated Neutral Solutions (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 192-194 (Aug. 1995), p. 755-764 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.192-194.755.pdf
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