Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    Electronic Resource
    Electronic Resource
    Interpretation of the potential fields generated in the cerebellar cortex by a mossy fibre volley (1967)
    Springer
    Experimental brain research 3 (1967), S. 58-80 
    Details
    ISSN: 1432-1106
    Keywords: Mossy fibres ; Cerebellar cortex ; Golgi cells ; Granule cells ; Purkinje cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Potential fields and unitary spikes in the cat cerebellar cortex were generated specifically by mossy fibre volleys and recorded by means of microelectrodes. The mossy fibres were excited by trans-folial (T. F.) stimulation which was compared with juxtafastigial (J.F.) stimulation. Both were conditioned by local stimuli of parallel fibres. 2. In the granular layer, an incoming mossy fibre volley evoked a small diphasic potential (P1 N1) and about 0.4 msec later a second negative wave (N2) due to the excitatory synaptic current generated by synapses of mossy fibres with granule cells and Golgi cells. In the typical configuration the N2 wave usually had a superimposed double spike potential, which is due to impulses discharged first by Golgi cells and then, about 0.5 msec later, by granule cells. 3. The transmission of impulses along the perpendicular axons of the granule cells and thence along the parallel fibres gave the fairly sharp positive potential (P2) in the granular layer, and simultaneously the negative wave (N3) in the molecular layer. The parallel fibre impulses, in turn, synaptically excited and so evoked local responses and action potentials in the dendrites of Purkinje and other cells, which aided in the production of the latter part of the N3 wave. 4. The impulses in the Purkinje cell dendrites propagate into the granular layer via the Purkinje cell somata and axons so producing the negative wave (N4) in the Purkinje and the granular layer. 5. The late and prolonged positive wave (P3) may be attributable to the deep active sources produced by postsynaptic inhibition of Purkinje cells and of granule cells by basket and Golgi cells respectively. 6. There has been good correlation between the physiological findings and the anatomical structures of the various types of cells and the synaptic connections, even to the synapses of mossy fibres on Golgi cell dendrites that have been recently described by HÁmori and SzentÁgothai.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234470
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Development and change of cortical field potentials during learning processes of visually initiated hand movements in the monkey (1982)
    Springer
    Experimental brain research 48 (1982), S. 429-437 
    Details
    ISSN: 1432-1106
    Keywords: Cortical field potential ; Visually initiated movement ; Motor learning ; Monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Field potentials on the surface and at 2.5–3.0 mm depth in the cerebral cortex were recorded in various areas with chronically implanted electrodes and the potentials which preceded hand movements in response to a light stimulus were observed during the process of learning the skilled conditioned movement. A naive monkey had to lift a lever by wrist extension within duration of the light stimulus lasting for 900, 700 or 510 ms depending on the stage of the learning process. In addition to some responses in the striate gyrus, significant short-latency responses to the light stimulus appeared bilaterally in certain areas of the prefrontal and prestriate cortices at an early stage of learning in which the monkey still lifted the lever randomly, and they became gradually larger as the monkey was trained further. Short-latency responses were also often noted in the bilateral premotor cortices during an early stage of learning. When the monkey started to respond to the stimulus by the appropriate movement, early surface-positive (s-P), depth-negative (d-N) premovement potentials appeared in the forelimb motor cortex, and the responses in the premotor cortex increased in size. As the movement became faster and more skillful, late s-N, d-P premovement potentials, that are known to be mediated by the neocerebellum and superficial thalamo-cortical projections, emerged after the early s-P, d-N potentials and became more marked, larger and steeper in the forelimb motor cortex contralateral to the moving hand. All the premovement potentials in the different cortical areas thus developed into steady and constant states and remained so for many months thus maintaining their established patterns. Such successive appearances of premovement field potentials in various cortical areas were related to learning processes of the movement and the implication of these findings was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238619
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Cortical field potentials preceding visually initiated hand movements and cerebellar actions in the monkey (1982)
    Springer
    Experimental brain research 46 (1982), S. 29-36 
    Details
    ISSN: 1432-1106
    Keywords: Premovement cortical potential ; Visually initiated movement ; Cerebellum ; Monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cortical field potentials preceding hand movements initiated by a visual stimulus were recorded with chronically implanted electrodes in premotor, motor and somatosensory cortices of monkeys, and the influences of cerebellar hemispherectomy on cortical potentials as well as reaction time of movements were examined. As reported previously, early surface-positive, depth-negative (2.5–3 mm depth from the cortical surface) premovement potentials emerged at about 40 ms latency after onset of the light stimulus bilaterally in premotor and forelimb motor areas. Early potentials in the forelimb motor area contralateral to the moving hand were followed at about 120 ms latency by surface-negative, depth-positive late premovement potentials which are considered to be mainly composed of superficial thalamo-cortical (T-C) responses. Unilateral hemispherectomy of the cerebellum contralateral to the motor area immediately eliminated the surface-negative, depth-positive potentials. Reaction time from onset of the light stimulus to the hand movement was prolonged by 90–250 ms after cerebellar hemispherectomy. If the dentate and interpositus nuclei were also lesioned, disappearance of the late potentials and delay of the movement continued for many months. However, if the interpositus was spared, there was earlier recovery of reaction time with simultaneous reappearance of the late premovement potentials in the motor cortex. The conclusion is drawn that the cerebellar hemisphere (neocerebellum) activates the motor cortex via superficial T-C projections and participates directly in the initiation of reaction movements in response to an external stimulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238095
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Acyloin condensation in aqueous system by durable polymer-supported thiazolium salt catalysts (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1711-1717 
    Details
    ISSN: 0887-624X
    Keywords: durable catalyst ; thiazolium salt ; aqueous system ; acyloin condensation ; enzyme model ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We characterized three low-molecular-weight thiazolium salt analogues: N-methyl-5-(2′-benzyloxyethyl)-4-methylthiazolium iodide (MBMTI), N-methyl-4-phenylthiazolium iodide (MPTI), and N-methylbenzothiazolium iodide (MBTI). MBMTI, having high-electron density on the thiezolium ring, was found to be a durable thiazolium salt in buffer solution. Then, the polymer-supported thiazolium salt catalyst having MBMTI structure as a catalytic site for acyloin condensation was prepared by the polymerization of the corresponding thiazole monomer and the following quaternization. The polymer catalyst had excellent catalytic activity even in buffer solution, while the corresponding low molecular weight catalyst did not show any activity in aqueous system. Furthermore, the durable polymer catalyst could be reused under the aqueous condition. © 1994 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320913
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Polymerization of vinyl chloride with n-butyl titanate-aluminum alkyls (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 2 (1964), S. 487-489 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.110020502
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...