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Differential ascending projections from neurons in the cat's lateral cervical nucleus (1994)

Djouhri, L. ; Brown, A. G. ; Short, A. D.

Springer

Experimental brain research 101 (1994), S. 375-384

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ISSN: 1432-1106

Keywords: Lateral cervical nucleus ; Ascending projections ; Cat

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Extracellular microelectrode recordings were made from single cells of the lateral cervical nucleus (LCN) in cats anaesthetized with chloralose and paralysed with gallamine triethiodide. The cells were tested for antidromic activation from the contralateral medial lemniscus and the contralateral tectum. Seventytwo LCN units were recorded which projected to one or both targets. Sixty (83%) projected through the medial lemniscus, and of these 36 (50% of the total) also projected to the tectum, whereas 24 (33%) projected through the medial lemniscus only; 12 (17%) projected only to the tectum. Twenty-nine units (40%) were excited by moving hairs of the coat but not by pinch of the skin, and 9 (31%) of these projected to the tectum, 11 (38%) through the medial lemniscus and 9 (31%) to both targets. Forty units (56%) were excited by hair movement and noxious pinch, and 3 (7%) of these projected to the tectum, 10 (25%) through the medial lemniscus and 27 (68%) to both targets. Three units (4%) had no discernible receptive fields and they all projected through the medial lemniscus, but not to the tectum. Of the 12 units projecting only to the tectum, 11 had receptive fields completely or partially on the trunk. Units projecting either through the medial lemniscus only, or through the medial lemniscus and also into the tectum, had receptive fields more widely distributed: these included small fields on the fore- and hind feet, on the limbs and also, a minority, on the trunk. Units with glove- or stocking-like receptive fields projected through the medial lemniscus. The results show that while most LCN cells project through the medial lemniscus, those excited by hair movement alone preferentially project either to the tectum or through the medial lemniscus, but not by both routes. The differences in receptive field properties of the differently projecting units are discussed in terms of the possible functions of the spinocervical system.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00227331

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Vergleich von Bauteil- und Laboratoriumsversuchen im System Baustahl-H2S-haltige, feuchte Gase bzw. wäßrige PrüflösungenHerrn Professor Dr. Wilhelm Schwenk zum 60. Geburtstag gewidmet (1991)

Bennett, C. ; Brown, A. ; Pöupperling, R. ; [et al.]

Weinheim [u.a.] : Wiley-Blackwell

Materials and Corrosion/Werkstoffe und Korrosion 42 (1991), S. 505-510

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ISSN: 0947-5117

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Description / Table of Contents: Full scale tests and laboratory tests of low alloy steels in wet and liquid H2S containing environmentsThe results of five hydrogen induced cracking(HIC)-Round Robin tests of steels exhibiting different levels of HIC susceptibility involving nine laboratories and a smaller number of hydrogen induced stress corrosion cracking (HSCC)-Round Robin tests are presented. These results are compared with the results of full scale tests using the same steels and the same liquid environment as in the Round Robin tests. This full scale tests were followed by full scale tests with humidified gaseous environments saturated with H2S and CO2.

Notes: Es werden die Ergebnisse von Ringversuchen an 5 niedriglegierten, hochfesten Röhrenstählen unterschiedlicher HIC-Beständigkeit zur Bestimmung deren Wasserstoff-induzierter Spannungsrißkorrosionsbeständigkeit und der HIC-Beständigkeit in üblichen H2S gesättigten, wäßrigen Prüflösungen mit pH 3 bzw. 5 unter Beteiligung von bis zu 9 Laboratorien beschrieben. Diese Ergebnisse werden mit Bauteilversuchen unter Verwendung der gleichen wäßrigen Prüflösung und weiteren Bauteilversuchen mit feuchten, H2S und CO2 enthaltenden Gasen verglichen.

Additional Material: 9 Ill.