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- Allwood, Jens, 1947
(författare)
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Truth, Appropriateness and Focus
- 1974
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Ingår i: In: Dahl (ed.) "Topic and Comment, Contextual Boundness and Focus". Hamburg: Buske. - 3871181668
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Tidskriftsartikel (refereegranskat)
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- Burke, R. E., et al.
(författare)
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A comparison of peripheral and rubrospinal synaptic input to slow and fast twitch motor units of triceps surae
- 1970
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Ingår i: The Journal of Physiology. - : Wiley. - 0022-3751 .- 1469-7793. ; 207, s. 709-732
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Tidskriftsartikel (refereegranskat)abstract
- 1. Post‐synaptic potentials (PSPs) evoked by electrical stimulation of a variety of input systems have been compared in triceps surae motoneurones innervating slow and fast muscle units, the speed of contraction of which was also determined. 2. Stimulation of high threshold afferents in both flexor and extensor muscle nerves, and of joint afferents, evoked polysynaptic PSPs which were predominantly hyperpolarizing in both fast and slow twitch motor units. 3. Volleys in cutaneous afferents in the sural and saphenous nerves evoked polysynaptic PSPs composed of mixtures of inhibitory and excitatory components. The inhibitory components were predominant in slow twitch motor units, while in fast twitch units there was a trend towards excitatory predominance. 4. Repetitive stimulation of the red nucleus caused predominantly inhibitory PSPs in slow twitch units and mixed or predominantly excitatory PSPs in fast twitch units. There was a correlation in the excitatory/inhibitory balance between PSPs of cutaneous and rubrospinal origin in those motoneurones in which both types of PSPs were studied. 5. The amplitudes of group Ia disynaptic inhibitory PSPs were found to be correlated with motor unit twitch type: IPSPs in slow twitch units were larger than those in fast twitch units. Rubrospinal conditioning volleys were found to facilitate group Ia IPSPs in both fast and slow twitch motor units. 6. The results suggest that there may be several basic patterns of synaptic input organization to motoneurones within a given motor unit pool. In addition to quantitative variation in synaptic distribution, there is evidence that qualitative differences in excitatory to inhibitory balance also exist in the pathways conveying input from cutaneous afferents and rubrospinal systems to triceps surae motoneurones. These qualitative differences are correlated with the motor unit twitch type. © 1970 The Physiological Society
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- Dave, Göran, 1945, et al.
(författare)
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Metabolic and hematological studies on the yellow and silver phases of the European eel, Anguilla anguilla L.—II. Fatty acid composition
- 1974
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Ingår i: Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. - 1096-4959 .- 1879-1107. ; 43:3, s. 583-591
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Tidskriftsartikel (refereegranskat)abstract
- 1.1. Fatty acid composition in liver, muscle and gonads of yellow and silver phases of the European eel (Anguilla anguilla L.) was determined by gas-liquid chromatography (GLC). 2.2. Significantly higher amounts of were found in the gonads of silver eels compared to yellow eels. 3.3. In the gonads of silver eels the amounts of the unsaturated acids, palmitoleic (16:1), oleic (18:1) and linoleic (18:2), were significantly higher while the amount of palmitic acid (16:0) was significantly lower. 4.4. In the liver the amount of stearic (18:0) and arachidonic acid (20:4) was significantly lower, while the amount of linoleic acid (18:2) was significantly higher in the silver phase.
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- Emonet‐Dénand, Françoise, et al.
(författare)
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Skeleto‐fusimotor fibres in the rabbit
- 1970
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Ingår i: The Journal of Physiology. - : Wiley. - 0022-3751 .- 1469-7793. ; 210, s. 669-680
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Tidskriftsartikel (refereegranskat)abstract
- 1. In rabbits, repetitive stimulation of single motor axons to lumbrical muscles elicits both a contraction of extrafusal muscle fibres and an increase in the discharge frequency of spindle primary endings. 2. This activation of the sensory endings can be attributed to the contraction of intrafusal muscle fibres because it persists after the contraction of extrafusal muscle fibres has been suppressed by selective curarization of their neuromuscular junctions. 3. In non‐curarized preparations the frequency of most of the afferent discharges continues to increase when rates of stimulation of motor fibres exceed the tetanic fusion frequency of the extrafusal muscle fibres. 4. The effect of repetitive stimulation of motor fibres that supply extrafusal and intrafusal muscle fibres was studied on the responses of primary endings to phasic stretch. Of twelve fibres, eight were found to exert a dynamic effect and four a static one. 5. Selective curarization of the extrafusal neuromuscular junctions does not modify the nature of the static and dynamic effects. © 1970 The Physiological Society
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