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  • fish  (2)
  • Docosahexaenoic acid  (1)
  • Phospholipid  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Liposomes from mammalian liver mitochondria are more polyunsaturated and leakier to protons than those from reptiles
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 108 (1994), S. 181-188 
    Details
    ISSN: 0305-0491
    Keywords: Amphibolurus vitticeps ; Basal metabolic rate ; Docosahexaenoic acid ; Evolution of endothermy ; Mitochondria ; Proton conductance ; Rattus norvegicus
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-0491(94)90064-7
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  • 2
    Electronic Resource
    Electronic Resource
    Membrane fatty acid composition of tissues is related to body mass of mammals (1995)
    Springer
    The journal of membrane biology 148 (1995), S. 27-39 
    Details
    ISSN: 1432-1424
    Keywords: Mammals ; Allometry ; Cell membranes ; Phospholipid ; Fatty acids ; Polyunsaturation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Phospholipids were extracted from tissues (heart, skeletal muscle, kidney cortex, liver and brain) of mammals representing a 9,000-fold range in body mass (mouse, rat, rabbit, sheep and cattle) and their fatty acid composition was determined. In heart, skeletal muscle and kidney cortex, there were significant allometric decreases in the Unsaturation Index (UI; average number of double bonds per 100 fatty acid molecules) with increasing body mass. There were significant inverse allometric relationships between body mass and the proportion of docosahexaenoic acid (22∶6ω3) in heart and skeletal muscle. In heart, skeletal muscle and kidney cortex, larger mammals also had shorter fatty acid chains in their phospholipids and a higher proportion of monounsaturates. In liver, smaller mammals had a higher UI than larger mammals (except the rabbit, which had the lowest UI and very low proportions of ω3 fatty acids). The brain of all mammals maintained a high UI with similar levels of polyunsaturated fatty acids, especially 22∶6ω3. Our results suggest that in heart, skeletal muscle and kidney cortex the activity of the elongases and desaturases are reduced in large mammals compared to small mammals. The allometric trends in membrane composition may be involved in modifying membrane permeability. It is proposed that the elevated degree of polyunsaturation in the membranes of several tissues from small mammals is related to their higher metabolic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234153
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  • 3
    Electronic Resource
    Electronic Resource
    Plasticity of the properties of mitochondria from rainbow trout red muscle with seasonal acclimatization (1997)
    Springer
    Fish physiology and biochemistry 16 (1997), S. 531-541 
    Details
    ISSN: 1573-5168
    Keywords: mitochondria ; muscle ; thermal acclimatization ; fish ; substrate preferences ; phospholipid fatty acid composition ; oxidative capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cold-acclimation of rainbow trout brings only limited changes in muscle metabolic capacities, but marked modifications in membrane composition. Thus, we examined whether the functional properties of mitochondria from trout red muscle were modified by seasonal temperature acclimatization. Mitochondria from fall-acclimatized trout had higher maximal capacities (state 3 rates) for the oxidation of pyruvate and acyl carnitines at 12 and 20 °C than mitochondria isolated from summer-acclimatized trout. For these substrates, the increased oxidative capacity completely compensated for the seasonal drop in temperature. Pyruvate and palmitoyl carnitine were consistently the preferred substrates, while decanoyl and octanoyl carnitine were oxidized at higher rates than glutamine, particularly in fall trout. State 4 rates of oxygen uptake (obtained when all ADP has been converted to ATP) differed less among substrates, but varied seasonally. State 4 rates at 12 and 20 °C were higher in mitochondria isolated from fall than summer trout. At low temperatures, the Q10 of both maximal and state 4 rates of substrate oxidation tended to be higher for mitochondria from fall trout. The apparent Arrhenius activation energy (Ea) for mitochondrial pyruvate oxidation was higher in fall than summer trout whereas the Ea’s for palmitoyl carnitine and decanoyl carnitine oxidation did not change. The fatty acids of mitochondrial phospholipids from fall trout were more polyunsaturated than those from summer trout, with 12% more double bonds occurring than in summer trout, suggesting that membrane restructuring may be involved in the observed compensatory responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007708826437
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  • 4
    Electronic Resource
    Electronic Resource
    Temporal changes in tissue metabolic capacities of wild Atlantic cod Gadus morhua (L.), from Newfoundland (1999)
    Springer
    Fish physiology and biochemistry 20 (1999), S. 181-191 
    Details
    ISSN: 1573-5168
    Keywords: fish ; white muscle ; aerobic metabolism ; anaerobic metabolism ; growth rate ; seasons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We used biochemical indicators to assess the physiological status of Atlantic cod (Gadus morhua) sampled at different sites and times along the Newfoundland coast. The physiological status of cod changed more with time of sampling and size of the cod than with the site of sampling. The levels of muscle glycolytic enzymes and proteins suggest that cod from both near shore and offshore environments experienced the most favorable conditions in late summer and early fall. In small cod sampled near shore, increases in muscle aerobic capacity and protein contents accompanied the decrease in temperature from September to December. The positive allometry of muscle glycolytic capacities was more apparent in samples obtained in early winter than at other times, suggesting that the energetic status of cod affects the expression of this allometric relationship. On the other hand, a negative allometry of muscle aerobic capacities was apparent throughout the study. Reproductive maturity had few effects upon the biochemical parameters measured and tended to favor mature over immature cod. Our results suggest that cod in these areas were only growing in fall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007747600759
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