mitochondria
- Early feeding of rainbow trout (Oncorhynchus mykiss) with methionine-deficient diet over a 2 week period: consequences for liver mitochondria in juveniles
Summary: A potential role for methionine in the application of new feeding strategies, such as nutritional programming, to optimize the nutrition and health of farmed fish.
- Mitochondrial genotype influences the response to cold stress in the European green crab, Carcinus maenas
Summary: Different mitochondrial haplotypes of Carcinus maenas in the Gulf of Maine, derived from multiple biological introductions, have a strong, male-specific effect on whether invasive crabs can right themselves under cold stress, while two candidate nuclear loci have no such effect.
- Turtles maintain mitochondrial integrity but reduce mitochondrial respiratory capacity in the heart after cold acclimation and anoxia
Summary: Inhibition of mitochondrial respiration rate and production of reactive oxygen species during cold acclimation and anoxia, while preserving mitochondrial content and morphology, is central to the anoxia tolerance of freshwater turtle hearts.
- Mitochondrial plasticity in the cerebellum of two anoxia-tolerant sharks: contrasting responses to anoxia/re-oxygenation
Highlighted Article: The brain mitochondria of reef sharks reveal some adaptations that parallel their contrasted physiological strategies to cope with environmental oxygen deprivation.
- Interspecific variation in brain mitochondrial complex I and II capacity and ROS emission in marine sculpins
Summary: We show relationships between hypoxia tolerance and mitochondrial complex I and II flux capacities in marine sculpins that were not directly related to variation in ROS emission.
- Subspecies differences in thermal acclimation of mitochondrial function and the role of uncoupling proteins in killifish
Summary: Changes in mitochondrial capacity, proton leak, uncoupling protein expression and fatty-acid-induced uncoupling with cold acclimation are greater in a putatively cold-adapted northern population of killifish compared with a southern population.
- Scaling of morphology and ultrastructure of hearts among wild African antelope
Summary: Wild African antelope show proportionality between capillary and mitochondrial investments of the heart, indicating economy of design at the cellular level of the oxygen cascade in an aerobic organ.
- Cardiac mitochondrial metabolism may contribute to differences in thermal tolerance of red- and white-blooded Antarctic notothenioid fishes
Summary: Hearts of icefishes have a lower capacity to maintain ATP levels through aerobic metabolic pathways compared with those of red-blooded species, which may constrain cardiac performance and lower thermal tolerance.
- Suppression of reactive oxygen species generation in heart mitochondria from anoxic turtles: the role of complex I S-nitrosation
Summary: Heart mitochondria show suppressed reactive oxygen species (ROS) generation when isolated from anoxic turtles. Surprisingly, complex I S-nitrosation, a potent modification inhibiting ROS production, is not involved in this response.
- The membrane pacemaker hypothesis: novel tests during the ontogeny of endothermy
Summary: The authors examine how tissue lipid composition changes during development, and how dietary lipid manipulation affects basal and peak metabolic rate, providing mixed support for the membrane pacemaker hypothesis.