Abstract
Abstract Captive dogfish, Mustelus canis , were injected with saline containing 13 C-enriched alanine or glucose and permitted to metabolize labeled substrates. Blood plasma and other body fluids were analyzed using high field 13 C nuclear magnetic resonance (NMR) spectroscopy. Both injected glucose and alanine are converted to lactate with alanine conversion more rapid than that of glucose. 13 C-enriched alanine and lactate appear in intracapsular fluids after injection of 13 C-enriched alanine into the maternal blood vascular system. Studies involving the injection of 13 C-enriched nutrients into the maternal circulation can yield information on metabolite utilization and embryonic nutrition in viviparous matrotrophs.
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