Regulation of seasonal changes in circulating thyroid hormones in channel catfish /
activity.
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1998.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | activity. activity. Hepatic ORD Vmax and Km, were highest in and seasonal alterations in plasma binding proteins April, possibly a response to elevated reproductive catfish hepatic 011.13 was chemically similar to changes in the phase of daily rhythms in circulating Channel catfish, Ictalurus punctatus, were sampled at hics. Circulating T3 levels may thus be more directly circulating thyroid hormones were due to seasonal circulating Ts in July may inhibit ORD activity. coincident with highest blood protein levels. dependent on the centrally regulated provision of T4 evidence for seasonal phase shifting in diurnal Except for plasma T3 levels in April, the pattern of hepatic deionization and blood protein binding. Plasma hepatic deionization, I developed an assay to measure hepatic outer ring deiodinase (011.I)). Channel in January, intermediate in April and highest in July. January whereas To binding was highest in July, Lastly, T4 binding by the plasma was highest in levels, or to seasonal alterations in peripheral mammalian Type 11 and fish denominates. Hepatic [] minimal and maximal food intake, respectively. The morning, midday, and dusk in January, April, and July not to be due to an elevation in hepatic 011.13 retained throughout all three months providing no significantly lower thyroid hormone concentrations in steroids or increased food consumption, whereas high summer increase in circulating Ta therefore appears than on peripheral regulation of hepatic deiodinase the morning which peaked later in the photophase was thyroid hormone cycles. To examine seasonal changes in thyroxine (T4) and triiodothyronine (T3) were lowest to determine if apparent seasonal differences in were identical in January and July, at times of |
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| Item Description: | "Major subject: Zoology". Vita. |
| Physical Description: | viii, 63 leaves : illustrations ; 28 cm. Also available online. |
| Bibliography: | Includes bibliographical references (leaves 56-62). |