EFFECTS OF CONFINEMENT/CROWDING ON UREOGENESIS IN THE GULF TOADFISH OPSANUS BETA
نویسندگان
چکیده
منابع مشابه
Effects of Confinement/crowding on Ureogenesis in the Gulf Toadfish Opsanus Beta
In order to elucidate the cues for, and the biochemical mechanisms of, the transition to ureogenesis in the gulf toadfish Opsanus beta, experiments on the effects of confinement/crowding were carried out. Confinement of toadfish to small volumes of water initiated a switch to nearly complete reliance on ureogenesis for nitrogen excretion within 24­48 h. Further experiments suggested that th...
متن کاملAcoustic competition in the gulf toadfish Opsanus beta: acoustic tagging.
Nesting male gulf toadfish Opsanus beta produce a boatwhistle advertisement call used in male-male competition and to attract females and an agonistic grunt call. The grunt is a short-duration pulsatile call, and the boatwhistle is a complex call typically consisting of zero to three introductory grunts, a long tonal boop note, and zero to three shorter boops. The beginning of the boop note is ...
متن کاملEffects of feeding and confinement on nitrogen metabolism and excretion in the gulf toadfish Opsanus beta
In order to elucidate further the cues for, and the biochemical mechanisms of, the transition to ureogenesis in the gulf toadfish Opsanus beta, experiments on the effects of feeding (i.e. nitrogen loading) were carried out. Baseline nitrogen excretion rates were first measured on solitary toadfish in large water volumes (i.e. unconfined conditions). These nitrogen excretion rates were higher, a...
متن کاملComparison of the Effects of Ammonia on Brain Mitochondrial Function in Rats and Gulf Toadfish (Opsanus beta)
We compared the effect of hyperammonemia on NADH levels in brain slices, and on the rate of oxygen consumption from isolated non-synaptic brain mitochondria, in ammoniasensitive Wistar rats with that in ammonia-tolerant gulf toadfish (Opsanus beta). The NADH content was significantly decreased (12% less than control after 45 min with 1 mM NH4Cl) in rat brain slices, but it was not affected in b...
متن کاملMolecular characterization of a urea transporter in the gill of the gulf toadfish (Opsanus beta).
Urea excretion by the gulf toadfish (Opsanus beta) has been shown in previous studies to be a highly pulsatile facilitated transport, with excretion probably occurring at the gill. The present study reports the isolation of an 1800 base pair (kb) cDNA from toadfish gill with one open reading frame putatively encoding a 475-residue protein, the toadfish urea transporter (tUT). tUT, the first tel...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1994
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.191.1.195