1-20 of 43
Keywords: urea
Close
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Articles
J Exp Biol (2019) 222 (7): jeb195644.
Published: 09 April 2019
... mammalian sodium/glucose cotransporter 1 ( SGLT1 ) – SGLT1-like – from the ctenidium of the fluted giant clam, Tridacna squamosa . SGLT1-like had a host origin and was expressed predominantly in the ctenidium. Molecular characterizations reveal that SGLT1-like of T. squamosa could transport urea, in...
Journal Articles
J Exp Biol (2019) 222 (3): jeb194787.
Published: 01 February 2019
...Chris M. Wood; Hon Jung Liew; Gudrun De Boeck; J. Lisa Hoogenboom; W. Gary Anderson ABSTRACT Ureotelic elasmobranchs require nitrogen for both protein growth and urea-based osmoregulation, and therefore are probably nitrogen-limited in nature. Mechanisms exist for retaining and/or scavenging...
Journal Articles
J Exp Biol (2018) 221 (2): jeb169342.
Published: 29 January 2018
...-phosphate, GABA, sugars and polyols). Under HD, signs of oxidative stress were noted but not confirmed at the transcriptional level. Finally, urea, a common metabolic waste, was found to accumulate substantially in food from MD and HD larvae. When supplemented in food, urea stimulated cold tolerance but...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (20): 3218–3226.
Published: 15 October 2016
...Chris M. Wood; Marina Giacomin ABSTRACT Nitrogen (N) appears to be a limiting dietary resource for elasmobranchs, required not only for protein growth but also for urea-based osmoregulation. Building on recent evidence that the toxicant ammonia can be taken up actively at the gills of the shark and...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (13): 2028–2038.
Published: 01 July 2016
.... Metabolic rate decreased 20–35% in both species, and gill Na + /K + -ATPase activity was maintained in gummy sharks but decreased 37% in school sharks. We measured plasma ions (Na + , K + , Cl − ) and osmolytes [urea and trimethylamine oxide (TMAO)], and observed a 33% increase in plasma Na + in gummy...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (2): 238–248.
Published: 15 January 2015
... ancient group. We cloned Rh cDNAs ( Rhag, Rhbg and Rhp2 ) and evaluated gill ammonia handling in Squalus acanthias . Control ammonia excretion was <5% of urea-N excretion. Sharks exposed to high environmental ammonia (HEA; 1 mmol −1 NH 4 HCO 3 ) for 48 h exhibited active ammonia uptake against partial...
Journal Articles
J Exp Biol (2013) 216 (15): 2821–2832.
Published: 01 August 2013
... the intestinal tissue of the plainfin midshipman ( Porichthys notatus ) during digestion, resulting in an increase in urea excretion of gastrointestinal origin. Corroborating evidence indicated whole-animal ammonia and urea excretion increased following feeding, and ammonia levels within the lumen of...
Journal Articles
J Exp Biol (2013) 216 (12): 2238–2246.
Published: 15 June 2013
...Jesper Brahm SUMMARY This study extends permeability ( P ) data on chloride, urea and water in red blood cells (RBC), and concludes that the urea transporter (UT-B) does not transport water. P of chick, duck, Amphiuma means , dog and human RBC to 36 Cl − , 14 C-urea and 3 H 2 O was determined under...
Journal Articles
J Exp Biol (2012) 215 (2): 301–313.
Published: 15 January 2012
... toadfish modulate both the expression of Rh isoforms and urea synthesis pathways to tightly control and regulate nitrogen excretion. * Author for correspondence ( trodela@zoology.ubc.ca ) 12 10 2011 © 2012. 2012 nitrogen excretion urea ammonia plasma feeding gill...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (2): 314–323.
Published: 15 January 2012
...Tamara M. Rodela; M. Danielle McDonald; Patrick J. Walsh; Kathleen M. Gilmour SUMMARY In their native environment, gulf toadfish excrete equal quantities of ammonia and urea. However, upon exposure to stressful conditions in the laboratory (i.e. crowding, confinement or air exposure), toadfish...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (24): 4107–4120.
Published: 15 December 2011
... WM by 48 h, and stabilized. Although urea excretion rates ( J Urea ) increased by 2–3-fold during HEA, the increases were insufficient to offset the inhibition of ammonia excretion that occurred, and increases in urea were not observed in the brain or muscle. There was a marked increase in brain...
Journal Articles
J Exp Biol (2011) 214 (22): 3775–3781.
Published: 15 November 2011
... rate were inversely related to energy intake, but they were not related to N intake. By favoring ammonia production over urea, bats on the energy-poor diet may save up to 1% of their basal metabolic rate. Consumption of energy-dilute fruits by fruit bats might affect the way in which N wastes are...
Journal Articles
J Exp Biol (2010) 213 (2): 210–224.
Published: 15 January 2010
... gill – including changes in amino acid and inositol (i.e. osmolyte) metabolism, energy metabolism and proteins related to transcription, translation and protein degradation. Overall, leopard sharks employ a strategy of maintaining plasma urea, ion concentrations and Na + /K + -ATPase activities in the...
Includes: Supplementary data
Journal Articles
J Exp Biol (2009) 212 (23): 3828–3836.
Published: 01 December 2009
...Y. K. Ip; A. M. Loong; B. Ching; G. H. Y. Tham; W. P. Wong; S. F. Chew SUMMARY This study aimed to examine whether the stenohaline freshwater stingray, Potamotrygon motoro , which lacks a functional ornithine—urea cycle, would up-regulate glutamine synthetase (GS) activity and protein abundance...
Journal Articles
J Exp Biol (2009) 212 (15): 2394–2402.
Published: 01 August 2009
...Tammy Laberge; Patrick J. Walsh; M. Danielle McDonald SUMMARY The gulf toadfish ( Opsanus beta ) is a facultatively ureotelic fish that excretes primarily urea under conditions of crowding or confinement. To examine the relationship between ammonia production, urea production and the ornithine–urea...
Journal Articles
J Exp Biol (2008) 211 (15): 2533–2541.
Published: 01 August 2008
... secretion during digestion). Plasma metabolites (glucose, urea and ammonia) were measured at various time points before and after voluntary feeding to satiation (approximately 5% body mass meal of dry commercial pellets), as was the net flux of ammonia and titratable alkalinity to the water from unfed and...
Journal Articles
J Exp Biol (2007) 210 (8): 1335–1349.
Published: 15 April 2007
... in all segments at all times after feeding. Much of the osmotic equilibration was because of the secretion of urea into the chyme,particularly in the intestine. After feeding, gastric fluid concentrations of Na + and Mg 2+ declined, K + and Ca 2+ increased, whereas Cl – exhibited little change...
Journal Articles
J Exp Biol (2006) 209 (24): 4885–4894.
Published: 15 December 2006
... individual free AA concentrations as indicated by variable ratios among the simultaneous blood samples. Furthermore, the elevation of ammonium and urea in the HPV indicates intestinal catabolism of ingested free AA before release into the HPV. In conclusion, the dual HPV and DA cannulation shows promise as a...
Journal Articles
J Exp Biol (2006) 209 (22): 4475–4489.
Published: 15 November 2006
... synthetase I or III activity was detected in its liver. It was ammonotelic in water, and did not detoxify ammonia through increased urea synthesis during the 4 days of emersion. Unlike many air-breathing fishes reported elsewhere, A. testudineus could uniquely excrete ammonia during emersion at a rate...
Journal Articles
J Exp Biol (2006) 209 (21): 4254–4261.
Published: 01 November 2006
...John F. Barimo; Patrick J. Walsh SUMMARY Because urea is bioenergetically expensive to synthesize, few aquatic teleostean (bony) fish make or excrete much urea beyond early development and excrete the majority of nitrogenous waste as the readily diffusible ammonia. The gulf toadfish is one of a few...
Includes: Multimedia, Supplementary data