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Keywords: ammonia
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Journal Articles
J Exp Biol (2019) 222 (3): jeb194787.
Published: 1 February 2019
... nitrogen in the gills, kidney, rectal gland and gut, but as yet, the latter are not well characterized. Intestinal sac preparations of the Pacific spiny dogfish shark ( Squalus acanthias suckleyi ) incubated in vitro strongly reabsorbed urea from the lumen after feeding, but mucosal fluid ammonia...
Journal Articles
J Exp Biol (2018) 221 (19): jeb185553.
Published: 5 October 2018
... oxygen consumption and ammonia excretion rates in the two compartments and found that, at rest, squid only obtain enough oxygen cutaneously to meet the demand of the skin tissue locally (12% of total) and excrete little ammonia across the skin. The majority of oxygen is obtained via the traditional...
Journal Articles
J Exp Biol (2018) 221 (8): jeb176313.
Published: 19 April 2018
... , expresses a urea active transporter, DUR3-like, in its ctenidium which may participate in light-enhanced urea absorption. Amino acid Ammonia Calcification Nitrogen Symbiodinium Zooxanthellae Tropical waters are often referred to as ‘deserts’, characterized by poor nutrient content due...
Journal Articles
J Exp Biol (2016) 219 (18): 2814–2818.
Published: 15 September 2016
...Alexander M. Clifford; Alex M. Zimmer; Chris M. Wood; Greg G. Goss ABSTRACT Hagfish skin has been reported as an important site for ammonia excretion and as the major site of systemic oxygen acquisition. However, whether cutaneous O 2 uptake is the dominant route of uptake remains under debate; all...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (6): 887–896.
Published: 15 March 2016
...Sandra Fehsenfeld; Dirk Weihrauch ABSTRACT Numerous electrophysiological studies on branchial K + transport in brachyuran crabs have established an important role for potassium channels in osmoregulatory ion uptake and ammonia excretion in the gill epithelium of decapod crustaceans. However, hardly...
Journal Articles
J Exp Biol (2013) 216 (21): 4025–4037.
Published: 1 November 2013
...Li Zhang; C. Michele Nawata; Chris M. Wood SUMMARY Ammonia has been documented as a respiratory gas that stimulates ventilation, and is sensed by peripheral neuroepithelial cells (NECs) in the gills in ammoniotelic rainbow trout. However, the hyperventilatory response is abolished in trout...
Journal Articles
J Exp Biol (2013) 216 (15): 2821–2832.
Published: 1 August 2013
...Carol Bucking; Christophe M. R. LeMoine; Paul M. Craig; Patrick J. Walsh SUMMARY Digestion affects nitrogen metabolism in fish, as both exogenous and endogenous proteins and amino acids are catabolized, liberating ammonia in the process. Here we present a model of local detoxification of ammonia...
Journal Articles
J Exp Biol (2012) 215 (21): 3723–3733.
Published: 1 November 2012
... ( dbsipyk@nus.edu.sg ) 1 12 2011 6 8 2012 © 2012. 2012 ammonia buccopharyngeal respiration buccopharyngeal villiform processes nitrogen metabolism urea excretion urea transporter UT-A The Chinese soft-shelled turtle, Pelodiscus sinensis Wiegmann 1835, previously known...
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 (2012) 215 (2): 301–313.
Published: 15 January 2012
... the movement of NH 3 across cell membranes. This study examines the effects of crowding and feeding on ammonia excretion in gulf toadfish ( Opsanus beta ) within the context of Rh glycoproteins and the ammonia-fixing enzyme, glutamine synthetase (GS). Four Rh isoforms (Rhag, Rhbg, Rhcg1 and Rhcg2) were...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (23): 4048–4054.
Published: 1 December 2011
...Quanxi Zhang; Ziqiang Meng SUMMARY Ammonia (NH 3 ) is a common exogenous gas in the atmosphere, as well as an endogenous chemical produced by amino acid catabolism and other pathways in vivo . Physiological and pathophysiological roles of NH 3 in the nervous system have been studied. Recently...
Journal Articles
J Exp Biol (2011) 214 (22): 3775–3781.
Published: 15 November 2011
...L. Gerardo Herrera M.; Jazmín Osorio M.; Carlos A. Mancina G. SUMMARY We tested the role of increased ammonia in urine as an energy- and/or nitrogen (N)-saving mechanism in the great fruit-eating bat Artibeus lituratus (Phyllostomidae). We compared N excretion in two groups of bats fed energy-rich...
Journal Articles
J Exp Biol (2011) 214 (16): 2678–2689.
Published: 15 August 2011
...Li Zhang; Colin A. Nurse; Michael G. Jonz; Chris M. Wood SUMMARY Ammonia, the third respiratory gas in teleost fish, acts as an acute stimulant to ventilation in ammoniotelic rainbow trout. We investigated whether this sensitivity is maintained in trout chronically exposed (1+ months) to high...
Journal Articles
J Exp Biol (2009) 212 (15): 2394–2402.
Published: 1 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 (2009) 212 (9): 1248–1258.
Published: 1 May 2009
... in the expression of GS mRNA could have occurred. * Author for correspondence (e-mail: dbsipyk@nus.edu.sg ) 9 2 2009 2009 ammonia glutamine glutamine synthetase Monopterus albus nitrogen metabolism osmoregulation swamp eel References Anderson, P. M. and Little, R. M...
Journal Articles
J Exp Biol (2009) 212 (8): 1202–1211.
Published: 15 April 2009
... diffusion urea transporter ammonia terrestrialization skin Reverse-transcription (RT-) PCR was used to determine the mRNA expression pattern of lfUT in various tissues of fasted control and post-terrestrialized lungfish. Three lungfish were used per group. On day 34, terrestrialized...
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: 1 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
Journal Articles
J Exp Biol (2006) 209 (7): 1179–1184.
Published: 1 April 2006
...D. J. Randall; T. K. N. Tsui SUMMARY The gills are the major site of acid–base regulation in most fish. Acid–base transfer across fish gills is dominated by carbon dioxide and ammonia excretion, especially the former. Bicarbonate buffering in the blood is less than that found in mammals; regulation...
Journal Articles
J Exp Biol (2006) 209 (3): 484–492.
Published: 1 February 2006
... intake. However, there were significant reductions in daily rates of ammonia and urea excretion in H. signifer during salinity changes, especially between day 5 (in 10‰water) and day 10 (in 15‰ water) when compared to those of the control kept in 1‰ water. Consequently, there was a significant decrease...