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Chew SF, Tan SZL, Ip SCY, Pang CZ, Hiong KC, Ip YK. The Non-ureogenic Stinging Catfish, Heteropneustes fossilis, Actively Excretes Ammonia With the Help of Na +/K +-ATPase When Exposed to Environmental Ammonia. Front Physiol 2020; 10:1615. [PMID: 32038295 PMCID: PMC6987325 DOI: 10.3389/fphys.2019.01615] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 12/23/2019] [Indexed: 11/25/2022] Open
Abstract
The stinging catfish, Heteropneustes fossilis, can tolerate high concentrations of environmental ammonia. Previously, it was regarded as ureogenic, having a functional ornithine-urea cycle (OUC) that could be up-regulated during ammonia-loading. However, contradictory results indicated that increased urea synthesis and switching to ureotelism could not explain its high ammonia tolerance. Hence, we re-examined the effects of exposure to 30 mmol l–1 NH4Cl on its ammonia and urea excretion rates, and its tissue ammonia and urea concentrations. Our results confirmed that H. fossilis did not increase urea excretion or accumulation during 6 days of ammonia exposure, and lacked detectable carbamoyl phosphate synthetase I or III activity in its liver. However, we discovered that it could actively excrete ammonia during exposure to 8 mmol l–1 NH4Cl. As active ammonia excretion is known to involve Na+/K+-ATPase (Nka) indirectly in several ammonia-tolerant fishes, we also cloned various nkaα-subunit isoforms from the gills of H. fossilis, and determined the effects of ammonia exposure on their branchial transcripts levels and protein abundances. Results obtained revealed the presence of five nkaα-subunit isoforms, with nkaα1b having the highest transcript level. Exposure to 30 mmol l–1 NH4Cl led to significant increases in the transcript levels of nkaα1b (on day 6) and nkaα1c1 (on day 1 and 3) as compared with the control. In addition, the protein abundances of Nkaα1c1, Nkaα1c2, and total NKAα increased significantly on day 6. Therefore, the high environmental ammonia tolerance of H. fossilis is attributable partly to its ability to actively excrete ammonia with the aid of Nka.
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Affiliation(s)
- Shit F Chew
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, Singapore
| | - Stephanie Z L Tan
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Sabrina C Y Ip
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, Singapore
| | - Caryn Z Pang
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, Singapore
| | - Kum C Hiong
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Yuen K Ip
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
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Tay ASL, Chew SF, Ip YK. The swamp eel Monopterus albus reduces endogenous ammonia production and detoxifies ammonia to glutamine during 144 h of aerial exposure. J Exp Biol 2003; 206:2473-86. [PMID: 12796462 DOI: 10.1242/jeb.00464] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The swamp eel Monopterus albus inhabits muddy ponds, swamps, canals and rice fields, where it can burrow within the moist earth during the dry summer season, thus surviving for long periods without water. This study aimed to elucidate the strategies adopted by M. albus to defend against endogenous ammonia toxicity when kept out of water for 144 h (6 days). Like any other fish, M. albus has difficulties in excreting ammonia during aerial exposure. In fact, the rates of ammonia and urea excretions decreased significantly in specimens throughout the 144 h of aerial exposure. At 144 h, the ammonia and urea excretion rates decreased to 20% and 25%, respectively, of the corresponding control values. Consequently, ammonia accumulated to high levels in the tissues and plasma of the experimental specimens. Apparently, M. albus has developed relatively higher ammonia tolerance at the cellular and subcellular levels compared with many other teleost fish. Since the urea concentration in the tissues of specimens exposed to air remained low, urea synthesis was apparently not adopted as a strategy to detoxify endogenous ammonia during 144 h of aerial exposure. Instead, ammonia produced through amino acid catabolism was detoxified to glutamine, leading to the accumulation of glutamine in the body during the first 72 h of aerial exposure. Complementing the increased glutamine formation was a significant increase in glutamine synthetase activity in the liver of specimens exposed to air for 144 h. Formation of glutamine is energetically expensive. It is probably because M. albus remained relatively inactive on land that the reduction in energy demand for locomotory activity facilitated its exploitation of glutamine formation to detoxify endogenous ammonia. There was a slight decrease in the glutamine level in the body of the experimental animals between 72 h and 144 h of aerial exposure, which indicates that glutamine might not be the end product of nitrogen metabolism. In addition, these results suggest that suppression of endogenous ammonia production, possibly through reductions in proteolysis and amino acid catabolism, acts as the major strategy to avoid ammonia intoxication in specimens exposed to air for >/=72 h. It is concluded that glutamine formation and reduction in ammonia production together served as effective strategies to avoid the excessive accumulation of ammonia in the body of M. albus during 144 h of aerial exposure. However, these strategies might not be adequate to sustain the survival of M. albus in the mud for longer periods during drought because ammonia and glutamine concentrations had already built up to high levels in the body of specimens exposed to air for 144 h.
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Affiliation(s)
- Angeline S L Tay
- Department of Biological Science, National University of Singapore, Kent Ridge, Singapore 117543, Republic of Singapore
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MAETZ J, GARCIAROMEU F. THE MECHANISM OF SODIUM AND CHLORIDE UPTAKE BY THE GILLS OF A FRESH-WATER FISH, CARASSIUS AURATUS. II. EVIDENCE FOR NH4 ION/NA ION AND HCO3 ION/C1 ION EXCHANGES. ACTA ACUST UNITED AC 1996; 47:1209-27. [PMID: 14193849 PMCID: PMC2195381 DOI: 10.1085/jgp.47.6.1209] [Citation(s) in RCA: 244] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The addition of ammonium ions to the external medium results in an inhibition of the sodium influx and net uptake in Carassius auratus, while intraperitoneal injection of ammonium produces the opposite effect. The simultaneous chloride balance is not significantly affected by these treatments. The addition of bicarbonate ions to the external medium results in a reduction of the influx and net flux of chloride, while injection of bicarbonate produces the opposite effect. The simultaneous sodium balance is not significantly altered. The effects of the external additions are reversible after elimination of the excess ammonium or bicarbonate ions by rinsing. Inhibition of carbonic anhydrase in the gill by injection of acetazoleamide produces a simultaneous inhibition of both sodium and chloride exchanges. These results confirm the hypothesis of an exchange of sodium for ammonium, and of bicarbonate for chloride across the gill. A tentative schematic representation of the ionic absorption mechanisms in the branchial cell of the fresh-water teleosts is given. Similarities with other biological membranes and especially with the renal tubule are pointed out.
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Induction of ornithine-urea cycle in a freshwater teleost, Heteropneustes fossilis, exposed to high concentrations of ammonium chloride. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0305-0491(94)90083-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Saha N, Ratha BK. Comparative study of ureogenesis in freshwater, air-breathing teleosts. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/jez.1402520102] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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du Preez HH, Cockroft AC. Nonfaecal and faecal losses of the marine teleost, Lichia amia (Linnaeus, 1758), feeding on live southern mullet, Liza richardsonii (Smith, 1846). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. A, COMPARATIVE PHYSIOLOGY 1988; 90:71-7. [PMID: 2900110 DOI: 10.1016/0300-9629(88)91007-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
1. Nonfaecal and faecal losses of Lichia amia were determined under controlled laboratory conditions at 15, 20 and 25 degrees C. 2. Ammonia-N was the major form of nonfaceal nitrogen excreted by L. amia and excretion rates were temperature-dependent. 3. The mass component b of the mass/ammonia-N excretion equation was temperature-independent and ranged from 0.63-0.65 and from 0.66-0.73 for starved and fed fish, respectively. 4. Mean nonfaecal energy loss (exogenous plus endogenous) was 3.78 +/- 1.99% of the ingested energy. 5. Assimilation efficiencies varied between individual fish and ranged from 61.24-93.79% (mean 80.76 +/- 7.14%) for dry matter and 87.52-98.22% (mean 94.09 +/- 2.22%) for energy. 6. The mean nonfaecal and faecal energy loss was 23.11 +/- 1.67% of the ingested energy.
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Affiliation(s)
- H H du Preez
- Department of Zoology, University of Port Elizabeth, South Africa
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Randall DJ, Wright PA. Ammonia distribution and excretion in fish. FISH PHYSIOLOGY AND BIOCHEMISTRY 1987; 3:107-120. [PMID: 24233438 DOI: 10.1007/bf02180412] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This paper reviews the literature concerning ammonia production, storage and excretion in fish. Ammonia is the end product of protein catabolism and is stored in the body of fish in high concentrations relative to basal excretion rates. Ammonia, if allowed to accumulate, is toxic and is converted to less toxic compounds or excreted. Like other weak acids and bases, ammonia is distributed between tissue compartments in relation to transmembrane pH gradients. NH3 is generally equilibrated between compartments but NH4 (+) is distributed according to pH. Ammonia is eliminated from the blood upon passage through the gills. The mechanisms of branchial ammonia excretion vary between different species of fish and different environments, and primarily involves NH3 passive diffusion and NH4 (+)/Na(+) exchange. Water chemistry near the gill surface may also be important to ammonia excretion, but a more accurate measurement of the NH3 gradient across the gill epithelium is required before a more detailed analysis of NH3 and NH4 (+) excretion can be made.
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Affiliation(s)
- D J Randall
- Department of Zoology, University of British Columbia, Vancouver, B.C., V6T 2A9
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Orbán L, Tátrai I. The effect of various ambient ammonia concentrations on the nitrogen metabolism of carp fry (Cyprinus carpio L.). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. A, COMPARATIVE PHYSIOLOGY 1987; 86:449-52. [PMID: 2881685 DOI: 10.1016/0300-9629(87)90523-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Authors studied how 125, 375 and 625 micrograms/l amounts of NH4Cl added to the water influenced the ammonia excretion of carp fry with an average weight of 2.4 g, compared to the control. During the course of the experiments the NH4N concentration, the pH and the temperature were measured for three days, twice daily. On the basis of our results the threshold concentration exerting harmful effects on the ammonia household of carp fry (disturbing the normal rate of metabolism in the fishes and decreasing their growth rate) is between 125 and 375 micrograms/l. NH4H (50-100 micrograms/l NH3). The ammonia concentrations exceeding 375 micrograms/l NH4+ (and 100 micrograms/l NH3, respectively) can be regarded as undesirable and harmful in frybreeding fish ponds. With regard to the ambient ammonia, a daily cycle developed in the excretion of ammonia: contrary to the control, a minimum in ammonia excretion was measured in the morning, while a maximum was measured in the afternoon.
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Alexis MN, Papaparaskeva-Papoutsoglou E. Aminotransferase activity in the liver and white muscle of Mugil capito fed diets containing different levels of protein and carbohydrate. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1986; 83:245-9. [PMID: 3943311 DOI: 10.1016/0305-0491(86)90361-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Four groups of Mugil capito were fed diets with protein and carbohydrate contents changing reciprocally for 121 days. Food consumption changed proportionally to the carbohydrate content of the diet, while final fish growth was similar for all groups of fish. Liver transaminase levels changed significantly with the protein content of the diet. The changes in body transaminase levels were lower in magnitude. The results obtained are compared to those obtained from other fish species and possible reasons for the differences observed are discussed.
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Effects of lysine administration on plasma arginine and on some nitrogenous catabolites in rainbow trout. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0300-9629(84)90546-2] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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The effect of feeding and starving, and different ratios of protein energy to total energy in the feed on the excretion of ammonia in atlantic cod (Gadus morhua). ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0300-9629(84)90090-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Van Waarde A. Aerobic and anaerobic ammonia production by fish. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1983; 74:675-84. [PMID: 6345084 DOI: 10.1016/0305-0491(83)90127-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
1. In comparison to other vertebrates, a relatively large part of energy consumption in fish is covered by protein catabolism. 2. In Teleosts, ammonia is the major component of nitrogen excretion, its production rate being directly related to the rate of protein oxidation, while urea is almost exclusively produced from nucleotides by uricolysis. 3. Aerobic ammonia excretion arises from extraction of blood ammonia by the gill. 4. Under aerobic conditions, ammonia originates mainly in the liver by transdeamination and the hydrolysis of imino groups, while an additional quantity is formed in working skeletal muscles by purine nucleotide cycling. 5. During a decline of environmental oxygen, the contribution of the liver to total ammonia production seems to be lowered, while that of skeletal muscles is increased. 6. Anaerobic ammoniogenesis seems to proceed via at least 4 different mechanisms, all occurring in goldfish: deamination of adenylates via adenylate deaminase, deamination of aspartate via the purine nucleotide cycle, breakdown of alanine to ethanol, CO2 and NH3, and oxidation of glutamate via a slowly spinning Krebs-cycle. 7. In goldfish, the combination of these mechanisms is able to sustain an anaerobic rate of ammoniogenesis being equal to that observed under normoxic conditions.
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Van Waarde A, De Wilde-Van Berge Henegouwen M. Nitrogen metabolism in goldfish, Carassius auratus (L.). Pathway of aerobic and anaerobic glutamate oxidation in goldfish liver and muscle mitochondria. ACTA ACUST UNITED AC 1982. [DOI: 10.1016/0305-0491(82)90021-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Diurnal pattern of the ammonia and urea excretion of feeding and starved bream, Abramis brama L. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0300-9629(81)91447-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Nitrogen metabolism in goldfish, Carassius auratus (L.). Influence of added substrates and enzyme inhibitors on ammonia production of isolated hepatocytes. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0305-0491(81)90288-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Leray C, Raffin JP, Winninger C. Aspects of purine metabolism in the gill epithelium of rainbow trout, Salmo gairdneri Richardson. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1979; 62:31-40. [PMID: 318437 DOI: 10.1016/0305-0491(79)90007-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
1. Enzymes interconnecting the adenylate pool were present in high concentration. 2. AMP and adenosine were easily deaminated by the corresponding enzymes whose high levels were detected. 3. Adenylate was hydrolyzed either by deamination to yield IMP which was further dephosphorylated to inosine or by dephosphorylation to adenosine followed by deamination to inosine. 4. Incubation of gill extract with [-14C]-AMP in the presence and absence of ATP but with adenosine deaminase inhibitors allowed demonstration that ATP controlled the balance between these pathways. 5. Some biochemical properties of 5'-nucleotidase. AMP deaminase and adenosine deaminase were defined. 6. Purine salvage enzymes were also estimated.
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Affiliation(s)
- C Leray
- Laboratoire de Physiologie comparée des Régulations, C.N.R.S., B.P. 20 C.R., 67037 Strasbourg-Cédex, France
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Payan P, Matty AJ. The characteristics of ammonia excretion by a perfused isolated head of trout (Salmo gairdneri): Effect of temperature and CO2-free ringer. ACTA ACUST UNITED AC 1975. [DOI: 10.1007/bf00706596] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Janicki R, Lingis J. Mechanism of ammonia production from aspartate in teleost liver. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1970; 37:101-5. [PMID: 5484071 DOI: 10.1016/0010-406x(70)90962-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Umminger BL. Physiological studies on supercooled killifish (Fundulus heteroclitus) II. Serum organic constituents and the problem of supercooling. ACTA ACUST UNITED AC 1969. [DOI: 10.1002/jez.1401720406] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Unsworth BR, Balinsky JB, Crook EM. Evidence for direct excretion of blood ammonia by an ammoniotelic amphibian. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1969; 31:373-7. [PMID: 5353577 DOI: 10.1016/0010-406x(69)91661-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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de Vooys CG. Formation and excretion of ammonia in Teleostei. II. Occurrence and transort of ammonia in the blood. ARCHIVES INTERNATIONALES DE PHYSIOLOGIE ET DE BIOCHIMIE 1969; 77:112-8. [PMID: 4181683 DOI: 10.3109/13813456909056652] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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de Vooys GG. Formation and excretion of ammonia in Teleostei. I. Excretion of ammonia through the gills. ARCHIVES INTERNATIONALES DE PHYSIOLOGIE ET DE BIOCHIMIE 1968; 76:268-72. [PMID: 4174611 DOI: 10.3109/13813456809058704] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Kenyon AJ. The role of the liver in the maintenance of plasma proteins and amino acids in the eel, Anguilla anguilla L., with reference to amino acid deamination. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1967; 22:169-75. [PMID: 6049985 DOI: 10.1016/0010-406x(67)90178-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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McBean RL, Neppel MJ, Goldstein L. Glutamate dehydrogenase and ammonia production in the eel (Anguilla rostrata). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1966; 18:909-20. [PMID: 5967415 DOI: 10.1016/0010-406x(66)90221-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Pequin L, Serfaty A. [Glutamic acid and nitrogen excretion in the common carp, Cyprinus carpio L]. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1966; 18:141-9. [PMID: 5965107 DOI: 10.1016/0010-406x(66)90338-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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FANELLI GM, GOLDSTEIN L. Ammonia excretion in the neotenous newt, Necturus maculosus (rafinesque). ACTA ACUST UNITED AC 1964; 13:193-204. [PMID: 14227315 DOI: 10.1016/0010-406x(64)90116-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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