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Quantitative analysis of amino acid excretion by Methanothermobacter marburgensis under N-fixing conditions.
Sci Rep
January 2025
Archaea Physiology & Biotechnology Group, Department of Functional and Evolutionary Ecology, University of Vienna, Wien, Austria.
Methanogenic archaea (methanogens) possess fascinating metabolic characteristics, such as the ability to fix molecular nitrogen (N). Methanogens are of biotechnological importance due to the ability to produce methane (CH) from molecular hydrogen (H) and carbon dioxide (CO) and to excrete proteinogenic amino acids. This study focuses on analyzing the link between biological methanogenesis and amino acid excretion under N-fixing conditions.
View Article and Find Full Text PDFRenal Tubular Acidosis: Core Curriculum 2025.
Am J Kidney Dis
January 2025
Division of Nephrology and Hypertension, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
Renal tubular acidoses (RTAs) are a subset of non-anion gap metabolic acidoses that result from complex disturbances in renal acid excretion. Net acid excretion is primarily accomplished through the reclamation of sodium bicarbonate and the buffering of secreted protons with ammonia or dibasic phosphate, all of which require a series of highly complex and coordinated processes along the renal tubule. Flaws in any of these components lead to the development of metabolic acidosis and/or a failure to compensate fully for other systemic acidoses.
View Article and Find Full Text PDFAccounting for the role of the gastro-intestinal tract in the ammonia and urea-N dynamics of freshwater rainbow trout on long-term satiation feeding.
J Exp Biol
January 2025
Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
The contribution of the gut to the ingestion, production, absorption, and excretion of the extra ammonia and urea-N associated with feeding ("exogenous" fraction) has received limited prior attention. Analysis of commercial pellet food revealed appreciable concentrations of ammonia and urea-N. Long term satiation-feeding increased whole trout ammonia and urea-N excretion rates by 2.
View Article and Find Full Text PDFExploring the impact of magnetic fields related to submarine power cables on the American mud crab Rhithropanopeus harrisii: A behavioural and physiological perspective.
Mar Pollut Bull
December 2024
Department of Physics, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland.
The number of submarine cables in marine environment is increasing. Thus, marine organisms, especially benthic invertebrates are exposed to magnetic fields generated by those cables. The aim of the study was to determine the effect of static magnetic field (SMF) and electromagnetic field (EMF) on the behaviour and physiology of Rhithropanopeus harrisii during a series of laboratory experiments.
View Article and Find Full Text PDFIs the air-breathing organ a significant route for CO excretion during aquatic hypercapnia in the pirarucu, Arapaima gigas?
J Comp Physiol B
December 2024
Laboratory of Ecophysiology and Molecular Evolution, Brazilian National Institute for Research of the Amazon (INPA), Manaus, Brazil.
The pirarucu is one of the very few obligate air-breathing fish, employing a gigantic, highly vascularized air-breathing organ (ABO). Traditionally, the ABO is thought to serve mainly for O uptake (ṀO), with the gills providing the major route for excretion of CO (ṀCO) and N-waste. However, under aquatic hypercapnia, a common occurrence in its natural environment, branchial ṀCO to the water may become impaired.
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