Concentration and distribution of dissolved amino acids in a shallow hydrothermal system, Vulcano Island (Italy)

Concentrations and distributions of dissolved amino acids in fluids from Mid-Atlantic Ridge hydrothermal vents

“…However, in contrast to the results of Haberstroh and Karl, all samples from this study, even those with fluid proportions over 80%, do contain significant amounts of amino acids (mainly Asp and Glu), in addition to NH 4 + . TDFAAs in water samples (60.7-87.5°C) from the shallow hydrothermal system at Vulcano Island, Italy, have been reported to be in the order of 1.3 and 1.9 µM at two submarine vent sites (Svensson et al, 2004). These levels are however almost an order of magnitude higher than the TDFAA of this study, which is due to several factors, such as contribution to the DFAA pool by additional sources at the shallow hydrothermal vent.…”

“…However, the low pH and high temperature of the hydrothermal fluids might cause in situ acid hydrolysis of dissolved combined amino acids (DCAA), which in return would be a source of DFAA. This has been proposed by Svensson et al (2004), who found elevated DFAA/DCAA ratios in hydrothermal fluids compared to seawater.…”

“…A significant correlation of DOC with AA concentration was found by Svensson et al (2004). The continuous flow through the system would remove the products, preventing their immediate consumption.…”

“…However, it might only be relevant in diffuse hydrothermal fluids or in the mixing zone of hot smoker fluids, where metal concentrations are in the order of magnitude of amino acid concentrations (i.e., nanomolar level). Moreover, organic complexation of metals probably strongly influences transport, sorption Horiuchi et al, 2004;Svensson et al, 2004;Takano et al, 2004a, b). Moreover, the presented data provide the first information about the organic chemistry of the hydrothermal fluids systems of Logatchev and 4°-9°S on the Mid-Atlantic Ridge (MAR), for which geology, inorganic geochemistry and microbiology have been investigated in detail during the German special priority program SPP 1144 "From the mantle to the oceans: energy-, material-, and life-cycles at spreading axes".…”

Renewable energy-driven desalination technologies: A comprehensive review on challenges and potential applications of integrated systems

“…at 350° average velocity of 0.15 m/s at 21°N on the East Pacific Rise [102], at 400°C [103][104][105]; at 464°C at the Mid-Atlantic Ridge [106]), and (ii) coastal resources found at depths between 1 and 50 m. Both types of resources have been described in the scientific literature from all over the world; however this research did not target their use as energy resources (e.g., [107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122] [97,124]. Some rough estimates indicate that the full exploitation of the thermal potential of the entire volcanic district of the South Tyrrhenian Sea, could satisfy 7-10% of the actual Italian electricity demand [97,124].…”