Recent studies suggest that unidentified prokaryotes fix inorganic carbon at globally significant rates in the immense dark ocean. Using single-cell sorting and whole-genome amplification of prokaryotes from two subtropical gyres, we obtained genomic DNA from 738 cells representing most cosmopolitan lineages. Multiple cells of Deltaproteobacteria cluster SAR324, Gammaproteobacteria clusters ARCTIC96BD-19 and Agg47, and some Oceanospirillales from the lower mesopelagic contained ribulose-1,5-bisphosphate carboxylase-oxygenase and sulfur oxidation genes. These results corroborated community DNA and RNA profiling from diverse geographic regions. The SAR324 genomes also suggested C1 metabolism and a particle-associated life-style. Microautoradiography and fluorescence in situ hybridization confirmed bicarbonate uptake and particle association of SAR324 cells. Our study suggests potential chemolithoautotrophy in several uncultured Proteobacteria lineages that are ubiquitous in the dark oxygenated ...
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A moderately salt-tolerant and obligately alkaliphilic, chemolithoautotrophic sulfur-oxidizing bacterium, strain HL-EbGr7T, was isolated from a full-scale bioreactor removing H2S from biogas under oxygen-limited conditions. Another strain, ALJ17, closely related to HL-EbGr7T, was isolated from a Kenyan soda lake. Cells of the isolates were relatively long, slender rods, motile by a polar flagellum. Although both strains were obligately aerobic, micro-oxic conditions were preferred, especially at the beginning of growth. Chemolithoautotrophic growth was observed with sulfide and thiosulfate in a pH range of 8.0-10.5 (optimum at pH 10.0) and a salinity range of 0.2-1.5 M total Na+ (optimum at 0.4 M). The genome sequence of strain HL-EbGr7T demonstrated the presence of genes encoding the reverse Dsr pathway and a truncated Sox pathway for sulfur oxidation and enzymes of the Calvin-Benson cycle of autotrophic CO2 assimilation with ribulose-bisphosphate carboxylase/oxygenase (RuBisCO) type I. The dominant
Sulfur is an essential element for life and the metabolism of organic sulfur compounds plays an important role in the global sulfur cycle. Sulfur occurs in various oxidation states ranging from +6 in sulfate to -2 in sulfide (H2S). Sulfate reduction can occur in both an energy consuming assimilatory pathway and an energy producing dissimilatory pathway. The assimilatory pathway, which is found in a wide range of organisms, produces reduced sulfur compounds for the biosynthesis of S-containing amino acids and does not lead to direct excretion of sulfide. In the dissimilatory pathway, which is restricted to obligatory anaerobic bacterial and archaeal lineages, sulfate (or sulfur) is the terminal electron acceptor of the respiratory chain producing large quantities of inorganic sulfide. Both pathways start from the activation of sulfate by reaction with ATP to form adenylyl sulfate (APS). In the assimilatory pathway [MD:M00176] APS is converted to 3-phosphoadenylyl sulfate (PAPS) and then reduced ...
TY - JOUR. T1 - Nucleotide sequence and expression of a deep-sea ribulose-1,5-bisphosphate carboxylase gene cloned from a chemoautotrophic bacterial endosymbiont. AU - Stein, Jeffrey L.. AU - Haygood, Margo. AU - Felbeck, Horst. PY - 1990/11. Y1 - 1990/11. N2 - The gene coding for ribulose-1,5-bisphosphate carboxylase [RuBisCO; 3-phospho-D-glycerate carboxy-lyase (dimerizing), EC 4.1.1.39] was cloned from a sulfur-oxidizing chemoautotrophic bacterium that resides as an endosymbiont within the gill tissues of Alvinoconcha hessleri, a gastropod inhabiting deep-sea hydrothermal vents. Nucleotide sequence analysis of the cloned fragment demonstrated that the genes encoding the large (RbcL) and small (RbcS) subunits of the symbiont RuBisCO were organized similarly to the RuBisCO operons of free-living photo- and chemoautotrophic prokaryotes. The symbiont rbcL gene shared the highest degree of nucleotide sequence identity with the cyanobacterium Anabaena (69%) while the rbcS nucleotide sequence shared ...
I studied Biomedical Sciences at the University of Applied Sciences Tyrol. The topic of my Bachelor thesis was to evaluate the spread of chemolithoautotrophic bacteria in various Austrian lakes using the CARD-FISH (Catalyzed Reporter Deposition - Flourescence In Situ Hybridisation) method.. Now I am supporting the Molecular Ecology Group with their current research topics as a technical assistant. ...
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ABSTRACT: Vertical distributions of viable (most probable number, MPN) aerobic chemoautotrophic thiobacilli-like sulfur-oxidizing bacteria (ca. 70 samples in triplicate for MPN counts) and dark 14C-bicarbonate incorporation rates were analyzed in a series of sulfide-rich lakes. A special device for sampling sharply stratified populations on the scale of a few centimeters was used. Detailed analyses focused on the oxic-anoxic transition zone where aerobic sulfur-oxidizing bacteria should display positive chemotaxis, and in both fully oxic epilimnia and sulfide-rich anoxic hypolimnia. Kinetics of sulfide and thiosulfate potential oxidations in the presence of oxygen were followed in microcosm enrichments in one of the lakes. The highest MPN counts (,104 to 105 cells ml-1) were observed at the oxic-anoxic interfaces and in the depleted hypolimnia (1.3 ± 4.4 × 104 cells ml-1), whereas 1 order of magnitude lower concentrations were detected in the epilimnia (1.0 ± 2.3× 103 cells ml-1). Dark ...
... and plants that can convert visible light into chemi- cal energy. In addition, chemoautotrophic bacteria can produce organic molecules from CO2 in the ab- sence of light. They use ...
1Arp AJ, Childress JJ, Fisher CR. "Blood gas transport in Riftia pachyptila." Bull Biol Soc Wash, 1985, 6:289-300 2Arp AJ, Childress JJ, Vetter RD. "The sulphide-binding protein in the blood of the vestimentiferan tube-worm, Riftia Pachyptila, is the extracellular haemoglobin." J Exp Biol, 1987, 128:139-158 3Bright M, Keckeis H, Fisher CR. "An autoradiographic examination of carbon fixation, transfer and utilization in the Riftia pachyptila symbiosis." Biology, 2000, 136:621-632 4Cavanaugh CM, Gardiner SL, Jones ML, Jannasch HW, Waterbury JB. "Pro- karyotic cells in the hydrothermal vent tube worm Riftia pachyptila." Science, 1981, 213:340-342 5Childress JJ, Fisher CR, Favuzzi JA, Kochevar RE, Sanders NK, Alayse AM. "Sulfide-driven autotrophic balance in the bacterial symbiont-containing hydrother- mal vent tubeworm, Riftia pachyptila." Biol Bull, 1991, 180:135-153 6Elderfield H, Schultz A. "Mid-ocean ridge hydrothermal fluxes and the chemical composition of the ocean." Annu Rev Earth Plant Sci, ...
Metabolic network showing the number of O. carboxidovorans proteins identified in each COG category in the current study.Proteins (referred by locus tag number
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Indigenous bacteria found in the sediment of the Emerald Basin (depth of 215 m, Atlantic Ocean) located offshore of Halifax Harbour (Nova Scotia, Canada) were previously found to be able to degrade the explosive compound hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). In the present study, a novel obligately respiratory, denitrifying and RDX-mineralizing bacterium, designated strain HAW-EB4T, was isolated from the marine sediment. This bacterium utilized peptone, yeast extract, Casamino acids, esters (Tweens 20, 40 and 80), sugars (N-acetyl-d-glucosamine, ribose), several C2 and C3 acids (acetate, pyruvate, lactate, propionate) and amino acids (serine, proline) as sole carbon and energy sources. Aerobically grown cells (in marine broth 2216 at 10 °C) contained C14 : 0 (6 %), iso-C15 : 0 (12 %), C16 : 0 (20 %), C16 : 1 ω7 (37 %), C18 : 1 ω7 (7 %) and C20 : 5 ω3 (7 %) as major membrane fatty acids, and Q7 (28·1 %) and MK-7 (60·9 %) as dominant respiratory quinones, consistent with deep-sea species of
Antral washout can be performed under general or local anaesthetic. The bone between your sinus and the inside of your nose is very thin. Your surgeon will pass a very fine metal tube into your nose through this thin bone. They will flush the area with sterile saline solution to get rid of any infection and open the drain hole. They may send a sample of the flushed solution to a lab for analysis. If the drain hole is badly blocked they may enlarge the drain to ensure infection can drain away easily. The metal tube is removed. Since the inside of your nose heals very quickly there is no need for stitches.. Antral washout is usually performed as a day case meaning you can go home the day of the procedure. ...
A new mesophilic, chemolithoautotrophic, sulfur-oxidizing bacterium, strain Milos-BII1T, was isolated from a sediment sample taken from a shallow-water hydrothermal vent in the Aegean Sea with thiosulfate as electron donor and CO2 as carbon source. Based on the almost complete sequence of the 16S rRNA gene, strain Milos-BII1T forms a phylogenetic cluster with Thiobacillus hydrothermalis, Thiobacillus neapolitanus, Thiobacillus halophilus and Thiobacillus sp. W5, all of which are obligately chemolithoautotrophic bacteria. Because of their phylogenetic relatedness and their physiological similarities it is proposed to transfer these organisms to a newly established genus within the gamma-subclass of the Proteobacteria, Halothiobacillus gen. nov. (Kelly and Wood 2000). Strain Milos-BII1T represents a new species of this genus, named Halothiobacillus kellyi. Cells were Gram-negative rods and highly motile. The organism was obligately autotrophic and strictly aerobic. Nitrate was not used as electron ...
A metaproteomic survey of surface coastal waters near Palmer Station on the Antarctic Peninsula, West Antarctica, was performed, revealing marked differences in the functional capacity of summer and winter communities of bacterioplankton. Proteins from Flavobacteria were more abundant in the summer metaproteome, whereas winter was characterized by proteins from ammonia-oxidizing Marine Group I Crenarchaeota. Proteins prevalent in both seasons were from SAR11 and Rhodobacterales clades of Alphaproteobacteria, as well as many lineages of Gammaproteobacteria. The metaproteome data were used to elucidate the main metabolic and energy generation pathways and transport processes occurring at the microbial level in each season. In summer, autotrophic carbon assimilation appears to be driven by oxygenic photoautotrophy, consistent with high light availability and intensity. In contrast, during the dark polar winter, the metaproteome supported the occurrence of chemolithoautotrophy via the ...
Oxygen Sensitivity of Anammox and Coupled N-Cycle Processes in Oxygen Minimum Zones. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
The goal of the Arabian Sea section of the TARA oceans expedition was to study large particulate matter (LPM , 100 μm) distributions and possible impact of associated midwater biological processes on vertical carbon export through the oxygen minimum zone (OMZ) of this region. We propose that observed spatial patterns in LPM distribution resulted from the timing and location of surface phytoplankton bloom, lateral transport, microbial processes in the core of the OMZ, and enhanced biological processes mediated by bacteria and zooplankton at the lower oxycline. Indeed, satellite-derived net primary production maps showed that the northern stations of the transect were under the influence of a previous major bloom event while the most southern stations were in a more oligotrophic situation. Lagrangian simulations of particle transport showed that deep particles of the northern stations could originate from the surface bloom while the southern stations could be considered as driven by 1-D vertical ...
Ligia L. Perez-Cruz, Maria Luisa Machain-Castillo; Benthic foraminifera of the oxygen minimum zone, continental shelf of the Gulf of Tehuantepec, Mexico. Journal of Foraminiferal Research ; 20 (4): 312-325. doi: https://doi.org/10.2113/gsjfr.20.4.312. Download citation file:. ...
General Information: This strain was isolated from a deep-sea hydrothermal vent in the Iheya North field in the Mid-Okinawa Trough, Japan as part of a larger diversity study. This rod-shaped bacterium grows chemolithoautotrophically and can utilize a wide spectrum of electron donors and acceptors (i.e. hydrogen, sulfur compounds, nitrate and oxygen). It can occupy different ecological niches, and its metabolic versatility probably enables it to adapt to the geochemical variability in deep-sea hydrothermal environments. ...
Originally isolated from the biomass of an Alvinella pompejana episymbiont community collected at 13 degrees N along the East Pacific Rise Axial Caldera ...
Huber, H., Jannasch, H., Rachel, R., Fuchs, T., and Stetter, K.O. 1997. Archaeoglobus veneficus sp. nov., a novel facultative chemolithoautotrophic hyperthermophilic sulfite reducer, isolated from abyssal black smokers. Syst. Appl. Microbiol. 20:374-380 ...
... (OMZ) are the places in the world ocean where oxygen saturation in the water column is at its lowest. This zone typically occurs at depths of about 200 to 1,000 meters. The AOG lab is interested in OMZs because of their importance in controlling carbon and nitrogen cycling in the oceans. OMZ water is exposed to the rain of sinking organic matter, which we evaluate using our drifting net traps and in situ incubators. Bacteria and archea feed on this organic matter and oxygen is used. Thus, the concentration of oxygen in deep water is dependent on the amount of oxygen it had when it was at the surface minus depletion by deep sea organisms.. In many OMZ regions oxygen actually reaches zero, in which case the OMZ can be called an ODZ (oxygen deficient zone). ODZs provide appropriate conditions to enable substantial nitrogen loss because in the absence of oxygen, nitrate represents the next best electron acceptor available for respiration. Starting with organic nitrogen ...
Multidisciplinary ocean observing activities provide critical ocean information to satisfy ever-changing socioeconomic needs and require coordinated implementation. The upper oxycline (transition between high and low oxygen waters) is fundamentally important for the ecosystem structure and can be a useful proxy for multiple observing objectives connected to eastern boundary systems (EBSs) that neighbor oxygen minimum zones (OMZs). The variability of the oxycline and its impact on the ecosystem (VOICE) initiative demonstrates how societal benefits drive the need for integration and optimization of biological, biogeochemical, and physical components of regional ocean observing related to EBS. In liaison with the Global Ocean Oxygen Network, VOICE creates a roadmap toward observation-model syntheses for a comprehensive understanding of selected oxycline-dependent objectives. Local to global effects, such as habitat compression or deoxygenation trends, prompt for comprehensive observing of the oxycline on
Fish scales accumulating in marine laminated sediments can provide a record of population variability of small pelagic fishes. Although some studies have noted signs of scale degradation that could affect estimates of population variability, there are presently no well-developed means to evaluate degradation. We developed several indices as indicators of fish scale preservation in two box-cores that we collected off Pisco (14°S), one at 301 m near the center of the oxygen minimum zone (OMZ), and the other at 201 m near the upper limit of the OMZ. These indices include (1) an index of fish scale integrity (estimate of scale wholeness relative to fragmentation), (2) the fungi-free area of fish scales and vertebrae, (3) the ratio of fish scales to vertebrae (as well as fish scales to vertebrae and bones), and (4) the ratio of whole scales to fragments. We address whether lower numbers of anchovy scales occurring in association with reduced total organic carbon fluxes and higher bottom-water oxygen ...
Key interests (as of today) What drives the oxygenation of marine basins over decadal, centennial and multimillenial timescales? (How: applying productivity and redox proxies to a collection of high-resolution sediment cores from oxygen-deficient marine settings) What is the fate of modern Oxygen Minimum Zones as they start responding to climate change? (How: finding past analogs for…
Carbon fixation is a part of the photosynthesis process that occurs during the second half, also known as the Calvin cycle. Carbon fixation itself refers to a large number of different carbon-related...
... serves as the only dedicated medium for the publication of peer-reviewed research on all phases of geochemistry in which organic...
McEachran, J.D. and K.A. Dunn, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref. 27314 ...
Definition of carbon fixation - the incorporation of carbon into organic compounds by living organisms, chiefly by photosynthesis in green plants.
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Nytoft, H-P., Kildahl-Andersen, G., Lindström, S., Rise, F., Bechtel, A., Mitrovic, D., Dokovic, N., Zivotic, D. & Stojanovic, K., 1 Mär 2019, in : Organic geochemistry. 129.2019, March, S. 14-23 10 S.. Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed) ...
The biocathodic reduction of nitrate in Microbial Fuel Cells (MFCs) is an alternative to remove nitrogen in low carbon to nitrogen wastewater and relies entirely on microbial activity. In this paper the community composition of denitrifiers in the cathode of a MFC is analysed in relation to added electron acceptors (nitrate and nitrite) and organic matter in the cathode. Nitrate reducers and nitrite reducers were highly affected by the operational conditions and displayed high diversity. The number of retrieved species-level Operational Taxonomic Units (OTUs) for narG, napA, nirS and nirK genes was 11, 10, 31 and 22, respectively. In contrast, nitrous oxide reducers remained virtually unchanged at all conditions. About 90% of the retrieved nosZ sequences grouped in a single OTU with a high similarity with Oligotropha carboxidovorans nosZ gene. nirS-containing denitrifiers were dominant at all conditions and accounted for a significant amount of the total bacterial density. Current production ...
Some regions of the deep ocean floor support abundant populations of organisms, despite being overlain by water that contains very little oxygen, according to an international study led by scientists at the United Kingdoms National Oceanography Center, Southampton. But global warming is likely to exacerbate oxygen depletion and thereby reduce biodiversity in these regions, they warn.. The sunlit surface waters tend to be well oxygenated as a result of their connection with the atmosphere. Here, tiny marine algae called phytoplankton thrive. When they die and sink, they are degraded by bacteria, using oxygen from the water column.. In regions of high plant growth, this can result in the natural development of mid-water oxygen minimum zones (OMZs), especially where oxygen is not replenished by mixing of the water column. Where they touch the continental slope, OMZs create strong seafloor oxygen gradients at depths between 100 and 1000 m.. In addition to low oxygen, sediments within OMZs often ...
Estimates of macrofaunal secondary production and normalized biomass size-spectra (NBSS) were constructed for macrobenthic communities associated with the oxygen minimum zone (OMZ) in four areas of the continental margin off Chile. The presence of low oxygen conditions in the Humboldt Current System (HCS) off Chile was shown to have important effects on the size structure and secondary production of the benthic communities living in this ecosystem. The distribution of normalized biomass by size was linear (log2log2 scale) at all stations. The slope of the NBSS ranged from -0.481 to-0.908. There were significant differences between the slopes of the NBS-spectra from the stations located in the OMZ (slope = - 0.837) and those located outside the OMZ(slope = - 0.463) (p , 0.05). The results of this study suggest that low oxygen conditions (, 0.5 ml L-1) appear to influence biomass size-spectra, because small organisms are better able to satisfy their metabolic demands. The annual secondary ...
The Humboldt (jumbo) squid, Dosidicus gigas, is a part-time resident of the permanent oxygen minimum zone (OMZ) in the Eastern Tropical Pacific and, thereby, it encounters oxygen levels below its critical oxygen partial pressure. To better understand the ventilatory mechanisms that accompany the process of metabolic suppression in these top oceanic predators, we exposed juvenile D. gigas to the oxygen levels found in the OMZ (1% O2, 1kPa, 10ºC) and measured metabolic rates, activity cycling patterns, swimming mode, escape-jet (burst) frequency, mantle contraction frequency and strength, stroke volume and oxygen extraction efficiency. In normoxia, the metabolic rates varied between 14 to 29 µmol O2 g (ww)-1 h-1, depending on the level of activity. The mantle contraction frequency and strength was linearly correlated and increased significantly with activity level. Additionally, an increased stroke volume and ventilatory volume per minute were observed, followed by a mantle hyperinflation ...
Chemoautotrophic symbioses, in which endosymbiotic bacteria are the major source of organic carbon for the host, are found in marine habitats where sulfide and oxygen coexist. The purpose of this study was to determine the influence of pH, alternate sulfur sources, and electron acceptors on carbon fixation and to investigate which form(s) of inorganic carbon is taken up and fixed by the gamma-proteobacterial endosymbionts of the protobranch bivalve Solemya velum. Symbiont-enriched suspensions were generated by homogenization of S. velum gills, followed by velocity centrifugation to pellet the symbiont cells. Carbon fixation was measured by incubating the cells with (14)C-labeled dissolved inorganic carbon. When oxygen was present, both sulfide and thiosulfate stimulated carbon fixation; however, elevated levels of either sulfide (|0.5 mM) or oxygen (1 mM) were inhibitory. In the absence of oxygen, nitrate did not enhance carbon fixation rates when sulfide was present. Symbionts fixed carbon most rapidly
A sulfur-oxidizing bacterial group called SUP05 will play an increasingly important role in carbon and nutrient cycling in the worlds oceans as oxygen minimum zones expand, according to research published this week in the Proceedings of the National Academy of Sciences.
Symbiosis, defined broadly as a long-term interaction between species, is among the most pervasive evolutionary and ecological strategies in marine ecosystems, impacting fundamental processes such as speciation, ecosystem structuring, primary production, nutrient cycling, and disease. Marine microbial symbioses span a striking diversity of hosts and symbionts from all three Domains of life. These associations vary widely in key biological factors, including the extent to which symbionts affect host fitness (e.g., mutualism vs. commensalism vs. parasitism), integrate into host tissue, and exchange genetic material with free-living microorganisms. Though such factors have been explored for certain well-studied associations, most marine symbioses remain understudied.. Our research explores the diversity, evolution, and function of symbioses between bacteria and animals. We focus primarily on marine symbioses, notably associations between deep-sea invertebrates and intracellular chemoautotrophic ...
Research begun at Princeton University found that the numerous small sea animals that migrate from the surface to deeper water every day consume vast amounts of what little oxygen is available in the oceans aptly named "oxygen minimum zone" daily. The findings reveal a crucial and underappreciated role that animals have in ocean chemistry on a global scale. The figure above shows the various depths (in meters) that animals migrate to during the day to escape predators. Red indicates the shallowest depths of 200 meters (650 feet), and blue represents the deepest of 600 meters (2,000 feet). The black numbers on the map represent the difference (in moles, used to measure chemical content) between the oxygen at the surface and at around 500 meters deep, which is the best parameter for predicting migration depth. (Courtesy of Daniele Bianchi ...
Biology Assignment Help, Nutrition - autotrophic nutrition, AUTOTROPHI C NUTRITION Preparation of organic food from the inorganic materials in the living body. May be photoautrophic, e.g. Euglena virdisima. May be chemoautotrophic e.g. Nitrifying bacteria.
Essential elements food security | Inorganic geochemistry facility | Analytical geochemistry | BGS laboratory capability | Science facilities | British Geological Survey (BGS)
Al-Mutairi, H. and Landry, M. R.: Active export of carbon and nitrogen at station ALOHA by diel migrant zooplankton, Deep-Sea Res. Pt. II, 48, 2083-2103, https://doi.org/10.1016/S0967-0645(00)00174-0, 2001. Andersen, V., Devey, C., Gubanova, A., Picheral, M., Melnikov, V., Tsarin, S., and Prieur, L.: Vertical distributions of zooplankton across the Almeria-Oran frontal zone (Mediterranean Sea), J. Plankton Res., 26, 275-293, https://doi.org/10.1093/plankt/fbh036, 2004. Antezana, T.: Vertical distribution and diel migration of Euphausia mucronata in the oxygen minimum layer of the Humboldt Current, Oceanogr. East. Pacific II, 2, 13-28, 2002. Antezana, T.: Species-specific patterns of diel migration into the Oxygen Minimum Zone by euphausiids in the Humboldt Current Ecosystem, Prog. Oceanogr., 83, 228-236, https://doi.org/10.1016/j.pocean.2009.07.039, 2009. Antezana, T.: Euphausia mucronata: A keystone herbivore and prey of the Humboldt Current System, Deep-Sea Res. Pt. II, 57, 652-662, ...
Iron (Fe) and copper (Cu) are essential cofactors for microbial metalloenzymes, but little is known about the metalloenyzme inventory of anaerobic marine microbial communities despite their importance to the nitrogen cycle. We compared dissolved O2, NO3−, NO2−, Fe and Cu concentrations with nucleic acid sequences encoding Fe and Cu-binding proteins in 21 metagenomes and 9 metatranscriptomes from Eastern Tropical North and South Pacific oxygen minimum zones and 7 metagenomes from the Bermuda Atlantic Time-series Station. Dissolved Fe concentrations increased sharply at upper oxic-anoxic transition zones, with the highest Fe:Cu molar ratio (1.8) occurring at the anoxic core of the Eastern Tropical North Pacific oxygen minimum zone and matching the predicted maximum ratio based on data from diverse ocean sites. The relative abundance of genes encoding Fe-binding proteins was negatively correlated with O2, driven by significant increases in genes encoding Fe-proteins involved in dissimilatory ...
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Phenotypic and phylogenetic comparisons of the generaBeggiatoa and Thioploca. Until recently, massive natural occurrence of filaments ofBeggiatoa or Thioploca spp. have been identified based solely on their characteristic morphologies by using (i) the presence (Thioploca spp.) or absence (Beggiatoa spp.) of a single sheath around multiple filaments and (ii) filament widths as the major criteria (Table 1). No strain of a wide marine Beggiatoa orThioploca sp. has been obtained in pure culture. The physiological properties of these genera can, therefore, be determined only from observations of natural populations. Such studies have revealed several metabolic similarities. These similarities include chemoautotrophic carbon metabolism (20, 24, 29, 31), sulfide oxidation (20, 25), and concentration of nitrate in the vacuolate cells at levels several-thousand-fold above ambient nitrate levels (5, 24). Teske et al. (38) described the phylogenetic position of vacuolate, unusually wideThioploca filaments ...
Hyperthermophilic, sulfur-metabolizing organism. Cells are irregular spheres with a glycoprotein envelope and monopolar flagella. They grow between 60 and 95 degrees Celsius but their optimum is 83 degrees Celsius. They can be either organoheterotrophic using a variety of carbon and energy sources or they can also be lithoautotrophic using hydrogen, thiosulphate and carbon dioxide. (HAMAP: ARCFU ...
A window into the mantle: analyzing the geochemistry of melt inclusions from the volcanic island of Mangaia. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
Valentin R. Troll, Chair of Petrology at Uppsala University, Sweden | Igneous petrology & geochemistry / High-T-isotope geochemistry / Micro-analytical methodologies / Mineral-thermobarometry / Geochemical and isotope modelling / Experimental volcanology and petrology
Evidence for an extensive hydrothermal plume in the Tonga-Fiji region of the South Pacific. Geochemistry, Geophysics, Geosystems. 5:n/a-n/a. 2004 ...