Stability of stratification and its effect on the accumulation of ferrous iron in meromictic Lake Towuti

Kapabilitas citra satelit hiperspektral yang memiliki keunggulan spektral sangat berpotensi untuk dimanfaatkan dalam eksplorasi keberadaan reservoir onshore. Kemampuan ini dilakukan melalui perekaman spektral fenomena rembesan mikro hidrokarbon yang menimbulkan ekspresi anomali spektral tanah dan menjadi kunci keberadaan sumber hidrokarbon. Dalam penelitian ini, Sub-Cekungan Jatibarang dipilih sebagai wilayah penelitian. Berdasarkan teori spektral rembesan mikro hidrokarbon, citra Hyperion dapat digunakan sebagai alat untuk mendeteksi keberadaan fenomena rembesan mikro hidrokarbon sebagai penduga keberadaan reservoir onshore karena memiliki spektrum panjang gelombang yang peka terhadap objek anomali hidrokarbon. Sehingga, penelitian ini bertujuan untuk mendeteksi area rembesan mikro hidrokarbon dengan citra Hyperion di Cekungan Jatibarang. Hydrocarbon Index (HI) yang memanfaatkan saluran 155 (1.699 nm), 158 (1.729 nm), dan 160 (1.749 nm) digunakan sebagai algoritma untuk medeteksi area rembesan mikro hidrokarbon di Sub-Cekungan Jatibarang. Gejala anomali alterasi kaolinite, ferrous iron dan gejala anomali vegetasi dengan indeks NDVI digunakan sebagai pembanding akurasi HI. Hasil penelitian ini menunjukkan adanya sebaran rembesan mikro hidrokarbon di wilayah Kecamatan Tukdana (Indramayu), Kecamatan Pasekan (Indramayu), dan Kecamatan Ligung (Majalengka). Area sebaran rembesan mikro hidrokarbon teraglomerasi pada wilayah pesisir utara Kecamatan Pasekan. Secara umum, keberadaan rembesan mikro hidrokarbon berkorelasi dengan tingkat anomali alterasi kaolinite, ferrous iron, dan anomali vegetasi.

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Synthesis and Breakdown of the Universal Precursors to Biological Metabolism Promoted by Ferrous Iron

10.26434/chemrxiv.7178930.v1 ◽

2018 ◽

Cited By ~ 1

Author(s):

Kamila B. Muchowska ◽

Sreejith Jayasree VARMA ◽

Joseph Moran

Keyword(s):

Amino Acids ◽

Chemical Reaction ◽

Metabolic Pathways ◽

Ferrous Iron ◽

Reaction Network ◽

Tca Cycle ◽

Chemical Reaction Network ◽

Metabolic Precursors ◽

Tca Cycle Intermediates

How core biological metabolism initiated and why it uses the intermediates, reactions and pathways that it does remains unclear. Life builds its molecules from CO2 and breaks them down to CO2 again through the intermediacy of just five metabolites that act as the hubs of biochemistry. Here, we describe a purely chemical reaction network promoted by Fe2+ in which aqueous pyruvate and glyoxylate, two products of abiotic CO2 reduction, build up nine of the eleven TCA cycle intermediates, including all five universal metabolic precursors. The intermediates simultaneously break down to CO2 in a life-like regime resembling biological anabolism and catabolism. Introduction of hydroxylamine and Fe0 produces four biological amino acids. The network significantly overlaps the TCA/rTCA and glyoxylate cycles and may represent a prebiotic precursor to these core metabolic pathways.

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Efficacy and Safety of Ferrous Iron on the Prevention of Vascular Cognitive Impairment Among Patients With Cerebral Infarction/TIA (FAVORITE)

Case Medical Research ◽

10.31525/ct1-nct03891277 ◽

2019 ◽

Author(s):

Keyword(s):

Cognitive Impairment ◽

Cerebral Infarction ◽

Ferrous Iron ◽

Vascular Cognitive Impairment ◽

Efficacy And Safety

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Faculty Opinions recommendation of Vibrio cholerae VciB promotes iron uptake via ferrous iron transporters.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1120776.577025 ◽

2008 ◽

Author(s):

Simon Andrews

Keyword(s):

Vibrio Cholerae ◽

Ferrous Iron ◽

Iron Uptake

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Critical Coagulation Concentration of Paddy Soil Clays in Sodium–Ferrous Iron Electrolyte

Soil Science Society of America Journal ◽

10.2136/sssaj2004.0789 ◽

2004 ◽

Vol 68 (3) ◽

pp. 789 ◽

Cited By ~ 8

Author(s):

Atinut Saejiew ◽

Olivier Grunberger ◽

Somsri Arunin ◽

Fabienne Favre ◽

Daniel Tessier ◽

...

Keyword(s):

Paddy Soil ◽

Ferrous Iron ◽

Critical Coagulation Concentration ◽

Soil Clays

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Transjøen, a Groundwater Influenced Lake with Special Redox and Sulphate Conditions

Hydrology Research ◽

10.2166/nh.1976.0020 ◽

1976 ◽

Vol 7 (5) ◽

pp. 307-320 ◽

Cited By ~ 1

Author(s):

G. S. Bremmeng ◽

A. E. Kloster

Keyword(s):

Calcium Carbonate ◽

Chemical Composition ◽

Lower Layer ◽

Calcium Content ◽

Meromictic Lake ◽

Redox Potentials ◽

Precipitated Calcium Carbonate

Transjøen, a lake in S.E. Norway investigated hydrographically from October 1969 to October 1971, consists of two basins, both of which are meromictic (lake with lower layer which does not participate in the periodic circulations). The lake has a large influx of groundwater of very varying chemical composition. The calcium content is high and precipitated calcium carbonate and electrolyte rich groundwater is assumed to be the main reason for the meromictic stability. The redox potentials of monimolimnion (the lower layer which does not participtate in the periodic circulation) are extremely low, but in spite of this fact the content of sulphate is high.

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MAPPING MICROBIAL COMMUNITY COMPOSITION AND GEOCHEMICAL GRADIENTS AT HIGH SPATIAL RESOLUTION IN A MEROMICTIC LAKE (GREEN LAKE, FAYETTEVILLE, NEW YORK)

10.1130/abs/2017ne-291272 ◽

2017 ◽

Author(s):

Jonah Boucher ◽

◽

Jeff Havig ◽

Trinity L. Hamilton ◽

Dionysios A. Antonopoulos ◽

...

Keyword(s):

New York ◽

Microbial Community ◽

Community Composition ◽

Spatial Resolution ◽

High Spatial Resolution ◽

Microbial Community Composition ◽

Meromictic Lake ◽

Green Lake

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Ferrous iron oxidation in moderately thermophilic acidophile Sulfobacillus sibiricus N1T

Canadian Journal of Microbiology ◽

10.1139/w10-063 ◽

2010 ◽

Vol 56 (10) ◽

pp. 803-808 ◽

Cited By ~ 10

Author(s):

Tatiana Y. Dinarieva ◽

Anna E. Zhuravleva ◽

Oksana A. Pavlenko ◽

Iraida A. Tsaplina ◽

Alexander I. Netrusov

Keyword(s):

Ferrous Iron ◽

High Performance ◽

Iron Oxidation ◽

Early Exponential Phase ◽

Moderately Thermophilic ◽

Terminal Oxidases ◽

Cytochrome Bo ◽

Ferrous Iron Oxidation ◽

Transport Chain ◽

Membrane Bound

The iron-oxidizing system of a moderately thermophilic, extremely acidophilic, gram-positive mixotroph, Sulfobacillus sibiricus N1T, was studied by spectroscopic, high-performance liquid chromatography and inhibitory analyses. Hemes B, A, and O were detected in membranes of S. sibiricus N1T. It is proposed that the electron transport chain from Fe2+ to O2 is terminated by 2 physiological oxidases: aa3-type cytochrome, which dominates in the early-exponential phase of growth, and bo3-type cytochrome, whose role in iron oxidation becomes more prominent upon growth of the culture. Both oxidases were sensitive to cyanide and azide. Cytochrome aa3 was more sensitive to cyanide and azide, with Ki values of 4.1 and 2.5 µmol·L–1, respectively, compared with Ki values for cytochrome bo3, which were 9.5 µmol·L–1 for cyanide and 7.0 µmol·L–1 for azide. This is the first evidence for the participation of a bo3-type oxidase in ferrous iron oxidation. The respiratory chain of the mixotroph contains, in addition to the 2 terminal oxidases, a membrane-bound cytochrome b573.

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