Sulfur Oxidizers
Sulfur Oxidizers - Related Videos
01:22
The Sulfur Cycle
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2019
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
03:14
Oxidation Numbers
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2020
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules. Oxidation Number (Oxidation State) In the case of an ionic compound, oxidation numbers are assigned based on the number of electrons transferred between reacting species. For example, in the formation of calcium...
01:20
Sulfur Assimilation
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2025
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
01:15
Pyruvate Oxidation
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2019
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells. First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
09:15
Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix
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2016
Herein we present a method to synthesize ligand-free cadmium sulfide (CdS) nanoparticles based on a unique sulfur copolymer. The sulfur copolymer operates as a high temperature solvent and a sulfur source during the nanoparticle synthesis and stabilizes the nanoparticles after the reaction.
FAQs
Chemolithotrophic energy conservation depends on coupling sulfur oxidation to electron transfer. Reduced sulfur compounds serve as electron donors, while oxygen or nitrate can serve as electron acceptors. This transfer generates the energy needed for microbial activity and converts the substrates toward more oxidized products, commonly including sulfate.
When oxygen is available, sulfur oxidation can proceed with oxygen as the terminal electron acceptor; nitrate provides an alternative in settings where oxygen is not the relevant acceptor. The available acceptor therefore helps shape the metabolic route, while resulting sulfate or sulfuric acid formation can alter pH and mineral chemistry.
Substrate choice matters because hydrogen sulfide, elemental sulfur, and thiosulfate do not represent the same starting point in sulfur oxidation. Sulfur oxidizers can use these reduced compounds as electron donors, but the resulting oxidation products and environmental effects depend on the compound being converted and the electron acceptor available.
In sulfur-rich soils, sediments, wastewater systems, and hydrothermal vents, these microorganisms connect sulfur transformations with local ecosystem chemistry. Their activity can move sulfur compounds toward more oxidized forms and influence pH or minerals through sulfuric acid production. In this way, sulfur oxidizers contribute to biogeochemical cycling across natural and engineered environments.
Their metabolic activity is relevant to environmental remediation because sulfur conversion changes chemical conditions in managed systems. The overview identifies wastewater systems as one setting and notes that sulfur oxidizers inform remediation studies. Researchers can therefore examine how oxidation affects pH and mineral chemistry when evaluating remediation approaches.
In industrial bioleaching, sulfur oxidizers are relevant because sulfur oxidation can modify mineral chemistry. Their conversion of reduced sulfur compounds, including elemental sulfur, may produce sulfate or sulfuric acid, linking microbial metabolism to chemical changes in mineral environments. This connection makes them useful subjects for studying how biology can influence mineral processing.