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Related Concept Videos

Sulfur Assimilation01:20

Sulfur Assimilation

38
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...
38
Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.3K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.3K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.9K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.9K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

4.8K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
4.8K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

758
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
758
Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

37
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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H2S: A Simple Molecule with Multifaceted Biochemistry and Functions.

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Hydrogen sulfide (H₂S) has shifted from a toxic gas to a vital signaling molecule in plants and animals. This molecule plays a key role in physiological processes and cellular oxidative stress responses.

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Area of Science:

  • Biochemistry
  • Physiology
  • Cell Biology

Background:

  • Hydrogen sulfide (H₂S) was historically viewed as a toxic gas.
  • Recent research recognizes H₂S as a crucial signaling molecule in biological systems.

Discussion:

  • H₂S participates in numerous physiological processes in both plant and animal cells.
  • The molecule is integral to cellular responses against oxidative stress and pathological conditions.

Key Insights:

  • The dual role of H₂S as both a toxicant and a signaling molecule is now well-established.
  • H₂S involvement in oxidative stress mitigation is a significant area of study.

Outlook:

  • Future research should explore H₂S's multifaceted roles in plant and mammalian systems.
  • Investigating H₂S's therapeutic potential in oxidative stress-related diseases is a promising direction.