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Related Concept Videos

Homogeneous Equilibria for Gaseous Reactions02:15

Homogeneous Equilibria for Gaseous Reactions

Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
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Allosteric Proteins-ATCase

Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Composite Bodies

A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...

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Related Experiment Video

Updated: Jun 14, 2026

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
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Published on: March 13, 2014

ALPHA-KETOGLUTARIC SEMIALDEHYDE: A METABOLIC INTERMEDIATE.

R M SINGH, E ADAMS

    Science (New York, N.Y.)
    |April 3, 1964
    PubMed
    Summary

    Researchers identified alpha-ketoglutaric semialdehyde, a previously unknown biological product, from hydroxyproline metabolism in Pseudomonas. This discovery opens new avenues for understanding microbial metabolic pathways.

    Area of Science:

    • Biochemistry
    • Microbiology
    • Enzymology

    Background:

    • Hydroxyproline is an amino acid found in collagen and other proteins.
    • Pseudomonas species are known for their diverse metabolic capabilities.
    • Understanding metabolic pathways is crucial for various biological and biotechnological applications.

    Purpose of the Study:

    • To identify and characterize novel metabolic products from hydroxyproline degradation in Pseudomonas.
    • To elucidate the enzymatic reactions involved in hydroxyproline metabolism.
    • To investigate the potential roles of newly identified metabolites in microbial pathways.

    Main Methods:

    • Enzymatic assays using purified enzymes from Pseudomonas.
    • Chemical synthesis and characterization of alpha-ketoglutaric semialdehyde.
    Keywords:
    ALDEHYDESEXPERIMENTAL LAB STUDYHYDROXYPROLINEKETOGLUTARIC ACIDMETABOLISMPSEUDOMONAS

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  • Spectroscopic and chromatographic techniques for compound identification.
  • Enzymatic derivatization for structural confirmation.

    • Main Results:

    • Alpha-ketoglutaric semialdehyde was successfully isolated and identified as a product of hydroxyproline metabolism.
    • The compound was characterized using both chemical and enzymatic methods.
    • Its identity was confirmed by comparison with a chemically synthesized standard.
    • This reactive aldehyde was not previously recognized as a biological product.

    Conclusions:

    • Alpha-ketoglutaric semialdehyde is a novel intermediate in hydroxyproline metabolism in Pseudomonas.
    • The discovery suggests new enzymatic pathways within these microorganisms.
    • This compound may play a role in other, yet uncharacterized, metabolic routes.