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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Structure of Lipids03:38

Structure of Lipids

Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
Structure of Lipids03:38

Structure of Lipids

Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
Structure of Lipids03:38

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Structural Classification of Joints01:20

Structural Classification of Joints

Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least squares (OLS)...

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A Multimodal System for Lipid A Structural Analysis from a Single Colony.

Hyojik Yang1, Ian O'Keefe1, Richard D Smith1,2

  • 1Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, United States.

Analytical Chemistry
|August 16, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces positive ion mode mass spectrometry (FLAT+ and FLATn+) for rapid, de novo lipid A structure elucidation. These advanced methods, combined with existing techniques, enable comprehensive analysis of complex bacterial lipid A structures.

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Area of Science:

  • Microbiology
  • Analytical Chemistry
  • Structural Biology

Background:

  • Traditional lipid A structural elucidation relies on chemical extraction and negative ion mode tandem mass spectrometry (MS).
  • Previous methods (FLAT and FLATn) enabled rapid lipid A analysis without chromatography.
  • Limitations exist in fully characterizing complex and unusual lipid A structures.

Purpose of the Study:

  • To extend the FLAT (Fast Lipid A Analysis) technique for de novo lipid A structure determination using positive ion mode MS.
  • To develop multimodal approaches (FLAT+, FLATn+, FLAT, FLATn) for comprehensive lipid A structural analysis.
  • To characterize previously unknown lipid A structures from *Roseomonas mucosa* and *Moraxella canis*.

Main Methods:

  • Application of positive ion mode mass spectrometry (FLAT+ and FLATn+) for lipid A structural elucidation.
  • Analysis of fragmentation patterns, including selective dissociation of glycosidic bonds and acyl chains.
  • Direct structural determination from a single bacterial colony without prior chromatographic separation.

Main Results:

  • Positive ion mode MS provides more interpretable fragmentation patterns and diagnostic ions for lipid A analysis.
  • Characterization of a novel lipid A structure from *Roseomonas mucosa* with a nonconventional backbone and galacturonic acid modification.
  • Assignment of a single, discrete lipid A structure for *Moraxella canis* based on unique fragmentation patterns.

Conclusions:

  • The multimodal FLAT platform (FLAT+, FLATn+, FLAT, FLATn) significantly enhances the rapid characterization of complex and unusual lipid A structures.
  • Positive ion mode MS is a valuable addition for detailed lipid A structural analysis, complementing existing methods.
  • This approach facilitates efficient structural determination directly from bacterial colonies.