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Related Concept Videos

Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
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Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Mass Spectrometry: Molecular Fragmentation Overview01:20

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

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Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids
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Chemical evolution as a tool for molecular discovery.

S Jarrett Wrenn1, Pehr B Harbury

  • 1Department of Biochemistry, Stanford University, Stanford, California 94305, USA. sjwrenn@stanford.edu

Annual Review of Biochemistry
|May 18, 2007
PubMed
Summary

Chemical evolution enables discovery of novel molecules beyond biopolymers. Expanding chemical diversity in vitro evolution libraries overcomes limitations of enzyme-dependent synthesis for broader applications.

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Area of Science:

  • Biotechnology
  • Synthetic Chemistry
  • Drug Discovery

Background:

  • Evolutionary strategies are vital for identifying biopolymers with novel activities in academic and industrial settings.
  • Current in vitro evolution methods are limited by enzyme-dependent synthesis, restricting chemical diversity.

Purpose of the Study:

  • To explore the application of evolutionary strategies to libraries of arbitrary chemical composition.
  • To overcome the limitations of biopolymer-based evolution for broader small-molecule discovery.
  • To review current research expanding the chemical repertoire of in vitro evolution.

Main Methods:

  • Broadening enzyme substrate specificities to include unnatural building blocks.
  • Developing methods to translate DNA sequences into multistep organic syntheses.
  • Analyzing strengths and weaknesses of different approaches to chemical evolution.

Main Results:

  • Enzyme-based limitations restrict the chemical diversity of current in vitro evolution libraries.
  • Expanding enzyme substrate specificities and DNA-to-synthesis translation are key research areas.
  • Novel chemical evolution strategies promise to revolutionize small-molecule discovery.

Conclusions:

  • Chemical evolution offers a powerful approach to discover molecules beyond natural biopolymers.
  • Expanding the chemical scope of in vitro evolution is crucial for advancing drug discovery.
  • Future research directions include refining enzyme capabilities and organic synthesis translation for broader applications.