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Related Concept Videos

Overview of Advanced Functional Groups02:22

Overview of Advanced Functional Groups

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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.
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Exponential Functions with Base e01:30

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Exponential functions with base e are essential for modeling continuous processes of growth and decay. The constant e, approximately 2.718, naturally arises in systems where change occurs proportionally to the current value. A positive exponent represents continuous growth, while a negative exponent represents continuous decay. These functions are especially useful for describing situations where change happens smoothly over time rather than in discrete steps.One clear example of exponential...
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Extraction: Advanced Methods00:56

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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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.
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Functional Groups02:45

Functional Groups

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Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...
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Related Experiment Video

Updated: Jan 31, 2026

Large-Scale Screens of Metagenomic Libraries
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Recent Advances in Function-based Metagenomic Screening.

Tanyaradzwa Rodgers Ngara1, Houjin Zhang1

  • 1Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, MOE Key Laboratory of Molecular Biophysics, Wuhan 430074, China.

Genomics, Proteomics & Bioinformatics
|January 1, 2019
PubMed
Summary
This summary is machine-generated.

Function-based screening of metagenomes enables novel enzyme discovery. Advanced methods like FACS and droplet screening enhance the identification of new enzyme genes from uncultured microorganisms.

Keywords:
Agar plate screeningFACS-based screeningFunction-based screeningMetagenomicsMicrofluidics

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Area of Science:

  • Microbiology
  • Biotechnology
  • Genomics

Background:

  • Metagenomes from uncultured microorganisms are a valuable source of novel enzyme genes.
  • Screening methods for metagenomic libraries are broadly categorized into sequence-based and function-based approaches.
  • Function-based screening offers a pathway to discover novel genes without prior sequence knowledge.

Purpose of the Study:

  • To review function-based screening strategies for identifying enzymes from metagenomes.
  • To highlight the advantages of function-based approaches for discovering novel enzyme functions.
  • To discuss various screening techniques, from simple agar plates to ultra-high-throughput methods.

Main Methods:

  • Agar plate screening for its simplicity and broad applicability.
  • Microtiter plate screening for enhanced sensitivity.
  • Ultra-high-throughput methods including Fluorescence-Activated Cell Sorting (FACS)-based, droplet-based, and in vivo reporter-based screening.

Main Results:

  • Function-based screening is crucial for identifying enzymes with desired functions from metagenomic libraries.
  • Diverse screening methods exist, ranging in throughput and sensitivity.
  • Novel screening strategies significantly increase the likelihood of discovering new enzyme genes.

Conclusions:

  • Function-based screening is a powerful strategy for enzyme discovery from metagenomes.
  • The development of ultra-high-throughput methods has revolutionized the scale of metagenomic screening.
  • These advancements accelerate the identification of novel enzymes with potential biotechnological applications.