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Related Concept Videos

The Nucleosome01:19

The Nucleosome

Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
The Nucleosome02:33

The Nucleosome

DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...
The Nucleosome02:33

The Nucleosome

DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...
The Nucleus01:25

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
The Nucleus01:32

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
The Nucleus01:25

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

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Related Experiment Video

Updated: May 22, 2026

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
10:57

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

Published on: November 11, 2025

[Nucleus DNA content measurement methods features].

Iu G Pichugin, K A Sem'ianov, A V Chernyshev

    Tsitologiia
    |May 18, 2012
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new flow cytometry method for analyzing DNA histograms in Drosophila cells, improving cell cycle phase determination. The research highlights methods to enhance DNA content measurement precision.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Genetics

    Context:

    • Flow cytometry is a crucial technique for cell analysis.
    • Understanding cell cycle phases (G1, G2/M, S) is vital in biological research.
    • Drosophila melanogaster imaginal discs are a model system for developmental studies.

    Purpose:

    • To propose a novel theoretical method for analyzing flow cytometry DNA histograms.
    • To apply this method to Drosophila melanogaster imaginal discs cells.
    • To assess and improve the precision of DNA content measurements for cell cycle phase determination.

    Summary:

    • A new theoretical model for flow cytometry DNA histograms is presented and applied to Drosophila imaginal discs.
    • The model enables the determination of cell proportions in G1, G2 (M), and S phases.
    • Measurement precision is limited by the device's zero signal; using calculated zero and dividing cells as standards can enhance accuracy.

    Impact:

    • Provides a refined method for cell cycle analysis using flow cytometry.
    • Offers insights into improving the precision of DNA content measurements in biological samples.
    • Contributes to a better understanding of cell proliferation in model organisms.