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Density00:56

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

Published on: November 11, 2025

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Artifact-free high-density localization microscopy analysis.

Richard J Marsh1, Karin Pfisterer1, Pauline Bennett1

  • 1Randall Centre for Cell and Molecular Biophysics, King's College London, London, UK.

Nature Methods
|August 1, 2018
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Summary
This summary is machine-generated.

High-density analysis in localization microscopy can cause artifacts. Combining Haar wavelet kernel (HAWK) analysis with single-frame fitting effectively eliminates these artifacts, enabling artifact-free super-resolution imaging.

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Area of Science:

  • Biophysics
  • Microscopy
  • Image Analysis

Background:

  • High-density analysis methods in localization microscopy accelerate image acquisition.
  • However, these methods often introduce artifacts that hinder accurate structural representation.

Purpose of the Study:

  • To develop and validate a method for artifact-free super-resolution imaging at high acquisition speeds.
  • To demonstrate the effectiveness of Haar wavelet kernel (HAWK) analysis in conjunction with standard single-frame fitting.

Main Methods:

  • Application of Haar wavelet kernel (HAWK) preprocessing to localization microscopy data.
  • Integration of HAWK analysis with standard single-frame fitting algorithms.
  • Testing the method on synthetic, fixed-cell, and live-cell datasets.

Main Results:

  • HAWK preprocessing successfully eliminated artifacts introduced by high-density analysis.
  • Reconstructed images accurately reflected the underlying sample structures.
  • The method enabled high-speed, artifact-free super-resolution imaging of live cells.

Conclusions:

  • The combination of HAWK analysis and single-frame fitting is a robust solution for artifact reduction in localization microscopy.
  • This approach facilitates high-speed, high-fidelity super-resolution imaging, particularly for dynamic biological processes in live cells.