Light and electron microscope studies of mycobacterium--mycobacteriophage interactions. III. Further studies on the

Insights

Researchers studied mycobacteriophage B-1 multiplication using ultrathin sectioning. New phage particles emerged near the host cell

Area of Science:

  • Microbiology
  • Virology
  • Cell Biology

Background:

  • Mycobacteriophages are viruses that infect mycobacteria.
  • Understanding viral replication is crucial for controlling mycobacterial infections.

Purpose of the Study:

  • To investigate the replication process of mycobacteriophage B-1 within its host cell.
  • To characterize the morphological changes during phage multiplication.

Main Methods:

  • Utilized an improved ultrathin sectioning technique for electron microscopy.
  • Observed host cell and phage particle morphology throughout the infection cycle.

Main Results:

  • The host cell's nuclear apparatus remained unchanged during the latent period.
  • Phage-shaped particles appeared approximately 30 minutes post-infection in specific cellular regions.
  • Mature and empty phage heads were observed at the end of the latent period.

Conclusions:

  • Mycobacteriophage B-1 replication involves the formation of new particles in distinct areas of the host cell.
  • Empty phage head structures may be present within the host cell during the latent period.

Related Concept Videos

Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...