Spontaneous Induction
Spontaneous Induction - Related Videos
03:17
Measuring Spontaneous Phage Induction in Lysogenic Bacteria Over Time
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2026
Source: Krishnamurthi, R., et al. Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics. J. Vis. Exp. (2024).This video demonstrates the temporal enumeration of spontaneous phage induction in lysogenic Pseudomonas aeruginosa by quantifying viable bacterial cells (CFUs) and infective phage particles (PFUs) over time. By sampling at defined intervals during growth and analyzing both colony and plaque formation, the method reveals when spontaneous induction...
02:21
Spontaneity
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2020
A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to the earth’s...
11:33
Inductance
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN This experiment will use inductive coils to demonstrate the concept of inductor and inductance. Magnetic induction will be demonstrated using a rod magnet inserted into or extracted away from the core of a coil to induce a transient electromotive force (emf) voltage in the coil, measured by a voltmeter. This experiment will also demonstrate the mutual inductance between...
08:06
Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster
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Cited by 16 •
2014
Drosophila melanogaster are useful in studying genetic or environmental manipulations that affect behaviors such as spontaneous locomotor activity. Here we describe a protocol that utilizes monitors with infrared beams and data analysis software to quantify spontaneous locomotor...
14:01
Anesthesia Induction and Maintenance
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN The Guide for the Care and Use of Laboratory Animals ("The Guide") states that pain assessment and alleviation are integral components of the veterinary care of laboratory animals. The definition of anesthesia is the loss of feeling or sensation. It is a dynamic event involving changes in anesthetic depth with respect to an animal's metabolism, surgical stimulation, or variations in the...
FAQs
Cellular stress and DNA damage can alter the regulatory state that normally maintains lysogeny. When this control changes, phage gene expression may begin, allowing the prophage to excise from the bacterial chromosome and proceed toward particle production and host-cell lysis. These links make spontaneous induction useful for examining how bacterial physiological conditions affect lysogenic stability.
Prophage excision removes the integrated phage genome from the bacterial chromosome and is followed by activation of phage gene expression. This transition can produce phage particles, which may lyse the original host cell and release viral material into the surrounding microbial population. The sequence connects a chromosome-level event with changes in population structure and phage persistence.
Spontaneous Induction occurs without deliberate exposure to an inducing treatment, whereas deliberate induction begins after an experimental intervention intended to trigger the lytic cycle. The spontaneous process is stochastic, so it can occur among only some lysogenic cells rather than uniformly across a population. This distinction matters when interpreting phage release and changes in host-cell survival.
Because spontaneous induction is stochastic, lysogenic bacteria can follow different fates within the same population. Some cells may retain lysogeny, while others excise the prophage, express phage genes, and undergo lysis. This uneven behavior can reshape bacterial population structure and helps explain how phages persist while periodically affecting their hosts.
Researchers can examine the appearance of phage particles and the occurrence of host-cell lysis as outcomes of spontaneous induction. They can also relate these events to the maintenance or loss of lysogenic stability and to changes in bacterial population structure. These observations provide experimental evidence for phage activity without requiring a deliberately applied inducing treatment.
The process is relevant whenever phage activity may influence the composition or behavior of a microbial community. Phage-mediated lysis can alter bacterial population structure, while persistent prophages can contribute to ongoing virus-host interactions. Considering spontaneous induction therefore helps researchers interpret community behavior as a dynamic balance between lysogenic persistence and occasional phage production.
Spontaneous induction provides a context for examining how prophage activation affects phage persistence and gene transfer within microbial populations. Excised prophages can generate phage particles, and the resulting interactions may influence the distribution of phage-associated genetic material. Studying these events connects cellular regulation with broader questions about microbial evolution, population change, and virus-host relationships.