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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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A link between aging and persistence.

A M Proenca1,2, C U Rang3, L Chao3

  • 1Immunology and Microbiology Laboratory, School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil.

Antimicrobial Agents and Chemotherapy
|February 21, 2025
PubMed
Summary
This summary is machine-generated.

Bacterial persistence, a survival strategy in infections, is driven by cellular aging and asymmetric damage partitioning. This study reveals how aging-related heterogeneity in bacterial populations triggers persistence, offering new treatment perspectives.

Keywords:
Escherichia coliagingmicrofluidicspersistence

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Area of Science:

  • Microbiology
  • Cellular Biology
  • Genetics

Background:

  • Microbial antibiotic resistance poses a significant global health threat.
  • Bacterial persistence, a dormant survival state, contributes to treatment failure.
  • The underlying mechanisms driving bacterial persistence remain incompletely understood.

Purpose of the Study:

  • To elucidate the unifying mechanism behind bacterial persistence.
  • To investigate the role of cellular aging and asymmetric damage partitioning in persistence.
  • To determine how population heterogeneity influences the triggering of persistence.

Main Methods:

  • Utilized single-cell microscopy to observe bacterial behavior.
  • Employed microfluidic devices for controlled population studies.
  • Analyzed growth rates, growth arrest probabilities, and persistence rates in relation to cellular damage.

Main Results:

  • Demonstrated that asymmetric damage partitioning, a form of cellular aging, generates phenotypic heterogeneity.
  • Showed that deterministic asymmetry in exponential phase prevents persister formation.
  • Observed that aging bacteria in stationary phase exhibit increased growth decline, arrest probability, and higher persistence rates.

Conclusions:

  • Bacterial persistence is triggered by population heterogeneity arising from cellular aging.
  • Asymmetric damage partitioning acts as a key factor in generating this heterogeneity.
  • Findings suggest unifying mechanisms for persistence and potential new strategies for treating persistent infections.