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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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[Dependency in Chile. Advances and challenges].

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Area of Science:

  • Gerontology
  • Public Health
  • Socioeconomics

Background:

  • Chile is experiencing rapid population aging.
  • Increased population dependency presents significant challenges.
  • The issue of dependency lacks prioritization and clear definition.

Purpose of the Study:

  • To highlight the lack of consensus on defining and measuring dependency in Chile.
  • To provide an updated estimation of dependency.
  • To stimulate further discussion and policy development on population dependency.

Main Methods:

  • Literature review on dependency definitions.
  • Analysis of existing Chilean data.
  • Development of an updated dependency estimation model.

Main Results:

  • No established consensus exists in Chile for defining or measuring dependency.
  • An updated estimation of the dependency ratio in Chile was calculated.
  • The findings underscore a critical data gap regarding population dependency.

Conclusions:

  • The absence of a clear definition hinders effective policy-making for an aging population.
  • Updated dependency data is crucial for addressing the challenges of population aging in Chile.
  • Further research and national dialogue are needed to establish standardized measures for dependency.