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Accelerators01:17

Accelerators

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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
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Mixtures of Acids03:27

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The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
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Adrenergic Agonists: Mixed-Action Agents01:28

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Admixture in Latin America.

Kaustubh Adhikari1, Javier Mendoza-Revilla1, Juan Camilo Chacón-Duque1

  • 1Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, UK.

Current Opinion in Genetics & Development
|October 1, 2016
PubMed
Summary
This summary is machine-generated.

Latin Americans, a diverse admixed population, offer unique insights into human genetics. Genetic analyses reveal their complex ancestry, aiding studies on human complex traits.

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Area of Science:

  • Population Genetics
  • Human Genomics
  • Admixture Analysis

Background:

  • Latin America's population results from extensive historical admixture between European, African, and Native American ancestries.
  • This demographic history, beginning in 1492, has created one of the world's largest recently admixed populations.
  • Understanding this admixture is crucial for human genetic research.

Observation:

  • Genetic analyses are key to examining the demographic history of Latin American populations.
  • These analyses investigate mating patterns, population structure, and detailed ancestry.
  • The region's genetic diversity provides a unique natural experiment.

Findings:

  • Recent genetic analyses in Latin Americans are illuminating the genetic architecture of complex human traits.
  • Admixture patterns reveal intricate details about population movements and interactions.
  • The extensive genetic and phenotypic diversity is a direct outcome of this history.

Implications:

  • Latin American populations are invaluable for genetic association studies.
  • Research in this group enhances our understanding of the genetic basis of diseases and traits.
  • This work contributes to a more comprehensive view of human genetic variation and evolution.