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Related Concept Videos

Determination01:51

Determination

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Determining Order of Reaction02:53

Determining Order of Reaction

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Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
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Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

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The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution.  In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Induced-fit Model01:13

Induced-fit Model

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Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...
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Experimental Determination of Chemical Formula02:37

Experimental Determination of Chemical Formula

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The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
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Related Experiment Video

Updated: Feb 10, 2026

Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
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[Determinants of induced abortion delay].

Laia Font-Ribera1, Glòria Pérez, Albert Espelt

  • 1Servei de Sistemes d'Informació Sanitària, Agència de Salut Pública de Barcelona, Barcelona, Spain.

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Induced abortion delays until the second trimester are linked to lower education, younger age, and not cohabiting. These factors highlight socioeconomic disparities in abortion access.

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Area of Science:

  • Reproductive Health
  • Public Health
  • Sociology

Context:

  • Gestational age significantly influences induced abortion methods, risks, and costs.
  • Understanding delays is crucial for improving reproductive healthcare access.
  • Previous studies indicate varied factors contributing to delayed abortions.

Purpose:

  • To identify determinants of induced abortion delay until the second trimester in Barcelona.
  • To analyze the association between socioeconomic factors and abortion timing.

Summary:

  • A cross-sectional study analyzed 9,175 induced abortions in Barcelona (2004-2005).
  • Second-trimester abortions (7.7%) were more common among women with primary education or less, those under 18, not cohabiting, and in public centers.
  • Low educational level, young age, lack of cohabitation, and public centers were associated with abortion delays.

Impact:

  • The findings reveal significant socioeconomic inequalities in accessing abortion services.
  • Identifies vulnerable populations experiencing delays in reproductive healthcare.
  • Informs policy interventions aimed at reducing disparities in abortion access.