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Related Concept Videos

Chemical Formulas02:52

Chemical Formulas

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A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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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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In geometry, measuring the direct distance between two points on a plane is essential in various practical and theoretical applications. Whether in navigation, engineering, or computer graphics, determining the shortest path between two locations involves using the distance formula. This formula is derived from the Pythagorean Theorem, which relates the lengths of the sides of a right triangle. On a coordinate plane, the horizontal and vertical distances between two points serve as the legs of...
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Related Experiment Video

Updated: Jan 22, 2026

Development of a Neonatal Piglet Acute Lung Injury Model Recreating the Early Environment of Preterm Infant Lungs
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Development of a Neonatal Piglet Acute Lung Injury Model Recreating the Early Environment of Preterm Infant Lungs

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Nutrient-enriched formula versus standard formula for preterm infants.

Verena Walsh1, Jennifer Valeska Elli Brown, Lisa M Askie

  • 1Centre for Reviews and Dissemination, University of York, York, UK, Y010 5DD.

The Cochrane Database of Systematic Reviews
|July 18, 2019
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Summary
This summary is machine-generated.

Nutrient-enriched formula for preterm infants shows modest in-hospital growth benefits but no long-term developmental improvements. Evidence certainty is low, requiring cautious interpretation and further research for definitive conclusions on infant nutrition.

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Area of Science:

  • Neonatal Nutrition
  • Pediatric Growth and Development

Background:

  • Preterm infants often experience nutrient deficits, potentially leading to extrauterine growth restriction.
  • Nutrient-enriched formulas may enhance nutrient accretion, growth rates, and neurodevelopmental outcomes in preterm infants.

Purpose of the Study:

  • To compare the effects of nutrient-enriched versus standard formula on the growth and development of preterm infants.

Main Methods:

  • Systematic review and meta-analysis of randomized and quasi-randomized controlled trials.
  • Searched Cochrane CENTRAL, MEDLINE, Embase, CINAHL, and other databases up to November 2018.
  • Extracted data using Cochrane Neonatal methods, assessed trial quality, and synthesized findings using risk ratios and mean differences; certainty of evidence assessed using GRADE.

Main Results:

  • Seven trials involving 590 preterm infants were included; trials were older, industry-funded, and had methodological weaknesses.
  • Low-certainty evidence suggests nutrient-enriched formula increases in-hospital weight gain and head circumference growth but not length gain.
  • Moderate to low-certainty evidence shows no significant effect on long-term growth or neurodevelopmental outcomes, including Bayley scores and cerebral palsy risk.

Conclusions:

  • Nutrient-enriched formulas offer only modest in-hospital growth benefits for preterm infants, with no demonstrated long-term effects on growth or development.
  • The low certainty of the available evidence necessitates cautious interpretation and highlights the need for further randomized trials.
  • Current data do not indicate significant benefits or harms, emphasizing the need for more research to resolve uncertainties regarding enriched formula use in preterm infants.