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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Passive Diffusion: Overview and Kinetics01:17

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Assessment of Diffusion and Perfusion01:17

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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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[The knowledge diffusion as an educational tool].

Manuel Ramiro-H1

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|March 15, 2014
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Summary

This study proposes new metrics beyond the impact factor to evaluate scientific journals. We suggest considering circulation, readership, print runs, and internet access for a comprehensive journal assessment.

Keywords:
Impact factorInternetOnline systemsPeriodicals

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Area of Science:

  • Bibliometrics
  • Scholarly Communication
  • Journal Evaluation

Background:

  • Periodicals are key for knowledge dissemination.
  • The impact factor has been the primary metric for journal and researcher evaluation since the 1960s.
  • Limitations of the impact factor in fully representing journal importance exist.

Purpose of the Study:

  • To propose a more comprehensive evaluation of scientific journals.
  • To introduce metrics beyond the traditional impact factor.
  • To assess journal importance using diverse indicators.

Main Methods:

  • Analysis of journal circulation data.
  • Evaluation of readership size.
  • Assessment of print run statistics.
  • Examination of internet access and online presence.

Main Results:

  • Journal circulation and readership size correlate with perceived importance.
  • Print runs and internet access provide additional dimensions to journal value.
  • A multi-metric approach offers a richer understanding of journal influence.

Conclusions:

  • Journal evaluation should incorporate metrics beyond the impact factor.
  • Circulation, readership, print runs, and internet access are valuable indicators.
  • A holistic approach enhances the assessment of scientific periodicals.