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Videos de Conceptos Relacionados

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Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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Fineness of Cement01:15

Fineness of Cement

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The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
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Filtration00:53

Filtration

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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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The Contractile Ring02:15

The Contractile Ring

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Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
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Capillary Beds01:20

Capillary Beds

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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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Accuracy, limits, and approximation01:28

Accuracy, limits, and approximation

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Accuracy, limits, and approximations are common in many fields, especially in engineering calculations. These concepts are imperative for ensuring that a given value is as close as possible to its true value.
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
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La nueva imagen de la ciencia

Beth Rakouskas1, H Holden Thorp2

  • 1Beth Rakouskas, Creative Director, Science journals.

Science (New York, N.Y.)
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Resumen

La revista Science está siendo rediseñada después de 11 años. Esta actualización aborda los cambios en la comunicación de contenido, la participación del lector y los métodos de producción para la revista científica.

Área de la Ciencia:

  • Comunicaciones científicas
  • Publicaciones en revistas
  • Medios digitales

Sus antecedentes:

  • El panorama científico ha evolucionado significativamente en la última década.
  • El compromiso del lector con el contenido científico ha cambiado con los avances tecnológicos.
  • Se han modernizado los procesos de producción de las revistas científicas.

Objetivo del estudio:

  • Para anunciar y detallar el próximo rediseño de la revista Science.
  • Resaltar las áreas clave de cambio en la comunicación, el compromiso y la producción.
  • Informar a las partes interesadas sobre la evolución estratégica de la revista.

Principales métodos:

  • Análisis de las estrategias de comunicación actuales.
  • Revisión de las métricas y tendencias de participación de los lectores.

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  • Evaluación de los flujos de trabajo de producción interna.

    • Principales resultados:

    • Identificó la necesidad de un rediseño integral para alinearse con la comunicación científica moderna.
    • Cambios reconocidos en la forma en que se difunde y consume la información científica.
    • Reconocidos avances en las tecnologías de producción de revistas.

    Conclusiones:

    • El rediseño tiene como objetivo mejorar la difusión y la accesibilidad de la investigación científica.
    • La adaptación a los nuevos paradigmas de comunicación y participación es crucial para las revistas científicas.
    • Los métodos de producción actualizados mejorarán la eficiencia y el impacto.