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Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the...
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Soluciones de transporte para un aire más limpio

Frank J Kelly1, Tong Zhu2

  • 1National Institute for Health Research (NIHR), Heath Protection Research Unit in Health Impact of Environmental Hazards, MRC-PHE Centre for Environment and Health, King's College London, London SE1 9NH, UK. frank.kelly@kcl.ac.uk tzhu@pku.edu.cn.

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Resumen

La contaminación del aire urbano por los vehículos es un desafío mundial. La expansión del transporte público es esencial para un transporte urbano eficiente y un aire más limpio, ya que los controles de emisiones por sí solos son insuficientes.

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Área de la Ciencia:

  • Ciencias del medio ambiente
  • Planificación urbana
  • Salud pública

Sus antecedentes:

  • El transporte por carretera es uno de los principales contribuyentes a la contaminación del aire urbano, causando importantes problemas de salud.
  • Las estrategias actuales de control de emisiones en ciudades como Londres y Beijing han demostrado ser insuficientes para gestionar la calidad del aire de manera efectiva.
  • El crecimiento de la población urbana agrava los desafíos de las emisiones del transporte.

Objetivo del estudio:

  • Evaluar la eficacia de las actuales políticas de transporte urbano en el control de la contaminación atmosférica.
  • Identificar soluciones sostenibles para gestionar las emisiones del transporte urbano en medio del crecimiento de las ciudades.
  • Destacar el papel del transporte público en la solución de los problemas de calidad del aire urbano.

Principales métodos:

  • Análisis de las políticas de transporte urbano existentes y su impacto en las concentraciones de contaminantes atmosféricos.
  • Revisión de estudios de casos de las principales ciudades del mundo (Londres, Pekín).
  • Evaluación de la escalabilidad de los vehículos de cero emisiones en entornos urbanos densos.

Principales resultados:

  • Las tasas de congestión y las zonas de bajas emisiones no han controlado adecuadamente los niveles de dióxido de nitrógeno.
  • Las restricciones a la compra y al uso de automóviles en Beijing no han reducido suficientemente las emisiones del transporte.
  • Los vehículos de cero emisiones por sí solos no son una solución integral para las crecientes demandas de transporte urbano.

Conclusiones:

  • La gestión eficaz de la contaminación atmosférica urbana requiere más que controles de las emisiones de los vehículos.
  • La ampliación y mejora de los sistemas de transporte público es fundamental para una movilidad urbana eficiente.
  • La planificación urbana integrada que priorice el transporte público es necesaria para el desarrollo sostenible de las ciudades y la mejora de la calidad del aire.