Video Experimental Relacionado
Updated: Jul 11, 2026
07:59
A Strain Gauge Monitor (SGM) for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
Published on: August 1, 2018
Aguas subterráneas profundas oxigenadas: ¿anomalía o ocurrencia común?
Science (New York, N.Y.)
|June 11, 1982
Resumen
Las aguas subterráneas profundas, de miles de años de antigüedad, sorprendentemente retienen un significativo oxígeno disuelto, lo que desafía las suposiciones sobre el agotamiento del oxígeno en los acuíferos. Este hallazgo tiene un impacto en la comprensión de la química de las aguas subterráneas profundas.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La hidrogeología es la hidrogeología.
- Ciencias del medio ambiente Ciencias del medio ambiente.
Sus antecedentes:
- La noción científica prevaleciente sugiere que las reacciones que agotan el oxígeno en el suelo y los acuíferos agotan rápidamente el oxígeno disuelto en el agua de recarga.
- Se supone que este proceso reduce el oxígeno disuelto a niveles indetectables en sistemas de aguas subterráneas profundas.
Objetivo del estudio:
- Para investigar la presencia y concentración de oxígeno disuelto en aguas subterráneas profundas.
- Desafiar la comprensión establecida del agotamiento del oxígeno en los antiguos sistemas acuíferos.
Principales métodos:
- Muestreo de aguas subterráneas de acuíferos profundos (100-1000 metros) en diversas ubicaciones geológicas.
- Análisis del contenido de oxígeno disuelto en muestras de agua de Nevada, Arizona, los Apalaches y Arkansas.
Principales resultados:
- Se detectaron concentraciones de oxígeno disuelto que oscilaban entre 2 y 8 miligramos por litro en aguas profundas del acuífero.
- Las aguas muestreadas eran geológicamente antiguas, con edades que abarcan desde varios miles hasta más de 10.000 años.
- Algunas muestras de agua se originaron en puntos de recarga a más de 80 kilómetros de distancia de los sitios de muestreo.
Conclusiones:
- Las aguas subterráneas profundas y antiguas pueden retener niveles significativos de oxígeno disuelto, contrariamente a creencias anteriores.
- Es posible que las reacciones que agotan el oxígeno no sean tan rápidas o completas en todos los ambientes acuíferos profundos como se suponía anteriormente.
- Este descubrimiento tiene implicaciones para la comprensión de los procesos biogeoquímicos del subsuelo y la gestión de los recursos hídricos.
Videos de Conceptos Relacionados
01:30Alterations in Respiration II
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
01:23Hypoxia
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
01:29Disorder of Water Balance
Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
01:19Quality of Water
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...