Video Experimental Relacionado
Updated: Jun 27, 2026

10:53
Stereotaxic Surgery for Implantation of Microelectrode Arrays in the Common Marmoset (Callithrix jacchus)
Published on: September 29, 2019
Un mastodonte de El Jobo fue asesinado en Taima-taima, Venezuela
Resumen
Los artefactos del complejo de El Jobo fueron encontrados con un esqueleto juvenil de mastodonte en Taima-taima. La datación por radiocarbono sugiere que la matanza ocurrió hace al menos 13.000 años, antes del complejo Clovis de América del Norte.
Área de la Ciencia:
- Arqueología Arqueología.
- Paleontología Paleontología.
- La Prehistoria de América del Sur La Prehistoria de América del Sur La Prehistoria de América del Sur La prehistoria de América del Sur La prehistoria de América del Sur La prehistoria de América del Sur La prehistoria de América del Sur
Sus antecedentes:
- El complejo de El Jobo representa la presencia humana temprana en América del Sur.
- La datación de los primeros asentamientos humanos es crucial para comprender los patrones de migración.
- El sitio de Taima-taima proporciona evidencia de la actividad humana prehistórica.
Objetivo del estudio:
- Hasta la fecha los artefactos del complejo de El Jobo encontrados en Taima-taima.
- Para establecer la relación cronológica entre el complejo de El Jobo y otras culturas prehistóricas.
- Investigar los orígenes y el desarrollo de las primeras culturas sudamericanas.
Principales métodos:
- Excavación del yacimiento Taima-taima.
- Análisis de artefactos del complejo de El Jobo.
- La datación por radiocarbono de ramas de madera asociadas con restos faunísticos.
Principales resultados:
- Los artefactos del complejo de El Jobo fueron descubiertos en asociación directa con los restos de mastodontes masacrados.
- La datación por radiocarbono de ramas de madera asociadas dio una edad mínima de 13.000 años antes del presente para la matanza del mastodonte.
- Esta datación coloca el complejo de El Jobo significativamente antes que el complejo de Clovis en América del Norte.
Conclusiones:
- El complejo de El Jobo es más antiguo de lo que se pensaba.
- Los hallazgos sugieren que el complejo de El Jobo evolucionó de forma independiente en el norte de América del Sur.
- Esta investigación proporciona datos críticos sobre la antigüedad de los asentamientos humanos en América del Sur.
Videos de Conceptos Relacionados
Robbers Cave
During the 1950s, the landmark Robbers Cave experiment demonstrated that when groups must compete with one another, intergroup conflict, hostility, and even violence may result. At the Oklahoman summer camp, two troops of boys—termed the Rattlers and the Eagles—took part in a week-long tournament. During this time, their negativity culminated in derogatory name-calling, fistfights, and even vandalism and destruction of property. However, this work also revealed that such tension could be...
The Fossil Record
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
Necrosis
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Rab Cascades
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Veins of Thorax
The azygos system is a crucial part of the body's circulatory system and drains most of the thorax. It comprises the azygos, hemiazygos, and accessory hemiazygos veins.
The azygos vein, positioned just right of the midline and anterior to the vertebral column, begins at the junction of the right ascending lumbar and subcostal veins, terminating in the superior vena cava. This vein drains blood from the right side of the thoracic wall, thoracic viscera, and posterior abdominal wall.
The...
The azygos vein, positioned just right of the midline and anterior to the vertebral column, begins at the junction of the right ascending lumbar and subcostal veins, terminating in the superior vena cava. This vein drains blood from the right side of the thoracic wall, thoracic viscera, and posterior abdominal wall.
The...
Acid Mine Drainage
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...

