Video Experimental Relacionado
Updated: Jan 17, 2026
01:32
Assembly of Complex Microtubule Structures
2.4K
Flujo molecular episódico en el muy joven cúmulo protostellar Serpens Sur
Adele L Plunkett1, Héctor G Arce1, Diego Mardones2
1Astronomy Department, Yale University, New Haven, Connecticut 06511, USA.
Nature
|November 6, 2015
Resumen
Las salidas protoestelares exhiben eventos de eyección de masa episódica, incluso en las primeras etapas de la formación estelar dentro de cúmulos densos. Esto proporciona una turbulencia crucial para regular la formación de estrellas en estos entornos.
Área de la Ciencia:
- * Astronomía y astrofísica
- * Formación y evolución de las estrellas
- * Los chorros y salidas protostellares
Sus antecedentes:
- * La acumulación de masa protostellar se acompaña de pérdida de masa a través de chorros o salidas.
- * Se observan eventos de eyección episódica en las fases protostellares de Clase 0 y Clase I.
- * El comportamiento de las salidas en densos cúmulos de formación estelar no se entiende bien.
Objetivo del estudio:
- * Investigar la naturaleza de las salidas impulsadas por la acreción de las protoestrellas jóvenes en un entorno agrupado.
- * Para determinar si los eventos de eyección episódica ocurren en las primeras etapas de la evolución protostellar dentro de los cúmulos.
- * Comprender el papel de los flujos de salida en la transferencia de impulso y energía en cúmulos protoestelares.
Principales métodos:
- * Observación de una joven protoestrella de clase 0 en el centro del cúmulo protostellar Serpens Sur.
- * Análisis de la emisión (12) C(16) O (J=2-1) para identificar las características de las expulsiones de flujo.
- * Examen de las emisiones de la envolvente de CO2 para estudiar la cinemática de la caída y la rotación.
Principales resultados:
- * Se encontraron pruebas inequívocas de eventos de eyección de flujo episódico de la protoestrella.
- * Se detectaron veintidós características de eyección de salida distintas, con la más reciente mostrando la velocidad más alta.
- * El flujo de salida forma lóbulos bipolares que se originan en el pico de emisión del continuo de 1 mm, y la envoltura circundante muestra la caída y la rotación.
Conclusiones:
- * El flujo episódico, impulsado por la acreción, comienza en las primeras fases de la evolución protostellar.
- * Los flujos de salida protoestelares pueden permanecer intactos y funcionar dentro de entornos densos y agrupados.
- * Es probable que estos flujos de salida desempeñen un papel importante en la conducción de la turbulencia a través de una transferencia de impulso eficiente en los grupos.
Videos de Conceptos Relacionados
01:32Assembly of Complex Microtubule Structures
2.4K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
2.4K
02:50Spindle Assembly
4.2K
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
4.2K
01:13Centrioles and Centrosomes
5.4K
Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
Near the end of the prophase, also called late prophase or...
5.4K
01:23Microtubule Formation
7.4K
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
7.4K
01:24Microtubules in Cell Motility
4.5K
Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
4.5K
01:32Microtubule Associated Motor Proteins
10.3K
Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
10.3K