Video Experimental Relacionado
Updated: Jul 15, 2026
12:22
Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
Published on: November 9, 2015
Neutropenia entre los sobrevivientes de la explosión de la bomba atómica
Lancet (London, England)
|February 16, 2000
Resumen
Los sobrevivientes de la bomba atómica experimentaron altas tasas de neutropenia. Esta condición fue identificada como derivada de Natural Killer (NK) o NK-como trastornos proliferativos de las células T, confirmados a través de análisis inmunofenotipicos, funcionales y de ADN.
Área de la Ciencia:
- Hematología Hematología.
- Inmunología Inmunología.
- Radioncología Oncología de Radiación.
Sus antecedentes:
- Los sobrevivientes de la bomba atómica exhiben una alta incidencia de neutropenia.
- La neutropenia plantea riesgos significativos para la salud, aumentando la susceptibilidad a las infecciones.
Objetivo del estudio:
- Para investigar las causas subyacentes de la neutropenia observada en los sobrevivientes de la bomba atómica.
- Para identificar los tipos específicos de células inmunes involucradas en la neutropenia inducida por la radiación.
Principales métodos:
- Análisis inmunofenotipico para caracterizar los marcadores de la superficie celular.
- Análisis funcionales para evaluar la actividad de las células inmunes.
- Análisis de ADN para detectar alteraciones genéticas asociadas con trastornos proliferativos.
Principales resultados:
- Se identificó una alta incidencia de neutropenia en la cohorte de sobrevivientes de la bomba atómica.
- La neutropenia fue atribuida a los asesinos naturales (NK) específicos o NK-como trastornos proliferativos de las células T.
- La evidencia diagnóstica fue confirmada a través de una combinación de análisis inmunofenotipicos, funcionales y de ADN.
Conclusiones:
- Los trastornos proliferativos de las células T NK o NK-like son una causa significativa de neutropenia en los sobrevivientes de la bomba atómica.
- Estos hallazgos resaltan las consecuencias inmunológicas a largo plazo de la exposición a la radiación.
- La comprensión de estos mecanismos es crucial para la gestión de los riesgos para la salud en las poblaciones expuestas.
Más Videos Relacionados
Videos de Conceptos Relacionados
03:23Types of Radioactivity
The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
03:18Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...
02:50Nuclear Fission
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
03:20Nuclear Transmutation
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
01:18Other Unique Bacteria
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...