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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Coordination Compounds and Nomenclature02:54

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Video Experimental Relacionado

Updated: Feb 5, 2026

An Engulfment Assay: A Protocol to Assess Interactions Between CNS Phagocytes and Neurons
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Las neuronas bajo el ataque de células T coordinan el desprendimiento sináptico mediado por fagocitos

Giovanni Di Liberto1, Stanislav Pantelyushin1, Mario Kreutzfeldt1

  • 1Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland.

Cell
|September 4, 2018
PubMed
Resumen

Las neuronas contribuyen activamente a la pérdida sináptica durante la encefalitis de células T CD8 + mediante la activación de la señalización STAT1 y la expresión CCL2, lo que lleva a la enfermedad neurológica. Estas vías también están implicadas en la encefalitis de Rasmussen.

Palabras clave:
Encefalitis de RasmussenCélulas T citotóxicasLa neuroinflamaciónLos fagocitospérdida de sinapsis

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Área de la Ciencia:

  • Neuroinmunología
  • La neurociencia celular

Sus antecedentes:

  • La inflamación del sistema nervioso central (SNC) a menudo implica pérdida sináptica mediada por la microglía y el complemento.
  • Los mecanismos de pérdida sináptica en el daño neuronal impulsado por las células T CD8+ siguen sin estar claros.

Objetivo del estudio:

  • Investigar el papel de la señalización neuronal en la pérdida sináptica mediada por células T CD8+ durante la encefalitis.
  • Para identificar las vías moleculares involucradas en la conectividad sináptica aberrante.

Principales métodos:

  • Perfilamiento del translatoma neuronal en un modelo de ratón de encefalitis de células T CD8+.
  • Análisis de la señalización STAT1 y la expresión CCL2 en las neuronas.
  • Examen del tejido cerebral de los pacientes con encefalitis de Rasmussen.

Principales resultados:

  • La señalización neuronal STAT1 y la expresión de CCL2 fueron críticas para el reclutamiento de fagocitos, la pérdida sináptica y la progresión de la enfermedad en ratones.
  • La fosforilación de STAT1 y la expresión de CCL2 se observaron en las neuronas, las células T CD8+ y los fagocitos en el cerebro de los pacientes con encefalitis de Rasmussen.
  • Las neuronas juegan un papel activo en la orquestación de la pérdida sináptica mediada por fagocitos.

Conclusiones:

  • Las neuronas STAT1 y CCL2 son mediadoras clave de la pérdida sináptica inducida por los fagocitos en la encefalitis de células T CD8+.
  • Estas vías representan objetivos terapéuticos potenciales para la encefalitis autoinmune y trastornos neurológicos relacionados.