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The Structure of Intermediate Filaments

The Structure of Intermediate Filaments

The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm). These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate filaments...

Structures of Solids

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

Transition Zone

Transition Zone

The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...

Intermolecular Forces

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...

Bricks

Bricks

Bricks, a fundamental building material, are crafted from fired clay and exhibit a range of shapes, sizes, and colors. The production process starts with extracting local clay or shale, which is then crushed, ground, and screened for a fine texture. The refined material is blended with water, creating a pliable mixture that can be formed into bricks using one of three processes: soft mud, dry press, or stiff mud methods.
Soft mud bricks are shaped in molds with high moisture content and can be...

Formation of Intermediate Filaments

Formation of Intermediate Filaments

Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.

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Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

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Las arcillas interestratificadas como partículas fundamentales.

P H Nadeau, M J Wilson, W J McHardy

Science (New York, N.Y.)

|August 31, 1984

Resumen

Los minerales de arcilla interestratificados comunes son agregados de partículas fundamentales. Un nuevo modelo explica sus patrones de difracción de rayos X a través de la difracción entre partículas, utilizando sólo tres tipos de partículas.

Área de la Ciencia:

La mineralogía es la Mineralogía.
Ciencia de los materiales Ciencia de los materiales.
La geoquímica es la geoquímica.

Sus antecedentes:

Los minerales de arcilla interestratificados son materiales complejos con estructuras variadas.
Comprender su composición fundamental es crucial para aplicaciones geológicas y de ciencias de los materiales.

Objetivo del estudio:

Proponer un nuevo modelo para los minerales arcillosos interestratificados.
Para explicar sus características de difracción de rayos X basadas en agregados de partículas fundamentales.

Principales métodos:

Se utilizó la microscopía electrónica de transmisión (TEM) para analizar la estructura de las partículas.
Se empleó la difracción de rayos X (XRD) para estudiar los patrones de difracción.

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El modelado experimental utilizó un conjunto limitado de tipos de partículas fundamentales.

Principales resultados:

Los minerales arcillosos interestratificados están compuestos por agregados de partículas fundamentales.
Se puede modelar una amplia gama de patrones de interstratificación utilizando solo tres tipos fundamentales de partículas.
Los patrones de difracción de rayos X surgen de la difracción entre partículas dentro de estos agregados.

Conclusiones:

Un modelo novedoso ve los minerales de arcilla interestratificados como poblaciones de partículas fundamentales.
Este modelo explica con éxito las características de difracción de rayos X observadas.
Los hallazgos simplifican la comprensión de las complejas estructuras minerales de arcilla.