Video Experimental Relacionado
Updated: Jul 13, 2026

10:32
Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
Published on: January 9, 2014
El curso temporal del glutamato en la hendidura sináptica
J D Clements1, R A Lester, G Tong
1Vollum Institute, Oregon Health Sciences University, Portland 97201.
Resumen
El curso temporal de la concentración de neurotransmisores en el cerebro sigue siendo desconocido. Este estudio estima el glutamato.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Fisiología Sináptica Fisiología Sináptica
- Neurotransmisión de las neuronas.
Sus antecedentes:
- La concentración y la tasa de eliminación de los neurotransmisores en la hendidura sináptica son cruciales para la función sináptica.
- Sin embargo, el curso de tiempo preciso de la concentración de neurotransmisores en las sinapsis cerebrales no se entiende bien.
Objetivo del estudio:
- Para estimar el curso de tiempo de concentración del glutamato libre en la hendidura sináptica.
- Comprender sus implicaciones para la activación de los receptores postsinápticos y el decaimiento actual.
Principales métodos:
- Análisis cinético de un desplazamiento antagonista competitivo de rápida disociación de los receptores NMDA.
- Medición durante la transmisión sináptica en las sinapsis hipocampales cultivadas.
Principales resultados:
- La concentración de glutamato alcanzó su punto máximo en 1,1 millimolar.
- El glutamato se descompuso con una constante de tiempo de 1,2 milisegundos.
- Esta rápida descomposición sugiere que la disociación del glutamato contribuye a la descomposición de corriente postsináptica mediada por el receptor AMPA.
Conclusiones:
- El curso de tiempo estimado del glutamato satura los receptores postsinápticos de NMDA.
- La disociación del glutamato de los receptores AMPA tiene un impacto significativo en la descomposición de las corrientes mediadas por los receptores AMPA.
- Esto proporciona información sobre la dinámica de la transmisión sináptica.
Videos de Conceptos Relacionados
What is Glycolysis?
Overview
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
Energy-requiring Steps of Glycolysis
Glucose is the source of nearly all energy used by organisms. The first step of converting glucose into usable energy is called glycolysis. Glycolysis occurs in the cytosol of the cell over two phases: an energy-requiring phase and an energy-releasing phase. Over the first three steps, glucose is converted into different forms and attached to two phosphate groups donated by two ATP molecules, resulting in an unstable sugar. In the next two stages, the unstable sugar splits into two sugar...
Peptide Bonds
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
Glycolysis: Preparatory Phase
In cellular metabolism (the complete breakdown of glucose to extract energy), glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...
ATP Energy Storage and Release
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
One example of energy coupling using ATP involves a...
Acid Halides to Amides: Aminolysis
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...

