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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Allosteric Regulation01:08

Allosteric Regulation

Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
Regulation of Metabolism01:19

Regulation of Metabolism

Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
Regulation of the Cardiovascular System01:27

Regulation of the Cardiovascular System

The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...

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Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
07:12

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry

Published on: January 19, 2020

Supramolecular autoregulation.

Francisco Rodríguez-Llansola1, E W Meijer

  • 1Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.

Journal of the American Chemical Society
|April 4, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel supramolecular system that maintains constant enzyme activity regardless of concentration. This autoregulated catalytic system uses specifically designed inhibitors to achieve concentration independence.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Area of Science:

  • Biochemistry
  • Supramolecular Chemistry
  • Chemical Biology

Background:

  • Enzyme activity is crucial in biological systems and often regulated by sensitivity to enzyme or substrate concentration.
  • Existing control mechanisms can alter catalytic properties based on concentration differences.

Purpose of the Study:

  • To report the first supramolecular system exhibiting concentration-independent catalytic activity.
  • To introduce newly designed inhibitor molecules for achieving this autoregulation.

Main Methods:

  • Design and synthesis of novel inhibitor molecules.
  • Construction of a supramolecular system involving coupled equilibriums.
  • Characterization of the system's catalytic activity across a broad concentration range.

Main Results:

  • Demonstrated a supramolecular system where catalytic activity is independent of concentration.
  • Achieved a stable free catalyst concentration of 1 mM over a wide range.
  • Utilized inhibitor molecules to create an autoregulated catalytic system.

Conclusions:

  • The developed supramolecular system offers a novel approach to control enzyme activity.
  • Concentration independence of catalytic activity is achievable through precisely designed molecular systems.
  • This autoregulated system has potential applications in various chemical and biological contexts.