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The Integrated Rate Law: The Dependence of Concentration on Time02:39

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While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Related Experiment Video

Updated: Feb 4, 2026

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Curcumin induces concentration-dependent alterations in mitochondrial function through ROS in C2C12 mouse myoblasts.

Tianzheng Yu1, Jacob Dohl1, Falicia Elenberg1

  • 1Department of Military and Emergency Medicine, Consortium for Health and Military Performance, Uniformed Services University of the Health Sciences, Bethesda, Maryland.

Journal of Cellular Physiology
|September 25, 2018
PubMed
Summary
This summary is machine-generated.

Low curcumin concentrations protect cells from oxidative stress by enhancing mitochondrial function and mass. High concentrations induce cell death via apoptosis, highlighting curcumin

Keywords:
antioxidantapoptosiscell viabilitycurcumindiabetesmitochondriamitochondrial permeability transitionmyoblastreactive oxygen species

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Mitochondrial Research

Background:

  • Curcumin's dual role: antioxidant in normal cells, pro-oxidant in tumor cells.
  • Mitochondria are key targets and sources of reactive oxygen species (ROS).
  • Understanding curcumin's concentration-dependent effects on cellular redox and mitochondria is crucial.

Purpose of the Study:

  • To investigate how curcumin concentration influences cellular redox status and mitochondrial function in normal cells.
  • To determine curcumin's effects on C2C12 myoblasts under normal and high glucose conditions.
  • To elucidate the mechanisms underlying curcumin-induced cell death or protection.

Main Methods:

  • Exposure of mouse C2C12 myoblasts to varying curcumin concentrations (1-50 μM).
  • Assessment of reactive oxygen species (ROS) levels, cell viability, and mitochondrial function.
  • Analysis of mitochondrial permeability transition pore opening, cytochrome c release, and caspase activation.

Main Results:

  • High curcumin concentrations (10-50 μM) decreased cell viability and increased ROS, leading to apoptosis.
  • Low curcumin concentrations (1-5 μM) increased mitochondrial mass and membrane potential without affecting viability.
  • Low-dose curcumin (5 μM) protected cells against high glucose-induced oxidative injury.

Conclusions:

  • Curcumin's effect on mitochondria is concentration-dependent, leading to either cell protection or death.
  • Low-dose curcumin shows therapeutic potential for diabetes and mitochondrial diseases by modulating ROS.
  • Curcumin's differential impact on cellular redox status offers a potential therapeutic strategy.