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Related Concept Videos

Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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Fermentation01:29

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Most eukaryotic organisms require oxygen to survive and function adequately. Such organisms produce large amounts of energy during aerobic respiration by metabolizing glucose and oxygen into carbon dioxide and water. However, most eukaryotes can generate some energy in the absence of oxygen by anaerobic metabolism.
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Overview
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Updated: Jan 3, 2026

Mapping Metabolism: Monitoring Lactate Dehydrogenase Activity Directly in Tissue
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Lactate: Where Are We Now?

Jan Bakker1, Radu Postelnicu2, Vikramjit Mukherjee2

  • 1Division of Pulmonary Critical Care, and Sleep Medicine, New York University School of Medicine, Bellevue Hospital, 462 First Avenue | NBV-10W18, New York, NY 10016, USA; Department of Pulmonology and Critical Care, Columbia University Medical Center, New York, NY, USA; Department Intensive Care Adults, Erasmus MC University Medical Center, Rotterdam, Netherlands; Department of Intensive Care, Pontificia Universidad Católica de Chile, Santiago, Chile.

Critical Care Clinics
|November 18, 2019
PubMed
Summary
This summary is machine-generated.

Lactate levels correlate with mortality and tissue hypoxia but are complex to interpret in sepsis. Combining lactate with other hypoperfusion markers offers a better approach to guide resuscitation.

Keywords:
Early goal directed therapyHemodynamicsSepsisShockTissue perfusion

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Area of Science:

  • Critical care medicine
  • Biochemistry

Background:

  • Lactate levels are closely linked to morbidity, mortality, and tissue hypoperfusion in shock.
  • Elevated lactate is a key indicator guiding resuscitation efforts in critically ill patients.

Purpose of the Study:

  • To evaluate the complexity of lactate use in guiding resuscitation, particularly in sepsis.
  • To propose an integrated approach using lactate and other tissue hypoperfusion markers.

Main Methods:

  • Analysis of clinical studies and shock models.
  • Review of lactate metabolism and clearance in sepsis.

Main Results:

  • Lactate's relationship with mortality and hypoxia is established.
  • Lactate metabolism and clearance in sepsis present complexities beyond simple interpretation.
  • Integrating multiple markers enhances the framework for resuscitation guidance.

Conclusions:

  • While lactate is central to resuscitation, its interpretation requires caution due to metabolic complexities, especially in sepsis.
  • A combined approach using lactate and other tissue hypoperfusion indicators provides a more robust strategy for initial resuscitation.