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What is Metabolism?00:52

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The human body is a powerhouse of energy, with every cell performing numerous functions that require energy. This energy production and consumption is measured by the metabolic rate, which quantifies the total heat generated by all the body's chemical reactions and mechanical work. This measurement helps to determine the rate of kilocalorie (kcal) consumption needed to fuel all ongoing activities.
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Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
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Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
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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...
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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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A Method for Measuring Metabolism in Sorted Subpopulations of Complex Cell Communities Using Stable Isotope Tracing
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Can metabolic traits explain animal community assembly and functioning?

Simon J Brandl1, Jonathan S Lefcheck2, Amanda E Bates3

  • 1Department of Marine Science, The University of Texas at Austin, Marine Science Institute, Port Aransas, TX, 78373, USA.

Biological Reviews of the Cambridge Philosophical Society
|September 2, 2022
PubMed
Summary

Metabolic rate (MR) traits, including resting MR, maximum MR, and aerobic scope, offer a standardized way to quantify animal competition. Integrating these energetic traits improves understanding of animal community assembly and function.

Keywords:
biodiversityfunctional diversitylimiting similaritymetabolic theory of ecologyniche theorytraits

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Area of Science:

  • Ecology
  • Physiology
  • Evolutionary Biology

Background:

  • Traditional animal community ecology often focuses on sympatric, ecologically similar species.
  • Functional traits have improved understanding of community dynamics, but low-resolution and idiosyncratic traits have limitations.
  • An animal's metabolic rate (MR) is crucial, linking ecological niches and fitness by determining energy costs and acquisition.

Approach:

  • Review evidence from organismal physiology to large-scale analyses across the tree of life.
  • Propose that MR traits (resting MR, maximum MR, aerobic scope) can quantify the energetic basis of species coexistence.
  • Highlight that metabolic traits integrate various energy acquisition/allocation proxies into standardized, continuous quantities applicable to all animals.

Key Points:

  • Metabolic traits provide a precise, standardized measure applicable across diverse animal taxa, body plans, and habitats.
  • These traits integrate multiple ecological and life-history variables, offering a more unified view of energetic competition.
  • Studies suggest MR traits can serve as a proxy for the energetic basis of competition in animal communities.

Conclusions:

  • Integrating metabolic traits into animal community ecology offers a more explicit energetic lens, strengthening trait-based approaches.
  • This integration enhances understanding of community assembly, functioning, and eco-evolutionary dynamics.
  • Metabolic traits can improve predictions of animal community responses to environmental change.