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Related Concept Videos

Competition02:34

Competition

24.3K
When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
24.3K
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics01:11

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

777
All neuromuscular blocking agents are injected intravenously because they are poorly absorbed from the GI tract. Rapid onset is achieved with intravenous administration, although absorption is also adequate from an intramuscular injection. Since these agents are highly ionized, they do not readily penetrate cell membranes or cross the blood-brain barrier.
Instead, they are transported by the blood to different tissues. Muscles with a greater blood supply (arteries) and blood flow receive more...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action

2.8K
Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
2.8K
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

934
Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
934
Ecological Niches02:02

Ecological Niches

26.1K
All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
26.1K
Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

10.9K
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
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Related Experiment Video

Updated: Jan 22, 2026

Oligopeptide Competition Assay for Phosphorylation Site Determination
09:16

Oligopeptide Competition Assay for Phosphorylation Site Determination

Published on: May 18, 2017

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Chaotic pairwise competition.

Zlatinka I Dimitrova1, Nikolay K Vitanov

  • 1Institute of Solid State Physics G. Nadjakov of Bulgarian Academy of Sciences, Blvd. Tzarigradsko Chaussee 72, Sofia 1784, Bulgaria.

Theoretical Population Biology
|July 1, 2004
PubMed
Summary

This study models multi-population competition using generalized Volterra equations. Non-constant growth rates and competition coefficients can regularize or chaotize population dominance intervals, impacting ecological and political dynamics.

Area of Science:

  • Ecology
  • Mathematical Biology
  • Political Science

Background:

  • Ecological systems often involve complex competition dynamics.
  • Generalized Volterra equations model population interactions.
  • Previous models (May and Leonard) described cyclic pairwise competition.

Purpose of the Study:

  • Investigate competition in systems with at least three populations.
  • Analyze the impact of non-constant growth rates and competition coefficients.
  • Explore chaotic regimes in population evolution.

Main Methods:

  • Utilized generalized Volterra equations with variable parameters.
  • Analyzed chaotic population dynamics.
  • Applied wavelet transform modulus maxima method to time series analysis.

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Comparing the Affinity of GTPase-binding Proteins using Competition Assays
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Pairwise Growth Competition Assay for Determining the Replication Fitness of Human Immunodeficiency Viruses
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Pairwise Growth Competition Assay for Determining the Replication Fitness of Human Immunodeficiency Viruses

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  • Calculated tau(q)-spectrum and Hölder exponent.

    • Main Results:

    • Non-constant competition coefficients can regularize population dominance intervals.
    • Non-constant growth rates can decrease dominance interval length and chaotize their occurrence.
    • Characterized time intervals between population maxima using spectral analysis.

    Conclusions:

    • Variable parameters in ecological models introduce complex dynamics beyond simple cyclic competition.
    • Findings have implications for understanding ecological stability and voter preference shifts.
    • The model provides insights into the regularization and chaotization of population dominance.