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Related Concept Videos

Competition02:34

Competition

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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.
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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.
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

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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.
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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.
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Ecological Niches02:02

Ecological Niches

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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.
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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.
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Competitive Transplants to Evaluate Hematopoietic Stem Cell Fitness
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Insights into the Competition between K

Ze Yu1, Wei Zhou1, Ge Ma1

  • 1College of Chemistry , Beijing Normal University , Beijing 100875 , P. R. China.

The Journal of Physical Chemistry. B
|September 15, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals how potassium (K+) and lead (Pb2+) ions compete for binding to G-quadruplex DNA structures. A novel intermediate ion complex was discovered, facilitating ion exchange and influencing G-quadruplex DNA stability.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Cation-dependent stability and topological changes of G-quadruplexes (G4s) are well-documented.
  • The competitive binding of multiple cations and their impact on G4 polymorphism remain underexplored, limiting G4 applications.

Purpose of the Study:

  • To investigate the competitive binding between potassium (K+) and lead (Pb2+) ions for G-quadruplex DNA.
  • To elucidate the effects of cation competition on G4 structure and stability using PW17 as a model.

Main Methods:

  • Circular dichroism (CD) spectroscopy to monitor structural changes.
  • Electrospray ionization mass spectrometry (ESI-MS) to identify bound cations and complexes.
  • Thermodynamic analysis of cation-induced conformational changes.

Main Results:

  • 10 μM Pb2+ can displace K+ from K+-stabilized PW17, with efficiency dependent on K+ concentration (0.5-10 mM).
  • K+ (<10 mM) partially displaces Pb2+ from Pb2+-stabilized PW17, while complete substitution occurs at K+ ≥10 mM.
  • A novel intermediate, K+-Pb2+-PW17, was identified, acting as a bridge during ion exchange.
  • Competitive binding is thermodynamically permitted.

Conclusions:

  • The study clarifies the intricate competition between K+ and Pb2+ for G-quadruplex binding.
  • The discovery of the K+-Pb2+-PW17 intermediate provides new insights into G4 structural dynamics and ion-mediated switching.
  • Understanding these competitive interactions is crucial for advancing G4-based applications.