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Related Concept Videos

Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing over01:34

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
Healing II: Complications01:24

Healing II: Complications

Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...

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Related Experiment Video

Updated: May 8, 2026

A Graphical User Interface for Software-assisted Tracking of Protein Concentration in Dynamic Cellular Protrusions
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A Graphical User Interface for Software-assisted Tracking of Protein Concentration in Dynamic Cellular Protrusions

Published on: July 11, 2017

A challenging EP tracing.

Ahmed Salah1, Shenghua Zhou, Hui Yang

  • 1Department of Cardiology, The Second Xiangya Hospital of Central South University, Middle Ren-Min Road, No. 139, Changsha, Hunan 410011, China.

Indian Heart Journal
|September 3, 2013
PubMed
Summary
This summary is machine-generated.

This study details a challenging case of narrow QRS complex tachycardia. The patient was diagnosed with an accessory pathway after initial ablation attempts for atrioventricular nodal reentrant tachycardia failed.

Keywords:
AV nodal reentrantAccessory pathwayHigh degree atrioventricular blockProlonged PR interval

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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Arrhythmias

Background:

  • A 69-year-old male presented with a prolonged PR interval and narrow QRS complex tachycardia.
  • Electrophysiological study was performed to investigate the cause of the tachycardia.

Observation:

  • During the electrophysiological study, atrioventricular nodal reentrant tachycardia was initially suspected.
  • An attempted ablation of the slow pathway was unsuccessful in terminating the tachycardia.
  • A high-degree atrioventricular block complicated the diagnostic process.

Findings:

  • Analysis of atrial, His, and ventricular potentials during tachycardia suggested an accessory pathway.
  • The sequence of potentials indicated an accessory pathway connecting the atria and ventricle.

Implications:

  • This case highlights the diagnostic challenges in complex tachycardia scenarios.
  • Accurate interpretation of electrophysiological signals is crucial for identifying accessory pathways.
  • Understanding differential diagnoses is essential for successful arrhythmia management.