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Related Concept Videos

Types of RNA01:23

Types of RNA

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Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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Types of Hormones02:13

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Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.
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Types of Selection01:46

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Types of Skewness01:09

Types of Skewness

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If the frequency distribution of a data set is more inclined towards smaller or larger values, the distribution is said to be skewed. If data values are skewed to the right, then the distribution is called positively skewed. Conversely, if the plot is skewed to the left, the distribution is called negatively skewed.
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Types of Damping01:20

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If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Related Experiment Video

Updated: Feb 3, 2026

Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Conjoined twins-thoraco-omphalopagus (type A).

Omar Muayad Sultan, Ahmed Said Tawfeek

    BJR Case Reports
    |October 27, 2018
    PubMed
    Summary

    Routine ultrasound revealed conjoined twins joined at the chest and abdomen with a single functional heart. The pregnancy was terminated at 19 weeks gestation.

    Area of Science:

    • Perinatology
    • Medical Imaging
    • Genetics

    Background:

    • Conjoined twinning is a rare occurrence, presenting unique diagnostic and management challenges.
    • Early detection through prenatal screening is crucial for informed decision-making.

    Observation:

    • A 19-year-old multigravid female underwent routine transabdominal ultrasound at 16 weeks gestation.
    • The ultrasound identified conjoined twins, classified as omphalopagus (joined at the abdomen) and thoracopagus (joined at the chest).

    Findings:

    • The conjoined twins shared significant anatomical structures, including a single functional heart.
    • Detailed imaging confirmed the extent of fusion and shared vital organs.

    Implications:

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  • This case highlights the importance of detailed ultrasound in diagnosing complex congenital anomalies.
  • Management decisions, including pregnancy termination, require careful consideration of fetal anatomy and parental counseling.