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Related Concept Videos

Areas Within Irregular Boundaries01:26

Areas Within Irregular Boundaries

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Calculating areas within irregular boundaries, such as along rivers or curved roads, is crucial in various fields, including surveying, engineering, and environmental management. Surveyors often begin by creating a traverse, a connected series of straight lines approximating the area's boundary. The coordinates of each traverse point are essential for calculating the enclosed area. The double meridian distance formula is a widely used technique for this purpose. This method utilizes the...
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The Menstrual Cycle01:19

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The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
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The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
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Oogenesis02:07

Oogenesis

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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Additional Subnuclear Structures

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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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Nonsense-mediated mRNA Decay02:27

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Related Experiment Video

Updated: Feb 15, 2026

Using Wavelet Entropy to Demonstrate how Mindfulness Practice Increases Coordination between Irregular Cerebral and Cardiac Activities
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Menstrual Irregularities.

Christy Foster, Hiba Al-Zubeidi

    Pediatric Annals
    |January 12, 2018
    PubMed
    Summary

    Adolescent irregular menstrual cycles have many causes. A stepwise approach using medical history and physical exams is key for diagnosis and management of these common gynecological issues.

    Area of Science:

    • Pediatric Gynecology
    • Adolescent Medicine

    Background:

    • Irregular menstrual cycles are a frequent concern in adolescent females.
    • Multiple underlying causes contribute to menstrual irregularities.

    Purpose of the Study:

    • To outline a systematic approach for evaluating adolescent menstrual irregularities.
    • To discuss differential diagnoses, evaluation, and management strategies.

    Main Methods:

    • Review of common conditions causing irregular menses in adolescents.
    • Emphasis on thorough medical history and physical examination.
    • Understanding menstrual cycle characteristics for etiological determination.

    Main Results:

    • Irregular menstrual cycles in adolescents necessitate a structured diagnostic process.

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  • Differential diagnosis involves considering various common gynecological conditions.
  • Effective management hinges on accurate etiological identification.

    • Conclusions:

    • A stepwise evaluation is crucial for addressing adolescent menstrual irregularities.
    • Understanding the nuances of the menstrual cycle aids in diagnosis.
    • This approach facilitates appropriate management of common conditions.