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Related Concept Videos

Dissociative Disorders01:27

Dissociative Disorders

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Dissociative disorders represent complex psychological conditions characterized by disruptions in consciousness, memory, identity, or perception. These disruptions cause individuals to experience a disconnection from their thoughts, emotions, and memories. The phenomenon is not merely an occasional lapse in attention but a profound alteration in mental functioning that can severely impact daily life.
Dissociative Fugue
A hallmark feature of dissociative disorders is the dissociative fugue...
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Dissociative Amnesia01:21

Dissociative Amnesia

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Dissociative amnesia is a complex psychological condition that manifests as an inability to recall personal information, often tied to traumatic or stressful events. Unlike general amnesia, individuals with this condition retain the ability to perform routine activities and procedural tasks, such as operating a phone or navigating public transportation, yet experience profound gaps in autobiographical memory. These lapses may encompass significant life events, such as suicide attempts or...
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Dissociative Identity Disorder01:30

Dissociative Identity Disorder

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Dissociative Identity Disorder (DID), previously termed multiple personality disorder, is a complex psychological condition characterized by the presence of two or more distinct identities or personality states. Each identity exhibits unique patterns of behavior, voice, and mannerisms and may possess separate memories and emotional responses. The alternating control between identities can result in memory gaps and challenges in recalling daily activities, often exacerbating the individual's...
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Bond Dissociation Energy and Activation Energy02:13

Bond Dissociation Energy and Activation Energy

11.3K
Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as bond dissociation energies when given for specific bonds or average bond energies when indicated for a given type of bond over many compounds. Firstly, the bond dissociation energy for a single bond is weaker than that of a double bond, which in turn is weaker than that of a triple bond. Secondly, hydrogen forms relatively strong bonds with...
11.3K
Acid/Base Strengths and Dissociation Constants03:02

Acid/Base Strengths and Dissociation Constants

70.2K
The relative strength of an acid or base is the extent to which it ionizes when dissolved in water. If the ionization reaction is essentially complete, the acid or base is termed strong; if relatively little ionization occurs, the acid or base is weak. There are many more weak acids and bases than strong ones. The most common strong acids and bases are listed below:
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Mixtures of Acids03:27

Mixtures of Acids

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The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
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Related Experiment Video

Updated: Feb 13, 2026

Isolation and Culture of Dissociated Sensory Neurons From Chick Embryos
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Scapholunate Dissociation.

Andrew Tomas

    The Journal of Orthopaedic and Sports Physical Therapy
    |March 2, 2018
    PubMed
    Summary

    A fall into a push-up position can cause wrist injuries. Radiographs revealed a widened scapholunate gap and angle, indicating scapholunate dissociation, a common wrist ligament injury.

    Area of Science:

    • Orthopedics
    • Sports Medicine
    • Physical Therapy

    Background:

    • Wrist injuries are common, particularly after falls.
    • Scapholunate dissociation is a significant wrist ligament injury that can result from trauma.

    Observation:

    • A 52-year-old male presented with right wrist pain after a fall onto an outstretched hand in a push-up position.
    • Physical therapy evaluation was initiated 24 hours post-injury.
    • Radiographic examination followed American College of Radiology guidelines.

    Findings:

    • Radiographs revealed a widened scapholunate gap (4 mm) and an increased scapholunate angle (>60°).
    • These findings are indicative of scapholunate dissociation.
    • The injury pattern suggests a potential ligamentous tear between the scaphoid and lunate bones.
    Keywords:
    radiographyscaphoidupper extremitywrist

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    Implications:

    • Early identification of scapholunate dissociation through physical examination and radiography is essential.
    • Prompt diagnosis can guide appropriate treatment strategies, potentially involving conservative or surgical interventions.
    • Understanding injury mechanisms like falls into push-up positions aids in injury prevention and patient education.