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Internal Energy02:00

Internal Energy

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The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial.
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The internal energy of a thermodynamic system is the sum of the kinetic and potential energies of all the molecules or entities in the system. The kinetic energy of an individual molecule includes contributions due to its rotation and vibration, as well as its translational energy. The potential energy is associated only with the interactions between one molecule and the other molecules of the system. Neither the system's location nor its motion is of any consequence as far as the internal...
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The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Developing an Assessment Framework for Essential Internal Medicine Subspecialty Topics.

Natasha Chida, Christopher Brown, Jyoti Mathad

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    A new assessment framework for internal medicine residents identified significant knowledge and practice gaps in tuberculosis diagnosis. This tool can improve resident evaluation for less common subspecialty topics.

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    Area of Science:

    • Medical Education
    • Internal Medicine
    • Infectious Diseases

    Background:

    • Direct observation is ideal for assessing infrequently encountered subspecialty topics in residents.
    • However, direct observation presents significant logistical challenges for educators.

    Purpose of the Study:

    • To develop and validate an assessment framework for internal medicine residents in subspecialty topics.
    • To use tuberculosis diagnosis as a proof-of-concept for this novel assessment framework.

    Main Methods:

    • A 4-step process was employed across 8 academic medical centers.
    • This involved creating a knowledge assessment tool, pilot testing, implementation with 886 residents, and retrospective chart review for outcomes.
    • The study evaluated tool score, item performance, and diagnostic test utilization.

    Main Results:

    • The assessment tool demonstrated content validity from 10 infectious disease experts.
    • Pilot testing showed higher scores for fellows versus residents (P < .001), with good reliability (Kuder-Richardson Formula 20 = 0.72).
    • Implementation revealed a mean score of 4.4, a 61% response rate, and low correct response rates for most items (≤57%), alongside suboptimal rates for recommended diagnostic tests (≤43%), except chest x-rays.

    Conclusions:

    • The developed assessment framework effectively identified knowledge and practice gaps in tuberculosis diagnosis among internal medicine residents.
    • This approach offers a scalable solution for assessing residents in infrequently encountered subspecialty areas, moving beyond traditional direct observation limitations.