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Related Concept Videos

Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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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,...
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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.
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Overliving.

Andrew B Cohen

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    Elderly patients express a desire to cease living due to anticipated disability and loss of independence. Geriatricians frequently encounter this sentiment in their practice.

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    Area of Science:

    • Geriatrics
    • Palliative Care
    • End-of-Life Studies

    Background:

    • A ninety-five-year-old patient expresses a desire to die, anticipating future disability and loss of independence.
    • This sentiment is described as a common experience among elderly patients by a senior geriatrician.

    Purpose of the Study:

    • To identify and understand the specific terminology used by geriatricians to describe elderly patients' desire to cease living.
    • To explore the underlying reasons and psychological state associated with end-of-life wishes in the elderly.

    Main Methods:

    • Qualitative inquiry through patient-physician narrative.
    • Consultation with a senior geriatrician to ascertain professional terminology.

    Main Results:

    • The patient's narrative highlights a rationalization of end-of-life wishes based on anticipated physical decline.
    • The geriatrician's perspective indicates a recognized pattern of such patient sentiments within geriatric practice.

    Conclusions:

    • Anticipated disability and loss of autonomy are significant factors influencing end-of-life wishes in the elderly.
    • There is a need for precise terminology to describe and address these complex end-of-life considerations in geriatric care.