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Related Concept Videos

Leaving Groups02:14

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The nature of leaving groups strongly influences the outcome of a nucleophilic substitution reaction.
In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule.  
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Related Experiment Video

Updated: Jan 5, 2026

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
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My Exit.

Henry Bair1

  • 1School of Medicine, Stanford University, CA.

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|October 22, 2019
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Summary
This summary is machine-generated.

An elderly patient with multiple organ failure considers refusing food, fluids, and antibiotics. Her decision reflects personal beliefs and experiences facing medical treatment.

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Area of Science:

  • Medical Ethics
  • Geriatric Medicine
  • Palliative Care

Background:

  • Elderly patients with multiple organ failure face complex treatment decisions.
  • The concept of futile medicalization raises ethical questions in end-of-life care.

Purpose of the Study:

  • To explore the internal deliberations of an elderly patient considering voluntary refusal of medical interventions.
  • To examine the interplay of personal beliefs, life experiences, and end-of-life choices.

Main Methods:

  • A narrative approach from the patient's perspective.
  • Exploration of the patient's thoughts on refusing food, fluid, and antibiotics.

Main Results:

  • The patient's contemplation of treatment refusal is influenced by her values and past experiences.
  • The narrative highlights the patient's struggle with the perceived futility of ongoing medical interventions.

Conclusions:

  • Patient autonomy and personal beliefs are central to end-of-life decision-making.
  • Ethical considerations in geriatric care must respect individual patient values when facing life-sustaining treatments.