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Antibiotic Selection00:57

Antibiotic Selection

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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
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Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
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What is Natural Selection?01:32

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Related Experiment Video

Updated: Feb 2, 2026

Synthesis and Evaluation of a Ruthenium-based Mitochondrial Calcium Uptake Inhibitor
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Selective Serotonin Re-uptake Inhibitors: An overview.

Amol Joshi1

  • 1Emmanuel College, University of Cambridge, Cambridge, CB23AP, UK, aj486@cam.ac.uk.

Psychiatria Danubina
|November 16, 2018
PubMed
Summary

Selective serotonin re-uptake inhibitors (SSRIs) are common treatments for major depressive disorder (MDD). This report reviews SSRI efficacy, mechanisms, and side effects, noting underestimation of adverse events.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Psychiatry

Background:

  • Selective serotonin re-uptake inhibitors (SSRIs) are primary treatments for major depressive disorder (MDD).
  • Decades of research show conflicting results regarding SSRI efficacy and their precise therapeutic mechanisms.
  • Despite better tolerability than older antidepressants like TCAs, SSRIs have notable side effects, sometimes persistent.

Purpose of the Study:

  • To review the historical use and efficacy of SSRIs in treating MDD.
  • To explore proposed mechanisms underlying SSRI therapeutic action.
  • To detail the side effect profile of SSRIs, including underreported and persistent adverse events.

Main Methods:

  • Literature review of studies on SSRI efficacy and mechanisms.

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  • Analysis of clinical data regarding SSRI side effect prevalence.
  • Historical overview of SSRI development and usage trends.

    • Main Results:

    • SSRIs are widely used for MDD, but their efficacy and mechanisms remain debated.
    • Side effects of SSRIs are common, often underestimated in clinical practice, and can persist post-treatment.
    • Patient non-compliance may stem from underreported adverse effects.

    Conclusions:

    • A comprehensive understanding of SSRI efficacy and side effects is crucial for effective MDD treatment.
    • Further research is needed to clarify SSRI mechanisms and manage adverse events.
    • Accurate reporting and management of SSRI side effects are essential for patient adherence and outcomes.