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Related Concept Videos

Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...
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Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Antiprotozoal Agents

Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
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Chemical Agents for Microbial Control

Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
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Anthelminthic Agents

Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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Related Experiment Video

Updated: Jun 23, 2026

Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds
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Published on: August 8, 2025

Quinine is bactericidal.

Saleem Ahmed Kharal1, Qurban Hussain, Shujat Ali

  • 1Department of Microbiology, BMSI, Jinnah Postgraduate Medical Centre (JPMC), Karachi, Pakistan.

JPMA. the Journal of the Pakistan Medical Association
|May 1, 2009
PubMed
Summary
This summary is machine-generated.

Quinine dihydrochloride exhibits significant antibacterial properties against common pathogens like Staphylococcus aureus and E. coli. This finding suggests its potential as a cost-effective antibacterial agent, particularly in developing nations.

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Published on: January 1, 2016

Area of Science:

  • Pharmacology
  • Microbiology
  • Infectious Diseases

Background:

  • Quinine dihydrochloride is primarily known for its antimalarial effects.
  • There is a need for cost-effective antibacterial agents, especially in low-resource settings.

Purpose of the Study:

  • To evaluate the antibacterial efficacy of Quinine dihydrochloride.
  • To determine the Minimum Inhibitory Concentration (MIC) of Quinine dihydrochloride against various bacterial pathogens.

Main Methods:

  • A quasi-experimental study was conducted involving 200 clinical samples (pus, blood, sputum, ascitic fluid).
  • Bacterial isolates were identified, and their susceptibility to Quinine dihydrochloride was tested using standard antimicrobial susceptibility testing methods.

Main Results:

  • Staphylococcus aureus, Escherichia coli, Proteus vulgaris, Pseudomonas aeruginosa, and Salmonella typhi were inhibited at a Minimum Inhibitory Concentration (MIC) of 125 µg/ml.
  • Streptococcus pyogenes demonstrated susceptibility at a lower MIC of 31.25 µg/ml.

Conclusions:

  • Quinine dihydrochloride possesses notable antibacterial activity against a range of clinically relevant bacteria.
  • The dual antimalarial and antibacterial action of Quinine dihydrochloride could offer a cost-effective treatment option in developing countries for patients with mixed infections or limited socioeconomic resources.