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Related Concept Videos

History of Microbiology01:28

History of Microbiology

Microbiology, a scientific field dedicated to the study of microorganisms, has undergone profound development since its inception in the 17th century. Its history is marked by key discoveries and technological advancements that have shaped our understanding of life at the microscopic level and transformed medicine, agriculture, and industry.Early Foundations of MicrobiologyThe early foundations of microbiology were built on groundbreaking observations and the development of pioneering...
Endospores and Sporulation01:20

Endospores and Sporulation

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...
Production of Antibiotics01:27

Production of Antibiotics

Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
Inhibitors of Gram-positive Cell Wall Synthesis01:23

Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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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Related Experiment Video

Updated: May 24, 2026

Using the Overlay Assay to Qualitatively Measure Bacterial Production of and Sensitivity to Pneumococcal Bacteriocins
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Using the Overlay Assay to Qualitatively Measure Bacterial Production of and Sensitivity to Pneumococcal Bacteriocins

Published on: September 30, 2014

Cephalosporins 1945-1986.

E P Abraham1

  • 1Sir William Dunn School of Pathology, University of Oxford.

Drugs
|January 1, 1987
PubMed
Summary

The discovery of cephalosporin C, a beta-lactam antibiotic resistant to penicillinase, led to the development of numerous cephalosporin drugs. These antibiotics offer low toxicity and broad-spectrum activity against bacterial infections.

Area of Science:

  • Microbiology
  • Medicinal Chemistry
  • Pharmacology

Background:

  • The introduction of penicillin revolutionized medicine, but antibiotic resistance, particularly from penicillinase-producing bacteria like Staphylococci, posed a significant challenge.
  • The isolation of Cephalosporium in Sardinia in 1945 marked the beginning of research into novel antibiotic compounds.
  • Early research identified penicillin N and, inadvertently, cephalosporin C, an antibiotic with a unique beta-lactam structure.

Observation:

  • Cephalosporin C was found to contain a beta-lactam ring but resisted degradation by penicillinase, an enzyme produced by resistant bacteria.
  • The isolation of 7-aminocephalosporanic acid (7-ACA), the nucleus of cephalosporin C, was a pivotal moment.
  • This structural insight enabled the synthesis of a vast array of cephalosporin derivatives.

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Assay Development for High-Throughput Drug Screening Against Mycobacteria
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Assay Development for High-Throughput Drug Screening Against Mycobacteria

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Using the Overlay Assay to Qualitatively Measure Bacterial Production of and Sensitivity to Pneumococcal Bacteriocins
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A Robust Pneumonia Model in Immunocompetent Rodents to Evaluate Antibacterial Efficacy against S. pneumoniae, H. influenzae, K. pneumoniae, P. aeruginosa or A. baumannii

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Assay Development for High-Throughput Drug Screening Against Mycobacteria
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Assay Development for High-Throughput Drug Screening Against Mycobacteria

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Findings:

  • Cephalosporins exhibit broad-spectrum activity against Gram-positive and Gram-negative bacteria.
  • These antibiotics possess very low toxicity, similar to newer penicillins.
  • Cephalosporins have significantly expanded the therapeutic options for treating serious bacterial infections.

Implications:

  • The development of cephalosporins has greatly enhanced chemotherapy options for bacterial infections.
  • Advanced screening methods continue to uncover new beta-lactam antibiotics.
  • Genetic engineering and X-ray crystallography are paving the way for rational drug design and the development of novel antibiotics.