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Bacteriology

Bacteriology is a branch or discipline of science that studies different characteristics of bacteria and their association with other organisms or disciplines.

  • Over the years, the discipline of bacteriology has evolved from the microbiological tests performed only by physicians, the application of the germ theory of disease and economic concerns relating to the spoilage of foods and wine to the use of bacteria to simpler forms of laboratory tests and the production of new nutritious food and antibiotics.
  • The study of bacteria began with the discovery of the microscope and was mostly limited to experts and scientists of that time.
  • The initial advances in pathogenic bacteriology began with the identification and characterization of bacteria associated with specific diseases.
  • Nowadays, however, bacteriology is used in various other fields like food, pharmaceuticals, agriculture, and the environment.
  • Significant advances made in bacteriology over the last century have resulted in the development of many useful vaccines like pneumococcal polysaccharide vaccine, diphtheria toxoid as well as antibiotics.
  • At present, most bacterial diseases in humans and their infectious agents have been identified, although significant variants continue to evolve and sometimes emerge.
  • Studies made in bacteriology have also allowed the use of gene recombination technology in bacteria to produce improved bacterial strains that can then be used in various areas.
  • The importance of bacteriology continues to grow throughout the years as many diseases and disorders associated with almost all living beings are caused by bacteria.
  • Studies of non-pathogenic bacteria that exist in a symbiotic relationship with plants and animals are even beneficial to said organisms.
  • The identification and classification of bacteria into different groups have allowed for a convenient way of studying these bacteria and the formation of a separate branch, systemic bacteriology, that deals with taxonomy.
  • Besides, bacteriological studies, subsequently, have also been divided into different areas like soil bacteriology, public-health bacteriology, industrial bacteriology, etc.
  • Bacteriological studies have been the focal point for disease diagnosis and treatment, and their importance continues to grow with the emergence of new bacteria and associated diseases.

Coccobacilli: Characteristics and Common Examples

September 12, 2023 by Prashant Dahal
Coccobacilli

Bacteria are pleomorphic i.e. they show different morphological characters. Based on their shape, bacteria are mainly classified into four main groups viz. coccus (spherical shaped), bacillus (rod-shaped), spirilla or spirochete … Read more

Facultative Anaerobes: Characteristics, Examples, Uses

September 11, 2023 by Prashant Dahal
Facultative Anaerobes

Based on the ability of organisms to survive and grow either in the presence or absence of oxygen, they are generally classified as aerobic and anaerobic organisms. However, a third … Read more

Most Probable Number (MPN) Test for Water Quality

June 13, 2023 by Sagar Aryal, PhD
Water Quality Analysis by Most Probable Number (MPN)

The most probable number (MPN) test is a statistical method test based on the random dispersion of microorganisms per volume in a given sample. Image Source: Microbe Online and Scharlab. … Read more

Clostridium perfringens: Morphology, Characteristics, Infections & Virulence

September 26, 2026June 5, 2023 by Sagar Aryal, PhD
Clostridium perfringens

Habitat of Clostridium perfringens Morphology of Clostridium perfringens Genome Structure Cultural characteristics of Clostridium perfringens Clostridium perfringens on Robertson’s Cooked Meat Broth Clostridium perfringens on Litmus Milk Clostridium perfringens on … Read more

Ideonella sakaiensis: Plastic-Degrading Bacteria, Characteristics & PETase

September 26, 2026May 23, 2023 by Prashant Dahal
Ideonella sakaiensis (plastic-eating bacteria)

Ideonella sakaiensis is a novel bacterial species renowned for its extraordinary capacity to break down and metabolize a popular kind of plastic used in the manufacture of packaging materials, polyethylene … Read more

Enterococcus faecalis: Morphology, Characteristics, Infections & Identification

September 26, 2026May 23, 2023 by Prashant Dahal
Enterococcus faecalis Overview

Enterococcus faecalis is a Gram-positive, catalase-negative, non-motile cocci of the genus Enterococcus in the Enterococcaceae family of the Lactobacillales order in the class Bacilli. Classification of Enterococcus faecalis Formally, ‘Enterococcus … Read more

Serratia marcescens: Morphology, Characteristics, Infections & Identification

September 26, 2026May 13, 2023 by Prashant Dahal
Serratia marcescens

Serratia marcescens is a Gram-negative, motile, non-endospore-forming, rod-shaped, Gammaproteobacteria in the family Yersiniaceae in the Enterobacterales order. S. marcescens was first identified as the culprit of an incidence of polenta … Read more

Morphology of Bacteria- Sizes, Shapes, Arrangements, Examples

May 3, 2023 by Anupama Sapkota
Bacterial Sizes, Shapes and Arrangement with Examples

Bacteria are a type of biological cell that is prokaryotic and unicellular. Due to the lack of a membrane-bound nucleus, these are simpler than other types of living organisms. Although … Read more

Actinobacteria: Characteristics, Classification, Habitat & Importance

September 26, 2026December 26, 2022 by Prashant Dahal
Actinobacteria

Actinobacteria are Gram-positive, aerobic or facultative, spore-forming bacteria belonging to the order Actinomycetales, characterized by high guanine and cytosine (G + C) content (>55 mol %) in DNAs and rod-shape … Read more

Modified Hodge Test (MHT)- Principle, Procedure, Results, Uses

September 28, 2022September 22, 2022 by Prashant Dahal
Modified Hodge Test (MHT)

Modified Hodge Test (MHT) is a phenotypic method for detecting carbapenemase production by isolated pathogens in clinical laboratories. It is a reliable method to confirm that the carbapenem resistance in … Read more

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