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Consequently, the need to identify human pathogens was a major impetus for the development of techniques to identify bacteria. [ 175 ] The Gram stain , developed in 1884 by Hans Christian Gram , characterises bacteria based on the structural characteristics of their cell walls.
In microbiology, the term isolation refers to the separation of a strain from a natural, mixed population of living microbes, as present in the environment, for example in water or soil, or from living beings with skin flora, oral flora or gut flora, in order to identify the microbe(s) of interest. [1]
Coryneform bacteria are members of the family Corynebacteriaceae; Fruiting gliding bacteria or myxobacteria are members of the phylum Myxococcota; Enterics are members of the order Enterobacteriales (although the term is avoided if they do not live in the intestines, such as Pectobacterium) Acetic acid bacteria are members of the family ...
Gram-indeterminate bacteria do not respond predictably to Gram staining and, therefore, cannot be determined as either gram-positive or gram-negative. Examples include many species of Mycobacterium , including Mycobacterium bovis , Mycobacterium leprae and Mycobacterium tuberculosis , the latter two of which are the causative agents of leprosy ...
Spiral bacteria are another major bacterial cell morphology. [2] [30] [31] [32] Spiral bacteria can be sub-classified as spirilla, spirochetes, or vibrios based on the number of twists per cell, cell thickness, cell flexibility, and motility. [33] Bacteria are known to evolve specific traits to survive in their ideal environment. [34]
It is described using terms like brittle, creamy, sticky and dry. Staphylococci are considered to have a creamy consistency, [1]: 173 while some Neisseria species are sticky, and colonies of diphtheroid bacteria and beta-hemolytic streptococci are typically dry. [1]: 167–8 Bacteria that produce capsules often have a slimy (mucoid) consistency.
Bacteriology is the study of bacteria and their relation to medicine. Bacteriology evolved from physicians needing to apply the germ theory to address the concerns relating to disease spreading in hospitals the 19th century. [5] Identification and characterizing of bacteria being associated to diseases led to advances in pathogenic bacteriology.
The manual was published subsequent to Bergey's Manual of Determinative Bacteriology, though the latter is still published as a guide for identifying unknown bacteria. [1] First published in 1923 by David Hendricks Bergey , it is used to classify bacteria based on their structural and functional attributes by arranging them into specific ...
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