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2014-08-05T14:54:20Z

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:Slovak term: [[Slovenský termín]]
# Microscopy unicellular organisms having a rigid cell wall. They lack a nuclear membrance, a mitotic system, and mitochondria; possess only a single piece of chromosomal deoxyribonucleic acid; and divide by binary fission. Most are nonphotosynthetic; photosynthetic forms do not contain plant-type chlorophyll (Symons et al 2000).
# A large group of unicellular, prokaryotic microorganisms, in other words, they consist in one cell, have no separate nucleus with genetic material and their size is typically a few micrometers (WHO 2009).
# See also : [[Infectious disease|infectious diseases]]

==Explanation==
The term bacteria was coined in the 19th century by the German botanist Ferdinand Cohn
(1828-98) who based it on the Greek bakterion meaning a small rod. In 1853, Cohn
categorized bacteria as one of three types of microorganisms -- bacteria (short rods), bacilli
(longer rods), and spirilla (spiral forms) (WHO 2009).

==Example==
If bacteria form a parasitic association with other organisms, they are classified as
pathogens. Pathogenic bacteria are a major cause of human death and disease and cause
infections such as diarrhoea1 disease, tetanus, typhoid fever, diphtheria, syphilis, cholera,
foodborne illness, leprosy and tuberculosis (WHO 2009).

==References==
* WHO (2009) Health impact assessment glossary: E-learning modules
* Symons JM, Bradley LC and Cleveland TC (2000) The drinking water dictionary, American Water Works Association

==Links==
* [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]

[[Category:EN]]

Bacteria - História úprav

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