Microbiology (composed of the ancient Greek μικρός mikrós "small", and biology ) is the science and teaching of microorganisms , i.e. living beings that cannot be recognized as individuals with the naked eye: archaea , bacteria , fungi , protozoa and and algae with few cells ( microalgae ), as well as viruses that are not living beings. Microbiology is a branch of biology and medicine .
Microbiology is divided into special areas according to various aspects. The classification is based on the application in other disciplines (e.g. medical microbiology , food microbiology , technical microbiology), the habitat of the microorganisms ( geomicrobiology , marine microbiology, soil microbiology) or the microorganism groups treated:
- Bacteriology , the science and teaching of bacteria
- Mycology , the science and teaching of mushrooms
- Protozoology , the science and doctrine of ancient animals
- Virology , the science and study of viruses
The affiliation of viruses to living beings and thus to microorganisms is controversial in biology. Usually viruses are not counted among the living beings or they are considered to be the borderline form of life . This unclear status does not change the fact that microbiologists also research viruses. Therefore, virology is to be seen as a branch of microbiology.
In microbiology, methods of cytology (science and teaching of cells), genetics , biochemistry , ecology and systematics are used. Because of the small size of the microorganisms, microscopy and methods for their cultivation play an important role.
Microbiology and its results are among others in the biotechnology , including food technology , waste technology , material technology and medicine applied. In addition, microorganisms are ideally suited as model organisms in genetic research, as they have relatively small, manageable genomes and can easily be examined in very large numbers.
Microbiological research began with the use of microscopes to examine a wide variety of small living things and objects by Robert Hooke on behalf of the Royal Society and, above all, the first discovery of several microorganisms by the private scholar and cloth merchant Antoni van Leeuwenhoek (around 1665–1670). Both were among the first to design useful microscopes (invented between 1590 and 1610) as an essential prerequisite for the development of microbiology.
Other important facts provided the research of Louis Pasteur (1822-1895), of 1864, the foundations for the process of pasteurization created: by briefly heating food which is fermentation prevented and thus the durability of food increased. In addition, Pasteur refuted the theory of spontaneous generation , which had been valid until then , which had assumed the spontaneous formation of microorganisms from inanimate matter since ancient times.
Medical microbiology was significantly promoted by the work of the Berlin bacteriologist Robert Koch (1843–1910), who was the first to systematically search for microorganisms that cause diseases and who proved this connection with the discovery of the tuberculosis pathogen ( Mycobacterium tuberculosis ). Microbiology also owes him the introduction of solid nutrient media for the cultivation of microorganisms. Koch initially used potato slices for this, later he used gelatin to solidify liquid nutrient media, and finally he introduced agar as a means of solidifying nutrient media.
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- Short question! Why don't bacteria like jam? Questions and answers for pupils, interested laypeople and students