Introduction to Microbes and Classification
Here today we will study which organisms do we have to study in microbiology.
Microbiology includes study of all micro-organisms i.e. it includes Bacteria's , Viruses , Fungi , Protozoans and Algae. Some of them are prokaryotic and some of them are Eukaryotic. Now let us see the difference between them-
Now let us study each of the type of microbes mentioned above -
1. Bacterias
Carl Woese had used RNA studies to group all the organisms into three domains
Hope this was easy to understand , if you have doubt you can contact me.
Now we will study the Monera kingdom , Archaebacteria , cyanobacteria and bacteria's in the next post.
For any Query or suggestion please mail me or leave comments
Thank you
Microbiology includes study of all micro-organisms i.e. it includes Bacteria's , Viruses , Fungi , Protozoans and Algae. Some of them are prokaryotic and some of them are Eukaryotic. Now let us see the difference between them-
![Image result for prokaryotic and eukaryotic cells](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhALWmTqkSCdOubk6YibN2W8vNiiopvJ-qT_dyJ0lT1fNodIJqJZfZP_WZI8_5yJOX0jfYb-HdbnFEJybmuUxlnBhez7YW1eyzZvD4XfFwGUm4T_-ZMQ4j5q_DwapAsrcPbqWqTTpXapg/s1600/Differense+Between+Prokaryotic+and+Eukaryotic+Cells.png)
Now let us study each of the type of microbes mentioned above -
1. Bacterias
- Usually size ranges from 0.2 to 100 micrometres
- Prokaryotic , unicellular , simple internal structure
- Can be grown on artificial laboratory media
- Reproduction is usually asexual characteristically by simple cell division
- Significance- Some cause disease , some perform important role in nutrient cycles leading to fertility of soil, Useful in industries for production of compounds, some spoil while so make foods.
- Examples - Methanococcus , Mycoplasma , etc.
- Acellular and size varies from 0.015 to 0.2 micrometres
- They all are obligate parasites so need living host
- Do not grow on artifical media
- Electron microscope is needed to see them
- Usually they have just genetic material surrounded by protein coat
- Significance-Cause diseases in humans , animals , plants as well as bacteria's
- Examples - HIV virus that causes aids , TMV(Tobacco mosaic virus) that affects plants ,etc.
![Image result for hiv](https://www.avert.org/sites/default/files/styles/article_scale_style_780/public/Science.jpg?itok=GsQOoPHn×tamp=1454087005)
- Yeasts(Unicellular)-
- Eukaryotic ,unicellular fungi
- Size varies from 5 to 10 micrometres
- Laboratory cultivation like bacteria's is possible
- Reproduction by budding , cell division or sexually
- Significance - Useful in production of alcoholic beverages, also used as food supplement , some cause diseases.
- Example-Saccharomyces cerevisiae
- Moulds(Multicellular)
- Eukaryotic , multicellular fungi
- Size varies from 2 to 10 micrometres
- They have many distinctive features
- Can be cultivated in laboratory
- reproduction by sexual or asexual processes
- Significance-Responsible of decomposition of many materials, useful for industrial production of many chemicals ( including penicillin), some cause diseases in plants ,animals and humans.
- Example - Aspergillus niger
- Size varies from 2 to 200 micrometres
- Eukaryotic , unicellular
- Some can be cultivated in laboratory
- some are intracellular parasites
- reproduction by asexual or sexual processes
- Significance- Food for aquatic animals and some are disease causing
- Example- Amoeba
![Image result for protozoan](https://kajaljoshiblog.files.wordpress.com/2016/10/protozoans_3.jpg?w=900)
- Size ranges from 1 micrometre to many feet
- Eukaryotic , can be unicellular or multicellular
- Most occur in aquatic environments
- contain chlorophyll and are thus photosynthetic
- reproduction can be sexual or asexual
- Significance- Important to production of food in aquatic environments , used as food supplements and in pharmaceutical preparations , source of agar , some produce toxic products.
- Example - Chlamydomonas , chlorella ,etc.
Carl Woese had used RNA studies to group all the organisms into three domains
- Archaea
- Bacteria(Eubacteria)
- Eukarya
- Cell type- Prokaryotic or eukaryotic
- Level of organisation - Solitary or colonial and unicellular or multicellular
- Nutritional type - Ingestive , absorptive or autotrophic
- Monera
- Protista
- Fungii
- Plantae
- Animalia
The five kingdom system was not accepted by many scientists because of the lack of distinction between Archaebacteria and Eubacteria. So new six kingdom system was introduced as follows-
![Image result for six kingdom concept](https://s-media-cache-ak0.pinimg.com/originals/35/c5/8e/35c58ed6393b8ef73fc0191881aa9a64.png)
Hope this was easy to understand , if you have doubt you can contact me.
Now we will study the Monera kingdom , Archaebacteria , cyanobacteria and bacteria's in the next post.
For any Query or suggestion please mail me or leave comments
Thank you
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