Microorganisms Friends And Foe Part 1

Microorganisms Friends And Foe Part 1

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  Micro organisms frien andfoe Chapter 2
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  content ✔ Introduction ✔Discovery ✔ Microorganisms ✔Habitatof Microbes ✔ Classification of Microorganisms o Bacteria o Fungus o Algae o Protozoa
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  The existence ofmicroscopic organisms was discovered during the period 1665– 83 by two Fellows of The Royal Society, Robert Hooke and Antoni van Leeuwenhoek. In Micrographia (1665), Hooke presented the first published depiction of a microorganism, the micro fungus Mucor. Discovery
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  o May beunicellular or Multicellular. o May exist alone like amoeba or in colony like bacteria and fungi. o Found in all kinds of climate like hot climate, cold climate, deserts, marshy lands. o They are also found in the body of other organisms.
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  Microorganisms They are offour types 7/29/2020SavRa
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  Types of microorganisms They are hardy because they form a hard outer covering called a cyst around themselves.  They do this when conditions are not favorable, such as under extreme conditions of temperature and dryness.  They survive by remaining inactive within the cyst until conditions are favorable again 7/29/2020SavRa
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  Bacteria Shapes Activities Structure Nutrition Uses of Bacteria 7/29/2020SavRa
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   These aresingle-celled organisms with a rigid cell wall.  They constitute a large domain of prokaryotic microorganisms  These are the smallest unit of life.  They can only be seen under a microscope which enlarges images from 100 to 1000 times.  Found in wide range of habitats ranging from glaciers to deserts and hot springs. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.  Example. Curd bacteria is Lactobacillus.  Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals Bacter ia 7/29/2020SavRa
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  o Unicellular o Livein colonies o Lack nucleus o Have ribosomes o Some respire aerobically and some anaerobically 7/29/2020SavRa
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  Activities Take few dropsof pond water or drain water on a clean slide and observe it under microscope. You will observe many small organisms moving in the drop of water which are otherwise not visible to the naked eyes. Image under microscope. Take the scrap from your tooth or mouth put it on a clean slide and observe it under microscope. You will observe many small rod like organisms which are otherwise not visible to the naked eyes. 1 2 7/29/2020SavRa
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  Cell is boundby rigid cell wall. Within the cell wall is a cell membrane. It lacks well defined nucleus. Bacteria are single celled microbes. The cell structure is simpler than that of other organisms as there is no nucleus or membrane bound organelles.  Instead their control center containing the genetic information is contained in a single loop of DNA. Some bacteria have an extra circle of genetic material called a plasmid. Some bacterial cells have long thread like structure called flagella for mobility. 7/29/2020SavRa
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  Bacterial Nutrition Heterotrophic Saprophytic Parasitic Autotrophic Photoautotrophic Chemoautotrophic •Depends on external sources for their food. • Cannot use CO2 as a carbon source. • Synthesize their own food. • Can use CO2 as their sole carbon fixation. Feed on dead decaying organic matter. E.g Acetobacter, clostridium Take food from live host. eg,. Diseases causing bacteria. Salmonella typhi. Use light . e.g purple Sulphur bacteria 7/29/2020SavRa
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  Industrial uses: Cleaning upoil spills. Sewage decomposition. Mining Synthesizing drugs through genetic engineering. Like insulin. Some other uses: Dairy industries Wine industry Medicinal industries Daily uses: Produces wide variety of food and beverages. Conversion of milk into curd. Cheese, Yoghurt Uses of Bacteria 7/29/2020SavRa
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  Contact us :[email protected] Any Questions?This Presentation is Prepared 7/29/2020SavRa