![]() And so what you can see it has this spiral or corkscrew shape. The third main type of morphology that bacteria can take is spurring lem and spiral. Coli which creates these rod shapes or this bacillus morphology and then last but not least. And an example of this is actually a shriek E. And so you can see here that it creates these elongated rods as you see here. Now the next one that we have here is bacillus and bacillus is a rod shaped morphology. And so uh staphylococcus arias is an example of a bacteria that has circular morphology, caucus morphology. ![]() And so as you can see down below, the shapes of some bacteria are circular as you can see here. And so the first bacterial cell morphology is caucus and caucus is circular shaped. ![]() Now really there are three main bacterial cell morphology is that we have numbered down below one, two And three over here. And so bacterial cells typically range between 0.2 to 2.0 micro meters In diameter and about 2-8 μm in length. For example resistance genes can be transferred from one plasmid to another plasmid or chromosome, or resistance can occur due to a random spontaneous chromosomal mutation.In this video we're going to begin our lesson on the types of bacterial cell morphology. Acquired resistance occurs when a bacterium that was originally sensitive to an antibiotic develops resistance. Some bacteria are naturally resistant to some antibiotics due to their physiological characteristics. How is resistance spread?Īntibiotic resistance can either be inherent or acquired. In ideal conditions some bacterial cells can divide every 20 minutes therefore after only 8 hours in excess of 16 million bacterial cells carrying resistance to that antibiotic could exist. As the bacterial cell with acquired resistance multiplies, this resistance is passed on to its offspring. If a strain of a bacterial species acquires resistance to an antibiotic, it will survive the treatment. Treating a patient with antibiotics causes the microbes to adapt or die this is known as ‘selective pressure’. The emergence and spread of antibacterial-resistant bacteria has continued to grow due to both the over-use and misuse of antibiotics. ![]() Antibiotic resistanceīacteria are termed drug-resistant when they are no longer inhibited by an antibiotic to which they were previously sensitive. Tetracycline is effective against a wide range of organisms and is known as a broad spectrum antibiotic. Penicillin G will destroy only a few species of bacteria and is known as a narrow spectrum antibiotic. They can prevent the bacterial cells from multiplying so that the bacterial population remains the same, allowing the host’s defence mechanism to fight the infection or kill the bacteria, for example stopping the mechanism responsible for building their cell walls.Īn antibiotic can also be classified according to the range of pathogens against which it is effective. 3D illustration showing spores conidia and conidiophore.Īntibiotics take advantage of the difference between the structure of the bacterial cell and the host’s cell. © Dr_Microbe / iStockįungi Penicillium which cause food spoilage and are used for production of the first antibiotic penicillin. This gives the microbe an advantage when competing for food and water and other limited resources in a particular habitat, as the antibiotic kills off their competition. They are produced in nature by soil bacteria and fungi. Antibiotics are chemicals that kill or inhibit the growth of bacteria and are used to treat bacterial infections.
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