Download Free Medical Bacteria and Viruses PowerPoint Presentation

Bacteria and Viruses PowerPoint Presentation

DOWNLOAD MEDICAL POWERPOINT PRESENTATION

About This Presentation

Description : Check out this medical presentation on Influenza (Flu), which is titled "Bacteria and Viruses", to know about viruses and bacteria.

Tags : Influenza, Flu, viruses, bacteria

Published on : Jul 12, 2021 | Views : 2252 | Downloads : 3

Shareable Url :

Embed Code :

Comment

Transcript

Slide 1-

Bacteria and Viruses
Slide 2-

Bacteria Bacteria are microscopic, unicellular (one-celled) organisms that lack a nuclear membrane Bacteria can live on land, in water, and in the air They also live in and on both living and dead plants and animals Most bacteria are heterotrophs. Heterotrophs are organisms that cannot make their own food
Slide 3-

ppt slide no 3 content not found
Slide 4-

Shapes of Bacteria Coccus - round or sphere shaped Bacillus – rod shaped Spirillum – spiral shaped
Slide 5-

Structure of Bacteria A bacterium is made up of a thick cell wall that encloses and protects cellular material
Slide 6-

Bacterial Nutrition Some bacteria live separately and others remain together to form colonies Colonies are large groups of bacteria
Slide 7-

Bacterial Nutrition There are bacteria that live as parasites A parasite absorbs food materials from other living organisms called their hosts Others digest and absorb food materials from dead organisms These bacteria are called saprophytes
Slide 8-

Beneficial Bacteria Most bacteria are beneficial (helpful) to humans Bacteria are decomposers that cause decay Decomposers are organisms that break down dead organisms and return the nutrients to the soil
Slide 9-

Beneficial Bacteria Many bacteria are used to produce food and life-saving drugs Bacteria are used to make cheese, pickles, yogurt, vinegar, and sauerkraut
Slide 10-

Beneficial Bacteria By using methods of gene transplanting, bacteria have been encouraged to produce substances such as insulin
Slide 11-

Beneficial Bacteria The human intestinal tract contains millions of bacteria Many of these bacteria help the digestive process and others produce vitamins
Slide 12-

Beneficial Bacteria Bacteria are also used in the tanning of leather, the curing of tobacco, and the production of food for feeding cows
Slide 13-

Harmful Bacteria Some bacteria are not beneficial to man Bacteria spoil food by secreting enzymes into the food causing it to rot Along with enzymes, other substances produced by bacteria are released into the food Some of these substances are toxic, making the food poisonous to humans and other organisms
Slide 14-

Harmful Bacteria Bacteria in large numbers can pollute (dirty) lakes, streams, and drinking water During respiration, bacteria reduce the dissolved oxygen content in water supplies
Slide 15-

Harmful Bacteria Many bacteria are pathogenic A pathogen is an organism that causes disease and/or infection Some bacterial diseases of humans are tuberculosis, tetanus, and strep throat
Slide 16-

Controlling Harmful Bacteria Antiseptics, disinfectants, and antibiotics are used to control pathogenic bacteria An antibiotic is a chemical that can stop the growth of some bacteria Bacteria are able to produce types that are resistant to certain antibiotics When this happens, new antibiotics must be developed.
Slide 17-

Controlling Harmful Bacteria Bacteria can also be killed in foods by pasteurization canning chemical preservatives radiation steam/pressure salt curing dehydration (drying)
Slide 18-

Harmful Anaerobic Bacteria Some bacteria can live anaerobically and cause botulism A dangerous type of food poisoning, in foods that have not been properly canned
Slide 19-

Harmful Anaerobic Bacteria Two other anaerobic bacteria can cause venereal diseases Gonorrhea (causes sterility) Syphilis (can result in death) A venereal disease is a contagious disease that a person gets through sexual contact Both diseases can be treated successfully by antibiotics if detected early enough
Slide 20-

Viruses A virus is not a cell It is made up of genetic material inside a protein coat Viruses do not carry on most metabolic activities
Slide 21-

Viruses They can only reproduce inside a living cell called the host cell Outside the host cell, a virus is “lifeless” and often exists as a crystal A virus has no means of locomotion
Slide 22-

Virus Reproduction
Slide 23-

ppt slide no 23 content not found
Slide 24-

Negative Virus Influences They cause infections in both plants and animals Some viruses cause tumors and warts They also destroy cells and are responsible for human diseases such as polio measles mumps influenza hepatitis colds AIDS
Slide 25-

Human Papilloma Virus - Warts Influenza Virus - Flu Human Immunodeficiency Virus AIDS Rabies Virus
Slide 26-

Positive Virus Influences Certain viruses are used in the control of insect pests Others are used in genetic research Scientists have been able to use viruses to biologically control caterpillars of the European pine sawfly and the gypsy moth