Food science 6 - Viruses- consists of genetic material in a...

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Lecture 1: Food Microbiology Lesson 6 1. 3 Categories of Microorganisms in Food: 1. spoilage- organisms which cause food to become inedible 2. pathogens- which cause disease 3. beneficial- microorganisms which serve useful functions 2. Antoni van Leeuwenhoek and ‘wee animalcules’ 1. First to observe living bacteria and called them wee animalcules 3. 1. Solved mysteries of diseases such as rabies, antrax, colera 2. Proved that there is spontaneous generation 4. Robert Koch’s Postulates 1. Germ theory of Disease i. Proved that a particular agent was responsible for causing disease 5. Two Types of Cell Structure 1. Eukaryotic i. Have DNA ii. Has membrane-bound organelles 2. Prokaryotic i. No membrane structure ii. DNA is loosely contained within a region know as the nucleoid iii. Bacteria are prokaryotes 6. Types of Microorganisms: Bacteria-single-cell prokaryotes found in nearly all natural environments Yeast- single-cell eukaryotes important in fermentation Mold- multi-celluar eukaryotes often seen as responsible for spoilage of breads, fruits and vegetable s
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Unformatted text preview: Viruses- consists of genetic material in a protein coat; it is an intracellular parasite 1 Lecture 1: Food Microbiology Lesson 6 7. How many microbes are there? Food Item #Bacteria Food Item #Bacteria Beef steak 10,000 Broccoli 1,000,000 Hamburger 1,000,000 Carrots 10,000 Chicken 10,000 Tomatoes 10,000 Milk raw 1000 Corn 1,000,000 Milk (past.) 100 Frozen corn 1,000 Chicken salad 10,000 Green salad 1,000,000 Macaroni salad 10,000 pepper 10,000,000 8. Significance of Microbes in Food 1. The number of microorganisms in the food 2. Types of microorganism in the food. Are they spoilage organisms, beneficial or perhaps pathogenic. i. Pathogenic- just a few can make ou sick 3. The processing or storage treatments the food will receive 4. The individuals who might consume the food. Are they at-rish for serious illness? i. Young kids and the elderly at high risk 2...
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Food science 6 - Viruses- consists of genetic material in a...

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