FOOD PRESERVATION 1.0 Definition Food preservation is the process of treating and handling food to stop or slow down spoilage (loss of quality‚ edibility or nutritional value) and thus allow for longer storage. Preservation usually involves preventing the growth of bacteria‚ yeasts‚ fungi‚ and other micro-organisms (although some methods work by introducing benign bacteria‚ or fungi to the food)‚ as well as retarding the oxidation of fats which cause rancidity. Food preservation can also include
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Intro to Microbiology: Gram stain: Gram + Gram - Exotoxin Except Listeria has endotoxin Endotoxin Except Capsules Strep pneumo VERY Dangerous: (Some Strange Killers Have Pretty Nice Capsules) 1. Salmonella 2. Strep 3. Kleibsiella 4. Hemophilus B 5. Pseudomonas 6. Nisseria-(largest capsule- most likely cause of any toxicity) 7. Citroacter Gram (+) Gram (-) N-acetyl muramic acid (Nam) + N-acetyl glucosamine (Nag) = Peptidoglycan wall Contains
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Study Guide Notes ¡V Test 1 CHAPTER 1 1. Linnaeus ¡V naming system Hooke ¡V cells in cork Van Leeuwenhoek ¡V animalcules (1st obs. of live microorganisms) Redi ¡V experiment to disprove spontaneous generation ¡V meat Needham ¡V experiment to prove spontaneous generation ¡V broth (vital force) Spallanzani ¡V heated broth did not develop microbial growth Virchow ¡V biogenesis (living can only arise from preexisting living) Pasteur ¡V air contained‚ but did not produce‚ microbes (broth‚ s-flasks);
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What are bacteria? Bacteria are very different from viruses. First of all‚ bacteria are much larger in size. The largest virus is only as big as the very smallest bacterium (singular for bacteria). But bacteria are still microscopic and cannot be seen with the naked eye. They are so small that the sizes of bacteria are measured in micrometers (10‚000 micrometers = 1 centimeter). By comparison‚ the head of a pin is about 1000 micrometers wide. Though more complex than a virus‚ the structure of a
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Dwayne Hill. BC34M November 30‚ 2007 Lab Partner: Sasha-Kaye Graham Experiment 6 : Lectin Agglutination Aim: To study the agglutination pattern of different strains of Psuedomonas aeruginosa to different sialic acid-binding lectins. Absract: The cell membrane of two strains of Psuedomonas aeruginosa‚ P22 and P201 were treated the sialic acid lectins SNA I‚ WGA‚ MAL and HAA to confirm the presence of sialic acid carbohydrates in the cell surface membranes of these strains. This was done by
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95°C while the z-value is 11.2°C. Introduction Bacterial endospores are very resistant to hostile chemical and physical environments‚ thus allowing bacteria to lie dormant for extended periods. A few bacterial genera‚ such as Bacillus and Clostridium are capable of producing endospores. As these spores are resistant to heat‚ radiation‚ desiccation‚ and disinfectants‚ they are difficult to eliminate and are a frequent cause of contamination. In addition‚ endospores do not require nutrients to
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emerge. The following drugs are used to treat this infection: acyclovir (Zovirax)‚ famciclovir (Famvir)‚ and valacyclovir (Valtrex). 17. What is unusual about the origin of the popular drug Botox? The toxin in Botox is the same toxin produced by Clostridium Botulinum‚ the bacterium that causes food poisoning. The trade name Botox comes from the letters botulinum toxin. 2. Discuss the use of silver nitrate versus erythromycin to prevent newborns from developing eye infections due to gonorrhea. When
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Term | Definition | Systematic Biology / Systematics | * Study of the biodiversity * Quatitative science that uses the characteristics of living and fossil organisms(traits) to infer relationships between organisms over time | Taxonomy | * Branch of systematic biology * Process of identifying‚ naming and organising biodiversity into related categories | Taxon | General name for a group containing an organisms or groups of organisms that exhibit a set of shared traits | Classification
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Kingdom Monera Nerissa Mae F. Dadores MONERANS * Oldest and most abundant organisms. * Unicellular organisms without a nucleus. * Prokaryotes are single-celled organisms. They are the smallest‚ simplest organisms. * Microscopic & Undergoes Asexual reproduction. HISTORY The taxon Monera was first proposed as a phylum by Ernst Haeckel in 1866. Subsequently‚ the taxon was raised to the rank of kingdom in 1925 by Édouard Chatton. The last commonly accepted mega-classification
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SCI250 Week 5 Chapter 19 Integumentary System Quiz – Test Bank Section: Multiple Choice 1. The majority of the microorganisms on the surface of the human skin are ________ Gram-positive bacteria. Gram-negative bacteria. approximately equal numbers of Gram-positive and Gram-negative bacteria. Spore-forming bacteria. Enteric. 2. The outer layer of the skin is the _________ while the deeper layer is the _________ cutaneous‚ keratin. dermis‚ sebum. mucous‚ epidermis. epidermis‚ dermis. sebum‚ keratin
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