2 differential because this medium contains a ph

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2. Differential because this medium contains a pH -sensitive dye to identify organisms that ferment ________ (a sugar-alcohol ). Organic acid wastes mannitol fermenters produce change the medium from red to yellow. MSA works well for identifying pathogenic staphylococci , such as Staphylococcus aureus , which will ferment mannitol. Most non-pathogenic staphylococci (Staphylococcus epidermidis) will not ferment mannitol. Q: Regardless of the color of the plate, what do know about bacteria found growing on Mannitol Salt? Q: If there is growth, additional information can then be obtained about bacteria growing based on color of the medium. Images: Sterile Mannitol Salt Agar & Positive & negative differential reaction on Mannitol Salt Agar, T. Port From the Virtual Microbiology Classroom on ScienceProfOnline.com Watch VIDEO : How to Interpret Mannitol Salt Agar (MSA)
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Ions & _______ Compounds that dissociate in water and produce cations other than H+ and anions other than OH- are called salts . The most familiar salt is sodium chloride , the principal component of common table salt . Other examples of salts: Baking soda (NaHCO3) Epsom Salts (MgSO4) From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Salts: The Role of _________ • Certain salts, called buffers , can combine with excess hydrogen (H+) or hydroxyl (OH-) ions. From the Virtual Microbiology Classroom on ScienceProfOnline.com • Produce substances less acidic or alkaline. Example: Antacids are buffers made of the salt calcium carbonate (CaCo3). Images: Antacid Tablets , Wiki
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Antacids & _______ _________ From the Virtual Microbiology Classroom on ScienceProfOnline.com Images: Vibrio vulnificus , PHIL 7815, Antacid Tablets , Wiki Raw Oysters , David.Monniaux, Wiki Acidic environment of stomach kills many bacteria before they can cause disease. Researchers have found that antacids, in a simulated gastric environment, significantly increase survival rate of Vibrio vulnificus , leading cause of food-poisoning fatalities in US.
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Three Main Types of Chemical Bonds: 1. _______ 2. _______ 3. _______ Image: Formation of ionic sodium fluoride , Wdcf; Methane Covalent Bonds , Dynablast, Wiki; DNA Chemical Structure , Madprime, Wiki From the Virtual Microbiology Classroom on ScienceProfOnline.com
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_________ Bonds Covalent Bonds : Involve the sharing of a pair of electrons between two atoms. Found mainly … organic compounds Image: Methane Covalent Bonds , Dynablast, Wiki From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Oxidation - Reduction Reaction • Or Redox reaction = chemical reactions in which electrons are gained , lost ( Q: What kind of bond? ) or shared ( Q: What kind of bond? ) in a chemical reaction. ________ describes the loss of electrons by a molecule, atom or ion. _________ describes the gain of electrons by a molecule, atom or ion. From the Virtual Microbiology Classroom on ScienceProfOnline.com
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Oil Rig Image: Oil Rig Platform , Nasa From the Virtual Microbiology Classroom on ScienceProfOnline.com Understanding redox reactions will be an important part of your mastering Microbial Metabolism!
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Three Main Types of Chemical Bonds: 1. _______ 2. _______ 3. _______ Image:
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