“Bacteria can be divided into gram negative or gram positive depending on their cell wall/peptidoglycan make up. Gram positive implies thick peptidoglycan layer and stain a purple colour.
There are two main spp of gram positive cocci that causes human infections. These are Streptococci and staphylococci, they are differentiated by two main criteria: first their ability to produce the enzyme catalase. Streptococci are catalase negative. Staphylococci are catalase positive, which allow them to convert hydrogen peroxide to water and oxygen gas. Hence on a slide or tube bubbles are formed. Second criteria to differentiate staph and strep is based on microscopic appearance. Staphylococcus spp are usually in clusters, where as streptococci are arranged in pairs, or chains.
Streptococcal infections remain a serious health problem worldwide.
The streptococci are divided based on their oxygen requirement are classified into aerobes/facultative anaerobes and obligate anaerobes. Here we are focusing on the aerobic and facultative anaerobes which make up majority of strep spp. I am writing aerobic here because facultative anaerobes are able to survive in oxygen.
The Gram- positive streptococci are then further divided into the haemolytic properties in blood. The streptococcus spp. are smeared in blood agar which is a plate containing blood. Haemolytic property of the bacteria mean the bacteria ability to haemolyse, breakdown red blood cells. Streptococci are divided into three haemolytic groups:
· Alpha haemolytic
· Beta haemolytic
· Gamma haemolytic
Where do I get my information from: http://armandoh.org/resource
It’s the night before the big game! You’re carbo-loading! Wait, what are carbs? Did you know that sugar is a carbohydrate? You didn’t?! Well, you’d better watch this, my friend. We will cover all the monosaccharides in their linear and cyclic form. That’ll get you up to speed. Now get some sleep! You’ll need to be rested if you’re going to beat those kids from Khan Academy in the morning.
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Pharmacological Lab Procedures: Benedict’s Test – Qualitative Test in Carbohydrates. KNUST OER 2012. CC:BY-NC. George Koffuor
The Benedict’s test procedure is demonstrated in this video. Benedict’s test distinguishes reducing sugars from non reducing sugars. At the end of this video lesson, students should be able to distinguish between reducing and non reducing sugars using the Benedict’s test, outline the test process and write a well balanced reaction equation for the test.
The full course module is available at http://web.knust.edu.gh/oer/pages/index.php?siteid=knustoer&page=find_materials&cou=38
This is licensed under a Creative Commons Attribution-Noncommercial 3.0 License http://creativecommons.org/licenses/by-nc/3.0/
Find more at http://oer.knust.edu.gh Video Rating: / 5
What are carbohydrates & sugars? Carbohydrates simple sugars as well as complex carbohydrates and provide us with calories, or energy. Find more videos at http://osms.it/more.
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Here’s a quick guide to the keto diet, which is the hot new plan on the block.
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Learn how to turn your favorite recipes into Keto-friendly meals.
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