pH and Microbial Growth Introduction: Each organism has an optimum environment for growth‚ which includes pH level. Organisms that grow at near neutral pH levels are called neutrophiles. Those that grow best in acidic pH values are called acidophiles. Others‚ yet‚ grow best in alkaline pH values and are called alkaliphiles. In this lab‚ each group was assigned an organism‚ which was then used to inoculate 6 different pH levels. Materials and Methods: Followed lab procedure 29‚ “pH and
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IB Biology Internal Assessment: Yeast Fermentation Rates Planning(a) Question- Growth: What is the effect on Yeast Growth/Expansion during fermentation when mixed in water of varying temperatures? Hypothesis- Temperatures above or below the recommended fermentation temperatures will contain less‚ or be void of growth‚ either due to inactivation or to yeast death. Variables- | | | | |
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ANAEROBIC RESPIRATION IN YEAST AIM: See the effect of temperature in anaerobic respiration of yeast by counting carbon dioxide bubbles. HYPHOTESIS: Anaerobic respiration in yeast will decrease as temperature increases. VARIABLES: Independent: Temperature Dependent: Rate of anaerobic respiration in yeast Fix: Volume of sugar solution (40ml) ‚ Concentration of sugar solution‚ yeast mass (2g)‚ volume of solution of yeast & sugar all together (20ml) MATERIALS: Delivering tube 2 test tubes
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Melanie McGivern. Access to nursing Group 2 Effects of pH on enzyme activity Contents Front cover Aim Introduction Hypothesis Prediction Variables Materials Methods Results Discussion Conclusion Bibliography Aim The aim of the experiment is to see the enzyme amylase catalyse starch in a chemical reaction. | | Introduction Enzymes are proteins. They act as catalysts‚ allowing chemical reactions to take
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Aerobic respiration in yeast Research question: What was the effect of anaerobic respiration in different environments determined the increase in size of a dough by the temperature? Hypothesis: It is hypothesized that if the temperature increases the dough will become bigger and bigger. Independent variable: (change) • Temperature • Height of the dough Dependent variable: (doesn’t change) • Amount of vegetable oil • Time • Volume of yeast solution Control variables: Variable
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Duanmu‚ Rika Fujita‚ Alex Chung October 8‚ 2011 Biology (Honors) P7 Gill Temperature and Yeast Fermentation Introduction: Saccharomyces cerevisiae‚ commonly known as baker’s yeast‚ is an key ingredient used mainly when baking bread or making alcoholic beverages. The main role of the yeast is to convert the sucrose into carbon dioxide (CO2) and ethanol. For example‚ when baking bread‚ the yeast ferments the sucrose within the dough and so CO2 and ethanol is released‚ causing the bread to
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Candidiasis Commonly known as the Yeast Infection Candidiasis is an infection caused by Candida fungi‚ especially Candida Albicans. These fungi are found almost everywhere in the environment. Some may live harmlessly along with the abundant "native" species of bacteria that normally grow the mouth‚ gastrointestinal tract and vagina. Usually‚ Candida is kept under control by the native bacteria and by the body’s immune defenses. If the native bacteria are decreased by antibiotics or if the person’s
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Optimal Level of Sugar for Yeast to Produce the Largest Volume of CO2? Purpose The purpose of this lab is to determine whether there is an optimal level of sugar added to well water for the added yeast to produce the largest volume of carbon dioxide. Background Information What is yeast? Yeast‚ whose scientific name is Saccharomyces Cerevisiae‚ are single-celled organisms that are a part of the fungi group. Yeast is very capable of alcoholic fermentation‚ where yeast cells primarily break down
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Amylopectin The absorbance value(x) read from cuvette containing starch and water represents the total amount of starch-iodine complex. The absorbance value(y) read from cuvette containing starch‚ water and α-amylase at the respective temperature or pH represents the amount of starch-iodine complex which is left after the enzyme has hydrolyzed the starch.In order to get the amount of product;P (maltose and glucose) formed‚ need to subtract the (y) value from the (x) value.
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Introduction Yeasts are a Leading cause of spoilage of yogurt‚ doogh and fermented milks in which the low pH provides a selective environment for their growth (Fleet‚ 1990; Rohm‚ Eliskasses‚ & Bräuer‚ 1992; Hansen and Jakobsen‚ 2004). Yogurts and doogh having initial counts of >100 CFU/g tend to spoil quickly. Yeasty and fermented off-flavors and Swelling of the doogh and yoghurt package are often detected when yeasts grow to 105–106 CFU/g (Fleet‚ 1990). Green and Ibe (1986)‚ Viljoen et al (2003)
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