In this study‚ three general media will be used for the detection of microorganisms on the equipment‚ personnel‚ raw materials and the finished goods. These are Potato Dextrose Agar (PDA)‚ Plate Count Agar (PCA) and Violet Red Bile Agar (VRBA) under the Univar brand. The amount of each prepared medium or dehydrated medium depends on the number of samples to be tested. PDA is usually used for the presence of yeasts and molds which are the most common food
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Planarians A planarian is a small free-living flatworm. These flat worms are usually found under rocks in fresh water. They are part of the phylum Platyhelminthes and in the class Turbellaria. Planarians are usually zoophagous‚ they feed on small living invertebrates and decaying organisms found in their community. Some planarians could eat segmented worms‚ leeches‚ snails‚ and other small herbivores. Planarians may also be organisms that gain their food energy with the help of decomposing
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LAB REPORT WOODLICE Daan Rijpkema May 2009 T4Y - General Science X Words TABLE OF CONTENTS Aim..........................................................................................................................................................2 Hypothesis...............................................................................................................................................2 Materials ............................................................................
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1. Make sure you label both plates on the bottom‚ with your name‚ date and name of pathogen you have chosen (listed above under materials) Then label numbers 1-5 on one plate and 6-10 on the other as there are 10 disks that need to be placed. Spread out in a circle formation like pictured below (This is the final product; look at this for reference on how to label) Now you are ready to start culturing. Start with one of your plates you can do both at the same time but to avoid making any errors
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The antifeedant activity of the extracts choice and no-choice test methods‚ after 24 and 48 hours in each test‚ against 7 day old (3rd instar) larvae of S. litura on castor leaves. Stock solutions of the test compounds were prepared in the carrier solvents. Further dilution was done in emulsified water by maintaining emulsifier (Tween – 80) level at 0.5 % to yield various concentrations. Castor leaf discs (4 cm diameter) were punched out from the washed and dried castor leaves. Leaf discs were dipped
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OSMOSIS IN POTATO TISSUES Vanessa Tsao‚ Lovette To‚ Wang Yeyun‚ Zhang Shenjia‚ Alicia Mak Class 101‚ Nanyang Girls’ High School‚ 2 Linden Drive‚ Singapore 288683 ABSTRACT In this project‚ the relationship between the concentration of salt solution and the length of the potato strip that was immersed in it was investigated. Five strips of potato of the same length were placed in different Petri dishes that contained water of different salt concentration. They were left for twenty minutes and the length
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Chloe Lindbom Regeneration of a Planarian Over Time Erin Davis Biology Mrs. Werfelman 5th Hour 10/09/2014 10/20/2014 Background: The planarian‚ also known as the flatworm‚ is a creature that live all over land‚ oceans‚ and freshwater. (Biggs‚ A.‚ Gregg‚ K.‚ Hagins‚ W.‚ Kapicka‚ C.‚ Lundgren‚ L.‚ Rillero‚ P.‚ 2002) The planarian has a threebranched digestive cavity. (Alvarado‚ 2004) Planaria range from 1/8 to 1 inch. (Alvarado‚ 2004) The planarian can be cut into many pieces and each piece will grow
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TITLE: Toxicity Testing and Determining the LC50 INTRODUCTION: Our main objective for this experiment was to determine which three chemicals were going to be the most toxic to the brine shrimp by adding drops of vinegar‚ bleach and ammonia to the controlled water. We found that the vinegar was the most effective and the quickest. The ending results were very interesting when being compared to our hypothesis and we learned that some chemicals can react faster than others and each contains a different
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3DIFUSSION IN AGAR CUBES – LAB REPORT Research Question: What is the effect of surface area on volume ratio on the rate of diffusion of pigment from the agar cube measured by percentage volume of diffusion over time? Background Research: Diffusion is the passive movement of molecules or particles along a concentration gradient‚ or from high to low concentration regions. Essential towards living organism’s functions‚ as it describes how the nerve cells are able to communicate with each other‚ through
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Acid into Different Sizes of Agar Blocks Aim: Investigating the relationship between the diffusion and the surface area to volume ratio‚ with agar and hydrochloric acid. Research Question: How does the difference in surface area to volume ratio affect the diffusion? Hypothesis: As the area to volume ratio increases‚ the time taken for a complete diffusion will also increase. Background Information: Agar is a jelly like substance and in this experiment‚ agar will be used is containing
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