Lab: Sampling Bacteria Purpose: Refer to handout sheet. Materials: Refer to handout sheet. Procedure: Refer to handout sheet. Pre-Lab Questions: 1. Why is one dish being reserved for the class as a "control"? Having a controlled variable is important in order to be able to look at what the bacteria would look like if it hadn’t been contaminated and just left as agar. Having a sample of agar that wasnt exposed to any bacteria will provide a clear picutre of what grew on the agar
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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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characteristics could be distinguished different colonies‚ such as‚ shape‚ size‚ color‚ and consistency. 4. Why should a Petri dish not be left open for any extended period of time? Ans: A Petri dish is a medium which using to grow bacteria cultures. If we leave the plate open on the air‚ it might increase the probability that microbes culture we don’t expect growing in the Petri dish. 5. Why does the streaking method you used to inoculate your plates result in isolated colonies? Ans: we streak
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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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COMPARISON BETWEEN PLACENTA AGAR AND NUTRIENT AGAR ON GROWTH OF Staphylococcus aureus AND Escherichia coli Chloe Dominique Acero Kristine Marie Gonzales Hannah Marie Hermosisima Patrisha joy Morales Joanna Keziah Ramos Group 4 BSMT3E Background of the Study Placenta is an organ characteristic of a true mammal during pregnancy‚ joining mother and offspring‚ providing endocrine secretion and selective exchange of soluble‚ but not particulate
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Effects of Allelopathy on Plants Dates experiment was conducted: Purpose: The purpose of this experiment is to design a controlled experiment to see if a plant could survive living in eucalyptus tea. Allelopathy is when a plant gives off a bio-chemical that kills that plants around it‚ such as eucalyptus trees‚ black walnut trees‚ etc. My class went to the a eucalyptus grove and observed the eucalyptus trees. We noticed that there was a small circle around the tree that had nothing growing
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around bacteria. I was suggested to do a project where I get a petri dish containing my oral bacteria and see the effects of liquid on my oral bacteria. I was very curious about this topic and wanted to know how the bacteria grows so I gave it a shot. For my project‚ I was told to make an “if and then” hypothesis. My hypothesis was that “If I put orange juice on a petri dish containing my oral bacteria then the bacteria on the petri dish will multiply.” For this experiment‚ I gathered all the materials
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For this experiment petri-dish A is fully exposed to the light source while petri-dish B is partially exposed to the light. Independent Variable: We have chosen our independent variable to be the amount of light exposed to the cress seeds. Our first petri-dish was allowed to be fully exposed to the light surrounding it‚ while the second was fully wrapped in black paper excluding a 0.5cm slit directed towards the sun. Dependent Variable: Our dependent variable is the reaction/actions to
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Beaker (Extra large) for tested Brine Shrimp Our procedures consisted of eight steps. Step 1- We all put on our safety goggles before gathering our materials. Step 2- We gathered our 4 petri dishes and labeled them using a grease pencil. One petri dish labeled “C” for Control‚ “V” for Vinegar‚ “A” for Ammonia and “B” for Bleach. Step 3- Once the petri dishes were labeled‚ we took a 25 ml cylinder and used a pipette to gather 12 brine shrimp to put inside of the cylinder. Using the measurement lines
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ROBYN STACEY is a well-known Australian photographer who has exhibited large and powerful images both in Australia and overseas. Stacey’s work shows a fascination with the use of history to inform our present. Her interest in archives from museums led to her taxonomy artworks in which she researched and photographed archival repositories from museums in Australia and overseas. The artworks produced from these collections show powerful and striking photographic arrangements. The photographs allow
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