Julius Richard Petri

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    How Do Bacteria Grow

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    different places. Also, different types of bacteria grow in different conditions. From prior experience, I remembered that to grow bacteria in a petri dish one must follow the proper technique. I chose to test how much bacteria grows on toilet handle in the bathroom. My prediction for the experiment before it was conducted was that there would be a large amount of bacterial growth on the handle of a public bathroom toilet. This was my hypothesis because many people touch the toilet handle after using the bathroom and before washing their hands. I predicted that the most bacteria would be found on objects that were touched by many different people throughout a day. To conduct this experiment, everyone in the class got in pairs. Each pair shared a petri dish to grow bacteria in. The first thing the partners did once they got their petri dish was to turn the dish upside…

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    most growth compared to the other strain of yeast. Methods In this experiment, we used two different sugars, sucrose and glycerol, and individually placed them into two different strains of yeast. In this experiment each of the petri dishes contained 1/3 of 143 flo ↑, 140 flo ↓, and 138 WT. However, 138 WT was not inoculated because it was not being tested. For this experiment, we inoculated two kinds of sugars on a sterile cotton swab and then swabbed two petri dishes with sucrose and two…

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    Acne And Treatment Of Acne

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    Table of Contents: Introduction………………………………………………………………………………………………………………………..2 Aim……………………………………………………………………………………………………………………………………….2 Background Info……………………………………………………………………………………………………………………2 Hypothesis…………………………………………………………………………………………………………………………….2 Variables……………………………………………………………………………………………………………………………….2/3 • Independent…………………………………………………………………………………………………………………………..2 • Dependent……………………………………………………………………………………………………………………………..3 •…

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    Method: Purpose: To investigate how Porcellio Scaber reacts in terms of orthokinesis to different humidities in their habitat. Equipment-  75 slaters which range from 5-10mm in length (kept in a plastic container with holes in the lid, with dirt and bark so that they are kept in a natural environment as possible so can react naturally during experiment.)  5x petri dish set ups labelled from 50-90% (One petri dish on the bottom will contain glycerol and have a mesh/gauze hot glued over top…

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    Photosynthesis Lab

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    Methods: To start this experiment place four seeds in four separate petri dishes with a damp paper towel. Once the seed germinates and the plant has begun to sprout, move the seeds to four separate pots, and add soil. Once the plants have begun to sprout take the measurement of each plant and record your data for day zero. Next, take three glass containers of greatly varying volumes (41,4185cm3, 2,250cm3, and 602cm3 were used). Before the plants are placed underneath these containers, give…

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    colony will be transferred to a clean glass slide and will be smeared and heat-fixed. The slide will be flooded with crystal violet for 1 minute and rinsing with distilled water. Next, the slide will be flooded with iodine solution for 1 minute, and rinsed with distilled water. It is then decolorized with alcohol and will be drained, and counterstained with safranin for 30 seconds. The slide will be rinsed and excess stain will be wiped out, and then air dry. Finally, the slide will be observed…

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    Petri Research Paper

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    To change solid agar into liquid, get 4 Petri dishes out and ready for use. Next, agar needs to be a boil, either on heating pot or stove, not in a microwave. Agar bottle needs to be placed inside the pot, with water in it to be a boil. Water level needs to be right under the label on the agar bottle, with the cover losing, or it will explode. Agar needs to be boil for about 30 to 45 minutes, until agar liquefied. Then pour agar inside the petri dish, about half full. Make sure agar is fully…

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    Bacteriophage Experiment

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    liquid containing the phage is known as supernatant.The supernatant was filtered through a .22 micron filter in order to extract phages. Since bacteria and other particles tend to be bigger than .22 microns, they would not fit through the filter, thus allowing only phages through. Mycobacterium smegmatis was then added to the supernatant in the amount of .5 mL. It was allowed to incubate for 5 days. After incubating, 1.4 mL of the enriched filtrate was pipetted into a microcentrifuge tube. This…

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    Sordaria Lab Report

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    In order to obtain accurate numbers from the now grown-out Sordaria samples, a small procedure was followed. First, a sample of fungi was taken from the border of a WT and TT section in the Petri dish. A slide was prepared by placing one drop of water on the middle of it, the Sordaria sample on top, and a slide coverslip on top of the sample. The eraser of a pencil was used to lightly press on the coverslip in order to release the asci so that they can be seen. Under a microscope, a multitude of…

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    Bulb Biology Lab

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    In this lab, we took four separate onion bulbs, labeled them A,B,C, and D, and put them in a beaker filled with water. We recorded the growth in number of roots and their average length for days one, two, and five. Then we put Bulbs B, C, and D in beakers with different amounts of caffeine and left Bulb A in water. We then recorded the number of roots and their average length on days two, three, and four. After that, we took and onion root form Bulbs A, B, C, and D, stained them, and looked for…

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