We then used a cork borer to cut two holes in the agar 1cm apart. We then filled one hole with potassium ferricyanide. Next we filled the other hole with ferrous sulfate. We then observed the petri at an interval of 15 minutes. We observed and recorded results. Results: 1. Yellow solution is spreading out from the hole and into the gel and clear solution. 2. The clear ferrous was not clear to see‚ but it conjoined with the yellow solution 3.
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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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Advancements of Medicine in the 1920’s Medicine had a huge advancement in the 1920s. Many scientists had discovered medicines‚ but it was hard for them to purify them and give them to people. Because of the discovery of penicillin‚ insulin‚ Band-Aids‚ and vitamins‚ the lives of the American people were greatly changed. Band-Aids were invented in 1920. An employee at Johnson and Johnson‚ Earle Dickson‚ made a way to help his wife with the various cuts that she would get throughout the day. He made
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of bacterial species: about 10 million to a billion What is a microorganism? An organism or virus too small to be seen without a microscope. (Smaller than 0.5 mm) Ex: Bacteria‚ Fungi‚ Protozoa‚ Algae‚ and Viruses Microbiom: collection of microbes Human cells vs. Microbial cells = 1:10 Which statement about Michaelangelo is not correct? A. He was an Italian sculptor‚ painter‚ architect‚ poet and engineer B. His masterpiece sculptor “David”‚ was made between 1501 and 1504 C. He was
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INTRODUCTION TO DROSOPHILA GENETICS DROSOPHILA CULTURE We will study basic principles of Mendelian inheritance with the use of the fruit fly‚ Drosophila melanogaster [the name means “black-bodied fruit-lover”]. Drosophila was one of the first organisms to be studied genetically: its small size‚ short life cycle (10 ~14 days at 25oC)‚ high reproductive rate (an adult female can lay 400-500 eggs in 10 days)‚ and ease of culture and genetic manipulation have made it perhaps the best understood animal
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require the use of virulent human pathogens. However‚ many types of microorganisms are potentially pathogenic. This means that‚ although they would not cause disease in a normal healthy host‚ they might possibly do so if a large enough quantity of the microbes came into contact with a compromised host‚ such as by wounds and cuts. In addition to microorganisms‚ there are some chemicals used in this laboratory that are potentially harmful. Many procedures involve glassware‚ open flames‚ and sharp objects
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crystals and their growth Hypothesis: ~ the crystals will grow better when they are in room temperature. Dependent variable: ~ the size of the crystals. Independent variable: ~ the temperature. Controlled variable: ~ ml’s of copper sulphate per dish‚ the same dishes‚ the volume and concentration. Method: ~ 1. Set up 12 watch glasses with 20ml of copper sulphate (wet) solution in each. 2. Place 4 of the dishes in a
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Purity and Hope in Nature The summer solstice marks a shift in the year: everyday gradually becomes shorter‚ and closer to winter. In some religions‚ the summer solstice represents enlightenment‚ and new beginnings. The image of nature as pure is repeated throughout “Summer Solstice‚ New York City” by Sharon Olds. “Summer Solstice‚ New York City” relates the story of a man trying to commit suicide‚ but choosing life and finding comfort in the police sent to rescue him. Initially‚ the title seems
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collect better results by using human cells instead of animals’. Since the products are used on humans‚ why not use human cells? For example‚ in glass testing‚ studying cell cultures in a Petri dish‚ can produce better results than testing animals because human cells would be tested (Rogers). Using the Petri dish to better study human cells is worthwhile. Some scientists use chemicals when working with the animals‚ but in result the outcome is not as accurate as it can be if the scientists used human
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The Relationship Between the Rate of Diffusion and Molecular Weight as Observed in Postassium manganate‚ Potassium dichromate‚ and Methylene Blue Elisha Padilla Group 3 Sec. X – 8L March 26‚ 20151 ABSTRACT The relationship between the rate of diffusion and the molecular weight of a substance was determined by introducing three substances (KMnO₄‚ K₂Cr₂O₇‚ C₁₆H₁₈N₃SCl) of different molecular weight to agar-water gel‚ and measuring the distance of diffusion every
Free Diffusion Molecular diffusion Potassium permanganate