Over the course of this lab, I was surprised to learn that many household substances didn’t have the pH I originally expected them to. Of course, items like windex or vinegar that fall into the typical definition of acidic or basic items weren’t that shocking, but many other substances such as nail polish, shampoo, mouthwash, and hairspray defied my expectations. For example, I had anticipated that hairspray would be more acidic, but the pH strip immediately turned a dark green, identifying as having
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Joyce Seo November 7, 2012 The Regeneration of Differently Cut Fragments of D. dorotocephala in a Solely Spring Water Medium Introduction: Planaria are free-living flatworms in the phylum Platyhelminthes that mainly live in fresh water, but can be found in the ocean as well as the soil. They all have a similar morphology that consists of a small, flat, bilateral body with a single orifice which functions as both the mouth and anus (Steinbach, 1962). They are usually hermaphroditic species that
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I wasn’t aware of how much gas explosions in WWI affected the soldiers. I knew they used them, but I didn’t know about all of the facts behind the poison. These chemicals were forbid at both The Hague Declaration and Convention. Since Germany was the leading the world in science, the chemists were experimenting with different combinations of chemicals to make lethal gases. Scientists were also curious on the effects these chemicals would have on the battlefield. Considering these gases were outlawed
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This paper will analyze the six hypothesizes made on the ways enzymes work. It also will give information on the role of substrates and how it affects enzymes. In the first experiment, we examined whether or not the speed of the reaction will be influenced positively by an increase of heat to a point where it will not be denatured, but negatively by a decrease of heat. In the second experiment we looked to see if the speed is influenced positively by an increase of enzymes to a point, but negatively
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Problem/Question- Will exposing the planarian to various substances affect their appetite and food consumption? Tools/Materials- Multiple planarians 1% Sucrose 1% Alcohol 1% and 10MM Nicotine Spring Water Planarian food (egg yolk of a boiled egg) Petri dishes Dropping pipette Timer Tape (optional) for labeling the petri dishes Pen Observation notebook Camera (optional) Hypothesis- If the planarians are exposed to stimulants, then their appetites will increase. However, when exposed to depressants
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Enzymes are proteins that are made by living cells. They act as catalysts, speeding up the chemical reaction process, remaining unchanged before and after. They do so by lowering the activation energy, meaning when they are present, less energy is required for the reaction to occur. The enzymes act on a substrate during the process. A substrate is any compound the enzyme bonds with. However, the substrate must match a specific shape for the two to bond properly. This is known as the key and lock
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Through the results of this experiment, the effects of three over the counter allergy medications on heart rate of a Daphnia magna were able to be explored. As hypothesized, Benadryl significantly reduced the heart rate of the water flea after a period of two minutes - a 29% decrease in fact. The water flea also experienced an uneven heart rate and slowed movements. Since diphenhydramine does not discriminate between which histamine receptors that it blocks, the H3 receptors that prevent sleep
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Introduction Temperature is one of the key environmental factors that affects the survival and reproduction of living organisms. There are certain temperature ranges on which reactions inside a living thing would perform optimally and its performance would decrease as the temperature deviates from that range. The measurement of heart rate can be considered as an indicator of the performance for many living things. Licht et al [1965] studied the effect of temperature on the capacity of performing
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Chronotopic drugs are able to affect the heart rate in a positive or negative way. Positive additives would increase the heart rate where negative additives would decrease heart rate. In order to compare the difference of certain chemicals on heart rate, a lab testing the effects on a daphnia magna will be performed. A daphnia magna is a flea that lives in water. Five different commonly used solutions will be ingested by five different daphnia magna. These agents affect daphnia magna much like they affect
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Serratia marcescens, Micrococcus roseus, Micrococcus luteus, Sarcina lutea, Staphylococcus epidermidis, Alcaligenes faecalis, Pseudomonas fragi, and Escherichia coli. The goal of this experiment is to use scientific method by demonstrating proper lab techniques, observing and collecting data, then analyzing results to
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