used to confirm the fermentation were a gas production test‚ pH test‚ Gram stain‚ and turbidity test. The results showed during the conversion of milk to Kefir there was gas produced‚ a decrease in pH‚ more bacteria present‚ and an increase in absorbency. The results proved that fermentation occurred with three positive confirmatory results from the gas production‚ pH‚ and turbidity tests‚ while the Gram stain test acted as a negative confirmatory test. Introduction: The main goal of this experiment
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considered to be unknown since the specific ligand amounts are unknown. By determining the percent composition of various elements and compounds in the unknown‚ its true identity can be predicted. Chloride‚ ammonia‚ and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns. Titrations using Na2S2O3 and HCl to determine percent cobalt and ammonia‚ respectively‚ are used. Silver nitrate is used to precipitate the chloride ions in the unknown‚ which
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the factors involved. To say that the conditions ‘obviously’ influenced that outcome is too broad of a statement considering we weren’t there to see most of earth’s evolution take place. In the introduction‚ Gauge assumed that either tryptophan negative‚ or weak tryptophan positive genes would survive in a tryptophan-free environment. Gauge was proved correct when one of the E.coli strains carrying the mutated tryptophan gene was unable to grow. However‚ one of the mutated E.coli genes was proved
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Concentration on Absorbance Background Information The purpose of the “Determining Solution ‘Concentration’ Using A Spectrophotometer” lab was to use a spectrophotometer to find the relationship of concentration and absorbance obeying the Beer-Lambert law‚ which states concentration and absorbance are directly related‚ to then further determine the concentration of three unknown solutions. With the assumption that the solutions obey the Beer-Lambert law it is predicted that as concentration increases‚ absorbance
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Alka-Seltzer Rocket Formal Lab Report Abstract In the Alka-Seltzer Rocket lab one was to experimentally determine how much (grams) Alka-Seltzer and water in mL‚ is needed to launch the rocket the highest/longest distance in cm. Also to experimentally determine the % NaHCO3 in the tablet using the information from the highest/longest distance. Calculate the error and % error of NaHCO3 in an Alka-Seltzer tablet and to determine the limiting reagent for the highest/longest distance traveled. Alka-Seltzer
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Caroline Guidry Dr. Beverly A. Clement Organic Chemistry 2423‚ Section 304 25 October 2017 Lab 6: Natural Products I The main goal of this experiment was to employ isolation techniques to derive chemicals from two different natural sources and study their properties (Clement 91). The two natural sources used in this experiment were an orange (the peel contains limonene‚ which is a terpene) and a dichloromethane solution of clove oil (which contains eugenol‚ an acetogenin). To isolate the eugenol
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If sodium chloride is added to a solution with Saccharomyces cerevisiae‚ then sodium chloride should hinder the growth and reproduction of those cells because the salt concentrations will limit the overall efficiency of the cell’s reproductive processes as well as decrease overall colony size. In our experiment‚ we plan to note the effects of salt on S. cerevisiae by both spot plating to note overall cell colony size and the number of total cells and through the use of electro photometry to also
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Microbiology Sec 147848 November 18‚ 2013 Title of the Experiment: Enterobacteriaceae Identification: The Enterotube II System Learning Objectives: After completing this exercise we were able to inoculate an unknown bacterium that belongs to the Enterobacteriaceae by using technology effectively with a Enterotube II. An Enterotube II is a miniaturized multi-test system for rapid identification of enterbacteriaceae. We then evaluated the test results and generated a five-digit code for the unknown
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Hugh Kim Lab Report: Stoichiometry Lab 1. Prelab Part1. 1) Create no waste = The principle that encourages chemists to not create waste at the first place rather than cleaning it up afterwards effectively shifts the chemistry more environmentally conscious‚ as creating no waste would make the experiment efficient; the reactants will be reduced to only the essential ones and the product will be maximized‚ a change that would make the experiment economic. Also‚ if chemists aim to
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Increasing evidence suggests that the alarming rise in allergic and autoimmune disorders during the past few decades is at least partly attributable to our lack of exposure to microorganisms that once covered our food and us. As nature’s blanket‚ the potentially pathogenic and benign microorganisms associated with the dirt that once covered every aspect of our preindustrial day guaranteed a time-honored co-evolutionary process that established “normal” background levels and kept our bodies from overreacting
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