Calibration of Micropipette and Peristaltic Pump By: Andrew Tam Part 1 – Calibration of Micropipette Results and Discussion: We took a micropipette and pipetted out water of volumes 100, 250, 500, 750, and 1000 uL at specific temperatures (for our experiment, our temperature was 22.9oC) and recorded the mass of the water that was ejected from the micropipette in five trials for each setting. We then convert this value back into uL in order to compare the amount delivered […]
Determination of Chloride in an Unknown Salt By Diane Krehbiel Abstract: In this experiment, the chloride content of an unknown salt will be determined using two different methods. The first method used will be the Fajan titrimetric method which uses an adsorption indicator. The second method will use gravimetric analysis to determine chloride content. The results from both methods were very similar have average mass percent’s of 28.34% and 26.79%. This seems to indicate that the content in chloride found […]
Abstract Planaria Dugesia and Annelid Lumbriculus were observed in three different solutions (freshwater, 2.5mM locostatin, and 2.5 mM colchicine) after being cut in half sagittally. The purpose of this experiment was to test the significance of the worms’ environment on their regeneration process. Over the course of ten days, all worms in colchicine eventually died while both species of worms in freshwater and in locostatin solution survived and successfully completed regeneration. The results are significant because it exemplifies that regeneration […]
Measuring Respiration of Germinating and Non-germinating Peas By: Krunal Patel Introduction Living cells require transfusions of energy from outside sources to perform their many tasks – for example, assembling polymers, pumping substances across membranes, moving, and reproducing (Campbell, and Reece 162). Heterotrophs obtains its energy for its cells by eating plants that makes it own food (Autotrophs); some animals feed on other organisms that eat plants. The most beneficial catabolic pathway in an organism is cellular respiration, in which oxygen […]
Sharpless Epoxidation In 2001 the Nobel Prize in Chemistry was awarded to K.Barry Sharpless, and shared with William S.Knowles, and Ryōji Noyori for their work on asymmetric oxidations. Epoxides are highly useful intermediates in organic synthesis, since these undergo ring opening on attack by a wide variety of nucleophiles. The regioselectivity of the ring –opening reaction is controlled by the nucleophile, the size and electronic nature of the atoms or groups on the carbon atoms of the epoxy ring […]
By: Daniel Jenkinson Abstract It was determined that the wavelength of fluorescence of PRODAN is lengthened in a more polar solvent, or when complexed in a cyclodextrin, since the energy difference between the ground and excited state is lowered due to stabilisation from polar groups. When using β-cyclodextrin, a 1:1 stoichiometry is adopted, but when using γ-cyclodextrin, a 2:1 ratio of PRODAN: cyclodextrin is preferred. The equilibrium constant for bonding with β-cyclodextrin was 8500 M-1, and the product of the […]
