Friday, January 24, 2020

Amyotrophic Lateral Sclerosis Case Study Essay -- Case Study

Case Study: A thirty six year old male has developed severe muscle weakness throughout the body. The condition began fifteen months ago with a left foot drop and within a year, he described difficulty with speech and swallowing, muscle twitching and cramping, and muscular atrophy throughout the upper and lower limbs. Within the last two months, his breathing has become more difficult, and there has been a noticeable difference in his voice. Prior to the fifteen months, he presented little to no symptoms. The patient, a medical doctor, has a wife and two young children. What began as seemingly innocent muscle weakness and cramping has lead to this patient’s fatal diagnosis. He is one of 2.5 per 100,000 people worldwide who have been diagnosed with amyotrophic lateral sclerosis and will mostly likely die of respiratory failure within 2 to 3 years. Amyotrophic lateral sclerosis or ALS is a is a highly degenerative disease involving the nerve cells in the brain and spinal cord that control voluntary movement. The disease is sometimes referred to as Lou Gehrig’s after the New York Yankees baseball player who was diagnosed with ALS in 1939. The disease causes degeneration of upper and lower motor neurons. These neurons connect the brainstem and spinal cord to muscle fibers and send electric impulses to the muscles. Without proper communication, the muscles begin to weaken and atrophy. Individuals with ALS will lose their ability for voluntary muscular control. Usually, bladder and bowel control are spared, though this is not always the case. Cognitive functions and sensory nerves are also typically spared, but the affected individuals may present symptoms of dementia. Initial symptoms generally include muscular weak... ...ological degeneration could happen in such a swift manner. I only hope that a better understanding of the causes of ALS can help find a cure. Works Cited ALSInfo: Lou Gherig’s Disease (ALS) [Internet]. 2011. Sanofi aventis US LLC; [last updated 2011 November 8; cited 2012 March 22]. Available from http://www.alsinfo.com/ Hayes SM. 2001. Amyotrophic Lateral Sclerosis: Update on Anatomy, Physiology, Pharmacology, and Management. In: Riolo L, editor. Topics in Physical Therapy: Neurology. American Physical Therapy Association. Lesson 9. McKinley MP, O'Loughlin VD. 2006. Nervous System Disorders. In: Wheatley CH, editor. Human anatomy. 2nd ed. Boston (MA): McGraw-Hill Higher Education. p 431. Umphred DA. 2001. Amyotrophic Lateral Sclerosis. In: Allen A, Zipperlen R, editors. Neurological rehabilitation. 4th ed. St. Louis (MO): Mosby. p 363-385.

Thursday, January 16, 2020

Chem 101 Lab Report 2 Essay

Mixtures are made up of substances or components. If the mixture is fairly uniform in composition, properties, and its overall appearance, it is homogenous. If the component parts are clearly separated, it is heterogeneous. In order to identify the components in a mixture, methods must be used to sort out the components. However, the same methods will not work for sorting all substances. Four different processes would be employed to sort soluble and insoluble components in the following experiment. Introduction Matter that people encounter in everyday life consists of mixtures of different substances. Mixtures are combinations of two or more substances in which each substance retains its own chemical identity and therefore the original properties are maintained. The substances making up a mixture are called its components. According to our General Chemistry book, there are two types of mixtures; homogeneous and heterogeneous. Homogeneous mixtures are those that are uniform in composition, properties, and appearance throughout. Heterogeneous mixtures do not have the same composition, properties and appearance. Mixtures are characterized by two different properties: each of the substances in the mixture retains its chemical identity and mixtures are separable into these components by physical means, from heating, freezing, drying, etc. If one of the substances in a mixture exceeds the amounts of the other substances in the mixture you call it an impure substance and the other substances in th e mixture are impurities. The preparation of compounds usually involves their separation or isolation from reactants or other impurities. The separation of the components of mixtures is based upon the fact that each component has different physical properties. The components of mixtures are always pure substances, either compounds or elements and each pure substance will possess a unique set of properties. Similarly, every crystal of a pure substance melts at a specific temperature and a given pressure, and every pure substance boils at a specific temperature and a given pressure. There are four different methods of separation depending upon differences in physical properties. They are decantation, filtration, extraction, sublimation. In decantation, a liquid is separated from a solid by gently pouring the liquid from the solid so the only the solid remains in the container. Filtration is the process of separating a solid from a liquid by using a porous substance (a filter). Filtration allows the liquid but not the solid to pass through, again, leaving behind the insoluble substance. Extraction separates a substance from a mixture by choosing to dissolve that substance in a suitable solvent (usually water). Sublimation happens when a solid passes directly to the gaseous state and back to the solid state without passing through the intermediary liquid state. Material and Methods ï‚ · Evaporating Dish ï‚ · Beaker ï‚ · 3.0 Grams of mixture (NH4Cl – ammonium chloride, NaCl – sodium chloride, SiO2 – silicon dioxide) ï‚ · Heat plate ï‚ · Balance ï‚ · Oven ï‚ · Stirring rod ï‚ · 15 mL water x 2 = 30 mL water 1. Obtain mass of evaporating dish. 2. Add 3.0 grams of mixture (NH4Cl – ammonium chloride, NaCl – sodium chloride, SiO2 – silicon dioxide) to the evaporating dish and weigh to obtain mass of evaporating dish and sample mixture. 3. Subtract mass of evaporating dish from mass of original sample to get mass of original sample. 4. Place dish with sample onto heat plate to sublime the NH4Cl. 5. Remove from heat to cool mixture then weigh again. The difference in mass of evaporating dish and sample prior to heating and after heating represents the amount of NH4Cl in the mixture. 6. Obtain mass of beaker using the balance. 7. Add 15 mL of H20 to the mixture in the evaporating dish and stir gently 8. Decant the liquid into the beaker making sure not to transfer any of the solid into the beaker. 9. Add another 15 mL of H20 to the mixture in the evaporating dish and stir gently. Decant the liquid again into the beaker making sure not to transfer any of the solid into the beaker to extract NaCl. 10. Place beaker with sodium chloride solution onto heat plate and heat until water evaporates. Remove from heat and allow to cool. Weigh beaker. Difference between this weight and the weight of the empty beaker is the amount of NaCL in the mixture. 11. Take evaporating dish with SiO4 and heat until dry in oven. Once dry, remove evaporating dish from oven and allow to cool. Obtain the mass of SiO2 by weighting the evaporating dish with cooled mixture and subtracting mass of empty evaporating dish obtained earlier. 12. Find percent of NH4Cl, NaCl, and SiO2 in mixture by taking mass of each substance and dividing by the mass of the original sample. Results: Separation of the Components of a Mixture A. Mass of Evaporating Dish and Original Sample 41.606 g Mass of evaporating dish 38.859 g Mass of original sample 2.747 g Mass of evaporating dish after subliming NH4Cl 41.466 g Mass of NH4Cl 0.14 g Percent of NH4Cl 5.096 % % NH4Cl = 0.14 g / 2.747 g * 100% = 5.096 % B. Mass of Evaporating Dish, Watch Glass and NaCl 106.521 g Mass of evaporating dish and beaker 105.214 g Mass of NaCl 1.307 g Percent of NaCl 45.32 % % NaCl = 1.307 g / 2.747 g * 100% = 45.32 % C. Mass of Evaporating Dish and SiO2 40.104 g Mass of evaporating dish 38.859 g Mass of SiO2 1.245 g Percent of SiO2 45.322 % % SiO2 = 1.245 g / 2.747 g * 100% = 45.322 % D. Mass of Original Sample 2.747 g Mass of determined (NH4Cl + NaCl + SiO2) 2.692 g Differences in these weights 0.055 g Percent recovery of matter 97.997 % % recovery of matter = 2.692g /2.747g = 97.997 % Account for our errors about 2% Discussion The first step in the experiment required using the oven to heat the mixture, with ammonium chloride, sodium chloride, and silicon dioxide in the evaporating dish, until â€Å"white fumes were no longer form[ed],† according to the lab description. The goal was to sublimate the ammonium chloride, as it is not water soluble. It took about fifteen minutes to sublimate the NH4Cl. The dish had to cool as well when it came out of the oven. The mass of the dish contents were weighed and subtracted from the mass off the starting mass of the dish and the original mixture. The result was the loss of NH4Cl. Errors could have resulted from incorrectly weighing the original and ending samples. If ample time was not given to the sublimating process, NH4Cl may not have completely left the dish, the weight would not just include the mass of the other two substances. The next stage required careful decantation and stirring to remove only the liquid into a separate dish. The goal was to leave b ehind the insoluble substance, sand, and pour off the soluble NaCl. It was possible to accidentally remove particles of sand into the solution, which would influence the mass calculation of the two dishes. If stirring was not rigorous enough and water was not repeatedly added to sort out the sand from the liquid, there was a potential for sand staying behind as well. The final stage was to use the heating unit to evaporate the water from the solution to leave behind NaCl. At the same time, the heating unit was used to dry the sodium chloride in another dish. A calculation was made between the mass of the empty evaporating dish and the watch glass to reveal the mass of NaCl. Errors at this stage probably resulted from inaccurate readings on the scale or not drying the samples completely. The final stage of the experiment was to isolate the sand and calculate its mass. By this late stage, any errors in measurement, timing and calculations would have trickled down to the final remaining substance. The percentage of accuracy of the three components in the experiment should total 99%. If the percentage was less than that, â€Å"you have been sloppy† according to the lab manual. Conclusion In this experiment, it became apparent that what appears to be a simple mixture of elements is really more complicated. Heterogeneous mixtures may appear to be random collections of single substances, but when they are sorted into their components, the homogeneous elements can be observed. This was the case with this experiment. The original mixture had three substances: NaCl, NH4Cl, and SiO2. By using four methods, decantation, filtration, extraction, and sublimation, the separate components in the mixture could be isolated and weighed. If proper techniques in weighing, and using the four methods of sorting were observed and applied, the result would be three separated substances and calculations that matched those substances. The final calculation confirmed that our three substances, when sorted out, would all combine to weigh something close to the original mixture. The margin of error was within 2% References Book: 1.Ebbing, Darrel, D.; Gammon, Steven D. General Chemistry. 9th ed. Belmont, CA: Brooks/Cole Cenage Learning; 2009. 2. Beran, JA; Beran,JoAllen: Laboratory Manual for Principles of General Chemistry. 8th ed. Hoboken, NJ. Jon Wiley & Sons, Inc; 2009. 3.Katz, John C.; Treichel, Paul M.; Townsend, John. Chemistry and Chemical Reactivity. Belmont, CA: Cengage Learning, Inc.; 2009. 4.Somervill, Barbara A. Mass and Weight. Chicago, IL: Capstone Global Library, Ltd.; 2010. Electronic book: Chem Wiki:The Dynamic Chemistry Textbook. http://chemwiki.ucdavis.edu/Analytical-chemistry-html. Accessed August 29, 2013. Website: 1.Measuring Mass-Examples. http://www.harpercollege.edu/tm-ps/chm/100/dgodambe/the disk/labtech/mass2.html. 2.Jefferson Lab. http://education.jlab.org/qa/mass-09.html.

Wednesday, January 8, 2020

Police Officers And The Code Of Silence - 978 Words

A study conducted by The Police Foundation surveyed 80 police officers regarding their power of authority. The survey revealed that the majority of police officers disapprove the use of excessive force. However, when situations escalate to a certain point that requires excessive force, police were asked a series of questions. They were asked questions about their attitudes regarding excessive force and their perceptions of behavior with their fellow officers. The results showed that, â€Å"Almost 25 percent felt that it is sometimes acceptable to use more force than legally allowable to control a person who physically assaults an officer (Weisburd, 24).† The survey asked police officers a question that dealt with The Code of Silence, when a police officer sees misconduct from another officer and does not report it. The response of the survery revealed that â€Å"80 percent of American police do not accept that the code of silence is an essential part of the mutual trust neces sary to achieve good policing (Weisburd, 26).† When asked about the attidues of civilians of a different race, the survey results came back as, â€Å"Almost 2 in 10 police officers in the U.S. believe that whites are treated better than African Americans and other minorities (Weisburd, 30).† Is there an issue of racism or targeting certain races when it comes to police and their authortity? A current theme that has been expressed that ties in with police brutality is racism. One case study from The Journal of AfricanShow MoreRelatedThe Unwritten Code1350 Words   |  6 PagesThe Unwritten Code The Police â€Å"Code of Silence† is an unspoken rule among many police agencies in the country. 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