Biochemical Action of Bacteria

To observe the growth of different bacteria species in term of structures and its morphology based on different chemical substance applied. 3. To observe physiological and immunological properties utilized by different species of bacteria. INTRODUCTION: Bacteria biochemical testing can determine the types and numbers in terms of colony forming units of bacteria present in a sample of different chemical. The testing could be focused on a specific type of bacteria, medical bacteria or a broad range of environmental bacteria. Since bacteria are present in virtually any environment, it’s important to be clear why the testing is being performed. The more specific the testing is the better and the easier it is to interpret the results. Numbers and types of bacteria that should be a cause for concern depends upon several factors, including the type of bacteria present and the type of samples. Escherichia coli  are one of the main species of bacteria living in the lower intestines of mammals. E. coli  can be found in the intestinal tract of warm-blooded animals. The presence of  E. coli  in foods is considered to be an indication of fecal contamination. Staphylococcus  organisms are commonly found in the environment. Several species of  Staphylococcus  are found on the skin, intestines, nasal passages, etc. of warm-blooded animals. Some species of  Staphylococcus, particularly  Staphylococcus aureus  can be pathogenic are capable of causing illness. Pseudomonas aeruginosa is widely distributed in soil, water and plants. It survives in hot tubs, whirlpools, contact lens solution, sinks and showers. It can cause a number of opportunistic infections including infections of the skin, external ear canal and of the eye. Nitrifying bacteria recycle organic nitrogenous materials from ammonium (the endpoint for the decomposition of proteins) to nitrates. Their presence can indicate that the water may have been polluted by nitrogen-rich organics from sources such as compromised septic tanks, sewage systems, industrial and hazardous waste sites and is undergoing an aerobic form of degradation. The presence of denitrifying bacteria can indicate that the water has been polluted by nitrogen-rich organics from sources such as compromised septic tanks, sewage systems, industrial and hazardous waste sites. MATERIALS: 1. Nutrient broth cultures of Escherichia coli . Nutrient broth cultures of Serratia marcescens 3. Nutrient broth cultures of Salmonella typhimurium 4. Nutrient broth cultures of Bacillus subtilis 5. Nutrient broth cultures of Klebsiella spp. 6. Nutrient broth cultures of Streptococcus spp. 7. Nutrient broth cultures of Staphylococcus aurieus 8. Nutrient broth cultures of Proteus vulgaris 9. Nutri ent broth cultures of Pseudomonas fluorescens 10. Parafilm tape 11. Inoculating loops 12. Gloves 13. Incubator 14. Nutrient agar plate 15. Nutrient agar slants 16. Starch agar plates 17. Gelatine agar plates 18. 2 tubes Clark’s-Lub medium (MR-VP medium) 19. Tryptone broth 20. 3 Kigler’ slant 21. 5 tubes nitrate broth ( 0. 1% KNO3) 22. 5 urea broth 23. Tube containing 10ml of sterile saline 24. Glucose broths with Durham tubes and phenol red indicator 25. Lactose broths with Durham tubes and phenol red indicator 26. Sucrose broths with Durham tubes and phenol red indicator 27. Gram’s iodine 28. Kovac’s indol reagent 29. Mercuric chloride solution 30. KOH-creatine solution or 40% KOH 31. FR reagent 32. Nessler’s reagent PROCEDURE: A. CARBOHYDRATE METABOLISM 1. Fermentation of sugars Materials: 1. Glucose broths with Durham tubes and phenol red indicator 2. Lactose broths with Durham tubes and phenol red indicator 3. Sucrose broths with Durham tubes and phenol red indicator 4. 18 hour nutrient broth cultures of E. coli and S. typhimurium Procedure: 1) The small bottles of different sugars were inoculated with a loopfuls of E. coli and Salmonella spp. 2) The tubes were labelled and incubate at 37oC for 24 hours 3) All observations were recorded for presence of acid or gas production. 2. Hydrolysis of starch Materials: 1. Starch agar plates 2. Broth agar cultures of B. subtilis and E. coli Procedure: 1) Starch plate was streaked with E. coli in for sections and repeated for B. ubtilis bacteria in other starch plate. 2) The plates were secured with parafilm, labelled and inoculated at 37oC for 24 hours. The following day 1) The plates were tested for starch hydrolysis by flooding the pates with Gram’s iodine. 2) The plates were examined and the colonies that showed clear uncoloured zones in contrast with the blue-black background of the starch-iodine complex were noted. 3) The extent of the zones of hydrolysis indicated either the reddish colour zones were seen. 4) All results and observations were recorded. B. PROTEIN AND AMINO ACID METABOLIM 1. Indole test Materials: 1. Broth cultures of B. ubtilis, E. coli, and S. typhimurium 2. 3 tubes of tryptone broth 3. Kovac’s indole test reagent Procedures: 1) The peptone water was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incubated for 24 hours. The following day 1) The tubes were added with a few drops of Kovac’s indole reagent (dimethylaminobenzaldehyde) 2) The red or dark color indicates the presence of indole. 4. Hydrogen sulphide Materials: 1. Broth cultures of B. subtilis, E. coli, and S. typhimurium 2. 3 Kigler’s slant Procedures: 1) The Kigler’s slant was inoculated with a loopfuls of the test organism by the stab method. ) The tube was labelled and incubated for 24 hours. The following day 3) Th e Kigler’ slant was observed for production of H2S where the black precipitate along the line of growth in the Kigler’s slants indicated the H2S have been produced. 4) The observations were recorded. 3. Gelatine hydrolysis test Materials: 1. Broth cultures of B. subtilis, E. coli, and S. typhimurium 2. Gelatine agar plates 3. Mercuric chloride solution Procedures: 3) The gelatine agar plates were inoculated with a loopfuls of the test organism with a single streak at the centre of the plates. ) The plates were secured with parafilm, labelled and incubated for 24 hours. The following day 5) The plates were flooded with mercuric chloride solution. 6) The medium become opaque in regions that still contain gelatine and clear regions where gelatine has been hydrolysed. C. VOGES-PROSKAUER TEST Materials: 1. Broth cultures of E. coli, and Klebsiella spp. 2. 2 tubes of Clark-Lub’s medium (MR-VP medium) 3. KOH-creatine solution Procedures: 1) The tubes of Clark-Lubâ€⠄¢s medium (MR-VP medium) were inoculated with a loopfuls of the test organism. 2) The tubes were labelled and incubated for 24 hours. The following day 1) The tubes were tested with Voges-Proskauer test. 2) The 0. 5ml of KOH-creatine solutuin was addd. 3) The tube was shaked vigorously for 30 seconds. 4) The red or pink color indicates the presence of acetoin. D. CATALASE TEST Materials: 1. Broth cultures of Streptococcus spp. and Staphylococcus aureus. 2. Nutrient agar slant Procedures: 1) The nutrient agar slant was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incubated for 24 hours. The following day 1) The tubes were tested with catalase test by adding several drops of a 5% solution of hydrogen peroxide. ) The vigorous bubbling indicates the presence of oxygen. E. NITRATE REDUCTION TEST Materials: 1. Broth cultures of E. coli, Proteus vugaris, Serratia marcescens, Pseudomonas fluorescens. 2. 5 tubes containing nitrate broth (0. 1% KNO3) 3. Nitrate test reagent Procedures: 1) The nitrate broth was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incub ated for 24 hours. The following day 1) The tubes were tested with 1ml of Follet and Ratcliff’s (FR reagent) 2) The orange or brown color indicates the presence of nitrate. 3) The absent of nitrate indicates that: a. There has been no nitrate reduction b. The reduction has proceeded beyond that nitrate stage. 4) The absent of orange or brown color were further tested with small amount of cadmium to the tube. If nitrate still present, it will be catalytically change to nitrate which will then reacts with the FR reagent in the tube. 5) In the absent of a positive nitrate result, the bubbles f H2 gas was observed in the Durhams tube OR 6) The samples were tested with 1ml of Nessler’s reagent. The brown or orange color indicates the presence of ammonia. F. UREASE TEST Materials: 1. Broth cultures of E. coli, P. vugaris, S. arcescens, P. fluorescens. 2. 5 urea broth with indicator Procedures: 1) The urea broth was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incubated for 24 hours. The following day 1) The urease-positive organism produced in intense red/purple coloration of the medium after incubation. 2) All observations were recorded. RESULTS AND OBSERVATION: Test| Observation(After 24 hours incubation)| Description| A. Carbohydrate Test 1. Fermentation of starchDurham tubes and phenol-red indicator. 2. Hydrolysis of starch| Glucose: Lactose: Sucrose: Starch agar plates:B. ubtilisE. coli| * Positive result for E. coli as tube turn yellow * Positive result for S. typhimium as tube turn yellow * Positive result for E. coli as tube turn yellow * No gas produced by S. typhimium because the tube turns red. * No gas produced by E. coli because the tube is slightly red. * Positive result for S. typhimium as tube turn yellow * Positive zone of clearing. * Negative zone of clearing. | B. Protein And Amino Acid Metabolism 1. Indole test 2. Hydrogen disulphide 3. Gelatine hydrolysis test| Tryptone broth:B. subtilisE. coli. S. typhimuriumKigler’s slant:B. subtilisE. oli. S. typhimuriumGelatine agar plates:B. subtilisE. coli. S. typhimurium| * Negative Indole tests no color change. * Bright fuschia at the interface is positive test for Indole . * Negative Indole tests no color change. * Black precipitate form shows positive sulphur reduction. * Negative reaction. * Positive reaction forming the black precipitate. * Positive hydrolysis of gelatine into amino acid to be used as nutrients/gelatinase. * Negative hydrolysis of gelatine. * Negative hydrolysis of gelatine| C. Voges- Proskaeur’s Test| MR-VP medium:E. coli. Klebsiella spp. | * Negative results of E. oli * Positive results Klebsiella spp. | D. Catalase Test| Nutrient agar slant:S. aureusStreptococcus spp. | S. aureus * Positive catalase reaction because present of bubblesStreptococcus spp. * Negative catalase reaction no bubbles present. | E. Nitrate Reduction Test| Nitrate broth:E. coliP. vulgarisS. marcescensP. fluorenscens| * No color change after denitrification of ammonia. * No color change after denitrification of ammonia. * Turns red. Positive nitrate test shows nitrate reductase present. * Turns red but negative catalase test. | F. Urease Test| Urea broth:E. coliP. vulgarisS. marcescensP. luorenscens| * Negative urease test because the tube remain purple. * P. vulgaris show positive urease test from yellow to pinkish. * S. marcescens show negative urease test because the color remain purple. * P. fluorenscens show negative urease test because the color remain purple. | DISCUSSION: Biochemical tests of bacteria oobjectively to test the metabolism of carbohydrate and related products of different bacteria species, test specific breakdown of products through color changes and gas produced. Besides that, the ability of bacteria utilizes a specific substance and the metabolism of protein and amino acid by bacteria. A. CARBOHYDRATE TEST Carbohydrate is an organic compound that consists of only carbon, hydrogen and oxygen which is basically the major carbon source of most organisms. Specific carbohydrate can be fermented by organism that incorporated in a medium producing red or acid with gas. Pinkish red color shows positive results where acidic content formed in the tube because carbon dioxide realised if fermentation occur. Negative catabolism of carbohydrate shows by yellow to colourless of Durham’s tube as the solution remain alkaline in the absent of carbon dioxide gas. Gas production can be seen as bubbles in Durham’s tube. Central carbohydrate metabolism or the breakdown of sugars into smaller compounds accompanied by the production of ATP and reduction of coenzymes, follows one of several pathway. Carbohydrate utilization and fermentation will be assessed by growing cells without shaking (aeration) in defined media containing a single carbohydrate. Acid products of sugar fermentation will cause a noticeable color change in the pH indicator included in the medium. Sugar fermentation does not produce alkaline product, however non-fermentative hydrolysis of amino acids in the peptone, present in most fermentation media, may give an alkaline reaction, which will also cause a color change in the pH indicator. Gas production, H2 in particular, can be determined by placing a small, inverted Durham tube in the test medium. If gas is produced, it is trapped in the Durham tube and can be seen as a bubble. Hydrogen sulfide (H2S) is produced by bacterial anaerobic degradation of the two sulfur-containing amino acids, cysteine and methionine. Hydrogen sulfide is released as a by-product when carbon and nitrogen atoms in the amino acids are consumed as nutrients by the cells. Under anaerobic conditions the sulfhydryl (-SH) group on cysteine is reduced by cysteine desulfurase. Ferrous ammonium sulfate-indicator. H2S reacts with ferrous sulfate forming the black precipitate Sodium thiosulfate is reduced to sulphite/thiosulfate The Kligler’s Iron test is used to detect liberation of H2S gas by bacteria growing on an excess of these sulfur-containing amino acids. The agar contains high levels of peptones or sources of cysteine and methionine and ferrous sulfate as an indicator. When H2S is produced, the ferrous ion reacts with it to give ferrous sulfide, an insoluble black precipitate. In starch hydrolysis test Iodine must be on the plate to visualize the zone of clearing surrounding the bacteria. This zone indicates starch was broken down to dextrins, maltose, and glucose. B. PROTEIN AND AMINO ACID METABOLIM Indole test measures the ability of bacteria to split indole from tryptophan molecule but in term of biochemistry, Indole test is one of the metabolic degradation products of the amino acid tryophan. Bacteria that possess the enzyme trytophanase are capable of hydrolysing and deaminating tryptophan with the production of Indole, pyruvic acid and ammonia. Positive reaction showed by E. coli, P. vulgaris and negative results observed in Klebsiella and Salmonella from observation in the Indole test. Development of fuchsia red color at the interface of the reagent and the broth within seconds after adding the reagent is indicative of the presence of Indole and is a positive test. Kovac’s reagent detects if tryptophan has been hydrolyzed to indol or tryptophanase. Gelatin is the protein derived from the animal protein collagen, has been used as a solidifying agent in food for a long time besides nutrient gelatine as an early type of solid growth medium. One problem is that many bacteria have the ability to hydrolyze or liquefy the gelatin. This gelatin liquefaction ability forms the basis for this test. C. VOGES-PROSKAUER TEST The production of acetoin by bacteria is perform through Voges Proskauer Test to determine the ability of the organisms to produce neutral end product acetyl methyl carbinol (acetoin) from glucose fermentation. Negative results gained from E. coli meanwhile positive reaction gives by. Changing of color to red pinkish color at the surface of the medium indicated positive results and yellow color at the surface of the medium show negative reaction. The KOH reagent should not be excessively added to the sample because excess KOH may mask weak VP positive reactions. The MR test will be positive for organisms that have complete pathways for mixed acid fermentation. The Voges-Proskauer (VP) test determines whether a specific neutral metabolic intermediate, acetoin, has been produced instead of acid from glucose. Acetoin is the last intermediate in the butanediol pathway, which is a common fermentation pathway in B. subtilis. The tests are complementary in the sense that often a bacterium will give a positive reaction for one test and a negative reaction for the other. The three possible patterns of results where the acetoin fermentation pathway, detected by the VP test, two molecules of pyruvate condense and two molecules of CO2 are released. The 4 carbon intermediate that is formed, acetoin, contains a carbonyl group. The acetoin acts as a terminal electron acceptor with the carbonyl group being reduced to a hydroxyl group. The reduced product, butanediol, is excreted by the bacteria and acetoin is oxidized to diacetyl by alkaline -naphthol, which forms a red complex with creatinine. D. CATALASE TEST Catalase is present in most cytochrome containing aerobic and facultative anaerobic bacteria except Streptococcus spp. Hydrogen peroxide forms as one of the oxidative end product of aerobic carbohydrate metabolism. If hydrogen peroxide allowed accumulating in the bacterial cells it becomes lethal to the bacteria. Catalases help in converting H2O2 to water and oxygen. In the catalase test performed, Streptococcus spp gives negative reaction as for S. aureus, the positive reaction occurred. One of the by-products of oxidation-reduction in the presence of O2 during aerobic respiration is hydrogen peroxide (H2O2). This compound is highly reactive and must be degraded in the cytoplasm of the cell producing it. It can be especially damaging to molecules of DNA. Most aerobes synthesize the enzyme catalase, which breaks down H2O2 into water and oxygen. The O2 gas is identified by the production of bubbles from a concentrated cell suspension. The test for catalase is simple and usually very reliable. It is a major method of distinguishing between Staphylococcus (catalase positive), Streptococcus (catalase negative), and Enterococcus (catalase negative), although some strains of Enterococcus faecalis may be positive. Catalase production is generally associated with aerobic organisms, since H2O2 is a toxic by-product of aerobic growth, but not always. E. NITRATE REDUCTION TEST Nitrate reduction test basically test the ability of organism to reduce the nitrate to nitrites of free nitrogen gas. In order to determine either the bacteria can reduce nitrate, the test organism is inoculated into nitrate reduction broth, undefined medium that contains large amounts of nitrate (KNO3). After incubation, reagent added simultaneously reacts with nitrite and turn to red color, indicating a positive nitrate reduction. If there is no color change at this step, nitrite is absent. If the nitrate is unreduced and till in its original form, this would be a negative nitrate reduction result. However it is possible that the nitrate was reduced to nitrite but has been further reduced to ammonia or nitrogen gas. This would be recorded as positive nitrate reduction result. Under anaerobic conditions, some bacteria are able to use nitrate (NO3-) as an external terminal electron acceptor. This kind of metabolism is analogous to the use of oxygen as a terminal electron acceptor by aerobic organisms and is called anaerobic respiration. Nitrate is an oxidized compound and there are several steps possible in its reduction. The initial step is the reduction of nitrate (NO3-) to nitrite (NO2-). Several possible products can be made from further reduction of nitrite. Possible reduced end products include the following N2, NH3 (ammonia), N2O (nitrous oxide). Bacteria vary in their ability to perform these reactions, a useful characteristic for identification. A medium that will support growth must be used and the cells must be grown anaerobically. Growth in the presence of oxygen will decrease or eliminate nitrate reduction. There are many possible end products of nitrate reduction such as nitrite, nitrogen gas (N2), nitrous oxides, ammonia, and hydroxylamine. The disappearance of nitrate or the appearance of the end products. The test relies on the production of nitrous acid from the nitrite. This, in turn, reacts with the iodide in the reagent to produce iodine. The iodine then reacts with the starch in the reagent to produce a blue color. Since some of the possible products of NO3- reduction are gaseous, a Durham tube is sometimes inverted in the culture tube to trap gases. This being the case, it is important to pre-test the medium to ensure no detectable nitrite is present at the beginning, and, in the case of a negative test, to reduce any nitrate to nitrite to determine whether the nitrite was also reduced. If nitrite is produced, it reacts with hemoglobin to give a bright red color, instead of the dark red color of hemoglobin. It is this reaction that is responsible for the color of meats, such as hot dogs, which are preserved with sodium nitrite. The blood agar test has the advantage of no color change occurring if the nitrite is further reduced. F. UREASE TEST Urease test mainly highlighted to determine the ability of the organism to split urea forming 2 molecules of ammonia by the action of the enzyme Urease with resulting alkalinity. Negative reaction shown by E. coli meanwhile Klebsiella spp. shows positive result. Extra precaution needed because both the urease test medium depend upon the demonstration of alkalinity that not specific for urease. Moreover the protein hydrolysis may result I alkalinity hence false positive may be seen in Pseudomonas. The false positivity can be eliminated by control test using the same medium without urea as recommendation. Urea is a nitrogenous waste product of animals. Some bacteria can cleaved it to produce carbon dioxide and ammonia. The ammonia is a nitrogen source for amino acid biosynthesis as well as for synthesis of other nitrogen-containing molecules in the cell. The urease test was devised to distinguish Proteus species from other enterics. The medium described here is buffered enough so that weak urease producers appear negative. The production of ammonia raises the pH of the medium. The indicator phenol red is present in the broth. Phenol red is orange-yellow at pH below than 6. 8, and turns bright pinkish-red at pH higher than 8. 1. Hence, a positive urea test is denoted by the change of medium color from yellow to pinkish red. CONCLUSION: Based on the laboratory, different bacteria species have different abilities to metabolize various substrates and end products formed were able to be observed and distinguished. Biochemical Action of Bacteria To observe the growth of different bacteria species in term of structures and its morphology based on different chemical substance applied. 3. To observe physiological and immunological properties utilized by different species of bacteria. INTRODUCTION: Bacteria biochemical testing can determine the types and numbers in terms of colony forming units of bacteria present in a sample of different chemical. The testing could be focused on a specific type of bacteria, medical bacteria or a broad range of environmental bacteria. Since bacteria are present in virtually any environment, it’s important to be clear why the testing is being performed. The more specific the testing is the better and the easier it is to interpret the results. Numbers and types of bacteria that should be a cause for concern depends upon several factors, including the type of bacteria present and the type of samples. Escherichia coli  are one of the main species of bacteria living in the lower intestines of mammals. E. coli  can be found in the intestinal tract of warm-blooded animals. The presence of  E. coli  in foods is considered to be an indication of fecal contamination. Staphylococcus  organisms are commonly found in the environment. Several species of  Staphylococcus  are found on the skin, intestines, nasal passages, etc. of warm-blooded animals. Some species of  Staphylococcus, particularly  Staphylococcus aureus  can be pathogenic are capable of causing illness. Pseudomonas aeruginosa is widely distributed in soil, water and plants. It survives in hot tubs, whirlpools, contact lens solution, sinks and showers. It can cause a number of opportunistic infections including infections of the skin, external ear canal and of the eye. Nitrifying bacteria recycle organic nitrogenous materials from ammonium (the endpoint for the decomposition of proteins) to nitrates. Their presence can indicate that the water may have been polluted by nitrogen-rich organics from sources such as compromised septic tanks, sewage systems, industrial and hazardous waste sites and is undergoing an aerobic form of degradation. The presence of denitrifying bacteria can indicate that the water has been polluted by nitrogen-rich organics from sources such as compromised septic tanks, sewage systems, industrial and hazardous waste sites. MATERIALS: 1. Nutrient broth cultures of Escherichia coli . Nutrient broth cultures of Serratia marcescens 3. Nutrient broth cultures of Salmonella typhimurium 4. Nutrient broth cultures of Bacillus subtilis 5. Nutrient broth cultures of Klebsiella spp. 6. Nutrient broth cultures of Streptococcus spp. 7. Nutrient broth cultures of Staphylococcus aurieus 8. Nutrient broth cultures of Proteus vulgaris 9. Nutri ent broth cultures of Pseudomonas fluorescens 10. Parafilm tape 11. Inoculating loops 12. Gloves 13. Incubator 14. Nutrient agar plate 15. Nutrient agar slants 16. Starch agar plates 17. Gelatine agar plates 18. 2 tubes Clark’s-Lub medium (MR-VP medium) 19. Tryptone broth 20. 3 Kigler’ slant 21. 5 tubes nitrate broth ( 0. 1% KNO3) 22. 5 urea broth 23. Tube containing 10ml of sterile saline 24. Glucose broths with Durham tubes and phenol red indicator 25. Lactose broths with Durham tubes and phenol red indicator 26. Sucrose broths with Durham tubes and phenol red indicator 27. Gram’s iodine 28. Kovac’s indol reagent 29. Mercuric chloride solution 30. KOH-creatine solution or 40% KOH 31. FR reagent 32. Nessler’s reagent PROCEDURE: A. CARBOHYDRATE METABOLISM 1. Fermentation of sugars Materials: 1. Glucose broths with Durham tubes and phenol red indicator 2. Lactose broths with Durham tubes and phenol red indicator 3. Sucrose broths with Durham tubes and phenol red indicator 4. 18 hour nutrient broth cultures of E. coli and S. typhimurium Procedure: 1) The small bottles of different sugars were inoculated with a loopfuls of E. coli and Salmonella spp. 2) The tubes were labelled and incubate at 37oC for 24 hours 3) All observations were recorded for presence of acid or gas production. 2. Hydrolysis of starch Materials: 1. Starch agar plates 2. Broth agar cultures of B. subtilis and E. coli Procedure: 1) Starch plate was streaked with E. coli in for sections and repeated for B. ubtilis bacteria in other starch plate. 2) The plates were secured with parafilm, labelled and inoculated at 37oC for 24 hours. The following day 1) The plates were tested for starch hydrolysis by flooding the pates with Gram’s iodine. 2) The plates were examined and the colonies that showed clear uncoloured zones in contrast with the blue-black background of the starch-iodine complex were noted. 3) The extent of the zones of hydrolysis indicated either the reddish colour zones were seen. 4) All results and observations were recorded. B. PROTEIN AND AMINO ACID METABOLIM 1. Indole test Materials: 1. Broth cultures of B. ubtilis, E. coli, and S. typhimurium 2. 3 tubes of tryptone broth 3. Kovac’s indole test reagent Procedures: 1) The peptone water was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incubated for 24 hours. The following day 1) The tubes were added with a few drops of Kovac’s indole reagent (dimethylaminobenzaldehyde) 2) The red or dark color indicates the presence of indole. 4. Hydrogen sulphide Materials: 1. Broth cultures of B. subtilis, E. coli, and S. typhimurium 2. 3 Kigler’s slant Procedures: 1) The Kigler’s slant was inoculated with a loopfuls of the test organism by the stab method. ) The tube was labelled and incubated for 24 hours. The following day 3) Th e Kigler’ slant was observed for production of H2S where the black precipitate along the line of growth in the Kigler’s slants indicated the H2S have been produced. 4) The observations were recorded. 3. Gelatine hydrolysis test Materials: 1. Broth cultures of B. subtilis, E. coli, and S. typhimurium 2. Gelatine agar plates 3. Mercuric chloride solution Procedures: 3) The gelatine agar plates were inoculated with a loopfuls of the test organism with a single streak at the centre of the plates. ) The plates were secured with parafilm, labelled and incubated for 24 hours. The following day 5) The plates were flooded with mercuric chloride solution. 6) The medium become opaque in regions that still contain gelatine and clear regions where gelatine has been hydrolysed. C. VOGES-PROSKAUER TEST Materials: 1. Broth cultures of E. coli, and Klebsiella spp. 2. 2 tubes of Clark-Lub’s medium (MR-VP medium) 3. KOH-creatine solution Procedures: 1) The tubes of Clark-Lubâ€⠄¢s medium (MR-VP medium) were inoculated with a loopfuls of the test organism. 2) The tubes were labelled and incubated for 24 hours. The following day 1) The tubes were tested with Voges-Proskauer test. 2) The 0. 5ml of KOH-creatine solutuin was addd. 3) The tube was shaked vigorously for 30 seconds. 4) The red or pink color indicates the presence of acetoin. D. CATALASE TEST Materials: 1. Broth cultures of Streptococcus spp. and Staphylococcus aureus. 2. Nutrient agar slant Procedures: 1) The nutrient agar slant was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incubated for 24 hours. The following day 1) The tubes were tested with catalase test by adding several drops of a 5% solution of hydrogen peroxide. ) The vigorous bubbling indicates the presence of oxygen. E. NITRATE REDUCTION TEST Materials: 1. Broth cultures of E. coli, Proteus vugaris, Serratia marcescens, Pseudomonas fluorescens. 2. 5 tubes containing nitrate broth (0. 1% KNO3) 3. Nitrate test reagent Procedures: 1) The nitrate broth was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incub ated for 24 hours. The following day 1) The tubes were tested with 1ml of Follet and Ratcliff’s (FR reagent) 2) The orange or brown color indicates the presence of nitrate. 3) The absent of nitrate indicates that: a. There has been no nitrate reduction b. The reduction has proceeded beyond that nitrate stage. 4) The absent of orange or brown color were further tested with small amount of cadmium to the tube. If nitrate still present, it will be catalytically change to nitrate which will then reacts with the FR reagent in the tube. 5) In the absent of a positive nitrate result, the bubbles f H2 gas was observed in the Durhams tube OR 6) The samples were tested with 1ml of Nessler’s reagent. The brown or orange color indicates the presence of ammonia. F. UREASE TEST Materials: 1. Broth cultures of E. coli, P. vugaris, S. arcescens, P. fluorescens. 2. 5 urea broth with indicator Procedures: 1) The urea broth was inoculated with a loopfuls of the test organism. 2) The tube was labelled and incubated for 24 hours. The following day 1) The urease-positive organism produced in intense red/purple coloration of the medium after incubation. 2) All observations were recorded. RESULTS AND OBSERVATION: Test| Observation(After 24 hours incubation)| Description| A. Carbohydrate Test 1. Fermentation of starchDurham tubes and phenol-red indicator. 2. Hydrolysis of starch| Glucose: Lactose: Sucrose: Starch agar plates:B. ubtilisE. coli| * Positive result for E. coli as tube turn yellow * Positive result for S. typhimium as tube turn yellow * Positive result for E. coli as tube turn yellow * No gas produced by S. typhimium because the tube turns red. * No gas produced by E. coli because the tube is slightly red. * Positive result for S. typhimium as tube turn yellow * Positive zone of clearing. * Negative zone of clearing. | B. Protein And Amino Acid Metabolism 1. Indole test 2. Hydrogen disulphide 3. Gelatine hydrolysis test| Tryptone broth:B. subtilisE. coli. S. typhimuriumKigler’s slant:B. subtilisE. oli. S. typhimuriumGelatine agar plates:B. subtilisE. coli. S. typhimurium| * Negative Indole tests no color change. * Bright fuschia at the interface is positive test for Indole . * Negative Indole tests no color change. * Black precipitate form shows positive sulphur reduction. * Negative reaction. * Positive reaction forming the black precipitate. * Positive hydrolysis of gelatine into amino acid to be used as nutrients/gelatinase. * Negative hydrolysis of gelatine. * Negative hydrolysis of gelatine| C. Voges- Proskaeur’s Test| MR-VP medium:E. coli. Klebsiella spp. | * Negative results of E. oli * Positive results Klebsiella spp. | D. Catalase Test| Nutrient agar slant:S. aureusStreptococcus spp. | S. aureus * Positive catalase reaction because present of bubblesStreptococcus spp. * Negative catalase reaction no bubbles present. | E. Nitrate Reduction Test| Nitrate broth:E. coliP. vulgarisS. marcescensP. fluorenscens| * No color change after denitrification of ammonia. * No color change after denitrification of ammonia. * Turns red. Positive nitrate test shows nitrate reductase present. * Turns red but negative catalase test. | F. Urease Test| Urea broth:E. coliP. vulgarisS. marcescensP. luorenscens| * Negative urease test because the tube remain purple. * P. vulgaris show positive urease test from yellow to pinkish. * S. marcescens show negative urease test because the color remain purple. * P. fluorenscens show negative urease test because the color remain purple. | DISCUSSION: Biochemical tests of bacteria oobjectively to test the metabolism of carbohydrate and related products of different bacteria species, test specific breakdown of products through color changes and gas produced. Besides that, the ability of bacteria utilizes a specific substance and the metabolism of protein and amino acid by bacteria. A. CARBOHYDRATE TEST Carbohydrate is an organic compound that consists of only carbon, hydrogen and oxygen which is basically the major carbon source of most organisms. Specific carbohydrate can be fermented by organism that incorporated in a medium producing red or acid with gas. Pinkish red color shows positive results where acidic content formed in the tube because carbon dioxide realised if fermentation occur. Negative catabolism of carbohydrate shows by yellow to colourless of Durham’s tube as the solution remain alkaline in the absent of carbon dioxide gas. Gas production can be seen as bubbles in Durham’s tube. Central carbohydrate metabolism or the breakdown of sugars into smaller compounds accompanied by the production of ATP and reduction of coenzymes, follows one of several pathway. Carbohydrate utilization and fermentation will be assessed by growing cells without shaking (aeration) in defined media containing a single carbohydrate. Acid products of sugar fermentation will cause a noticeable color change in the pH indicator included in the medium. Sugar fermentation does not produce alkaline product, however non-fermentative hydrolysis of amino acids in the peptone, present in most fermentation media, may give an alkaline reaction, which will also cause a color change in the pH indicator. Gas production, H2 in particular, can be determined by placing a small, inverted Durham tube in the test medium. If gas is produced, it is trapped in the Durham tube and can be seen as a bubble. Hydrogen sulfide (H2S) is produced by bacterial anaerobic degradation of the two sulfur-containing amino acids, cysteine and methionine. Hydrogen sulfide is released as a by-product when carbon and nitrogen atoms in the amino acids are consumed as nutrients by the cells. Under anaerobic conditions the sulfhydryl (-SH) group on cysteine is reduced by cysteine desulfurase. Ferrous ammonium sulfate-indicator. H2S reacts with ferrous sulfate forming the black precipitate Sodium thiosulfate is reduced to sulphite/thiosulfate The Kligler’s Iron test is used to detect liberation of H2S gas by bacteria growing on an excess of these sulfur-containing amino acids. The agar contains high levels of peptones or sources of cysteine and methionine and ferrous sulfate as an indicator. When H2S is produced, the ferrous ion reacts with it to give ferrous sulfide, an insoluble black precipitate. In starch hydrolysis test Iodine must be on the plate to visualize the zone of clearing surrounding the bacteria. This zone indicates starch was broken down to dextrins, maltose, and glucose. B. PROTEIN AND AMINO ACID METABOLIM Indole test measures the ability of bacteria to split indole from tryptophan molecule but in term of biochemistry, Indole test is one of the metabolic degradation products of the amino acid tryophan. Bacteria that possess the enzyme trytophanase are capable of hydrolysing and deaminating tryptophan with the production of Indole, pyruvic acid and ammonia. Positive reaction showed by E. coli, P. vulgaris and negative results observed in Klebsiella and Salmonella from observation in the Indole test. Development of fuchsia red color at the interface of the reagent and the broth within seconds after adding the reagent is indicative of the presence of Indole and is a positive test. Kovac’s reagent detects if tryptophan has been hydrolyzed to indol or tryptophanase. Gelatin is the protein derived from the animal protein collagen, has been used as a solidifying agent in food for a long time besides nutrient gelatine as an early type of solid growth medium. One problem is that many bacteria have the ability to hydrolyze or liquefy the gelatin. This gelatin liquefaction ability forms the basis for this test. C. VOGES-PROSKAUER TEST The production of acetoin by bacteria is perform through Voges Proskauer Test to determine the ability of the organisms to produce neutral end product acetyl methyl carbinol (acetoin) from glucose fermentation. Negative results gained from E. coli meanwhile positive reaction gives by. Changing of color to red pinkish color at the surface of the medium indicated positive results and yellow color at the surface of the medium show negative reaction. The KOH reagent should not be excessively added to the sample because excess KOH may mask weak VP positive reactions. The MR test will be positive for organisms that have complete pathways for mixed acid fermentation. The Voges-Proskauer (VP) test determines whether a specific neutral metabolic intermediate, acetoin, has been produced instead of acid from glucose. Acetoin is the last intermediate in the butanediol pathway, which is a common fermentation pathway in B. subtilis. The tests are complementary in the sense that often a bacterium will give a positive reaction for one test and a negative reaction for the other. The three possible patterns of results where the acetoin fermentation pathway, detected by the VP test, two molecules of pyruvate condense and two molecules of CO2 are released. The 4 carbon intermediate that is formed, acetoin, contains a carbonyl group. The acetoin acts as a terminal electron acceptor with the carbonyl group being reduced to a hydroxyl group. The reduced product, butanediol, is excreted by the bacteria and acetoin is oxidized to diacetyl by alkaline -naphthol, which forms a red complex with creatinine. D. CATALASE TEST Catalase is present in most cytochrome containing aerobic and facultative anaerobic bacteria except Streptococcus spp. Hydrogen peroxide forms as one of the oxidative end product of aerobic carbohydrate metabolism. If hydrogen peroxide allowed accumulating in the bacterial cells it becomes lethal to the bacteria. Catalases help in converting H2O2 to water and oxygen. In the catalase test performed, Streptococcus spp gives negative reaction as for S. aureus, the positive reaction occurred. One of the by-products of oxidation-reduction in the presence of O2 during aerobic respiration is hydrogen peroxide (H2O2). This compound is highly reactive and must be degraded in the cytoplasm of the cell producing it. It can be especially damaging to molecules of DNA. Most aerobes synthesize the enzyme catalase, which breaks down H2O2 into water and oxygen. The O2 gas is identified by the production of bubbles from a concentrated cell suspension. The test for catalase is simple and usually very reliable. It is a major method of distinguishing between Staphylococcus (catalase positive), Streptococcus (catalase negative), and Enterococcus (catalase negative), although some strains of Enterococcus faecalis may be positive. Catalase production is generally associated with aerobic organisms, since H2O2 is a toxic by-product of aerobic growth, but not always. E. NITRATE REDUCTION TEST Nitrate reduction test basically test the ability of organism to reduce the nitrate to nitrites of free nitrogen gas. In order to determine either the bacteria can reduce nitrate, the test organism is inoculated into nitrate reduction broth, undefined medium that contains large amounts of nitrate (KNO3). After incubation, reagent added simultaneously reacts with nitrite and turn to red color, indicating a positive nitrate reduction. If there is no color change at this step, nitrite is absent. If the nitrate is unreduced and till in its original form, this would be a negative nitrate reduction result. However it is possible that the nitrate was reduced to nitrite but has been further reduced to ammonia or nitrogen gas. This would be recorded as positive nitrate reduction result. Under anaerobic conditions, some bacteria are able to use nitrate (NO3-) as an external terminal electron acceptor. This kind of metabolism is analogous to the use of oxygen as a terminal electron acceptor by aerobic organisms and is called anaerobic respiration. Nitrate is an oxidized compound and there are several steps possible in its reduction. The initial step is the reduction of nitrate (NO3-) to nitrite (NO2-). Several possible products can be made from further reduction of nitrite. Possible reduced end products include the following N2, NH3 (ammonia), N2O (nitrous oxide). Bacteria vary in their ability to perform these reactions, a useful characteristic for identification. A medium that will support growth must be used and the cells must be grown anaerobically. Growth in the presence of oxygen will decrease or eliminate nitrate reduction. There are many possible end products of nitrate reduction such as nitrite, nitrogen gas (N2), nitrous oxides, ammonia, and hydroxylamine. The disappearance of nitrate or the appearance of the end products. The test relies on the production of nitrous acid from the nitrite. This, in turn, reacts with the iodide in the reagent to produce iodine. The iodine then reacts with the starch in the reagent to produce a blue color. Since some of the possible products of NO3- reduction are gaseous, a Durham tube is sometimes inverted in the culture tube to trap gases. This being the case, it is important to pre-test the medium to ensure no detectable nitrite is present at the beginning, and, in the case of a negative test, to reduce any nitrate to nitrite to determine whether the nitrite was also reduced. If nitrite is produced, it reacts with hemoglobin to give a bright red color, instead of the dark red color of hemoglobin. It is this reaction that is responsible for the color of meats, such as hot dogs, which are preserved with sodium nitrite. The blood agar test has the advantage of no color change occurring if the nitrite is further reduced. F. UREASE TEST Urease test mainly highlighted to determine the ability of the organism to split urea forming 2 molecules of ammonia by the action of the enzyme Urease with resulting alkalinity. Negative reaction shown by E. coli meanwhile Klebsiella spp. shows positive result. Extra precaution needed because both the urease test medium depend upon the demonstration of alkalinity that not specific for urease. Moreover the protein hydrolysis may result I alkalinity hence false positive may be seen in Pseudomonas. The false positivity can be eliminated by control test using the same medium without urea as recommendation. Urea is a nitrogenous waste product of animals. Some bacteria can cleaved it to produce carbon dioxide and ammonia. The ammonia is a nitrogen source for amino acid biosynthesis as well as for synthesis of other nitrogen-containing molecules in the cell. The urease test was devised to distinguish Proteus species from other enterics. The medium described here is buffered enough so that weak urease producers appear negative. The production of ammonia raises the pH of the medium. The indicator phenol red is present in the broth. Phenol red is orange-yellow at pH below than 6. 8, and turns bright pinkish-red at pH higher than 8. 1. Hence, a positive urea test is denoted by the change of medium color from yellow to pinkish red. CONCLUSION: Based on the laboratory, different bacteria species have different abilities to metabolize various substrates and end products formed were able to be observed and distinguished.

Write summery about what these websites are about Annotated Bibliography

Write summery about what these websites are about - Annotated Bibliography Example and Northern Development Canada that was first called Indian and Northern Affairs Canada (INAC) is discriminating in fairly providing funds for children of aboriginal reserves. They also claim that the children are also being denied to welfare benefits of reserves. . It is not only about the indigenous children who are suffering at the hands of government but there are other issues like water crisis and more than 582 indigenous women murdered and missing but no action has been taken so far by the Canadian government. That’s why, the society has sued against the INAC for showing this acute prejudice. The plea has been filed to Canadian Human rights commission alleging that the federal government has differentiated between the children of first nations and those originally from Canada on racial basis. Â  The society and INAC worked for several years to eliminate inequality but all efforts by society went to vain as the federal government did not show any response to efforts done so far but failed badly to develop solutions to redress inequalities among children on racial basis. Canadian Human Rights Commission found in 1977, is an autonomous government body that deals with the Canadian Human Rights Act. The Canadian commission has the right to investigate complaints filed on racial and discriminatory basis under federal jurisdiction and also has jurisprudence to hear the cases filed in favour of children on reserves of first nations. The society has also filed another plea to the commission in 2010, accusing that the Aboriginal and INAC are not only prejudiced against the children of first nations but they have racist attitudes against the FNCFC society too as they excluded the society’s executive director, Cindy Blackstock from the meetings aimed at development of first nations. The society has accused that the handling of society’s members by INAC has been ridiculous so far and was based on retaliation. The commission later on directed the case to the

Taxation Assignment Example | Topics and Well Written Essays - 1750 words - 5

Taxation - Assignment Example Finney (2004) observed that governments make use of taxation to discourage or encourage economic decisions. For example, the government could reduce taxes on personal income by the money paid as interest on mortgage loans, hence resulting in more construction activities that generate more employment. Taxation in the UK mainly involves making payments to the local and central government. The local government revenues are received in form of grants from the central government finances and fees from street parking while the central government receives revenues from income tax, value added tax, fuel duty, National Insurance contributions, and corporation tax (Viitala, 2005). This document is going to give opinions on whether the UK government should restore the 50% additional rate of income tax or not. The document will provide a brief explanation on the recent history of the additional rate of the income tax and then discuss arguments in favour of and against the 50% additional rate of income tax. The 50% additional income tax rate was introduced in April 2010 by the then Chancellor, Alistair Darling (Ault and Arnold, 2010). The 50% rate applied to those individuals who had incomes of above 150,000 pounds. Initially in Chancellor Darling’s budget in 2009, he had announced that various tax increases would add up to more than 6 billion pounds by 2012, in order to safeguard the economic future and to assist the citizens when in need. The changes in the budget included an increase in the rates of indirect taxes especially duties on highway fuel and alcohol for that tax year, and changes in income tax from April 2010 that included the new 50% rate on all incomes above 150,000 pounds. The increases in tax rates, especially the new 50% rate, initiated reactions to the budget as many viewed it as a major change in the government’s labour approach to charging those who are wealthy (King, 2011). King (2011) noted that the HM

To Kill a Mockingbird by Harper Lee :: essays research papers

The novel To Kill A Mockingbird by Harper Lee, takes place during the 1930's in Maycomb County, Alabama. Atticus Finch, a white southern lawyer, is appointed to defend Tom Robinson, an innocent black man accused of raping a white woman. Throughout the story Atticus' children learn the meaning of true courage. Although Atticus proves Tom's innocence, the prejudice white jury's verdict is that Tom is guilty. The assumed black characteristics of immorality, dishonesty, shiftlessness and personal squalor are embodied by the white Ewell clan. This is a glaringly obvious fact that the prejudiced Maycomb society refuses to acknowledge.   Ã‚  Ã‚  Ã‚  Ã‚  Three examples of black characters who do not fit his 'stereotype'; are Reverend Sykes, Calpurnia and Tom Robinson. My first example is Reverend Sykes. He is a respected, generous man who runs a clean church and accepts worshipers both white and black. When Calpurnia brings Scout and Jem to the black church, he and the congregation welcome them. This shows that in the eyes of the Reverend, as in the eyes of God their is no prejudice. At the trial, Reverend Sykes makes room for Scout and Jem in the courtroom balcony where the blacks sit. While the trail is going on the blacks show no disrespect for Jem and Scout. After the trial is over, out of respect, the blacks wait until Atticus Finch passes and then they stand.   Ã‚  Ã‚  Ã‚  Ã‚  Secondly is the character of Calpurnia who also does not fit this stereotype. Calpurnia is the housekeeper for the Finchs and also helped raise Scout and Jem. Calpurnia is educated, hard working and well kept. She taught her children to read and Scout and Jem how to write on her own time. All that she had accomplished was done at a time when most Negroes could not read or write.   Ã‚  Ã‚  Ã‚  Ã‚  The last black character who embody the characteristics of immortality, dishonesty, shiftlessness and personal squalor is Tom Robison.. Tom is married with children and works hard to support them with a job. His house and yard are well cared for and he attends church. Not only that, but he stops at the Ewell house to help Mayella knowing that he is putting himself in a compromising position. At the trial, while on the stand, he answers questions in a respectable, dignified manner even though he is being accused of a crime he didn't commit. At one point when he is on the stand, Atticus questions him to tell the jury what Bob Ewell told him and he says, 'Somethin' not fittin' to say - not fittin' for these folk'n chillun to hear-'; (p.

To Kill a Mockingbird by Harper Lee :: essays research papers

The novel To Kill A Mockingbird by Harper Lee, takes place during the 1930's in Maycomb County, Alabama. Atticus Finch, a white southern lawyer, is appointed to defend Tom Robinson, an innocent black man accused of raping a white woman. Throughout the story Atticus' children learn the meaning of true courage. Although Atticus proves Tom's innocence, the prejudice white jury's verdict is that Tom is guilty. The assumed black characteristics of immorality, dishonesty, shiftlessness and personal squalor are embodied by the white Ewell clan. This is a glaringly obvious fact that the prejudiced Maycomb society refuses to acknowledge.   Ã‚  Ã‚  Ã‚  Ã‚  Three examples of black characters who do not fit his 'stereotype'; are Reverend Sykes, Calpurnia and Tom Robinson. My first example is Reverend Sykes. He is a respected, generous man who runs a clean church and accepts worshipers both white and black. When Calpurnia brings Scout and Jem to the black church, he and the congregation welcome them. This shows that in the eyes of the Reverend, as in the eyes of God their is no prejudice. At the trial, Reverend Sykes makes room for Scout and Jem in the courtroom balcony where the blacks sit. While the trail is going on the blacks show no disrespect for Jem and Scout. After the trial is over, out of respect, the blacks wait until Atticus Finch passes and then they stand.   Ã‚  Ã‚  Ã‚  Ã‚  Secondly is the character of Calpurnia who also does not fit this stereotype. Calpurnia is the housekeeper for the Finchs and also helped raise Scout and Jem. Calpurnia is educated, hard working and well kept. She taught her children to read and Scout and Jem how to write on her own time. All that she had accomplished was done at a time when most Negroes could not read or write.   Ã‚  Ã‚  Ã‚  Ã‚  The last black character who embody the characteristics of immortality, dishonesty, shiftlessness and personal squalor is Tom Robison.. Tom is married with children and works hard to support them with a job. His house and yard are well cared for and he attends church. Not only that, but he stops at the Ewell house to help Mayella knowing that he is putting himself in a compromising position. At the trial, while on the stand, he answers questions in a respectable, dignified manner even though he is being accused of a crime he didn't commit. At one point when he is on the stand, Atticus questions him to tell the jury what Bob Ewell told him and he says, 'Somethin' not fittin' to say - not fittin' for these folk'n chillun to hear-'; (p.

To Kill a Mockingbird by Harper Lee :: essays research papers

The novel To Kill A Mockingbird by Harper Lee, takes place during the 1930's in Maycomb County, Alabama. Atticus Finch, a white southern lawyer, is appointed to defend Tom Robinson, an innocent black man accused of raping a white woman. Throughout the story Atticus' children learn the meaning of true courage. Although Atticus proves Tom's innocence, the prejudice white jury's verdict is that Tom is guilty. The assumed black characteristics of immorality, dishonesty, shiftlessness and personal squalor are embodied by the white Ewell clan. This is a glaringly obvious fact that the prejudiced Maycomb society refuses to acknowledge.   Ã‚  Ã‚  Ã‚  Ã‚  Three examples of black characters who do not fit his 'stereotype'; are Reverend Sykes, Calpurnia and Tom Robinson. My first example is Reverend Sykes. He is a respected, generous man who runs a clean church and accepts worshipers both white and black. When Calpurnia brings Scout and Jem to the black church, he and the congregation welcome them. This shows that in the eyes of the Reverend, as in the eyes of God their is no prejudice. At the trial, Reverend Sykes makes room for Scout and Jem in the courtroom balcony where the blacks sit. While the trail is going on the blacks show no disrespect for Jem and Scout. After the trial is over, out of respect, the blacks wait until Atticus Finch passes and then they stand.   Ã‚  Ã‚  Ã‚  Ã‚  Secondly is the character of Calpurnia who also does not fit this stereotype. Calpurnia is the housekeeper for the Finchs and also helped raise Scout and Jem. Calpurnia is educated, hard working and well kept. She taught her children to read and Scout and Jem how to write on her own time. All that she had accomplished was done at a time when most Negroes could not read or write.   Ã‚  Ã‚  Ã‚  Ã‚  The last black character who embody the characteristics of immortality, dishonesty, shiftlessness and personal squalor is Tom Robison.. Tom is married with children and works hard to support them with a job. His house and yard are well cared for and he attends church. Not only that, but he stops at the Ewell house to help Mayella knowing that he is putting himself in a compromising position. At the trial, while on the stand, he answers questions in a respectable, dignified manner even though he is being accused of a crime he didn't commit. At one point when he is on the stand, Atticus questions him to tell the jury what Bob Ewell told him and he says, 'Somethin' not fittin' to say - not fittin' for these folk'n chillun to hear-'; (p.

Australia the Movie: Synopsis, History and Comparisons

In Australia, an aboriginal medicine man/witch doctor, King George was teaching a young aborigine named Nullah how to do various tasks in the Outback. When all of the sudden a group white men shoot King George with an arrow. Then, Nullah rides home on his horse to his home in Faraway Downs. He hears people coming and is scared that someone will take him away from his family, so he goes into hiding. However, the voices he hears and people he sees are Drover and Sarah. The property of Faraway Downs is Sarah’s and her husband’s. When Sarah goes into her property she finds that her husband has been killed and he is lying dead across a table. Because of this Sarah decides she wants to sell her property to the Carney Empire. However, if Faraway Downs is sold, the company will have a monopoly over the cattle business. Sarah soon finds out from Nullah that Carney is stealing her cattle and driving them across the river. Soon after she hears the news she fires Fletcher (the current driver for her cattle) and hires Drover to drive in their 1,500 cattle. They need 7 people in all to successfully drive them all in so, Sarah, Nullah, his mother and grandmother, and an aborigine named Magarri offer their help. They could still use one more person but no others are willing or capable. Then one morning the police appear at the house and are looking for Nullah and his mother who are hidden in the water tower. Sadly, his mother drowns in the tower because the tank filled up when one of the men used the faucet to cool down. Now Nullah is motherless so Sarah decides to give it a shot and raise him herself. She does not do a wonderful job of this because she does not have any children of her own. Fletcher creates a stampede by lighting the brush on fire and has the cows heading towards a cliff. Some fall off the cliff but many cows were saved because Nullah resorted to song and magic to stop the cattle. Fletcher is attempting to hurt their cattle and destroy their plans on saving Faraway Downs by killing cattle, burning items and poisoning waterholes. At a ball Carney attempts to convince Sarah to sell Faraway Downs to him. However, she refuses and tells him that it is no longer for sale. A few days later Fletcher pushes Carney into water where an alligator attacked and killed him. Also, Nullah goes missing. But Drover believes he is safe and protected by King George. Unfortunately they are not safe and are caught by the police where Nullah is sent to the mission and King George is put in jail. There is a treat of war in the city of Darwin so the town is being evacuated. Sarah searches for Nullah and can hear his singing but cannot find him. He is being sent to another island to work on a mission. While Sarah is working at an Army radio headquarters Japanese planes bomb the headquarters and the building catches on fire. Also, the jail is hit and King George escapes. Drover thinks Sarah has died and rescues Nullah and the other children from the explosion on the island. Sarah survives the explosion and is reunited with her love, Drover and Nullah. Afterwards, they return safely to their farm and all survive the explosions and save their cattle from Carney and Fletcher. Australia History During the 1930’s Germany was expanding its territory and in 1939 they threatened to invade Poland. Germany decided to disobey Britain and France when they told Germany that they would declare war if Poland was invaded. The Australian people do not approve of the German expansion and because they are a British nation they were pulled into the war along with Britain (www. nzacday. org). Australia declared war on Germany on September 3, 1939 and joined the war in Europe to aid its Allies in the United Kingdom (www. worldwariihistory. com). Australia was forced to make a tough decision: to watch after homeland in case Japan attempted to expand its power, or send troops to aid England in the war. Because Japan pledged its neutrality and the British naval base in Singapore would stop any Japanese invasions towards Australia, they decided to commit itself to the European War. Australian troops were not prepared to fight and risk their lives in war. This caused he Royal Australian Navy to be put under British control. They began to train and recruit men and they helped the Royal Air Force in the war against Germany (www. anzacday. org). During 1940 and 1941 troops in Australia helped capture Bardia and Tobruk in Libya because they saw action in North Africa and the Middle East. Once Japan bombed Pearl Harbor and the war was brought closer to Australian homeland, Australia declared war on Japan. The most direct threat that Australia faced was New Guinea. Thankfully, the Americans held off a naval attack on Australia at the Battle of the Coral Sea in May 1942. By the end of WWII, Australia has lost about 30,000 men and women (www. worldwariihistory. com). Also, the Indigenous people of Australia were driven out by the British and many were killed and driven out of their homes. The deaths of aborigines occurred because of the diseases spread by Europeans, the introduction of domestic animals destroyed many natural habitats and fighting in Tasmania. During the early 20th century laws were passed to segregate and protect aborigines. This caused restrictions on where they could live, and work. Families were also broken up (www. australianexplorer. com). Also, during WWII aborigines under the age of five were taken from their homes by white men and sent to live with white families. The British did this because the Australian government thought their race lacked a solid future. The children were never reunited with their families (http://history. howstuffworks. com). Unfortunately after WWII the British wanted to ‘Europeanize’ them. In this case all rights were taken away from the aborigines. During the 1960’s, the aborigines were given citizenship status but in 1972 they were given limited rights to their own land (www. australianexplorer. com). Australia Analysis During World War II in the 1930’s and 1940’s there are many similarities and differences in Australia the movie compared to the country’s real history. A similarity between history and Hollywood is that they both go into great detail on how horribly the British treated the aborigines of Australia. A difference between the two was how little detail the movie Australia went into when it came down to the war itself and its allies. Throughout the movie the director, Baz Luhrmann does not focus on the key points of the outcome of WWII, the disaster and hardship it put on Australia, and the effects on its people and cities. A similarity of the treatment of aborigines is that in the movie the aborigines were taken away from their families and homes. This was known as the Stolen Generation in Australia. During the movie they were sent away to work on missions on different islands and were rarely seen again by their families. Although this did occur in reality the children were mainly forcefully sent or tricked into living with a white family. The parents were sometimes unaware that their children were even still alive. The government would often tell them their child had died. Where in reality they are living with a white family so they have a chance at a better future. A difference between the movie Australia and reality is how little detail Baz Luhrmann displays on the actual war itself. Throughout the entire movie except for the end, the main idea is focused on cattle and the Stolen Generation. However during the end, WWII begins to take place and the movie displays the war aspect. It does not explain how the war began, the final result, or the results on Australian people. The war began in Germany because they tried to expand their territory into Poland. France and Britain declared war and because Australia was British territory they also joined in the fight. The movie did include when Japan attacked close to Australia at Pearl Harbor, which caused them to go to war against each other. By the end WWII Australia lost about 30,000 men and women.