Tamil Nadu HSE Second Year Microbiology case studies
Tamil Nadu HSE Second Year Microbiology · Put your knowledge to work in context.
The Tamil Nadu Higher Secondary Course Second Year Microbiology is the Class 12 elective offered under the state board stream for students who chose the microbiology vocational or academic subject in Plus Two. It suits candidates aiming at laboratory technician roles, diagnostics, food and pharmaceutical quality control, agriculture, or a B.Sc. The Tamil Nadu HSE Second Year Microbiology case studies are 5 cases and about 3,566 words.
1Autoclave Failure Before a Streak-Plate Practical
At a higher secondary school microbiology laboratory in Coimbatore, students must prepare 20 nutrient agar plates for a streak-plate practical the next morning. The lab assistant dissolves 25 g of nutrient agar in 500 mL distilled water in a 1 L borosilicate flask, tightens the screw cap fully, and autoclaves the flask at 121 °C and 15 psi for 15 minutes.
817 words, about 4 min2All-Pink Gram Stain in a Sputum Sample
A microbiology technician at a district hospital in Madurai receives a purulent sputum sample from a 45-year-old man with fever, productive cough and chest pain. She prepares a Gram stain: a thin smear is heat-fixed, flooded with crystal violet for 1 minute, rinsed, covered with Gram’s iodine for 1 minute, rinsed, decolourised with 95% ethanol for 45 seconds, rinsed, counterstained with safranin for 30 seconds, rinsed, air-dried and examined under oil immersion.
710 words, about 4 min3Cold-Chain Breach During a Measles–Rubella Campaign
During a measles–rubella vaccination campaign in a hill block of the Nilgiris, a primary health centre loses mains power for 9 hours. The vaccine refrigerator, normally kept at 2–8 °C, rises to 12 °C for 6 hours and then to 18 °C for 3 hours before power returns.
704 words, about 4 min4Bulging Lids in a Small-Scale Tomato Sauce Batch
A small food-processing unit in Madurai makes tomato sauce in 200 mL glass bottles. The recipe blends tomatoes, sugar, salt and vinegar to a measured pH of 4.2, then boils the sauce for 10 minutes, hot-fills into clean bottles at 85 °C, inverts the bottles for 2 minutes and cools them in tap water.
667 words, about 3 min5Dairy Effluent Discharged into a Farm Pond
A 50,000 L/day dairy processing plant near Erode discharges untreated effluent into a farm pond used by nearby farmers to irrigate fodder grass. Final-year microbiology students sample the pond: pH 8.5, BOD5 480 mg/L, COD 900 mg/L, oil and grease 40 mg/L, and a multiple-tube fermentation test gives an MPN of 1,600 coliforms per 100 mL.
668 words, about 3 min