Scientific Method In Action - The Strange Case of BeriBeri In 1887 a strange nerve disease attacked the people in the Dutch East Indies. The disease was beriberi. Symptoms of the disease include weakness and loss of appetite, victims often died of heart failure. Scientists thought the disease might be caused by bacteria. They injected chickens with bacteria from the blood of patients with beriberi. The injected chickens became sick. However, so did a group of chickens that were not injected with bacteria. One of the scientists, Dr. Eijkman, designed a new experiment based on his own observations. Before the experiment, all the chickens had eaten whole-grain rice, but during the experiment, the chickens were fed polished rice. Dr. Eijkman researched this interesting case and found that polished rice lacked thiamine, a vitamin necessary for good health. 1. State the question or problem that Dr. Eijkman investigated. 2. What was the original hypothesis? 3. What was the manipulated (independent) variable and the responding (dependent) variable? 4. Write a statement that summarizes the results of the experiment. 5. How would Dr. Eijkman test his new hypothesis? How Penicillin Was Discovered In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present. Fleming hypothesized that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth and then added the broth to a culture of bacteria. He observed that the bacteria in the culture died. Fleming's experiments were later used to develop antibiotics. 6. State the question or problem that Fleming investigated. 7. What was Fleming's hypothesis? 8. How was the hypothesis tested? 9. Write a statement that summarizes the results of the experiment. 10. This experiment led to the development of what major medical advancement?
Answers
Answer:
Jute fibers are composed primarily of the plant materials cellulose and lignin. Coir is a natural fibre extracted from the husk of coconut and used in products such as floor mats, doormats, brushes, mattresses, etc. Coir is the fibrous material found between the hard, internal shell and the outer coat of a coconut.
1. If beri beri disease was caused by a bacteria
2. weakness, loss of appetite
3. injected chickens
4. Elijkman found out thatpolished rice lacked thiamine
5. Not mentioned
Explanation:
The Strange Case of BeriBeri: Scientific Method in Action People in the Dutch East Indies were struck with a peculiar nerve illness in 1887. The illness was called beriberi. The condition causes weakness and a loss of appetite, and sufferers frequently die of heart failure. The sickness was considered to be caused by bacteria, according to scientists. They transferred microorganisms from the blood of beriberi patients into hens. The hens who had been injected fell ill. A set of hens that were not injected with germs, on the other hand, did not. Dr. Eijkman, one of the scientists, devised a novel experiment based on his own findings. All of the hens had eaten whole-grain rice before the trial, but they were fed polished rice during it.