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- Discuss either (a) how allelopathy contributes to the invasiveness of spotted knapweed or (b) the difference between choice and non-choice experiments and how it relates to experiments on hyperaccumulating plants.Your screening facility can process 1,000 people per week. Assume you are attempting the early detection of a disease with a prevalence of 2%, and your test has a sensitivity of 95% and a specificity of 90%. D- what is the positive predictive value of the screening test? E- what is the negative predictive value of the screening test? F- what would happen to the negative predictive value of the screening test if the prevalence was 5%?When assessing the quality of milk samples using the breed count method, the number of microorganisms per field should fall within the range of 25-250. True or False.
- Explain why isolating a pathogen through standard culture methods may become an outdated diagnosis strategyWhat is the importance of employing aseptic techniques? Give an example of a situation in the laboratory that might happen when this method is not practiced.One laboratory method to detect for COVID-19 infection is via real time RT-PCR. The process starts with nasopharyngeal or oropharyngeal swabbing to get a sample. Explain concisely how this technique generally works and how it can be used for testing.
- A screening test for a disease is being evaluated against the current screening test (e.g., the gold standard test). The new test was administered to 3000 participants. Of those, 600 who had been previously diagnosed using the gold standard test were positive on the new screening test, and 200 who had been previously diagnosed using the gold standard test were negative on the new screening test. Also, 300 participants who were negative on the gold standard screening test were positive on the new test. What is the positive predictive value of the new screening test, using the gold standard test as evidence of disease? A screening test for a disease is being evaluated against the current screening test (e.g., the gold standard test). The new test was administered to 3000 participants. Of those, 600 who had been previously diagnosed using the gold standard test were positive on the new screening test, and 200 who had been previously diagnosed using the gold standard test were…Describe the purpose of a Root Cause Analysis (RCA) and explain how to effectively participate in an Root Cause Analysis?An enzyme immunoassay for the detection of chlamydia trachomatis in cervical specimens has a sensitivity of 75% and a specificity of 98% when compared with culture. This test will be used by an HMO to screen women of reproductive age who are receiving their annual examination. A previous study, which used culture to screen 1000 women, determined that the prevalence of infection was 2%. In this population, which of the following is the predictive value of a positive screening test?
