Concept explainers
Culturing Microorganisms
One of Koch’s postulates for demonstrating that a certain agent causes a specific disease requires that microorganisms be isolated and cultivated (Chapter 1). Medical laboratory personnel must also grow pathogens as a step in the diagnosis of many diseases. To cultivate or culture microorganisms, a sample called an inoculum (plural: inocula) is introduced into a collection of
Clinical Case Study Cavities Gone Wild
Five-year-old Daniel appears to be shy. He always looks at the floor, has no friends, never plays with the other children, and will rarely speak to adults. When he does speak, it is difficult to understand his broken enunciation. His skinny frame and the dark circles under his eyes make him appear malnourished. Daniel cries frequently and misses many days of school.
A speech specialist at school finds that only two of Daniel’s teeth are healthy; all the others have rotted away to the gum line. The little guy is in constant pain, and it hurts to chew. A doctor later determines that bacteria from the cavities in his mouth have entered his bloodstream and infected his heart, causing an irregular heartbeat and poor blood circulation.
- 1. How does knowledge of biofilms help explain the bulk of Daniel’s problems?
- 2. What can Daniel, his parents, and health care professionals do to cure his diseases?
- 3. What is the scientific name of the nutrient that Daniel’s parents should eliminate from his diet to help prevent a repeat of this condition?
- 4. A recent study has shown that brushing does more than clean plaque from the teeth; it also disrupts associations between oral bacteria. How does this simple act help prevent the formation of biofilms?
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Microbiology With Diseases By Taxonomy (6th Edition)
- The preventive medical examination of the nursery school workers revealed 4 nuclei cysts in the stool samples of the some persons. Cysts were the same size and round shape. The diagnosis was amoebic dysentery. The outpatient treatment was prescript for those workers. Other workers should follow recommendations for the amoebiasis prevention. What is the base way of amoebiasis prevention? Select one: a. Water purification O b. Ground purification c. Heat treatment of food and water d. Water supply control e. Protection from blood sucking insectsarrow_forwardThis is how a hanging-drop slide is prepared. Figure from Macedo, Wikimedia Commons, 2016. 2 3 4 slide cover slip vaseline concavity drop of microbiological culture CA inoculation loop 11. Which slide gives you more information, the hanging drop or the stained slide? Why do you say so? 12. Why might it be valuable to know whether a bacterium is motile?arrow_forwardWhich of these microbial structures is the most difficult to kill when attempting to sterilize instruments? bacterial spores Mycobacterium pneumoniae protozoal cysts fungal sporesarrow_forward
- Which aspects of a microbial disease make it more likely to cause an outbreak? In other words, what advantages do these microbes have that others do not? Use an example of at least one outbreak in your description. 2. What measures are taken in the United States to prevent outbreaks from occurring? 3. What disease not prevalent in the United States do you think has the potential of causing a major outbreak in the United States? Name at least one reason to support your assertion.arrow_forward1-________terms describe the form of bacterial colonies on nutrient agar plate. 2- ______ is a terms to describe the surface growth of bacterial on nutrient broth tube.arrow_forwardKindly answer this questionarrow_forward
- MacConkey agar plates represent ________ medium. a differential a minimal a selective both a differential and a selective both a minimal and a selectivearrow_forwardThis is microbiology question. I got it wrong. Choose right one and give reason why it’s right and why others are wrongarrow_forwardLAB SECTION I WAS PRESENT AND PERFORMED THIS EXERCISE (INITIALS) The Lethal Effect of Ultraviolet Radiation on Microbial Growth OBSERVATIONS AND INTERPRETATIONS Enter your class data below. Score the relative amount of growth on each plate. Use the numbers 0, 1, 2, or 3 (0 is no growth; 3 is abundant growth). Organism B. subtilis 5 seconds Imin 5+ 1 3 minutes 10 minutes 10 seconds 5+ 3min 30 seconds 5min 4+ minute 10min S. aureus 5 + 3 + 4 니- + 2 1 Micrococcus 1 10 sec 4 M 31m 10min 3'ın Questions of this exercise is to demonstrate the comparative effect of UV on two bacterial populations. The purpose This could have been accomplished without the cardboard cover. Why was the cover used? control site 1 Expe SECTION TWO MICROBIAL GROWTH DATA SHEET 2-1arrow_forward
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