Effects of temperature, oxygen, and chemical disinfectants on microbial growth_revised(1)

Discuss biofilms and their relevance to infectious diseases. Discuss population growth and the phases of a typical bacterial growth curve. Describe generation time for a bacterial population Explain how bacterial growth correlates to disease. Describe how environmental changes can alter the shape of a growth curve. Categorize microbes based on their preferred environmental niches (pH, temperature, oxygen and salt). Identify the biological properties that allow different classes of microbes to grow in extreme environments.

Explain 2 factors that influence microbial growth.

TOPIC : MICROBIAL GROWTH Classify the bacteria that is most likely involved in each situation provided according to their classification (as to microbial growth requirements). CHOICES: A. Obligate aerobe ,B. Obligate anaerobe, C. Microaerophile, D. Aerotolerant anaerobe, E. Mesophile, F. Thermophiles 1.The bacteria under study thrives at the alveolar ducts in the lungs causing respiratory disease. 2.In the experiment, the agar plate containing an axenic culture was originally incubated inside a candle jar for one day and then transferred to an oxygen-rich incubator for another day. Findings: the microbial growth persisted and stayed the same regardless of the specific type of incubation employed. 3.A microorganism that can survive pickling and refrigeration was discovered when a tightly-sealed jar of pickles grew several colonies despite following the correct recipe, tight closure seal, and proper refrigeration. 4.The spoiled bottle of wine that was stored at standard room temperature…

● ● Differentiate anaerobes from aerobes and describe how they are cultured. Explain how both aerobes and anaerobes can cause disease. Discuss how biofilms develop. Explain the importance of biofilms to infection. Describe the process of sporulation, and explain how spores impact certain infections.

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Describe the importance of the nitrogen and carbon cycles and the role of microbes in their maintenance. Discuss biofilms and their relevance to infectious diseases. Discuss population growth and the phases of a typical bacterial growth curve. Describe generation time for a bacterial population Explain how bacterial growth correlates to disease. Describe how environmental changes can alter the shape of a growth curve. Categorize microbes based on their preferred environmental niches (pH, temperature, oxygen and salt). Identify the biological properties that allow different classes of microbes to grow in extreme environments.

have prote 3. Describe the formation of biofilms and their potential for causing infection. Identify a way in which pathogens find it advantageous to form biofilms. Explain the importance of biofilms to infection. Explain 4 approaches to preventing or limiting biofilms. 4. Compare heterotrophy, autotrophy, phototrophy, and chemotrophic (lithotrophy and

Summarize the terms used to characterize microbes based on they physical growth factors including... 1. pH (three terms, pH value, organism example each) 2. Temperature (five terms, temperature ranges, organism example each) 3. Oxygen (five terms, description of growth, organism example each) 4. Salt (three terms, salt concentration, organism example each)

write down 6 things about microbial growth.

A. Bacterial Growth Curve Categorization. Drag and drop the microbial culture plates on the column that best represents the bacterial colony growth phase. -Number of Bacterial Cells (Log) ➡➡➡ Lag Exponential Phase Phase Stationary Phase Time (h) 24 Death Phase 48

Why might clinical medicine have an interest in understanding bacterial cell division at the molecular level? Explain why a hyperthermophile would probably not be a human pathogen. Describe four factors that may have an influence on the effectiveness of an antimicrobial treatment. Explain why 70% or 80% alcohol is more effective than 100% alcohol in controlling microorganisms.

Bacteria that require an atmosphere strictly of CO2 for growth is called:

Diseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilm formers are more pathogenic. Brian goes to the hospital after not feeling well for a week. He has a fever of 38 °C (100.4 °F) and complains of nausea and a constant migraine. Distinguish between the signs and symptoms of disease in Brian’s case.

Human pathogens are generally which type of microbe?A. barophileB. halophileC. mesophileD. thermophileE. psychrophile

Which of the following groups of bacteria require or will use oxygen for respiration i. obligate aerobes ii. facultative anaerobes iii. obligate anaerobes iv. microaerophile v. aerotolerant anaerobe i & iv ii. & iv Oi&ii i, ii, iv ii & iv

Choose for the organisms below, depending on the incubation condition and media whether they will grow or not 1.Haemophilus influenzae in HBA CO2 2.Haemophilus influenzae in HBA anaerobic 3.Haemophilus influenzae in Chocolate agar CO2 4.Haemophilus influenzae in MacConkey 5.Clostridium perfringens in HBA CO2 6.Clostridium perfringens in HBA anaerobic 7.Clostridium perfringens in Chocolate agar CO2 8.Clostridium perfringens in MacConkey 9.Escherichia coli in HBA CO2 10.Escherichia coli in Chocolate agar CO2 11.Escherichia coli in MacConkey 12.Escherichia coli in HBA anaerobic.

There are various environmental factors that can influence microbial growth and reactions. These factors play a role which will determine if a microbe can function in a given environment. What are 2 environmental factors believed to be the most important out of the others ?

Besides dehydrated foods, how might the amount of water available to microbes be decreased? Group of answer choices Treatment by non-ionizing radiation. Treatment at high pressures for extended periods of time. Storage at temperatures between -2 and 4 °C. Pasteurization Addition of solutes such as salt or sugar.

Design a concept map on microbial growth that would contain the key features of the following concepts (Requirements of microbial growth, Bacterial Growth, Control of Bacterial Growth and Antimicrobial methods).

Explain the reasons why cream cheese is a high risk food for the elderly and pregnant women. The cheese would be easily spoiled if you found the condensed water on the inner side of the cover lid of the container, and also if you put it at room temperature for more than two hours. Explain in term of the factors of microbes growth. Explain it detailed.

Which of the following statements regarding microbial control agents is FALSE?   Question options:   strongly acidic or alkaline disinfectants are typically more effective than neutral pH agents   the presence of extracellular fats typically decreases the effectiveness of control agents   a warmed disinfectant is typically more effective than the same disinfectant at room temperature   substances secreted by members of biofilms increase protection against microbial control agents   all of these statements are TRUE   bacterial endospores are more resistant to antimicrobial treatment than vegetative bacterial cells

Which of the following terms is NOT used to describe microbes thrive in different temperature ranges? Thermophiles Psychrophiles O Mesophiles O Halophiles

Bacteria that prefer to grow at room temperature at low pH are: Mesophilic acidophiles Microaerophilic alkalophiles Psycrophilic neutraphiles Thermophilic acidophiles

Which of the following groups of microbes is most likely to be associated with humans? A   psychrophiles. B   thermophiles C   hyperthermophiles D   mesophiles.

Which of the following would be an example of a microbial chemoautotroph?     A yeast using oxidation/reduction of organic compounds as the energy source and organic compounds as the carbon source.     An archaean using oxidation/reduction of inorganic compounds as the energy source and a organic compounds as the carbon source.     A cyanobacterium using light as the energy source and CO2 as the carbon source.     A bacterium using oxidation/reduction of inorganic compounds as the energy source and CO2 as the carbon source.

A. Which of the following organisms is most closely related?

Which of the following statements regarding microbial death is FALSE?   Question options:   cell walls are targeted by many microbial control agents   the effectiveness of an antibacterial agent is a funciton of its microbial death rate   the rate at which microbes are killed is termed the microbial death rate   all of these statements are TRUE   few antimicrobial agents function through the disruption of protein structure   under a given set of conditions, the fraction of a microbial population that dies per minute is typically constant over time

Explain what is happening with this graph that charts the reactions ofa mesophilic bacterium to temperature. Blue shows the survival curveand brown the growth curve under various temperatures.

Bacteria can grow under a variety of conditions but also have growth preferences. Bacteria that prefer to grow under oxygen levels that are below that of atmospheric oxygen are called: Obligate aerobes Microaerophiles Anaerobes Facultative anaerobes Clear my selection

Which has a greater impact on the survival of an organism, temperatures above its maximum temperature or temperatures below its minimum temperature? Explain why and how this relates to typical methods used to control microbial growth.

Describe the microbial cell cycle and how it impacts industrial uses of microbes.     Describe the process of scale-up and the parameters involved. Describe the various physical and chemical methods available to control microbial growth. Discuss the pros and cons of single cell proteins as a food source for humans and animals. Describe the various options for using microbes to produce biofuels and their pros and cons. Describe the use of anaerobic digesters for producing methane. Define bioremediation. Describe two methods of side-effects testing. Define reductive dehalogenation and explain its importance. Explain the difference between a monooxygenase and a dioxygenase. Recognize the importance of the b- oxidation pathway in breaking down hydrocarbons. Explain why tertiary and quaternary substituted carbons are the most difficult to break down by biochemical means. Differentiate between in situ and ex situ bioremediation techniques and discuss the pros and cons of each. Discuss what…

You have two organisms A and B. One is an obligate aerobe and the other is an obligate anaerobe. You have 2 Nutrient Agar Plate Media that these organisms can grow on. How can you differentiare which organism is aerobic and which is anaerobic.

Out of the 5 possible oxygen requirements (Obligate aerobes, microaerophiles- is E. coli, Pseudomonas aeruginosa, and Clostridium sporogenes? sketch below (or describe well with words), what growth would look like for each species in FTM tubes.

Strict aerobes grow in the surface of thioglycollate broth where more oxygen is present. Group of answer choices True False

When food leftovers are stored in a refrigerator, how does this help prevent food borne illnesses? Group of answer choices Low temperatures deactivate any toxins that might be produced by microbes. Low temperatures inhibit the metabolism and growth of microbes. Low temperatures disrupt microbe membranes and kill any microbes that are present. Low temperatures prevent microbes from forming biofilms.