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In supercooled solutions of H2O as low as -20 degrees, certain organisms can extract water for growth, and many forms of life flourish in the icy waters of the Antarctic, as well as household refrigerators, near 0 degrees. The cold-loving organisms are psychrophiles defined by their ability to grow at 0 degrees. A variant of a psychrophile (which usually has an optimum T of 10-15 degrees) is a psychrotroph, which grows at 0 degrees but displays an optimum T in the mesophile range, nearer room temperature. Psychrotrophs are the scourge of food storage in refrigerators since they are invariably brought in from their mesophilic habitats and continue to grow in the refrigerated environment where they spoil the food. Of course, they grow slower at 2 degrees than at 25 degrees. Think how fast milk spoils on the counter top versus in the refrigerator.

Psychrophilic bacteria are adapted to their cool environment by having largely unsaturated fatty acids in their plasma membranes. Some psychrophiles, particularly those from the Antarctic have been found to contain polyunsaturated fatty acids, which generally do not occur in procaryotes. The degree of unsaturation of a fatty acid correlates with its solidification T or thermal transition stage (i.e., the temperature at which the lipid melts or solidifies); unsaturated fatty acids remain liquid at low T but are also denatured at moderate T; saturated fatty acids, as in the membranes of thermophilic bacteria, are stable at high temperatures, but they also solidify at relatively high T. Thus, saturated fatty acids (like butter) are solid at room temperature while unsaturated fatty acids (like safflower oil) remain liquid in the refrigerator. Whether fatty acids in a membrane are in a liquid or a solid phase affects the fluidity of the membrane, which directly affects its ability to function.

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What is the Optimum temperature for s.albus?

The optimum temperature for Staphylococcus albus (S. albus) growth is around 37 degrees Celsius, which is body temperature. At this temperature, S. albus thrives and reproduces most effectively. Adjusting the temperature significantly higher or lower can slow down its growth rate.


Is the optimum growth temp the ideal temp for all cell activities. based on observation of S.marcescens and S.cerevisiae cultures Explain?

The optimum growth temperature is the temperature at which a microorganism grows best, which may not necessarily be the ideal temperature for all cellular activities. In the case of S. marcescens and S. cerevisiae cultures, the optimum growth temperature may differ from the optimal temperature for other metabolic processes such as enzyme activity or protein synthesis. Different cellular activities may have their own optimal temperature requirements beyond just growth.


What are the conditions that affect the growth of microorganisms?

Each microorganism requires it's own conditions. Some need very warm or even hot temperatures, some cold, some like salt and some do not. Some don't really care and will live anywhere.


What is the Rate of growth and death of microorganisms?

The rate of growth of microorganisms depends on factors like temperature, pH, and nutrient availability. Most microorganisms follow a sigmoid growth curve, starting slowly, then increasing rapidly, before plateauing. Death of microorganisms can occur due to factors like lack of nutrients, exposure to extreme temperatures, or disinfection methods.


In what ways could you adjust incubation temperature to grow an orgainsm at less than its optimal growth rate?

You could lower the incubation temperature below the organism's optimal growth temperature to slow down its growth rate. This could involve incubating the organism closer to its minimum growth temperature or at a temperature that is just slightly below its optimal growth temperature.

Related Questions

What class of microorganisms would have an optimum growth rate at 62C?

Thermophiles


What is the suitable temperaturezone for the growth of microorganisms?

The suitable temperature for the growth of microorganisms is the body temperature of the humans


What is the optimum growth temperature of Fusarium oxysporum?

Fusarium oxysporum is a mesophilic fungus with an optimum growth temperature range of 25-30°C. Growth outside of this range can result in reduced growth rates or even suppression of growth.


What is the Optimum temperature for s.albus?

The optimum temperature for Staphylococcus albus (S. albus) growth is around 37 degrees Celsius, which is body temperature. At this temperature, S. albus thrives and reproduces most effectively. Adjusting the temperature significantly higher or lower can slow down its growth rate.


Why do bacteria grow weak in the freezer?

Bacteria all have a specific optimum growth temperature. When the temperature is not at the optimum, growth is slowed down. When it is too cold, the bacteria will still be alive, but growth will be very slow and spoilage will happen slower.


Why the optimum temperature is near to the maximum temperature required for the growth of bacteria?

The optimum temperature for bacterial growth is close to the maximum temperature because it provides the ideal conditions for enzymatic activity and metabolic processes. At this temperature, bacteria can efficiently replicate and utilize nutrients, maximizing their growth rate. However, if the temperature exceeds the maximum threshold, proteins may denature, and cellular functions can be disrupted, leading to a decline in growth and viability. Thus, the optimum temperature is a balance that supports robust growth without compromising cellular integrity.


Is the optimum growth temp the ideal temp for all cell activities. based on observation of S.marcescens and S.cerevisiae cultures Explain?

The optimum growth temperature is the temperature at which a microorganism grows best, which may not necessarily be the ideal temperature for all cellular activities. In the case of S. marcescens and S. cerevisiae cultures, the optimum growth temperature may differ from the optimal temperature for other metabolic processes such as enzyme activity or protein synthesis. Different cellular activities may have their own optimal temperature requirements beyond just growth.


What is a cardinal temperature?

It is the minimum, maximum and optimum temperatures of plant growth and development.


What Four factors which affect the growth of microorganisms?

Four factors which affect the growth of microorganisms are: temperature food source for microorganisms (ie. sugar, protein, fat) the amount of microorganisms introduced to the food source ph of the food source


What is the optimum temperature for sorghum germination?

Sorghum has optimum temp for root growth is at 30˚С, Sorghum optimum temp for root growth is at 35˚С, therefore sorghum has an optimum temperature range of between 25-35˚С. Sorghum on the other hand has no germination until 10˚С where there is a steep increase to 79% in a 5˚С temperature change, where it continues to increase to have a maximum of 95% the graph then decreases slightly.


What is the optimum growth temperature for human pathogens?

The optimal temperature for most human pathogens might be expected to range from 25-45°C


What are the conditions that affect the growth of microorganisms?

Each microorganism requires it's own conditions. Some need very warm or even hot temperatures, some cold, some like salt and some do not. Some don't really care and will live anywhere.