0
The decline/death phase is occurs when the rate of cell death is higher than the rate of cell multiplication. This is normally due to nutrient shortage and/or build-up of waste products.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What are the growth stages within a logistic growth curve?
4 stages lag phase, exponential phase, stationary phase and, decelerating phase
What is bacterial kinetics?
The growth of microorganisms reproducing by binary fission can be plotted as the logarithm of the number of viable cells versus the incubation time. The resulting curve has four distinct phases and its mathamatical expression are called bacterial or microbial kinetics. Lag Phase When microorganisms are introduced into fresh culture medium, usually no immediate increase in cell number occurs, and therefore this period is called the lag phase.Exponential Phase During the exponential or log phase, microorganisms are growing and dividing at the maximal rate possible given their genetic potential, the nature of the medium, and the conditions under which they are growing. Stationary Phase Eventually population growth ceases and the growth curve becomes horizontal. This stationary phase usually is attained by bacteria at a population level of around 109 cells per ml. Death Phase Detrimental environmental changes like nutrient deprivation and the buildup of toxic wastes lead to the decline in the number of viable cells characteristic of the death phase. The death of a microbial population, like its growth during the exponential phase, is usually logarithmic During the exponential phase each microorganism is dividing at constant rate. Thus the population will double in during the specific length of time called the generation time or doubling time These observations can be expressed as equations for thegeneration time. Let No the initial population number Nt the population at time t n the number of generations in time t Then Nt = No multiply 2n
Which phases of a typical bacterial growth curve illustrates a log change in cell number. Oviously log or growth phase is logarithmic. Is the death phase a negative log change?
Exponential
At what stage in the microbial growth curve spores develop?
Spores form during the Stationary Phase of the Bacterial Growth Curve. During the lag phase or the log phase, things are good for the bacteria, so they arent thinking about what it is like to live without all the resources that they need, so they dont start forming the spores yet. Once the bacteria reach the death phase they are not able to form spores anymore, let alone stay alive. So the only phase that the spore forming bacteria make there spores is during the stationary phase.
What is the stage where bacteria grows rapidly?
Under ideal conditions, the growth of a population of bacteria occurs in several stages termed lag, log, stationary, and death.During the lag phase, active metabolic activity occurs involving synthesis of DNA and enzymes, but no growth.Geometric population growth occurs during the log, or exponential phase, when metabolic activity is most intense..Following the log phase, the growth rate slows and the production of new cells equals the rate of cell death. This period, known as the stationary phase, involves the establishment of an equilibrium in population numbers and a slowing of the metabolic activities of individual cells. The stationary phase reflects a change in growing condition—for example, a lack of nutrients and/or the accumulation of waste products.When the rate of cell deaths exceeds the number of new cells formed, the population equilibrium shifts to a net reduction in numbers and the population enters the death phase, or logarithmic decline phase. The population may diminish until only a few cells remain, or the population may die out entirely.
When the exponential phase of a logistic growth curve of a population ceases what happen to population growth?
population growth begins to slow down
Is the death phase the portion of the growth rate curve characterized by an accelerated increase in population size?
No Sir :D
What are the phases of logistic growth curve?
There are three phases in a logistic growth curve:1 - Lag phase: the initial stage on which population growth rates are slow as a result of a small population size (occurs when the population is small and is increasing slowly)2- Log phase: The stage in which population growth rates are very rapid (occurs when the population undergoes very rapid growth)3- Stationary phase: The phase in which population growth rates decrease as the population size reaches the carrying capacity and stabilizes (occurs at or close to the carrying capacity of the environment)HOPE THIS HELPS :D
Which is not a phase found on a growth rate curve?
Closed Phase :)
What are the growth stages within a logistic growth curve?
4 stages lag phase, exponential phase, stationary phase and, decelerating phase
During which phase of the bacterial growth curve does the total number of viable cells decline?
dead phase
2 Can generation time be calculated from any phase of the growth curve?
No it connot for example, generation time cannot be calculated from the lag phase of a growth curve.
What is true about the regions between the curved lines on a heating curve?
They correspond to only one phase on a phase diagram.
What is the type of friction on a curve of a roller coaster?
Kinetic or centrifugal, depening what phase you are on.
What does late log phase of bacterial growth curve?
you never finished your question
What is usually the longest phase of a population's life cycle?
The longest phase of a population's life cycle is typically the adult phase. This phase encompasses the majority of an organism's lifespan, during which it is capable of reproduction and contributes to the growth and stability of the population. This phase is followed by senescence, or the decline in physiological function, and ultimately death.
What are the significance of bacterial growth curve in food preservation?
Well bacterial growth curve give simply the time vs no of cell curve which can be consider for different bacteria that at which temprature and pH they can stop growing, which would help in preserving food.
