lag phase

(noun)

the period of bacterial growth in which bacteria adapt themselves to growth conditions; the individual bacteria are maturing and not yet able to divide

Related Terms

Examples of lag phase in the following topics:

  • Growth Rate and Temperature

    • When Escherichia coli is exposed to a temperature drop from 37 to 10 degrees Celsius, a four to five hour lag phase occurs and then growth is resumed at a reduced rate.
    • During the lag phase, the expression of around 13 proteins, which contain cold shock domains is increased two- to ten-fold.
    • Bacterial growth in batch culture can be modeled with four different phases: (A) the lag phase, when the population stays roughly the same; (B) the exponential, or log, phase, when the population grows at an increasing rate; (C) the stationary phase, when population growth stagnates; and (D) the death phase, when bacteria begin to die off and the population decreases in size.

  • Generation Time

    • In autecological studies, bacterial growth in batch culture can be modeled with four different phases: lag phase, exponential or log phase, stationary phase, and death phase .
    • During lag phase, bacteria adapt themselves to growth conditions.
    • The exponential phase (sometimes called the log phase or the logarithmic phase) is a period characterized by cell doubling.
    • At death phase, bacteria run out of nutrients and die.
    • The phases of growth are labelled on top.

  • Enrichment and Isolation

    • During lag phase, bacteria adapt themselves to growth conditions.
    • During the lag phase of the bacterial growth cycle, synthesis of RNA, enzymes and other molecules occurs.
    • Exponential phase (sometimes called the log or logarithmic phase) is a period characterized by cell doubling.
    • Bacterial growth in batch culture can be modeled with four different phases: lag phase (A), exponential or log phase (B), stationary phase (C), and death phase (D).
    • List the growth phases of microrganisms and the different types of growth media available to culture them

  • Measurements of Microbial Mass

    • Bacterial growth follows three phases: the lag phase, the log phase, and the stationary phase.

  • RLC Series Circuit: At Large and Small Frequencies; Phasor Diagram

    • We also learned the phase relationships among the voltages across resistor, capacitor and inductor: when a sinusoidal voltage is applied, the current lags the voltage by a 90º phase in a circuit with an inductor, while the current leads the voltage by 90∘ in a circuit with a capacitor.
    • Therefore, the rms current will be Vrms/XL, and the current lags the voltage by almost 90∘.

  • Capacitors in AC Circuits: Capacitive Reactance and Phasor Diagrams

    • The voltage across a capacitor lags the current.
    • Due to the phase difference, it is useful to introduce phasors to describe these circuits.
    • We say that the current and voltage are in phase.
    • Since the voltage across a capacitor lags the current, the phasor representing the current and voltage would be give as in .
    • Its amplitude is the modulus of the vector, and its argument is the total phase \omega t+\theta.

  • Slipped-Strand Mispairing

    • This RecA-independent mechanism can transpire during either DNA replication or DNA repair and can be on the leading or lagging strand and can result in an increase or decrease in the number of short repeat sequences.
    • The outcome is an ON or OFF phase of a gene or genes.
    • Through SSM the TA repeat region can undergo addition or subtraction of TA dinucleotides which results in the reversible ON phase or OFF phase of transcription of the hifA and hifB.

  • Cultural Lag

    • Cultural lag can occur when technological innovation outpaces cultural adaptation.
    • The term cultural lag refers to the notion that culture takes time to catch up with technological innovations, and that social problems and conflicts are caused by this lag.
    • This delay is the cultural lag.
    • Cultural lag creates problems for a society in different ways.
    • As example of cultural lag is human embryonic stem cells.

  • Phasors

    • In physics, a phase vector, or phasor, is a representation of a sinusoidal function whose amplitude (A), frequency (ω), and phase (θ) are time-invariant, as diagramed in .
    • In the latter case, it is understood to be a shorthand notation, encoding the amplitude and phase of an underlying sinusoid.
    • illustrated in the figure below is a cosinusoidal signal with amplitude A, frequency, and phase θ.
    • However, the amplitudes and phases of these sinusoidal voltages and currents are all different.
    • For example, the voltage across a resistor might lead the voltage across a capacitor by 90∘ and lag the voltage across an inductor by 90∘.

  • Seasonal Affective Disorder and Jet Lag

    • Jet lag is a chronobiological-related problem, similar to issues often induced by shift work.
    • To the degree that the body cannot immediately realign these rhythms, it is jet lagged.
    • Crossing one or two time zones does not typically cause jet lag.
    • A five-hour flight from the east to the west coast of the United States may well result in jet lag.
    • Jet lag has been measured with simple analogue scales but a study has shown that these are relatively blunt for assessing all the problems associated with jet lag.