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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Propagation of Uncertainty from Systematic Error01:10

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The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
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Vectors are mathematical entities characterized by both magnitude and direction. Unlike scalars, which are defined solely by magnitude, vectors represent quantities like displacement, velocity, and force, where direction is essential. Vectors are graphically represented as directed line segments, extending from an initial point to a terminal point, denoted with bold letters or arrows placed above the symbol. Two vectors are deemed equal if they share identical magnitudes and directions,...
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Propagation of Uncertainty from Random Error00:59

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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Detection of Protein Interactions in Plant using a Gateway Compatible Bimolecular Fluorescence Complementation BiFC System
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Propagating Gateway Vectors.

John S Reece-Hoyes, Albertha J M Walhout

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    Gateway cloning requires specific Escherichia coli strains. Testing new Gateway plasmids ensures they effectively eliminate standard cloning strains, preventing mutations and ensuring successful cloning reactions.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biotechnology

    Background:

    • The Gateway recombinatorial cloning system relies on specific vectors.
    • These vectors are propagated in *Escherichia coli* strain DB3.1, which is immune to the toxic *ccdB* gene.
    • Mutations in the *ccdB* gene can compromise the system's efficacy.

    Purpose of the Study:

    • To establish a reliable method for verifying the integrity of Gateway plasmids.
    • To ensure that newly generated Gateway vector stocks are suitable for downstream cloning applications.
    • To prevent the use of mutated plasmids that could lead to failed cloning experiments.

    Main Methods:

    • Generating multiple independent stocks of Gateway vectors from single bacterial colonies.
    • Transforming these vector stocks into both *Escherichia coli* strain DB3.1 and a standard cloning strain (e.g., DH5α).
    • Assessing the growth of transformants in the standard cloning strain to detect *ccdB* mutations.

    Main Results:

    • Wild-type Gateway plasmids, when transformed into standard *E. coli* cloning strains, result in minimal or no colony formation due to the functional *ccdB* gene.
    • Mutant Gateway plasmids, which have lost *ccdB* function, allow for the growth of colonies in standard *E. coli* cloning strains.
    • This differential growth serves as a clear indicator of plasmid integrity.

    Conclusions:

    • A critical quality control step for Gateway cloning involves testing vector stocks for their ability to inhibit growth in standard *E. coli* cloning strains.
    • Only vector stocks that demonstrate effective killing of standard cloning strains should be utilized in Gateway cloning reactions.
    • This validation process ensures the reliability and efficiency of the Gateway system for molecular cloning applications.