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Related Concept Videos

Feedback Inhibition00:46

Feedback Inhibition

Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
Feedback Loops01:01

Feedback Loops

In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Proofreading01:31

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Allergic Reactions02:06

Allergic Reactions

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Contact-dependent Signaling01:19

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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In animal cells, gap junctions are formed...

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Related Experiment Video

Updated: Jul 7, 2026

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
07:56

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Published on: January 29, 2018

Authors' reply.

J M Costa, A N Venetsanopoulos, M Trefler

    IEEE Transactions on Medical Imaging
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Filtering tomograms allows changing the plane of cut, even with out-of-focus images present. This is because all superimposed layer images are processed together during filtering.

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    Last Updated: Jul 7, 2026

    Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
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    Published on: January 29, 2018

    Light/dark Transition Test for Mice
    10:35

    Light/dark Transition Test for Mice

    Published on: November 13, 2006

    Area of Science:

    • Electron microscopy
    • Image processing

    Background:

    • Tomographic reconstruction involves imaging samples at various angles.
    • Out-of-focus images can complicate data analysis in electron tomography.

    Purpose of the Study:

    • To clarify the feasibility of altering the plane of cut in tomograms.
    • To address the impact of out-of-focus images on tomographic filtering.

    Main Methods:

    • Applying image filtering techniques to tomographic data.
    • Analyzing the simultaneous processing of superimposed images.

    Main Results:

    • It is possible to change the plane of cut by filtering tomograms.
    • This method accommodates the presence of out-of-focus images.

    Conclusions:

    • Filtering tomograms provides a method to adjust the viewing plane.
    • The technique is viable despite the presence of superimposed out-of-focus data.