I-band

(noun)

The area adjacent to the Z-line, where actin myofilaments are not superimposed by myosin myofilaments.

Related Terms

  • Z-lines
  • Z-line
  • M-line
  • A-band
  • H-band
  • cross-bridge

Examples of I-band in the following topics:

  • Sliding Filament Model of Contraction

    • The I-band is spanned by the titin molecule connecting the Z-line with a myosin filament.
    • The region between two neighboring, parallel I-bands is known as the A-band and contains the entire length of single myosin myofilaments.
    • At the level of the sliding filament model, expansion and contraction only occurs within the I and H-bands.
    • During contraction myosin ratchets along actin myofilaments compressing the I and H bands.
    • During stretching this tension is release and the I and H bands expand.
  • Basics of DNA Replication

    • At the point, the molecules stopped sedimenting and formed a stable band.
    • The molecules that form the lowest bands have the highest densities.
    • The DNA harvested from cells grown for two generations in 14N formed two bands: one DNA band was at the intermediate position between 15N and 14N and the other corresponded to the band of exclusively 14N DNA.
    • Dispersive replication would have resulted in exclusively a single band in each new generation, with the band slowly moving up closer to the height of the 14N DNA band.
    • DNA grown in 15N (red band) is heavier than DNA grown in 14N (orange band) and sediments to a lower level in the cesium chloride density gradient in an ultracentrifuge.
  • Identification of Chromosomes and Karyotypes

    • In a given species, chromosomes can be identified by their number, size, centromere position, and banding pattern.
    • Giemsa staining results in approximately 400–800 bands (of tightly coiled DNA and condensed proteins) arranged along all of the 23 chromosome pairs.
    • An experienced geneticist can identify each chromosome based on its characteristic banding pattern.
    • In addition to the banding patterns, chromosomes are further identified on the basis of size and centromere location.
    • Notice that homologous chromosomes are the same size, and have the same centromere positions and banding patterns.
  • Superphylum Lophotrochozoa

    • This layer multiplies into a band which then splits internally to form the coelom; this protostomic coelom is termed schizocoelom.
    • Trochophore larvae are characterized by two bands of cilia around the body.
  • Strategies Used in Sequencing Projects

    • Because the ddNTPs are fluorescently labeled, each band on the gel reflects the size of the DNA strand and the ddNTP that terminated the reaction.
    • Reading the gel on the basis of the color of each band on the ladder produces the sequence of the template strand .
    • The DNA is separated on the basis of size, and these bands, based on the size of the fragments, can be read.
  • Phylum Annelida

    • The clitellum is a reproductive structure that generates mucus that aids in sperm transfer and gives rise to a cocoon within which fertilization occurs; it appears as a fused band in the anterior third of the animal .
    • It can be seen in this image as the enlarged band around the animal.
  • Muscle Tissues and Nervous Tissues

    • They differ by the presence or absence of striations or bands, the number and location of nuclei, whether they are voluntarily or involuntarily controlled, and their location within the body.
    • Smooth muscle tissue is also called non-striated as it lacks the banded appearance of skeletal and cardiac muscle .
  • Genetic Maps

    • The DNA of every individual will give rise to a unique pattern of bands when cut with a particular set of restriction endonucleases; this is sometimes referred to as an individual's DNA "fingerprint."
    • Certain regions of the chromosome that are subject to polymorphism will lead to the generation of the unique banding pattern.
  • Population Size and Density

    • With this method, researchers capture animals and mark them with tags, bands, paint, body markings, or some other sign.
    • With the mark and recapture method, researchers capture animals and mark them with tags, bands, paint, body markings or some other sign.
  • Meiosis I

    • During prophase I, chromosomes condense and become visible inside the nucleus.
    • In anaphase I, the microtubules pull the attached chromosomes apart.
    • In telophase I, the separated chromosomes arrive at opposite poles.
    • Early in prophase I, homologous chromosomes come together to form a synapse.
    • In this case, there are two possible arrangements at the equatorial plane in metaphase I.
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