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Related Concept Videos

Migration00:53

Migration

Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
Cell Migration01:09

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
Cell Migration01:19

Cell Migration

Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
Gastrulation01:56

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
Crossing over01:34

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...

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Related Experiment Video

Updated: May 27, 2026

A Simple Migration/Invasion Workflow Using an Automated Live-cell Imager
09:17

A Simple Migration/Invasion Workflow Using an Automated Live-cell Imager

Published on: February 2, 2019

Return migration from Canada to Britain.

A H Richmond

    Population Studies
    |November 19, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Return migration from Canada to Britain has been increasing since 1960. A 1962-63 survey identified three types of returning migrants: quasi-migrants, permanent repatriates, and transilient migrants.

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    Last Updated: May 27, 2026

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    08:59

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    Human T Lymphocyte Isolation, Culture and Analysis of Migration In Vitro
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    Human T Lymphocyte Isolation, Culture and Analysis of Migration In Vitro

    Published on: June 1, 2010

    Area of Science:

    • Sociology
    • Demography
    • Migration Studies

    Background:

    • Post-war migration patterns between Canada and Britain.
    • Understanding the dynamics of return migration.

    Purpose of the Study:

    • To analyze trends in return migration from Canada to Britain.
    • To classify and characterize different types of returning migrants.

    Main Methods:

    • Statistical comparison of migrant data (1956-1965).
    • Sample survey of returning migrants (1962-1963).
    • Analysis of demographic, economic, and social characteristics.

    Main Results:

    • Return migration from Canada to Britain shows an increasing trend since 1960.
    • Three distinct types of returning migrants identified: quasi-migrants, permanent repatriates, and transilient migrants.
    • Varied characteristics observed among the different migrant types and their future intentions.

    Conclusions:

    • Return migration is a significant and growing phenomenon.
    • Understanding migrant typologies is crucial for policy and support.
    • Future migration intentions vary widely among returnees.