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Related Concept Videos

Cell Migration01:09

Cell Migration

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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.
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Migration00:53

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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.
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Selected Data About Geographic Locations01:25

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Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
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Areas Within Irregular Boundaries01:26

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Calculating areas within irregular boundaries, such as along rivers or curved roads, is crucial in various fields, including surveying, engineering, and environmental management. Surveyors often begin by creating a traverse, a connected series of straight lines approximating the area's boundary. The coordinates of each traverse point are essential for calculating the enclosed area. The double meridian distance formula is a widely used technique for this purpose. This method utilizes the...
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Cell Migration01:19

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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.
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Chemotaxis and Direction of Cell Migration01:21

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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon...
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Related Experiment Video

Updated: Jan 3, 2026

Behavioral Tracking and Neuromast Imaging of Mexican Cavefish
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The Geography of Undocumented Mexican Migration.

Douglas S Massey1, Jacob S Rugh, Karen A Pren

  • 1Princeton University.

Mexican Studies = Estudios Mexicanos
|September 4, 2010
PubMed
Summary

Undocumented Mexican migration patterns are shifting. Emigration from Mexico is expanding beyond traditional areas, and new U.S. destinations are emerging, with California

Area of Science:

  • Sociology
  • Geography
  • Demography

Background:

  • Historical migration from Mexico to the U.S. has been concentrated in specific regions.
  • Understanding the evolving geographic distribution of migration is crucial for policy and resource allocation.

Purpose of the Study:

  • To analyze the changing geographic organization of undocumented Mexican migration to the United States.
  • To identify shifts in both emigration origins within Mexico and immigrant destinations within the U.S.

Main Methods:

  • Utilized data from Mexico's Matrícula Consular program.
  • Analyzed geographic patterns of migration over time.

Main Results:

  • Emigration from Mexico has expanded from west-central regions into central, southeast, and border areas.

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  • While traditional U.S. gateways persist, new destinations are emerging, and California's dominance has decreased.
  • The geographic structure of migration, though generally stable, shows continuous evolution.

    • Conclusions:

    • Mexican migration to the U.S. is geographically diversifying.
    • The findings highlight the dynamic nature of migration flows and settlement patterns.