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Migration00:53

Migration

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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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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Cell Migration01:19

Cell Migration

6.1K
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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Cell Migration01:09

Cell Migration

16.6K
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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Quantifying Work02:30

Quantifying Work

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As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the surroundings to the system.
18.4K
Transport Number01:31

Transport Number

230
The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
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相关实验视频

Updated: May 1, 2026

Quantitative Analysis of Random Migration of Cells Using Time-lapse Video Microscopy
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Quantitative Analysis of Random Migration of Cells Using Time-lapse Video Microscopy

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量化全球国际移民流动的量化.

Guy J Abel1, Nikola Sander

  • 1Wittgenstein Centre for Demography and Global Human Capital (IIASA, VID/ÖAW, WU), Vienna Institute of Demography (Austrian Academy of Sciences), Wohllebengasse 12-14, Vienna, 1040, Austria.

Science (New York, N.Y.)
|March 29, 2014
PubMed
概括
此摘要是机器生成的。

自1995年以来,全球移民流动保持稳定,占世界人口的0.6%,在南亚/西亚,拉丁美洲/北美和非洲之间观察到主要的移动. 这项研究提供了全面的双边流量数据.

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Quantitative Analysis of Random Migration of Cells Using Time-lapse Video Microscopy

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Analysis of Shear Flow-induced Migration of Murine Marginal Zone B Cells In Vitro
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科学领域:

  • 人口统计学 人口统计学
  • 社会学 社会学 社会学
  • 国际关系 国际关系

背景情况:

  • 现有的国际移民数据不充分反映当前的全球流动模式.
  • 全面的双边移民流数据对于了解全球人口流动至关重要.

研究的目的:

  • 介绍1990-2010年196个国家之间的双边国际移民流的综合数据集.
  • 分析全球移民流动的强度,模式和趋势.

主要方法:

  • 利用了196个国家的双边流量数据,涵盖了20年的时间 (1990-2010年).
  • 分析了移民强度作为全球人口的百分比,在5年间隔.

主要成果:

  • 自1995年以来,全球5年移民流动强度一直保持稳定,约占世界人口的0.6%.
  • 确定了主要的移民走廊:南亚和西亚,拉丁美洲到北美,以及非洲内部的移动.
  • 这些数据有助于对各个国家的移民趋势进行上下文解释.

结论:

  • 在过去的二十年中,全球移民强度显示出了显著的稳定性.
  • 双边数据为了解国家和地区移民动态提供了必要的背景.
  • 仍然存在显著的区域移民模式,特别是在亚洲,美洲和非洲.