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Related Concept Videos

The Evidence for Evolution02:55

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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Gene Evolution - Fast or Slow?02:05

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Molecular Evolution of the Tre Recombinase
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Galex: Exploring the Evolution and Intersection of Disciplines.

Zeyu Li, Changhong Zhang, Shichao Jia

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    |August 24, 2019
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    Galaxy Evolution Explorer (Galex) visualizes science evolution and interdisciplinary connections. This system helps researchers rapidly understand how scientific fields change and interact across different levels of detail.

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    Area of Science:

    • Bibliometrics and Scientometrics
    • Information Visualization
    • Text Mining

    Background:

    • Understanding scientific evolution and interdisciplinary connections is crucial for identifying emerging trends and predicting future research directions.
    • Existing methods often lack detailed exploration, interpretation, or a high-level perspective on scientific development.
    • A gap exists in systems that effectively visualize the macro-perspective of scientific evolution and topic intersections.

    Purpose of the Study:

    • To design and implement a hierarchical visual analysis system, Galaxy Evolution Explorer (Galex), to aid analysts in comprehending scientific discipline evolution and intersections.
    • To provide a system that bridges the gap between detailed topic-level analysis and a high-level macro-perspective of science.
    • To enable rapid comprehension of the dynamics within scientific fields.

    Main Methods:

    • Development of the Galaxy Evolution Explorer (Galex) system, integrating advanced text mining with a hierarchical visual analysis framework.
    • Implementation of a three-level structure: discipline, area, and institution levels, for progressively fine-grained exploration.
    • Incorporation of interactive features, including a flexible spotlight component and a tree metaphor, for intuitive exploration and comparison.

    Main Results:

    • Galex enables analysts to explore historical scientific data and knowledge spaces at various granularities.
    • The system facilitates intuitive perception of topic expansion, decline, and intersection through its visual metaphors.
    • Synchronous spotlight interactions allow for easy comparison of research content across different institutions.

    Conclusions:

    • The Galaxy Evolution Explorer (Galex) system effectively addresses the need for a comprehensive tool to visualize scientific evolution and interdisciplinary relationships.
    • The hierarchical structure and interactive components of Galex empower analysts to gain rapid insights into the dynamics of scientific fields.
    • Case studies demonstrate the system's effectiveness in analyzing and understanding the complex landscape of scientific research.