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相关概念视频

Phylogeny01:23

Phylogeny

47.2K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
47.2K
What is Evolutionary History?02:35

What is Evolutionary History?

31.1K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
31.1K
The Fossil Record02:56

The Fossil Record

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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
23.0K
Eukaryotic Evolution01:24

Eukaryotic Evolution

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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.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Surface Appendages of Archaea01:23

Surface Appendages of Archaea

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Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
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Origin of Cellular Life01:24

Origin of Cellular Life

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The origin of life on Earth is a complex and enigmatic event rooted in ancient biochemical processes and geological conditions. Experimental evidence supports the hypothesis that life began with the spontaneous formation of organic molecules such as RNA nucleotides, amino acids, and lipids under early Earth conditions. Factors like volcanic activity, intense UV radiation, and a reducing atmosphere without free oxygen likely facilitated these reactions. Hydrothermal vents on the ocean floor are...
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相关实验视频

Updated: May 3, 2026

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
15:28

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources

Published on: September 3, 2009

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阿切乌尔人的早期起源.

Christopher J Lepre1, Hélène Roche, Dennis V Kent

  • 1Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA. lepre@ldeo.columbia.edu

Nature
|September 3, 2011
PubMed
概括

阿尔石器技术在176万年前在肯尼亚出现,早于之前的估计. 它与奥尔多万工具的共存表明,非洲存在着多个具有不同行为方式的人类群体.

科学领域:

  • 古人类学古人类学.
  • 考古学的考古学
  • 地质时间学 (Geochronology)

背景情况:

  • 阿切鲁人技术复合体,由双面石器定义,可能起源于大约100万年前的非洲.
  • 它的出现与人类大脑的进化有关,但由于日期精确的早期遗址的稀缺性,人们对其了解甚少.
  • 以前的理解表明,奥尔多万和阿丘尔技术之间的时间顺序.

研究的目的:

  • 调查阿丘里亚石器技术的起源和早期发展.
  • 为了建立一个更精确的时间表,以首次出现的数据 (FAD) 的阿切鲁人.
  • 探索阿切乌尔和奥尔多瓦技术在早期阶段之间的关系.

主要方法:

  • 在Kokiselei 4考古遗址Nachukui形成的岩石组合的挖掘和分析,西图尔卡纳,肯尼亚.
  • 详细地质上下文化和考古发现的年代.
  • 在协会中发现的阿切乌尔和奥尔多瓦文物对比分析.

主要成果:

  • 在Kokiselei 4发现了典型的早期阿切乌尔人工具,可以追溯到176万年前.
  • 这一发现大大推迟了阿丘勒技术的已建立的FAD大约36万年.
  • 在Kokiselei遗址综合体中记录了Oldowan和Acheulian文物的同时存在.

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Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

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15:28

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources

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A Protocol for Bioinspired Design: A Ground Sampler Based on Sea Urchin Jaws

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Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
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Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

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结论:

  • 阿切鲁人技术至少有176万年历史,起源于非洲.
  • 奥尔多万和阿切乌尔人工具的共存表明,它们并不严格地顺序,挑战了以前的进化模型.
  • 阿丘里亚人的存在并没有与人类最早的从非洲分散相吻合,这表明人类的行为和分散策略各不相同.