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相关概念视频

Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
The Fossil Record02:56

The Fossil Record

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...
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.

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Updated: Jun 19, 2026

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
13:38

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 2019

冰河时代的结束 冰河时代的结束

Hai Cheng1, R Lawrence Edwards, Wallace S Broecker

  • 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA.

Science (New York, N.Y.)
|October 10, 2009
PubMed
概括
此摘要是机器生成的。

来自中国石岩的亚洲季风降水记录与过去的冰川终结精确相关. 这证实北半球夏季阳光是结束冰河时代的触发因素,影响全球气候和二氧化碳水平.

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相关实验视频

Last Updated: Jun 19, 2026

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
13:38

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Using Generative Art to Convey Past and Future Climate Transitions
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Using Generative Art to Convey Past and Future Climate Transitions

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科学领域:

  • 古气候学 古气候学
  • 地质化学 地质化学
  • 四分学科学 四分学科学

背景情况:

  • 了解过去的冰川终结对于预测未来的气候变化至关重要.
  • 亚洲季风 (AM) 在全球气候动态中发挥着重要作用.
  • 古气候记录的精确相关性对于重建过去的气候事件至关重要.

研究的目的:

  • 在过去的冰河时代使用石岩记录来描述亚洲季风降水.
  • 准确地将AM记录与其他古气候档案 (冰芯,海洋沉积物) 相关联.
  • 调查冰川终结的触发因素和机制.

主要方法:

  • 来自中国三宝洞穴的石石的230Th日期.
  • 分析氧同位素记录从石岩.
  • 斯塔拉格米特数据与冰芯和海洋沉积物记录的相关性.

主要成果:

  • 圣宝洞穴的氧同位素记录为过去四个冰川终结提供了详细的AM降水数据.
  • 机械制造记录与冰芯和海洋沉积物数据精确相关,确定事件时间.
  • 观测证实北半球夏季阳光是冰盖退缩的最初触发因素.

结论:

  • 冰川的终结是由北半球夏季阳光照射开始的.
  • 融水涌入北大西洋改变了海洋和大气循环,影响了全球气候.
  • 增加的二氧化碳和阳光照射推动了冰盖的衰退,海平面和二氧化碳之间可能存在积极的反.