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関連する概念動画

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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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

氷河期の終焉の結末である.

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
まとめ
この要約は機械生成です。

中国のスタラグミットからのアジアモンスーンの降水記録は,過去の氷河終結と正確に相関しています. これは,北半球の夏の太陽熱が氷河期の終結を誘発し,世界の気候とCO2レベルに影響を与えることを確認しています.

さらに関連する動画

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
09:06

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside

Published on: July 3, 2016

Using Generative Art to Convey Past and Future Climate Transitions
06:10

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

関連する実験動画

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

Published on: October 26, 2019

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
09:06

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside

Published on: July 3, 2016

Using Generative Art to Convey Past and Future Climate Transitions
06:10

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

科学分野:

  • 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
  • 地質化学 地質化学
  • 四次科学とは四次科学である.

背景:

  • 過去の氷河期の終結を理解することは,将来の気候変動を予測するために極めて重要です.
  • アジアモンスーン (AM) は,世界の気候動態において重要な役割を果たしています.
  • 古気候記録の正確な相関は,過去の気候現象を再構築するために不可欠です.

研究 の 目的:

  • 過去の氷河期におけるアジアモンスーンの降雨を,スタラグミット記録を用いて特徴づけること.
  • AM記録を他の古気候アーカイブ (氷核,海洋堆積物) と正確に相関させるため.
  • 氷河の終結の引き金とメカニズムを調査する.

主な方法:

  • 中国サンバオ洞窟のスタラグミットの230Th年代付け.
  • スタラグミットからの酸素同位体記録の分析.
  • スタラガミットデータと氷芯と海洋沈殿物の記録の相関.

主要な成果:

  • サンバオ洞窟からの酸素同位体記録は,過去4つの氷河終結の詳細なAM降水データを提供しています.
  • AM記録は,氷芯と海洋沈殿物のデータと正確に相関し,イベントのタイミングを確立します.
  • 観測結果は,北半球の夏の太陽照射が氷床の退却の初期トリガーであることを支持しています.

結論:

  • 氷河の終結は,北半球の夏の太陽照射によって開始されます.
  • 北大西洋に流入する融水は,海洋と大気循環を変化させ,地球温暖化に影響を及ぼします.
  • CO2と太陽熱の上昇は,氷床の衰退を促し,海面とCO2の間の潜在的なポジティブなフィードバックをもたらします.