Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

The Fossil Record02:56

The Fossil Record

26.9K
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...
26.9K
What is Evolutionary History?02:35

What is Evolutionary History?

42.7K
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.
42.7K
Cleavage and Blastulation01:33

Cleavage and Blastulation

49.3K
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
49.3K
Cloning of Dolly the Sheep01:08

Cloning of Dolly the Sheep

6.6K
The first successfully cloned mammal was Dolly, a sheep, born on 5th July 1996 at Roslin Institute, Scotland. The cloned sheep was named after the American singer Dolly Parton. Dolly lived for seven years and died of respiratory complications, which is speculated to be due to the actual age of her DNA. Because the DNA in cloned cells belongs to an older individual,  the cloned individual’s life expectancy may be affected. Indeed, analysis of Dolly’s DNA revealed shorter...
6.6K
Fertilization01:38

Fertilization

88.2K
During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
88.2K
Conditions on Early Earth02:06

Conditions on Early Earth

100.0K
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.
100.0K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Paleotribological models using preserved fossil tissue properties reveal functional significance of Eurasian mammoth dental evolution.

Acta biomaterialia·2026
Same author

Scoping Review of the Environmental and Human Health Effects of Rural Alaska Landfills.

International journal of environmental research and public health·2026
Same author

A diminutive tyrannosaur lived alongside <i>Tyrannosaurus rex</i>.

Science (New York, N.Y.)·2025
Same author

Mineralization Controls Informative Biomarker Preservation Associated With Soft Part Fossilization in Deep Time.

Geobiology·2025
Same author

Erratum: Didactyl therizinosaur with a preserved keratinous claw from the Late Cretaceous of Mongolia.

iScience·2025
Same author

A new large hypercarnivorous crocodyliform from the Maastrichtian of Southern Patagonia, Argentina.

PloS one·2025
Same journal

Daily briefing: 'Cyborg' cockroaches breathe underwater with printed suit.

Nature·2026
Same journal

China boosts prestigious grants for young scientists - will it ease competition?

Nature·2026
Same journal

Incoming US science academy chief vows to 'double down' on research.

Nature·2026
Same journal

Author Correction: Synthesis of enantioenriched atropisomers by biocatalytic deracemization.

Nature·2026
Same journal

Electrodeposited self-assembled molecules for perovskite photovoltaics.

Nature·2026
Same journal

Neutrino's nursery found: the 'Shadow Blaster'.

Nature·2026
関連記事をすべて見る

関連する実験動画

Updated: Dec 18, 2025

Windowing Chicken Eggs for Developmental Studies
15:01

Windowing Chicken Eggs for Developmental Studies

Published on: October 1, 2007

28.6K

最初の恐竜の卵は 柔らかいものでした

Mark A Norell1, Jasmina Wiemann2, Matteo Fabbri3

  • 1Division of Vertebrate Paleontology, American Museum of Natural History, New York, NY, USA. norell@amnh.org.

Nature
|June 20, 2020
PubMed
まとめ
この要約は機械生成です。

最初の恐竜の卵は 軟殻で 現代の鳥や爬虫類に基づいた以前の仮定に 異議を唱えました この発見は 硬い殻の恐竜の卵が 何度も独立して進化したことを示しています

さらに関連する動画

Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy
09:15

Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy

Published on: August 16, 2019

9.8K
Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay
06:49

Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay

Published on: January 12, 2022

3.5K

関連する実験動画

Last Updated: Dec 18, 2025

Windowing Chicken Eggs for Developmental Studies
15:01

Windowing Chicken Eggs for Developmental Studies

Published on: October 1, 2007

28.6K
Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy
09:15

Processing Embryo, Eggshell, and Fungal Culture for Scanning Electron Microscopy

Published on: August 16, 2019

9.8K
Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay
06:49

Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay

Published on: January 12, 2022

3.5K

科学分野:

  • 古生物学
  • 進化生物学
  • バイオミネラル化

背景:

  • 現代の鳥やワニは 硬い殻の卵を産み, 鳥類以外の恐竜にも 硬い殻があったと推論される.
  • 既知の恐竜の卵殻は,主要なクラードの中で明確な超構造層と毛穴の構成を持つカルシット構造を示しています.
  • 恐竜の卵殻の化石記録は稀で,その進化と同質性についての包括的な理解を妨げています.

研究 の 目的:

  • プロトセラトプスとムサウルの 特別に保存された恐竜の卵殻の 元の組成と超構造を調査する.
  • この恐竜の卵は 硬殻か 軟殻か
  • 恐竜の卵殻の組成と構造の 進化史を再構築する

主な方法:

  • 化石の卵殻に鉱物学的,有機化学的,超構造的分析が行われました.
  • 化石と現存する卵殻の組成を分析するために,in situ Ramanスペクトロスコーピーを用いた.
  • 卵殻の構造を比較するために 組織学的検査と祖先状態の再構築が用いられました

主要な成果:

  • 特別に保存されたプロトセラトプスとムサウスの卵は,もともと生物鉱物化されていない軟殻の性質を示しています.
  • この恐竜の卵は 軟殻のカメの卵に似た有機的組成を示しています
  • 最古の恐竜の卵は 軟殻でした

結論:

  • 初期の恐竜の祖先は 軟殻の卵を産んだ
  • 硬い殻の恐竜の卵は,メソゾーイク時代に少なくとも3回独立して進化した.
  • この進化のパターンは 硬い殻の恐竜の卵の化石が 多いことを説明します