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Changes in the Appendicular Skeleton with Age

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...

Overview of the Axial Skeleton

Overview of the Axial Skeleton

The skeleton is subdivided into two major divisions—the axial skeleton and the appendicular skeleton. The axial skeleton forms the vertical, central axis of the body. It includes all of the bones of the head, neck, chest, and back. It protects the brain, spinal cord, heart, and lungs. It also serves as the attachment site for muscles that move the head, neck, and back and for muscles that act across the shoulder and hip joints to move their corresponding limbs.
The axial skeleton of the...

Introduction to the Skeletal System

Introduction to the Skeletal System

The skeletal system is the central framework of the body, consisting of different connective tissues: bones, cartilage, tendons, and ligaments.
Components of the Skeletal System
Bone, or osseous tissue, is a hard connective tissue that forms an internal support structure for the human body. Bones shield vulnerable organs and soft tissue from external forces. For example, the vertebral bones protect and support the spinal cord.
Cartilage, a semi-rigid connective tissue found in regions such as...

Synteny and Evolution

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...

Carbon Skeletons

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...

Bone Formation by Endochondral Ossification

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...

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Updated: Jul 27, 2025

Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential

Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential

Published on: July 21, 2023

多循環性骨格の進化のための形状変化のロードマップ

Andre Sanchez¹, Anjali Gurajapu¹, Wentao Guo²

¹Department of Chemistry, University of California-Berkeley, 826 Latimer Hall, Berkeley, California 94720, United States.

Journal of the American Chemical Society

|June 6, 2023

まとめ

この要約は機械生成です。

研究者は光と塩基を用いて連続的に異体化できる新しい形状の炭素ケージシステムを開発しましたこの制御可能な分子進化は新材料や新薬のための異体化学空間の探索を可能にします

さらに関連する動画

Culturing and Measuring Fetal and Newborn Murine Long Bones

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

関連する実験動画

Last Updated: Jul 27, 2025

Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential

Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential

Published on: July 21, 2023

Culturing and Measuring Fetal and Newborn Murine Long Bones

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

科学分野:

有機化学
超分子化学
材料科学

背景:

ポリサイクルリングシステムは,生物学的活性分子や有機物質における重要な3D構造モチーフです.
分子形と同位体は,多環化合物の機能と性質を決定的に影響する.
特定の同位体を合成するには,しばしば異なる複雑な合成経路を開発する必要があります.

研究の目的:

制御された同位体探査のための新しいダイナミックな"形状変化"の炭素ケージシステムを開発する.
共通の骨格の祖先を異なった同位体環系に進化させるための化学的設計図を確立する.
空間を通るπ軌道相互作用 (同位結合) がイソメリゼーションを誘導する役割を調査する.

主な方法:

ダイナミックイソメリゼーションを示す新しいC9化学型の開発.
繰り返し化学変換のトリガーとして光と有機基を用いる.
アイソマーネットワークと反応メカニズムを分析するために,コンピューティングと光物理学的研究を使用します.

主要な成果:

共通の骨格の祖先はホモコンジューゲーションによって複合性同位体ネットワークに進化した.
このシステムは2つの化学的ステップのみを使用して制御可能で継続的な異体化を示しています.
アイソメリゼーションを制御する反応性,メカニズム,およびホモコンジューガティブ相互作用に関する基本的な洞察が得られた.

結論:

この研究は制御された連続的異体化が可能である希少な小分子を示しています
この発見は新しいダイナミックで形状が変化する分子システムの合理的な設計の基礎となるものです
このアプローチは,薬物発見と材料科学のために多様な同位体ポリサイクルを合成するための強力なツールを提供します.