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Free-falling Bodies: Introduction01:07

Free-falling Bodies: Introduction

All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is not the case.
Free-falling Bodies: Example01:05

Free-falling Bodies: Example

An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
The...
Finding the Center of Gravity01:03

Finding the Center of Gravity

The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate is...
Composite Bodies00:55

Composite Bodies

A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
Composite bodies have widespread applications in mechanical engineering, from automobiles to aircraft to rockets. For example, an automobile wheel comprises...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...

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Updated: Jul 17, 2026

3D Whole-heart Myocardial Tissue Analysis
06:53

3D Whole-heart Myocardial Tissue Analysis

Published on: April 12, 2017

カビタン・ポルフィリンズ (Cavitan-porphyrins) とは

S D Starnes1, D M Rudkevich, J Rebek

  • 1The Skaggs Institute for Chemical Biology and The Department of Chemistry, The Scripps Research Institute, MB-26, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Journal of the American Chemical Society
|July 18, 2001
PubMed
まとめ

新しいナノスケール容器分子は,キャビタンとメタルポルフィリンのハイブリッドであり,高いゲスト結合親和性を表しています. これらの運動的に安定した宿主体は,選択的なゲスト結合と金属触媒反応の可能性を可能にします.

科学分野:

  • 超分子化学 超分子化学
  • ナノテクノロジー ナノテクノロジー
  • 有機化学 オーガニック・ケミストリー

背景:

  • キャビタンドは,ゲスト分子をカプセル化できる分子宿主です.
  • メタロポルフィリン (metalloporphyrins) は,触媒とセンシングにおける応用を持つ多用途のマクロサイクルである.
  • 複雑な分子アーキテクチャの設計には,自己組み立てと共振結合の正確な制御が必要です.

研究 の 目的:

  • カビタンとメタルポルフィリンを統合した新しいナノスケール容器分子 (7および8) を合成し,特徴づけること.
  • これらの新しい分子容器のゲスト結合特性と安定性を調査するために.
  • 選択的ゲスト認識と触媒のためのこれらの容器の潜在能力を探求する.

主な方法:

  • カビタン・メタルポルフィリン混合体の共振合成.
  • UV/Visおよび1H NMRスペクトロスコーピーを用いて特徴づけました.
  • アダマンチルおよびピリジルを含むゲストによる拘束研究.

主要な成果:

  • 10×25Aまでのサイズのナノスケール容器7と8の合成が成功しました.
  • ゲストに対する高い結合親和性があり,キャビタン・キャビティとメタルポルフィリン壁の両方が貢献しています.

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Body Composition and Metabolic Caging Analysis in High Fat Fed Mice

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Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
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Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

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関連する実験動画

Last Updated: Jul 17, 2026

3D Whole-heart Myocardial Tissue Analysis
06:53

3D Whole-heart Myocardial Tissue Analysis

Published on: April 12, 2017

Body Composition and Metabolic Caging Analysis in High Fat Fed Mice
10:28

Body Composition and Metabolic Caging Analysis in High Fat Fed Mice

Published on: May 24, 2018

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
10:23

Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

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  • 内部分子内の水素結合により形成される動力学的に安定した複合体は,ゲスト交換に抵抗します.
  • 容器8による対対のゲスト選択が示され,熱分子複合体を形成した.

    • 結論:

    • 合成されたナノスケール容器は,重要な結合能力を持つ高度な超分子アーキテクチャを表しています.
    • キャビタンズとメタルポルフィリンの統合は,ホスト-ゲストの相互作用と動的安定性の強化につながります.
    • これらの分子容器は,分子認識,分離,および触媒の応用が有望である.