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Energy Diagrams - I01:14

Energy Diagrams - I

The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the interpretation of the dynamics of the system becomes even simpler.
Take the example of a skater on a parabolic ramp. The potential energy at different points along the ramp will be proportional to the height of the ramp, which varies quadratically with the horizontal position on the ramp. As the skater moves down the ramp from the highest position,...
Two-Dimensional Force System01:20

Two-Dimensional Force System

A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
Free-body Diagrams: Problem Solving01:30

Free-body Diagrams: Problem Solving

Free-body diagrams are essential tools for physicists and engineers studying the motion of objects. Free-body diagrams are graphical representations of the object or system under consideration, and they focus solely on the essential forces acting on the object. This tool helps break down complex problems into simpler models that are easier to understand and solve.
For example, consider a block with a mass of 10 kg released on an inclined plane at an angle of 30° to the horizontal, where the...
Cartesian Form for Vector Formulation01:26

Cartesian Form for Vector Formulation

The Cartesian form for vector formulation is a process to calculate  the moment of force using the position and force vectors. The moment of force is defined as the cross-product of these vectors, making it a vector quantity. The Cartesian form of the position and force vectors involves unit vectors, which can be used to express the cross-product in determinant form.
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...

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関連する実験動画

Updated: Jul 11, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

モルフォゲン・グラデント形成の動態学

Anna Kicheva1, Periklis Pantazis, Tobias Bollenbach

  • 1Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauer Strasse 108, 01307 Dresden, Germany.

Science (New York, N.Y.)
|January 27, 2007
PubMed
まとめ
この要約は機械生成です。

デカペンタプレジック (Dpp) と無翼 (Wg) の形態遺伝子の拡散は,ハエの翼によって異なります. Dppの拡散には,Wgとは異なり,エンドサイトーシスと細胞内密輸が必要であり,位置情報のための明確な細胞機構を明らかにします.

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A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules

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Experimental Methods to Study Human Postural Control
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Experimental Methods to Study Human Postural Control

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関連する実験動画

Last Updated: Jul 11, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules
11:25

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules

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科学分野:

  • 発達生物学 発達生物学について
  • 細胞生物学 細胞生物学
  • 遺伝学 遺伝学とは

背景:

  • デカペンタペリジック (Dpp) やウィングレス (Wg) のような分泌されるモルフォゲンは,位置情報に不可欠な,ハエの翼の発達における濃度グラデーションを確立します.
  • Dppは,Wgと比較してより長い範囲の傾斜を示しており,その拡散メカニズムの違いを示唆しています.

研究 の 目的:

  • モルフォゲンの拡散を制御する運動パラメータを調査し,DPPとWGのグラデント形成を制御する明確なメカニズムを理解する.
  • DppとWgの差異的な広がり範囲の背後にある細胞のプロセスを解明する.

主な方法:

  • 4つの主要な運動パラメータの定量化:生産率,有効拡散係数,分解率,およびDppとWgの両方の不動分数.
  • DppとWgの拡散におけるダイナミン依存性エンドサイトーシスの役割の評価.

主要な成果:

  • モルフォゲンの拡散を制御する4つの運動パラメータは,Wgと比較してDppの明確な値を示した.
  • ダイナミン依存性エンドサイトーシスは,Dppの伝播には不可欠であるが,Wgの伝播には欠かせないと特定された.

結論:

  • DppとWgの拡散に起因する細胞機構は根本的に異なる.
  • Dppの拡散は,内細胞および細胞内トラフィックの経路に依存し,長距離シグナル伝達のユニークなメカニズムを強調しています.