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Buffers02:56

Buffers

A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
Frames01:30

Frames

Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
Frames: Problem Solving I01:24

Frames: Problem Solving I

Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
Frames: Problem Solving II01:26

Frames: Problem Solving II

Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak acid...
Buffers: Overview01:30

Buffers: Overview

Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).

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関連する実験動画

Updated: Jun 23, 2026

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation
09:34

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

Published on: September 14, 2017

フレームカウントのリザーブ数です.

Martin G Stoel1, Felix Zijlstra, Cees A Visser

  • 1Hospital of the Free University, Department of Cardiology, Amsterdam, The Netherlands. mg.stoel@vumc.nl

Circulation
|June 11, 2003
PubMed
まとめ
この要約は機械生成です。

TIMIのフレームカウントリザーブ (FCR) は,冠動脈の流れ速度リザーブ (CVR) を推定することができます. この血管図法では,冠動脈狭窄の有意性をキャセテリゼーション研究室で評価するための貴重な代替手段を提供します.

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Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice

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関連する実験動画

Last Updated: Jun 23, 2026

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation
09:34

A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation

Published on: September 14, 2017

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Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

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科学分野:

  • 心臓病学 心臓病学
  • 介入性心臓病学 介入性心臓病学
  • 診断用イメージング

背景:

  • 冠動脈流動速度準備 (CVR) は冠動脈狭窄を評価しますが,介入心臓科医を必要とします.
  • カテーテリゼーションラボでの日常的な使用には,代替の血管図法が必要である.

研究 の 目的:

  • TIMIのフレームカウントリザーブ (FCR) とCVRとの関係を調査する.
  • FCRがCVRの血管学的代理として機能できるかどうかを判断する.

主な方法:

  • 38人の患者でLADとLCxの相対FCRとCVRを計算した.
  • 計測された容器長と計算されたフレームカウントの流れ速度.
  • FCRとCVRを比較し,相対FCRとCVRを比較した.

主要な成果:

  • FCRとCVR (r=0.62) と相対FCRと相対CVR (r=0.84) の間には強い相関が見られた.
  • LADとLCxの間の平均FRCとCVRの有意な差異はありません.
  • 船舶の長さとTIMIフレームカウントはLADとLCxの間で著しく異なっていたが,フロー速度と体積フローの推定値はそうではなかった.

結論:

  • 相対的なフレームカウントリザーブ (FCR) は,相対的な冠動脈流速リザーブ (CVR) を効果的に推定することができます.
  • FCRは,冠動脈狭窄症の有意性を評価するための有効な血管検査の代替手段を提供します.