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関連する概念動画

Determination of Michaelis Constant and Maximum Elimination Rate01:20

Determination of Michaelis Constant and Maximum Elimination Rate

444
The Michaelis constant (KM) and the theoretical maximum process rate (Vmax) are vital parameters in the Michaelis-Menten equation, central to many biochemical reactions. They provide essential insights into enzyme kinetics and drug metabolism.
These parameters can be estimated by analyzing plasma concentration data post-drug administration. A notable example of this application is phenytoin, a drug with capacity-limited kinetics. It's recommended that phenytoin should be administered at two...
444
Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations

239
Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
239
Maximum Deflection01:13

Maximum Deflection

1.0K
When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
The maximum deflection occurs at a specific point, known as point O, where the tangent to the deflection curve is horizontal. To find point O, the slope of the tangent at any...
1.0K
Maximum Power Transfer01:16

Maximum Power Transfer

843
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
843
Maximum Size of Aggregate01:12

Maximum Size of Aggregate

528
The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can...
528
The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

1.2K
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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関連する実験動画

Updated: Jan 22, 2026

Analysis of Non-Human Primate Pancreatic Islet Oxygen Consumption
07:12

Analysis of Non-Human Primate Pancreatic Islet Oxygen Consumption

Published on: December 18, 2019

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酸素消費量と拡散抵抗の両方が最大根長を決定する

Juan de la Cruz Jiménez1, Ole Pedersen1,2

  • 1Department of Biology, University of Copenhagen, Universitetsparken 4, 3rd floor, 2100 Copenhagen, Denmark.

Journal of experimental botany
|January 20, 2026
PubMed
まとめ

植物は、内部酸素(O₂)拡散を改善するか、または低い呼吸によって酸素消費を削減することによって、洪水土壌でより長い根を成長させることができる。どちらの戦略も、酸素が限られている場合に好気的機能を維持するのに役立つ。

背景:

  • 分子状酸素(O₂)は植物の好気的代謝に不可欠であるが、植物組織におけるその不均一な分布は生存のための課題を生み出す。
  • 内部酸素勾配は、酸素供給(拡散)と需要(呼吸)の間のバランスによって駆動される。
  • 従来の調査では、酸素拡散のための通気組織のような構造的適応に焦点を当てていたが、代謝的要因は見過ごされがちであった。

結論:

  • 植物の構造と代謝活動の両方を考慮した複合アプローチが、内部通気の理解に不可欠である。
  • 低い呼吸による酸素消費の削減は、洪水下での根の成長を促進するための非常に効果的な戦略である。
  • 植物は、低酸素環境に適応するために、酸素拡散の強化と酸素需要の削減を含む相補的な戦略を持っている。
キーワード:
通気組織拡散酸素消費酸素抵抗呼吸組織多孔性

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