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Inertial Frames of Reference01:03

Inertial Frames of Reference

8.7K
Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

7.1K
A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
7.1K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.3K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.3K
Prediction Intervals01:03

Prediction Intervals

3.3K
The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y. 
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Common Ion Effect03:24

Common Ion Effect

46.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
46.0K
Confidence Intervals01:21

Confidence Intervals

10.2K
An unbiased point estimate is often insufficient to predict a population estimate, such as population mean or population proportion. In this scenario, a confidence interval is used. A confidence interval is an estimate similar to a  sample proportion. However, unlike the point estimate which is a single value, the confidence interval  contains a range of values. These values have lower and upper limits, known as confidence limits, and can be designated as L1 and L2, respectively.
A...
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Implementation of a Reference Interferometer for Nanodetection
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骨粗鬆症における骨代謝マーカーの共通参照基準値の提案

S A Paul Chubb1, Samuel D Vasikaran2

  • 1Pathology and Laboratory Medicine, Medical School, University of Western Australia, Perth, WA, Australia.

Pathology
|January 21, 2026
PubMed
まとめ

本研究では、骨粗鬆症の診断に役立つP1NPおよびβ-CTXなどの骨代謝マーカー（BTM）の共通参照基準値を確立する。BALPおよびTRACP5bについては、臨床現場での方法別基準値の必要性を強調する。

キーワード:
骨特異的アルカリホスファターゼI型コラーゲンC末端架橋ペプチドI型コラーゲンN末端プロペプチドプール分析参照骨代謝マーカー成人参照基準値酒石酸抵抗性酸性ホスファターゼ5b

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科学分野:

  • 生化学
  • 臨床化学
  • 内分泌学

背景:

  • 血清プロコラーゲンI型N末端プロペプチド（P1NP）およびI型コラーゲンβ-C末端テロペプチド（β-CTX）は、骨粗鬆症の確立された骨代謝マーカー（BTM）である。
  • 骨アルカリホスファターゼ（BALP）および酒石酸抵抗性酸性ホスファターゼ5b（TRACP5b）は、現在、慢性腎臓病関連骨粗鬆症に認識されている。
  • これらのBTMの標準化された参照基準値に対する臨床的ニーズがある。

研究 の 目的:

  • 自動測定法を用いたP1NP、β-CTX、BALP、TRACP5bの候補共通参照基準値を開発すること。
  • 成人集団におけるこれらの基準値を確立するため、現在の文献データを統合すること。

主な方法:

  • 指定されたBTMの参照基準値を報告する研究を特定するために、系統的文献レビューを実施した。
  • 31の研究からのデータをプールし、方法、年齢、性別、および基準値範囲を分析した。
  • 異なる人口統計グループの加重平均および信頼区間を計算した。

主要な成果:

  • P1NPの共通参照基準値は、iSYSおよびCobas法で適用可能であることが判明した。
  • iSYSおよびCobas β-CTXアッセイには、異なる参照基準値が必要である。
  • iSYSおよびBeckman Ostase BALPアッセイには、個別の参照基準値が必要である。TRACP5bの自動測定法に関するデータは限定的であった。

結論:

  • 主要なBTMの候補共通参照基準値が臨床使用のために開発された。
  • 本研究結果は、既存の基準値の改訂を支持し、特にTRACP5b自動測定アッセイに関するさらなる研究が必要な分野を特定する。