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Related Concept Videos

Trigonometric Substitution01:23

Trigonometric Substitution

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Trigonometric substitution is a technique used to simplify integrals that contain square root expressions involving quadratic forms. It is particularly effective when the integrand includes terms resembling those found in standard geometric equations, such as circles or ellipses.Molniya satellites follow highly elliptical orbits, repeatedly sweeping out the same regions of space as they revolve around Earth. To estimate the area enclosed by such an orbit, the path is modeled as an ellipse...
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Rationalizing Substitutions01:29

Rationalizing Substitutions

60
Integrals involving non-rational functions are often difficult to evaluate using standard techniques, especially when radicals appear in the integrand. Rationalizing substitution provides a systematic method for simplifying such integrals by converting them into rational forms that are easier to handle.Consider a rod whose linear mass density depends on a constant linear density, a characteristic length, and the distance from the left end of the rod. Determining the total mass requires...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.4K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Evaluating Limits by Direct Substitution01:29

Evaluating Limits by Direct Substitution

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In the analysis of functions that represent continuous physical phenomena, it is often necessary to determine the output value as the input approaches a specific point. When a combination of algebraic terms defines the function and exhibits no discontinuities or abrupt changes near the point of interest, the limit of the function can be evaluated directly. This process, known as direct substitution, involves replacing the variable in the expression with the value it approaches.Direct...
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

15.2K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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Nucleophilic Substitution Reactions02:34

Nucleophilic Substitution Reactions

19.7K
Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
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Tandem High-pressure Freezing and Quick Freeze Substitution of Plant Tissues for Transmission Electron Microscopy
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MR-Imaging of Meniscal Substitution.

Tineke De Coninck1, Peter Verdonk2, Koenraad Verstraete1

  • 1Department of Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium.

Journal of the Belgian Society of Radiology
|August 29, 2018
PubMed
Summary

Meniscal injuries are common, leading to osteoarthritis. Research has evolved from meniscectomy to repair and now focuses on meniscal replacement and advanced MRI imaging for artificial substitutes.

Keywords:
AllograftsImplantsKneeMRIMeniscus

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Area of Science:

  • Orthopedics
  • Biomaterials Science
  • Radiology

Background:

  • The meniscus, once thought vestigial, is crucial for knee function.
  • Meniscectomy and repair have limitations, driving the need for meniscal substitutes.
  • Magnetic Resonance Imaging (MRI) has revolutionized meniscus visualization.

Purpose of the Study:

  • To review the evolution of meniscal treatment and imaging.
  • To highlight current research in meniscal replacement strategies.
  • To discuss the role of MRI in evaluating artificial meniscus replacements.

Main Methods:

  • Literature review of historical and current studies on meniscal injuries and treatments.
  • Analysis of the development of meniscal replacement materials (allogenic, xenogenic, artificial).
  • Examination of advancements in MRI techniques for visualizing native and artificial menisci.

Main Results:

  • Total meniscectomy is linked to osteoarthritis and reduced knee function.
  • Partial meniscectomy has not significantly reduced osteoarthritis prevalence.
  • Current research focuses on meniscal substitutes and their MRI assessment.

Conclusions:

  • Meniscal injuries are prevalent, necessitating innovative treatment strategies.
  • Artificial meniscal substitutes are a key area of ongoing research.
  • MRI plays a vital role in assessing the efficacy and integration of meniscal replacements.