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Related Concept Videos

Ideal Solutions02:24

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
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General Properties of Solutions02:12

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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Standard solutions refer to solutions with a precisely known concentration or composition. A primary standard is a highly pure, high molar mass, stable substance that is entirely soluble in water, the most commonly used solvent in analytical chemistry. The primary standard solution can be used to standardize secondary standards, which are substances with known concentrations but are less pure and stable. Standard solutions are essential for achieving accurate and reliable results in analytical...
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Blank Solutions00:56

Blank Solutions

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A blank solution is a solution that does not contain the analyte, or the substance of interest being tested or measured. It is typically prepared using the same reagents and procedure as the sample solution but without adding the analyte. The primary purpose of preparing a blank solution is to account for any background interference or contamination that may affect the accuracy and reliability of the analytical method.
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Updated: Jan 30, 2026

Arterial Pouch Microsurgical Bifurcation Aneurysm Model in the Rabbit
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Surgical solutions for refractory J-pouch inlet obstruction.

M M Sellers1, B M Elnekaveh1, S J Hahn1

  • 1Department of Surgery, Icahn School of Medicine at Mount Sinai, New York, New York, USA.

Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland
|February 2, 2019
PubMed
Summary

Pouch salvage surgery can successfully treat J-pouch inlet obstructions in ulcerative colitis patients refractory to other treatments. This approach allows patients to retain their pouches with good functional outcomes, avoiding pouch resection.

Keywords:
ileal pouch-anal anastomosisobstructionsalvage

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Area of Science:

  • Gastroenterology
  • Colorectal Surgery
  • Surgical Innovation

Background:

  • Total proctectomy with ileal pouch-anal anastomosis is a common treatment for ulcerative colitis.
  • J-pouch inlet obstructions can be difficult to manage nonoperatively or endoscopically.
  • Historically, refractory obstructions often necessitated pouch resection.

Purpose of the Study:

  • To evaluate the feasibility and outcomes of pouch salvage surgery for J-pouch inlet obstructions.
  • To assess the long-term functional results and complication rates of these salvage procedures.

Main Methods:

  • Retrospective review of patients undergoing pouch salvage for J-pouch inlet obstructions (2000-2017).
  • Data collection included demographics, workup, surgical intervention, and outcomes.
  • Analysis of different surgical techniques for strictures, angulations, and internal hernias.

Main Results:

  • Eight patients with J-pouch inlet obstructions underwent salvage surgery.
  • Six patients had strictures/angulations treated by bypass or resection/re-anastomosis.
  • Two patients with internal hernias/volvulus were treated; all pouches were retained at mean 36.5 months follow-up.
  • Mean daily bowel movements were eight; two major and two minor complications occurred.

Conclusions:

  • J-pouch inlet obstructions can develop over time and may become refractory to non-surgical management.
  • Pouch salvage surgery offers good functional results for patients with refractory obstructions.
  • Awareness of novel surgical techniques is crucial given the increasing number of J-pouches performed.