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Related Concept Videos

Filtration and Urine Formation01:32

Filtration and Urine Formation

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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
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A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Physiology of Urine Formation01:24

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Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
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There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...
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Related Experiment Video

Updated: Feb 1, 2026

How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
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Cardiovascular Medication Stability in Urine for Non-Adherence Screening by LC-MS-MS.

A D Burns1,2, D Lane1,2, R Cole

  • 1Department of Chemical Pathology and Metabolic Diseases, Level 4, Sandringham Building, Leicester Royal Infirmary, UK.

Journal of Analytical Toxicology
|December 6, 2018
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Summary
This summary is machine-generated.

Cardiovascular medication stability in urine samples is confirmed. This finding ensures that urine drug testing accurately reflects patient adherence, simplifying sample handling for wider clinical use.

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Area of Science:

  • Clinical Chemistry
  • Pharmacology
  • Analytical Chemistry

Background:

  • Urine biochemical testing is crucial for assessing cardiovascular medication adherence.
  • Liquid chromatography tandem mass spectrometry (LC-MS-MS) is the standard laboratory method for drug testing.
  • Pre-analytical factors, such as sample stability, can influence test accuracy.

Purpose of the Study:

  • To evaluate the stability of cardiovascular medications in urine samples.
  • To determine if sample storage conditions impact the accuracy of non-adherence testing.
  • To assess the implications of medication stability for routine clinical practice and research.

Main Methods:

  • Assessed the stability of 29 cardiovascular medications in patient urine samples.
  • Utilized liquid chromatography tandem mass spectrometry (LC-MS-MS) for analysis.
  • Tested samples stored at room temperature (RT) and -80°C.

Main Results:

  • All tested cardiovascular drugs and their metabolites were stable under both room temperature and -80°C storage.
  • No significant degradation or alteration of medication analytes was observed.
  • Medication stability in urine does not appear to be a confounding factor in non-adherence testing.

Conclusions:

  • Cardiovascular drug stability in urine is confirmed, validating LC-MS-MS testing for adherence.
  • Simplified sample handling and transportation procedures are feasible without compromising test integrity.
  • These findings support the broader implementation of urine-based adherence testing in clinical settings and research endeavors.