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Related Concept Videos

Filtration and Urine Formation01:32

Filtration and Urine Formation

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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The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...
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Hemoperfusion and hemofiltration are critical techniques in medical treatments to eliminate accumulated drugs, metabolites, and electrolytes from the bloodstream. These methods are particularly vital in cases of accidental poisoning and drug overdose.Hemoperfusion involves passing blood through an adsorbent material to remove unwanted substances. The main adsorbents used in hemoperfusion include activated charcoal and Amberlite resins. Activated charcoal can adsorb both polar and nonpolar...
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Continuous Renal Replacement Therapy (CRRT) is an essential intervention for patients experiencing severe kidney dysfunction. This therapy offers a continuous mechanism for removing fluids and toxins from the bloodstream, leveraging the patient’s blood pressure to facilitate filtration through a specialized filter. This method contrasts with intermittent dialysis, providing a gentler and more consistent removal of waste products and excess fluid, which is particularly beneficial in critically...

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Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
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STUDIES IN ULTRAFILTRATION.

H Zinsser1, F F Tang

  • 1Department of Bacteriology and Immunology, Harvard University Medical School, Boston.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

This study used ultrafiltration to estimate the size of bacteriophages and viruses, finding they are larger than proteins like casein but smaller than colloidal arsenic. These findings aid in understanding virus and bacteriophage characteristics.

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Area of Science:

  • Virology
  • Biochemistry
  • Filtration Science

Background:

  • Accurate size determination of viruses and bacteriophages is crucial for understanding their nature and behavior.
  • Previous methods for size estimation had limitations, necessitating the exploration of new techniques.
  • Enzymes like trypsin and proteins such as casein serve as important size references in biological studies.

Purpose of the Study:

  • To estimate the relative sizes of bacteriophages and viruses using ultrafiltration.
  • To compare the sizes of bacteriophages and viruses with known proteins and colloidal particles.
  • To evaluate the potential of ultrafiltration as a standardized method for size determination in microbiology.

Main Methods:

  • Utilized ultrafiltration through collodion membranes with controlled pore sizes.
  • Filtered various substances including crystallized egg albumen, serum albumen, casein, trypsin, bacteriophage, Rous sarcoma virus, and herpes virus.
  • Compared filtration results with colloidal arsenic trisulfide and collargol as size standards.

Main Results:

  • Bacteriophage, Rous sarcoma virus, and herpes virus were found to be larger than casein and collargol but smaller than colloidal arsenic trisulfide.
  • Estimated sizes for these biological agents ranged between 20 and 100 millimicrons, aligning with previous studies.
  • Herpes virus filtration was challenging, likely due to its association with brain material, suggesting an intracellular location.

Conclusions:

  • Ultrafiltration provides a viable method for estimating the size of viruses and bacteriophages.
  • The findings support the classification of bacteriophages and certain viruses as distinct entities comparable in size.
  • The developed ultrafiltration technique shows promise for standardization in investigating bacteriological and immunological problems.