Filtration Steps
Filtration Steps - Related Videos
01:32
Filtration and Urine Formation
0 Views •
2019
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. Blood enters the renal...
01:26
Glomerular Filtration: Net Filtration Pressure
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2025
Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP). GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal tubule,...
00:53
Filtration
0 Views •
2024
Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
05:58
Large Volume (20L+) Filtration of Coastal Seawater Samples
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Cited by 16 •
2009
This video documents large volume (≥20 L) filtration of microbial biomass, ranging between 0.22μm and 2.7μm in diameter, from the water column.
10:58
Isolation of Fecal Bacteria from Water Samples by Filtration
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner The quality of water destined for use in agricultural, recreational, and domestic settings is of great importance due to the potential for outbreaks of waterborne disease. Microbial agents implicated in such events include parasites, bacteria, and viruses that are shed in high numbers in the feces of infected people and animals. Transmission to new and susceptible hosts may...
FAQs
The filter material, pore size, and flow conditions each shape the balance among recovery, purity, and processing efficiency. Pore size influences whether particles remain on the filter or move onward, while gravity, pressure, or vacuum changes how fluid passes through. Considering these variables together helps tailor filtration for a particular biological sample.
Using filters in sequence separates processing stages. An initial, coarser step can remove debris, after which a finer filter addresses smaller particulate material. This staged approach can improve separation compared with relying on a single filter, while the selected materials and conditions still determine how efficiently desired components are recovered.
Gravity, pressure, and vacuum provide different ways to drive fluid through the filter medium. The driving condition affects how efficiently processing proceeds and interacts with pore size and filter material. In biological work, selecting the available driving force alongside these other variables helps control the balance between sample recovery, purity, and processing efficiency.
A practical workflow starts by choosing the filter material and pore size for the components being processed. The sample then passes through one or more filters under gravity, pressure, or vacuum, with debris or other retained material separated from the fluid that continues onward. Sequential stages can refine the preparation before analysis.
In biology, filtration steps are useful during cell and tissue processing, where removing particulate contaminants can prepare material for later work. They also support sample concentration, isolation of materials, and preparation of solutions. The appropriate sequence depends on whether the priority is cleaner material, retained components, or efficient handling of the sample.
The main outcomes to evaluate are recovery, purity, and processing efficiency. A sequence that retains too much unwanted material may reduce purity, whereas conditions that do not preserve the needed components can lower recovery. Reviewing these outcomes helps determine whether the chosen filter arrangement and flow conditions are suitable for downstream biological analysis.