Sieve Filtration
Sieve Filtration - Related Videos
01:32
Filtration and Urine Formation
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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,...
01:19
Sieve Analysis and Grading Curves
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2024
Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps: The required quantity of dried sample of aggregate is weighed. The weighed aggregates are sieved through a set of sieves with square openings arranged in descending order of aperture size, with the largest mesh on top (Column 1 of Table 1). The stack of sieves is shaken or vibrated to facilitate the sorting of particles by size. After sieving for a...
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...
14:16
A New Application of the Electrical Penetration Graph (EPG) for Acquiring and Measuring Electrical Signals in Phloem Sieve Elements
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Cited by 24 •
2015
Electrical Penetration Graph (EPG) is a well-established technique for studying the feeding behavior of stylet-bearing insects. Here we show a new application of EPG as a non-invasive tool for the acquisition of intracellular electrophysiology recordings of sieve elements (SEs), the cells that form the phloem vasculature in plants.
FAQs
Mesh opening sets the size boundary between particles that pass through the screen and those retained above it. Using different openings produces different size fractions and can change the apparent particle-size distribution of the same environmental sample. This relationship allows researchers to compare sediments, soils, suspended solids, or particulate contaminants according to defined size ranges.
Particle-size results depend not only on the screen but also on sample characteristics and processing conditions. Differences in the material being examined or in how it is passed through the mesh can alter the distribution among retained and passing fractions. Controlling these factors is important when comparing environmental samples or evaluating changes between locations and treatments.
Separating a sample into size fractions reveals how its solid material is distributed across particle-size ranges. Those fractions can then support physical and chemical analysis rather than treating the entire sample as uniform. In environmental investigations, this improves interpretation of sediment quality, particulate contaminants, and the characteristics of suspended solids in water or wastewater.
Sieve Filtration separates material through a physical size criterion rather than by chemically identifying or transforming its components. The mesh retains larger particles and allows smaller ones to pass, creating fractions for later examination. Its value lies in organizing heterogeneous environmental material by particle size before physical or chemical analyses are performed.
A basic workflow begins by selecting a mesh or perforated screen appropriate to the particle-size range of interest. The sample is then passed through the screen, while larger material is retained and smaller material is collected after passing through. The resulting fractions can be characterized, compared, or prepared for subsequent physical and chemical analysis.
Researchers apply the technique to characterize sediment and soil particle-size distributions and to examine processes such as transport and erosion. Comparing fractions can show how environmental materials differ among samples or settings. These results provide physical context for sediment-quality assessments and help organize material for further investigation of its composition or behavior.
In water and wastewater work, the method helps characterize suspended solids and particulate contaminants according to size. The resulting distribution can be used to assess the physical nature of the particulate material and to evaluate treatment performance. Because the fractions are separated mechanically, they can also serve as standardized samples for later physical or chemical analysis.