Porous Membranes
Porous Membranes - Related Videos
07:06
Isolation and Quantification of Axonal mRNAs Using Porous Membrane Inserts and RTddPCR
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Cited by 1 •
2026
This study presents a robust method to isolate axonal mRNAs using porous membrane inserts, enabling total neuron vs. neurite separation and RNA purification. Combined with RTddPCR, the approach allows absolute quantification of low-copy transcripts, facilitating studies of mRNA transport and local translation with high sensitivity, reproducibility, and broad experimental applicability.
09:05
Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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Cited by 9 •
2015
Nitrogen is an effective supercritical fluid for extraction or drying processes due to its small molecular size, high density in the near-liquid supercritical regime, and chemical inertness. We present a supercritical nitrogen drying protocol for the purification treatment of reactive, porous materials.
02:51
Differentiating Human Neuronal Stem Cells into 3D Culture Using a Porous Scaffold
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2025
This video showcases the development and differentiation of human neural stem cells within a three-dimensional scaffold. A laminin coating on the scaffold promotes cell attachment, while a growth factor-free neural medium induces cell differentiation into neural progenitor cells, which extend their processes within a porous architecture in multiple directions, forming a three-dimensional...
07:32
Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
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Cited by 10 •
2017
This paper reports practical methods to prepare hydrogels in freestanding films and impregnated membranes and to characterize their physical properties, including water transport properties.
10:29
A Microfluidic Platform to Investigate Microbial Precipitation of Metal Oxides in Porous Media
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2026
This protocol presents a microfluidic system for studying the microbial precipitation of manganese oxide minerals. Biomineral formation is measured in situ with optical microscopy and image analysis. This approach can be adapted to investigate the precipitation of other distinctively colored biogenic minerals in porous environments.
FAQs
Transport reflects the combined effects of the membrane’s structural features rather than any single measurement. Pore size influences which molecules or particles can pass, while porosity describes the extent of available pore space. Membrane thickness adds another structural variable that affects the transport path. Considering these properties together helps researchers tune separation and movement for a biological system.
Pressure and concentration gradients provide the forces that move materials across porous membranes. A pressure difference can promote fluid passage, whereas a concentration difference can drive redistribution of substances. The resulting movement is then constrained by pore dimensions and membrane interactions. Researchers therefore control or interpret transport by relating the applied gradient to the membrane’s selective properties.
Size exclusion is only one basis for selectivity. Surface charge can affect whether substances interact favorably or unfavorably with the membrane, while hydrophobic interactions influence passage according to the chemical character of the membrane and transported material. These effects may change which molecules cross even when their sizes are similar, making surface chemistry important in biological separations.
Selection begins with the material that must pass and the material that must be retained. Researchers compare pore size, porosity, surface chemistry, and thickness with the desired separation, then consider whether pressure or concentration gradients will provide transport. This property-based approach supports choices for filtration, dialysis, contaminant removal, and other systems requiring controlled molecular or particle movement.
A biological transport experiment can apply a pressure gradient to move fluid through the membrane or establish a concentration gradient to promote movement of dissolved substances. Researchers then assess which molecules, particles, or contaminants pass and which remain separated. These approaches support filtration and dialysis studies, where membrane properties determine the resulting separation and transport behavior.
In biology, porous membranes provide controlled interfaces for several distinct purposes. Filtration and dialysis use selective passage to separate materials or remove contaminants, while cell culture and tissue engineering use the membrane as a structured interface for cells. Drug delivery uses its transport properties to regulate movement of substances. Comparing these applications shows how the same material platform can support separation, transport, and cellular organization.