Polar Tubule
Polar Tubule - Related Videos
07:06
Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule
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Cited by 3 •
2025
We present an optimized protocol for processing whole human kidneys to isolate and culture primary renal proximal tubule epithelial cells and the application of these cells in a three-dimensional, microfluidic, microphysiological platform to recapitulate the renal proximal tubule.
04:25
Isolation of Immune Regulatory Sertoli Cells from Mouse Seminiferous Tubules
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2025
This video demonstrates the isolation procedure of Sertoli cells from mouse seminiferous tubules, a component of the testes. Enzymatic digestion and repeated washes promote the release of Sertoli cells into the solution, which can be cultured further for proliferation and growth.
05:11
Malpighian Tubule Dissection from an Adult Fly: Isolating an Osmoregulatory and Excretory Organ
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2023
This article describes the dissection of the anterior Malpighian tubules (MT) from a female Drosophila fly and an example protocol from Rossano et al. (2017) in which the MTs are prepared for live imaging in a perfusion chamber.
01:01
Group Polarization
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2020
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition. The phenomenon of group polarization explains many actions taken by groups that would not...
03:37
Molecular Shape and Polarity
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2020
Dipole Moment of a Molecule Polar covalent bonds connect two atoms with differing electronegativities, leaving one atom with a partial positive charge (δ+) and the other atom with a partial negative charge (δ–), as the electrons are pulled toward the more electronegative atom. This separation of charge gives rise to a bond dipole moment. The magnitude of a bond dipole moment is represented by the Greek letter mu (µ) and is given by the formula shown here, where Q is the magnitude of the...
FAQs
Environmental conditions associated with germination initiate a rapid structural change in the spore. The polar filament everts, meaning it turns outward, and becomes the extended tubule used during infection. This timing links germination directly to host-cell delivery, making the transition an important event for understanding how microsporidian spores become infectious.
The hollow tubule functions as a specialized conduit rather than merely a surface attachment structure. After reaching the host-cell membrane, it enables the sporoplasm, the infectious contents of the spore, to pass into the host cell. This focused transfer mechanism helps explain the efficiency of microsporidian infection and its central role in parasite biology.
Attachment or penetration brings the delivery structure into direct contact with the host-cell boundary. That interaction determines how the sporoplasm gains access to the cell and connects a physical membrane event with infection and pathogenesis. Comparing these host-cell interactions can therefore clarify how microsporidians initiate intracellular infection.
Formation is an organized, directional process rather than an undirected discharge. Germination first drives filament eversion, producing a hollow structure that reaches or engages the host-cell membrane before sporoplasm transfer occurs. This arrangement concentrates delivery at a defined site and distinguishes polar-tubule-mediated infection from passive leakage of cellular material.
Observing formation and extrusion can connect environmental triggering with the physical steps of infection. Researchers can examine when the filament everts, how the tubule develops, and how it interacts with a host cell. These observations help characterize parasite biology, identify stages associated with successful delivery, and clarify mechanisms contributing to transmission.
Because the structure mediates transfer of infectious contents into host cells, its behavior provides a direct window into microsporidian pathogenesis. Studying its formation, extrusion, and host-cell interaction may support diagnostic strategies and reveal stages or structures suitable for controlling infection. The work also links cellular mechanisms with broader patterns of parasite transmission.