Loop Bulge Propagation
Loop Bulge Propagation - Related Videos
01:06
Multipotency and Niche of Bulge Stem Cell
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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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01:07
Propagation of Waves
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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free. Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
01:23
Propagation of Action Potentials
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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron. Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
09:48
Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array
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Cited by 2 •
2015
We have developed an in vitro unfolded hippocampus which preserves CA1-CA3 array of neurons. Combined with the penetrating micro-electrode array, neural activity can be monitored in both the longitudinal and transverse orientations. This method provides advantages over hippocampal slice preparations as the propagation in the entire hippocampus can be recorded simultaneously.
FAQs
Propagation depends on a coordinated structural sequence: neighboring base pairs open briefly, the unpaired region shifts along the strand, and new base pairs form behind it. This repeated exchange allows the loop to relocate without requiring complete disruption of the duplex. The process therefore reflects a balance between local opening, movement of the unpaired region, and reassociation.
Sequence context can produce sequence-dependent molecular behavior because neighboring base pairs do not necessarily respond identically during transient opening and reformation. Differences in local pairing can influence where structural changes are accommodated and how the duplex reshapes. Considering sequence context helps researchers avoid treating loop movement as a uniform process across all nucleic-acid structures.
As the unpaired region shifts, the positions of paired and unpaired nucleotides change, which can alter the duplex's molecular shape. Because base pairs open and reform during this rearrangement, the local stability of the structure may also change. These effects are important when interpreting why related nucleic-acid sequences can adopt different secondary-structure behaviors.
Researchers should track the location of the unpaired region, the neighboring base pairs that must open, and the new pairings formed behind the moving loop. They can then relate those structural changes to altered shape, stability, or secondary structure. This approach supports more accurate models of sequence-dependent nucleic-acid behavior rather than relying on a single fixed conformation.
During RNA folding, movement of an unpaired region can contribute to changes in secondary structure by redistributing which nucleotides remain paired. Accounting for this dynamic behavior helps explain how RNA structures may rearrange rather than remain static. It also gives researchers a framework for connecting local loop movement with broader changes in RNA molecular shape and structural interpretation.
Hybridization studies can be affected when an unpaired region shifts and neighboring base pairs repeatedly open and reform. Such rearrangements may change the observed structure and stability of the hybridized nucleic acids. Considering loop movement is therefore relevant when researchers interpret hybridization behavior, examine mismatch recognition, or evaluate how sequence-dependent structural changes influence molecular interactions.