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Related Concept Videos

The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
Determining the Plane of Cell Division02:13

Determining the Plane of Cell Division

Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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In animal cells, the cleavage furrow forms along the plane of cell division starting...
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Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...

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Related Experiment Video

Updated: May 11, 2026

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

How Prometheus creates structure in Saturn's F ring.

Carl D Murray1, Carlos Chavez, Kevin Beurle

  • 1Astronomy Unit, Queen Mary, University of London, Mile End Road, London E1 4NS, UK. C.D.Murray@qmul.ac.uk

Nature
|October 28, 2005
PubMed
Summary
This summary is machine-generated.

Saturn's F ring shows unique features caused by its moon Prometheus. Gravitational interactions explain the formation of channels and streamers in the F ring, with changes occurring every 14.7 hours.

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Area of Science:

  • Planetary Science
  • Astrophysics
  • Orbital Dynamics

Background:

  • Cassini spacecraft images revealed previously undetected phenomena in Saturn's F ring.
  • These features include channels and 'streamers' linking the F ring to its inner shepherding satellite, Prometheus.
  • The precise mechanism for the formation of these structures remained unexplained.

Purpose of the Study:

  • To explain the formation mechanism of channels and streamers in Saturn's F ring.
  • To understand the role of gravitational interactions between Prometheus and the F ring.
  • To validate numerical models against Cassini observations.

Main Methods:

  • Developed numerical models simulating gravitational interactions.
  • Analyzed the periodic approach and recession of Prometheus relative to the F ring.
  • Compared model predictions with detailed images from the Cassini spacecraft.

Main Results:

  • The study demonstrates that gravitational interactions between Prometheus and the F ring can explain observed features.
  • As Prometheus recedes, it draws out ring material, forming streamers.
  • After one orbital period, Keplerian shear transforms these into visible channels, matching Cassini images.

Conclusions:

  • Prometheus' periodic gravitational influence is the primary driver for F ring features.
  • The observed phenomena are a direct result of gravitational interactions and Keplerian shear.
  • The intensity of these disruptions will increase as Prometheus and the F ring approach minimum orbital separation in 2009.