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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
Ultrasonography01:17

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called a...
Radical Formation: Elimination00:51

Radical Formation: Elimination

Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions with respect to...
Radicals01:27

Radicals

Roots, often written as radicals, identify the quantity that must be raised to a specific exponent to produce a given value. A radical expression consists of two main components: the radicand, which is the value placed inside the root symbol, and the index, which indicates the degree of the root being taken. The notation n√a indicates the principal nth root of a. If n equals 2, the operation is the square root, while n = 3 defines the cube root. When n is even, a negative radicand does not...
Impact01:30

Impact

Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...

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Related Experiment Video

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A Novel Application of Musculoskeletal Ultrasound Imaging
10:53

A Novel Application of Musculoskeletal Ultrasound Imaging

Published on: September 17, 2013

The incredible ULKs.

Sebastian Alers1, Antje S Löffler, Sebastian Wesselborg

  • 1Department of Internal Medicine I, University Hospital of Tübingen, Otfried-M&#252ller-Str, 10, 72076 Tübingen, Germany. sebastian.alers@uni-tuebingen.de.

Cell Communication and Signaling : CCS
|March 15, 2012
PubMed
Summary
This summary is machine-generated.

Macroautophagy, a cellular recycling process, uses the Ulk1/2-Atg13-FIP200 complex for initiation. This review details its function, evolution, and regulation by phosphorylation during stress responses.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Macroautophagy (autophagy) is a conserved cellular process for degrading intracellular components via lysosomes.
  • It involves forming autophagosomes to enclose cargo, aiding in organelle turnover and nutrient recycling.
  • Autophagy is crucial for cellular adaptation to stress, like nutrient deprivation.

Purpose of the Study:

  • To review the vertebrate Ulk1/2-Atg13-FIP200 complex in autophagy initiation.
  • To explore its evolutionary origins from yeast complexes.
  • To summarize upstream signaling and phosphorylation events regulating this complex.

Main Methods:

  • Literature review focusing on autophagy research.
  • Analysis of conserved protein complexes across species (yeast, nematodes, vertebrates).
  • Examination of signaling pathways and phosphorylation dynamics.

Main Results:

  • The Ulk1/2-Atg13-FIP200 complex is central to autophagy initiation in vertebrates.
  • This complex evolved from the yeast Atg1-Atg13-Atg17 complex.
  • Components of the complex have additional non-autophagic neuronal functions.
  • Phosphorylation of the complex is a key mechanism for nutrient- and stress-dependent regulation.

Conclusions:

  • The Ulk1/2-Atg13-FIP200 complex is a critical regulator of autophagy initiation and cellular stress responses.
  • Understanding its regulation provides insights into cellular homeostasis and adaptation.
  • Further research into non-autophagic roles and precise phosphorylation events is warranted.