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Related Concept Videos

Machines01:19

Machines

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
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Machines: Problem Solving II01:30

Machines: Problem Solving II

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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Machines: Problem Solving I01:22

Machines: Problem Solving I

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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Cell-surface Signaling01:21

Cell-surface Signaling

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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
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Dynamic Equilibrium02:20

Dynamic Equilibrium

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Calcium Dynamics as a Machine for Decoding Signals.

Carlotta Giorgi1, Alberto Danese1, Sonia Missiroli1

  • 1Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy.

Trends in Cell Biology
|February 8, 2018
PubMed
Summary
This summary is machine-generated.

Calcium ions (Ca2+) are crucial for cell signaling, influencing cell growth, death, and disease. This review explores localized Ca2+ signaling in cell fate, inflammasomes, and synaptic transmission.

Keywords:
calciumcancercell cyclecell deathinflammationischemiamitochondrianeuron

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • Calcium ions (Ca2+) are vital biological cations involved in cell physiopathology and fate.
  • Ca2+ signaling regulates cell proliferation, growth, and death.
  • Disruptions in Ca2+ homeostasis are linked to diseases like cancer, heart failure, diabetes, and neurodegeneration.

Purpose of the Study:

  • To review recent discoveries in localized Ca2+-dependent signal transduction.
  • To examine the roles of Ca2+ signaling in cell fate determination.
  • To explore Ca2+ signaling in inflammasome activation and synaptic transmission.

Main Methods:

  • Literature review of recent research on calcium signaling.
  • Analysis of studies focusing on localized Ca2+ dynamics.
  • Synthesis of findings on Ca2+ roles in cellular processes and disease.

Main Results:

  • Ca2+ signaling is highly localized, impacting specific cellular events.
  • Localized Ca2+ signals are critical for regulating cell fate decisions.
  • Ca2+ plays key roles in inflammasome activation and synaptic transmission.

Conclusions:

  • Understanding localized Ca2+ signaling is essential for comprehending cell physiology and pathology.
  • Targeting Ca2+ pathways may offer therapeutic strategies for various diseases.
  • Further research into Ca2+ dynamics will illuminate fundamental biological processes.