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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Experience-dependent structural plasticity in the cortex.

Min Fu1, Yi Zuo

  • 1Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA 95064, USA.

Trends in Neurosciences
|March 15, 2011
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Summary
This summary is machine-generated.

Brain imaging reveals that structural changes at synapses, the connections between neurons, rapidly occur during learning. These synaptic modifications are crucial for forming lasting memories, highlighting circuit plasticity

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Cognitive Science

Background:

  • Synapses are fundamental to neuronal circuits, enabling information transfer.
  • Synaptic plasticity, involving changes in synaptic strength or structure, underlies learning and memory.
  • Visualizing the living brain is essential for understanding dynamic neural processes.

Purpose of the Study:

  • To investigate the dynamic structural changes of synapses during learning.
  • To explore the relationship between synaptic remodeling and memory formation.
  • To understand experience-dependent plasticity in different cortical areas and neuronal types.

Main Methods:

  • Utilizing two-photon microscopy with fluorescence labeling for high-resolution imaging of synapses in vivo.
  • Employing time-lapse imaging to track structural reorganization of individual synapses over time.
  • Correlating observed synaptic structural changes with sensorimotor learning tasks.

Main Results:

  • Synaptic structures undergo rapid formation and elimination in specific cortical neurons during sensorimotor learning.
  • Experience-dependent synaptic plasticity varies across cortical regions, layers, and neuronal subtypes.
  • Stabilized synaptic structures are associated with the consolidation of long-lasting memories.

Conclusions:

  • Structural remodeling of neuronal circuits, specifically at synapses, is a key mechanism for learning and memory.
  • Dynamic changes in synaptic architecture provide a physical basis for memory encoding and retrieval.
  • Two-photon microscopy is a powerful tool for studying the real-time dynamics of synaptic plasticity in the brain.