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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Types of Non-structural Cracks in Concrete01:28

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Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
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Creep in Concrete01:22

Creep in Concrete

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Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
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Spanning Openings in Brick Walls01:20

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In brick wall construction, supporting structures are crucial for openings like windows and doors to maintain the integrity and support the weight of the wall above. These supports include lintels, corbels, and arches, each serving specific structural purposes.
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Related Experiment Video

Updated: Aug 27, 2025

Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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Seeing through the cracks.

Cecylia Witkowski1, Niku Dhillon2, Baljean Dhillon3

  • 1General medicine, Aberdeen Royal Infirmary, Aberdeen, UK.

The Journal of the Royal College of Physicians of Edinburgh
|September 23, 2022
PubMed
Summary
This summary is machine-generated.

Pseudoxanthoma elasticum (PXE) can cause severe vision loss from maculopathy. This case shows subtle skin and eye signs of PXE may be missed, delaying diagnosis and treatment.

Keywords:
angioid streakschoroidal neovascularisationpseudoxanthoma elasticum

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Area of Science:

  • Ophthalmology
  • Dermatology
  • Genetics

Background:

  • Pseudoxanthoma elasticum (PXE) is an autosomal recessive disorder with variable presentation.
  • Dermatological and ophthalmic manifestations are key features of PXE.
  • Early diagnosis is crucial for managing comorbidities.

Observation:

  • A patient presented with advanced sight loss due to maculopathy.
  • Subtle skin changes on the neck were initially overlooked.
  • Retinal imaging revealed angioid streaks and outer retinal alterations.

Findings:

  • PXE aetiology was initially unrecognized despite significant ophthalmic and dermatological signs.
  • Diagnosis was confirmed via skin biopsy and genetic testing.
  • This case underscores the subtle and often hidden nature of PXE signs.

Implications:

  • Highlights the necessity of a multisystem approach for diagnosing PXE.
  • Emphasizes the importance of recognizing subtle dermatological and ophthalmic clues.
  • Underscores the potential for delayed diagnosis and the impact on patient outcomes.