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Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
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Masonry curtain walls employ brick or stone veneers supported by the building's structure to form an external cladding system that is both aesthetically appealing and functional. These walls are erected through two principal techniques, first by traditional layering of masonry units and second by using prefabricated panels. Traditional construction relies on steel shelf angles attached to the spandrel beam for support, with high-bond mortars ensuring secure attachment of masonry veneer...
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Cavity walls feature a hollow space between the outer and inner wythes, connected only by corrosion-resistant metal ties. When water seeps through the outer wythe, it descends within this cavity, intercepted by flashing and eventually exiting through weep holes. To enhance moisture resistance, the inner wythe's cavity side often receives damp-proofing, doubling as an air barrier. The cavity can also house insulation to mitigate heat transfer.
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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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Breaking down walls to live in harmony.

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  • 1Natalia Requena is in the Department of Molecular Phytopathology, Botanical Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany natalia.requena@kit.edu.

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Researchers identified key bacterial proteins and enzymes responsible for invading fungal cells and causing rice seedling blight. This discovery advances understanding of plant-pathogen interactions and disease management strategies.

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Area of Science:

  • Plant pathology
  • Microbiology
  • Molecular biology

Background:

  • Rice seedling blight is a devastating agricultural disease.
  • Understanding the molecular mechanisms of pathogen invasion is crucial for disease control.

Purpose of the Study:

  • To identify the specific proteins and enzymes utilized by bacteria to infect fungal cells.
  • To elucidate the molecular basis of rice seedling blight.

Main Methods:

  • Proteomic analysis of bacterial isolates.
  • Enzyme activity assays.
  • Fungal cell invasion assays.

Main Results:

  • Several novel bacterial proteins and enzymes essential for fungal cell entry were identified.
  • Specific enzymatic activities correlated with the ability of bacteria to penetrate fungal tissues.

Conclusions:

  • The identified proteins and enzymes are critical virulence factors in rice seedling blight.
  • Targeting these factors presents a potential strategy for developing novel disease management approaches.