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Efflorescence in Masonry

Efflorescence in Masonry

Efflorescence in masonry walls appears as a fluffy crystalline powder, often white, resulting from water-soluble salts within the masonry or mortar. When water penetrates the masonry, it dissolves these salts and brings them to the surface, where they are deposited upon evaporation of water.
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Washing, Drying, and Ignition of Precipitates

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.

Masonry in Cold and Hot Weather Conditions

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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
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Cold Weather Concreting

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When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
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Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...

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Updated: Jun 12, 2026

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

Published on: January 6, 2023

Fresh powder on Waddington's slopes.

Amanda G Fisher¹, Matthias Merkenschlager

¹MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital Campus, London, UK. amanda.fisher@csc.mrc.ac.uk

|June 19, 2010

Summary

This summary is machine-generated.

Scientists explored stem cell differentiation and dedifferentiation, focusing on induced pluripotent stem cells. They discussed the potential and limitations of these cells for future therapeutic applications.

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Area of Science:

Stem cell biology
Regenerative medicine
Biotechnology

Background:

Stem cell research is rapidly advancing.
Induced pluripotent stem cells (iPSCs) offer potential for regenerative medicine.
Understanding stem cell differentiation and dedifferentiation is crucial for therapeutic development.

Purpose of the Study:

To review current advances in stem cell biology.
To focus on induced pluripotent stem cells (iPSCs).
To discuss the therapeutic potential and limitations of iPSCs.

Main Methods:

Symposium attendance by diverse experts.
Presentations and discussions on stem cell research.
Focus on induced pluripotent stem cells (iPSCs).

Main Results:

Nearly 500 participants attended.
Key advances in stem cell differentiation and dedifferentiation were examined.
Potential and limitations of iPSCs in therapy were discussed.

Conclusions:

Stem cell biology is a dynamic field.
Induced pluripotent stem cells (iPSCs) hold significant therapeutic promise.
Further research is needed to overcome limitations for clinical application.