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Related Concept Videos

Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

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Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Bleeding in fresh concrete occurs when water from the mix rises to the surface. This happens because the mix's solid components fail to retain all the water as they settle, leading to separation where water collects at the top. The severity of bleeding can be measured by assessing the total settlement or by noting the decrease in height per unit height of concrete.
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Related Experiment Video

Updated: Jan 23, 2026

Subcellular Fractionation from Fresh and Frozen Gastrointestinal Specimens
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Keeping it fresh.

Jonathan L Klassen1

  • 1Department of Molecular and Cell Biology, University of Connecticut, Storrs, United States.

Elife
|June 13, 2019
PubMed
Summary

Beewolf wasp eggs emit nitrogen oxides, a natural defense mechanism. This process effectively protects the eggs from harmful fungi and microbes, ensuring survival.

Area of Science:

  • Entomology
  • Chemical Ecology
  • Biochemistry

Background:

  • The beewolf wasp (Philanthus triangulum) is a solitary digger wasp.
  • Insect eggs are vulnerable to microbial infections.
  • Nitrogen oxides (NOx) are known for their antimicrobial properties.

Purpose of the Study:

  • To investigate the defensive mechanisms employed by beewolf wasp eggs.
  • To identify the chemical compounds involved in egg protection.
  • To understand the role of nitrogen oxides in beewolf wasp reproduction.

Main Methods:

  • Analysis of volatile organic compounds emitted by beewolf wasp eggs.
  • Gas chromatography-mass spectrometry (GC-MS) to identify NOx.
  • Fungal and microbial inhibition assays using emitted compounds.
Keywords:
Philanthus triangulumantimicrobial strategyecologyevolutionary biologyinsect eggmould funginitric oxidenitric oxide synthase

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Main Results:

  • Beewolf wasp eggs were found to emit significant levels of nitrogen oxides.
  • The emitted NOx demonstrated potent inhibitory effects against common fungal and bacterial species.
  • The concentration of NOx correlated with the level of protection.

Conclusions:

  • Nitrogen oxides serve as a crucial antimicrobial defense for beewolf wasp eggs.
  • This chemical defense mechanism enhances the survival rate of developing larvae.
  • The study reveals a novel application of nitrogen oxides in insect reproduction.