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see formaldehydeformaldehyde
, HCHO, the simplest aldehyde. It melts at −92°C;, boils at −21°C;, and is soluble in water, alcohol, and ether; at STP, it is a flammable, poisonous, colorless gas with a suffocating odor.
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(also paraform), a mixture of formaldehyde polymerization products, called polyoxymethylenes, of the general formula (—CH2O—)n where n is any integer from eight to 100. Paraformaldehyde is a white, crystalline substance with a melting range between 105° and 150°C. It is obtained by evaporating concentrated, aqueous solutions of formaldehyde in vacuo. Paraformaldehyde is a convenient source of formaldehyde.


(organic chemistry)
(HCHO)n Polymer of formaldehyde where n is greater than 6; white, alkali-soluble solid, insoluble in alcohol, ether, and water; used as a disinfectant, fumigant, and fungicide, and to make resins.
References in periodicals archive ?
On Day 7, porcine SCNT embryos were fixed with 4% paraformaldehyde solution for 1 h at 4[degrees]C and then rinsed three times with PBS.
Mouse brain fixed in buffered 4% paraformaldehyde was treated for 1 h at room temperature with formic acid (98%-100%) before being embedded in paraffin blocks (Thermo Electron, Cergy-Pontoise, France).
For devices possibly containing biological contaminants, such as biosafety cabinets, the principal investigator is asked to provide documentation of appropriate systemic disinfection, such as circulation of paraformaldehyde.
We didn't realize we also needed sodium azide, paraformaldehyde, and phosphate buffered saline.
After the treatment, the cells were washed with cold PBS, fixed with 4% paraformaldehyde for 10 min, and permeabilized in 0.
Non-adherent cells were washed off and remaining cells were fixed with 200[micro]l of 4% paraformaldehyde for 30 minutes.
Tenders are invited for Supply Of Propidium Iodide, Paraformaldehyde, Dna Molecular Weight Marker, Taq Dna Polymerase, etc
The blood was replaced with normal saline (37[degrees]C) and subsequently perfusion-fixed with 4% paraformaldehyde in PBS buffer (pH 7.
Paraformaldehyde (AR grade) and aniline (AR grade) were purchased from Merck Co.
Briefly, eyes were removed and immersed in ice-cold phosphate-buffered saline (PBS), corneas were slit, and eyes were immersion fixed in buffered 4% paraformaldehyde for 30 min (confocal microscopy) or Karnovsky's fixative (light microscopy).
After treatment, MEFs were fixed with ice-cold 30 g/L paraformaldehyde (Sigma-Aldrich) in PBS for 15 min at room temperature.