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formaldehyde

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Journal Article
Published: 01 December 1940
Geological Magazine (1940) 77 (6): 478-481.
Image
Schematic of the formose reaction. <b>Formaldehyde</b> (5) and glycolaldehyde (6) ...
in > Elements
Published: 01 August 2017
Figure 1 Schematic of the formose reaction. Formaldehyde (5) and glycolaldehyde (6) react to form sugars including ribose (1). Ribose is a minor product. Successive reactions degrade ribose into brown caramel.
Journal Article
Published: 01 August 1941
Geological Magazine (1941) 78 (4): 315-316.
...W. F. Whittard Abstract Discusses the technique and the conditions for giving the best results. Concludes that rubber latex is best for making impressions from casts in sandstone while phenol formaldehyde plastic is better for soft argillaceous sediments. Latex does not penetrate the rock so much...
Journal Article
Published: 01 January 1998
Journal of Sedimentary Research (1998) 68 (1): 214-217.
... of these materials, including incomplete impregnation of sediments with organic matter or an unreasonably lengthy process. The new method is based on fixation of the organic matter with formaldehyde, and chemical dehydration with ethanol. The specimens are then impregnated with conventional epoxy or polyester waxes...
Journal Article
Published: 01 September 1971
Journal of Sedimentary Research (1971) 41 (3): 843-853.
... from the intertidal to 780 meters. Forty-two of these samples were fixed in buffered formaldehyde to preserve endolithic organisms which were subsequently isolated for study through decalcification of skeletal substrates. Plastic impregnated thin sections and etched slabs, the latter revealing three...
Image
Epimeric forms of ribose. In solution, ribose molecules have five different...
in > Elements
Published: 01 August 2017
of formaldehyde/glycolaldehyde solution containing Ca(OH) 2 (at pH 12) at 60 °C for 1 hour. The left bottle contains sodium borate (80 mM borate), which stabilize the sugars that form as a result of the formose reaction. Conversely, the right bottle does not contain any borate. In the borate-free solution
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Rose Bengal coloration patterns obtained by different preservation and stai...
Published: 01 July 2013
% formaldehyde in seawater and buffered with hexamethylentetramine ( Hemleben et al. , 1989 ), stained with an aqueous solution of 1% rose Bengal after sample processing ( Bernhard et al. , 2006 ). Right column, figs 31–46. Preservation with ethanol, stained with a 1% aqueous rose Bengal solution after washing
Journal Article
Published: 01 October 2017
Geochemical Perspectives (2017) 6 (2): 215-228.
... took to indicate that we were fairly close to a major stream at the glacier bed ( Hubbard et al. , 1995 ). Text Box 5.1 – Heathrow airport and illegally shipping formaldehyde by plane (please don’t try to do this; I’ve never done anything like this since) John Parkes suggested that we...
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Journal Article
Journal: Elements
Published: 01 August 2017
Elements (2017) 13 (4): 261-265.
...Figure 1 Schematic of the formose reaction. Formaldehyde (5) and glycolaldehyde (6) react to form sugars including ribose (1). Ribose is a minor product. Successive reactions degrade ribose into brown caramel. ...
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Journal Article
Published: 01 July 2012
Journal of Foraminiferal Research (2012) 42 (3): 206-215.
... compared with samples stained with rB from cores WKW1 RB and WKW5 RB ( Table 1 ). Because no live foraminifera were found deeper than 13 cm, only four intervals were studied at this location. In core WKW1 CT, 3.8%, buffered formaldehyde was used as a preservative, and 4% paraformaldehyde PFA in WKW5 CT...
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Journal Article
Journal: Elements
Published: 01 December 2016
Elements (2016) 12 (6): 401-406.
... ], a molecule that is highly reactive and that can subsequently be reacted to yield most of the precursor compounds required for biologically important molecules, such as amino acids, glycinamides, and even adenine and imidazole. The addition of formaldehyde (CH 2 O) to the system yields monosaccharides. Using...
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Journal Article
Published: 01 February 2005
Clays and Clay Minerals (2005) 53 (1): 11-17.
...− -hydrotalcite-like compound from the acid waste streams of the anodizing industry. This anionic clay is useful for catalytic and electroanalytical purposes and as a polymer stabilizer. Such a compound can catalyze the cross-aldol condensation reaction between formaldehyde and acetone when calcined at 773 K...
FIGURES
Journal Article
Published: 01 November 2015
Mineralogical Magazine (2015) 79 (6): 1275-1286.
... ), Noshita ( 2008 ) and recently by Takahashi et al. ( 2014 ). Kaneko et al. ( 2003 ) identified formic (HCOOH) and acetic acids (CH 3 COOH), formaldehyde (HCHO), methanol (CH 3 OH) and ethanol (C 2 H 5 OH) as the main chemical forms in leach solutions in contact with non-irradiated carbides (ZrC, Fe 3 C...
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Journal Article
Published: 01 September 2014
Journal of Micropalaeontology (2014) 33 (2): 143-148.
... fluorescent light emitted from the pseudopodia was caused by strongly acidic low pH conditions in the pseudopodia. However, it is unlikely that green fluorescence is due solely to a low pH within the cytoplasm of the pseudopodia. After formalin (formaldehyde) fixation, the entire cell comes to equilibrium...
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Journal Article
Published: 01 February 2015
American Mineralogist (2015) 100 (2-3): 483-494.
... a biomass concentration of 2 mg/mL and bound EPS was extracted from this biomass solution following a previously established procedure using formaldehyde with NaOH developed for anaerobic sludges ( Liu and Fang 2002 ). After dialysis, we can usually collect ~90 mL bound EPS solution out of ~3 L...
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Journal Article
Published: 01 January 2005
Reviews in Mineralogy and Geochemistry (2005) 59 (1): 187-210.
... and 30 times faster than the adduct with glucose. It crystallizes from water under conditions where none of the other adducts crystallize and this adduct is much more stable than free ribose. The only problem is that cyanamide reacts with formaldehyde, glycolaldehyde and glyceraldehydes, compounds...
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Journal Article
Published: 01 February 2012
Journal of Micropalaeontology (2012) 31 (1): 53-72.
.... The identification was first made through the natural colour of the protoplasm. Later, the tests of formaldehyde-fixed specimens were dissolved and biological stains were applied to the protoplasmic casts. The sensitivity of living foraminifera to biological stains has been known since Rhumbler (1935) , who...
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Journal Article
Published: 01 February 2008
Mineralogical Magazine (2008) 72 (1): 191-195.
.... The worms then were euthanized and frozen until analysis by inductively coupled plasma mass spectrometry (ICP-MS). The worms from the fourth replicate at each dose level were removed, rinsed, weighed, euthanized and preserved in a formaldehyde solution for trace element mapping using beam line X26A...
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Journal Article
Published: 01 January 2008
Reviews in Mineralogy and Geochemistry (2008) 68 (1): 247-272.
... )., Hydrogen-atom addition to CO proceeds through the highly-reactive formyl radical (HCO). This subsequently converts to formaldehyde polymers such as polyoxymethylene (POM) and related derivatives ( Huebner et al. 1987 ; Meier et al. 1993 ; Schutte et al. 1993 ), and also to H 2 CO and then to CH 3 OH...
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Journal Article
Published: 01 July 2013
Journal of Micropalaeontology (2013) 32 (2): 161-182.
...% formaldehyde in seawater and buffered with hexamethylentetramine ( Hemleben et al. , 1989 ), stained with an aqueous solution of 1% rose Bengal after sample processing ( Bernhard et al. , 2006 ). Right column, figs 31–46. Preservation with ethanol, stained with a 1% aqueous rose Bengal solution after washing...
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