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pyrophosphates

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Journal Article
Published: 01 August 1973
American Mineralogist (1973) 58 (7-8): 756–764.
... of the three O-P-O angles common to each bond, and of (P-O(br)) vs P-O-P angle, confirm this for selected ortho- and pyrophosphates. Bond overlap populations, n [P-O], calculated with all P-O bond lengths clamped at 1.50 Å, tend to be larger for shorter observed P-O bond lengths. The P-O bond lengths...
Image
Structures of RNA nucleosides, monomers, oligomers, and <b>pyrophosphates</b>.
in > Elements
Published: 01 June 2005
FIGURE 3 Structures of RNA nucleosides, monomers, oligomers, and pyrophosphates.
Journal Article
Published: 01 August 2008
Clays and Clay Minerals (2008) 56 (4): 397–403.
...Haojie Cui; Xiangwen Liu; Wenfeng Tan; Xionghan Feng; Fan Liu; Huada Daniel Ruan Abstract Todorokite is a common Mn oxide mineral in terrestrial and ocean-floor environments, and it is commonly synthesized from layered Na-buserite. Pyrophosphate, which is known to form strong complexes with Mn(III...
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Journal Article
Published: 01 December 2009
Clays and Clay Minerals (2009) 57 (6): 715–724.
... decreased as the AOS values of (Na,K)-birnessites and Na-birnessites increased from 3.51 to 3.80. No todorokite was present when a Na-birnessite with an AOS value of 3.87 was used as the precursor. Pyrophosphate, which is known to form strong complexes with Mn 3+ at a pH range of 1–8, was added...
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Series: Society of Exploration Geophysicists Geophysical Monograph Series, Society of Exploration Geophysicists Geophysical Monograph Series
Published: 01 January 2003
DOI: 10.5382/Mono.11.34
EISBN: 9781629490069
...-dried and sieved to <80 mesh (177 mm); they were randomized prior to analysis. Humus: Details of the pyrophosphate leach method, which dissolves elements bound in various forms of the fulvic component of the humus material, have been published previously ( Hall et al., 1996a ). Briefly, 1 g...
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Journal Article
Published: 01 December 1996
American Mineralogist (1996) 81 (11-12): 1531–1534.
...), orthophosphate (PO 4 3 − ) complexes appear to be the dominant phosphate species present. As temperature increases above ~1000 K, the orthophosphate complex is partially replaced by pyrophosphate complexes (P 2 O 7 4 − ) so that at ~1200 K >70% of the P exists in the latter form. The proportion...
Series: Proceedings of the International Clay Conference, Proceedings of the International Clay Conference
Published: 01 January 1985
DOI: 10.1346/CMS-ICC-1.1
EISBN: 9781881208396
... at concentrations > 100–300 mg/liter significantly perturbed this interaction and thus inhibited the formation of allophane. The Na-pyrophosphate- and Na 2 CO 3 -soluble fractions of the precipitates (>0.01 μm), formed in the presence of the humic substances at a concentration of 300 mg/liter, were...
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<b>Pyrophosphate</b>-extracted elements from Terrace 2 mottle separates: (A) extra...
Published: 01 February 2016
Fig. 7. Pyrophosphate-extracted elements from Terrace 2 mottle separates: (A) extractable C and Al; (B) extractable C and Fe.
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Solution Mn 3+ -<b>pyrophosphate</b> complex concentrations after three (Na,K)-bir...
Published: 01 December 2009
Figure 8. Solution Mn 3+ -pyrophosphate complex concentrations after three (Na,K)-birnessites with different AOS values were treated with pH 70.01 M and 0.02 M pyrophosphate.
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Relationship between soil carbon, clay and <b>pyrophosphate</b>-extractable Al in ...
Published: 01 March 2009
F ig . 3. Relationship between soil carbon, clay and pyrophosphate-extractable Al in New Zealand soils (0–20 cm) under pasture (after Percival et al ., 2000 ).
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Formation of Mn(III)-<b>pyrophosphate</b> complex in different concentrations of p...
Published: 01 August 2008
Figure 6. Formation of Mn(III)-pyrophosphate complex in different concentrations of pyrophosphate at pH 7.
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Amount of Mn(III)-<b>pyrophosphate</b>  vs.  treatment time of Na-buserite treated...
Published: 01 August 2008
Figure 7. Amount of Mn(III)-pyrophosphate vs. treatment time of Na-buserite treated with 0.05 M pyrophosphate solution at pH 7 and pH 10.
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(A) Zn concentrations (ppb) extracted using a Na <b>pyrophosphate</b> leach and (B...
Published: 01 May 2008
Fig. 9 (A) Zn concentrations (ppb) extracted using a Na pyrophosphate leach and (B) corresponding threshold-probability diagram. See Figure 4 caption for details.
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XRD patterns of the clay fraction from site 9 after <b>pyrophosphate</b> and oxala...
Published: 01 December 2006
Figure 9. XRD patterns of the clay fraction from site 9 after pyrophosphate and oxalate extractions indicating the presence of both chlorite and kaolinite; 9a shows distinguishable peaks at 3.57 Å for kaolinite and 3.54 Å for chlorite. 9b shows the expansion of the kaolinite 001 peak to 7.6
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Deoxyadenosine <b>pyrophosphate</b> (dA 5′  pp 5′  dA).
Published: 01 January 2005
Figure 12. Deoxyadenosine pyrophosphate (dA 5′ pp 5′ dA).
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Relation between Fe and Al extracted with <b>pyrophosphate</b> (Fe p  and Al p ) a...
Published: 26 January 2004
Fig. 4. Relation between Fe and Al extracted with pyrophosphate (Fe p and Al p ) and organic carbon content at about 25–40 cm depth in Torngat soils from all altitudinal zones. The open squares correspond to the Fe p concentrations, and the solid triangles the Al p concentrations.
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Relationships between the carbon positions in isopentenyl <b>pyrophosphate</b> and...
Published: 01 January 2001
Figure 29. Relationships between the carbon positions in isopentenyl pyrophosphate and their sources. In the mevalonic-acid pathway, all five carbon positions in isopentenyl pyrophosphate derive from acetate and, in turn from the C-1 + C-6 and C-2 + C5 positions of glucose
Journal Article
Published: 01 August 2007
Clays and Clay Minerals (2007) 55 (4): 369–379.
... is in accord with the X-ray diffraction and Fourier transform infrared (FTIR) data. The impact of tannic acid on the nature of the Al precipitates is also reflected in the increase of the contents of the pyrophosphate-extractable Al, which is indicative of organically bound Al. This observation is in agreement...
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Journal Article
Published: 01 February 2003
The Canadian Mineralogist (2003) 41 (1): 221–232.
... grande échelle par le département des sciences minérales du Smithsonian Institution. Ces matériaux s’avèrent contaminés de façon importante par le plomb. Cette impureté provient de l’utilisation de Pb 2 P 2 O 7 comme fondant, dérivé de la décomposition thermique de PbHPO 4 . Le pyrophosphate...
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Journal Article
Published: 01 June 1997
Journal of the Geological Society (1997) 154 (3): 377–402.
... of the bubbles. Condensation of the organic molecules to polymers, particularly organic sulphides, was driven by pyrophosphate hydrolysis. Regeneration of pyrophosphate from the monophosphate in the membrane was facilitated by protons contributed from the Hadean ocean. This was the first use by a metabolizing...