phosphotungstic acid


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phosphotungstic acid

[¦fä·sfō′təŋ·stik ′as·əd]
(inorganic chemistry)
H3PO4·12WO3· x H2O Heavy-greenish, water- and alcohol-soluble crystals; used as an analytical reagent and in the manufacture of organic pigments. Also known as heavy acid; phosphowolframic acid; PTA.
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b) AR H2N (c) GCDFP-15 (d) PTAH (e) chondrial (e) 1 Neg Pos Pos 2 3 Neg fPos Pos 4 5 Neg Pos Pos 5 5 Neg Pos Pos 6 5 Pos Pos Pos Neg fPos 7 0 Pos Pos Pos Neg fPos 8 5 Pos Pos Pos Neg fPos 9 5 Pos Neg Pos Neg fPos 10 30 Pos Pos Pos fPos fPos Abbreviations: ApEMCa, apocrine epithelial myoepithelial carcinoma; AR, androgen receptor; Epi, epithelial (luminal) component; fPos, focally positive; GCDFP-15, gross cystic disease fluid protein-15; H2N, HER2/neu; myo, myoepithelial (abluminal) component; Neg, negative; OEMCa, oncocytic epithelial myoepithelial carcinoma; Pos, positive; PTAH, phosphotungstic acid hematoxylin.
A recent paper describes the preparation of phosphotungstic acid (HPA)/sulfonated poly(arylene ether sulfone) composite membranes with different disulfonation levels of the polymer matrix via solution blending (J.
Using the sodium phosphotungstic acid precipitation method, we concentrated (100-fold) individual 1-mL saliva samples from each time point.
The uric acid level was determined by the phosphotungstic acid method, as described elsewhere (Carroll et al.
22) They also stain with Giemsa (figure 2) and Mallory's phosphotungstic acid stain.
They were then immersed in a solution of 5% phosphotungstic acid in ethanol for two hours and finally washed with pure ethanol, dried and coated with carbon.
In addition to electron microscopic evidence of mitochondrial proliferation was helpful in diagnosis; in addition to that, Phosphotungstic Acid Hematoxylin staining was often useful in identifying oncocytes.
Samples from these cattle had been confirmed as negative by paraffin-embedded tissue blot (University of Gottingen, Gottingen Germany), sodium phosphotungstic acid precipitation, followed by WB (European Union Reference Laboratory for Transmissible Spongiform Encephalopathies, Veterinary Laboratories Agency, New Haw, UK), Prionics WB (Prionics AG, Zurich, Switzerland), histopathologic examination, and immunohistochemical testing (Veterinary Laboratories Agency).
Neoplastic cells had no cross-striations in sections stained by phosphotungstic acid hematoxylin.
Focal neuron-specific enolase (NSE) and chromogranin expression was restricted to the SCC, whereas phosphotungstic acid and Luxol fast blue, which stain mitochondria, were positive in the OSP.
The surface morphology of the investigated blends were also visualized by staining the surface with phosphotungstic acid with TEM.
Summary: In this study, we report the one-pot synthesis of 2-amino-3,5-dicarbonitrile-6-thio- pyridines with benzaldehyde, malononitrile, and thiophenol by using phosphotungstic acid as an efficient catalyst in aqueous media.

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