Synthesis of Zinc Oxalate Coordination Polymers via Unprecedented Oxidative Coupling of Methanol to Oxalic Acid

2001 ◽  
Vol 1 (1) ◽  
pp. 9-11 ◽  
Author(s):  
Owen R. Evans ◽  
Wenbin Lin
Keyword(s):  
Oxalic Acid ◽  
Coordination Polymers ◽  
Oxidative Coupling ◽  
Zinc Oxalate

1-D to 3-D lanthanide coordination polymers constructed from 5-aminoisophthalic acid and oxalic acid

2012 ◽  
Vol 23 ◽  
pp. 25-30 ◽  
Author(s):  
Hong-Guang Jin ◽  
Yuan-Zhao Yan ◽  
Jing Li ◽  
Zhi-Gang Gu ◽  
Jin-Hao Chen ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Coordination Polymers ◽  
Lanthanide Coordination Polymers

Spectrophotometric determination of urinary oxalate with oxalate oxidase prepared from moss.

1980 ◽  
Vol 26 (7) ◽  
pp. 827-830 ◽  
Author(s):  
M F Laker ◽  
A F Hofmann ◽  
B J Meeuse
Keyword(s):  
Hydrogen Peroxide ◽  
Oxalic Acid ◽  
Oxidative Coupling ◽  
Oxalate Oxidase ◽  
Ion Exchange Resins ◽  
Urinary Oxalate ◽  
Moss Species ◽  
Chemical Technique ◽  
Exchange Resins

Abstract A novel spectrophotometric enzymic procedure for estimating oxalic acid in urine is described. Oxalate oxidase, prepared from moss species, converts oxalic acid to hydrogen peroxide and carbon dioxide. Hydrogen peroxide is determined enzymatically with horseradish peroxidase, by oxidative coupling of 3-methyl-2-benzothiazolinone hydrazone with N,N-dimethylaniline; the resulting indamine due is determined spectrophotometrically at 595 nm. Interfering substances are removed by adsorption to ion-exchange resins and oxidation with charcoal, thus avoiding oxalate recovery problems accompanying oxalate isolation. The procedure is rapid, sensitive, linear, and precise. Results agreed well with those obtained with a widely used chemical technique.

Spectrophotometric determination of urinary oxalate with oxalate oxidase prepared from moss.

1980 ◽  
Vol 26 (7) ◽  
pp. 827-830 ◽  
Author(s):  
M F Laker ◽  
A F Hofmann ◽  
B J Meeuse
Keyword(s):  
Hydrogen Peroxide ◽  
Oxalic Acid ◽  
Oxidative Coupling ◽  
Oxalate Oxidase ◽  
Ion Exchange Resins ◽  
Urinary Oxalate ◽  
Moss Species ◽  
Chemical Technique ◽  
Exchange Resins

Abstract A novel spectrophotometric enzymic procedure for estimating oxalic acid in urine is described. Oxalate oxidase, prepared from moss species, converts oxalic acid to hydrogen peroxide and carbon dioxide. Hydrogen peroxide is determined enzymatically with horseradish peroxidase, by oxidative coupling of 3-methyl-2-benzothiazolinone hydrazone with N,N-dimethylaniline; the resulting indamine due is determined spectrophotometrically at 595 nm. Interfering substances are removed by adsorption to ion-exchange resins and oxidation with charcoal, thus avoiding oxalate recovery problems accompanying oxalate isolation. The procedure is rapid, sensitive, linear, and precise. Results agreed well with those obtained with a widely used chemical technique.

Ectodesmata as Revealed By Freeze-Etch Preparations of Plant Epidermal Cell Walls

1973 ◽  
Vol 31 ◽  
pp. 468-469
Author(s):  
N.C. Lyon ◽  
W. C. Mueller
Keyword(s):  
Electron Microscopy ◽  
Acetic Acid ◽  
Nitric Acid ◽  
Oxalic Acid ◽  
Light Microscopy ◽  
Epidermal Cell ◽  
Cell Walls ◽  
Plant Viruses ◽  
Plant Leaves ◽  
Thin Sections

Schumacher and Halbsguth first demonstrated ectodesmata as pores or channels in the epidermal cell walls in haustoria of Cuscuta odorata L. by light microscopy in tissues fixed in a sublimate fixative (30% ethyl alcohol, 30 ml:glacial acetic acid, 10 ml: 65% nitric acid, 1 ml: 40% formaldehyde, 5 ml: oxalic acid, 2 g: mecuric chloride to saturation 2-3 g). Other workers have published electron micrographs of structures transversing the outer epidermal cell in thin sections of plant leaves that have been interpreted as ectodesmata. Such structures are evident following treatment with Hg++ or Ag+ salts and are only rarely observed by electron microscopy. If ectodesmata exist without such treatment, and are not artefacts, they would afford natural pathways of entry for applied foliar solutions and plant viruses.

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