scholarly journals Characterization of Calcium Oxalate Biominerals in Some (Non-Cactaceae) Succulent Plant Species

2010 ◽  
Vol 65 (7-8) ◽  
pp. 429-432 ◽  
Author(s):  
Paula V. Monje ◽  
Enrique J. Baran
Keyword(s):  
Calcium Oxalate ◽  
Plant Species ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Calcium Oxalate Monohydrate ◽  
Succulent Plant ◽  
Infrared Spectroscopic ◽  
Succulent Plants

The water-accumulating leaves of crassulacean acid metabolism plants belonging to five different families were investigated for the presence of biominerals by infrared spectroscopic and microscopic analyses. Spectroscopic results revealed that the mineral present in succulent species of Agavaceae, Aizoaceae, and Asphodelaceae was calcium oxalate monohydrate (whewellite, CaC2O4 · H2O). Crystals were predominantly found as raphides or solitary crystals of various morphologies. However, representative Crassulaceae members and a succulent species of Asteraceae did not show the presence of biominerals. Overall, these results suggest no correlation between calcium oxalate generation and crassulacean acid metabolism in succulent plants.

scholarly journals On the Formation of Weddellite in Chamaecereus silvestrii, a Cactaceae Species from Northern Argentina

1996 ◽  
Vol 51 (5-6) ◽  
pp. 426-428 ◽  
Author(s):  
P.V. Monje ◽  
E.J. Baran
Keyword(s):  
Calcium Oxalate ◽  
Plant Species ◽  
Calcium Oxalate Dihydrate ◽  
Spectroscopic Measurements ◽  
First Report ◽  
Oxalate Dihydrate ◽  
Infrared Spectroscopic

Abstract The isolation of well formed crystals of the biomineral weddellite (calcium oxalate dihydrate) from Chamaecereus silvestrii, a Cactaceae species found in the northern part of Argentina, is described. Infrared spectroscopic measurements allow an unambiguous characterization of the nature of the crystals. This is the first report of the presence of a biomineral in this plant species.

A synchrotron study of bladder urolith architecture

2000 ◽  
Vol 15 (2) ◽  
pp. 94-100
Author(s):  
K. D. Rogers ◽  
M. W. Sperrin ◽  
E. J. MacLean
Keyword(s):  
Calcium Oxalate ◽  
Calcium Oxalate Monohydrate ◽  
Rietveld Analysis ◽  
Calcium Oxalate Dihydrate ◽  
New Approach ◽  
Surface Data ◽  
Cell Dimensions ◽  
Crystalline Nature ◽  
Unit Cell Dimensions

The principal aim of this study was to assess a new approach to the characterization of uroliths using synchrotron radiation. To achieve this, a detailed investigation of the crystalline nature of a human bladder urolith has been undertaken. Changes in the phase composition and crystalline mineral nature have been measured from the urolith core center to its outer surface. Data were collected using a microbeam, synchrotron probe, and image plate. Rietveld analysis has enabled us to determine that the unit cell dimensions of the majority phases (anhydrous uric acid and calcium oxalate monohydrate) are significantly greater in the core region but become progressively smaller from the outer to inner regions. The crystallites of both phases are also shown to possess significant radial orientation which varies through the urolith and reaches a maximum at a point of principal fracture. The analysis has also allowed us to study the change in average crystallite morphology; the crystallites of both phases are shown to decrease in size toward the outer parts of the urolith although this is in a nonuniform fashion. Evidence of calcium oxalate dihydrate was also found, but only within the outermost region of the urolith.

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