scholarly journals Growth and characterization of manganese doped and undoped calcium oxalate monohydrate crystal

2017 ◽  
Vol 08 (03) ◽  
pp. 15916-15921
Author(s):  
Selvaraju R ◽  
◽  
Sulochana S ◽  
Keyword(s):  
Calcium Oxalate ◽  
Calcium Oxalate Monohydrate

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.

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.

The Study and Exposure of Laws of Distribution Protein Substances in Uroliths

2018 ◽  
Vol 781 ◽  
pp. 211-216
Author(s):  
Olga Golovanova
Keyword(s):  
Amino Acids ◽  
Calcium Oxalate ◽  
Crystal Surface ◽  
Calcium Oxalate Monohydrate ◽  
Model Systems ◽  
Urinary Stones ◽  
Kinetic Properties ◽  
Laws Of Distribution

The characterization of urinary stones mineral and organic composition in Omsk region and Saint-Petersburg (Russia) was studied. It was established that nature and amount of amino acids and trace elements in composition of phosphate, oxalate and urate urinary stones are different. For studying processes of formation of the main mineral phase of urinary stones on the model systems powders of calcium oxalate monohydrate and hydroxyapatite with molar Ca/P ration 1.57 –1.67 were synthesized. The determination of electro kinetic properties and particle size of synthesized powders were made. The effects of amino acids (glutamic acid, glycine and lysine) on the process of formation of calcium oxalate monohydrate and hydroxyapatite were investigated. It was shown that amino acids inhibited growth and aggregation of calcium oxalate monohydrate and hydroxyapatite particles and preferential adsorb on to their crystal surface.

EDXRF , FTIR , and XRD characterization of low calcium oxalate urinary stones collected from arid area

2021 ◽  
Author(s):  
Abdallah A. Shaltout ◽  
Maram M. Dabi ◽  
Doaa A. Said ◽  
Mousa A. Allam ◽  
Sameh I. Ahmed
Keyword(s):  
Calcium Oxalate ◽  
Arid Area ◽  
Urinary Stones ◽  
Low Calcium

scholarly journals Can stone composition be predicted by plain X-ray and/or non-contrast CT? A study validated by X-ray diffraction analysis

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
Mohamed Gadelmoula ◽  
Ahmed M. Moeen ◽  
Ahmed Elderwy ◽  
Mohamed S. Abdel-Kader ◽  
Ayman Elqady ◽  
...  
Keyword(s):  
Calcium Oxalate ◽  
Diffraction Analysis ◽  
Great Influence ◽  
Calcium Oxalate Monohydrate ◽  
Categorical Variables ◽  
Stone Analysis ◽  
Stone Composition ◽  
Cutoff Value ◽  
X Ray ◽  
Contrast Ct

Abstract Background The stone composition has a great influence on the outcome of its treatment. There are several tests to predict the composition of stones preoperatively and stone analysis postoperatively. Herein, we want to evaluate if the stone composition could be predicted from plain X-ray KUB (PKUB) and/or non-contrast CT (NCCT) validated by in vitro X-ray powder diffraction analysis (XRD). Methods Between April 2014 and March 2016, 100 cases with urinary tract stones were included in the study. The radio-opacity of the stones in PKUB, stone density by NCCT, and after stone extraction, XRD were performed. Statistical analysis for the results was performed using Chi-square and Fisher exact tests for categorical variables and Mann–Whitney U and Kruskal–Wallis H for the nonparametric variables. The receiver operating characteristic curve was constructed to determine the best cutoff value. Results This study included 74 males and 26 females with a median age of 32 years (range 2–70). Regarding the radio-opacity by PKUB, there were 30 stones dense opaque, 44 opaque, 21 faint opaque, and 5 radiolucent. XRD revealed 97 mixed and 3 pure stones. The calcium oxalate monohydrate (COM) stone composition could be predicted in dense opaque stone by PKUB in 75.9% and urate composition in the radiolucent stone by 40%. The cutoff value of HU density by NCCT to the dense opaque stones in the PKUB was > 1020 and for radiolucent stones was < 590. Conclusion Stone radio-opacity by PKUB and its attenuation value by NCCT could successfully predict its calcium oxalate monohydrate, struvite, and urate composition. However, the chemical stone analysis is still required as most stones are mixed.

Sign in / Sign up

Export Citation Format

Share Document