scholarly journals Effects of Calcium Ion on the Physicochemical Properties of Particles of A Lipid A Analog, E5531 and Its Pharmacokinetics in Rats.

MEMBRANE ◽  
2003 ◽  
Vol 28 (1) ◽  
pp. 37-40
Author(s):  
Yasuyuki Asai
Keyword(s):  
Physicochemical Properties ◽  
Calcium Ion ◽  
Lipid A ◽  
Pharmacokinetics In Rats

scholarly journals Evaluation of pH, Calcium Ion Release, and Dimensional Stability of an Experimental Silver Nanoparticle-Incorporated Calcium Silicate-Based Cement

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Teena Sheethal Dsouza ◽  
Aditya Shetty ◽  
Neevan Dsouza
Keyword(s):  
Physicochemical Properties ◽  
Dimensional Stability ◽  
Calcium Ion ◽  
Calcium Silicate ◽  
Filling Material ◽  
Ion Release ◽  
Filling Materials ◽  
Sample Test ◽  
Initial Ph ◽  
Experimental Group

An experimental calcium silicate-based root-end filling material incorporated with silver nanoparticles intended for use in periapical surgeries was developed with the purpose to overcome the drawbacks of existing materials and to satisfy the ideal requirements of root-end filling materials. This study was designed to evaluate the physicochemical properties, pH, calcium ion release, and dimensional stability of the experimental cement, and compare the results with commercially available ProRoot MTA (Dentsply). An independent sample test was used to analyze the data. Mean initial pH (immediately after mixing) of the experimental cement was 10.42 ± 0.04 which was higher than that of MTA. However, there was a significant increase in pH of MTA at 1 day, 2 days, and 7 days. Presence of calcium chloride favored the release of calcium ions which was significantly increased in the experimental group at 24 hours. At the end of 30 days, MTA showed a significant expansion when compared to the experimental cement p < 0.001 . In conclusion, the experimental nanoparticle-incorporated calcium silicate-based cement showed clinically acceptable physicochemical properties.

scholarly journals Evaluation of Physicochemical Properties of New Calcium Silicate-Based Sealer

2018 ◽  
Vol 29 (6) ◽  
pp. 536-540 ◽  
Author(s):  
Aline Teixeira Mendes ◽  
Paula Barcellos da Silva ◽  
Bruna Barcelos Só ◽  
Lina Naomi Hashizume ◽  
Rodrigo Ricci Vivan ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Calcium Ion ◽  
Calcium Silicate ◽  
Calcium Release ◽  
Setting Time ◽  
Porto Alegre ◽  
Ion Release ◽  
Ph Values ◽  
Time Flow ◽  
Ah Plus

Abstract This study aimed to evaluate the physicochemical properties of a calcium silicate-based sealer (Sealer Plus BC; MK Life, Porto Alegre, Brazil) compared with an epoxy-resin sealer (AH Plus; Dentsply DeTrey GmbH, Konstanz, Germany). Initial and final setting time was assessed based on ISO 6876:2012 and ASTM C266:03. Calcium ion release and pH were evaluated by filling polyethylene tubes with sealers and then immersing them in 10 mL of deionized water. Following experimental periods of 1, 24, 72 and 168 hours, the samples were measured regarding pH and calcium ion release with a pH meter and a colorimetric spectrophotometer, respectively. The flow was examined based on ISO 6876:2012. Rings of 10 mm in diameter with 1 mm thickness were prepared to analyze the radiopacity (ISO 6876:2012 and ADA n.57) and solubility (ISO 6876:2012). The data were analyzed by variance analysis, Student-T and Tukey tests (p<0.05). The calcium ion release and pH values were significantly higher for the Sealer Plus BC compared with the AH Plus (p<0.05). Lower setting time, flow and radiopacity were observed for the bioceramic sealer than for AH Plus (p<0.05). Sealer Plus BC exhibited higher solubility compared with AH Plus (p<0.05). Sealer Plus BC showed physicochemical properties as setting time, pH, calcium release, flow, and radiopacity following the required standards, but higher solubility than the minimum values required by ISO 6876:2012.

Variation of the bone forming ability with the physicochemical properties of calcium phosphate bone substitutes

2018 ◽  
Vol 6 (1) ◽  
pp. 136-145 ◽  
Author(s):  
Rongquan Duan ◽  
Davide Barbieri ◽  
Xiaoman Luo ◽  
Jie Weng ◽  
Chongyun Bao ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Physicochemical Properties ◽  
Surface Structure ◽  
Protein Adsorption ◽  
Calcium Ion ◽  
Bone Substitutes ◽  
Ion Release ◽  
Adsorption Surface

The submicron-scaled surface structure triggers osteoinduction in CaPs via mechanotransduction, rather than protein adsorption, surface mineralization and calcium ion release.

Control of the Dispersing Process and Pharmacokinetics in Rats for Lipid A Analogue, E5531

1999 ◽  
Vol 51 (5) ◽  
pp. 577-584 ◽  
Author(s):  
YASUYUKI ASAI ◽  
YOSHIHISA SANO ◽  
KIYOMI KIKUCHI ◽  
KIYOSHI IWAMOTO ◽  
SUMIO WATANABE
Keyword(s):  
Lipid A ◽  
Pharmacokinetics In Rats

Lead aspartate: a new en bloc stain for electron microscopy

1978 ◽  
Vol 36 (2) ◽  
pp. 34-35
Author(s):  
J.R. Walton
Keyword(s):  
Electron Microscopy ◽  
Calcium Ion ◽  
Enzyme Reaction ◽  
Lead Citrate ◽  
Reaction Products ◽  
En Bloc ◽  
Thin Sections ◽  
Lead Salts ◽  
Thin Sectioning ◽  
High Alkalinity

In electron microscopy, lead is the metal most widely used for enhancing specimen contrast. Lead citrate requires a pH of 12 to stain thin sections of epoxy-embedded material rapidly and intensively. However, this high alkalinity tends to leach out enzyme reaction products, making lead citrate unsuitable for many cytochemical studies. Substitution of the chelator aspartate for citrate allows staining to be carried out at pH 6 or 7 without apparent effect on cytochemical products. Moreover, due to the low, controlled level of free lead ions, contamination-free staining can be carried out en bloc, prior to dehydration and embedding. En bloc use of lead aspartate permits the grid-staining step to be bypassed, allowing samples to be examined immediately after thin-sectioning.Procedures. To prevent precipitation of lead salts, double- or glass-distilled H20 used in the stain and rinses should be boiled to drive off carbon dioxide and glassware should be carefully rinsed to remove any persisting traces of calcium ion.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

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