Biomedical subjects

Dongsheng Wang

Publications and source records attributed to Dongsheng Wang.

22 records · Page 2Linked to original sources

PubMed2003

[Speciation and characterization of interaction of PACls with sulfate].

The interaction of sulfate with various PACl was investigated by using Ferron assay, chemical analysis and SEM. The experimental results showed that the basicity (B = [OH]/[Al]) exhibited significant role in the PACl-sulfate reaction. It indicated different species in various PACl under different reaction pathway with sulfate. The Alc formed precipitation quickly with sulfate, while Alb underwent slowly crystalization. The decrease of Ala resulted in the limit of ferron method. The different speciation component in PACls formed different crystal morphology and chemical composition with sulfate. Increase the basicity, the content of sulfate in precipitate decreased from 0.45 to 0.30.

Aluminum Hydroxide↗

PubMed2002

Relative importance of charge neutralization and precipitation on coagulation of Kaolin with PACI: effect of sulfate ion.

The effect of the sulfate ion on coagulation with polyaluminum chloride (PACl) was investigated by using an optical monitoring technique together with the conventional jar test procedure and electrophoretic mobility (EM) measurements. The effect of the SO4(2-)/Al ratio, dosage, and pH were examined in detail. The experimental results show that sulfate has a significantly different effect on PACl coagulation as a result of preformed hydrolysis products, where charge neutralization and precipitation play different parts in the coagulation process. The increased rate of coagulation with increasing SO4(2-)/Al ratio can be partially explained by charge neutralization effects, through increased adsorption and complexation of sulfate, thus giving increased particle collision efficiency. Different PACl samples were prepared with different values of B ([OH]/[Al]). For B = 0 (i.e., AlCl3) with mainly monomers, hydroxide precipitation tends to be accelerated in the presence of sulfate, giving significant turbidity removal. The high charge neutralization ability remains for samples with B = 1.5 and 2.0, with large proportions of preformed oligomers and polymers. Sulfate promotes aggregation of hydrolyzed species for B= 2.5, causing significantly improved coagulation efficiency through an electrostatic patch effect. The results illustrate further that particle charge plays a less important role in coagulation after reaching a certain value, while precipitate formation improves coagulation significantly.

Aluminum Hydroxide↗

PubMed2002

Diagnosis and operative treatment of radiation-induced brachial plexopathy.

OBJECTIVE: To explore the diagnosis and operative treatment of radiation-induced brachial plexopathy. METHODS: Nine cases of radiation-induced brachial plexopathy were divided into two groups, 4 cases undergoing neurolysis of brachial plexus as Group A and 5 cases undergoing transfer of myocutaneous flaps after neurolysis as Group B. In Group B, 4 cases were treated with latissimus dorsi myocutaneous flaps (about 20 cm x 20 cm) and 1 case with pectoralis major myocutaneous flap (about 8 cm x 6 cm). RESULTS: All the 9 cases of radiation-induced brachial plexopathy were followed up for a period of 2 to 5 years, with an average of 2.3 years. As far as pain relief and function recovery were concerned, the results of Group B were better than those of Group A. CONCLUSIONS: Based on the results of Group B in the series, we suggest that the procedure of covering the wounds with transferred myocutaneous flaps after neurolysis of the brachial plexus should be performed to those advanced patients. The procedure may improve the blood supply of the fibrotic brachial plexus by reestablishing a good nerve bed.

Adult↗

PubMed2002

[The study of calcification of autogenous bone marrow stem cell transplantation on alveolar bone defect in dogs].

OBJECTIVE: To evaluate the effect of calcification of autogenous bone marrow stem cell transplantation in periodontal tissue regeneration. METHODS: Bone marrow stem cells derived from the same dog were cultured with alpha-MEM. 1 x 10(7) cells of first passage were allowed to attach to the collagen membrane for 24 hours. The membrane-cells were transplanted into periodontal defect in the same dog. Then the defects were covered with e-pTFE membranes. The defects covered only with e-pTFE without membrane-cells were served as control. Eighteen teeth of 6 dogs for every group were studied. The dogs were sacrificed after 6 weeks. RESULTS: The results showed that new bone formation in test group was significantly higher than that of control group. The calcification of new bone in test group was better than control group. CONCLUSIONS: The results suggested that autogenous bone marrow stem cell transplantation with guided tissue regeneration technique could enhance periodontal tissue regeneration and could form new bone tissue fast and could shorten times of periodontal tissue regeneration in dogs.

Alveolar Bone Loss↗