BACKGROUND: Previous research reveals that, the morphous, structure, physicochemical property and mechanical characteristics of matrix in buffalo cornu all contribute to the biomaterials in the field of orthopaedics.OBJECTIVE: To investigate the correlation between the duration of matrix in buffalo cornu soaked in 30% hydrogen peroxide and the antigenicity, the biomechanical intensity of matrix in buffalo cornu treated by deproteinization.DESIGN, TIME AND SETTING: Measurement experiments were performed in the Mechanics Laboratory, Kunming University of Science and Technology (Kunming, Yunnan, China) from February to March in 2000.MATERIALS: Buffalo was provided by Luxi Abattoir of Yunnan Province (China), and then processed into test pieces at a nominal thickness.METHODS: The metric test pieces were rinsed with distilled water and soaked by chloroform-methyl alcohol at a ratio of 1:1 for 48 hours, then in 30% hydrogen peroxide for 24 and 48 hours, which served as the experimental group. While those remaining untreated were taken as controls.MAIN OUTCOME MEASURES: The modulus of elasticity and compressive strength were measured by electric measurement method and direct pressurization method, respectively.RESULTS: The modulus of elasticity between the experimental group and the control group had no significant difference (P>0.05). The compressive strength in the control group was significantly higher than that in the experimental group (P<0.01), and there were no significant differences between the experimental group treated for 24 hours and the experimental group treated for 48 hours (P>0.05).CONCLUSION: Subsequent to soaking in 30% hydrogen peroxide for 48 hours, the matrix in buffalo cornu maintains better biomechanicai intensity.

0.05) found between the three subtypes of osteosarcoma with rates of the A deletion being 30% (3/10), 40% (2/5), and 40% (2/5) in three subtypes, respectively. The T16519C mutation and the A deletion in the nucleotide position 16 132 (5′ end) were co-detected in 4 (20%) out of 20 samples. The levels of the two mutations in patients with osteosarcoma were significantly higher than those in healthy human. Conclusion The two mutations have high rates in osteosarcoma and may play an important role in carcinogenesis and progression of osteosarcoma.

Objective:To prepare compound isosorbide mononitrate sustained-release capsules and study the drug release. Meth-ods:Isosorbide mononitrate pellets were prepared by the fluidized bed coating technology. The influencing factors in the preparation process were examined and the major factors were optimized by single factor experiments. The drug release was determined by HPLC. The best formula was screened by optimizing aspirin coating solution. Results:The compound isosorbide mononitrate sustained-release capsules were prepared by the best formula. Both the two drugs could achieve promising release, and in vitro release behavior of isosor-bide mononitrate was fitted Higuchi equation,which was similar to that of the imported preparations. The release of aspirin in acidic and alkaline media was in coincidence with the release requirements. Conclusion:The formula is reasonable and the preparation process is stable with promising sustained release property.

With the intensification of population floating in China, there has been a growing demand for ecdemic medical care. Because basic medical insurance in China conduct localized management, the differentiation between reimbursement policy and level in different areas result in the difficulty of immediate settlement. The great quantity of floating population are faced with rather heavy personal burden when need medical care at different locations, which to some extent restrict in-time healthcare for floating population. On the basis of analyzing the features of endemic medical care for floating population, it described three mode of typical immediate settlement on ecdemic medical care, discussed the main problems in restricting the flowing population get immediate settlement at different locations and put forward suggestions on improving the immediate settlement at different locations.

Precise location of liver segments has great significance in diagnosis and treatment of hepatic disease. In recent years, medical imaging and three-dimensional imaging techniques provide more diagnostic information about the location of liver segments and research methods for finding more precise liver segment classification. The progresses of hepatic segment imaging were reviewed in this article.

Objective To study and research the clinical pathologic features, immunohistochemistry and prognosis of epidermoid cyst with cancerous changes. Methods Six cases of epidermoid cyst with cancerous changes were studied of their clinical pathologic features and immunohistochemistic expression and their prognosis was evaluated by follow-up vis-its. Results Clinical features: All six cases showed local enclosed mass and underwent extensive resection. No recur-rence nor metastasis were shown in one year follow up. Pathological examination show irregular cystic mass with bean curd like fillings in it. Microscopic examination showed those cysts were lined with squamous epithelium which indicate invasive growth. Pathological diagnosis: Epidermoid cyst canceration to squamous cell carcinoma. Immuno-phenotype: CK 5/6 and P63 were positive in all six squamous cell cancer cases. Conclusion Epidermoid cyst with cancerous changes are quite rare. Diagnosis of the tumor largely relies on histopathology and immunohistochemical markers also assist diagnosis. Local appropriate expanded resection is preferred. Its malignant degree is low and prognosis is good.

This study is to evaluate the HAART pharmacodynamics with dolutegravir as the "anchor" in vitro. A nucleoside reverse transcriptase inhibitors (NRTIs) resistant recombinant virus model (VSVG/HIV-1(RT-D67N,K70R,T215F)) and an integrase inhibitors (INIs) resistant recombinant virus model (VSVG/HIV-1(IN-G140S,QI48H)) were constructed and established. The anti-viral pharmacodynamics was evaluated with drug combinations including two NRTIs along with one INI or one NNRTI. The results showed that the combination with an INI gave a stronger synergism on wild type HIV-1 replication comparing to that with an NNRTI. Comparing the two INIs as the "anchor" for HAART, DTG exhibited an equivalent CI to that of RAL on wild type HIV-1 replication; but a greater synergy than RAL on INI-resistant HIV-1 replication. Besides of the pharmacodynamics results of DTG-based drug combination, the results may contribute to clinical antiviral therapy.

OBJECTIVE：Rare-earth compound was added to the medium of Ganoderma lucidum to study the effect of rare-earth elements on the hypha growth,the fresh and dry weight of fruit body of G.lucidum.METHODS:The culture medium dressed with rare-earth elements.RESULTS:It showed that all concentrations of rare-earth elements had some inhibition on the hypha growth of G.lucidum.However they could make the hypha of G.lucidumwhiter.The fresh and dry weight of fruit body increased significantly when the concentrations of rare-earth elements were 100μg.g-1 and 150μg.g-1.Their raising rates were +4.13%，+0.20% and +16.47，+5.84%respectively.CONCLUSION:The yield of G.lucidum can be increased by rare-earth elements when its concentrations were 100～150μg.g-1.

Asparaginase ; adverse effects ; Child ; Child, Preschool ; Desensitization, Immunologic ; Drug Hypersensitivity ; therapy ; Female ; Humans ; Male ; Precursor Cell Lymphoblastic Leukemia-Lymphoma ; drug therapy

Objective To investigate the thyroglobulin antibody (TGAb) and thyroid microsomal anti-bodies (TMAb) under different conditions in the serum Stability. Methods Measured by radioimmunoassay place at room temperature, 4℃ refrigerator, ice conditions, the different time periods in serum samples of TGAb and TMAb activity. Results Three conditions in the storage Two days later the results of no signifi-cant difference; stored 4 days at room temperature samples TGAb and TMAb inactivation; storage 6 days, 4 ℃ refrigerator under the conditions of the samples TGAb and TMAb inactivation; store 29 days later, the frozen samples under the conditions of TGAb and TMAb inactivation. Conclusion 4 ℃ refrigerator used to preserve blood samples for further screening for thyroid antibodies, the most suitable for day-to-day clinical work.