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羟基磷灰石的微波快速烧结研究 总被引：5，自引：0，他引：5
羟基磷灰石与脊椎动物的牙齿和骨骼组织的组成极为相似，研究表明它与这些生理组织具有良好的亲合性．羟基磷灰石作为牙齿和骨骼移植材料的研究越来越受到重视．利用自行研制的微波烧结系统对羟基磷灰石进行烧结研究．经过１０００～１０５０℃保温２分钟的微波烧结可以获得超微结构（平均晶粒尺寸为３００纳米），密度大于９８％ＴＤ（理论密度）的羟基磷灰石．同时还对微波烧结过程中的加热特征及热失控的作用展开了讨论． 相似文献
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INTRODUCTIONCoronaryarterydisease (CAD)continuestobethemajorcauseofmorbidityandmortalityinourcountry .TheactivityofbloodcoagulationfactorshasbeenshowntobeanimportantriskindicatorforCAD .However,circulatinglevelsofcoagulationfactorsmaynotaccuratelyreflectt… 相似文献
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Objective: To determine whether polymorphisms in the genes for coagulation factor. II, V, VII could predispose an individual
to increase risk for coronary artery disease (CAD) and/or myocardial infarction (MI) in Chinese. Methods: We screened coagulation
factor II(G20210A), V(G1691A), VII (R353Q and HVR4) genotype in 374 patients undergoing coronary angiography by polymerase
chain reaction and restriction fragment length polymorphism (PCR-RFLP) assay. Results: The R353Q and HVR4 gemotype of the
factor VII distribution was in accordance with Hardy-Weinberg equilibrium. The frequencies of FVII genotype or allele did
not show statistically significant differences between CAD group and controls or between male and female. The frequencies
of the Q allele and (RQ+QQ) genotype were significantly higher among the CAD patients without myocardial infarction (MI) history
than among those with MI history (P<0.05). However, HVR4 polymorphism was not significantly different within groups. We only find one normal control of factorII
(G20210A) mutation. No coagulation factor V(G1691A) mutation was found in the CAD patients and controls. Conclusion: The factor
II(G20210A), V(G1691A) mutation is absent and may not be a major genetic factor for CAD and/or MI; the Q allele of the R353
Q polymorphism of the factor VII gene may be a protective genetic factor against myocardial infarction in Chinese.
Project (No. 021103166) supported by a grant from the Key Project of Science and Technology Commission of Zhejiang Province,
China 相似文献
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