丝蛋白为单分子模板诱导牙体组织样羟基磷灰石体外仿生合成

目的依据生物矿化的有机基质调控理论,实现牙体硬组织样羟基磷灰石的体外仿声合成。方法运用碳乙基二亚胺盐酸盐和N-羟基丁二酰亚胺介导缩合反应将蚕丝蛋白以肽键键合到牙体组织表面,覆盖原来的-NH3位点,以过饱和矿化液作为离子供体实现晶体生长。结果所得晶体呈矮柱状,30~50nm长,垂直于牙体组织表面,相互平行排列。经X射线衍射（XRD）和扫描电镜（SEM）检测证实新生晶体为羟基磷灰石,硬度接近正常牙本质。结论本研究初步实现了牙体组织样羟基磷灰石的体外仿生合成。     

腹腔镜治疗精索静脉曲张不同方式处理血管的疗效分析

目的探讨实用于基层医院治疗精索静脉曲张的优选方法。方法对近3年收入住院的30例精索静脉曲张采用腹腔镜手术治疗,高位集束结扎切断20例,单纯精索内静脉结扎切断10例,两种术式对比。结果术后复检精液质量均有提高,两者治疗效果经统计学处理无差异(P>0.05)。结论治疗精索静脉曲张,采用腹腔镜高位集束结扎并离断血管快速有效,能检测出结扎是否牢固,减少复发并发症的发生,选用丝线结扎价廉安全。     

Corn oligopeptides protect against early alcoholic liver injury in rats

Background

The present study aimed to investigate the effects of corn oligopeptides (COPs) on early alcoholic liver injury in rats. A total of 70 Wistar rats were randomly assigned to 7 groups, including a normal control group, 3 alcohol control groups (2.0, 4.0 and 6.0 g/kg/BW ethanol), and 3 COP intervention groups (2.0, 4.0 and 6.0 g/kg/BW ethanol, with 900 mg/kg/BW COPs). The study duration lasted for 4 weeks. Serum markers were assayed, and a histopathological examination was conducted.

Results

We found that the COP treatment prevented the elevation of serum aminotransferase and alleviated the hepatic histological damage that was induced by alcohol. In addition, the COPs counteracted the changes in the SOD activity and the MDA content in serum. Furthermore, the COPs ameliorated the abnormal lipid metabolism.

Conclusion

These findings suggest that COPs have a significant protective effect on early alcoholic liver injury in rats.     

聚氨酯与丝素粉体共混膜的血液吸附性

背景：为了改善医用聚氨酯的亲水性和血液相容性,利用共混的方法制备聚氨酯/丝素粉体共混膜,但是粉体的加入会显著提高共混膜的吸水性,因此会影响体外血液相容的表征。 目的：观察丝素粉体的加入对聚氨酯/丝素粉体共混膜亲水性和血液吸附性能的影响。 设计、时间及地点：体外对比观察实验,于2008-08/10在武汉科技学院新型纺织材料绿色加工及其功能化教育部重点实验室和医院实验室完成。 材料：蚕丝纤维由浙江桐乡市思源纺织有限公司提供,医用聚氨酯由DOW Chemical 公司提供。 方法：将蚕丝纤维在质量浓度为10 g/L,浴比为1∶20的Na2CO3溶液中煮沸3 h,洗涤晾干后利用自制磨盘磨制成乳白色粉体而得到非水溶性丝素粉体。将丝素粉体加入到聚氨酯溶液中利用液体交换的方法制备了不同丝素粉体含量(0%,10%,30%,50%,70%)的聚氨酯与丝素粉体共混膜。 主要观察指标：扫描电子显微镜观察共混膜表面形貌。计算单位体积共混膜上吸附血液红细胞、白细胞、血红蛋白、血小板的数量。 结果：当丝素粉体含量在50%以下时,丝素粉体被包含在聚氨酯大分子中间。当丝素粉体含量在70%时,丝素粉体均匀分布在共混膜表面。随着丝素粉体含量的增加,共混膜吸附血液各组分数量增加。随着时间的延长,共混膜吸附血液的量增加,直到达到动态平衡。在吸附动态平衡过程中,血小板的吸附量下降,主要归功于丝素粉体对其他细胞吸附能力要强于血小板。 结论：丝素粉体加入可以明显改善材料的亲水性,并且随着丝素粉体含量的增加,共混膜对血液的吸附能力增强。     

纬编织物增强小口径丝素聚氨酯人造血管的力学性能研究

通过在涤纶/氨纶管状织物上复合丝素/聚氨酯的方法制作一种复合结构的小口径人造血管,这种复合结构的人造血管截面显现多微孔结构,并且微孔分布均匀,内表面也较光滑.力学测试的结果表明,随着管壁厚度的增加,人造血管的断裂强力、断裂功和初始模量都上升;随着氨纶含量的增加,人造血管的断裂功和初始模量下降,但断裂伸长和断裂强力先增大...     

Subchronic toxicity study of corn silk with rats

Aim of this study

Corn silk is a traditional herbal medicine in China, which has been used in many parts of the world for the treatment of edema as well as for cystitis, gout, kidney stones, nephritis, prostatitis and similar ailments. However, there is little scientific evidence about its safety. As a part of its safety assessment, a subchronic toxicity was performed in this paper.

Methods

The subchronic toxicity was investigated in male and female Wistar rats by dietary administration at concentrations of 0.5%, 2.0% and 8.0% (w/w) for 90 days. Overall health, body weight, food consumption, hematology, blood chemistry, organ weights, gross and microscopic appearance of tissues were compared between test and control groups.

Results

A number of significant differences were seen between groups, but none of them was considered to be adverse. Based on the present study, the no-observed-adverse-effect level (NOAEL) of corn silk is at least 8.0% which corresponds to a mean daily corn silk intake of approximately 9.354 and 10.308 g/day/kg body weight for males and females, respectively.

Conclusion

The results obtained in the present study suggest that consumption of corn silk has no adverse effects and support the safety of corn silk for humans.     

蜘蛛和蛛丝在生物医药等领域的开发与应用前景

就国内外对蜘蛛、蛛丝及蚕丝成分的研究与应用现状进行综述,着重阐述了蜘蛛及蛛丝存医疗保健上的应用情况,并从生物医药等角度论述了蜘蛛及蛛丝的开发与应用价值,提出利用基因技术仿蚕丝药品及保健品对开发研究蜘蛛系列药品及保健品具有十分重要的意义。     

Effect of corn gluten and its hydrolysate consumptions on weight reduction in rats fed a high-fat diet

This study examined the effects of corn gluten (CG) and its hydrolysate consumptions on weight reduction in rats fed a high-fat diet. Eight-month-old male Sprague-Dawley rats (n=40) were fed a high-fat diet (40% calorie as fat) for 4 weeks. They were then randomly divided into four groups and fed the isocaloric diets with different protein sources for 8 weeks. The protein sources were casein (control group), intact CG (CG group), CG hydrolysate A (CGHA group, 30% of protein as peptides and 70% as free amino acids) and CG hydrolysate P (CGHP group, 93% of protein as peptides and 7% as free amino acids). Body weight gain, adipose tissue weights, nitrogen balance, absorptions of energy, protein and fat, lipid profiles in plasma, liver and feces and hepatic activities of carnitine palmitoyl transferase (CPT), fatty acid synthase (FAS), malic enzyme (ME) and glucose-6-phosphate dehydrogenase (G6PDH) were assessed. The CGHA diet had the highest amount of BCAAs, especially leucine, and most of them existed as free amino acid forms. The CGHA group showed significant weight reduction and negative nitrogen balance. Protein absorption and apparent protein digestibility in the CGHA group were significantly lower than those in other groups. Adipose tissue weights were the lowest in the CGHA group. Activity of CPT tended to be higher in the CGHA group than in other groups and those of FAS, ME and G6PDH were significantly lower in the CGHA group than in other groups. In conclusion, the CGHA diet which had relatively high amounts of free amino acids and BCAAs, especially leucine, had a weight reduction effect by lowering adipose tissue weight and the activities of FAS, ME and G6PDH in experimental animals, but it seemed to be a negative result induced by lowering protein absorption, increasing urinary nitrogen excretion and protein catabolism.     

百年来出土简帛涉医文献概述

一个世纪以来,在我国陆续出土了成批简牍帛书,其中有数量可观的医学文献,涉及当时医药卫生的各个方面,具有重要的学术价值。故试将涉医简帛文献的出土概况进行概述。