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食品致病菌快速检测技术及其应用前景
近年来,沙门氏菌、李斯特氏菌、大肠杆菌O157、弯曲杆菌等食品致病菌已成为危害食品安全的头号杀手.而以往反复增菌、菌落分离及多种生化、血清学鉴别实验等常规食品微生物检测方法操作复杂、耗时长,难以满足飞速发展的现代食品生产和流通领域对检测速度的要求.
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改良法制备异种脱蛋白骨复合重组人骨形态发生蛋白支架修复长骨大段骨缺损
BACKGROUND: For its extensive sources and specific biological characteristics, heterogeneous deproteinized bone (DPB) as the tissue-engineered scaffold material gets a good application prospect in repair of large segmental bone defects.OBJECTIVE: To prepare scaffold material by compositing modified heterogeneous DPB with recombinant human bone morphogenetic protein 2 (rhBMP2) and evaluate the osteogenic ability in repairing large segmental long bone defects in large-sized animals.METHODS: Twenty-four goats were randomly and evenly divided into three groups: DPB, autologous bone, and DPB+rhBMP2. Bone defects (20% in length) were made in the middle and lower segments of the right tibia of each goat, and according to group design,different bone grafts were implanted and fixed using semi-ring slot external fixer. At 4-24 weeks after surgery, X-ray examination was performed once every other 4 weeks. At 24 weeks after surgery, newly formed bones were taken out for determining the repair effects of bone defects through duat-energy X-ray analysis, histological observation, and biomechanical analysis.RESULTS AND CONCLUSION: The prepared DPB exhibited a three-dimensional porous structure, with a porosity of (78.5±6.45)% and pore size of (472.5±7.02) μm. Time-dependent bone repair was found in each group. Results regarding anti-compression test, three-point anti-bend test, and anti-torsion test were greatest in the autologous bone group, followed by the DPB+rhBMP2 group, and lastly the DPB group. There were no significant differences in tibial bone density, bone mineral content,anti-compression pressure and ultimate pressure, anti-bending load and ultimate toad, anti-torsion torque and ultimate torque between autologous bone group, DPB+rhBMP2 group and normal bone control group. These findings indicate that modified heterogeneous DPB composited with rhBMP2 has osteogenic ability equivalent to autologous bone in repairing large segmental long bone defects in goat tibias. Therefore, it can be applied as tissue-engineered scaffold material.
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中草药葛根在现代美容领域应用前景的研究进展
随着现代美容业的快速发展和人们保健意识的增强,中草药美容作为一种新型的美容方式逐渐被人们认可,并以其自然、副作用小、毒性弱,并具有保健功能等特点受到了整个美容界的推崇.常见的用于美容的中草药主要集中在当归、党参、首乌等滋阴补气的药物中,并以内服为主;葛根用于美容的研究并不多见,主要以其丰胸的作用为主[1].本文就葛根的药理药性,深入分析其未来可能的应用前景,现综述如下.