关于铜氨溶液及其在有机化学实验中的应用

从理论和实践两个方面，论述了两种铜氨溶液中配离子生面的机理及其在有机化学实验中的应用。     

论民族传统工艺食雕——靖州雕花蜜饯

食品雕刻是一种艺术,是一种造型艺术。食雕的重要性在悠久灿烂的中国文化中包含了丰富的饮食文化,食雕将日常的饮食与雕刻艺术结合起来,丰富了食品的制作和人们的餐饮方式。人们在品尝美味的同时,可欣赏它的艺术美。雕花蜜饯的一幅幅图案是靖州侗族、苗族人民生活的百科书。我们应借用现代构成理论从符号层面解读靖州雕花蜜饯中的形式能指及文化所指,让这一民间艺术瑰宝绽放出应有的异彩,从而为继承和发扬湘西雕花蜜饯这一雕花艺术形式找到新的途径,同时也是为了保护好雕花这一文化遗产提供具有学术价值的理论支持。     

Detection of Hydrogen Peroxide Photogenerating from a Hypocrellin B Derivative

Hypocrellins,includinghypocrellinA (HA)andhypocrellinB (HB) (Fig .1) ,arenewtypesofphoto sensitivepigments growingabundantlyinChina[1,2 ] .Theyexhibitseveraladvantagesoverhaematoporphyrinderivatives (HPDs) presentlyusedinclinics[3] .Howev er,hypocrellinsarelipophilicagentsandexhibitweakab sorptioninthe phototherapeuticwindow (6 0 0— 90 0nm) ,whichpreventsfurtherinvestigationsontheirbio logicalconsequencesandlimitstheirPDTapplicationclinically .Fig .1　Chemicalstructuresofhypocrellinpare…     

诙诡谲怪 道通为一——楚雕刻艺术的造型与审美

楚人的雕刻艺术是在春秋战国时期楚文化沃土中发育、生长起来的艺术样式，是楚人生命观念的外化。从造型和审美的角度分析，大致可以将其归纳为三种类型：其一，具象造型传达写实性审美特征；其二，复合造型表现虚幻性审美特征；其三，抽象造型体现装饰性审美特征。     

锂离子二次电池用锡基负极材料

锂离子二次电池用锡基负极材料具有高容量、低成本等优势,是目前高容量负极材料的研究热点之一。本文介绍了锂离子二次电池用锡基负极材料的特点及其储锂机理,综述了几种锡基材料的制备方法及性能,并讨论了它们的优缺点。     

Educational Interventions to Improve Dental Anatomy Carving Ability of Dental Students: A Systematic Review

This systematic review aimed to identify the level of impact of educational strategies for teaching tooth carving on the carving ability of undergraduate dental students. The PubMed-NCBI, Cochrane-CENTRAL, LILACS, Ibecs, BBO, Web of Science, and Scopus databases were searched in May 2019, for randomized controlled trials (RCTs) and two-arm non-randomized studies of interventions (NRSI) addressing educational interventions toward the dental carving of undergraduate students. Studies from the year 2000 until the search date, written in English, Portuguese, and Spanish were included. Study screening and data extraction were performed in duplicate and blinded. The data were presented narratively, considering the dental carving ability of students the primary outcome. The risk of bias was assessed using the RoB tool 2.0 and ROBINS-I, and the level of evidence was determined with GRADE. Of 3,574 studies, 6 were included, with 3 RCTs and 3 NRSIs. Very low level of evidence was provided from the NRSIs that flipped classroom (1 study; n = 140) and a student-driven revised module (1 study; n = 264) improved the carving ability of students. Additionally, there was moderate evidence of online complementary material (1 RCT; n = 30) and reinforcement class improving the carving ability of students (1 RCT; n = 29). The replacement of traditional classes by an instructional DVD (1 RCT; n = 73) and assessment of carving projects through digital systems (1 NRSI; n = 79) did not enhance the carving ability of students. Study design, risk of bias, and imprecision downgraded the level of evidence. There was a very low to moderate evidence on the effectiveness of student-driven educational approaches and complementary classes of dental anatomy in improving the dental carving ability of students.     

膜离子转运蛋白对植物盐适应能力的调节机制

细胞质是生理生化反应的集中部位,植物的正常生长发育需要维持胞质内离子的相对稳态。盐胁迫对植物生长发育的主要危害表现为Na 在胞质中的大量累积所造成的细胞生理生化代谢过程的抑制以及胞质内离子平衡的破坏。细胞质维持K /Na 比相对恒定的能力是植物盐适应的决定因素之一,这种能力主要通过膜转运蛋白介导的吸K 拒Na 的选择性吸收、离子外排和区域化等过程来实现。在本文中,作者就膜离子转运蛋白对植物盐适应能力的调节机制作了综述性讨论。     

辽东湾滨海湿地资源景观演变与可持续发展

通过对辽东湾滨海湿地资源近年来的景观演变的研究，分析了区域经济发展及湿地生境自然演变所产生的对生态环境，特别是水禽栖息地的影响。详细阐明了作为生境管理措施的生境更新与生境调整的概念、原则和方法，并以辽东湾湿地为例，探讨了生境更新与生境调整在实现区域可持续发展中具体应用。     

离子色谱法测定水和污水中的微量肼

提出用铂工作电极安培检测器离子色谱法测定水和污水中微量肼的方法,试验了离子色谱仪的操作条件,包括淋洗液的浓度和流量、安培检测器的最佳施加电位,以及样品溶液酸度和干扰元素对测定的影响等.本方法测定的相对标准偏差低于10％,回收率在90％～95％,最低检出浓度为0.005mg/L.测定一个样品仅需5min.     

从徽州木雕管窥儒家思想对民间美术的影响

儒家的精神蕴涵体现了中国传统文化的内在规定性．集中表达了中国传统社会的文化主题。徽州木雕作为中国民间美术的一朵奇葩，自然无法摆脱儒家思想的浸染．其中尤以程朱理学的影响最深。