精英文化与大众文化在丹·布朗小说中的共融

自20世纪90年代大众文化迅猛发展以来,精英文化和大众文化就一直备受国内外研究者的关注。大众文化的兴起和精英文化的衰落引发了不少学者对未来文化走向的讨论。在一些作家的创作中也不自觉地流露出了对这两种文化的态度。美国作家丹·布朗则将两种文化共融在自己的小说中,向我们展示了一种多元化的文化共融趋势。     

桃金娘色素对果蝇寿命和繁殖力的影响

用含0.1%盐酸的96%乙醇溶液提取桃金娘(Rhodomyrtus tomentosa)成熟果实色素,研究在培养基中分别添加0.20%、1.00%、3.00%、5.00%桃金娘色素粉末对黑腹果蝇寿命和繁殖力的影响。结果表明:0.20%~3.00%桃金娘色素处理可延长果蝇的平均寿命、最高寿命及半数死亡时间,提高果蝇子代数量,同时对雄性果蝇平均寿命的延长率优于雌性果蝇;1.00%桃金娘色素处理的果蝇表现出最好的延寿和繁殖力增强的效果;5.00%桃金娘色素处理对雄性和雌性果蝇的平均寿命、最高寿命及半数死亡时间没有显著影响,但果蝇子代数量显著降低。     

牵牛花红色素的提取与应用

用新鲜的牵牛花花冠为原料提取的红色素，经试验测试与应用比较，发现其具有上好的酸碱指示性能．是所有用植物色素制取的酸碱代用指示剂中，指示效果最好、灵敏度最高的一种．     

杨梅红色素与几种金属离子作用效应的研究

研究了杨梅红色素与几种金属离子的作用效应。试验结果表明:Na 、Ca2 、Cu2 、Zn2 、A13 对杨梅红色素无不良影响,而Sn2 、Fe3 、Pb2 对杨梅红色素则存在不良影响。     

La obra de Roger Brown. El Jardín del Edén en los estudios sobre adquisición del lenguaje. In memoriam

Resumen

Con este artículo queremos rendir homenaje a la figura de Roger Brown, fallecido en Diciembre de 1997, y hacer un resumen de su obra que fue pionera en los estudios sobre adquisición del lenguaje. En la década de los 60 Roger Brown constituyóun equipo de investigación que se planteó como tarea descubrir los mecanismos por los cuales los niños desarrollan el lenguaje. Los trabajos de Roger Brown plantearon los principales temas de la Psicolingüística evolutiva en cuanto a la adquisición del léxico y de la sintaxis: relación entre desarrollo del vocabulario y desarrollo conceptual, influencia de la sintaxis en la adquisición del léxico, estadios y procesos en la adquisición de la sintaxis, papel del input, participación de los padres en la adquisición. Desarrolló como métodos principales el análisis del lenguaje espontáneo en situaciones de interacción y el estudio experimental en tareas de comprensión, y definió la longitud media de los enunciados (LME) como una medida adecuada del desarrollo morfo-sintáctico.     

荔枝皮色素的提取及性能测试

本文对荔枝皮色素的提取及性能作了初步研究,该色素颜色鲜艳,易于提取且稳定性好,它是一种有开发应用价值的天然色素。     

Riding the Reciprocal Teaching Bus. A Teacher’s Reflections on Nurturing Collaborative Learning in a School Culture Obsessed by Results

This article examines the author’s interactions with the teaching strategy known as Reciprocal Teaching, sometimes also called Reciprocal Reading, which involves students learning to read collaboratively in small groups. Reciprocal Teaching typically involves students teaching each other by following a rubric of activities that are aimed at primarily improving their comprehension skills. In brief, students read a text in a group and collectively try to understand it, using prescribed procedures. This article scrutinises the original research by Palincsar and Brown which created the strategy and questions some of its claims. While many other investigations into Reciprocal Teaching have aimed to prove or disprove its efficacy, this enquiry studies the discourses which inform the strategy, arguing that there are problems with its presentation in the original article which have affected subsequent representations of Reciprocal Teaching. The article shows how the author, an English teacher in a large secondary school, taught Reciprocal Teaching to teenagers for a year and argues that the presentation of Reciprocal Teaching he read in a well-regarded teaching handbook caused him to deploy Reciprocal Teaching problematically. It was only when he taught Reciprocal Teaching in a more imaginative fashion that he found greater success.     

苦水玫瑰花的色素化学成份及性质研究

用UV和化学方法研究确定了苦水玫瑰花的色素主要成份是矢车菊-3-葡萄糖苦和辅色素树皮黄素管等。该色素在中性和弱酸性溶液中为玫瑰紫红色,弱碱性溶液中呈蓝绿色,对光和热有一定的稳定性。     

The presence of trapped carbon dioxide in lapis lazuli and its potential use in geo-sourcing natural ultramarine pigment

The source of the previously unassigned weak band at 2340 cm⁻¹ that is occasionally observed in the infrared spectrum of natural lapis lazuli pigment is here attributed conclusively to CO₂ trapped in the β-cage of lazurite. In addition, the geo-sourcing potential of this infrared feature for lapis lazuli is tested and found to be more ambiguous than previously suggested. The CO₂ absorption band is in fact observed in lapis lazuli samples from numerous disparate geographic locales including Afghanistan, Canada, Myanmar, Siberia, Tajikistan, and the Ural Mountains, as well as mineral hauyne samples from Germany and Italy. The spectral feature was absent from lapis lazuli samples from California, Chile, Colorado, and New York. Furthermore, poor quality lapis lazuli samples, regardless of locale, highly processed natural pigment samples, and all samples of synthetic ultramarine blue, green, and violet pigments were devoid of encapsulated CO₂.     

The white colour in Etruscan polychromes on terracotta: Spectroscopic identification of kaolin

The present work reports on a spectroscopic study of white colour samples collected from Etruscan polychromes on terracotta from the Cerveteri area. In particular, both white-on-red potsherds of the Orientalising period and high-value polychromes of the Archaic period were considered. The white pigment, a fundamental element in this class of artworks, was not clearly identified in previous archaeological and analytical studies, although the use of kaolin was tentatively proposed. Therefore, samples from the Monte Sughereto kaolin quarry in the Cerveteri area were also studied. The results of detailed analyses carried out using micro-Raman spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy first show that the quarry material is a high-purity kaolin containing quartz. Raman results strongly suggest that the same kind of kaolin was employed in the polychromes of the Archaic period. As to white-on red potsherds, infrared results have a key role in showing that the white pigment is a kaolin closely corresponding to the quarry material since a particular kaolin polytype (dickite) is dominant in both cases. The present work thus provides the first definitive identification of the white pigment used in Etruscan polychromes on terracotta from the Cerveteri area, and suggests that the source of kaolin might be the Monte Sughereto quarry.