Preservice teachers’ implementation of formative assessment in English writing class: Mentoring matters

This multiple-case study investigated the experience of three preservice teachers who attempted formative assessment (FA) strategies in their English as a second language writing class during their teaching practicum in a secondary school in Hong Kong. Based on data from 17 lesson observations and 24 interviews, the study examined the three teachers’ implementation of FA strategies during cycles of pre-, while- and post-writing stages. Also analyzed are the teachers’ reflections on and their mentors’ and students’ evaluation of their FA implementation. The study found the teachers could translate their understanding of FA principles into teaching and assessment strategies appropriately, but the school’s accountability culture worked against their innovation. School mentors’ open-mindedness and support to their FA attempts were found to be crucial. The findings are discussed centering on key issues in the relational, developmental and contextual dimensions of the teaching practicum and their impact on preservice teachers’ practice and attitude.     

黄枝油杉和矩鳞油杉的核型研究

本文研究了黄枝油杉Keteleeria calcarea Cheng et L．K．Fu．和矩鳞油杉Keteleeria   oblonga Cheng et L. K. Fu. 的核型。  并与江南油杉 K．cyclolepis Flous．和台湾油杉  K.   formosana Mast. 的核型比较，讨论四种油杉核型进化趋势。  黄枝油杉核型公式K(2n)=   24＝16m+8sm;矩鳞油杉核型公式K(2n)=24＝18m+6sm。  黄枝油杉在第1、3、6号   染色体短臂上具次缢痕;而矩鳞油杉在第2、4、6号染色体短臂上具次缢痕。二者均属较对称  的“2A“核型。  四种油杉核型进化趋势是江南油杉→矩鳞油杉→黄枝油杉→台湾油杉。     

不同视角下的语言迁移

语言迁移是二语习得过程中的特殊现象,母语干扰说、创造性重构说和深层共享假设从不同的视角对母语在二语学习过程中的角色进行了分析和探讨。母语的角色从被否定到重新被肯定的转变,揭示出语言迁移是一个与其他因素相互作用的复杂过程。     

酸角果荚色素的提取及性能初探

以酸角果荚为原料,用碱液提取天然棕色素,并对所提取的色素进行初步理化性质研究．实验结果表明：该色素在弱酸、中性、弱碱性条件下均稳定,对光、热稳定性好,对大部分金属离子稳定,是一种应用范围较广的天然色素,也为酸角的利用提供了一条新的途径．     

核盘菌多聚半乳糖醛酸酶基因的克隆及hpRNAi载体的构建

多聚半乳糖醛酸酶是核盘菌致病力发挥作用的关键酶。本研究用PCR的方法从核盘菌基因组DNA中扩增出多聚半乳糖醛酸酶（PG5）基因片段,再以扩增出的PG5基因片段作为模板设计引物扩增出一个相应较小的片段。将两个PG5基因片段反向插入到植物表达载体2300 sn的35S启动子和nos终止子之间,构建出可转录表达出发夹RNA结构的组成型油菜RNA干扰载体,为今后油菜利用RNA干扰抗菌核病的基因工程研究奠定了基础。     

百合属中的四合花粉兼论玫红百合的分类问题

根据我们对国产百合属(Lilium)引种植物花粉形态的观察，已知该属有二个分类群具四合花粉, 本文依据花粉形态、外部形态及地理分布的特点，对其分类问题进行了讨论。     

Assessing the impact of organizational practices on the relative productivity of university technology transfer offices: an exploratory study

We present quantitative and qualitative evidence on the relative productivity of university technology transfer offices (TTOs). Our empirical results suggest that TTO activity is characterized by constant returns to scale and that environmental and institutional factors explain some of the variation in performance. Productivity may also depend on organizational practices. Unfortunately, there are no quantitative measures available on such practices, so we rely on inductive, qualitative methods to identify them. Based on 55 interviews of 98 entrepreneurs, scientists, and administrators at five research universities, we conclude that the most critical organizational factors are faculty reward systems, TTO staffing/compensation practices, and cultural barriers between universities and firms.