Obtaining copulation solicitation displays in female canaries without estradiol implants

Female domesticated canaries (Serinus canaria) respond to conspecific song with copulation solicitation display (CSD) between 22 and 27 days after their first offspring has hatched. This period could be used to investigate the acoustical preferences of female canaries. This non-invasive method respects the natural reproductive cycle and could be an alternative to the invasive method of estradiol implants.     

Experimental evidence of the territorial defense,hypothesis in insular Blue Tits

Many insular vertebrates have unusually high population densities and are characterized by behavioural shifts including reduced territory size and reduced situation-specific aggressiveness. Compared to their mainland counterparts, Blue Tits on the island of Corsica exhibit many traits that fit the trends observed in crowded insular populations. We demonstrate from behavioural observations in aviaries and from hormone measurements that Corsican its are less aggressive than mainland ones. These shifts, as well as changes in reproductive patterns, support the defense hypothesis.     

论广告修辞的青年亚文化现象

主流媒体与青年亚文化的两种关系：一、抵抗;二、兼容.作为传播体系的主流媒体,它是统治集团的传声筒,代表着统治集团的利益.而青年亚文化,则代表着处于边缘化、弱势的青年群体的利益,以主流文化的对立姿态呈现出来.但青年亚文化对主流文化的抵抗是仪式化的抵抗,并不能撼动主流文化的根基,这就决定了主流文化具有包容青年亚文化的性质.广告修辞常用的两种亚文化策略：一、酷语化色彩;二、性语化诱惑.生产者和广告策划者植根于亚文化青年的需求心理及行为模式,通过广告修辞的酷语化、性语化等,去迎合亚文化青年的仪式化抵抗.     

热带假丝酵母二型性菌体细胞的形态和结构差异

用光学显微镜和电子显微镜研究热带假丝酵母（Candida tropicalis)的二塑性，菌丝体（M）和单细胞酵母（Y）形态差异很大，M是长管状多,细胞 相连，Y则是球形的单个细胞，内部结构上也体现了与其形态的相适应性，M菌丝顶端大的液泡为菌丝的延伸提供压力，但当顶端生长芽管时，大液泡会分裂成小液泡，部分小液泡进入芽管；菌丝顶端和侧面的泡囊，与其顶端生长和侧枝发生有关，单细胞酵母中，靠近母细胞和子细胞相连的部位，有些囊泡和颗粒物质，可能与细胞的新壁形成和分开有关。