Genetic Determination and Exogenous Influence in Sex Differentiation in Crustacean

The mechanisms of sex determination and the influence of exogenous factors on sex differentiation in crustacean were reviewed in the paper.Most of crustecea have not obviously sex chromosome.Androgenic gland was reported as the most important sex differentiation factors,implanting or cuting AG can change the sexal characterization of larval in crustacean.Although sex differentiation of crustacean is determined by gene,it is affected by exogenous factors such as parasite,photoperiod,temperature or hormone.Most cultured species have different body weight and length between male and female,this can be used in aquaculture to produce all male or female crusteceans to improve the production.

代际话语与性别话语的混杂及融通——《彼得·潘》的性别政治兼论儿童文学“不可能性”的理论难题

《彼得·潘》是一部“反成长”主题的童话,在儿童与成人“代际”的框架中,内蕴着性别界分及社会角色预设的刻板印象。这种脱逸于儿童镜像“母本”的性别意识的“发现”,因被更深层次的性别政治消蚀而遮蔽了“完全生命”形态的儿童主体性。身份问题是性别政治的原点。在对位置与声音的配置过程中,不同话语诉求所形构的博弈介入了性别政治的空间赋义。罗丝基于该文本而阐发“儿童小说之不可能”的质疑,构筑于儿童文学借成人来反成人的逻辑上,触及了儿童文学的本体问题。对于这种质疑的反思路径是返归儿童文学的“元概念”,深植于文本内外的情境与结构的内核,融通儿童文学“描述性”概念与“结构与关系”概念的可能性。