寄生虫

在八九月里,让我们找一个正对太阳的斜坡,那儿往往热得烫手,因为太阳已经把它快烤焦了。恰恰是这种温度像火炉一般的地方,我们可以得到很大的收获。这一带热土,往往是黄蜂和蜜蜂的乐土。它们往往在地下的土堆里忙着料理食物——这里堆上一堆象鼻虫、蝗虫或蜘蛛,那里一组组分列着蝇类和毛毛虫类,还有的正在把蜜贮藏在皮袋里、土罐里、棉袋里或是树叶编的瓮里。     

梭罗日记

1837年这一年梭罗从哈佛大学毕业,回到了故乡——马萨诸塞州的康科德。不久他就与另一位美国文学史上的非凡人物、住在邻近的拉尔夫·沃尔多·爱默生(拉尔夫·沃尔多·爱默生,1803—1882,美国散文家、思想家、诗人、演说家和美国19世纪超验主义文学运动的领袖。著有《论自然》、《人生的行为》等)有了密切的交往。也许部分要归功于爱默生榜样的作用,梭罗也开始了写作。他回到家乡后不久就开始写日记。当时写的日记只保存下来一部分,它们不仅包括作者个人的观察和一般的感想,还大量抄录他正在阅读的古典作家著作的段落——在某种程度上可以称作“备忘录”。此时他的文字风格还不够成熟,有一部分读起来颇为枯燥,但那不时闪烁的智慧的火花,却预示着一种完全个性化的、才华横溢的写作风格即将出现。     

应用由乳化-扩散方法制备的功能PLGA纳米颗粒的药物发送系统(英文)

运用功能纳米颗粒的药物发送系统是一种具有发展前景的途径,因为它减少了副反应并减轻病痛 Poly(D,L lactide co glycolide)(PLGA)纳米颗粒的尺寸是80nm,它的制备是通过乳化扩散方法,并应用Poloxamer188作为稳定剂 所制备的纳米颗粒具有疏水核作为药物的载体,而其冠状亲水表面可避免形成网状内皮系统(RES) 作为生物医学应用的第一个例子是PLAG纳米颗粒包含雌激素,它对于受到意外伤害而抑制不安情绪具有局限性 研究指出:局部地发送具有雌激素的PLGA纳米颗粒将激烈减少新内膜的形成程度 其次是应用经过修改的PLAG纳米颗粒发送系统专用于骨治疗的药已经实现,它与骨有高度的相似 已经证明:与双磷酸(bisphosphonate)相结合的PLGA纳米颗粒,参入到鼠的静脉内之后,将可累积在鼠骨内     

An ecological analysis of after-school program participation and the development of academic performance and motivational attributes for disadvantaged children

This longitudinal study evaluated after-school program (ASP) participation and the development of academic performance (school grades, reading achievement) and teacher-rated motivational attributes (expectancy of success, effectance motivation) over a school year. Participants were 599 boys and girls (6.3 to 10.6 years) from an urban, disadvantaged city in the United States. An ecological analysis of after-school arrangements identified 4 patterns of care: ASP care, parent care, combined parent/self-sibling care, and combined other-adult/self-sibling care. Aspects of academic performance and motivational attributes were significantly higher (p<.05) at the end of the school year for children in ASP care compared with those in the 3 alternative patterns of care. Differences were marked for children rated as highly engaged in ASP activities.     

Trade-offs in the study of culture and development: theories, methods, and values

The commentators are unanimous in their support for our general orientation to culture and development, and for the pathways we have identified, and they suggest ways to enrich our approach to theory, methods, and values. We view their main suggestions as relating to trade-offs: between theories that highlight generalizations or exceptions; between methods that rely on one-, two-, or multiculture studies; and between values involving individuation or accommodation. Here, we describe ways to find an optimal balance in each instance.     

教师的个人品质

作为教师需要具备哪些品质?也许可能没有哪两个人会列举出完全相同的几条,但是我认为下面几条会得到大家赞许的。首先,作为教师的性格要愉快、活泼,并具有吸引力。这并不排除相貌平平甚至丑陋者,因为这些人当中不少性格是很可爱的。但应该排除下列类型的人:太容易激动的,忧     

Multiple description coding with spatial-temporal hybrid interpolation for video streaming in peer-to-peer networks

INTRODUCTION Multimedia services over the Internet are be- coming popular due to the widespread deployment of broadband access. However, the conventional cli- ent-server architecture severely limits the number of simultaneous users, especially for bandwidth inten- sive applications such as video streaming. P2P net- works, on the other hand, offer a solution to the scalability problem. As a node joins a P2P network, it not only consumes resources but also contributes its bandwidth or comp…     

模范校长

第六学校是杰巴利采沃市的一所优秀学校。在短短的十年中间,这所学校的面貌焕然一新,这是和模范校长克拉玛连柯分不开的。克拉玛连柯牢牢地抓住了学校的主要环节——全体教师。她认为:校长应善于振奋