盐碱化草地各群落中植物种多样性的分析

自然保护已成为人类面临的重大问题之一,而自然保护的基本内容是保护生物多样性。羊草草原是松嫩平原上具有一定耐盐碱性的重要草场资源,由于过度放牧而导致让盐碱化加重,出现了植物种类组成各异的群落。盐碱化与植物多样性的关系如何,是本文研究的宗旨。本文从物种的丰富度、均匀性和多样性三个测度水平来探讨分析了物种分布格局随盐碱化梯度的变化趋势。     

高校人事档案问题、管理与思考

高校人事档案管理是一个意义深远、牵涉面广的系统工程.针对当前高校人事档案中存在的问题提出了相应的建议,以提高档案管理的效率.     

双语教学的课堂设计策略初探

本文思考了在双语教学实践中出现的一些问题,笔者认为教学中的课堂设计是解决这些问题的重要环节,本文将重点探讨实践中总结出的一些教学设计的策略,以期提高双语教学的质量和效果。     

茨威格与阿来作品中的民族意识比较——从后殖民批评理论的角度分析二者的“流放”与“寻根”

茨威格和阿来分别是犹太民族和藏民族的杰出代表,他们自身以及其作品自然的渗透出强烈的民族意识,由于作家的成长经历和时代背景,使其作品中表现出＂流放＂和＂寻根＂的后殖民批评理论的特点,因此无论是在地域、种族、文化、宗教等方面的流放,民族意识觉醒后的寻根,还是共同存在的表现各异的人道主义关怀,均是真正把握两者民族意识之间的共性和异性的咽喉。     

试析政党在加拿大联邦制演变中的角色表现

纵观加拿大历史,不难发现其联邦制是由集权性联邦向分权性联邦演变的,到了20世纪下半叶,甚至有人认为加拿大省所拥有的权力和地位,可能会令联合国许多主权国家感到羡慕,可见其省享有主权之大。而在省权扩大的历程中政党所扮演的角色不容忽视。     

比较思想政治教育研究者学养提升的四个维度

提高比较思想政治教育研究者的学养和能力,迅速完善专业学术共同体是目前最紧迫的工作。比较思想政治教育研究者要了解思想政治教育学学科发展的总体趋势;有一个相对熟悉的主攻国度;锁定自己的主攻领域或专题;有一个基本的立足点和主攻视角。     

教师经验与随机的“形式聚焦”教学技巧之关系行动研究

随机的＂形式聚焦＂是重要的教学法,因为它不仅促进人们对形式和意义的共同关注,更鼓励学生要注意语言形式。在研究教师引发的随机的＂形式聚焦＂教学技巧时,考虑教师的教育经验背景是非常重要的。通过行动研究发现,在数量和类型上,有经验的教师比没有经验的教师使用更多的随机的＂形式聚焦＂教学技巧。     

大数据对档案文献编纂工作的启示

大数据的兴起和发展,给档案实践带来了新思路和新方式。档案文献编纂因其固定的工作环节在大数据的适应上有所滞后,通过辨析大数据和档案文献编纂工作的关系,以及对大数据下档案文献编纂工作现状的探析,探讨大数据对档案文献编纂工作的启示,借助大数据实现档案文献编纂工作的过程优化,以及编纂成果多样化的目的。     

A case study of imported pulmonary coccidioidomycosis

Coccidioidomycosis is an endemic disease of the Western hemisphere. The cases in non-endemic areas are mostly imported. Determining a history of exposure is critical for performing the diagnosis of coccidioidomycosis, especially for cases occurring in a non-endemic area. In this study, a 71-year-old Chinese male presented to our hospital with chronic cough and malaise, and was found to have a mass in the middle lobe of right lung. He had been visiting Arizona, USA for four months before admission. Pulmonary coccidioidomycosis was confirmed by the results of histopathological examination after lobectomy. Typical microscopic features of Coccidioides are definitely diagnostic, but need be differentiated from other budding yeast infection or carcinoma histopathologically.     

Characterization of (68)Zn uptake, translocation, and accumulation into developing grains and young leaves of high Zn-density rice genotype

Zinc (Zn) is an essential micronutrient for humans, but Zn deficiency has become serious as equally as iron (Fe) and vitamin A deficiencies nowadays. Selection and breeding of high Zn-density crops is a suitable, cost-effective, and sustainable way to improve human health. However, the mechanism of high Zn density in rice grain is not fully understood, especially how Zn transports from soil to grains. Hydroponics experiments were carried out to compare Zn uptake and distribution in two different Zn-density rice genotypes using stable isotope technique. At seedling stage, IR68144 showed higher ⁶⁸Zn uptake and transport rate to the shoot for the short-term, but no significant difference was observed in both genotypes for the long-term. Zn in xylem sap of IR68144 was consistently higher, and IR68144 exhibited higher Zn absorption ratio than IR64 at sufficient (2.0 μmol/L) or surplus (8.0 μmol/L) Zn supply level. IR64 and IR68144 showed similar patterns of ⁶⁸Zn accumulation in new leaves at seedling stage and in developing grains at ripening stage, whereas ⁶⁸Zn in new leaves and grains of IR68144 was consistently higher. These results suggested that a rapid root-to-shoot translocation and enhanced xylem loading capacity may be the crucial processes for high Zn density in rice grains.