驼绒藜属三个种的核型分析

The karyotypes of 3 species of Ceratoides (C. arborescens,  C. ewersman- niana and C. latens) were studied. The results show that C. arborescens is a diploid, with karyotype formula 2n=2x=18=16m+2sm,  C. ewersmanniana is also a diploid,  with 2n=2x=18=14m+4sm,  while C. latens is a tetraploid,  with 2n=4x=36=24m+12sm. Ac- cording to the karyotypes,  the morphological features and geographical distribution,  C. arborescens seems to be a primitive species and it might have originated in northern China. C. arborescens and C. ewersmanniana are similar to each other,  not only in mor- phology but also in karyotype,  which shows that they are closely related and that C. ar- borescens might be the progenitor of C. ewersmanniana. The karyotypes of the 3 speciesof Ceratoides are basically identical,  with only minor differences.     

Effect of diet oils on lipid levels of the brain of rats

The effects of sunflower oil, olive oil, margarine, soybean oil and butter on cholesterol and triglyceride levels were investigated in the brain of rats. Rats were fed with a diet containing 15% of the oils for a period of 8 weeks. The rats were then decapitated, brain samples were removed, homogenized and cholesterol and TG levels were measured. Brain cholesterol and Triglycerides levels of all animals receiving different oils were significantly higher according to the contol except TG level of animals receiving margarine. Brain cholesterol levels of the vegetable oils were statistically higher than those receiving saturated oil. Thus, cholesterol level of the rats fed with olive oil group was significantly higher than that of the other groups but those receiving sunflower oil group and Triglycerides level of the animals receiving olive oil was significantly higher than that of the other groups except animal supplemented with soybean oil. Thus, it is concluded that brain lipid levels of rats are differently effected by various oils and mechanism of which needs to be investigated.     

簇生葱中总黄酮的提取及其含量测定

以芦丁为对照品，确定了以乙醇为溶剂的簇生葱中总黄酮的最佳提取条件，在此条件下黄酮的得率为3．98％．     

Connecting School and Home: Examining Parental and School Involvement in Readiness for College Through Multilevel SEM

Research in Higher Education - Parental involvement is widely acknowledged as a critical factor influencing the college choice process among families. What is not clear, though, is whether this...     

Designing effective,contemporary assessment on a flipped educational sciences course

ABSTRACT

Evidence shows flipped learning increases academic performance and student satisfaction. Yet, often practitioners flip instruction but keep traditional curricula and assessment. Assessment in higher education is often via written exams. But these provide limited feedback and do not ask students to put knowledge into practice. This does not support the tenets of flipped learning. For two years, the author flipped instruction but retained traditional curricula and assessment. However, on the author’s current course, all three aspects were redesigned to better support flipped learning. The aim of this research is to test the effectiveness of this redesign regarding student engagement and satisfaction. Thus, it is asked: How, on this course, can meaningful, continuous assessment be provided as well as effective, personalized feedback, while staying in line with the philosophy of flipped learning? Action research took place from September 2016 to June 2017. Quantitative data from a student survey, and qualitative data from a research diary and student focus group were gathered. What emerged is: a little-and-often assessment approach is effective for learning and engagement; tasks must be authentic and test demonstration of knowledge, not memory; quality, not quantity, is key for student learning; and students desire individualized feedback.     

盐碱地土壤全氮含量的测定

将重铬酸钾-硫酸消煮土壤样品稀释到一定体积，再吸收一定量的土壤稀释液于克氏蒸馏瓶中，通过对蒸馏时间、碱用量、稀释液体积、样品体积等因素进行对比，同时与扩散皿法进行对比，得到了分析结果误差较小的最佳条件，并对盐碱土壤种植后全氮含量进行了测定，达到了令人满意的结果．     

胡杨部分生态指标对塔里木河下游应急输水的响应

向塔里木河下游应急生态输水对于胡杨为主体的荒漠河岸植被的恢复和自然更新产生了积极的影响.本文根据近5年对塔里木河下游阿拉干地区的大量野外调查数据,分析了应急输水对该地区地下水位上升及胡杨各项生态指标的影响.结果显示:随着应急生态输水的继续和扩大.塔河下游典型监测断面--阿拉干的地下水位逐渐抬升.水质得到改善,河道附近的地下水埋深已经由输水前的10～12 m抬升至5.5～6.2 m.胡杨的部分生态指标对输水有不同程度的响应;具体表现在,在垂直河道方向上,离河道越近胡杨各项生态指标,即盖度、郁闭度、冠幅、萌生枝、树冠疏失度以及次生苗和实生苗出现的频率等对输水的响应越显著.总体来说,在河道200m范围之内,生态输水对胡杨恢复的影响程度是显著的;在200～800m之间,为中度影响;800m以上的距离几乎无影响.     

充分认识思想政治工作进学生公寓的重要性

二十一世纪,经济的多样化、生活方式的多样化、社会组织形式的多样化、就业形式的多样化必然带来人们思想观念的多样化,新时期的学生思想政治工作必须根据变化的特点有效地开展工作。如何使思想政治工作进学生公寓并发挥积极的作用,是一个全新的课题。