固态继电器在全新风机组中的应用

本文介绍了应用固态继电器及可编程逻辑控制器实现的控制全新风空调机组送风温度的方法。使用这种方法设计的空调机控制系统在有效控制机组的送风温度的同时大大节约了生产成本。     

遗传学实验中SSR标记的应用实践

该实验是科研成果转化为实验教学设计的一个成功案例,建立了植物DNA指纹检测和父本鉴定技术。通过本实验,学生可以掌握PCR技术、DNA提取和电泳检测等实验技术,巩固关于基因位点／等位基因、纯合体／杂合体、二倍体／三倍体、孟德尔遗传规律和DNA指纹图谱等多个（对）重要的遗传学概念,提高学生学习遗传学的兴趣。     

污泥比阻实验设备的改造

介绍了改造的污泥比阻实验设备的组成结构,对该设备的改造目的及主要原理进行了阐述,通过实验结果表明,经过改造重新制作的污泥比阻实验设备具有启动容易、使用操作方便的特点,完全能满足水处理实验技术的要求.     

福建省家鸭地方品种的亲缘关系分析

利用SSR技术分析福建省家鸭地方良种金定鸭、山麻鸭、连城白鸭和野鸭绿头鸭、斑嘴鸭基因组DNA的多态性,在21个位点共扩增得到421条带,其中多态性条带213条,约占总数的50.6%.多态性位点比率在33.3%~84.6%之间.运用简单匹配系数法计算了品种(系)间的相似性系数和遗传距离,家鸭品种间的遗传距离在0.043~0.251范围内,绿头鸭、斑嘴鸭与家鸭品种(系)间的遗传距离分别在0.203(金定鸭Ⅰ系)~0.232(金定鸭Ⅱ系)和0.236(山麻鸭)~0.317(金定鸭Ⅱ系)范围内.连城白鸭与金定鸭3个品系间的遗传距离介于0.232至0.251之间,山麻鸭与金定鸭3品系间的遗传距离在0.239至0.248范围内,而连城白鸭与山麻鸭间的遗传距离为0.136.yh     

Ar+注入小麦M3代变异的SSR鉴定及再分离研究

用Ar＋注入小麦花培5号的干种子。结果表明,M1代的生育期和农艺性状与对照差异不显著。M2代出现株高、穗长变异,变异率为0.2%,10个变异株经SSR鉴定,90对引物中有6对能扩增出特异带,突变点分别发生在2A、2D、3B、5A染色体上。10个变异株的M3代均发生严重的正向或负向分离,有利于筛选到特殊变异类型。     

The Value of Reading and the Effectiveness of Sustained Silent Reading

In this article, we explore the association between students’ value of reading and their behavior during a sustained silent reading (SSR) period, and their attitudes toward SSR and reading leisure books. 362 secondary students participated in this study and data were collected by means of a questionnaire. The results showed that more students in the high value of reading (HVR) group behaved better during SSR periods and had a more positive attitude toward SSR and leisure book reading than those in the lower value of reading (LVR) group. The value of reading was also found to be associated with the frequency of interaction with parents in reading activities, and we thus suggest that parents should be involved in the SSR program.     

Extraction of DNA suitable for PCR applications from mature leaves of Mangifera indica L.

Good quality deoxyribonucleic acid (DNA) is the pre-requisite for its downstream applications. The presence of high concentrations of polysaccharides, polyphenols, proteins, and other secondary me- tabolites in mango leaves poses problem in getting good quality DNA fit for polymerase chain reaction (PCR) applications. The problem is exacerbated when DNA is extracted from mature mango leaves. A reliable and modified protocol based on the cetyl- trimethylammonium bromide (CTAB) method for DNA extraction from mature mango leaves is described here. High concentrations of inert salt were used to remove polysaccharides; Polyvinylpyrrolidone (PVP) and β-mercaptoethanol were employed to manage phenolic compounds. Extended chloroform-isoamyl alcohol treatment followed by RNase treatment yielded 950?1050 μg of good quality DNA, free of protein and RNA. The problems of DNA degradation,contamination, and low yield due to irreversible binding of phenolic compounds and coprecipitation of polysaccharides with DNA were avoided by this method. The DNA isolated by the modified method showed good PCR amplification using simple se- quence repeat (SSR) primers. This modified protocol can also be used to extract DNA from other woody plants having similar problems.     

混凝剂在煤泥水处理中的研究

混凝剂的选择是煤泥水处理中最重要的环节,它直接影响着煤泥水的处理效果.混凝剂可以分为无机凝聚剂和有机絮凝剂.本试验以上清液浊度、浑液面沉速和污泥比阻为衡量标准比较了单独使用无机凝聚剂、单独使用有机絮凝剂和联合使用无机凝聚剂与有机絮凝剂三种方法的处理效果.试验数据表明:处理高浓度煤泥水,后两种方法能达到理想的处理效果,并得出了后两种方法的最佳投药量.     

《小学语文课程与教学论》教学改革研究——以SSR教学模式为例

SSR教学模式的实施,为高等师范院校的教学构建了自主、开放而赋有生命力的课堂。独立学习策略、讨论学习策略、探究学习策略是实施SSR教学模式的较好载体。大连大学师范学院将SSR教学模式应用到《小学语文课程与教学论》教学中,取得了显著的成绩,为师范院校的课堂教学改革探索了一条既切实可行又卓有成效的途径。