水和空气的压缩实验改进

水和空气的压缩实验是一个经典对比实验。为了使实验过程更加严密,实验变量的控制更加精准,对实验进行了相应的改进:在密闭容器中借助压强的传递,使施加在注射器栓塞上的力的大小相同,从而更加科学严谨地得出相应的实验结论。     

演示实验巧改进 化学课堂显活力

通过三例演示实验的改进,使实验方法更加简单、实验现象更加明显、试验成功率更高,提高了演示实验的有效性。     

高中化学数字化实验教学思考

随着数字化时代的到来,在教育教学中,数字化技术也逐步被广泛应用。在高中化学实验教学中,讲解实验原理也开始运用数字化技术,与传统实验相比,新兴的高科技实验手段,不仅实验数据计算更加精准,实验操作更加便捷,实验效果也更加清晰、直观。新技术的支持,极大的提升了化学实验教学效果。     

小议如何应对高中化学新教材中的实验教学

一、高中化学新教材中化学实验的特点 新教材中化学实验具有明显的变化和特点,如:实验在教学中的地位更加强化;实验更富有探究性;实验更具有开放性;实验更富有趣味性;实验更加生活化;考虑学生实验安全,减少了部分有毒的或者安全性差的实验;实验更加系列化等等.     

有关“酶的催化效率”实验的改进与拓展

对人教版“酶的催化效率”实验的不足做了分析,从实验装置、实验试剂、实验步骤等方面进行了改进,使实验更加科学合理,直观有趣.适当的实验拓展有助于培养学生的实验能力、探究能力及创新能力,使教学更加高效.     

初中物理课堂演示实验的创新实践

初中物理主要以观察和实验为主。教材设计的现有实验,有时不能满足学生深度学习的需求,主要表现为:很多实验不易产生明显的实验现象;不能很好地指引学生在科学探究的过程中自主生成科学结论。为此,需要教师针对不同的科学探究,设计不同的实验,并使实验现象更加明显,指向更加明确,与学生的前认知联系也更加紧密。     

“检测生物组织中的糖类、脂肪和蛋白质”实验的改进

对"检测生物组织中的糖类、脂肪和蛋白质"实验进行改进,从实验步骤和实验材料上进行创新,使之操作更加简便合理,材料更加普遍易获,有利于该实验在课堂上的普及,且优化实验效果。     

“探究植物细胞的吸水和失水”实验的改进

从实验原理入手,对“探究植物细胞的吸水和失水”实验进行创新改进,使得整个实验的内容更加丰富、全面,实验结果更加明显,有利于提高教学课堂的质量以及培养学生的创新性思维.     

呼吸运动生理学实验微机化的探索

微机化实验系统进行呼吸运动实验，与传统的实验方法相比较，不仅 简单、易行、一次性同步完成，而且实验指标更加完善，实验结果更加理想。采用 微机化实验，将进一步加快生理学实验教学改革的步伐。     

催化加氢实验的改革及装置的改造

本文针对催化氢化实验中存在的问题进行了改进，使实验更加完整，综合性更强，锻炼了学生综合实验的能力。同时对实验装置进行了改进，使运行更加稳定，操作更加方便。     

五水硫代硫酸钠制备及热效应测试综合性实验设计

以五水硫代硫酸钠的制备及其差热分析为例,将无机化合物的制备与物性测试有机结合起来设计了综合实验项目.实验结果:实验效果良好,能够满足学生实验对重现性的要求,综合训练学生实验技能,让学生在学习无机物制备的同时掌握通过热分析探讨物质性质的方法,进一步了解五水硫代硫酸钠的脱水过程,全面提升学生的创新实践能力.     

钠熔法元素定性分析实验的探讨

本文对有机化合物元素定性分析方法钠熔法实验的异常现象进行探讨并提出解释。     

Phonological involvement in the processing of Japanese at the lexical and sentence levels

The present study examined whether Japanesereaders activate phonological information whenreading kanji compound words and sentences andif so, how they do it. Experiment 1 usedtwo-kanji compound words in a lexical decisiontask to study phonological processing at thelexical level. When nonwords werepseudo-homophones (/roR hi/ in placeof the real word /roR hi/), reactiontimes were longer and more errors occurred thanwith nonwords in the control group(/saku hi/). Experiment 2required participants to detect misspellings(i.e., incorrect kanji combinations) oftwo-kanji compound stimuli embedded insentences. In the detection task of misspelledkanji, no homophonic effect was apparent. Experiment 3 used a semantic decision task. Included in this task were semantically similarbut incorrect kanji compound words used asfillers in sentences (e.g.,meaning `The building you can see over there was facilitated by my friend' instead of designed) as well as the sentences used inExperiment 2. Results from Experiment 3indicated that participants could reject asentence as incorrect more quickly whenpseudo-homophones were embedded in thesentences rather than nonwords. These resultssuggest that readers activate phonologicalinformation of two-kanji compound words whenreading for comprehension but not for simpleproofreading.     

The effects of compound stimulus preexposure of two elements differing in salience on the acquisition of conditioned suppression

Conditioned attention theory (CAT) of latent inhibition (LI) states that parallel learning processes occur during reinforced and nonreinforced stimulus presentation. The present experiments investigated the effects of nonreinforced preexposure of either a compound CS or elements of that compound which differed in salience. Three predictions were advanced: (1) Both the compound and its elements will show an increase in LI as a function of the number of preexposures; (2) the two elements will show different levels of LI, with more LI accruing to the more salient element; (3) overshadowing will occur during compound preexposure. Two experiments, using rats as subjects and a conditioned suppression test, are reported. In Experiment 1, groups received 0, 20, 40, or 80 nonreinforced preexposures to a compound whose elements differed in salience. The results of the subsequent test confirmed predictions 1 and 2. Experiment 2, in which groups were preexposed to either the elements or the compound, provided evidence for an overshadowing effect, confirming prediction 3 from CAT.     

肥料与石膏配施对滨海盐土有效磷的影响

通过盆栽试验,研究了肥料与石膏配施条件下滨海盐土有效磷变化特征,结果表明,(1)不同肥料与石膏配施条件下,滨海盐土有效磷含量以有机无机复混肥(F2)处理较高,而以单施石膏2g/kg(F0B2)处理较低。(2)磷肥施用可显著提高滨海盐土有效磷含量,供试肥料品种间滨海盐土有效磷含量以有机无机复混肥处理(F2)、无机复混肥(F1)处理最高,其次为生物有机无机复混肥(F4)和生物有机肥(F3),以空白对照(F0)最低。(3)随石膏用量增加,土壤有效磷呈显著降低趋势。(4)滨海盐土有效磷含量存在明显动态变化特征,肥料施用后有效磷总体上呈现先增加后降低趋势,最终回复到施肥前水平。(5)从土壤有效磷角度考虑,滨海盐土肥料农业施用以有机无机复混肥(F2)较为适宜。     

元素分析实验中的碳和氢鉴定装置的改进

对有机物元素分析实验中碳和氢鉴定装置做了两方面改进：一是用铝箔包裹试样，使鉴定过程中产生的碳化物不附着（或少附着）在试管里；二是增加无水硫酸铜检验水和缓冲二氧化碳气流的装置．结果使实验损耗减小，时间缩短，现象更明显．     

大学无机化学中碱式碳酸铜制备实验的改进探索

探讨了无机化学实验中碱式碳酸铜制备的改进方法。采用CuS04和Na2CO,为原料进行制备,确定了最佳实验条件为nCuS04／nNa2C03=1：1,T=60℃,终点溶液pH=8．5,静置48h,反加（硫酸铜溶液加入到碳酸钠溶液）。通过元素分析、红外光谱分析、X—RD等手段确定了该方法制备出了高纯度的碱式碳酸铜。     

山药百合复合饮料的研制

以山药、百合为原料,研制出口感优良、营养价值较高的复合饮料。采用L9(34)正交试验法确定了最佳配方为山药汁20%,百合汁10%,白砂糖的添加量为10%,柠檬酸为0.2%的工艺配方,以海藻酸钠0.1%、羧甲基纤维素钠0.15%、黄原胶0.15%为复合稳定剂,稳定效果最佳。     

N-苯基-2，4-二氯苯胺合成与表征

以苯胺、氯乙酰氯和2,4-二氯苯酚为原利,吡啶为酰化的酸缚剂,碳酸钾为酚的缩合反应催化剂,氢氧化钠为Smiles重排反应的催化剂,在反应物料配比为n（苯胺）：n（氯乙酰氯）：n（吡啶）：n（碳酸钾）：n（氢氧化钠）=1：1．1：1．2：0．9：1．3,重排反应温度105℃．时间10h,通过酰化、缩合、重排、水解四步“一锅烩”的办法合成了N-苯基-2,4二氯苯胺．收率为60％,产物结构通过IR、NMR和元素分析进行了确认。     

Fusion expression of pedA gene to obtain biologically active pediocin PA-1 in Escherichia coli

Two heterologous expression systems using thioredoxin (trxA) as a gene fusion part in Escherichia coli were developed to produce recombinant pediocin PA-1. Pediocin PA-1 structural gene pedA was isolated from Pediococcus acidilactici PA003 by the method of polymerase chain reaction (PCR), then cloned into vector pET32a(+), and expressed as thioredoxin-PedA fusion protein in the host strain E. coli BL21 (DE3). The fusion protein was in the form of inclusion body and was refolded before purification by nickel-iminodiacetic acid (Ni-IDA) agarose resin column. Biological activity of recombinant pediocin PA-1 was analyzed after cleavage of the fusion protein by enterokinase. Agar diffusion test revealed that 512-arbitrary unit (AU) recombinant pediocin PA-1 was obtained from 1 ml culture medium of E. coli (pPA003PED1) using Listeria monocytogenes as the indicator strain. Thioredoxin-PedA fusion gene was further cloned into pET20b(+). Thioredoxin-PedA fusion protein was detected in both the periplasmic and cytoplasmic spaces. The recombinant pediocin PA-1 from the soluble fraction attained 384 AU from 1 ml culture medium of E. coli (pPA003PED2). Therefore, biologically active pediocin PA-1 could be obtained by these two hybrid gene expression methods.