林业院校《高分子化学》教学改革与实践探索

课程改革与实践是提升教学质量的关键。本文针对高分子化学课程在教学过程中存在的问题进行分析,在师资队伍、教学内容的整合与优化、教学方法与手段、实践教学、考核方式等方面进行总结,结合自身教学实践,探索了体现林业院校特色的高分子化学课程教学改革,提高了教学质量。     

高职院校《导游服务技能》课程实践教学探究

《导游服务技能》课程是一门实践性强的课程,应对实践教学环节进行深入探究.本文理清了该课程实践教学的意义,并从课堂实践教学、校内实训室建设、校外实训实践三个角度对该课程的实践进行了探索,以期对我国高职院校该课程的教学实践提供借鉴和指导.     

环境监测与评价专业《仪器分析》项目化教学的实践

对环境监测与评价专业《仪器分析》课程进行基于环境监测工作情境的项目化教学改革实践,以"紫外-可见分光光度法"一章为例详细介绍课程项目化教学实践,从教学目标、教学内容、教学设计、课程考核等方面进行了探讨。     

论高职院校《会计基础》课程的教学改革与实践

近年来,高职高专院校对《会计基础》课程的教学改革与实践越来越重视.本文从课程教学理念、教学内容、教学方法、教学手段等方面分析入手,对该课程的教学改革与实践进行了探讨,以期构建更为合理的课程教学模式.     

《化工制图》课程存在的问题及对策

分析了化工制图课程教学的现状及存在问题。针对存在的问题,就化工制图课程内容、教学手段、计算机绘图和课程考试等方面进行了课程改革实践,指出:通过课程内容优化、课程实践应用、实践教学强化,及课程考核引导等过程能够有效提高课程教学效果。     

高职精细有机合成技术教学实践与探索

本文对高职精细有机合成技术课程教学内容进行了改革与实践,结合传统教学存在的弊端,重点围绕课程的特点,从教学安排、教学方法、考试评价方式、实践教学内容及项目化教学等方面进行了实践和探索,获得了期望的教学效果。     

结合卓越工程师培养,提高化学反应工程课程的教学实效

化学反应工程是化工类专业课程体系中的核心课程。课程教学中结合卓越工程师培养计划,采用多种教学方法,改以教为主为以学为主,抓住实践教学机会,将理论教学融入实践教学之中,并利用科研优势,进行了教学与科研相结合的实践,提高了本课程的教学实效。     

基于项目驱动教学的化工装备CAE技术基础课程教学改革与实践

文章通过分析现有化工装备CAE技术基础课程教学中存在的问题,根据项目驱动教学模式,将CAE理论知识与项目实践相结合,构建了以项目驱动教学为导向的化工装备CAE技术基础课程教学体系。依据“三创型”人才的培养要求,笔者立足化工机械类专业的课程定位,明确化工装备CAE技术基础课程的教学目标,并从教学内容、教学方法、教学评价体系等方面进行了教学改革与实践。基于项目驱动教学的化工装备CAE技术基础课程教学改革与实践,对于提升学生的工程实践能力和解决实际问题的能力具有重要意义。     

基于工作过程导向的《有机化工产品检验》课程改革与研究

本文根据基于工作过程导向的教改思路在有机化工产品检验课程中进行了教学探索和实践,提出了课程开发的思路和步骤,从课程内容、课程教学、课程考核三方面进行了教学改革与实践,突出学生职业能力的培养,实现学校和企业的零距离对接。     

高职表面活性剂课程项目化教学探索

课程组采用项目化教学法对传统的《表面活性剂》课程和《精细化工综合实验》的部分内容进行了整合与重构,构建了《高职表面活性剂》课程。从课程教学目的、课程设计、项目任务的布置、课程教学实施方法和教学实施效果五个方面对该课程项目化教学进行探讨与实践,取得了满意的教学效果。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、环氧树脂、不饱和聚酯树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。