Comparison of Haptic and Biometric Properties,Bacterial Load,and Student Perception of Fixative Solutions: Formaldehyde Versus Chilean Conservative Fixative Solution with and without Formaldehyde in Pig Kidneys     

Marianne Skopnik-Chicago  Katherine Poblete-Cordero  Natali Zamora  Roberto Bastías  Pablo A. Lizana 《Anatomical sciences education》2021,14(6):836-846

One of the most widely used solutions to fix and preserve organic tissues is formaldehyde, despite reservations regarding its toxicity and the fact that formaldehyde-embalmed bodies lose their original characteristics. Anatomy laboratories have been replacing formaldehyde with solutions that retain the characteristics of fresh tissue. For this purpose, alternative solutions with a very low concentration of formaldehyde or without any formaldehyde have been analyzed. The objective of this study was to compare biometry, coloration, haptic properties, and bacterial load on animal specimens (pig kidneys) embalmed with formaldehyde, and with Chilean Conservative Fixative Solution with and without formaldehyde (formaldehyde chCFS and formaldehyde-free chCFS). Also, the perception of health and biological science students toward specimens treated with different solutions was assessed. The results indicated that there were no significant differences in specimens’ retraction, or bacterial load. Students showed a preference for organs embalmed in formaldehyde chCFS and formaldehyde-free chCFS; indicating that with these treatments they could better visualize structures and that the prosections had greater flexibility and the colors were more similar to those of fresh tissue. Additionally, students recommended the material embalmed in formaldehyde chCFS and formaldehyde-free chCFS for anatomy learning. In contrast, students indicated that formaldehyde-fixation negatively affected their practical experience. In conclusion, embalming with formaldehyde chCFS or formaldehyde-free chCFS provides an advantageous practical experience over the use of formaldehyde and may be an alternative to replace the use of formaldehyde in anatomy laboratories.  相似文献   

非人灵长类模型          下载免费PDF全文

胡新天  仇子龙  顾勇  龚能  孙强 《中国科学院院刊》2016,31(7):773-782

全球有近10亿脑疾病患者,每年约带来经济负担1万亿美元。目前,绝大部分脑疾病尚无有效治疗方法。因此,脑疾病机理研究和新药开发十分迫切。由于进化上相近,非人灵长类的脑在结构、功能活动等多方面与人类高度相似。因此,相对于其他实验动物,非人灵长类具有解决人类问题,特别是脑相关问题的独特优势。它们除了是研究人类正常脑高级功能的关键实验动物外,还是最好的研究脑疾病机理和治疗方法的模型动物。中国不但有丰富的非人灵长类资源,而且在猕猴建模方面有很好的积累,尤其在转基因疾病猕猴模型创建方面,目前处于世界领先的地位。文章分析了脑疾病领域的国家战略需求,总结了国内外非人灵长类的应用情况,以及国内非人灵长类模型现状。在此基础上,对我国非人灵长类模型领域下一步发展的重点提出了建议。  相似文献   

双辽县退化草场网电围栏改良试验研究     

刘顺王波 《资源科学》1994,16(3):76-79

本文介绍了以围栏为主要手段的配套技术体系，在改良双辽县半干旱退化草场所取得的显著效果及效益，对其同类型的草场改良与建设具有实际指导意义。  相似文献   

Living well in a world with wolves: educators’ perspectives     

Gail J. Kuhl 《Environmental Education Research》2017,23(1)

  相似文献   

加强实验技能训练使之适应高职教育的需要   总被引：1，自引：0，他引：1  

孙文嘉 《辽宁高职学报》2002,4(1):56-57

实验教学是高职教育教学工作中十分的组成部分，开设实验课的目的，是为了培养生的实际工作能力，综小理论与实践的差距，强化实验技能，提高实验教学质量，培养社会需要的合格人才。  相似文献   

《计算机操作系统》教学改革探讨     

陈琳 《中国教育研究与创新》2007,4(1):5-6

计算机操作系统课程是计算机专业的核心主干课程，对操作系统课程进行教学改革具有十分重大的意义。本文在分析计算机操作系统课程内容设置、教学方法和实验手段的基础上，指出了目前操作系统教学环节中的不足之处，并针对目前操作系统教学过程中存在的问题提出了相应的改进措施。  相似文献   

汉英动物词语的文化内涵及其翻译策略     

吴汉周 《钦州学院学报》2008,23(5)

汉英民族是两个不同的民族,都有各自与众不同的文化特色。汉英动物词语文化内涵的对应关系有;完全对应;部分对应;截然不同;大相径庭;一语独有。主要原因是：生活环境不同;风俗习惯不同;对动物的认识角度不同;文化占有现象不同。主要译法：直译、意译和换译。  相似文献   

计算机网络实验室建设的研究   总被引：4，自引：0，他引：4  

潘玉奇  周劲  郑艳伟 《实验室研究与探索》2007,(12)

鉴于计算机网络实验室对计算机网络教学具有重要意义,对计算机网络实验的设置进行了探讨,重点研究了计算机网络实验室的整体架构、实验室布局,以及实验环境的搭建方案。  相似文献   

搞好实验教学 注重学生能力和素质的培养   总被引：1，自引：0，他引：1  

张玲  韦文珍 《伊犁教育学院学报》2001,14(2):76-78

搞好实验教学课教学，应注重学生能力和素质的培养。要做好实验课教学工作，首先应重视实验课教学，并在此基础上切实抓好实验课教学，在教学时注意对学生能力的培养，使实验对提高学生的综合素质发挥重要的作用。  相似文献   

Alternative Conceptions in Animal Classification Focusing on Amphibians and Reptiles: A Cross-Age Study     

Chiung-Fen?YenEmail author  Tsung-Wei?Yao  Yu-Chih?Chiu 《International Journal of Science and Mathematics Education》2004,2(2):159-174

This study examined students alternative conceptions of reptiles and amphibians and the extent to which these conceptions remain intact through the elementary (grades 4 and 6), junior, and senior high school years. We administered multiple-choice and free-response instruments to a total of 513 students and interviewed at least 20 students at each educational level to get an in-depth view of their original conceptions. Then, we developed and administered a two-tier multiple choice diagnostic instrumentto assess various levels of students understanding of amphibians and reptiles(N=1267). The results showed that most students were able to classify snakes as reptiles, whereas fewer than 30% of the students across different ages classified sea turtles as reptiles; the remaining 70% classified sea turtles as amphibians. More students were able to correctly classify frogs as amphibians than toads. In most instances, students correctly classified prototypical representatives of the two animal classes more readily than less exemplary representatives, a finding that supports previous research (Trowbridge, J.E. andMintzes, J.J. (1988). Alternative conceptions in animal classification: A cross-age study. Journal of Research in Science Teaching, 25(7), 547–571). Interestingly, the alternative views of sea turtles as amphibians remained intact throughout the school years. Interview data indicated that students classified sea turtles as amphibians largely because sea turtles are able to live in terrestrial and aquatic habitats. Semantically, amphi means living on land and in water. When asked to distinguish between reptiles and amphibians and to classify several species into those two groups, a wide range of alternative conceptions emerged and the origin of those alternative conceptions are discussed. Similar results were obtained when we applied a two-tier multiple-choice diagnostic instrument to assess students understanding of amphibians and reptiles.  相似文献