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   

The Rise in Single-Mother Families and Children’s Cognitive Development: Evidence From Three British Birth Cohorts     

Susan Harkness  Paul Gregg  Mariña Fernández-Salgado 《Child development》2020,91(5):1762-1785

This article assessed changes in the association between single motherhood and children’s verbal cognitive ability at age-11 using data from three cohorts of British children, born in 1958 (n = 10,675), 1970 (n = 8,933) and 2000 (n = 9,989), and mediation analysis. Consistent with previous studies, direct effects were small and insignificant. For those born in 1958 and 1970 indirect effects, operating through reduced economic and parental resources, were associated with −.107-SD to −.156-SD lower attainment. Differences between the two cohorts, and by children’s age when parents separated, were insignificant. For the 2000 cohort, effect sizes for children born to single mothers did not change significantly (−.112-SD) but attenuated for children whose parents separated in early childhood (−.076-SD) or while of school age (−.054-SD).  相似文献   

Cross-Cultural Adaptation and Psychometric Properties of the Portuguese Version of the Life Skills Scale for Sport     

José Roberto Andrade do Nascimento-Junior  Leonardo de Sousa Fortes  Gabriel Lucas Morais Freire  Daniel Vicentini de Oliveira  Lenamar Fiorese  Lorcan Donal Cronin 《Measurement in physical education and exercise science》2020,24(1):11-24

ABSTRACT

This research adapted the Life Skills Scale for Sport (LSSS) into Portuguese and provided evidence for its construct validity. Study 1 included four translators and five academics who developed a Portuguese version of the LSSS (P-LSSS). During this study, evidence for the content and substantive aspects of construct validity was provided using an expert panel and 25 sports participants. Study 2 included 413 participants that completed the P-LSSS. Within this study, evidence for the structural aspect of construct validity was provided via factor analyses. Study 3 included 134 participants who completed the P-LSSS and a measure of motivation. This study provided evidence for the external aspect of construct validity, with results showing more self-determined motivation had positive relationships with participant’s life skills development. Overall, our findings provided evidence for the construct validity of P-LSSS scores. Researchers and practitioners can use the P-LSSS to assess life skills development within sports participants.  相似文献   

The Importance of Multiple Representations of Mathematical Problems: Evidence from Chinese Preservice Elementary Teachers’ Analysis of a Learning Goal     

Rui Kang  Di Liu 《International Journal of Science and Mathematics Education》2018,16(1):125-143

This article describes a study of how Chinese preservice teachers unpacked a learning goal pertaining to adding fractions and understanding the concepts underlying the operation. Based on work in the USA by Morris, Hiebert, and Spizter (Journal for Research in Mathematics Education, 40(5), 491–529, 2009), 50 Chinese preservice teachers completed a task, anticipating an ideal student response, in the context of four representations: (1) fraction pieces, (2) graph paper, (3) common denominator algorithm, and (4) pennies. Like the US-based study, this study shows that Chinese preservice teachers’ ability to unpack a learning goal was highly influenced by how the problem was represented. The pennies and graph paper problems provided more supportive contexts for unpacking the learning goal; the algorithm problem provided the least supportive context. The main difference between the preservice teachers from these two countries was the US preservice teachers chose the pennies and graph paper problems as having the most potential for revealing students’ understanding of the learning goal; while the Chinese preservice teachers chose the algorithm problem despite the problem’s unsupportive context. Chinese preservice teachers’ preference suggests that they privileged algorithmic/symbolic representations over pictorial/concrete representations. Based on our results, we argue that it is time for cross-cultural comparative research to refocus on the common barriers, challenges, and benefits as related to mathematics teacher preparation and professional development. A cooperative instead of competitive orientation will lead to richer and deeper dialogues among mathematics educators.  相似文献   

构建核心价值观与进取精神相结合的企业文化     

董谛 《襄樊职业技术学院学报》2006,5(4):138-139

当前我国越来越多的企业认识到企业文化的重要性，但要构建有特色的优秀企业文化，必须坚持核心价值观与进取精神相结合，并以持之以恒的实践精神因时因势地不断创新。  相似文献   

Parental Job Loss and Early Child Development in the Great Recession     

Gabriele Mari  Renske Keizer 《Child development》2021,92(5):1698-1716

The study examines whether and why parental job loss may stifle early child development, relying on cohort data from the population of children born in Ireland in 2007–2008 (N = 6,303) and followed around the time of the Great Recession (2008–2013). A novel approach to mediation analysis is deployed, testing expectations from models of family investment and family stress. Parental job loss exacerbates problem behavior at ages 3 and 5 (.05–.08 SDs), via the channels of parental income and maternal negative parenting. By depressing parental income, job loss also hampers children’s verbal ability at age 3 (.03 SDs). This is tied to reduced affordability of formal childcare, highlighting a policy lever that might tame the intergenerational toll of job loss.  相似文献   

Tales from three countries: reflections during COVID-19 for mathematical education in the future     

Krause  Christina M.  Di Martino  Pietro  Moschkovich  Judit N. 《Educational Studies in Mathematics》2021,108(1-2):87-104

How can school mathematics prepare citizens for a democratic society? Answers to this question are not static; they change as society and its problems change. The SARS-CoV-2 pandemic with its corresponding disease COVID-19 presents such a problem: what is needed to navigate this complex situation that involves, among other things, mathematics? Using the essay genre, we use three narratives from three countries—Italy, the USA (California), and Germany—to reflect on the goals of teaching mathematics during this crisis and examine aspects of each country’s standards for mathematics education. These three stories are framed by the authors’ backgrounds, experiences, interests, their country’s situation, and response to the pandemic. We first present the three narratives and then examine common issues across them that might provide insights beyond this current crisis, for preparing students to become active citizens. In particular, we focus on three issues: (1) developing a positive mindset toward mathematics to engage with and reflect on real-world problems, (2) improving interdisciplinary connections to the sciences to better understand how science professional practices and insights are similar or different from everyday practices, and (3) considering interpersonal and collective matters beyond the individual.

  相似文献   

指向教学空间优化的小学智慧教室的校本研究     

王迪 《天津教育》2021,(9):88-89

智慧教室的设立和运用,将大大改善学生枯燥的学习氛围,优化学生的学习形式,进一步加强学生在课堂学习中的主体地位。因此,本文结合智慧教室的教学特点,对小学信息技术学科的校本开发展开研究。  相似文献   

智能时代的信息素养:内涵、价值取向与发展路径     

吴砥  王美倩  杨金勇 《开放教育研究》2021,27(3):46-53

教育信息化的快速发展对师生信息素养提出了更高要求,师生信息素养已成为决定教育教学改革成败的关键因素.总体上,信息素养在工业时代、信息时代和智能时代表现出不同的价值内涵,并逐渐由外延式发展向内涵式发展转变.信息素养外延式发展的目标、过程、结果的外在性容易使得人的发展陷入单向度境地,在促进信息技术与教育深度融合、培养创新人才、建设教育强国的时代背景下,要实现人的全面发展,培养信息时代的合格公民,加快信息素养向内涵式发展转变至关重要.为此,我们必须树立以人为本的信息素养培育理念,尊重人的主体性地位,促进差异化、个性化发展;创新人技融合的信息素养教学方式,构建人与技术的具身关系,实现个体具身性、适应性的发展;构建生命主义取向的评价体系,采用数据驱动的评价方式,推进师生信息素养发展从外部要求向内生动力转变.  相似文献   

对《消费者权益保护法》中消费者的界定     

狄丽媛 《科技创业月刊》2007,20(2):151-152,168

消费者是指非以盈利为目的购买商品或接受服务的个人或单位。《消费者权益保护法》中的消费者应包括个人和单位。不能够以购买者的购买动机与目的为识别“生活消费”的标准,也不能以生活消费品为消费对象作为识别标准。判断购买者是否为消费者不应该从正面直接规定为生活消费需要而购买、使用商品或者接受服务,应该采用“排除法则”来断定。支付对价不是消费者的构成要件。  相似文献