A person-centered approach to achievement goal orientations in competitive tennis players: Associations with motivation and mental toughness     

Richard Gregory Cowden  Nicolas Mascret  Timothy Ryan Duckett 《运动与健康科学(英文)》2021,10(1):73

BackgroundResearch on achievement goal orientations in sport has typically relied on the use of variable-centered approaches that tend to overlook population heterogeneity. In this study, we used a person-centered approach to identify subgroups of competitive tennis players according to unique combinations of achievement goal orientations and tested for subgroup differences in motivation and mental toughness.MethodsA sample of 323 competitive tennis athletes (69.35% male) between 15 and 25 years of age (17.60 ± 2.40 years, mean ± SD) completed the 3 × 2 Achievement Goal Questionnaire for Sport, Sport Motivation Scale II, and Mental Toughness Index. Latent profile analysis was used to identify unique combinations of achievement goal orientations. Comparisons between latent subgroups on autonomous motivation, controlled motivation, and mental toughness were performed using analysis of variance.ResultsLatent profile analysis supported 3 distinct patterns of achievement goal profiles that were primarily distinguishable based on valence of competence (i.e., approach vs. avoidance). Analyses of variance indicated that athletes who were classified into subgroups that endorsed approach types of goals (regardless of the types of avoidance goals they endorsed) reported higher levels of autonomous motivation and mental toughness.ConclusionResults indicated that athletes tend to pursue a number of achievement goals collectively rather than in isolation. Although approach goals are more commonly linked to adaptive psychological functioning and positive outcomes, avoidance goals may also be associated with desirable psychological characteristics if they are pursued in conjunction with approach types of achievement goals.  相似文献   

Development of a chemically defined medium for Planctopirus limnophila to increase biomass production     

《Electronic Journal of Biotechnology》2021

BackgroundPlanctomycetes is a phylum of biofilm-forming bacteria with numerous biosynthetic gene clusters, offering a promising source of new bioactive secondary metabolites. However, the current generation of chemically defined media achieves only low biomass yields, hindering research on these species. We therefore developed a chemically defined medium for the model organism Planctopirus limnophila to increase biomass production.ResultsWe found that P. limnophila grows best with a 10 mM sodium phosphate buffer. The replacement of complex nitrogen sources with defined amino acid solutions did not inhibit growth. Screening for vitamin requirements revealed that only cyanocobalamin (B12) is needed for growth. We used response surface methodology to optimize the medium, resulting in concentrations of 10 g/L glucose, 34 mL/L Hutner’s basal salts, 23.18 mM KNO₃, 2.318 mM NH₄Cl and 0.02 mg/L cyanocobalamin. The analysis of amino acid consumption allowed us to develop a customized amino acid solution lacking six of the amino acids present in Aminoplasmal 10%. Fed-batch cultivation in a bioreactor using the optimized medium achieved a final ΔOD₆₀₀ of 46.8 ± 0.5 after 108 h, corresponding to a cell dry weight of 13.6 ± 0.7 g/L.ConclusionsThe optimized chemically defined medium allowed us to produce larger amounts of biomass more quickly than reported in earlier studies. Further research should focus on triggering P. limnophila biofilm formation to activate the gene clusters responsible for secondary metabolism.How to cite: Kruppa OC, Gerlach D, Fan R, et al. Development of a chemically defined medium for Planctopirus limnophila to increase biomass production. Electron J Biotechnol 2021;54. https://doi.org/10.1016/j.ejbt.2021.09.002.  相似文献   

大学生涉跑猝死事件的体医融合防卫机制研究     

洪邦辉  胡庆山  张恒波  向彪 《武汉体育学院学报》2020,54(2):32-36,58

近年来，大学生身体素质不佳，已成为"老大难"，也是刻不容缓需要解决的问题，多地曾出现在体测、运动会、马拉松中晕倒甚至猝死事件，这给学校体育工作的开展带来不小的考验。带着因涉跑引起猝死的疑问，通过猝死案例分析，探究高校大学生猝死的病理学的非运动成因。研究认为：涉跑猝死的主因是先天性生理疾病，运动不是引发猝死的主要诱因，并提出了预防运动猝死的"堵疏结合"的医学监控策略和体医融合防卫机制构建方法。建议通过入校时医学筛查、跑前医学检查、跑中医学观察、猝死现场急救、跑后跟踪复查降低猝死风险；建立宿舍、运动场地、运动项目的全覆盖的心脏复苏志愿队伍，实施"黄金8分钟"内的急救生存链；建立学生、学校、政府、社会四方体育运动分级分类保险制度，从风险转移和人道主义援助进行关怀；建立涉跑猝死、猝死、非正常死亡的数据库，开展非正常死亡人员的病理学研究；建立全生命周期医学监控和健康安全宣传教育，形成全方位、全过程、全人员的体医融合防卫机制。  相似文献   

打造“中药鉴定学”线上线下混合式金课之研究     

陆叶  刘春宇  陈重  吴文倩  陈晶磊  陈韶华 《教育教学论坛》2020,(17):204-205

金课这一概念是我国教育部陈宝生部长提出的,目的是切实提高我国高校本科教育的教学质量。国家在着力打造五类金课:线下金课、线上金课、线上和线下混合式金课、虚拟仿真金课和社会实践金课。本着老师"教得好"、学生"学得好"的原则,该文旨在探讨如何打造中药鉴定学线上线下混合式金课、精心培养卓越的中药鉴定复合型人才。  相似文献   

Surviving Being Dark: A Pedagogy of the Sacred for Survival in a Divided Society     

Karen E. Mosby 《Religious education (Chicago, Ill.)》2020,115(3):304-314

Abstract

Historically, Blacks have out of necessity prioritized survival in educating their younger generations for existence in the racially hostile and divided context of the U.S. This education and religious education has occurred formally and informally in homes, schools, community organizations, and in congregations. This paper examines three aspects of survival: survival and emancipatory education, survival and justice, and survival with emerging Black generations. Three examples will be offered that highlight each aspect of survival. The examples will demonstrate how education generally and religious education in particular have undergirded pedagogies of the sacred for the survival of Black life.  相似文献   

Sum of squares of deviations     

Josef Bukac  Jakub Sulc 《Teaching Statistics》2020,42(1):30-31

The question is whether or not we or any student are allowed to define a measure of variability in some other way that is not written in textbooks and officially approved. We compare the sum of squares of all deviations against the usual sum of squares of deviations from the mean.  相似文献   

国外体育创新创业研究的前沿热点与发展启示——基于Web Of Science的文献计量分析     

唐元超  许建  蒋东升  陈政天 《浙江体育科学》2020,(3):8-14,108

为更好地了解国外体育创新创业领域研究的前沿热点和发展趋势,明晰我国发展的不足。运用文献计量法、数理统计法等对1968—2018年Web Of Science(SSCI、SCI等核心库)中的收录的123篇文献进行了计量分析。结果表明:国外体育创新创业领域已取得一定的成果,但也仍存在作者合作脉络单一、实证研究单薄、案例分析不够全面等问题,建议国内应取长补短,从巩固理论研究、深入实证研究、加强协作脉络、延伸企业家精神内涵等方面入手,以期更好地促进我国体育创新创业领域的发展。  相似文献   

2018年世锦赛中日集体花球啦啦操成套创编比较研究     

刘秋蝶  盛小苗 《体育科技文献通报》2020,(6):147-148,163

本文采用文献资料法,视频分析法,专家访谈法,比较分析法和数理统计法等研究方法。对2018年世锦赛中日集体花球啦啦操成套创编进行比较研究,包括三大技术技巧难度(跳步、转体、柔韧与平衡)、连接难度(集体类、技巧类、层次等)、托举与配合(托举、配合)、基本手位等。力图对这些进行定量对比分析、探究,分析中日两国成套动作差异等,以期为国内成套花球舞蹈啦啦队练习的创作和编写提供参考。  相似文献   

新时代高校专业课教师的政治责任     

李庆梅  何玉安 《教育教学论坛》2020,(14):24-26

习近平总书记在全国高校思想政治工作会议上的讲话中明确了我国高校教师的政治责任。高校专业课教师在履行好教学责任的同时也必须履行好政治责任,除了从制度上激励、支持、保证专业课教师履行好政治责任外,专业课教师还应当充分发挥自身优势,实现“立德树人”的工作总目标。  相似文献   

Study Abroad Experience and Career Decision-Making: A Qualitative Study of Chinese Students     

WU Yihan 《Frontiers of Education in China》2020,15(2):313

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