油菜素内酯对硝酸钙胁迫下黄瓜幼苗抗氧化系统及可溶性蛋白表达的影响     

李雅洁  张其安  陆晓民 《安徽科技学院学报》2017,31(1)

目的:研究硝酸钙胁迫下24-表油菜素内酯(EBR)对黄瓜幼苗抗氧化性能及可溶性蛋白表达的影响。方法:通过单因素随机区组设计,从其抗氧化性能及可溶性蛋白表达的变化来探讨EBR对硝酸钙胁迫下黄瓜幼苗的影响。结果:与对照相比,硝酸钙胁迫导致黄瓜幼苗的丙二醛含量及细胞膜透性显著提高了115.1%和105.6%,膜脂过氧化加剧,黄瓜根系中可溶性蛋白含量降低且至少有35种蛋白发生明显变化,而叶片的可溶性蛋白含量升高且至少有29种蛋白发生明显变化;而硝酸钙胁迫下喷施EBR后黄瓜幼苗的SOD、POD、CAT分别比单纯的硝酸钙胁迫增加了20.2%、20.3%、34.4%,并提高了其可溶性蛋白含量及其表达的变化幅度。结论:24-表油菜素内酯可通过调节硝酸钙胁迫下黄瓜幼苗抗氧化性、可溶性蛋白含量及其表达,进而降低其膜脂过氧化程度,以缓解硝酸钙胁迫对植株的伤害。  相似文献   

汽轮发电机基座底板大体积混凝土温控技术     

柯明军 《茂名学院学报》2002,12(1):49-51

茂名电厂5#机汽轮发电机基座底板为大体积混凝土，为确保混凝土质量，需要对混凝土进行温度控制，在施工过程中，通过采取合理施工工艺以及采取有效的温控措施，混凝土没有出现温度裂缝，确保5#汽机施工质量。  相似文献   

阳离子高分子SOP的性能研究初探     

周芳霞  田春良 《湖南科技学院学报》2006,27(11):200-202

用溶液法合成阳离子高分子SCP，简略介绍了其制备方法；对SCP的性能做了一系列测定：用特性粘度法测定了SCP的分子量，其范围在30万-50万；对其水溶液的粘度、Zeta电位、电导率、表面张力以及水分散体系中阳离子高分子微粒的粒径分布进行了研究。发现这种水溶性阳离子高分子具有很好的抗盐性。  相似文献   

教师职业倦怠与教师的心理健康教育   总被引：22，自引：0，他引：22  

林文瑞 《福建师范大学学报(哲学社会科学版)》2004,(6):135-139

文章探讨了教师职业倦怠对教师心理健康的影响 ,并进一步阐述了引发教师职业倦怠的压力源 ,在此基础上提出若干建议以供教师心理健康教育参考。  相似文献   

Stress and coping in primary caregivers of children with a disability: a qualitative study using the Lazarus and Folkman Process Model of Coping     

Tara  Kelso  Dr  Davina French  Miguel  Fernandez 《Journal of Research in Special Educational Needs》2005,5(1):3-10

Twenty-six primary caregivers of children with a disability took part in focus groups or interviews to discuss their perceptions of stress and the coping process. Research was framed within the Process Model of Stress and Coping ( Lazarus & Folkman, 1984 ). Findings provided a snapshot of the common stresses encountered by caregivers and indicate the need to consider individual experiences when determining the impact of stressful events. Eight common stressors were identified, as well as novel constructions of stressful experiences. Results suggested that a range of coping resources and strategies were employed. The study also indicated that the majority of participants adapted well to the requirements of raising a child with a disability. The current study indicates the value of using qualitative methods, particularly with unique populations, to inform policy and service provision.  相似文献   

Challenge and hindrance stress among schoolteachers          下载免费PDF全文

Barbara Stiglbauer  Julia Zuber 《Psychology in the schools》2018,55(6):707-721

The challenge–hindrance stress framework argues that certain job stressors have entirely detrimental effects (hindrance stress), but some may also have beneficial effects (challenge stress). Though the challenge–hindrance framework has largely been neglected in teacher stress research, we adopted it to provide a more differentiated view of the most prominent stressors in the teaching profession. We asked a sample of 528 secondary schoolteachers to report the extent to which they perceived occupation‐specific stressors as motivating (challenge stress) and burdening (hindrance stress). Most stressors (those associated with sociopolitical pressure, students’ misbehavior, and lack of resources) were seen as a hindrance rather than a challenge. Only stressors associated with expanded job scope seem to have had more challenge than hindrance potential. Teachers’ hindrance (but not challenge) stress in turn was a strong predictor of psychophysiological symptoms. Importantly, hindrance stress was highest and also the most significant predictor of psychophysiological symptoms if it arose from sociopolitical pressure. In sum, the results indicate that the challenge–hindrance framework might serve as a useful theoretical background in the field of teacher stress research and could offer another explanation for the poor health reported by this occupational group.  相似文献   

运动作为重要应激原诱发骨骼肌细胞凋亡的研究进展     

王勇  罗剑 《三明学院学报》2007,24(2):214-218

对近年来大量的文献研究,运动训练是人体的重要的应激源,在运动应激下会诱发骨骼肌细胞的凋亡,并且随着运动形式与强度等改变而改变。骨骼肌中的细胞凋亡与运动能力的下降有着密切的联系,这有可能是诱发运动性疲劳的机制之一。因此,研究运动训练与细胞凋亡的关系及运动导致骨骼肌细胞凋亡的机制意义重大。运动可以诱导骨骼肌细胞凋亡,细胞凋亡发生的比率和程度与运动形式、运动强度和运动持续时间密切有关。这些问题的研究对于预防和处理运动导致的骨骼肌损伤以及缓解运动性疲劳、提高运动成绩提供了理论指导。  相似文献   

浅述获得健康长寿的方法     

张立争  尚君 《北京城市学院学报》2007,(3):75-77

要获得健康长寿,应该从健康的生活方式着手。本文对戒烟和限量饮酒、合理的膳食营养、适量的体育锻炼等方面进行了阐述,并对如何参加体育锻炼做了具体的说明。  相似文献   

盐胁迫下野大豆无机离子分布的研究     

王丽燕  张红 《德州学院学报》2004,20(2):67-70

用不同浓度的NaCl溶液处理野大豆幼苗后,测定并比较根及地上部的Na 、Cl-、K 含量.地上部及根部的Na 、Cl-含量随盐度的增加而升高,且累积趋势相似.盐胁迫下根部的Na 、Cl-含量明显高于地上部,说明盐生野大豆在盐胁迫下以根部优先积累盐离子为其适应特征.地上部及根部的K 含量随盐度的增加而降低.  相似文献   

‘There’s stuff that comes with being an unexpected guest’: experiences of trans* academics with microaggressions     

Erich N. Pitcher 《International journal of qualitative studies in education》2017,30(7):688-703

Historically, minority stress theory focused on the experiences of ‘sexual minorities;’ this study extends minority stress theory to understand the unique stressors that trans* individuals face in academic workplaces. Using interview data from 10 trans* college and university faculty, I fill a noted gap in the literature and examined the unique stressors that these faculty faced within the academy. In this study, microaggressions, a kind of minoritized stress, included: (mis)recognition, including misgendering and mispronouning, being an impossible person, and tokenization. Additionally, trans* faculty reported strategies to resist these stressors. These findings suggest that trans* academics navigate hostile academic work environments and experience minoritized stress deriving from their minoritized gender identities. Implications for research indicate that addressing the personal and professional consequences of minoritized stressors is an important step in understanding how microaggressions affect trans* academics. Implications for practice include the need for rethinking cisnormative assumptions within academe.  相似文献