• Title/Summary/Keyword: Stress adaptation

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Rice plants regenerated under saline conditions displayed salt tolerance and stress memory

  • Cho, Hyun Min;Chun, Hyun Jin;Kim, Min Chul
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2017.06a
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    • pp.152-152
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    • 2017
  • Plants exposed to environmental stress for long durations often can adapt to stress conditions with improved tolerance. Moreover this acquired tolerance to stress can be retained even after reverting to destressed growth conditions, which is known to stress memory. In these adaptation and stress memory processes, epigenetic regulation, such as DNA methylation and histone modifications play a key role. Here, we showed that regenerated rice plants from embryogenic callus exposed to gradually increasing NaCl concentrations (up to 120 mM NaCl) acquired salt tolerance and their enhanced tolerance are inherited to subsequent generations. The rice plants (R0) regenerated from rice callus under saline conditions were transplanted into normal paddy field and R1 seeds were harvested. These R1 seeds displayed higher germination rate on MS medium containing 100mM NaCl than wild-type. The callus derived from R1 seeds showed better growth than control callus on high salinity medium. And the salt-adapted R1 plants exhibited higher chlorophyll contents and also higher $K^+/Na^+$ ratio than wild-type rice under saline conditions. The results indicated that rice plants successfully adapted to saline growth conditions during regeneration on high salt medium and moreover this acquired tolerance to salt stress was inherited subsequent generation.

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Stress and Well-Being in Mothers of Children with Diabetes Mellitus : The Mediating or Moderating Effect of Optimism (당뇨아동 어머니의 스트레스와 안녕감의 관계에 미치는 낙관성의 매개 및 조절효과)

  • Kim, Dong Won;Ju, Hyeon Ok
    • Journal of Home Health Care Nursing
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    • v.24 no.2
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    • pp.160-168
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    • 2017
  • Purpose: Optimism is an important psychological variable that functions positively in stress adaptation process. The purpose of this study was to identify either a mediating or moderating effect of optimism in the relationship between stress and well-being among mothers of children with diabetes mellitus. Methods: A sample of 109 mothers of children with diabetes mellitus was recruited in a tertiary hospital in B city and they completed self-reported questionnaires. Multiple regression analysis models were used to test the mediating and moderating effects of optimism in the relationship between stress and well-being. Results: The results of the multiple and hierarchical regression analysis showed that the role of optimism was examined a partial mediator of the relation between stress and well-being, not a moderator. Increased stress was associated with decreasing optimism and well-being, and increased optimism predicted increased well-being among mothers of children with diabetes mellitus. Conclusion: Optimism is more likely to play a role as mediator, rather than as a moderator. This finding suggests the importance of optimism in improving the well-being of mothers of children with diabetes mellitus.

The Impact of Psychological Climate and Self-Resilience on Employee Performance During the COVID-19 Pandemic: An Empirical Study in Indonesia

  • SURATMAN, Andriyastuti;SUHARTINI, Suhartini;PALUPI, Majang;DIHAN, Fereshti Nurdiana;MUHLISON, Muhammad Bakr
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.5
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    • pp.1019-1029
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    • 2021
  • The study aims to investigate the impact of psychological climate, self-resilience, Organizational Citizenship Behaviour (OCB) and job stress on employee performance during Covid-19 pandemic. This paper also attempts to find out the mediating role of OCB and job stress in this context. A confirmatory survey was conducted on 316 employees of several institutions in Indonesia who worked from home during Covid-19 for a minimum period of 2 months. The research revealed that 1) PC has significant and positive influence on OCB and performance; 2) Self resilience have positive and significant influence on performance; 3) PC and self-resilience have a negative influence on job stress; 4) there are insignificant relationship between self-resilience on OCB; OCB and job stress on performance; 5) PC and self-resilience have no indirect influence on performance through OCB and job stress. The findings of this study reveal that organizations expected to have strategic approach in order to handle Covid-19 pandemic in different work patterns that are required to carry out routine office tasks from home, including handling stress as a fast adaptation for both employees and organizations that have a routine task from home.

Actor and Partner Effects of Couple's Daily Stress and Dyadic Coping on Marital Satisfaction (부부의 일상 스트레스와 공동대처가 결혼만족에 미치는 자기 효과와 상대방 효과)

  • Won, Su Kyung;Seol, Kyoung Ok
    • Journal of Korean Academy of Nursing
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    • v.50 no.6
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    • pp.813-821
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    • 2020
  • Purpose: This study aimed to identify the actor and partner effects of daily stress and dyadic coping on marital satisfaction using the Actor-Partner Interdependence Mediational Model (APIeM). Methods: Participants were 314 couples who met the study's eligibility criteria. Data were collected from March to April 2016 through apartment and cooperative company communities in Seoul. Two APIeMs of positive and negative dyadic coping were analyzed using SPSS 20.0 and Mplus 7.4. All measures were self-administered. Results: Daily stress and positive and negative dyadic coping in both spouses had direct actor effects on their marital satisfaction. Daily stress in both spouses had an indirect actor effect on marital satisfaction through their positive and negative dyadic coping. The husband's daily stress had an indirect partner effect on the wife's marital satisfaction through his positive dyadic coping, while the wife's positive dyadic coping had a direct partner effect on the husband's marital satisfaction. The husband's daily stress had an indirect partner effect on the wife's marital satisfaction through his negative dyadic coping, while the wife's negative dyadic coping had a direct partner effect on the husband's marital satisfaction. Conclusion: Dyadic coping is an effective way to deal with couple's daily hassles as it increase their satisfaction in marriage.

Effects of an Extreme Heat Adaptation Program in Hypertensive Patients (고혈압환자의 폭염 적응력 증진을 위한 프로그램 효과)

  • Jeong, Seong Hee;Kim, Nam Soon;Chae, Sumi;Lee, Eun Ju
    • Journal of Korean Biological Nursing Science
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    • v.16 no.3
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    • pp.164-172
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    • 2014
  • Purpose: The purpose of this study was to identify the effects of an extreme heat Adaptation Program on the blood pressure, stress response, self-efficacy, and knowledge of management of hypertension and extreme heat of patients who suffered from hypertension. Methods: A quasi-experimental study with a non-equivalent control group pretest-posttest design was used. The data collection period was between July 2 and August 20, 2012. Thirty-seven patients participated in the study (18 in the experimental group and 19 in the control group). Data were analyzed using $X^2$-test, t-test, and Cronbach's alpha coefficients with SPSS/WIN 19.0. Results: Patients who participated in the program showed statistically significant improvements in systolic blood pressure (SBP), self-efficacy, and knowledge of management of hypertension and extreme heat. Conclusion: The results indicate that this extreme heat adaptation program can be utilized for patients suffering from hypertension in order to reduce their SBP and to increase self-efficacy and knowledge of management of hypertension and extreme heat. Therefore, it is recommended that this program be used for elderly patients suffering from chronic disease.

An Analysis of Middle School Teachers' Teaching Profession Consciousness and Job Satisfaction by Level of their Professional Socialization (중학교 교사의 교직사회화 단계별 교직의식 및 직무만족도 분석)

  • WON, Hyo-Heon;NAM, In-Ae
    • Journal of Fisheries and Marine Sciences Education
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    • v.15 no.2
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    • pp.145-153
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    • 2003
  • The purpose of this study is to help improvements of education and effective management of school organization by grasping interrelationship between middle school teachers' job satisfaction and their teaching profession consciousness based on the different levels of professional socialization. To accomplish the purpose stated above, two questions were selected. First, how different are the middle school teachers' teaching profession consciousness according to the different levels of professional socialization? Second, how different are the middle school teachers' job satisfactions according to the levels of professional socialization. To answer these questions, a theoretical investigation into previous studies was made, and survey method was adopted for the inquiry. 500 questionnaires were given to teachers of 14 middle schools in Busan Metropolitan City, 470 questionnaires were collected. The results of the analysis may be summarized as follows: First, the teaching profession consciousness of middle school teachers show high level. Especially, there are much difference of teaching profession consciousness between the period of adaptation and maturity. Second, job satisfaction of middle school teachers show low level, and the job satisfaction points of compensations, school administrations, changes of educational environments are lower than the points of human relations, extension of profession, stress of duties. Especially, there are much difference between the period of adaptation and growth, adaptation and maturity, growth and maturity, growth and mellowness.

The Effect of Support Group Intervention on Various Adaptations of Primary Family Caregivers Caring for Cerebro-Vascular Accident Patients (집단지지 중재가 뇌졸중 환자 가족원의 제 적응에 미치는 효과)

  • Kim, Bok Lang
    • Korean Journal of Adult Nursing
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    • v.12 no.3
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    • pp.334-344
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    • 2000
  • The purpose of this research was to examine the effect of support group intervention on the various adaptations of primary family caregivers caring for Cerebro- Vascular Accident patients. The nonequivalent control group pretest-posttest design within the framework of Lazarus & Folkman's stress-adaptation model was used for this experimental study. The subjects were 86 primary family caregivers caring for Cerebro- Vascular Accident patients at K hospital in Taegu, D herbal hospital in Kyung Ju, H hospital in Pohang from March, 1998 to July, 1998. Among 86 subjects, 43 were placed in an experimental group and 43 in a control group. The experimental group was treated by researcher who administered informational and emotional support group intervention once a week over a five weeks period. The data were collected through interviews. Collected data was analized by means of a chi-square test, t-test, ANCOVA, and Pearson correlation coefficient. The results of this research were as follows: 1. Physical, emotional, and social adaptation scores in the experimental group were revealed to be significantly higher than those of the control group. 2. There was significant positive correlation among physical health, subjective burden, depression and objective burden. Accordingly, it is concluded that informational and emotional support group intervention was a useful nursing intervention on the various adaptations of primary family caregivers caring for Cerebro-Vascular Accident patients.

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A Study the Correlation between Military Service Adaptation Test and Biometric Index to prevent Military Safety Accidents (군안전사고 예방을 위한 군복무적응도 검사와 생체인식지표의 상관관계 연구)

  • Choi, Han Seon;Yun, Jong Youg;Choi, Jong Geun
    • Journal of the Korean Society of Safety
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    • v.37 no.1
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    • pp.55-63
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    • 2022
  • The correlation between the Military Service Adaptation Test and the Biometric Index is studied herein with the aim of preventing military safety accidents. The subjects were 36 soldiers under the age of 25 years. Based on the results of the service adaptation test, the soldiers who did not adapt to the service were distinguished. First, there was a significant difference in brain stress among the brain wave indicators of the general group and the group of interest. Second, the higher the left and right brain imbalance index among the brain wave indicators, the higher was the level of empathy shown by the subjects. Third, among the pulse indicators, the subjects with high cumulative fatigue levels were found to have high levels of emotion (anxiety, depression, physicalization) and relationship isolation (indifference, sensitivity). Based on these results, the implications of this study and suggestions for future research are discussed.

Astaxanthin Biosynthesis Enhanced by Reactive Oxygen Species in the Green Alga Haematococcus pluvialis

  • Kobayashi, Makio
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.8 no.6
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    • pp.322-330
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    • 2003
  • The unicellular green alga Haematococcus pluvialis has recently attracted great inter-est due to its large amounts of ketocarotenoid astaxanthin, 3,3'-dihydroxy-${\beta}$,${\beta}$-carotene-4,4'-dione, widely used commercially as a source of pigment for aquaculture. In the life cycle of H. pluvialis, astaxanthin biosynthesis is associated with a remarkable morphological change from green motile vegetative cells into red immotile cyst cells as the resting stage. In recent years we have studied this morphological process from two aspects: defining conditions governing astaxanthin biosynthesis and questioning the possible function of astaxanthin in protecting algal cells against environmental stress. Astaxanthin accumulation in cysts was induced by a variety of environmental conditions of oxidative stress caused by reactive oxygen species, intense light, drought, high salinity, and high temperature. In the adaptation to stress, abscisic acid induced by reactive oxygen species, would function as a hormone in algal morphogenesis from veget ative to cyst cells. Furthermore, measurements of both in vitro and in vivo antioxidative activities of astaxanthin clearly demonstrated that tolerance to excessive reactive oxygen species is greater in astaxanthin-rich cysts than in astaxanthin-poor cysts or astaxanthin-less vegetative cells. Therefore, reactive oxygen species are involved in the regulation of both algal morph O-genesis and carotenogenesis, and the accumulated astaxanthin in cysts can function as a protective agent against oxidative stress damage. In this study, the physiological roles of astaxanthin in stress response and cell protection are reviewed.

Effects of Different Intensities of Repeated Hypoxic Stress on Immune Functions in Mice (마우스에서 반복적 저산소 스트레스 정도에 따른 면역동성 효과)

  • 강동원;김건태;김동구
    • Toxicological Research
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    • v.15 no.1
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    • pp.27-34
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    • 1999
  • To study the nature of differentially manifested adaptive response of an organism according to the intensities of the stress, the immune effects of different levels of repeated hypoxia were investigated. Four experimental groups (NH : not -handled, 20% : handled, 15% or 10% : exposed to 15% or 10% $\textrm{O}_2$ 씨오투 with balanced nitrogen, respectively) of mice were exposed to different levels of hypoxia for 60 min/day, 5days/week in a repeated and intermittent manner. After 8 weeks' exposure to hypoxia environment, mice were subjected to immune function measurements, A decreased proportion of CD3+ CD8 phenotype cells in the study of splenocyte subsets was observed in the 10% group. Ovalbumin-stimulated IgG2a production was increased in the 15% group, while no changes were noted in the IgGl and IgM production. No significant changes of the antigen-stimulated splenocyte proliferation and the natural killer cell cytotoxicity were found. These results show that the stress effects on the immune systems can be varied according to the strength of the stress and that a mild level of repeated hypoxic stress can enhance the immune function of mice in this experimental model.

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