• Proceedings of the Korean Society of Crop Science Conference
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• 2022.10a
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• pp.157-157
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• 2022

Plants being sessile are prone to various abiotic challenges, including salinity. Plants generally cope with salt stress by regulating their endogenous NO levels. NO exogenously applied in various forms also successfully impedes the salt stress, but its small size, short half life, and high volatility rate hamper its application in agriculture. NO application via CS as a nanocarrier is an alternate option to ensure the optimal kinetic release of NO for a long period compared to the free NO form. Herein, we synthesized and characterized GSNO-CS NP by ionic gelation of TPP with CS and then reacting with GSH, followed by reaction with NaNO₂ suspension. The synthesized NPs were characterized using non-destructive analytical techniques such as DLS, FTIR, and SEM to ensure their synthesis and surface morphology. NO-release profile confirmed optimal kinetic NO release for 24 h from NO-CS NP as compared to free NO form. The efficiency of NO-CS NP was checked on Arabidopsis plants under salinity stress by gauging the morphological, physiological, and enzymatic antioxidant system and SOS pathway gene expression levels. Overall, the results revealed that NO-CS NP successfully mitigates salinity stress compared to free GSNO. Concluding, the findings provide sufficient experimental evidence for the application of nanotechnology to enhance NO delivery, thus inducing more benefits for the plants under stress conditions by mitigating the deleterious impacts of salt stress on the morphological and physiological status of the plants, and regulating the ions exchange by overexpression of SOS pathway candidate genes.

• Journal of The Korean Society of Grassland and Forage Science
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• v.42 no.2
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• pp.120-126
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• 2022

The objective of this study was to determine effects of phosphorus on lignification and carbohydrate metabolism in Kentucky bluegrass under drought stress. Drought stress was induced by reducing of water to plants in pots. Two types of phosphorus were applied as potassium phosphate (PO₄^3-; P) or potassium phosphonate (PO₃^3-; PA) in drought-stressed plants. Drought had significant negative effects on plant growth, as revealed by reduced biomass of shoot. Drought-induced increase of lignin content was concomitant with the increase of phenylalanine ammonia-lyase (PAL). Soluble sugar content was highly increased but fructan content was largely decreased by drought stress. However, the application of phosphorus was efficient to ameliorate the adverse effects of drought. PA application improved reduced shoot growth and relative water content, and inhibited lignification synthesis with a reduction of PAL activity. P or PA application maintained soluble sugar and fructan content at similar levels to controls under drought stress. These results indicate that phosphorus application may mitigate the drought stress by inhibiting the lignification and promoting the fructan assimilation.

• Journal of Microbiology and Biotechnology
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• v.21 no.8
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• pp.830-837
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• 2011

A genomic DNA fragment encoding a putative maltooligosyltrehalose trehalohydrolase (NfMTH) for trehalose biosynthesis was cloned by the degenerate primer- PCR from cyanobacterium Nostoc flagelliforme. The ORF of NfMTH is 1,848 bp in length and encodes 615 amino acid residues, constituting a 70 kDa protein. The deduced amino acid sequence of NfMTH contains 4 regions highly conserved for MTHs. By expression of NfMTH in E. coli, the function of this protein was demonstrated, where the recombinant protein catalyzed the hydrolysis of maltooligosyl trehalose to trehalose. The expressions of MTH and maltooligosyltrehalose synthase in the filaments of N. flagelliforme were upregulated significantly under dehydration stress, NaCl stress, and high temperature-drought stress. The accumulations of both trehalose and sucrose in the filaments of N. flagelliforme were also improved significantly under the above stresses. Furthermore, trehalose accumulated in smaller quantities than sucrose did when under NaCl stress, but accumulated in higher quantities than sucrose did when under temperature-drought stress, indicating that both trehalose and sucrose were involved in N. flagelliforme adapted to stresses and different strategies conducted in response to various stress conditions.

• Journal of Korean society of Dental Hygiene
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• v.18 no.5
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• pp.797-806
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• 2018

Objectives: The purpose of this study was to analyze Influence of stress on oral health and quality of life. Methods: The participants were 172 students from 4 universities located in DaeJeon, South Korea. A questionnaire was administered, assessing the impacts of the general characteristics of the participants, temporomandibular joint (TMJ) symptoms, xerostomia, and halitosis on stress. And oral impacts on daily performance were also investigated. Data were analyzed using the Statistical Package for the Social Sciences 18.0. Results: The level of stress was higher in female, and the causes of stress was reported scholastic achievement, relations with professors, get a job. The students who were higher stress were more conscious of TMJ symptoms, xerostomia and halitosis(p<0.05). Stress was significantly positively correlated with TMJ symptoms (r=0.376, p<0.001), dry mouth (r=0.360, p<0.001), and bad breath (r=0.343, p<0.001). Oral Impacts on Daily Performance (OIDP) scores were significantly positively correlated with dry mouth, bad breath, TMJ symptoms, and stress. Regression analysis showed that 54.5% of the independent variables were related to OIDP scores. Stress and TMJ symptoms exerted a significant effect on OIDP scores. Conclusions: Stress among university students affects oral health and quality of life. Stress coping mechanisms and oral health care education programs should be developed and applied at universities.

• Journal of muscle and joint health
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• v.13 no.1
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• pp.20-30
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• 2006

Purpose: To determine the effect of Tai Chi exercise program on fatigue, stress, and quality of life in middle aged women. Method: The study was designed as a nonequivalent control group pretest-posttest quasi-experimental study. Thirty subjects were assigned for experimental group and thirty four subjects were assigned for control group. The subjects in the experimental group were participated in Tai Chi exercise program for 60 minutes per session 3 times a week for 8weeks. Tai Chi exercise program consists of 10 minutes warm-up, 45 minutes main, and 5 minutes cooling down exercises. In order to evaluate the effect of Tai Chi exercise program, fatigue, stress, and qualify of life were assessed by measuring the condition of the participants in respect of fatigue, stress, and qualify of life with questionnaire. The data were analyzed by using $x^2-test$, Fisher's exact test, t-test by a SAS-pc+ 8.12 program. Result: After 8 weeks Tai Chi exercise program, there were significant improvement in fatigue, stress, and quality of life in middle aged women. Conclusion: Tai Chi exercise program can be an effective nursing intervention to improve fatigue, stress, and quality of life in middle aged women.

• Proceedings of the Korean Society of Plant Pathology Conference
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• 2005.10a
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• pp.31-32
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• 2005

• Journal of muscle and joint health
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• v.21 no.2
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• pp.125-134
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• 2014

Purpose: The purpose of this study was to identify factors associated with quality of life of nursing students during clinical practice. Methods: A convenience sample of 332 nursing students completed the questionnaire from July to September, 2013. A self-reported questionnaire was used to obtain data on quality of life, stress related to clinical practice, and health promotion behavior. Data was analyzed with independent t-test, one way ANOVA and Scheff${\acute{e}}$'s post hoc test, Pearson correlation coefficients, and hierarchical multiple regression by using SPSS version 20.0. Results: There were significant differences in quality of life scores by age, economic status, interpersonal relationships, daytime somnolence, number of visits in pharmacy and/or healthcare center, health status, and stress management. Quality of life had positive correlation with health promotion behavior but had negative correlation with the level of stress related to clinical practice. Models including these variables explained 34.3% (F=9.77, p<.001) of the variance for quality of life. Age, economic status, sleep amount, numbers of pharmacy/hospital visits, health status, stress during clinical practice, and health promotion behavior were significantly associated with quality of life in nursing students. Conclusion: There is a need to develop and implement new strategies that will result in improvement in nursing students' quality of life.

• Journal of the Korea Furniture Society
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• v.23 no.2
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• pp.214-221
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• 2012

Sustainable energy consumption and increasing $CO_2$ emissions stimulate Eco-friendly industry. Wood has positive various properties as alternative energy such as solar, wind and water. Wood provide lumber, pallet, paper, pulp and fuel through production process. Even Korea republic has 63.7% of forest rates, weather condition makes low forestry production capacity. For utilization of domestic small diameter log needs study mechanical properties. In this study, various properties tested on domestic Japanese Larch small diameter lumbers and make mechanical properties table for allowable stress calculation. Result of compressive test, allowable compressive stress is 13 MPa. Allowable bending stress is 12 MPa.

• Journal of Digital Convergence
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• v.16 no.2
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• pp.269-276
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• 2018

The purpose of this study was to investigate the relationship between Grit and stress and college adjustment of nursing college students and to confirm the effect of nursing students' adaptation to college life. The study subjects were 145 students who agreed to participate in this study after completing at least one semester of clinical practice. The collected data were analyzed by SPSS 23.0 program using descriptive statistics, Pearson's correlation, Multiple regression analysis. There was a significant positive correlation between college life adaptation and grit (r=.17, p=.047) and a negative correlation between stress and university life (r=-.31, p<.001). Grit and stress had an explanatory power of 11.2% on adaptation to college life(F=9.98, p<.001). The results of this study suggest that it is necessary to improve nursing students' Grit level and to develop effective stress management programs for their adaptation to college life.

• Journal of Digital Convergence
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• v.18 no.4
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• pp.461-467
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• 2020

The purpose of this paper was to investigate the relationships among college students' life stress, self-efficacy, locus of control, and subjective well-being. A total of 279 college students participated in this study. It was administered a questionnaire consisting of questioned of concerning life stress, self-efficacy, locus of control, and subjective well-being. The correlation analysis and the analysis of mediating effect were conducted on the data. The main results of data analysis showed (1) correlations among life stress, self-efficacy, locus of control, and subjective well-being, (2) significant mediating effect of self-efficacy between life stress and subjective well-being. The direction of a further study was suggested.