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Kim, Hyoil;Kim, Yonggyun
- Korean journal of applied entomology
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- v.58 no.2
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- pp.101-109
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- 2019
An entomopathogenic bacterium, Xenorhabdus ehlersii KSY, is symbiotic to a nematode, Steinernema longicaudum, and exhibits high entomopathogenic virulence against lepidopteran insects. This study showed that the bacterial pathogenicity is induced by its inhibitory activity against eicosanoid biosynthesis of target insects, resulting in immunosuppression. To be applied for insect pest control, the bacteria should be infected to insect hemocoel. To deliver X. ehlersii to inset hemocoel, Bacillus thuringiensis (Bt) was mixed with the bacteria to breakdown the physical barrier (= midgut epithelium) from midgut lumen to hemocoel. The bacterial mixture significantly enhanced insecticidal activity of Bt only against larvae of Plutella xylostella and Maruca vitrata. For formulation, X. ehlersii cells were freeze-dried and mixed with sporulated Bt cells. The formulated bacterial mixture was applied to semi-field cultivating cabbage crop infested by P. xylostella. The bacterial mixture treatment showed over 95% control efficacy, while Bt alone gave 80% control efficacy. These results suggest that X. ehlersii can be applied to develop a novel insect control agent.
https://doi.org/10.5656/KSAE.2019.04.0.017 인용 PDF KSCI HTML

Park, Jummi;Shin, Nayeon
- Journal of the Korea Convergence Society
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- v.10 no.4
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- pp.277-284
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- 2019
Purpose: The purpose of this study is to examine the relationships among job stress, resilience and turn over intention of new graduate nurses in general hospital. Methods: A descriptive regression design was used and the participants were 90 new graduate nurses from one general hospital in S city. Data analysis included t-test, ANOVA, pearson's correlation and multiple regression. Results: There were significant correlations between conflict with physicians(r=.17, p=.049), problem relating to supervisors(r=.18, p=.040), discrimination(r=.18, p=.041), resilience(r=-.21, p=.023) and turnover intention. The regression model explained approximately 24.5 % of turnover intention. Conclusion: The findings suggest that nursing leaders have to reduce job stress and to improve resilience of new graduate nurses.
https://doi.org/10.15207/JKCS.2019.10.4.277 인용 PDF KSCI HTML

Soo Min Lee;Jin Ju Lee;Yong Ho Choi;Hun Kim;Gyung Ja Choi
- Research in Plant Disease
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- v.29 no.2
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- pp.158-167
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- 2023
Black rot of Chinese cabbage caused by Xanthomonas campestris pv. campestris (Xcc) is one of the most severe diseases in crop cultivation. To define the resistance characteristics of Chinese cabbage to Xcc, we tested the virulence of eight Xcc isolates in four susceptible cultivars of Chinese cabbage. The isolates of Xcc showed different the virulence on the cultivars. On the other hand, we selected 22 resistant or moderately resistant cultivars of Chinese cabbage to Xcc and tested the occurrence of black rot on the cultivars caused by the isolates of Xcc. Mean disease severity of black rot on the Chinese cabbage caused by each isolate was also positively correlated with the virulence of Xcc isolates. Furthermore, the development of black rot in each cultivar increased according to virulence of Xcc isolates. The number of resistant cultivars of Chinese cabbage to eight isolates of Xcc decreased according to the virulence increase of bacteria. Taken together, these results suggest that resistance of Chinese cabbage cultivars to Xcc is likely affected by the virulence of Xcc isolates, but not result from race differentiation.
https://doi.org/10.5423/RPD.2023.29.2.158 인용 PDF