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172. Supplemental irradiation with far-red light-emitting diodes improves growth and phenolic contents in Crepidiastrum denticulatumin a plant factory with artificial lighting

Author

Bae, Ji-Hoon, Park, Song-Yi, and Oh, Myung-Min

Abstract

The aim of this study was to analyze the growth and phytochemical composition of Crepidiastrum denticulatum, a valuable medicinal plant, in response to various periods of irradiation and ratios of far-red (FR) LED light combined with red (R) and blue (B) LED lights. Three-week-old C. denticulatumseedlings were transplanted to a hydroponic system in a plant factory equipped with R, B, and FR LEDs. The ratio of R to B LEDs was set at 8:2 (R8B2), and the ratio of R to FR LEDs was adjusted to 0.7, 1.2, 4.1, and 8.6. R8B2 (without FR LEDs) and commercial LEDs were used as control I and II, respectively. The plants were cultivated under these light treatments, and some of the control plants were subjected to four different R/FR ratios for 30 min before the end of the light period (EOL). We measured growth characteristics, total phenolic contents, and the levels of individual phenolic compounds (chlorogenic acid, caffeic acid, and chicoric acid) 6 weeks after treatment. Shoot fresh and dry weight, leaf area, leaf length, and leaf width under R/FR ratios of 0.7 and 1.2 were 1.8- to 2.4-times higher than those of the control plants. Continuous R/FR 0.7 and 1.2 irradiation reduced the total phenolic content per dry weight compared to the control, although this effect was not significant. The total phenolic content per plant under R/FR 0.7 and 1.2 increased more than 2-fold, and the shoot fresh weight increased 1.7- and 1.6-fold, compared to control I. Individual phenolic compound levels exhibited the same trends as total phenolic content. Under R/FR 0.7 and 1.2, chlorogenic acid, caffeic acid, and chicoric acid levels per shoot increased 1.3- to 1.8-fold compared to control I. FR EOL treatments did not have a significant effects on growth or the contents of bioactive compounds. These results suggest that supplemental irradiation with FR LEDs could be used to improve C. denticulatumgrowth and quality in terms of phytochemical composition when grown in a plant factory with artificial lighting.

Published
2017
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198. An integrity of reactor vessel head and ICI nozzle under in-vessel vapor explosion loads.

Author

Jeon, Jong-Won, Cho, Jong-Rae, Bae, Ji-Hoon, and Bang, Kwang-Hyun

Abstract

An integrity assessment of lower head and ICI nozzle of the reactor vessel of Sinkori (SKR) #3/4 units under in-vessel vapor explosion loads has been performed. The core melt relocation parameters were chosen within the ranges of physically realizable boundaries. The premixing and explosion calculations were performed using TRACER-II code. Using the calculated explosion pressures imposed on the lower head inner wall and ICI nozzles, strain and stress were analyzed using ANSYS code. Then, the calculated strain results and the established failure criteria were used in determining the failure probability of the lower head and the ICI nozzles. Strain analyses showed that the failure of the lower head and the ICI nozzle due to the vapor explosion was not possible under the present framework of assessment. [ABSTRACT FROM AUTHOR]

Published
2015
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199. Arthroscopic posteromedial drive-through test in posterior cruciate ligament insufficiency: a new diagnostic test.

Author

Nha, Kyung-Wook, Bae, Ji-Hoon, Kwon, Jae-Ho, Kim, Jae-Gyun, Jo, Dae-Yeon, and Lim, Hong-Chul

Subjects
*POSTERIOR cruciate ligament injuries, *RANGE of motion of joints, *ARTHROSCOPY, *JOINT hypermobility, *KNEE radiography, *DIAGNOSIS
Abstract

Purpose: The study investigated the prevalence of the posteromedial drive-through sign in patients undergoing knee arthroscopy and determined its relationship to posterior cruciate ligament (PCL) insufficiency. Methods: A retrospective review was performed on 1,015 patients undergoing knee arthroscopy from 2009 to 2012 at two institutions. During knee arthroscopy, the ability to pass the arthroscope easily between the medial femoral condyle and the PCL is considered a positive posteromedial drive-through sign. We calculated the accuracy, sensitivity, specificity, positive predictive value and negative predictive value of posteromedial drive-through sign for diagnosis of PCL ruptures. The posterior laxity measured by Telos stress radiograph was compared between the posteromedial drive-through sign (+) and (−) patients with PCL ruptures. Results: Of the 1,015 patients, 73 (7 %) had a positive posteromedial drive-through sign. For the diagnosis of PCL rupture, a posteromedial drive-through sign had an overall accuracy of 97.6 %, sensitivity of 78.8 %, specificity of 99.3 %, positive predictive value of 91.7 % and negative predictive value of 98.1 %. For the ligament laxity examination using stress radiographs, the mean posterior tibia translation was 13.8 ± 2.2 mm, while the mean posterior translation was 10.6 ± 2.4 mm in those with a negative posteromedial drive-through sign ( p < 0.05). There was no relationship between a positive posteromedial drive-through sign and age and combined injuries (n.s.). Conclusion: A positive posteromedial drive-through sign strongly indicates the presence of PCL injuries and this arthroscopic sign is highly associated with grade III posterior knee instability. Level of evidence: III. [ABSTRACT FROM AUTHOR]

Published
2015
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