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Seasonal Variation of Rubber Production in Russian Dandelion, Taraxacum kok-saghyz, Grown in Korea
Sandeep Kumar Tata,홍승백(Seung Baek Hong),배성우(Sung Woo Bae),박종찬(Jong-Chan Park),Stephen Beungtae Ryu 한국자원식물학회 2022 한국자원식물학회지 Vol.35 No.3
Russian dandelion, Taraxacum kok-saghyz L.E.Rodin, is an important alternative source of natural rubber. Thus, it is critical to identify the best season for natural rubber production and harvesting for this species. In this study, T. kok-saghyz was grown in experimental fields in Korea to check the variation in rubber content with the change in the season. Studies using T. kok-saghyz plants indicate that spring and autumn are the best seasons for rubber accumulation. For several reasons, our study suggests that planting in autumn and harvesting in late spring is the best strategy for economic cultivation in Korea. Our data will be useful for future commercialization of rubber production from T. kok-saghyz because time will be saved if the plant is grown and harvested in the optimum season.
Kyung Hwan Kim(김경환),Ja Yoon Ku(구자윤),Won Young Park(박원영),Seung Baek Hong(홍승백),Suk Kim(김석),Hong Koo Ha(하홍구) 대한비뇨기종양학회 2020 대한비뇨기종양학회지 Vol.18 No.2
Purpose: Our study aimed to evaluate the predictive value of multiparametric magnetic resonance imaging (mpMRI) to assess the capsular extension of prostate cancer. Risk factors for extraprostatic invasion or microscopic invasion of bladder neck (pT3a stage) in the cases showing localized disease findings on MRI scan were also identified. Materials and Methods: We identified 198 patients who underwent robot-assisted or conventional laparoscopic radical prostatectomy in our institute between June, 2016 and May, 2018. Altogether, 170 patients with preoperational mpMRI scans and complete pathologic data were included. Positive and negative predictive values of mpMRI to detect capsular extension were estimated. Chi-square test was performed for ratio variables. Logistic regression analysis was performed to identify capsular invasion risk factors. Results: Median age and prostate-specific antigen level were 68 years and 7.5 ng/mL, respectively. Based on findings, 16 patients (9.4%) were identified as cT3a stage (unilateral or bilateral extraprostatic extension), whereas 37 patients (21.8%) as pT3a stage. Positive and negative predictive values of mpMRI to detect capsular extension were 75.0% and 73.9%, respectively. In the logistic regression analysis, positive biopsy core rate was the significant predictor for pT3a disease in the patients with negative capsular invasion findings on mpMRI (p<0.001). According to receiver-operating characteristic curve (area under the curve=0.691, p=0.001), the positive biopsy core rate of 0.275 was the best threshold. Conclusions: Multiparametric MRI is an appropriate test to predict pT3a disease preoperatively. The patients with positive core rate over 0.275 may have pT3a diseases despite negative image findings.