• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.377-382
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• 2021

Oriental melon (Cucumis melo L.) is generally cultivated on the ground by creeping culture. A farmer has a higher workload for training stems. This study was conducted to find out a new cultivation of oriental melon to reduce a workload and improve the quality of fruit. There were three treatments for training stem of oriental melon; upward stem growing, downward stem growing, control (creeping stem growing). The results of the plant growth and the net photosynthesis showed higher in upward stem growing. The root activity was higher in downward stem attract. The yield was not significant as 4,055kg/10a in upward stem attract and 3,983kg/10a in downward stem attract. According to the results of the ergonomic agricultural workload evaluation, in the case of the working posture, the working posture of creeping cultivation methods (squatting, bending) showed a higher risk level than the upward and downward cultivation methods. Therefore, it is recommended the upward stem attract of oriental melon is a new cultivation as well as an alternative method for creeping stem attract in terms of improving the plant growth and yield, and reducing the workload.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.62 no.1
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• pp.60-65
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• 2017

This study was conducted to dentify the optimum plantlet type of 'Solara' potatoes (Solanum tuberosum L.) for growth in an aeroponics system. Plantlets of 'Solara' were transplanted on March 16, 2015 in a greenhouse, and growth and yield characteristics were investigated at 70 and 78 days after transplanting, respectively. Stem length was shorter in plantlet of 15-day-old stem cuttings and acclimatization of culture, and the stem length of plantlets of stem cuttings tended to increase with increasing stem cutting age. The fresh weight of plants was the highest in the plantlets of 40-day-old stem cuttings and the lowest in non-rooted stem cuttings and acclimatization of culture. The highest number of first stolons was obtained in 35-day-old stem cuttings. The number of second stolons was the highest in plantlets of 35-day-old stem cuttings, acclimatization of culture, and 30- day-old stem cuttings. The total number of tubers was higher in plantlets of 35-day-old stem cuttings and acclimatization of culture, and the number of tubers above 3 g was the highest in plantlets of 35-day-old stem cuttings. The weight of tubers above 3 g was the heaviest in plantlets of 35-day-old stem cuttings(1,947 g per 10 plants), followed by plantlets of 30-day-old stem cuttings. These results indicate that plantlets of 30 to 35-day-old stem cuttings could be the best for production of 'Solara' potato tubers in an aeroponics system.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.29 no.3
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• pp.285-290
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• 1984

The effects of retardants B995 and CCC on the growth and yield of soybean cultivar, kwanggyo, were investigated. The 3 application times(4th, 5th and 6th trifoliate leaf stage) combined with 4 concentrations (500, 1000, 2000 and 3000 ppm) were treated, and the retardant solutions were sprayed on the foliage. Only stem length in retardants, rate of podding in application times, and, in concentrations, stem length, number of branch, number of pod per plant and grain yield, were significant. In the inhibition of stem elongation, B995 was more effective than CCC, and rate of podding was the highest in the 4th leaf-spraying. The highest concentration, 3000 ppm, was the most effective in the inhibition of stem elongation and in the increase of number of branch and pod, rate of podding, and in yield. The number of node of mainstem, dry stem weight, chlorophyll and 100 grain weight were not significant with any treat. Yield had positively correlated with number of branch and pod, and rate of podding but negatively with stem length. The retardants was thought to be considerably conducive to the increase of yield.

• Biomolecules & Therapeutics
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• v.23 no.4
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• pp.313-319
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• 2015

P7C3 and its derivatives, 1-(3,6-dibromo-9H-carbazol-9-yl)-3-(p-tolylamino)propan-2-ol (1) and N-(3-(3,6-dibromo-9H-carbazol-9-yl)-2-hydroxypropyl)-N-(3-methoxyphenyl)-4-methylbenzenesulfonamide (2), were previously reported to increase neurogenesis in rat neural stem cells (NSCs). Although P7C3 is known to increase neurogenesis by protecting newborn neurons, it is not known whether its derivatives also have protective effects to increase neurogenesis. In the current study, we examined how 1 induces neurogenesis. The treatment of 1 in NSCs increased numbers of cells in the absence of epidermal growth factor (EGF) and fibroblast growth factor 2 (FGF2), while not affecting those in the presence of growth factors. Compound 1 did not induce astrocytogenesis during NSC differentiation. 5-Bromo-2'-deoxyuridine (BrdU) pulsing experiments showed that 1 significantly enhanced BrdU-positive neurons. Taken together, our data suggest that 1 promotes neurogenesis by the induction of final cell division during NSC differentiation.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.23 no.1
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• pp.28-32
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• 2012

Vocal fold scar disrupts structure of lamina propria and causes significant change in vocal fold tissue biomechanics, resulting in a range of voice problems that often significantly compromise patient quality of life. Although several therapeutic management have been offered in an attempt to improve vocal fold scar, the ideal treatment has not yet been found. Recently, several tissue engineering technique for vocal fold scar using growth factors, several cells, and scaffolds have been described in tissue culture and animal models. Several growth factors such as hepatocyte growth factor, basic fibroblast growth factor, and transforming growth factor beta 3 for therapy and prevention of vocal fold scar have been studied. Cell types to regenerate vocal folds in scarring tissue have been introduced autologous or scarred vocal fold fibroblast and adult mesenchymal stem cells. Decellularized organ matrix and several hyaluronic acid materials have used as scaffolds for vocal fold scar.

• Journal of Science Education
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• v.45 no.1
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• pp.11-22
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• 2021

The purpose of this study is to identify the main issues of international STEM education by synthesizing the findings in the field of global STEM education. The data in this study are the results of meta-analysis or systematic literature studies that reflect key issues of STEM education through the review of selection criteria and groups of experts. The following issues of STEM education were selected by conducting a qualitative meta-analysis of a total of 23 studies. First, STEM education is a global educational trend and has been studied in many countries such as the United States, Canada, Australia, Republic of Korea, and Turkey. Second, STEM education contributes positively to the improvement of students' cognitive, affective, psychomotor, and career domains. Third, STEM education has been studied with the use of various instructional tools and technologies. Furthermore, the growth of teachers' expertise in STEM education is one of the main factors for the implementation of successful STEM education. In addition, issues such as diversity, equity, and valid and reliable research design were discussed for the successful practice of STEM education. This study provides implications for the direction of convergence education and practical strategies in South Korea and gives suggestions for future research.

• Korean Journal of Medicinal Crop Science
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• v.20 no.1
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• pp.47-53
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• 2012

This study was conducted to examine effects of plant growth regulators and light resources on the formation of multiple shoot and plant regeneration of Hovenia dulcis var. koreana Nakai. Stem and shoot tip were cultured on MS medium or WPM supplemented with various plant growth regulators. At the single treatment, the highest shoot formation was obtained when stem explants were cultured on WPM supplemented with kinetin $1.0mg{\cdot}L^{-1}$. MS medium containing NAA 0.1 and TDZ $0.1mg{\cdot}L^{-1}$ gave the best results for shoot induction rate and shoot growth in combination treatments. Of the BAP and kinetin tested, BAP $0.5mg{\cdot}L^{-1}$ on WPM was found to be more effective for shoot growth from shoot tip. Under white fluorescent light treatment, shoot growth was much higher than blue, red LED treatments. Root induction from in vitro growth of plantlet was the best on WPM supplemented with $1.0mg{\cdot}L^{-1}$ IBA. The results suggest that selection of plant growth regulators and light resources could be important factor to achieve an efficient in vitro growth.

• Molecules and Cells
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• v.28 no.1
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• pp.7-12
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• 2009

Gliomas, much like other cancers, are composed of a heterogeneous mix of neoplastic and non-neoplastic cells that include both native and recruited cells. There is extensive diversity among the tumor cells, with differing capacity for In vitro and in vivo growth, a property intimately linked to the cell's differentiation status. Those cells that are undifferentiated, self-renewing, with the capacity for developing tumors (tumorigenic) cells are designated by some as cancer stem cells, because of the stem-like properties. These cells may be a critical therapeutic target. However the exact identity and cell(s) of origin of the socalled glioma cancer stem cell remain elusive. Here we review the current understanding of glioma cancer stem cell biology.

• Research in Mathematical Education
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• v.27 no.1
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• pp.111-127
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• 2024

There is an increasing concern in the United States regarding the workforce's ability to maintain a competitive position in the global economy. This has led to an increased interest in effective science, technology, engineering, and mathematics (STEM) education. The purpose of this study was to investigate the effect of STEM project-based learning (PBL) on students' self-regulation and motivation to learn. Secondary students (n = 60) participated in a STEM summer camp in which STEM PBL was utilized. Results showed that students increased their self-regulation skills (t = 2.83, df = 59, p = .004) and motivation (t = 2.25, df = 59, p =.004), with Cohen's d effect sizes of 0.395 and 0.404, respectively. Student-centered learning and peer collaboration while solving real-world problems were likely the greatest contributing factors to the outcomes. Educators should utilize the results to provide opportunities for students to experience STEM PBL.

• Journal of the East Asian Society of Dietary Life
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• v.14 no.5
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• pp.407-417
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• 2004

This study was conducted to investigate the application possibility of leaf and stem extract(LSE) extracted from the mixture of leaf and stem of ginseng radix(Panax ginseng CA. Meyer). This study measured the intake levels and efficiency ratio, growth rate, absorption ratio of carbohydrate, lipid and protein of rat by feeding with LSE during 6 weeks. We analyse the hematological and serum metabolic variables, serum lipid concentrations. Total diet and protein intake levels were low, but efficiency ratios were significantly high in LSE administered groups than the control group. Weight gain, liver and kidney weight of LSE groups were significantly higher than the control group. Blood RBC, Hct, Hb, total protein and albumin concentrations were reasonable levels in LSE administered groups compared to the basal diet group. Also serum total cholesterol, LDL-cholesterol, triglyceride contents of LSE groups were low, but HDL-cholesterol level was higher than the basal diet group. These results imply that leaf and stem of ginseng radix could be used as possible food resources, functional food material and feed stuff.