• KOREAN JOURNAL OF CROP SCIENCE
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• v.46 no.6
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• pp.483-487
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• 2001

This study was conducted to examined the effects of TIBA and ethrel on podding rate, percentage of seed numbers per pod, and seed yield of black soybean. The black soybean variety “Geomjeongkong 1” was used. TIBA of 50, 100, and 150 ppm and ethrel of 500, 1,000, and 1,500 ppm were applied at V6 (fifth leaf stage), V8 (seventh leaf stage), and R1 (flowering stage). The podding rate was increased by the treatment of TIBA at R1 stage while it was decreased by ethrel at all growth stages. Compared with control, TIBA decreased 100 seed weight a little bit but ethrel increased it slightly, on the contrary. Both TIBA of 50 ppm and ethrel of 500 ppm increased the sued yield by 8 to 28％ compared with control regardless of growth stages of application; the highest seed yield was obtained at V6 stage of application of 50 ppm in TIBA and 500 ppm in ethrel, respectively.

• Polymer(Korea)
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• v.36 no.5
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• pp.593-598
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• 2012

Solution polymerization behaviors of L-lactide using single and mixed aluminium catalyst systems were studied. Triisobutylaluminium (TIBA) was a reference catalyst for mixing. For the $Al(O-i-Pr)_3$/TIBA catalytic systems, the molecular weight of the resulting polylactide (PLA) decreased as the composition of $Al(O-i-Pr)_3$ increased. The higher molecular weight shoulder was revealed in their GPC curve. At TIBA of 80 mol% a bimodal GPC curve was shown. The conversion in the trimethylaluminium (TMA)/TIBA catalysts system decreased as the composition of TMA in the mixed catalyst increased. The conversion in the trioctylaluminium (TOA)/TIBA catalysts system decreased as the composition of TOA in the mixed catalyst increased. The unimodal molecular weight distribution was observed with the TOA/TIBA catalyst systems. The Al compounds-mixed catalyst could produce a higher molecular weight shoulder in the GPC curve.

• Journal of Life Science
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• v.19 no.8
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• pp.1139-1144
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• 2009

It has been known that brassiolide (BL) increased the positive gravitropic response and ethylene production in maize roots. This study examined the relationship between the BL-induced gravitropic response and ethylene Production. The ethylene production was inhibited to about 90% of the control by the treatment of $10^{-4}$ M aminoethoxyvinylglycine (AVG), the ethylene synthesis inhibitor. However, the gravitropic response did not show any significant changes compared to the control at $10^{-4}$ M AVG. In the case of treatment of AVG with BL, the ethylene production decreased to 60% of the control. However, the gravitropic response increased to the level which was induced by BL. Cobalt ions, another ethylene biosynthesis inhibitor, inhibited ethylene production, but not gravitropic response. When roots were treated with BL and cobalt ions, they showed the inhibition of ethylene production and promotion of gravitropic response. To elucidate the possibility that the effect of BL is related to auxin transport, roots were treated with TIBA (2,3,5-triiodobenzoic acid), an auxin transport inhibitor. Both treatment of TIBA alone and TIBA with BL stimulated ethylene production to about 96% and 132%, respectively. However, gravitropic response was completely inhibited in both treatments. Further, roots treated with BL in the presence of TIBA and IAA showed a negative gravitropic response, which means that IAA accumulates in the upper side of horizontal roots. Root elongation was also stimulated in this treatment. Taken together, these results suggest that BL might affect the differential distribution of internal IAA on roots, causing the regulation of positive gravitropic response.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.1
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• pp.1-6
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• 1989

Three growth regulators, TIBA (2. 3. 5-Triiodobenzoic acid). ABA(Abscisic acid) and DGLP were sprayed on soybean plants sown on April 25 and May 10 to investigate those effect on growth and yield of Hwangkeumkong cultivar. TIBA or ABA reduced stem length. and lodging. however. increased stem diamater podding rate. number of pods and seeds per plant, and seed yield. Among 3 growth regulators TIBA was most effective to healthy growth and to increase of seed yield. Optimum treatment method for healthy plant growth and higher grain yield was 2-3 times spray with 5-day interval from 6 leaf stage (V6) of soybean plants. Soybean seed yield in the plot of TIBA treatment with 3 times from 6 leaf stage was 20% higher both in early and ordinary seeding field than those of non-treatment plots.

• Polymer(Korea)
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• v.36 no.1
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• pp.53-58
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• 2012

The differences between single and mixed aluminium catalyst systems in the bulk polymerization of L-lactide were studied. $Al(O-i-Pr)_3$, TMA, TOA and TIBA were employed for the mixed-catalyst systems, and TIBA was chosen as a reference catalyst. For the $Al(O-i-Pr)_3$/TIBA catalyst system, the conversion of polymerization increased as the composition of $Al(O-i-Pr)_3$ in the mixed catalyst increased. The molecular weight of the resulting PLA reached to about 13000 g/mol, and the polydispersity index of the polymer from the $Al(O-i-Pr)_3$/TIBA catalyst was slightly increased than that of single catalyst. The higher molecular weight tail or shoulder was revealed in the GPC curve. The conversion of the TOA/TIBA catalyst system decreased as the composition of TOA in the mixed catalyst increased. The molecular weight of PLA prepared with TOA/TIBA catalysts increased up to 14000 g/mol. The Al compounds-mixed catalysts could produce a higher molecular weight tail or shoulder in the GPC curve, which may result in enhancement of mechanical properties of PLA.

• Polymer(Korea)
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• v.26 no.3
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• pp.410-414
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• 2002

The late transition Pd catalyst of low oxophilicity that has ferrocene -based diimine ligand for stabilization of center metal had been synthesized and applied for the polymerization of methyl methacrylate (MMA). In the presence of triisobutylaluminium (TIBA) for impurity scavenger, the effects of polymerization temperature and [TIBA]/[Pd] mole ratio on the yield and glass transition temperature ($T_g$) of PMMA had been examined. For 40~$50^{\circ}C$ of polymerization temperature and 2000~3000 of [TIBA]/[Pd] mole ratio, higher polymer yields were obtained. It was observed that ($T_g$) of PMMA is almost independent to the polymerization temperature but influenced by the [TIBA]/[Pd] mole ratio. With the examination of($T_g$) of PMMA with the structure of polymer, it had been found that T$_{g}$ of PMMA exhibits a linear relationship with the isotacticity of polymer.r.

• Journal of Plant Biotechnology
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• v.36 no.3
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• pp.230-235
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• 2009

The effect of auxin transport inhibitor (TIBA and PCIB) or auxin synergist (phloroglucinol) on somatic embryo maturation and germination in Japanese larch (Larix leptolepis) was examined. The addition of 15.8 mg/L ABA+5.0 mg/L PCIB showed most promoted the maturation of cotyledon -staged somatic embryos (177.7/90 mg ESM). In contrast, with treatment of 5.0 mg/L PCIB or 5.0 mg/L TIBA, no somatic embryos were obtained. Considering from this result, PCIB or TIBA alone could not substitute for exogenously supplied ABA for maturation of somatic embryos. In the test of below concentration of 5.0 mg/L PCIB, the highest results were recorded in 15.8 mg/L ABA+2.0 mg/L PCIB (109.3/90 mg ESM) or 15.8 mg/L ABA+5.0 mg/L PCIB (103.7/90 mg ESM). However, 5.0 mg/L phloroglucinol (0/90 mg ESM) or no ABA addition (3/90 mg ESM) had little influence on somatic embryos maturation. In germination study, the highest frequency of plantlet regeneration obtained from the somatic embryos which had matured on 15.8 mg/L ABA+5.0 mg/L PCIB (67.9%). However, either 5.0 mg/L PCIB nor 5.0 mg/L TIBA resulted in obtained from plantlets.

• Journal of Plant Biology
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• v.30 no.2
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• pp.135-149
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• 1987

An experiment was made in order to analyze the growth characteristics and productivity of Zoysia japonica under control, mowing and TIBA treatment conditions at the experimental farm of Kyung Hee University. The field was planned by the split plot design method and each treatment was given to two plots (40$\times$40 and 100$\times$100 mm) and was replicated three times. Each plot was 9$m^2$ for Zoysia japonica. The sampling of each plot was taken once a week after sowing. In order to know the dry matter of total standing crops, each organ of plants was kept at 9$0^{\circ}C$ and weighed. Total leaf area of a plant was measured by drawing method. The author adopted the growth analysis of English School. Holocellulose analysis by sodium chlorite method was made. The increasing rate of LAI was high in all plots between 10th and 12th week after sowing and high growth rate of assimilatory organ was observed in low density area of TIBA plot. Between 10th and 12th week after sowing all the experimental plots showed high increasing rate of standing crop and in the process of growth each density area of TIBA plot recorded high increasing rate. In all the plots F/C ratio and RGR were high when the growth rate of assimilatory organ was increasing cosiderably, and the higher the planting density was, the higher F/C ratio was recorded. In all the plots NAR recorded maximum rate before the growth period to show a high increase of RGR. In the process of the growth TIBA plot showed high icnreasing rate of NAR. CGR showed high value in high density areas of all the plots and reached its maximum in the 13th week after sowing. Compared to the other experimental areas the low planting density areas of control plot and TIBA plot showed considerable earlier lignification indicating low Holocellulose content in the growth process.

• Proceedings of the Materials Research Society of Korea Conference
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• 1994.11a
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• pp.188-188
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• 1994

• Proceedings of the Korean Society of Crop Science Conference
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• 1988.07a
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• pp.42-43
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• 1988