• 한국자원식물학회지
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• 제35권6호
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• pp.770-777
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• 2022

The main objective of this study was to identify the most appropriate condition for root formation of in vitro micropropagated pear (Pyrus spp.) plants. In vitro propagation was induced on Murashige and Skoog (MS) medium with 2.0 mg/L of N6-benzyladenine (BA) and 0.2 mg/L of Indole-3-butyric acid (IBA) medium. The short pre-treatment of explants with a high concentration (1 mg/L) of NAA and IBA (R0 medium) in dark for three days, followed by transfer to five different media (R1 to R5) resulted in good rooting responses in the pear 'Oharabani (P. pyrifolia × P. communis)' genotype. For the rooting experiments, the highest rooting percentage (83.3 ± 8.3%), average root length (3.6 ± 1.9 mm), total root number (31 ± 4.0), and average root number per plant (2.6 ± 2.1) were obtained on half strength (1/2) of MS medium supplemented with 30 g/L sucrose without hormones and activated charcoal (AC) (R1 medium). The highest rooting percentage was obtained at 83.3% from explants on R1 and R3 media. The rooting procedure described in this study resulted in good root formation and significantly shorting the root induction time to within 14 days of culture. Further studies are underway to test the suitability of the protocol developed in this study for other pear genotypes.

• 전기학회논문지
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• 제65권6호
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• pp.1019-1025
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• 2016

This paper proposes a parallel reduced-order square-root unscented Kalman filter for state estimation of a sensorless permanent-magnet synchronous motor. The appearance of an unscented Kalman filter is caused by the linearization process error between a real system and classical Kalman model. The unscented transformation can make a more accurate Kalman model. However, the complexity is its main drawback. This paper investigates the design and implementation of the proposed filter with Potter and Carlson square-root form. The proposed parallel reduced-order square-root unscented Kalman filter reduces memory and code size, and improves numerical computation. And the performance is not significantly different from the unscented Kalman filter. The experimentation is performed for the verification of the proposed filter.

• Journal of Welding and Joining
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• 제19권3호
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• pp.298-304
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• 2001

Turbine blade is subject to force of three types ; the torsional force by torsional mount, the centrifugal force by the rotation of rotor and the cyclic bending force by steam pressure. The cyclic bending force was a main factor on fatigue strength. SEM fractography in root of turbine blade showed micro-clack width was not dependent on stress intensity factor range. Especially, fatigue did not exist on SEM photograph in root of turbine blade. To clear out the fracture mechanism of turbine blade, nanofractography was needed on 3-dimensional crack initiation and crack growth with high magnification. Fatigue striation partially existed on AFM photograph in root of turbine blade. Therefore, to find a fracture mechanism of the torsion-mounted blade in nuclear power plant, the relation between stress intensity factor range and surface roughness measured by AFM was estimated, and then the load amplitude ΔP applied to turbine blade was predicted exactly by root mean square roughness.

• 한국작물학회지
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• 제36권5호
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• pp.459-480
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• 1991

인삼의 생리장해를 산지중심으로 증상별로 종합검토하였다. 뿌리의 장해는 적피, 은피, 동해, 동해, 근부, 안삼, 출아불재, 달래삼, 소수가 있고 지상부에는 황엽, 조기낙엽, 소엽, 지엽, 백반엽, 동해, 풍해와 경열이 있다. 적피와 황엽이 인삼생산에 가장 크게 영향한다. 농약해, 붕소과 잉해 및 산업공해에 의한 피해 경우도 보고되었다. 원료수삼 가공한 후의 품질요인에 관계되는 생리장해들도 검토하였다.

• 생물환경조절학회지
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• 제17권1호
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• pp.14-19
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• 2008

저온기의 딸기 재배를 위한 기초자료를 얻기 위하여 '아키히메(章姬)'품종을 재료로 딸기의 뿌리 발달에 미치는 저온의 영향과 지하부의 온도와 관련된 지상부의 생육을 조사하였다. $18^{\circ}C$의 근온처리구에서 1차근의 생육이 가장 양호하였으며 $8^{\circ}C$의 저온에서 뿌리의 신장률이 가장 낮았으며, 특히 측근의 수와 길이가 가장 저조하였다. 근부의 온도는 지상부의 생육에도 직접적인 영향을 미쳐서, 낮은 근권 온도에서는 지상부의 생체중, 엽면적, 엽장, 엽폭 및 엽수의 저하를 초래하였다. 본 실험의 결과는 지하부 온도관리의 중요성을 확인할 수 있는 것으로 딸기 촉성재배농가에 유용한 정보로 활용될 수 있을 것이다.

• 한국약용작물학회지
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• 제5권4호
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• pp.314-317
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• 1997

남부지방(南部地方)에서 황금(黃芩)의 맥후작(麥後作) 직파재배시 적정(直播栽培時 適定) 시비량(施肥量)을 구명(究明)하여 재배기술(栽培技術)을 개선(改善), 보완(補完)하고 수량(收量)을 증대(增大)시켜 안정생산(安定生産)에 기여(寄與)하고자 여천(麗川) 재래종(在來種)을 공시(供試)하여 실시(實施)한 시험결과(試驗結果)를 요약(要約)하면 다음과 같다. 1, 무비구(無肥區)$(N-P_2O_5-K_2O\;=\;0\;-\;0\;-\;0kg/10a)$의 개화기(開花期) 7월(月) 20일(日)에 비하여 모든 시비구(施肥區)가 7월(月) 21일(日)${\sim}$23일(日)로 $1{\sim}2$일(日) 늦게 개화(開花)하였다. 2. 생육형질(生育形質)인 경장(莖長), 경태(莖太), 분지수(分枝數), 주근장(主根長), 주근경(主根徑) 생경엽중(生莖葉重), 건경엽동(乾莖葉重)은 무비구(無肥區)에 비하여 모든 시비구(施肥區) 양호(良好)하였으나 다비구(多肥區)$(N-P_2O_5-K_2O\;=\;12-18-12kg/10a)$ 3. 수량형질(收量形質)인 건근중(乾根重)은 무비구(無肥區)보다 모든 시비구(施肥區)가 양호(良好)하였으나 그 중에서 중비구(中肥區)$(N-P_2O_5-K_2O\;=\;9-13.5-9kg/10a)$에서 10a당 건근중(乾根重)이 178kg으로 무비구(無肥區)의 126kg에 비(比)하여 41%가 증수(增收)되었고 표준시비구(標準施肥區)$(N-P_2O_5-K_2O\;=\;6-9-6kg/10a)$의 167kg에 비해서는 7%가 증수(增收)되었다.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
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• pp.608-608
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• 2003

The main objectives of root canal therapy are cleaning and shaping and then obturating the root canal system in 3 dimensions to prevent reinfection. Many instrumentation techniques and devices, supported by an irrigation system capable of removing pulp tissue remnants and dentin debris, have been proposed to shape root canals. But current regimens in chemomechanical debridement using instrumentation and irrigation with NaOCl are not predictably effective in root canal disinfection. These findings are not surprising because the root canal system is complex and contains numerous ramifications and anatomical irregularities. The microorganisms in root canals not only invade the anatomic irregularities of the root canal system but also are present in the dentinal tubules. Therefore further disinfection with an effective antimicrobial agent may be necessary and it well1mown that use of intracanal medication will lower bacterial count in infected root canals. Calcium hydroxide has a long history of use in endodontics, and more attention has been given to the use of calcium hydroxide as intracanal dressing for the treatment of infected pulp. However, when treatment is completed in one visit, no intracanal medications other than intracanal irrigants are used. Recently, a mixture of a tetracycline isomer, an acid, and a detergent(MTAD), has been introduced as a final rinse for disinfuction of the root canal system. It has been shown that MTAD is able to remove the smear layer with minimal erosive changes on the surface of dentin, and is effective against Enterococcus faecalis, a microorganism resistant to the action of other antimicrobial medications. In another study, the ability of MTAD was investigated to disinfect contaminated root canals with whole saliva and compared its efficacy to that of NaOCl Based on the results, it seems that MTAD is significantly more effective than 5.25% NaOCl in eradicating bacteria from infected root canals. In the cytotoxicity evaluation, MTAD is less cytotoxic than engenol, 3% $H20_2,\;Ca(OH)_2$ paste, 5.25% NaGCl, Peridex, and EDTA and more cytotoxic than 2.63%,1.31% and 0.66% NaOCl. Is it promising or transient?

• Mycobiology
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• 제42권1호
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• pp.66-72
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• 2014

Roselle (Hibiscus sabdariffa L.) family Malvaceae is an important crop used in food, cosmetics and pharmaceutics industries. Roselle is cultivated mainly in Upper Egypt (Qena and Aswan governorates) producing 94% of total production. Root rot disease of roselle is one of the most important diseases that attack both seedlings and adult plants causing serious losses in crop productivity and quality. The main objective of the present study is to identify and characterize pathogens associated with root rot and wilt symptoms of roselle in Qena, Upper Egypt and evaluate their pathogenicity under greenhouse and field condition. Fusarium oxysporum, Macrophomina phaseolina, Fusarium solani, Fusarium equiseti and Fusarium semitectum were isolated from the natural root rot diseases in roselle. All isolated fungi were morphologically characterized and varied in their pathogenic potentialities. They could attack roselle plants causing damping-off and root rot/wilt diseases in different pathogenicity tests. The highest pathogenicity was caused by F. oxysporum and M. phaseolina followed by F. solani. The least pathogenic fungi were F. equiseti followed by F. semitectum. It obviously noted that Baladi roselle cultivar was more susceptible to infection with all tested fungi than Sobhia 17 under greenhouse and field conditions. This is the first report of fungal pathogens causing root rot and vascular wilt in roselle in Upper Egypt.

• Journal of Plant Biotechnology
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• 제46권3호
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• pp.143-157
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• 2019

Medicinal plants are high-value natural resources that have been used as precautionary drugs by many people globally. The increasing global demand for bioactive compounds from medicinal plants has led to the overexploitation of many valuable species. One widely used approach to overcome this problem is the use of adventitious root cultures as a propagation strategy. This review examines the scientific research published globally on the application of adventitious root cultures for many medicinal plants. Adventitious roots generated under aseptic environments in suitable phytohormone-augmented medium exhibit high growth rates and production of important secondary metabolites. Parameters such as medium properties and composition, growth hormone type, and elicitation strategies for in vitro grown adventitious roots of medicinal plants, are the main topics discussed in this review. We also examine current developments in bioreactor system cultivation for plant bioactive compounds using adventitious root cultures, a technology with possible commercial applications, via several studies on adventitious root culture of medicinal plants in which bioreactor systems play a role. In conclusion, the development of adventitious root cultures for medicinal plants is highly useful because of their capability for vegetative propagation and germplasm preservation.

• 한국작물학회지
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• 제34권2호
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• pp.147-154
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• 1989

일본형 수도, 통일형 수도 및 통일형 수도의 교배친 등을 공시하여 이의 종근으로부터 근단을 1cm로 절취한 분리근을 천전 등의 $\ulcorner$개량배지$\lrcorner$를 기본으로 하여 pH, 당농도, Casamino acid 농도 등을 달리한 oq지에 무균배양한 분리근의 생장 튿성을 비교하였던 바 얻어진 결과를 요약하면 다음과 같다. 1. 분리근의 근장은 27$^{\circ}C$구에서는 일본형품종과 다수형 품종간에 별차이는 없었으나 3$0^{\circ}C$구에서는 일본형 수도에 비교해서 통일형 품종의 신장이 현저히 양호하였다. 2. 분리근의 건물중은 27$^{\circ}C$구 및 3$0^{\circ}C$구 공히 일본형 품종에 비교해서 통일형 품종이 현저하게 무거운 것으로 인정되었다. 3. 일본형 품종과 통일형 품종간에 나타난 분리근의 건물중 차이는 주로 측근발육의 양부에 따른 것으로 특히 2~3cm길이의 특근수에 차이가 인정되었다. 4. Casamino acid 반응에서 일본형 품종은 주근 및 측근의 생장이 0.2%구에서 양호하였으나, 통일형 품종에서는 대부분의 품종이 주근의 신장은 Casamino acid 무처리구에서 측근의 생장은 0.2%구에서 매우 양호하였다. 5. 분리근의 생장은 배지의 pH, 당농도 및 Casamino acid 농도 등을 달리한 경우에 있어서도 통일형 품종이 일본형 품종보다 양호하였다. 6. 통일형 품종의 교배친중 인도별 품종과 일본형 품종에 있어서 전자는 후자보다 분리근의 생장이 양호하였을 뿐만 아니라 Casamino acid반응이 통일형 품종과 거의 같은 경향인 것으로 나타났다.