• 미생물학회지
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• 제49권2호
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• pp.131-136
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• 2013

본 연구에서는 헤어리베치로부터 뿌리혹 형성능과 질소 고정능이 우수한 Rhizobium 균주를 분리하고자 하였다. 전국의 일곱 군데 헤어리베치 재배 지역에서 수집 후 뿌리혹으로부터 균주를 분리하였고, 헤어리베치에 분리 균주를 재접종하여 뿌리혹 형성능과 질소 고정능을 확인하였다. 그 결과, 52개의 Rhizobium 속 균주를 분리하였고, 이 중 0.5% NaCl 농도 이상에서 자라는 Rhizobium은 16균주이었다. 뿌리혹 형성능은 16개 균주 중 Rhizobium sp. RH1, RH3, RH81, RH82, RH84, RH93의 균주를 접종한 시험구에서 우수하였다. 또한, 질소 고정능을 확인한 결과 Rhizobium sp. RH84가 가장 높은 acetylene reduction activity를 보였다. 이러한 결과는 향후 염의 분포가 불균일한 간척지에 적용 시에도 헤어리베치의 생육을 촉진해 녹비 작물로의 활용 가능성을 높여주는 결과로 판단된다.

• Journal of Periodontal and Implant Science
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• 제34권1호
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• pp.163-175
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• 2004

This study was performed to evaluate bone formation in the calvaria of rabbit by the concept of guided bone regeneration with titanium mesh membrane and demineralized freeze-dried bone. The animal was sacrificed at 2 weeks, 4 weeks, 8 weeks, and 12 weeks after the surgery. Non-decalcified specimens were processed for histologic analysis. 1. The titanium mesh but the biocompatibility was excellent the cell-occlusiveness was feeble. 2. The cell-occlusiveness was feeble and also the soft tissue growth of the upper part of the newly-formed bone after operating was excellent in early stage. 3. The maintenance ability of the space for the GBR very was excellent. 4. The titanium mesh the tissue-integration was superior the wound fixation ability excellent. 5. The demineralized freeze-dried bone did not promote the bone regeneration. 6. With the lapse of time, formation quantity of the bone some it increased, it increased quantity very it was feeble. Within the above results, the titanium mesh for the guided bone regeneration was excellent, the dεmineralized freeze-dried bone confirmed does not promote bone regeneration.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1999년도 춘계학술발표논문집 논문집
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• pp.3-6
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• 1999

The study was performed to evaluate the sense of equilibrium by means of rotary chair system in middle school girls with dance learning. Control of equilibrium, which is the most important function in dancing, is maintained by vestibular, visual, and proprioceptive inputs. Experimental groups were divided into trained group with dance (experimental group, 13~14 ys, n=15) and untrained group (control group, 13~14 ys, n=15). experimental group was trained by programmed dancing for 12 weeks, 45 min/day and 5 day/week. Gain of eye movement was measured for vestibulocular reflex (VOR), visual vestibular stimulation (VVOR), optokinetic stimulation(OKN), and visual fixation (VFX). The gain of eye movement at higher than 0.08 hz was significant decrease in experimental group, and VVOR showed the similar fashion to VOR. The gain in OKN and VFX was not significant difference between experimental and control groups. These results suggest that programmed training of dancing improves control of balance by adaptation of the vestibular function, and rotary chair system would be useful to evaluate the sense of equilibrium ability.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권4호
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• pp.615-620
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• 1996

The coronal approach is a versatile surgical technique. This method becomes particulary useful for exposure and internal fixation of midfacial fractures and the harvest of calvarial bone graft to manage the complex facial bone fractures. The rectrospective clinical study on the use of this technique in 10 patients was performed. The result shows that this technique provides the excellent exposure of fractures site, the ability to reduce the fragment accurately and good cosmetic results in incision area. We discussed with literatures review that anatomy, technique, indications, and potential complications of the coronal approach.

• Journal of Ginseng Research
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• 제46권1호
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• pp.1-10
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• 2022

Ginseng has been well-known as a medicinal plant for thousands of years. Bacterial endophytes ubiquitously colonize the inside tissues of ginseng without any disease symptoms. The identification of bacterial endophytes is conducted through either the internal transcribed spacer region combined with ribosomal sequences or metagenomics. Bacterial endophyte communities differ in their diversity and composition profile, depending on the geographical location, cultivation condition, and tissue, age, and species of ginseng. Bacterial endophytes have a significant effect on the growth of ginseng through indole-3-acetic acid (IAA) and siderophore production, phosphate solubilization, and nitrogen fixation. Moreover, bacterial endophytes can protect ginseng by acting as biocontrol agents. Interestingly, bacterial endophytes isolated from Panax species have the potential to produce ginsenosides and bioactive metabolites, which can be used in the production of food and medicine. The ability of bacterial endophytes to transform major ginsenosides into minor ginsenosides using β-glucosidase is gaining increasing attention as a promising biotechnology. Recently, metabolic engineering has accelerated the possibilities for potential applications of bacterial endophytes in producing beneficial secondary metabolites.

• 한국진공학회지
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• 제7권s1호
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• pp.30-36
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• 1998

The plasma-spray technique is currently the most frequently used method to produce calcium phosphate coatings. Hydroxyapatite(HAp), one form of calcium phosphate, is preferred by its ability to form a direct bond with living bone, resulting in improvements of implant fixation and faster bone healing. Recently, concerns have been raised regarding the viable use and long-term stability of plasma-spray HAp coatings due to its nature of comparatively thick, porous, and poor bonding strength to metal implants. Thin layers (maximum of few microns) of calcium phosphate were formed by an e-beam evaporation with and without ion bombardments. The Ca/P ration of film was controlled by either using the evaporants having the different ration of Ca/P with addition of CaO, or adjusting the ion beam assist current. The Ca/P ration had great effects on the structure formation after heat treatment and the dissolution bahavior. The calcium phosphate films produced by IBAD exhibited high adhesion strength.

• 한국약용작물학회지
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• 제22권4호
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• pp.306-312
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• 2014

Endophytes are microorganisms that live in the internal tissues of plants without harming the host plants. In this symbiotic relationship, the host plants provide nutrients and shelter to the endophytes, in turn, endophytes can promote the growth of host plants and act as a biological control agents against plant pathogens. Plant-microbe interactions like this are noted for natural methods for sustainable agriculture and environmental conservation. However, in spite of the infinite potential, there are only a few reports on the endophytes present in ginseng. In this study, we isolated and identified the endophytes from Panax ginseng seeds and evaluated the biological activities (IAA production ability, nitrogen fixation ability, phosphate solubilization capacity, siderophore production ability, and antifungal activities) of the endophyte isolates. Eight different endophytes were identified by 16S rRNA sequencing. Most of the endophytes have antibiotic and plant growth promoting (PGP) activities. Particularly, PgSEB5-37E have the highest antibiotic activity, both PgSEB5-37B and PgSEB5-37H have high PGP traits such as an abilities to produce IAA, solubilize phosphate and fix nitrogen. These results indicated that the endophytes from P. ginseng seeds may have applicable value to many industries. In order to use the isolated endophytes, quantitative analysis and field tests are needed to be performed.

• 한국학교수학회논문집
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• 제26권2호
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• pp.137-158
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• 2023

본 연구는 1993년부터 시행된 대학수학능력시험 수학 영역의 변화를 살펴봄으로써 향후 수학 영역 체제의 개선 방향을 탐색하고 우리나라 고등학교 수학교육에서의 평가 방향 정립을 위한 시사점을 도출하고자 하였다. 이를 위해, 대학수학능력시험 수학 영역을 시험 체제, 내용 영역, 행동 영역을 중심으로 분석하고 다음과 같은 결과를 얻었다. 첫째, 시험 체제는 시험 시간, 문항 수 외에 평가 요소와 문항 유형 등에도 영향을 미쳤음을 확인하였다. 둘째, 내용 영역 분석을 통하여 교육과정과 평가 영역의 관계성을 확인하고, 평가 영역 설정의 중요성을 확인하였다. 셋째, 행동 영역 분석을 통하여 특정 행동 영역에서 문항 유형의 고착화 가능성을 확인하고, 평가 문항의 유형에 대한 지속적 변화의 필요성을 확인하였다. 이를 바탕으로 대학수학능력시험 수학 영역에서의 시대적 요구와 변화를 반영할 수 있는 평가의 방향과 그에 따른 제반 사항에 대하여 논의하였다.

• Applied Biological Chemistry
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• 제40권6호
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• pp.546-550
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• 1997

근류균과 대두의 공생에서 숙주 결합성을 조사하기 위하여 대두종자로 부터 분리한 lectin과 뿌리추출물과의 동일성 여부를 조사한 결과는 다음과 같다. 탈지 대두분으로 부터 분리한 lectin은 크로마토그라피와 전기영동상 단일물질로 분리되었고 백운 및 팔달로 부터 분리한 lectin은 표준 lectin의 항체와 항원-항체 반응을 나타내어 동일한 물질이었다. 종자lectin 및 뿌리추출물 및 뿌리분비물에 대한 화학주성은 RCR 3407, KCTC 2422에서 뿌리분비물에 대한 주성이 가장 높았고 종자 lectin과 뿌리추출물은 비슷한 화학주성을 나타내었다. 대두의 유근으로 부터 분리한 뿌리추출물은 표준 lectin의 항체와 침강선을 형성하여 대두 종자 lectin과 동일한 물질임을 알수 있었으며 뿌리 분비물과는 침강선을 형성치 않았다. 대두와 상호접종군을 형성하는 RCR3407, KCTC2422 및 LPN-101은 대두의 종자 lectin 및 뿌리추출물과 결합하였으나 완두의 lectin과는 결합하지 않았고 대두와 근류형성을 하지않는 LPN-100은 대두의 lectin과 결합하지 않았다.

• 한국과학교육학회지
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• 제34권8호
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• pp.795-806
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• 2014

이 연구는 초등과학부진학생들의 기초과학탐구능력을 향상하기 위해 중재프로그램을 개발하고 안구추적기를 활용해 중재프로그램의 효과를 검증하는데 있다. 연구 참여자는 초등과학부진학생 35명이었다. 안구운동추적기는 SMI사의 iView XTM RED로 고정형이고 샘플링 속도는 120 Hz이었다. 실험을 설계하고 분석하기 위해 Experiment 3.4와 BeGaze 3.4 프로그램을 사용하였다. 연구결과는 다음과 같다. 첫째 기초탐구 교수전략, 교사 학생 행동, 교수-학습지도안, 학습 활동지를 포함하여 중재프로그램을 개발하였다. 둘째, 중재프로그램 적용결과 기초과학탐구능력이 향상되었고 전체 문제해결시간이 통계적으로 유의미하게 줄어들었다. 셋째, 기초과학탐구 문제영역과 핵심단어에 대한 평균응시시간이 통계적으로 유의미하게 감소하였다. 넷째, 기초과학탐구문제해결과정에서 동공 크기(pupil diameter)가 통계적으로 유의미하게 확장되었다. 다섯째, 기초과학탐구문제해결과정에서 평균도약시간(average saccade time)은 통계적으로 유의미하게 증가하였다. 여섯째, 문제 단서영역에 대한 평균응시도입시간(average fixation entry time)은 통계적으로 유의미하게 빨라졌고, 평균응시시간은 통계적으로 유의미하게 줄어들었다.