• 식물분류학회지
• /
• 제42권4호
• /
• pp.335-339
• /
• 2012

국내 미기록 식물인 긴화살사초(Carex benkei T. Shimizu)를 전라남도 신안군 임자면 재원리 재원도와 제주도 제주시 조천읍 선흘리 동백동산에서 확인하였다. 긴화살사초는 화살사초(Carex transversa Boott)와 흰꼬리사초(Carex brownii Tuck.)의 근연종으로, 까락을 제외한 자인편의 길이가 과낭의 길이와 거의 유사하며, 수과에 연결된 부리에 고리모양의 부속체가 있는 특징으로 구분된다. 새로운 국명은 화살사초에 비해 까락을 제외한 자인편의 길이가 긴 특징에 따라 '긴화살사초'로 하였고, 이에 대한 기재, 도해, 사진 및 흰꼬리사초절 분류군과의 검색표를 제시하였다.

• Imaging Science in Dentistry
• /
• 제37권1호
• /
• pp.27-33
• /
• 2007

Purpose : The research was done to investigate the effectiveness of 2D bony morphometry and microstructure of micro-computed tomography (micro-CT) on the osteoporotic bony change. We performed the bone morphometric analysis of proximal femur in ovariectomized rabbits with BMD and micro-CT examination. Materials and Methods : Twenty-one female (Newzealand, about 16 weeks old, 2.9-3.4kg) rabbits were used. Three rabbits were sacrificed on the day when experiment began (Baseline). The remaining 18 rabbits were divided into two groups. One group was ovariectomized bilaterally (OVX) and the other animals were subjected to sham operation (Sham). Bone specimens were obtained from the right and left femur of sacrificed rabbits. At intervals of 1, 2, 3, 5, 6 months respectively, BMD tests were performed on the proximal femur by using PIXlmus 2 (GE Lunar Co. USA), 2-dimensional bone morphometric analysis by custome computer program and 2D/3D bone structure analysis by micro-CT (Skyscan 1072, Antwerpen, Belgium). Statistical analysis was carried out for the correlation between bone morphometry, micro-CT and BMD Result : BV/TV, Tb.Th, Tb.N of micro-CT parameters showed higher values in sham group than OVX group. N.Nd/Ar.RI, N.NdNd, N.NdTm, N. TmTm, PmB/Ar.RI, 3-D BoxSlope of 2D morphometric parameters showed higher values in Sham group than OVX group. The micro-CT parameters of Tb.Sp, Tb.N were statistically significant correlated with BMD respectively. Several 2D morphometric parameters were statistically significant correlated with BMD respectively. Conclusion : Several parameters of 2D bony morphometry and micro-CT showed effective aspects on the osteoporotic bony change.

• 식물분류학회지
• /
• 제39권4호
• /
• pp.309-314
• /
• 2009

전남 구례군, 광주광역시 그리고 인천광역시에서 미기록 귀화식물 2종을 발견하였다. 유럽육절보리풀로 이름 붙인 Glyceria declinata $Br{\acute{e}}b$.(벼과)는 전남 구례군 구례읍 섬진강 부근과 광주광역시 동구 사동 광주천 부근에서 확인되었으며, 근연 분류군인 육절보리풀(G. acutiflora)과 비교하여 소수의 길이는 15-20mm로 짧고, 호영의 끝부분이 뭉툭한 특징으로 구별된다. 또한 처진미꾸리광이로 이름 붙인 Puccinellia distans (Jacq.) Parl. (벼과) 는 인천광역시 영종도, 용유도, 강화군 초지진 등에서 확인되었으며, 근연 분류군인 갯꾸러미풀(P. nipponica)에 비해 호영은 길이 1.8-2.5mm이고, 엽설은 길이 1-2mm로 더 작고, 개화기 후 화서의 밑 부분 가지가 밑으로 젖혀지는 특징으로 구별된다.

• 한국지반공학회논문집
• /
• 제36권9호
• /
• pp.5-20
• /
• 2020

2017년 발생한 포항지진에서는 계기지진 이래 처음으로 액상화 현상이 목격되었다. 본 연구에서는 액상화 현상이 목격된 포항시 (1) 송림공원, (2) 흥해읍 망천리, (3) 흥안리를 대상으로 다양한 지반조사 및 실내실험을 수행하였다. 액상화 발생위치의 동적특성을 파악하기 위해 지반조사 항목으로는 표준관입시험(SPT), 콘관입시험(CPT), 표면파탐사(MASW), 밀도검층, 다운홀테스트, 전기비저항탐사를 수행하였고, 현장에서 채취한 시료를 바탕으로 진동삼축압축 시험기를 통해 액상화실험을 수행하였다. 그 결과 세 곳 모두 지하수위가 높고 얕은 심도에 연약한 모래층이 존재하며, 송림공원에서 채취한 모래는 주문진 표준사, Toyoura 모래, Ottawa 모래에 비해 액상화 저항강도가 작은 것을 확인하였다.

• 지구물리
• /
• 제7권2호
• /
• pp.113-120
• /
• 2004

Hydrochemical characteristics of deep groundwater at Surak-ri, Nonsan-gun, Chungnam Province was explained by major ion concentration, water type, and phase stability diagram. The area is composed of meta-sedimentary rock and quartz pophyry. The 5 boreholes where deep groundwater was sampled and analyzed are located on the meta-sedimentary rocks and drilling depth range of the wells is from 554 m to 928 m. pH, TDS, Na, and SiO2 values are high in the groundwater from meta-sedimentary area intruded by quartz pophyry, while Ca is high in the groundwater from meta-sedimentary area. K and Mg concentrations are low but F concentration is high both groundwater. The content of major anions is in the order of CO3(HCO3)>Cl>SO4(F) in both geology, while that of major cations shows the order of Na>Ca>K(Mg) in meta-sedimentary area intruded by quartz porphyry and a>Na>Mg>Na in meta-sedimentary area. Based on the phase equilibrium in the systems Na2O-Al2O3-SiO2-H2O and K2O-Al2O3-SiO2-H2O, the groundwater is saturated with respect to Quartz and more evolved compared with the natural mineral water. It is concluded that chemical evolution in the groundwater from meta-sedimentary area intruded by quartz porphyry, is nearly saturated with respect to feldspar, while the groundwater from meta-sedimentary area continue to proceed with increasing pH by reaction of feldspar.

• 한국가금학회지
• /
• 제43권4호
• /
• pp.213-218
• /
• 2016

본 연구는 고온 스트레스 하에 타우린 첨가가 육계의 간에서 heat shock protein 70(hsp 70) 및 cell free system 상태에서 단백질 합성에 미치는 영향을 조사하였다. 공시동물은 1일령 육계 120수를 2주간 사육 후, 대조(CO, $24^{\circ}C$)와 고온스트레스 처리($34^{\circ}C$)에서 타우린을 공급하지 않은 처리구(HO)와 타우린 0.1%를 공급한 처리구(HT)로 나누어 3처리 4반복, 반복 당 10수씩 배치하였다. 고온 스트레스는 3, 6, 9, 12일간 진행하였다. 최종 체중과 간 무게는 HO와 HT가 CO보다 유의적으로 낮았다(P<0.05). 그러나 타우린을 첨가한 HT은 HO보다 유의적으로 높았다(P<0.05). 육계 간에서 hsp70 발현은 HO가 CO와 HT보다 유의적으로 높았으나(P<0.05), CO와 HT는 유의적인 차이가 없었다. In vitro 실험에서 고온 및 타우린은 21일령 육계 간의 총 단백질 합성률에 영향을 미치지 않았다. 따라서 타우린 섭취가 in vivo 육계의 성장에서 고온 스트레스를 완화시키지만, 생체 내의 단백질 합성에 직접적인 영향을 미치지 않는 것을 보이며, 이러한 결과는 타우린이 다양한 생리학적 기전을 통해 단백질 turnover 대사에 간접적으로 영향을 미칠 수 있다는 것으로 사료된다.

• Bulletin of the Korean Chemical Society
• /
• 제32권6호
• /
• pp.2032-2038
• /
• 2011

Matrix metalloproteinases (MMPs), a family of zinc-containing endopeptidases, participate in many normal processes such as embryonic development and wound repair, and in many pathological situations such as cancer, atherosclerosis, and arthritis. Peptidomimetic MMP inhibitors were designed and synthesized with N-formylhydroxylamine (retrohydroxamate) as a zinc-binding group and various side chains on the ${\alpha}$, P1', and P2' positions. Using in vitro MMP assays with purified MMPs (MMP-1, MMP-2, MMP-3, MMP-9, and MMP-14) and fluorogenic peptide substrates, it was found that compounds 2d and 2g selectively inhibit gelatinases (MMP-2 and MMP-9) and interstitial collagenase (MMP-1). They also inhibited the chemo-invasion of fibrosarcoma HT-1080 cells and tube formation of human umbilical vascular endothelial cells in a dose-dependent manner. Our results suggest that retrohydroxamate-based MMP inhibitors, especially compounds 2d and 2g, have the potential to be used as therapeutic drugs for cancer and other MMP-related diseases.

• Journal of Microbiology and Biotechnology
• /
• 제14권6호
• /
• pp.1249-1255
• /
• 2004

This study has developed Corynebacterium ammoniagenes (c. ammoniagenes) purine gene transcriptional reporters (purF-lacZ and purE-lacZ) that function in Escherichia coli (E. coli) DH5a. After transformation of a C. ammoniagenes gDNA library into E. coli cells harboring either purF-lacZ or purE-lacZ, C. ammoniagenes clones were obtained that repress purF-lacZ and purE-lacZ gene expression. The potential purE and purF regulatory genes are homologous to the genes encoding transcription regulators, the regulatory subunit of RNA polymerase, and genes for purine nucleotide biosynthesis of various bacteria. The C. ammoniagenes purE-lacZ and purF-lacZ reporters were repressed by adenine and guanine within E. coli, indicating similarity in the regulatory mechanism of purine biosynthesis in C. ammoniagenes and E. coli. Gene regulation of pur-lacZ by adenine and guanine was partly abolished in cells expressing potential purine regulatory genes, indicating functionality of the purine gene regulators in repression of purE-lacZ and purF-lacZ. The purE-lacZ and purF-lacZ reporters can be used for the screening of genes involved in the regulation of the de novo synthesis of the purine nucleotides.

• Korean Chemical Engineering Research
• /
• 제53권6호
• /
• pp.667-671
• /
• 2015

Anode는 효소를 이용한 효소전극과 cathode는 PEMFC용 전극을 이용해 효소연료전지를 구동하였다. 효소 anode는 graphite 분말과 효소로서 글루코스 산화제, 전자매개체로 ferrocene을 혼합해 압축해서 만들고 Nafion 이오노머로 코팅하였다. Anode 제조조건을 변화시키며 성능을 측정해 효소 anode 제조 최적조건을 찾았다. 효소 anode 압축 시 최적 압력은 8.89 MPa이고, 효소 anode의 graphite 성분비가 60%일 때 최고의 출력밀도를 나타냈다. Anode 기질 용액의 최적 glucose 농도는 1.7mol/l이었다. 효소 anode는 Nafion 용액에 1초, 2회 침지에 의해 안정화되었다.

• 한국전기전자재료학회논문지
• /
• 제30권10호
• /
• pp.656-664
• /
• 2017

This paper presents the design and fabrication of a high power piezoelectric ultrasonic surgery unit for multi-purpose dental implantation. A conventional piezoelectric ultrasonic surgery units consists of a transducer and a tip. However, the drawback of this simple structure is that the output performance of the transducer considerably changes with the change of the tips. An ultrasonic surgery unit that has an additional booster between the transducer and the tip can solve this problem to some extent; for this, an optimal structural design for the transducer is required. We used the Bolted Langevin Transducer (BLT) as the basic transducer; it consists of piezoelectric ceramics and a metal body. It's structure was optimized using mathematical methods to determine the length and radius of the tail and head masses. Additionally, the booster was also subjected to the same methods. Using these mathematical methods, optimal results in terms of the resonance frequency (24.96 kHz), displacement ($14.27{\mu}m$), and pressure (2.8 MPa), could be obtained. The validity of this proposed surgery unit was confirmed experimentally, exhibiting a cutting force of around 7% higher than that of a conventional surgery unit.