• 한국가금학회지
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• 제35권1호
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• pp.57-62
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• 2008

본 연구는 유기산 복합제(lactic acid 12%, formic acid 9%, citric acid 5%, butyric acid 5% and phosphoric acid 6%) 급여가 육계의 생산성, 장기무게, 장내 융모 형태 및 혈액내 면역적 특성에 미치는 영향을 알아보기 위해 시험을 실시하였다. 사양 시험은 2일령 Arbor Acre Broiler(male) 480수를 공시하였으며, 5주간 사양 시험을 실시하였다. 시험 설계는 1) CON(기초 사료), 2) OA1(기초 사료 + 유기산 복합제 0.1%) 및 3) OA2(기초 사료 + 유기산 복합제 0.2%)로 3개 처리를 하여 처리당 8반복, 반복당 20수씩 완전 임의 배치하였다. 전체 시험 기간동안 생산성은 처리구간 유의적인 차이가 없었다. 장기 무게에서는 근위 무게가 CON 처리구와 비교하여 OA2 처리구가 유의적으로 높게 나타내었다(Linear effect = 0.034). 하지만, 비장과 소장 무게에서는 처리구간 차이를 나타내지 않았다. 혈액내 면역적 성상에서는 처리구간 차이를 나타내지 않았다. 장의 융모에서는 CON 처리구와 비교하여 OA1 처리구가 유의적으로 높게 나타났다(Quadratic effect = 0.050). 결론적으로, 본 시험의 결과 육계에 0.2% 유기산 복합제를 급여시 근위의 중량을 증가시키고, 0.1% 급여 시는 소장 융모의 길이를 증가시키는 효과가 있었다.

• 생태와환경
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• 제50권2호
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• pp.207-215
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• 2017

환경에 직접적으로 노출된 파충류의 비늘 (scale)은 생물의 서식환경, 생활사, 기초생태 등을 잘 반영하기 때문에 종의 특징을 이해하는 중요한 요소가 된다. 이에 본 연구에서는 한국에 서식하는 뱀류의 외부 형태에 따른 종적 차이를 밝히기 위해 국내 서식하는 뱀과(Colubridae) 내 6종(무자치 Oocatochus rufodorsatus, 누룩뱀 Elaphe dione, 유혈목이 Rhabdophis tigrinus, 대륙유혈목이 Amphiesma vibakari, 능구렁이 Dinodon rufozonatum, 실뱀 Hierophis spinalis)과 살모사과(Viperidae) 내 3종(쇠살모사 Gloydius ussuriensis, 살모사 G. brevicaudus, 까치살모사 G. saxatilis) 총 9종을 대상으로 등비늘, 배비늘과 인접한 최외각 등비늘, 등비늘에 형성된 용골(keel) 그리고 배비늘에 대한 크기와 형태를 비교분석하였다. 연구결과, 뱀과와 살모사과 내 뱀들 사이 비늘의 형태적인 차이는 뚜렷했으며, 이들의 섭식 유형 및 이동성을 잘 반영하는 것으로 나타났다. 능구렁이는 다른 종들과 다르게 독특한 마름모형의 등비늘을 가지고 있었으며, 배비늘의 너비/길이 비도 다른 종들과 구분되었다. 용골의 경우 무자치, 능구렁이, 실뱀에서는 발견되지 않았으며, 누룩뱀은 등비늘의 일부에서만 확인되었다. 살모사 3종 간 비늘의 형태적 차이는 기존에 알려진 3종 간 유전적인 관계와도 부합되게 나타났다.

• 대한두개안면성형외과학회지
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• 제17권4호
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• pp.211-217
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• 2016

Background: Nonsyndromic craniosynostosis is a relatively common craniofacial anomaly and various techniques were introduced to achieve its operative goals. Authors found that by using smaller bone fragments than that used in conventional cranioplasty, sufficiently rigid bone union and effective regeneration capacity could be achieved with better postoperative outcome, only if their stable fixation was ensured. Methods: Through bicoronal incisional approach, involved synostotic cranial bone together with its surrounding areas were removed. The resected bone flap was split into as many pieces as possible. The extent of this 'multi-split osteotomy' depends on the degree of dysmorphology, expectative volume increment after surgery and probable dead space caused by bony gap between bone segments. Rigid interosseous fixation was performed with variable types of absorbable plate and screw. In all cases, the pre-operational three-dimensional computed tomography (3D CT) was checked and brain CT was taken immediately after the surgery. Also about 12 months after the operation, 3D CT was checked again to see postoperative morphology improvement, bone union, regeneration and intracranial volume change. Results: The bony gaps seen in the immediate postoperative brain CT were all improved as seen in the 3D CT after 12 months from the surgery. No small bone fragment resorption was observed. Brain volume increase was found to be made gradually, leaving no case of remaining epidural dead space. Conclusion: We conclude that it is meaningful in presenting a new possibility to be applied to not only nonsyndromic craniosynostosis but also other reconstructive cranial vault surgeries.

• Progress in Superconductivity
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• 제6권1호
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• pp.84-88
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• 2004

The polycrystalline superconductor $SmBa_2$$Cu_3$$O_{x}$ is fabricated, and intergranular magnetic properties are investigated using the critical state model, from which some useful parameters such as the critical current density and the intergranular volume fraction are obtained. The curve fitting for M-H hysteresis loop shows that the intergranular critical current density of $SmBa_2$$Cu_3$$O_{x}$ / decreases in the form of ($1-T/T_{c}$ )$^{1.5}$ . The intergranular volume fraction is influenced by granular morphology. From SEM image, the grains of $SmBa_2$$Cu_3$$O_{x}$ are found to be randomly shaped. This mean:; that the intergranular volume fraction of $SmBa_2$$Cu_3$$O_{x}$ / should be smaller than those of superconductors, of which grains are plate-shaped such as Tl-based superconductor.

• 한국수정란이식학회지
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• 제18권3호
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• pp.187-193
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• 2003

본 연구는 한우에 GnRH ＋ PGF$_2$$\alpha$＋GnRH (Ov-synch)를 처리하여 배란동기화를 시켰으며, 2차 GnRH 투여후 배란시간, 수태율, 계절별 수태율, 산차별 수태율을 조사하였으며, 시험축은 2산 이상의 개체를 무작위로 선발하여 실험에 공시하였으며, 배란동기화 처리후 1회 인공수정을 실시하고 수태율을 환산하였다. 호르몬 처리방법으로는 GnRH ＋ PGF$_2$$\alpha$ ＋ Gn-RH(Ov-synch)법을 이용하였으며, 배란시간의 조사는 초음파를 이용하여 2차 GnRH 투여 후 24시간부터 31시간까지 2시간 간격으로 난소를 촬영하여 배란 여부를 조사하였다. 1. 배란동기화 처리후 24시간부터 31시간까지 2시간 간격으로 난소의 상태를 확인한 결과 28∼30시간 사이에 80%(20/25)로 가장 많이 배란된 것으로 나타났다. 2. 수태율에 있어서는 계통별 1회 수정 수태율은 고급육 계통이 48.1%(38/79)로 다소 높게 나타났다. 3. 산차에 따른 수태율은 1∼2, 3∼4산차에서 각각 44.3, 55%로 나타났다. 4. 계절별로는 여름보다는 봄과 가을에서 47.3%로 다소 높은 경향이였다.

• The Korean Journal of Physiology and Pharmacology
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• 제19권1호
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• pp.43-50
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• 2015

It has been shown that the extracts including eupatilin and quercetin-3-${\beta}$-D-glucuronopyranoside had mucoprotective effects on the esophagus and stomach through their antioxidant activities. This study was designed to investigate the anti-inflammatory effect of these flavonoid compounds in an animal model of inflammatory bowel disease induced by 2,4,6-trinitrobenzene sulfonic acid. Experimental colitis was induced by intracolonic administration of 2,4,6-trinitrobenzene sulfonic acid. Extracts including eupatilin or quercetin-3-${\beta}$-D-glucuronopyranoside were orally administered to animals 48, 24, and 1 h prior to the induction of colitis and then again 24 h later. The animals were sacrificed 48 h after by 2,4,6-trinitrobenzene sulfonic acid treatment and the macroscopic appearance of the colonic lesions was scored in a blinded manner on a scale of 1 to 10. The inflammatory response to colitis induction was assessed by measuring myeloperoxidase activity, nitric oxide production, tumor necrosis factor-${\alpha}$ expression, total glutathione levels, and malondialdehyde concentrations in the colon. The results indicated that extracts including eupatilin and extracts including quercetin-3-${\beta}$-D-glucuronopyranoside dose-dependently improved the morphology of the lesions induced by 2,4,6-trinitrobenzene sulfonic acid and reduced the ulcer index accordingly. In addition, rats receiving extracts including eupatilin and extracts including quercetin-3-${\beta}$-D-glucuronopyranoside showed significantly decreased levels of mucosal myeloperoxidase activity, nitric oxide production, tumor necrosis factor-${\alpha}$ expression, and malondialdehyde levels, and increased total glutathione levels. Extracts including eupatilin and extracts including quercetin-3-${\beta}$-D-glucuronopyranoside ameliorated the inflammatory response and colonic injury in acute colitis by decreasing oxidative stress and neutrophil activation. Extracts including eupatilin and extracts including quercetin-3-${\beta}$-D-glucuronopyranoside may inhibit acute colitis.

• 식물조직배양학회지
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• 제21권1호
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• pp.7-14
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• 1994

국내 5가지 품종의 대두 미숙배로부터 발생되는 체세포배 형성빈도와 자엽변이에 대한 2,4-D 농도의 영향을 알아보였다. 여러가지 농도의 2,4-D가 첨가된 MS 기달배지에 각 품종의 미숙배를 6주동안 암소에서 배양한 결과 '울산콩', '금산콩', '뱀콩' 및 '반청두'의 경우 1-2 mg/L 2,4-D를 첨가한 배지에서, '아주까리'는 20 mg/L 2,4-D를 첨가한 배지에서 가장 높은 체세포배 형성빈도를 보였다. 또한 횡으로 반분한 체세포배를 0.1-1 mg/L 2,4-D가 첨가된 배지에서 배양하였을 때 최고 70%의 빈도로 이차배를 형성하였다. 미숙배(접합자배)에서 유도된 체세포배의 형태는 2,4-D 농도에 따라 다르게 나타났는데 즉, 0.2 mg/L 이하의 농도에서는 하나의 자엽을 갖는 배와 나팔형보다는 두개의 자엽을 갖는 정상적인 형태가, 0.5-4 mgh 농도에서는 정상적인 형태보다는 나팔형의 체세포배 형성빈도가 높게 나타났다. 또한 체세포배의 자엽형태에 따라 식물체 재생률을 조사하기 위하여 ME 기본배지와 0.1 mg/L IAA, 1 mg/L BA, 1mg/L Gh₃ 및 0.5% 활성탄을 각각 U 기본배지에 첨가하여 16시간 광주기하에서 4주동안 배양한 결과, 식물체 재생률은 일반적으로 두개의 자엽을 갖는 정상적인 배가 하나의 자엽을 갖는 배, 나팔형 및 구형기의 체세포배에 비하여 높았으며, 특히 1 mg/L GA3를 첨가한 배지에서 가장 높은 재생률(25%)을 보였다.

• Progress in Superconductivity
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• 제13권2호
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• pp.90-96
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• 2011

We investigated the properties of artificial pinning centers of YBCO multilayer films in which $Y_2O_3$ and ZnO nanoparticles are uniformly introduced by using the pulsed laser deposition (PLD) technique. $Y_2O_3$ and ZnO nanoparticles were deposited on top of YBCO buffer layer and the density of nanoparticles was controlled by varying the number of nanoparticle layers. YBCO superconducting layers with total thickness of 250 nm were deposited on top of $Y_2O_3$ and ZnO nanoparticles. Based on analyses of the surface morphology, the transition temperature $T_c$, and the critical current density $J_c$, we discussed the difference between the two kinds of nanoparticles as flux pinning centers.

• 열처리공학회지
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• 제22권5호
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• pp.290-297
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• 2009

In case of using Asymmetric Bipolar Pulsed DC (ABPD) power generator, thin film is efficiently deposited as ions are getting higher energy by suppressing target poisoning and electric arc. In this article, the mechanical properties of CNx thin films deposited on the STS 316L were compared with DC and ABPD power generators. The CNx thin films deposited with ABPD clearly improved wear resistance by higher ratio of sp3CN as compared with DC. Nb interlayer affected to increase the value of 10N of adhesion between CNx thin films and substrate. But, CNx thin films deposited with ABPD couldn't endure to wear load and decreased wear resistance as the films were too thinner than substrate. Nevertheless the higher substrate bias energy applied to perform the dense films, it wasn't shown benefits about the wear properties from DC sputtering. But, in case of using ABPD sputtering, the wear resistance was largely improved without changing morphology despite of thin films.

• Ocean and Polar Research
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• 제24권4호
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• pp.483-490
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• 2002

Detailed investigations on both submarine and subaerial volcaniclastic deposits around Dokdo were carried out to identify geomorphologic characteristics, stratigraphy, and associated depositional processes of Dokdo caldera. Dokdo volcano has a gently sloping summit (about 11km in diameter) and relatively steep slope (basal diameter is about 20-25 km) rising above sea level at about 2,270m. We found ragged, elliptical-form of Dokdo caldera with a diameter of about 2km estimated by Chirp (3-11 kHz) sub-bottom profile data and side scan sonar data for the central summit area of Dokdo volcano. We interpreted that the volcaniclastic deposits of Dokdo unconformably consist of the Seodo (west islet) and the Dongdo(east islet) formations based on internal structure, constituent mineral composition, and bedding morphology. The Seodo Formation mainly consisted of massive or inversely graded trachytic breccias (Unit S-I), overlain by fine-grained tuff (Unit S-II), which is probably supplied by mass-wasting processes resulting from Dokdo caldera collapse. The Dongdo Formation consists of alternated units of stratified lapilli tuff and inversely graded basaltic breccia (Unit D-I, Unit D-III, and Unit D-V), and massive to undulatory-bedded basaltic tuff breccias (Unit D-II and Unit D-IV) formed by a repetitive pyroclastic surge and reworking processes. Although, two islets of Dokdo are geographically near each other, they have different formations reflecting their different depositional processes and eruptive stages.