• 한국응용과학기술학회지
• /
• 제37권4호
• /
• pp.778-785
• /
• 2020

본 연구의 목적은 포졸란의 항생제 내성균과 장내 유해 미생물 억제에 관한 체외배양 항균 활성을 조사하는 것이었다. 대조군 (CON, 포졸란 무첨가 대조군)과 DP0.3 (증류수와 포졸란 분말 0.3%를 혼합하여 제조한 배지군), DP0.5 (증류수와 포졸란 분말 0.5%를 혼합하여 제조한 배지군), PE (포졸란 분말 추출물을 이용하여 제조한 배지군)으로 구분하였다. Lacctobacillus casei 균수는 CON과 비교할 때 DP0.3 처리군에서 유의하게 높았으나 (P<0.05) 기타 처리구 사이의 차이는 없었다. Clostridium butyricum, E. coli, Salmonella typhimurium 균수는 CON과 비교할 때 포졸란 처리구가 유의하게 낮았다 (P<0.05). Clostridium butyricum, Salmonella typhimurium 균수는 DP0.3, DP0.5와 PE 사이, E. coli 균수는 DP0.5와 PE 사이의 유의차가 있었다 (P<0.05). MRSA와 VRE의 균수는 CON과 비교할 때 포졸란 처리구가 유의하게 낮았다 (P<0.05). MRSA 균수는 DP0.5와 DP0.3, PE 사이의 차이가 있었고, VRE 균수는 PE> DP0.3> DP0.5> CON 처리구 순서로 유의하게 높았다(P<0.05). 이와 같은 결과를 통해 포졸란의 항생제 내성균 및 장내 유해 미생물에 대한 항균활성이 확인됨에 따라 가축용 천연항균제, 보조사료 규산염제로써의 활용이 가능할 것으로 보인다.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2008년도 한국컴퓨터종합학술대회논문집 Vol.35 No.1 (A)
• /
• pp.223-224
• /
• 2008

• Restorative Dentistry and Endodontics
• /
• 제19권1호
• /
• pp.64-72
• /
• 1994

Zinc Phosphate Cement hand been used for about more than 100 years in luting of cast gold inlay. But many scientists had been trying to develop the new form of luting agent because the ZPC hand shown the lack of adhesiveness on the tooth structure and the toxicity to the pulp tissue. Recently many researches about the surface treatment of the cast body are being done to increase the adhesion of cement to it. The conventional Class I gold inlays were fabricated in the 20 permanent molars. After the internal surface of the cast body was sandblasted with $Al_2O_3$ particles and was tin-plated, the inlays were cemented with adhesive cement [G I cement and resin cement(Super-Bond & $Panavia_{EX}$)] and the evaluation on the adhesion pattern, adhesive strength and the fracture pattern of the adhesive cast gold inlay was compared to that of the cast gold inlay cemented conventionally with ZPC. The results were as follows : 1. The surface roughness of the cast body was increased significantly after sandblasting with the $Al_2O_3$ particles and the tin oxide layer, which was consisted of round particles, came into being. 2. The bond strength was in the order of Super-Bond, ZPC, Fuji I, $Panavia_{EX}$ group. The group cemented with Super-Bond showed statistically greater strength than the other groups(p<0.05). 3. The group cemented with ZPC was fallen apart by principal adhesion failure and that with Fuji I was by complete adhesion failure. But the group with Super-Bond showed pricncipal cohesive failure pattern and in the group with $Panavia_{EX}$, complete cohesive fracture pattern was shown and small protion of tooth structure was fractured out with cast body and the fractured surface showed the figure just as the enamel prism. 4. Various gaps were shown at the pulpal side regardless of little gap at the side walls of the cavity in all groups. Only the Super-Bond was attached to the tooth structure and the other cements were detached from both the tooth and the cast body.

• Restorative Dentistry and Endodontics
• /
• 제20권2호
• /
• pp.685-698
• /
• 1995

Temporary cement가 상아질 접착제의 접착 성능에 미치는 영향을 평가하기 위해 소의 하악 전치 100개를 사용하여 순면의 상아질을 노출 시키고 유지놀을 함유하지 않은 Nogenol 및 TempBond NE와 유지놀을 함유한 TempBond 및 산화아연 유지놀세멘트를 각각 도포하여 7일 경과 후 제거하였다. All-Bond 2 및 SuperBond C&B 상아질 접착제를 제조회사의 지시대로 사용하여 접착시킨뒤 $37^{\circ}C$ 항온조에서 24시간 보관 후 인장접착강도를 측정하고, 응집 파단율을 산정하였다. 그리고 temporary cement를 적용하지 않은 상아질면과 temporary cement를 도포하였다가 제거한 상아질면에 10% 인산 수용액 및 10% 구연산 수용액으로 각각 산처리한 상아질 표면성상과 접착실험후의 파단면을 주사전자현미경으로 관찰하여 다음의 결과를 얻었다. 1. All-Bond 2로 접착시킨 경우에 는 사용한 temporary cement의 종류에 관계없이 실험군의 인장접착강도가 temporary cement를 사용하지 않은 대조군에 비해 유의하게 낮게 나타냈으나(p<0.05), Super-Bond C&B로 접착시킨 경우에는 유의한 차이가 없었다.(p>0.05). 2. 유지놀을 함유하는 temporary cement와 유지놀을 함유하지 않는 temporary cement를 각각 적용한 실험군들의 인장접착 강도 간에는 유의한 차이가 없었다.(P>O.05). 3. 응집파단율 산정결과 All-Bond 2로 접착 시킨 경우에는 대조군에서 응집-부착성의 혼합파단양상이，실험군에서는 부착성 파단양상이 주로 나타났으나, Super-Bond C&B로 접착 시킨 경우에는 대조군과 실험군 모두에서 용접성파단양상이 우세하게 나타났다. 4. 주사전자현미경적 관찰상에서 temporary cement의 종류에 관계없이 temporary cement를 도포한후 제거하고 10% 인산 수용액 또는 10-3 용액으로 전처리한 모든 시편에서 미세한 temporary cement의 잔존물을 관찰할 수 있었다.

• 농업과학연구
• /
• 제48권3호
• /
• pp.397-412
• /
• 2021

In Experiment 1, the impact of using diets sufficient in P on the performance of weaned piglet growth with or without a super dose of phytase was investigated. One hundred and twelve piglets were randomized into four treatments with 7 replicates (4 piglets·cage^-1). Bodyweight (BW), daily gain (ADG), daily intake (ADFI) and feed conversion ratios (FCR) were measured over three weeks. Treatments included a positive control (PC) with a Ca : P ratio of 0.80 : 0.50%. and the negative control (NC) had a Ca : P ratio of 0.60 : 0.50%. The PC plus phytase was denoted as PC+, and the NC with the phytase diet was designated as NC+. The PC diet was formulated to meet or exceed the NRC (2012) standards for pigs weighing 7 - 25 kgs. Better results were obtained with the PC diet (p > 0.1) compared to the NC diet. The super dose of phytase in the PC+ diet significantly improved the overall FCR (p < 0.1). For Experiment 2, the impact of different calcium (Ca)/phosphorous (P) ratios with or without supplementation of vitamin D₃ was determined. Ninety-six piglets were randomized into four treatments with 6 replicates (4 piglets·cage^-1). The PC, NC1 and NC2 diets had ratios of 0.80 : 0.50, 0.80 : 0.45, and 0.60 : 0.45%, respectively. The fourth diet (PCV) was the PC diet fortified with vitamin D₃. Improved results were observed with the PC diet (p > 0.1) compared to the NC diets. Supplementing dietary 25-OH-D₃ in the PCV diet led to numerically higher ADG and ADFI scores with lower FCR values at the early nursery stage (p = 0.0044), but the vitamin supplement did not significantly influence the growth.

• 한국수정란이식학회지
• /
• 제17권1호
• /
• pp.23-32
• /
• 2002

본 연구는 기존의 수정란 이식기술을 다각적으로 분석하고 개선하여 한우 체내수정란의 생산 및 이식기술 체계를 확립하기 위하여 수행하였으며, 결과를 요약하면 다음과 같다. 1. 배란에 미치는 FSH analogue 간의 유의성은 인정되지 않았으나 수정률, 이식 가능 수정란 및 동결수정란 생산에는 처리간에 유의성(P<0.05)이 인정되었다. 특히, Super-OV는 Foll-tropin-V 및 Embryo-S에 비해서 이식 가능 수정란의 생산율이 유의적(P<0.01)으로 낮았다. 2. 호르몬의 투여시기에 따라 공란우의 배란정도 (P<0.1), 수정률, 이식 가능 및 동결 가능 수정란의 생산(P<0.05)은 각각 유의적인 차이를 나타냈다. 특히, 발정주기 11일차의 호르몬투여는 적합하지 않은 결과를 보였다. 3. 다배란처리후 황체의 등급에 따른 수정란의 수는 좌측 또는 우측에서 6개 이상의 황체를 보인 A등급(8.06∼9.49개)의 경우가 B, C 및 D등급(2.93 ∼6.28개)보다 유의적(P<0.01)으로 높았다

• 한국축산식품학회지
• /
• 제40권2호
• /
• pp.286-296
• /
• 2020

This study investigates the utilization of an electric-field-induced super cooling system in long-term dry aging of beef loin. Analyzed quality properties of dry-aged beef loin applied with electric field refrigeration (EFR) versus commercial refrigeration (CR). Quality properties was including aging loss, pH, water holding capacity (WHC), cooking loss, color, warner-bractzler shear force (WBSF), total plate count (TPC), and thiobarbituric acid reactive substances (TBARS). Aging loss of wk 1 EFR was significantly lower than CR (p<0.05). pH of EFR was slow change tendency compared CR. WHC of both aging methods were higher with increase in aging duration. Cooking loss of wk 1, 2, 4, and 10 EFR were significantly lower than CR (p<0.05). Lightness and redness of EFR was slow change tendency compared CR. However, yellowness of EFR was increased until wk 2, 3, and significantly decreased at wk 10 (p<0.05), but yellowness of CR was decreased until wk 3 and significantly increased with an increasing aging weeks (p<0.05). Both aging methods of WBSF was decreased with increase in aging weeks; however, wk 10 of CR was significantly lower than EFR (p<0.05). TPC after wk 3 EFR groups were significantly lower than CR groups (p<0.05), and TBARS of EFR groups were significantly lower than CR (p<0.05). The present results show that application of the EFR system for dry aging beef loin can extends its shelf life and induce changes of several aging properties in similar to commercial aging.

• Restorative Dentistry and Endodontics
• /
• 제35권5호
• /
• pp.359-367
• /
• 2010

연구목적: 본 연구의 목적은 glass ionomer cement (GIC)와 혼합된 mineral trioxide aggregate (MTA)의 생체친화성을 평가하고 이것을 MTA, GIC, IRM, SuperEBA와 비교해보는 것이다. 연구 재료 및 방법: 재료의 세포독성을 평가하기 위해 MG-63세포를 이용해 주사전자 현미경 관찰과 XTT assay를 실시하였다. 결과: 주사전자 현미경 관찰에서는 GIC와 혼합한 MTA, MTA, GIC의 표면에서 세포질 돌기를 가진 많은 세포들이 밀집되고 융합된 형태로 관찰되었다. 반면 IRM과 SuperEBA에서는 세포들의 수가 적고 둥근 양상을 보여주었다. XTT assay에서는 GIC와 혼합한 MTA에서의 세포 활성도는 모든 시점에서 MTA 또는 GIC와 유사하였다. 반면 IRM과 SuperEBA에서는 모든 시점에서 세포활성도가 다른 그룹에 비해 유의하게 더 낮았다. 결론: 본 연구에서 GIC와 혼합된 MTA는 MTA, GIC와 유사한 세포 반응을 나타냈다. 이것은 GIC와 혼합된 MTA가 MTA, GIC와 마찬가지로 좋은 생체친화성을 가진 재료라는 것을 시사한다.

• Restorative Dentistry and Endodontics
• /
• 제19권2호
• /
• pp.499-512
• /
• 1994

The purpose of this study was to evaluate the microleakage electrochemically using different retrograde filling materials, different root resection angle, and different cavity preparation instruments. 104 extracted single-rooted teeth were selected for this study. 100 teeth were used as experimental groups and four was used as controls. Anatomical crowns were resected, root canals were prepared, and the apical 2 mm of roots were removed. The experimental roots were randomly divided into five equal groups. Experimental groups : Group 1. no bevel, cavity preparation with ultrasonic instruments, amalgam filling Group 2. no bevel, cavity preparation with ultrasonic instruments, SuperEBA cement filling Group 3. no bevel, cavity preparation with ultrasonic instruments, desiccated ZOE filling Group 4. $45^{\circ}$ bevel, cavity preparation with ultrasonic instruments, amalgam filling Group 5. no bevel, cavity preparation with conventional bur, amalgam filling Microleakage was measured once a day for 30 days using electrochemical method and were analyzed statistically. The results were as follows : 1. The group with Super EBA cement filling showed the least marginal leakage from second to fourth day(p<0.05), there was no significant difference between the group with amalgam filling during eighth to eighteenth day(p>0.05), but after the nineteenth day here was a higher marginal leakage than the group with amalgam filling(p<0.05). 2. The group with desiccated ZOE filling demostrated that the highest marginal leakage, started on the eighth day(p<0.05). 3. The group using ultrasonic instrument showed lower marginal leakage than the group using bur until the nineteenth day(p<0.05), but there was no significant differnce with the group using bur after twentythird day(p>0.05). 4. The group without bevel showed lower marginal leakage than the group with bevel (p<0.05). 5. Whether bevel or nor had much more effect on marginal leakage than with cavity perparation instrument when the cavity was retrogrdefilled with amalgam(stepwise regression).

• Journal of information and communication convergence engineering
• /
• 제9권4호
• /
• pp.396-400
• /
• 2011

P2P(peer to Peer) network is a distributed network architecture composed of participants that make a portion of their resources directly available to other network participants, without the need for a central server. Currently, convergence network industry using wired and mobile are grows rapidly. So P2P protocols will be used between mobile and wired network. But current P2P protocols are focused on the wired networks only and there are no simulators for performance analysis of mobile P2P. In this paper, we design a P2P simulation system for performance analysis of P2P protocols in mobile, wired and convergence networks. It is constructed by a well-known mobile network simulator and wired based P2P protocol simulator. Finally we have implemented a smart TV test-bed using our P2P test-bed for convergence networks.