• 대한한의학회지
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• 제30권2호
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• pp.117-126
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• 2009

Objectives: This study was performed to investigate the effects of Semen Persicae (SP) on infarct volume, COX-2 protein expression in the middle cerebral artery occlusion (MCAo) rats. Methods: Twenty-eight rats were randomly assigned to four groups (MCAo experimental group, MCAo control group, sham experimental group, control group). The middle cerebral artery (MCA) was occluded in the MCAo group by proximal focal cerebral ischemia rat model, while the MCA was not occluded in the sham group. SP extraction was administrated for 4 days to each experimental group. Neuroprotective effects were investigated by measurement of brain damage using 2, 3, 5-triphenyltetrazolium chloride staining and analysis of COX-2 protein expression by western blotting. Results: The occurrence of infarct volume in the SP oral administration group decreased compared to the control group. COX-2 protein expression in the SP oral administration group decreased compared to the control group. Conclusions: The present study demonstrates the effect of SP in reducing infarct volume and decreasing COX-2 expression.

• 분석과학
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• 제6권3호
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• pp.283-288
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• 1993

기체 크로마토그래피를 이용하여 과수 재배용 살균제인 nuarimol의 분석을 위한 최적 조건을 조사하고 사과 중에서의 잔류성을 규명하였다. 사과시료를 methanol로 추출, 여과한 후 4.00% NaCl과 dicholromethane액으로 분리농축하고, alumina 컬럼상에서 1-chlorobutane과 methanol 혼합액으로 정제하여 GLC/ECD로 분석하였다. 0.200와 1.00ppm 표준물 첨가 실험결과 평균 회수율이 79~95%였고, 사과 중 nuarimol의 잔류량은 수확 3일 전 8회 처리시 0.0830ppm이었다. 사과에 대한 안전 사용기간은 수확 7일전 6회 사용이 적당한 것으로 나타났다.

• 자원리싸이클링
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• 제2권4호
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• pp.27-32
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• 1993

제강더스트 중에 미량으로 함유되어 있는 갈륨을 분리 회수하는 프로세스를 연구하였다. 2.25mol/l-$H_2SO_4$ 침출에의하여 38mg/l의 갈륨을 함유하는 수용액을 얻었다. 이 침출액 중에서 1000배 량의 철과 아연이 함유되어 있다. 침출액 중의 갈륨은 철(III)이온을 철(II)이온으로 환원하고, pH 조정한 후, 아미노카르본산형 관능기를 가진 킬레이트 수지를 이용하여 흡착 농축하였다. 1.5mol/l-$H_2SO_4$에 의한 용리액을 칼럼에 재공급하고 재농축하여, 3.0mol/l-HCl을 이용하여 용리하였다. 용리액 중의 갈륨은 13g/l의 농도를 나타내었다. 갈륨의 정제는 용매추출법에 의하여 정제하였다. 추출제로는 TOMAC(tri-n-octhylmethylammonium chloride)을 사용하여 순수한 갈륨 정제액을 얻었다.

• 한국작물학회지
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• 제44권1호
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• pp.78-85
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• 1999

To investigate kernel hardness, a compression test which is widely used to measure the hardness of individual kernels as a physical testing method was made simultaneously with the measurement of friabilin (15KDa) which is strongly associated with kernel hardness and was recently developed as a biochemical marker for evaluating kernel hardness in 79 Korean wheat varieties and experimental lines. With the scattered diagram based on the principal component analysis from the parameters of the compression test, 79 Korean wheat varieties were classified into three groups based on the principal component analysis. Since conventional methods required large amount of flour samples for analysis of friabilin due to the relatively small amount of friabilin in wheat kernels, those methods had limitations for quality prediction in wheat breeding programs. An extraction of friabilin from the starch of a single kernel through cesium chloride gradient centrifugation was successful in this experiment. Among 79 Korean wheat varieties and experimental lines 50 lines (63.3%) exhibited a friabilin band and 29 lines (36.7%) did not show a friabilin band. In this study, lines that contained high maximum force and the lower ratio of minimum force to maximum force showed the absence of the friabilin band. Identification of friabilin, which is the product of a major gene, could be applied in the screening procedures of kernel hardness. The single kernel analysis system for friabilin was found to be an easy, simple and effective screening method for early generation materials in a wheat breeding program for quality improvement.

• 공업화학
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• 제7권3호
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• pp.453-463
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• 1996

$NH_4Cl$을 염소화제로 사용하여 시약 PbS와 Pb함유 자연광물인 방연광의 염소화 반응에 대해 조사하였다. 방연광의 적정 염소화 반응조건은 반응온도 $425^{\circ}C$, 방연광에 대한 $NH_4Cl$의 무게비 4.0, 반응시간 2시간이었다. 이 조건하에서 방연광중의 PbS는 $NH_4Cl$에 의해 효과적으로 $PbCl_2$로 염소화되었으며 그 전화율은 90%였다. 방연광의 염소화 반응에서 염소화제로 사용한 $NH_4Cl$은 $NH_3$와 HCl로 효과적으로 분리되었으며 양론적으로 90%의 $NH_3$를 회수할 수 있었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 추계 학술논문 발표대회
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• pp.29-32
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• 2005

Recently, for the problem solution of demand and supply imbalance of fine aggregate due to the shortage of natural fine aggregate and the environment regulation on sea sand extraction in the construction field, the studies for the application of recycled fine aggregate using waste concrete are being progressed versatilely. The purpose of this study is to investigate quality of recycled fine aggregate manufactured by drying manufacturing system which is the manufacture method of high duality recycled fine aggregate, and to analyze on thehardened and durability properties of recycled concrete using it. Therefore it is to present the fundamental data for application and utilization of recycled concrete. The results of this study are as follows; Quality of recycled fine aggregate by drying manufacturing system is improved, and compressive strength, carbonation depth and chloride ion penetration depth of recycled concrete using high quality recycled fine aggregate are similar to those of normal concrete using natural and crashed sand. But, resistance to $H_{2}SO_{4}$ show decreased somewhat.

• Bulletin of the Korean Chemical Society
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• 제32권3호
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• pp.768-778
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• 2011

Calixpyrroles and related macrocycles are non-planer synthetic anion receptors that have attracted considerable attentions in recent years. Although the synthesis of calix[4]pyrrole (known as meso-octamethylporphyrinogen) was reported more than 100 years ago, the anion binding properties were first discovered in 1996. The simple calix[4]pyrroles can be synthesized in single step in high yield by condensation of pyrrole with acetone. The compounds showed preferential binding for halide anions including fluoride, phosphate, carboxylate, and chloride in organic media. Efforts to improve the anion affinity of calix[4]pyrrole and to enhance its selectivity have led to the synthesis of a variety of new calixpyrrole derivatives. Among the various modifications, introduction of straps on one side of the calix[4]pyrroles are the most effective. Incorporation of aromatic rings other than pyrroles also exhibited interesting binding behaviour. Introduction of signalling units as part of the strapping element enable to detect the anions on chromogenic or fluorogenic fashion. Finding of the anion transport properties across the membrane and cytotoxic effects of the calix[4]pyrroles open new window for calixpyrrole-related research. The polymer-incorporated systems have also been employed as anion complexants in solvent-solvent extraction. These old, yet easy-to-make macrocycles have well advanced more recently with the discovery of the ion-pair complexation properties. In this review, the synthetic developments and anion binding properties of calixpyrroles for the last decades will be discussed and will cover the advances in calixpyrrole chemistry.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제21권1호
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• pp.81-88
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• 1999

A fibrin adhesive have been widely used in oral and maxillofacial surgery for microvascular anastomosis, autogenous chip bone grafts, many kinds of soft tissue surgery (vestibuloplasty, bleeding control after extraction, primary healing by covering of suture of a gum after the extirpation of large cysts). There are two principal components in adhesive systems biologically: lyophilized human fibrinogen and bovine thrombin. The fibrinogen component contains coagulation factor XIII and enhance the initial wound healing, which polymerizes soluble fibrin monomers into an insoluble clot. The thrombin is dissolved in a solution of calcium chloride to provide the second component. We applied fibrin adhesive, Beriplast (Behring, Behringwerke AG, D-3350, Marburg, FRD), to 4 patients for fixation of free skin grafting donors who had facial scar around eye, nose, mouth corner which received from accidents, or burn. We have experienced initial accelerated graft fixation between donor and recipient sites with no additional fixation. And It's made easy bleeding control and easy manipulation during operation. But two cases showed partial hypertrophic scar engrowth in above 3 months follow up, but no significant. Histopathological reviews in general were showed similar scar findings such as abundant collagen bundles in H&E, M/T stain, but slight positive signs in elastic and collagen antibody immunopathologic findings in hypertrophic scar cases.

• 한국식품과학회지
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• 제16권2호
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• pp.251-253
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• 1984

리파제 활성을 측정하는 간편한 방법을 개발하였다. 본 방법에 의하면 효소작용에 의해 생성된 유리지방산과 측정하는 색도와 서로 직선관계를 보였으며. 측정 범위는 long chain지방산인 경우 올레인산으로 환산하여 $0.05-1.5\;{\mu}moles$이었으며 short chain지방산인 경우 카프로인산으로 환산하여 $0.2-2.0\;{\mu}moles$의 범위였다. 본 방법의 장점은 종래의 "Copper Soap" 추출방법에서 상부 용매층 제거에 많은 시간을 소비하는 과정을 클로로포름-핵산-에타놀 혼합용매와 NaCl로 포화시킨 copper reagent를 사용하므로서 손쉽게 해결하였다.

• 한국염색가공학회지
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• 제7권4호
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• pp.87-96
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• 1995

Colorant concentrates are prepared by use of concentration method of colorants extracted from Sappan wood using met hanol. Dyeabilities and fastness properties of silk fabrics dyed with concentrate of Sappan wood are investigated.The results obtained are as follows; 1. The storage stability of colorant concentrate is poor as concentration is excess. 2. Because the colors of dyeings are different with mordants, aluminium acetate, copper acetate, chromium alum and tin chloride are used in order to obtain reddish color. 3. The optimum dyeing temperature and dyeing time are 6$0^{\circ}C$ and 60 min, respectively. 4. Dry cleaning fastness is very good, and light fastness and washing fastness are low. 5. The dyeing method is simple owing to usehess of colorant concentrate prepared without extraction of colorant every time.