• 한국대기환경학회지
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• 제22권1호
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• pp.25-33
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• 2006

The objective of this research is to improve the adsorption capacity of adsorbent made from MSWI (Municipal Solid Waste Incinerator) fly ash by surface oxidation. Used oxidation agents were $HNO_{3}$, $H_{2}SO_{4}$ and $(NH_{4})_{2}S_{2}O_{8}$. These agents can modify the surface property of an adsorbent such as specific surface area, pore volume, and functional group. The surface structure was studied by BET method with $N_{2}$ adsorption. The acid value and base value were determined by Boehm's method. The adsorption properties were investigated with benzene and MEK (Methylethylketone). According to the results, the specific surface area of the adsorbent was increased from 309.2 $m^{2}$/g to 553.2 $m^{2}$/g by $HNO_{3}$ oxidation. But $H_{2}SO_{4}$ and $(NH_{4})_{2}S_{2}O_{8}$ oxidation was decreased slightly. After Oxidation, surface acid value increased, but base value decreased. FAA-N shows the highest acid value. The content of oxygen increased greatly and oxygen group was created on the adsorbent surface. The surface oxidation improved the adsorbing capacity for MEK. The amount of adsorbing MEK was increased from 189 $m^{2}$/g to 639 $m^{2}$/g by $HNO_{3}$ oxidation.

• 한국식품조리과학회지
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• 제23권1호통권97호
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• pp.41-49
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• 2007

The substitution effects of whey protein isolate(WPI) for egg in the preparation of sponge cake were determined by objective and subjective tests. Milk whey is drained from milk curd as a by-product of cheese manufacture. Whey protein is known as a good nutritional source and a functional material for many processed foods, especially baked goods. WPI contains above 90% whey protein. The specific gravity and viscosity of sponge cakes tend to be affected by WPI substitution. The cooking loss of sponge cakes with WPI substituted for egg(abbreviated as WPI cake) during oven baking was smaller than that made with egg(abbreviated as egg cake) and the specific loaf volume of WPI cake was larger than that of egg cake. The number of pores was highly increased and the size of pores was more uniformly and finely distributed in the cross section of WPI cake than those of egg cake, as observed by scanning electron microscopy(SEM). The hardness, gumminess and chewiness of WPI cake made with 10-20% WPI substitution were the lowest among all the tested cakes, including egg cake, thereby confirming the considerable improvement in their cake qualities. By the results of sensory evaluation, appearance, pore uniformity, softness, chewiness, moistness, flavor, mouth feeling, and overall acceptability of 10-20% WPI substitute cakes were evaluated as being significantly superior to those of all other cakes(p<0.05). These results support the better physicochemical characteristics and sensory evaluations of sponge cake prepared with 10-20% of WPI substitution for egg.

• Carbon letters
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• 제18권
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• pp.49-55
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• 2016

Refuse-derived fuel (RDF) produced using municipal solid waste was pyrolyzed to produce RDF char. For the first time, the RDF char was used to remove aqueous copper, a representative heavy metal water pollutant. Activation of the RDF char using steam and KOH treatments was performed to change the specific surface area, pore volume, and the metal cation quantity of the char. N₂ sorption, Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES), and Fourier transform infrared spectroscopy were used to characterize the char. The optimum pH for copper removal was shown to be 5.5, and the steam-treated char displayed the best copper removal capability. Ion exchange between copper ions and alkali/alkaline metal cations was the most important mechanism of copper removal by RDF char, followed by adsorption on functional groups existing on the char surface. The copper adsorption behavior was represented well by a pseudo-second-order kinetics model and the Langmuir isotherm. The maximum copper removal capacity was determined to be 38.17 mg/g, which is larger than those of other low-cost char adsorbents reported previously.

• 대한치과의사협회지
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• 제57권3호
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• pp.149-160
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• 2019

Atrophic alveolar ridge of maxillary anterior area is commonly observed after the extraction of teeth in patients with severely compromised periodontal disease, causing difficulties with implant placement. Successful esthetics and functional implant rehabilitation rely on sufficient bone volume, adequate bone contours, and ideal implant positioning and angulation. The present case report categorized the ridge augmentation techniques using guided bone regeneration (GBR) on the maxillary anterior site by Seibert classification. Case I patient presented for implant placement in the position of tooth #11. The alveolar ridge was considered a Seibert classification I ridge defect. Simultaneous implant placement and GBR were performed. Eight months after implantation, clinical and radiological examinations were performed. Case III patient presented with discomfort due to mobility of the upper maxillary anterior site. Due to severe destruction of alveolar bone, teeth #11 and #12 were extracted. After three months, the alveolar ridge was considered a Seibert classification III ridge defect. A GBR procedure was performed; implantation was performed 6 months later. Approximately 1-year after implantation, clinical and radiological examinations were performed. During the whole treatment period, healing was uneventful without membrane exposure, severe swelling, or infection in all cases. Radiographic and clinical examinations revealed that atrophic hard tissues and buccal bone contour were restored to the acceptable levels for implant placement and esthetic restoration. In conclusion, severely resorbed alveolar ridge of the maxillary anterior area can be reconstructed with ridge augmentation using the GBR procedure so that dental implants could be successfully placed.

• 동의생리병리학회지
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• 제17권1호
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• pp.130-135
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• 2003

Mulberry, Mori folium leaves (ML) and fruits (MF), Lycii fructus (LF), and Panax ginseng have been known to maintain normal blood sugar levels (BSL) in folk medicine. Here we investigated the effects of coated rice with these herb extract to diabetic patients. Alloxan-induced diabetes mellitus (DB) mice (80 mg/kg BW., i.v.) separated into 3 groups. One group received the extract in high dose (6.5 mg/kg B.W.), and another one group received in low dose (1.3 mg/kg B.W.) perorally for 30 days. (+) control received no extracts. (-) control received neither of them. BSL, volume of water consumed (VWC), body weights (BW) of each group were measured and compared. BSL in both of the extracts-received groups got close to normal levels on 4th week after starting the experiments. VWC also showed the same pattern. BSL in (+) control remained high through the experiment periods. BW in (+) control remained high, but those in the extracts-received groups recovered to normal levels. The clinical trials for both of healthy volunteers and DB patients, conducted in a University Hospital, also showed that the rice coated with the extracts could control the BSL. From these results, we suggest that the functional rice with herb extracts could be used as a new alimentotherapy for DB patients.

• Clinical and Experimental Reproductive Medicine
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• 제23권1호
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• pp.81-86
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• 1996

The assessment of acrosomal status is important in evaluating the ability of sperm to fertilize the egg. The acrosomal status of sperm from 47 normal volunteers with proven fertility and 167 subfertile men with not to achieve pregnancy for at least 1 year were evaluated with Acrobeads test(FUSO Pharmaceutical Industries, Ltd, Japan) using immunobeads coated with MH61 monoclonal antibody, which is specific for acrosome-reacted sperm. The mean${\pm}$SD of acrobeads score in 47 volunteer group was $2.8{\pm}0.7$, of which 46(97.9%)cases were ${\geq}$ 2. The mean${\pm}$SD of acrobeads score in 167 subfertile group was $1.7{\pm}0.8$, of which 73(79.3%)cases were ${\leq}$ 1. The aerobe ads score in subfertile group were significantly lower(r=0.294, p<0.05) than those in volunteer group. In subfertile group, acrobeads score were well correlated with the sperm density and motility(r=0.275, r=0.281, p<0.01), but not with semen volume(r=0.16) and serum hormone level(FSH r=0.084, LH r=0.036, testosterone r=0.058, prolactin r=0.006 and estradiol r=0.060)(p>0.05). Of 63 subfertile cases with normozoospermia, 22(34.9%)cases showed 0 or 1 of acrobeads score, which means to accompany with a functional defect in spite of normal morphology. As a results, Acrobeads test is not only a technically simple sensitive procedure with good reproducibility in evaluating the sperm fertilizing capacity but also an useful in the evaluation of effectiveness in the treatment of infertility and the separation of acrosome-reacted sperm in the assisted reproductive technique.

• 한국식품영양학회지
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• 제33권1호
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• pp.37-48
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• 2020

In this study, the quality characteristics and antioxidant activities of wet noodles added with doraji (Platycodon grandiflourm) powder at concentrations of 1%, 2%, 3%, and 4%, respectively, were investigated. The crude protein, crude fat, crude ash, crude fiber, and moisture contents of the dried doraji powder were 11.00%, 0.95%, 4.10%, 29.64%, and 6.21%, respectively. As the added amount of doraji powder increased, weight, volume, and water absorption of the wet noodles after cooking decreased. However, the turbidity of the soup increased. Color L values of wet and cooked noodles decreased, while a and b values increased by the addition of doraji powder. Texture measurement indicated that hardness, cohesiveness, springiness, and chewiness of the cooked noodles decreased by addition of doraji powder. The total polyphenol contents and DPPH radical scavenging activity in wet noodles added with doraji powder increased with increasing amounts of doraji powder. Finally, sensory evaluation of wet noodles added with doraji powder revealed that taste significantly decreased. However, flavor, color, texture, appearance, and overall acceptance scores for the 1% addition group ranked significantly higher than those of the other groups. In conclusion, these findings suggest that doraji powder could be used as functional food ingredients.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제40권4호
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• pp.181-187
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• 2014

Objectives: The purpose of this preliminary study is to evaluate the effectiveness of a customized, three-dimensional, preformed titanium mesh as a barrier membrane for peri-implant alveolar bone regeneration. Materials and Methods: Ten patients were recruited for this study. At the time of implant placement, all patients had fenestration or a dehiscence defect around the implant fixture. A mixture of particulate intraoral autologous bone and freeze-dried bone allograft was applied to the defect in a 1 : 1 volume ratio and covered by the preformed titanium mesh. A core biopsy specimen was taken from the regenerated bone four months postoperatively. Patients were followed for 12 months after the definitive prosthesis was placed. Results: Satisfactory bone regeneration with limited fibrous tissue was detected beneath the preformed titanium mesh. Histologic findings revealed that newly formed bones were well-incorporated into the allografts and connective tissue. New growth was composed of approximately 80% vital bone, 5% fibrous marrow tissue, and 15% remaining allograft. All implants were functional without any significant complications. Conclusion: The use of preformed titanium mesh may support bone regeneration by maintaining space for new bone growth through its macro-pores. This preliminary study presents the efficacy of a preformed titanium mesh as a ready-to-use barrier membrane around peri-implant alveolar bone defect. This preformed mesh is also convenient to apply and to remove.

• 한국조리학회지
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• 제23권2호
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• pp.181-188
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• 2017

아로니아는 항산화 성분을 풍부하게 함유하고 있는 슈퍼베리로서 그 영양학적 가치로 인해 많은 관심과 연구가 이루어지고 있다. 본 연구에서는 스펠트 밀가루에 아로니아를 첨가하여 나타나는 가공적성을 pH와 발효팽창율을 중심으로 측정하였으며, 일반인을 대상으로 아로니아 첨가에 따른 기호도를 조사하였다. 산도측정 결과, 아로니아 첨가량이 증가함에 따라 pH 값이 낮아지는 경향이 나타났다. 발효팽창률에 있어서 아로니아를 첨가한 반죽의 부피는 아로니아를 첨가하지 않은 경우보다 약간 작은 것으로 측정되었다. 아로니아를 첨가한 빵의 기호도 조사 결과, 아로니아가 3% 첨가되었을 때는 맛에서 가장 많은 기호도가 나타났다. 색깔과 향기 그리고 전반적 호감도에서는 아로니아가 6% 첨가되었을 때 가장 많은 기호도가 나타났다. 이러한 결과를 토대로 스펠트 밀가루 식빵에 대한 아로니아 성분의 적정 배합비율은 6%로 선정되었다.

• 대한임상검사과학회지
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• 제36권1호
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• pp.43-48
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• 2004

Cerebral vasoreactivity is an index of autoregulation of cerebral perfusion, and can be measured using functional images such as Xe CT, SPECT and PET in reponse to hypercapneic stimulus. In order to measure cerebral $CO_2$ vasoreactivity in routine TCD study conveniently and reliably, we devised a method of rebreathing into closed volume of reservoir bag as a hypercapneic stimulus, and applied it to 44 healthy volunteers. As a hypercapneic stimulus, we applied fitting mask connected with closed reservoir bag for about 90 seconds, and mean blood flow velocity(MBFV) and pulsatility index(PI) were evaluated at proximal middle cerebral arteries(MCA) of 50-55 mm depth, before and after the hypercapneic stimulus. Age affected the MFV and PI value showed significant and the MFV was 56.45(SD=9.75)cm/sec, while PI was 0.406(SD=0.089). As age increases the flow velocity decreased significantly whereas PI value increased(P<0.05). The vasoreactvity significantly decreased with age(P<0.05). The decrease of cerebral blood flow quantity and cerebral blood flow velocity is not only because of increase of diameter of cerebrovascular resulting from aging, but the resistance increase of small blood vessel resulting from the increase of PI & RI value is regarded. We suppose that the rebreathing method is a reliable and convenient technique as a hypercapneic stimulus in determining cerebral $CO_2$ vasoreactivity. The rebreathing method could be non-invasive and useful methods in estimation of the cerebrovascular reactivity and could be applied to the basal and follow-up evaluation of the cerebrovascular reserve of the ischemic stroke patients.