• 간호행정학회지
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• 제11권3호
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• pp.289-301
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• 2005

Purpose: This study was to examine the ego-identity of nursing students and their adjustment to home and university in an effort to identify the correlation of their ego-identity to their adjustability and lay the foundation for providing better personality education to them. Method: The subjects in this study were 400 nursing students at H and S universities in south Chungcheong province. The instruments used in this study were Park A-cheong(2003)'s Korean-version Ego-Identity Inventory and Jeong Jonggweon(1998)'s Home and School Adjustment Inventory. For data analysis, SPSS/PC+ Package was used, and statistical data on frequency and percentage were obtained. Besides, t-test, one-way ANOVA and Pearson correlation coefficient were employed. Result: The findings of the study were as follows: The nursing students investigated got a 3.46 and 3.53 in ego-identity and family life adjustment respectively out of possible five points, which were both above the average. Their score in school adjustment was 2.89, which wasn't high. As for connections between general characteristics and ego-identity, their academic school year, their type of residence, presence or absence of parents and their birth order made no statistically significant differences to their ego-identity. But as to motivation of choosing nursing, the students who chose their major at their own option were the best in that regard. Their adjustment to family life made no significant differences, and regarding school adjustment, ego-identity was better among those who lived in a lodging house or dormitory(F=4.01, p<.05) and who chose their major at their own option(F=4.88, p<.01). In addition, those with better ego-identity were better adjusted to home and school. Conclusion: As the above-mentioned findings suggested that nursing educators should teach students by mapping out specific plans to enhance the ego-identity of students and facilitate their school adjustment, and full-fledged nurses should be produced by teaching students to build the right work ethics and become qualified as a professional.

• Journal of Animal Science and Technology
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• 제45권5호
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• pp.725-730
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• 2003

This study was conducted to evaluate the adequacy of an alternative a.m.-p.m. testing scheme for milk yield in comparison with the official test method based on weighing two milkings within 24 h. A total of 8,309 p.m. milking weights and 6,767 a.m. milking weights from 72 Holstein cows raised at N.L.R.I. were collected between October 2000 and November 2001. Ratios were computes for daily milk yield to a.m. and p.m. milking weights(direct yield ratios) and ratios of a.m. and p.m. milking weights to daily milk yield (inverse yield ratios). Analysis of variance indicated that the milking interval is the most important source of variation for yield ratios. Adjustment factors for estimating daily milk yield from single milking weights were derived through regression analysis of direct and inverse yield ratios on the length of the milking interval. Daily milk yield was estimated more precisely and accurately when adjustment factors were used than when single milking weights were doubled. In conclusion, alternative recording of a.m. and p.m. milking weights led to reliable estimates of milk yields.

• 식물병연구
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• 제18권2호
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• pp.117-122
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• 2012

감자 더뎅이병 방제에 대한 토양 pH 조절의 효과를 더뎅이병에 감염된 포장에서 2006년 평가하였다. 원래 pH가 5.7이었던 토양을 pH 5.0, 6.0, 6.5로 조절하고자 유황(42 kg/10a)과 소석회(81.6 kg/10a, 184.5 kg/10a)를 처리하였고 석고(522 kg/10a)도 토양 pH와 더뎅이병 발생에 미치는 영향을 구명하고자 처리하였다. 유황처리구의 토양 pH는 괴경형성기에 5.13, 수확기에는 5.01로 지속적으로 감소하였다. 또한 괴경의 발병도는 22.8%로 상대적으로 낮았으며 90.5%의 높은 상품수량을 나타내었다. 반면 소석회를 81.6 kg/10a과 184.5 kg/10a 처리한 구의 토양 pH는 수확기에 6.06과 6.49로 증가하였고, 각각 51.0%와 61.1%의 높은 발병도와 55.7%와 37.0%의 낮은 상품수량을 보였다. 한편 석고처리구는 수확기까지 토양 pH의 변화가 거의 없었으며 발병도와 상품수량도 무처리구와 유의적인 차이가 없었다. 감자 더뎅이병의 방제를 위하여 윤작작물을 2005년부터 2007년까지 재배하고 2008년에 감자를 재배하였다. 3년 윤작 후의 발병도는 파, 콩, 옥수수, 배추 시험구에서 각각 13.1%, 16.7%, 28.9%, 30.2%로 감자 연작구의 73.1%에 비해 상당히 낮았으며 상품수량도 이와 유사한 경향을 보였다. 본 연구 결과에서 살펴본 바와 같이 토양 pH의 조절과 윤작은 감자 더뎅이병 방제를 위해 단장기적으로 활용될 수 있을 것으로 판단된다.

• 한국환경과학회지
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• 제21권10호
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• pp.1255-1263
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• 2012

Batch cultivations were performed to evaluate the influences of the initial pH condition on mesophilic and thermophilic acidogenic fermentation with food waste recycling wastewater. In both conditions of mesophilic and thermophilic fermentation, TVFAs production rates were maximized at the initial pH 7 condition as 0.15 and 0.23 g TVFAs/L hr, respectively. And pH was also maintained stably between 6 and 7 during 72hr acidogenic cultivation at both conditions. However, predominant VFA components were different according to reaction temperature conditions. In mesophilic condition, propionic acid which has low conversion efficiency to methane was accumulated up to 1,348 mg/L while acetic and butyric acid were predominant in thermophilic condition. Therefore, thermophilic acidogenic fermentation was superior for the effective VFAs production than mesophilic condition. From the DGGE analysis, the band patterns were different according to the initial pH conditions but the correlations of the each band were increased in similar pH conditions. These results mean that microbial communities were certainly affected by the initial pH condition. Consequently, the adjustment of the initial pH to neutral region and thermophilic operation are needed to enhance acidogenic fermentation of food waste recycling wastewater.

• 동아시아식생활학회지
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• 제13권2호
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• pp.136-144
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• 2003

다슬기분말(PBS)과 그 회분(ABS)으로 제조한 칼슘락테이트(CaL-A및 CaL-P를 0.5%되게 첨가한 반죽의 발효와 빵의 품질 및 저장성에 미치는 영향을 조사하였다. 칼슘락테이트를 첨가하여 1차발효시킨 후 반죽의 pH는 5.98~5.86으로 대조군의 5.50보다 높았다. 반죽의 부피와 빵의 loaf volume index는 CaL-A 첨가군이 대조군 보다 현저하게 낮았으나 pH를 5.5로 조정한 후의 반죽부피와 빵의 loaf volume은 대조군과 비슷하였다. 처리군의 칼슘함량은 39.36~49.70 mg/100 g으로 대조군(13.43 mg/100 g)보다 현저하게 높았다. 처리군 빵의 색상은 대조군과 유의적인 차이가 없었다. 빵의 경도와 점착성은 CaL-A 첨가군이 대조군에 비해 높고, 탄력성과 응집성은 낮았으나 pH를 5.5로 조정한 경우는 유의적인 차이가 없었다. 처리군 빵의 현미경 관찰결과 대조군에 비하여 기공이 작고 air cell이 크며 표면이 거칠었다. 맛, 색상, 냄새 및 종합적인 기호도를 평가한 결과 대조군>CaL-A>CaL-P 순으로 첨가군의 관능적 품질이 낮았다. 그러나 pH를 5.5로 조정하여 제조한 빵에서는 종합적인 기호도가 크게 향상되었다. 칼슘락테이트를 첨가한 빵은 곰팡이 발생이 지연되었으며 곰팡이의 발생정도로 평가한 2$0^{\circ}C$에성의 저장수명은 대조군이 1, CaL-A 첨가군 3일, CaL-P 첨가군은 5일이었다.

• Preventive Nutrition and Food Science
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• 제17권2호
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• pp.166-171
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• 2012

6-Shogaol, a dehydrated form of 6-gingerol, is a minor component in ginger (Zingiber officinale Roscoe) and has recently been reported to have more potent bioactivity than 6-gingerol. Based on the thermal instability of gingerols (their dehydration to corresponding shogaols at high temperature), we aimed to develop an optimal process to maximize the 6-shogaol content during ginger extraction by modulating temperature and pH. Fresh gingers were dried under various conditions: freeze-, room temperature (RT)- or convection oven-drying at 60 or $80^{\circ}C$, and extracted by 95% ethanol at RT, 60 or $80^{\circ}C$. The content of 6-shogaol was augmented by increasing both drying and extraction temperatures. The highest production of 6-shogaol was achieved at $80^{\circ}C$ extraction after drying at the same temperature and the content of 6-shogaol was about 7-fold compared to the lowest producing process by freezing and extraction at RT. Adjustment of pH (pH 1, 4, 7 and 10) for the 6-shogaol-richest extract (dried and extracted both at $80^{\circ}C$) also affected the chemical composition of ginger and the yield of 6-shogaol was maximized at the most acidic condition of pH 1. Taken together, the current study shows for the first time that a maximized production of 6-shogaol can be achieved during practical drying and extraction process of ginger by increasing both drying and extracting temperatures. Adjustment of pH to extraction solvent with strong acid also helps increase the production of 6-shogaol. Our data could be usefully employed in the fields of food processing as well as nutraceutical industry.

• 상하수도학회지
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• 제21권6호
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• pp.745-753
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• 2007

By struvite and hydroxyapatite crystallization, was high concentration of nitrogen and phosphorus in wastewater simultaneously. Particularly, removal of nitrogen and phosphate for crystallization have been applied to landfill leachates and animal wastewater. The purpose of this study is to decide the optimum struvite crystallization factors, sequence of $Mg^{2+}$ addition, pH control and the molar ratio of $Mg^{2+}$ over $PO_4^{3-}$. In conclusion, dosage of the magnesium followed by pH control formed magnesium hydroxide, so pH was decreased. Therefore, pH adjustment should followed by after magnesium dosage and then pH should be adjusted to 11. Over pH 10, it was not good for struvite crystallization efficiency by side reaction. Following of the $Mg^{2+}$ and the $PO_4^{3-}$ are dosed excessively, the removal efficiency of the $NH_4^+$ increased. A molar ratio of $Mg^{2+}:NH_4^+:PO_4^{3-}$, 1.3:1:1.3 was the most on effective for $NH_4^+$ removal at pH 9.5. But for the perfect removal $NH_4^+$, it is thought to be that molar ratio should be 2:1:2.

• Archives of Pharmacal Research
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• 제9권3호
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• pp.163-167
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• 1986

Twenty six urea analogues, most of which have already been approved for human use, were tested for their antiurease activity in vitro. Cell-free extracts obtained from a clinical isolate of Proteus mirabilis was used as the source of enzyme. Acetohydroxamic acid which is a proven potent urease inhibitor but not approved for human use was again shown to be the most active compound among the tested. Phenacemide, cycloserine, and deferoxamine were demonstrated to be moderate inhibitors. Oxtetracycline, trimethoprim, and cefamandole revealed a demonstrable antiruease activity, but only at very high concentrations. The antiurease activity of cycloserine, trimethoprim, and cefamandole was pH dependent-only active at acidic pH. The inhibitory activity of acetohydroxamic acid however was independent of change in pH. The inhibitory activity of acetohydroxamic acid however was independent of change in pH. Hydrogen ion concentration plays an important role in urease activity and acidification (pH 5. 5) alone eliminates approximately 65% of the enzymic activity. Adjustment of pH therefore appears to be an important adjunct in reducing unrease activity and should always be studied to maximize the effcacy of antiurease compounds under investigation.

• 환경위생공학
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• 제12권3호
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• pp.73-79
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• 1997

This research was intended as an investigation of applying Reduced Pressure Evaporation as efficient treatment method for landfill leachate. According to the variance of time, temperature, pressure and pH in experiments, the properties of leachate treatment are follows. The removal efficiencies of COD, NH$_{3}$-N, TOC, Conductivity and SS on the basis of reaction time was 96.4%-97.5%, -1.4%-53.7%, 81.7%-89.0%, 92.0%-95.3% and 99.86%-99.97%, respectively. When the pH of Influent was 7.5, the pH of effluent was increased to 10-11 with time elapse. It is concluded that the orgin of pH increase may be ammonia. When the properties of concentrate were investigated at the concentration ratio 90%(V/V), concentration difficiency represented in the ratio of experimental value/calculated value had following orders ; COD>TOC>NH$_{3}$-N>Conductivity>SS. Concentrate had good precipitation because of additive thermal treatment in the process. When evaporation experiments with pH adjustment of 4.0, 6.0, 7.5, 9.0 and 10.0 were performed ; Acidic evaporation experiments(pH 4.0, 6.0) showed low removal efficiency(81.6, 87.6%) of COD and high removal efficiency (97.5%. 84.6%) of NH$_{3}$-N at initial evaporation. Basic evaporation(pH 9.0, 10.0) showed high removal efficiency (97.2%, 98.9%) of COD and very low removal efficiency (-7.4%, -27.2%) of NH$_{3}$-N at initial evaporation.

• 한국식품과학회지
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• 제18권2호
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• pp.124-129
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• 1986

본 연구는 분리대두단백으로 대두젖산균음료를 제조하여 안정제와 pH조절에 의한 커드의 침전 억제 효과를 관찰하고 미생물학적인 저장성을 조사한 것으로서 그 결과를 요약하면 다음과 같다. 대두젖산균음료의 커드는 최초 24시간 동안에 상당한 침전을 보였으며, 여기에 첨가된 CMC(0.6%이상) 또는 PGA(0.2%이상)에 의하여 커드의 침전이 현저하게 억제되었고, pH를 대두단백질의 등전점에서 멀리함에따라 커드의 침전이 다소 지연되었다. L. acidophilus로 만든 대두젖산균음료를 $5^{\circ}C$에서 48일간 저장한 경우, 젖산균수는 거의 변화가 없었으며 산생성량은 완만한 증가를 보였다. $25^{\circ}C$의 경우 산생성이 다소 높았고 생균수는 급격한 감소를 보였다. 한편 L. bulgaricus로 만든 대두젖산균음료의 경우, $25^{\circ}C$에서의 산생성량은 L. acidophilus보다 현저하게 높았으며 생균수는 $5^{\circ}C$와 $25^{\circ}C$ 두 경우 다 다소 감소하는 경향을 보였다.