• Current Research on Agriculture and Life Sciences
• /
• v.2
• /
• pp.56-62
• /
• 1984

This experiment was carried out to investigate the effects of distilled water, pH, uv-irradiation, carrier, emulsifier and organic solvent on the stability of butachlor formulations in the course of storage. The uv-irradiation increased the decomposition rate of butachlor formulations in the order of emulsifiable concentrate, sand coated granular and zeolite adsorbed granular. Decomposition of butachlor emulsion was not affected by water and pH. Decomposition of butachlor emulsifiable concentrate which were prepared with various organic solvents at $50^{\circ}C$ was higher in the polar organic solvents than in the non-polar organic solvent. Decomposition of butachlor-emulsifiable concentrate emulsified in Tween-60 was higher than in Hy-620C or Newkalgen-MC.

• Korean Journal of Agricultural Science
• /
• v.2 no.2
• /
• pp.381-398
• /
• 1975

Present work was executed to evaluate effects of adjuvants. stabilizers. moisture. pH and heavy metals on the stability of Fenitrothion in the emulsifiable concentrate. In addition, susceptibility ' of Fenitrothion in various formulations, to UV-irradiation has been also examined. The results are summarized as follows; 1. Xylene and benzene were found to be satisfactory solvents for Fenitrothion emulsifiable concentrate. As expected, polar sol vents such as aliphatic alcohols considerably reduced stability of the pesticides. 2. Of the two non-ionic emulsifiers, an alkyl aryl type Sorpol-1200, in contrast to sorbitan type Tweens, substantially reduced decomposition of Fenitrothion in the emulsifiable concentrates. Moisture and pH of emulsifiers. in the ranges studied. affected little if any. on the stabi ity of the Fenitrothion during the experiment periods. 3. Maleic anhydride, p-toluene sulfonic acid, sulfosalicylic acid, maleic anhydride-sulfosalicylic acid reduced decomposition of Fenitrothion in the emulsifiable concentrate. Addition of organic acids, however, increased liability of Fenitrothion in the emulsifiable concentrate. 4. Presence of either zinc or copper metals in the emulsifiable concentrate containing Tween-80 as a emulsifier, reduced stability of the Fenitrothion. 5. UV-irradiation, as expected, brought decomposition of Fenitrothion. The liability of Fenitrothion formulations decreased in the order, wettable powder ${\gg}$ dust > emulsifiable concentrate.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.41 no.3
• /
• pp.12-21
• /
• 2013

This paper deals with a comparative analysis of changes in cognition of city image of Daegu City, focusing on image of representative and environmental conditions. Two-questionnaire surveys were conducted to compare the change of image cognition between the last decades. Major results are: Firstly, the most frequent representative images of Daegu City were hot weather, Palgong Mountain, textile industry, etc. and representative places were Palgong Mountain, Dongsung-ro Street, E world(Woobang Land), etc. Compared to the results of year 2000, the frequency of apple, and textile industry were remarkably decreased. Secondly, mean scores of image rating for environmental conditions were comparatively high in human environment such as women, and kindness. By individual variables, accessibility to Daegu City, women, living environment such as shopping, showed higher mean scores. Generally, mean scores of 2011 survey were higher than that of 2000. Thirdly, major factors affecting city image were human environment, living environment, natural environment, and transportation environment, respectively. These results can be used as a basic data for strategies to improve higher brand image of Daegu City.

• Proceedings of the Korean Society for Applied Microbiology Conference
• /
• 1975.07a
• /
• pp.110.2-110
• /
• 1975

성분이 동일한 완제품간장을 3$^{\circ}C$, 15$^{\circ}C$, 5$^{\circ}C$로 각각 달리하여 밑봉과 개봉상태로 1년이상 보존하면서 경시적으로 성분의 변화및 미생물의 동태를 관찰하고 동시에 시판 간장중에 생육하는 미생물을 계측한 결과는 아래와 같다. (1) 총질소, 색도, 비중, 석염의 함량은 저장기간의 경과에 따라 증가 현상을 나타내었으며 고온(3$0^{\circ}C$, 15$^{\circ}C$), 개봉방치 상태에서는 저온(5$^{\circ}C$)밀봉방치 상태에 비하여 증가현상은 현저하였다.(중략)

• Proceedings of the Korean Society for Applied Microbiology Conference
• /
• 1986.12a
• /
• pp.532.1-532
• /
• 1986

유산균이 생성하는 polysaccharide 에 관한 연구의 일환으로서 L. casei YIT 9018 SKD-0007, L. bulgaricus SKD-0003, sir. faecalis SKD-1007, str. thermophilus SKD- 1005, str. thermophilus 510 SKD-1006등을 탈지유에 배양하면서 polysaccharide 생성에 의한 배양액의 점도 변화를 검토하였다. 이러한 다당류가 Antitumor로서의 활성과 제암효과를 가지며 인체내의 생리효과를 고양시킨다고 보고되어 있는바 다당류가 최대로 생성되는 조건을 찾는 것을 본 실험의 목적으로 하였다. 다당류의 생성을 측정하는 방법으로서 배지로는 10% 환원탈지유와 12% 환원전지유를 선택하였으며 Brookfield Viscometer를 사용하여 배양액의 점도를 경시적으로 측정하였다. 시험균 중에서 str. thermophilus 510 SKD-1006이 가장 높은 점도를 나타내었는데 41$^{\circ}C$ 배양 5일째에 5000 cps였고 다른균에 비해서 1000cps이상 높았다. 접종량이 증가할수록 점도도 증가하였으며 14%이상의 탈지유 농도에서는 7000cps를 나타냈다. 탈지유와 전지유 배양액 모두 의가소성 유체의 유동 양식을 나타내었는데 12% 환원전지유 배양액은 최대점도값이 2500 cps에 불과하였으며 배양 2일째에 최대점도 값에 도달하여 그 이후로 급격한 감소현상을 보였다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2002.07a
• /
• pp.327-332
• /
• 2002

식물조직배양용 바이오리액터내 배양액의 pH, DO 농도를 on-line으로 계측하고 제어하기 위한 시스템을 개발하여 시스템의 성능시험과 경시간격별 배양액의 농도변화를 계측하였으며, 주요 연구결과는 다음과 같다. 가. 복수의 바이오리액터내 배양액의 pH, DO 농도를 전극을 이용하여 on-line으로 계측하며, 농도의 계측값과 목표값을 비교하여 피드백으로 제어할 수 있는 시스템을 개발하였다. 나. 배양액의 농도변화를 계측한 결과 pH는 배양초기 5.0에서 배양이 경과됨에 따라 서서히 떨어져 2개월 후에는 3.8까지 떨어지는 것으로 나타났다. 다. 배양액의 성분중 배양초기에는 암모니아태 질소의 흡수가 질산태 질소보다 많이 이루어져 구근으로부터 H+이온을 유출시킴으로 pH의 값이 떨어지는 것으로 나타났다. 라 오염이 발생한 리액터내의 배양액 성분은 pH의 값이 3이하로 떨어졌으며, 이로부터 배양액의 오염경보를 할 수 있는 것으로 나타났다.

• Electrical & Electronic Materials
• /
• v.1 no.2
• /
• pp.162-167
• /
• 1988

본 논문에서는 Pb(Sn$_{1}$7/Mn$_{2}$7/Nb$_{4}$7/)O$_{3}$- Pb(Zr, Ti)O$_{3}$계에 La$_{2}$O$_{3}$를 첨가하여 그양에 따른 압전일 전기력 성질의 변화를 고찰하였다. La$_{2}$O$_{3}$ 첨가량의 증가에 따라 유전상수, 압전 d상수, 유전손실, 비저항 등은 증가하였으나 경시 변화량은 오히려 감소하였다.

• Journal of Food Hygiene and Safety
• /
• v.22 no.4
• /
• pp.268-272
• /
• 2007

A study on the evolution of acid value, peroxide value and biogenic amines in silkworm pupa during 7 days at different temperature of storage (-18, 25 and $35^{\circ}C$) was performed. Seven biogenic amines (putrescine, cadaverine, histamine, tyramine, spermidine, spermine and 2-phenylethylamine) were determined. Acid value in Silkworm pupa increased both during normal temperature $(25^{\circ}C)$ and room temperature $(35^{\circ}C)$ and thebiogenic amine (histamine, tyramine) content generally increased in $25^{\circ}C\;and\;35^{\circ}C$ with storage time. Significant differences were found (P<0.05) in the levels of tyramine and histamine among Silkworm pupa. The relationship of storage time and acid value of Silkworm pupa were resolved a simple linear equation, and histamine and tyramine could be predicted using this equation. Quality indices related to the contents of the major biogenic amines were calculated and they correlated well with physicochemical characteristics qualities such as acid value.

• Journal of fish pathology
• /
• v.7 no.2
• /
• pp.127-149
• /
• 1994

Histopathological studies on the two lymphomyeloid organs of spleen and head kidney in tilapia, Oreochromis niloticus, were carried out to clarify the significance on the morphological characteristics of melano - macrophage centers (MMCs) which are varied in different physiological and pathological conditions of teleosts. To examine the histological changes by the artificial modification of the immunological states, tilapia were treated intraperitoneally with FKC and LPS of Edwardsiella tarda, and orally with dexamethasone, and then followed by the intraperitoneal injection of colloidal carbon for chasing the macrophages. There were marked differences in phagocytic avidity of macrophages, and accumulating patterns of carbon - ladening macrophages into the MMCs among the test groups. In the non - pretreated control group, carbon - ladening macrophages were densely accumulated at 12th and 20th day within the MMCs of head kidney and spleen, respectively. And, in the groups treated with bacterial antigens (FKC & LPS), the macrophages were more rapidly and densely aggregated within MMCs. But in the group with dexamethasone, only a few carbon particles were detected in both organs. Any compactly isolated form of particles was not found in this group. From the present results, it was strongly suggested that certain changes in immunological states of tilapia influence on the morphology of MMCs including the frequency of appearance, sizes, aggregating patterns or outlines. Therefore, morphology of MMCs would be very important in the interpretation for histopathological findings seen in the teleost's lymphomyeloid organs.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.26 no.1
• /
• pp.92-97
• /
• 1997

Beverages using mountain edible herbs(MEH) were formulated by determining optimum ratio of juices of MEH to several other ingredients. Fermented beverages were made by mixing juices(1 volume) fermented with Lactobacillus helverticus with syrup(3 volumes), followed by homogenization and flavoring . The general analysis and quality change of the beverages during storage were Peformed. The analysis of the beverages showed that the pH of Synurus deltoides and Cirsium sctidens were 3.8 and 3.7, titratable acidities were 0.50 and 0.49, optical densities were 1.201 and 1.119, respectively, The pH and color were not significantly changed when Synurus deltoides and Cirsium sctidens were stored at room temperature and 37$^{\circ}C$ for 6 months. The pH of Synurs deltoides beverage ranged 3.95~3.96 and pH of Cirsium sctidens was 3.83~3.95 at room temperature and 3.87~3.98 at 37$^{\circ}C$, respectively. The analysis of fermented beverages showed that pHs of Synurus deltoides and Cirsium sctidens were 3.65 and 3.70, titratable acidities were 0.57 and 0.60. Solids-non-fat were 3.2 and 3.1, and total counts of lactic acid bacteria were 2.5$\times$10$^{8}$ and 4.0$\times$10$^{8}$ , respectively. The changes of pH and titratable acidities stored at 4$^{\circ}C$ for 15 days were 3.39~3.56 and 0.61~0.81 for Synurus deltoides and 3.48~3.67 and 0.60~0.78 for Cirsium sctidens, respectively.