• 한국연초학회지
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• 제11권2호
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• pp.143-148
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• 1989

Field experiment was conducted to find out the chemical characteristics of 12 Korean local varities, Local varities were compared with oriental, flue-cured and burley tobacco. Among tested varities, Hyangcho and Matskawa were desirable in respect of flavor, leaf color and texture. Hyangcho and Matskawa were higher in the content of nicotine and petroleum ether extract. Gajacho, Byeolcho and Kukjuo were higher in the content of reducing sugar, but lower nicotine, total nitrogen and petroleum ether extract. The nicotine and total nitrogen content of Kwangcho, Daruma and Catterton were lower than that of Br. 21. In the content of volatile organic acid which were major characteristic component of oriental tobacco, the Korean local varities were lower in the content of 3-methyl butanoic and 3-methyl pentanoic acid, but hirities, Hyangcho, Matskawa and Daruma were higher in the content of volatile organic acid. Korean local varities, especially small leaf group, were higher in the content of benzyl alcohol and furfural than any other type tobacco.

• 한국조리학회지
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• 제13권4호
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• pp.293-304
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• 2007

Using the high-pressure heating extraction process suitable for mass-production, crab stock(CS), red crab stock(RCS) and fish stock(FS) were manufactured and their quality and organic features were compared. The results are as follows. In mineral content, the content of essential amino acids, the content of delicious amino acids and preference, CS and RCS were rated higher than FS, and especially RCS had the most abundant essential amino acid content and had the highest rating in organic evaluation. Also, in terms of cost, RCS was more economical than regular CS, which is relatively expensive. Therefore, it is believed that replacing fish bones with RCS in making stock will be more cost-saving and have higher preference.

• 한국유기농업학회지
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• 제19권spc호
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• pp.275-278
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• 2011

To find an alternative for synthetic pesticides, methanol extracts from 69 plant samples were tested for their insecticidal activity against two spotted mite (Tetranchus urticae Koch). Seven plant extracts including Angelica japonica showed over 80% insecticidal activity at 5000 mg/L. Extract of Prunus armeniaca seed showed high insecticidal activity at 3000 mg/L. As a naturally occurring pesticide, P. armeniaca could be useful as a new botanic insecticide.

• 한국유기농업학회지
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• 제19권spc호
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• pp.279-282
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• 2011

This study was carried out to development the environment-friendly control method of Myzus persicae using Beauveria bassiana and Environment-friendly agricultural materials (EFAM). Germination rate the dried conidia of B. bassiana was 90 percent at $24{\sim}27^{\circ}C$ temperature condition. Mortality of M. persicae was 56.7% at $1{\times}10^7$ cfu/ml conidia concentration. Four EFAM such as Pachungtan, Wangjungwang, Newbiodakill, Muginchon were low toxicity to B. bassiana growth. Among them, Muginchon (derris extract) and Wangjungwang (neem extract) could have synergistic effect to aphid mortality when mixing treat with B. bassiana, which protection value was 99% in 3 days after treat.

• Biomolecules & Therapeutics
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• 제6권3호
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• pp.261-268
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• 1998

Propolis is a lipophilic, natural product prepared by mixing the exudates collected from various plants by honeybees with beeswax for the purpose of using to seal hive walls and to strengthen the borders of combs. Because of its versatile bioactivities, propolis has been attracting many investigators'interest. But the pharmacological studies on propolis has, to date, been exclusively performed for an alcohol extract, there is few information of water extract. Therefore, in this study, we investigated the various effects of water extract of Chinese propolis. The water extract of propolis and its fractions of organic solvents showed strong antioxidative activities, especially ether and ethylacetate fractions, and reduced the lipid peroxidation of rat liver in viro. Additionally the ether fraction of propolis (10 mg/ml) inhibited the activity of hyaluronidase by 50%. In vivo, the water extract of propolis considerably decreased s-GOT, s-GPT and s-LDH activities which represent for the hepatotoxicity induced by $CCl_4$ in rats, and prolonged the MST (Medium revival tinge) and ILS (Increasing in MST over control) by 18% in mice which inoculated with sarcoma 180 ascites cells. These results suggest that the water extract of propolis has various bioactivities as well as the alcohol extract.

• Mycobiology
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• 제39권2호
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• pp.85-91
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• 2011

We investigated the effect of nutritional and environmental factors on Ophiocordyceps longissima mycelial growth. The longest colony diameter was observed on Schizophyllum (mushroom) genetics complete medium plus yeast extract, Schizophyllum (mushroom) genetics minimal medium, and Sabouraud dextrose agar (SDA); however, malt-extract yeast-extract agar, SDA plus yeast extract, yeast-extract malt-extract peptone dextrose agar, SDA, oatmeal agar, and potato dextrose agar showed higher mycelia density. A temperature of $25^{\circ}C$ was optimum and 7.0 was the optimum pH for mycelial growth. Colony diameter was similar under light and dark conditions. Maltose and yeast extract showed the highest mycelial growth among carbon and nitrogen sources respectively. The effect of mineral salts was less obvious; however, $K_3PO_4$ showed slightly better growth than that of the other mineral salts tested. Among all nutrition sources tested, complex organic nitrogen sources such as yeast extract, peptone, and tryptone were best for mycelial growth of O. longissima. Ophiocordyceps longissima composite medium, formulated by adding maltose (2% w/v), yeast extract (1% w/v), and $K_3PO_4$ (0.05% w/v) resulted in slightly longer colony diameter. In vitro mycelial O. longissima growth was sustainable and the production of fruiting bodies could be used for commercial purposes in the future.

• 보존과학연구
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• 통권31호
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• pp.89-102
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• 2010

This study evaluated the activity of biocidal compounds isolated from natural products and confirmed applicable possibility as conservative agents for orgainic cultural heritages damaged by biological degradation. we used methanol extracts of 11 Korean trees and 17 medicinal plants as natural resources. Among these extracts, Phellodendron amurense was investigated on antifungal activity against Coniophora puteana, Lentinus lepideus, Tyromyces palustris and Aspergillus niger. Asarum sieboldii was investigated on insecticidal activity against adult of Lasioderma serricorne. First, the extract of Phellodendron amurense was partitioned into hexane, dichloromethan and ethylacetate fraction. Among them, the ethylacetate fraction had the most significant antifungal activity. In addition, Asarum sieboldii essential oil showed an effective antifungal and insecticidal activity. As a result, the extract of Phellodendron amurense and Asarum sieboldii essential oil could be useful for conservation of organic cultural heritage against biological deterioration by wood rot fungi and Lasioderma serricorne.

• Plant Resources
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• 제8권1호
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• pp.17-26
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• 2005

From the point of breeding view for our future, 20 Korean varieties of red pepper for the contents of capsaicinoids, free amino acids, free fatty acids and organic acids with powder product and eating qualities were chosen, and the sensory properties of their water and ethanol extract were compared in order to investigate the influence of the composition of test components on sensory acceptability of Korean red pepper. The composition of taste components in red pepper powder varied wildly depending on the varieties; total capsaicinoids content variety from 0.029 to $0.913\%$, free sugar 8.45 to $20.2\%$, and organic acid 4.58 to $19.54\%$. Capsaicinoid contents especially dihydrocapsaicin content, were highly correlated with pungent taste of the methanol extract of red pepper power, but did not show significant relationship to the overall sensory acceptability. However, the components analyzed here and eating and processing qualities include high variations and future breeding sources.

• 농약과학회지
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• 제20권1호
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• pp.47-55
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• 2016

본 연구는 커피박 퇴비와 벨벳콩 식물체 분말 처리에 따른 고구마뿌리혹선충 살충효과를 평가하였다. 커피박 퇴비와 벨벳콩 식물체 분말 처리중, 1% 벨벳콩 식물체 분말 처리가 뿌리혹선충의 살충율이 83.2%로 가장 높게 나타났다. 또한 실내에서 호피무늬 벨벳콩 추출물 농도별로 처리한 시간의 경과에 따라 뿌리혹선충 유충의 치사율이 증가하였다. 호피무늬 벨벳콩 추출물 처리 24시간 후, 1.2%와 2.4% 농도에서 뿌리혹선충 유충의 치사율이 가장 높게 나타났다. 커피박 퇴비와 벨벳콩 식물체 분말 처리가 호박유묘의 생육에 미치는 영향을 조사하였더니 20% 커피박 퇴비 처리구는 호박 유묘의 생육을 억제하였으나 1% 호피무늬 벨벳콩 분말 처리구가 호박 유묘의 생육촉진효과가 가장 뛰어났다. 하지만 유기성 자원인 벨벳콩과 커피박 퇴비를 이용하여 유기농 호박 재배토양에서 발생하는 고구마뿌리혹선충을 효과적으로 방제하기 위한 재료로 사용하기 위해서는 처리농도와 방법에 대한 추가적인 연구가 필요할 것으로 생각한다.

• 보존과학연구
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• 통권16호
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• pp.112-122
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• 1995

TEN-STORIED STONE PAGODA ON THE SITE OFWON-GAKSA(Temple) which is one of three marble pagodas in South Korea, were dated from the thirteenth year of the reign of King Sejo(1467). On the roof and surface of each the stories, there were large amount of the contaminants such as pigeon′s excretions, dust and environmental elements for a long time. The pH of contaminants is not acid, but is 7.2, neutral. To find the species of organic acidscontained in the contaminants and the degree of damaging for a marble pagoda, we analyzed the contaminants using GC-MSD method by the following procedures. Organic acids were extracted by saponifying whole contaminants. After Saponification, the organic acids were mathylated to increase their volatility upon subsequent GC-MSD analysis. The mathyl esters of the organic acids are extracted from the acidified aqueous solution. And the organic extracts were washed with adilute base solution. The washed extract were analyzed by GC(Hewlett Packard 5890)with a nonpolar capillary column(Crosslinked 5% Ph Me Silicone, $50×0.2㎜×0.33\mum$film thickness, USA) and Mass Spectrometric Detector(Hewlett Packard 5970B).As the result, it was found that 12 organic acids were the main compound in pagoda′contaminants, and the amount of organic acid were negligible.