• 원예과학기술지
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• 제33권3호
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• pp.383-389
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• 2015

Chitooligosaccharide (COS), as antioxidant, extensively applied to food and juice preservation. In the present study, influences of COS on vase life and ornamental value of cut roses were investigated. Results showed that vase life of cut roses treated by COS was longer 6.4 days than one of control and ornamental character of cut roses was improved effectively by COS. The increase of vase life and ornamental value were chiefly governed by that COS improved water absorption capacity of cut roses. Besides that, COS decreased the contents of superoxide anion and hydrogen peroxide and lowered the levels of malondialdehyde in turn during the senescence process of cut roses. That was because that COS not only enhanced activities of antioxidant enzymes glutathione reductase, but also improved reduced glutathione contents in petals of cut rose. Therefore, COS could be used in commercial preservatives to improve the longevity of cut roses.

• 식물분류학회지
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• 제40권2호
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• pp.79-83
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• 2010

현호색과 현호색속의 1신종인 날개현호색이 한국의 경상북도 포항시에서 발견되어 기재하고 도해하였다. 날개현호색은 괴경의 내부 표면은 백색이고, 하측 외화판의 기부는 전저이며, 더 작은 종자를 가짐으로써, 이와 근연종인 점현호색과 뚜렷이 구별되었다.

• 동아시아식생활학회지
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• 제16권4호
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• pp.468-473
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• 2006

This study was conducted to develop pigment of flowers as a food material and the red rose(Rosa hybrida L.) was used for this study. To check the possibility of using the rose pigment as a food additive we have extracted the pigment from rose and examined all the factors (pH, temperature, free sugars, organic acids, metal ions) for stability. The results obtained are as follows: In examining the stability of the pigment, the residue of the pigment noticeably decreased with the increase of the pH and the temperature, and among free sugars (fructose, glucose, sucrose) the addition of fructose made the residue the lowest. With the addition of organic acids the samples exhibited the hyperchromic effect throughout the period of the storage. The pigment residue decreased when the amount of the metal ions increased and especially the Cu$^{2+}$ ion was most destructive.

• 한국미생물·생명공학회지
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• 제28권6호
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• pp.367-371
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• 2000

In order to develop a Korean traditional liquor using dandelion, alcohol fermentation condition was investigated. Etha-nol was produced maximally when 10% dandelion and 5% nuruk were added in cooked rice and fermented by S. cerevisiae at $25^{\circ}C$ for 10 days. The taste and nutraceutical properties of dandelion liquor with different concentra-tions(1%, 5%, 10%) of dandelion petal were compared. The dandelion-petal liquors which was brewed by addition of 1% dandelion petals into mash showed the best acceptability and its angiotensin-converting enzyme inhibitory activity was also high.

• 식물분류학회지
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• 제41권3호
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• pp.246-248
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• 2011

Triadenum breviflorum (Wallich ex Dyer) Y. Kimura in Nakai & Honda (Hypericaceae), previously known only in northeast India, China and Taiwan, was found in a few wetlands of Jeju Island in 2008. Additionally, some images online of T. breviflorum suggest that it exists in other places on the Korean peninsula but that it has been misidentified as Triadenum japonicum. This species is distinguished from the latter by white petals, inflorescence from nodes 6-11, linear to narrowly elliptic leaves, and an attenuated base. The local name Huin-kkot-mul-go-chu-na-mul implies a white flower rather than the flesh-pink color of T. japonicum. The morphological characteristics of the species are provided with photographs of the habitat.

• 소성∙가공
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• 제10권6호
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• pp.465-470
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• 2001

Hole flanging experiments are performed on flat circular plates with a hole in the center and the flangeability and fracture behaviors of TRIP steels and ferrite-Bainite duplex steels were examined. In the hole flanging, deformation by lip and petalling occurs when plates are struck by punches of various shapes and high circumferential strains induced in the target material cause radial cracking and the subsequent rotation of the affected plate material in a number of symmetric petals. In all cases, failure of the plate was due to lip fracture that results from multiple localized neckings that take place around the hole periphery where straining is most severe and a somewhat regular pattern was observed in a fracture shape. The neck characteristics in flange formation and the transition from the lip to petal mode at which fracture occurs were compared with two materials.

• 한국수학사학회지
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• 제13권2호
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• pp.49-64
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• 2000

Every real number can be expressed as a simple continued fraction. In particular, a number is rational if and only if its simple continued fraction has a finite number of terms. Owing to this property, continued fractions have been a powerful tool which determines a real number to be rational or not. Continued fractions provide not only a series of best estimate for a real number, but also a useful method for finding near commensurabilities between events with different periods. In this paper, we investigate the history and some properties of continued fractions, and then consider their applications in several examples. Also we explain why the Fibonacci numbers and the Golden section appear in nature in terms of continued fractions, with some examples such as the arrangements of petals round a flower, leaves round branches and seeds on seed head.

• Journal of Photoscience
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• 제12권3호
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• pp.163-169
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• 2005

Recent reports suggest that floral organs such as sepals, petals, stamens, and carpels are specified by quaternary MADS protein complexes with different combinations. The formation of quaternary complexes of ABCDE MADS proteins may be the molecular basis of ABCDE model for the floral organ development. The MADS complexes involved in each floral organ development seem to be conserved in at least dicot species although detailed molecular mechanism is slightly different depending on species. Even in monocot, at least rice, MADS complexes similar to those in dicot exist, suggesting that the floral organ specification by MADS protein complexes may be conserved in most of plants. The MADS protein complexes may have more specific recognition of target genes or more transcription activation ability than monomers or dimers, resulting in finely regulated floral organ development.

• Bulletin of the Korean Chemical Society
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• 제28권4호
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• pp.557-560
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• 2007

The metabolic discrimination of safflowers from various geographical origins was performed using 1H nuclear magnetic resonance (NMR) spectroscopy followed by principal components analysis. With a combination of these techniques, safflower samples from different origins could be discriminated using the first two principal components (PC) of the 1H NMR spectra of the 50% methanol fractions. PC1 and PC2 accounted cumulatively for 91.3% of the variation in all variables. The major peaks in the 1H NMR spectra that contributed to the discrimination were assigned to fatty acid (terminal CH3), lactic acid, acetic acid, choline derivatives, glycine, and safflower yellow derivatives. In this study, we suggest that various types of safflower can be discriminated using PCA and 1H NMR spectra.

• 한국자원식물학회지
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• 제22권5호
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• pp.473-476
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• 2009

한국특산식물인 가시딸기에 대한 형태학적 형질을 재검토하였다. 기존의 연구결과들과 다른 점은 잎의 양면에 털이 존재하고, 특히 주맥에는 선모가 존재한다. 털은 꽃잎과 줄기를 제외하고는 모든 부분에 존재하고, 가시는 엽병과 줄기에 존재하였다. 소엽은 3-7장이고, 열매는 적색으로 익는다.