• 한국연초학회지
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• 제23권2호
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• pp.168-178
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• 2001

Essential oil in tobacco leaves influences the taste and aroma of cigarette smoke and is important to tobacco quality. This study was conducted to investigate the change in the level of essential oil components during flue-curing process of two flue-cured tobaccos, NC82 and KEl14. Flue-curing process was divided by six steps; harvest stage, the end of yellowing stage, the middle of color fixing stage, the end of color fixing stage, the middle of midrib drying stage, full-cured stage. NC82 in each stage contained 0.28%, 0.30%, 0.35%, 0.36%, 0.40% and 0.42% essential oil, respectively, and KF114 were 0.29%, 0.31%, 0.34%, 0.36%, 0.39% and 0.41%, respectively. Almost all hydrocarbons on the basis of relative peak area were gradually increased in two varieties with curing, neophytadiene content in them was highest at the full-cured stage. Most of alcohols and esters with curing showed a declining trend, but benzyl alcohol was increased in two tobaccos. Ketones were largely increased at the midrib drying stage during the curing process, especially, the most largely increasing constituent was $\beta$-damascenone among them. The content of 2-butylterahydrofuran, heterocyclic compounds, was largely increased at tile color fixing stage. There was no considerable difference between NC82 and KFl14 at the GC profile of essential oil and the pattern of each components during flue-curing process.

• 한국식품저장유통학회지
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• 제12권4호
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• pp.411-416
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• 2005

본 연구에서는 배추김치를 종자별, 부위별, 저장조건별 유리당, vitamin C, amino acids의 함량을 분석하고 변화 경향을 조사하여 보았으며 vitamin C의 전구물질인 methionine과의 상관관계에 대한 연구를 수행하였다. 유리당의 경우 core> middle> outward 부위 순으로 높은 함량을 나타냈으며, midrib 부위의 함량이 높은 것으로 조사되었다. Vitamin U의 경우55일 배추 outward leaf 부위에서 함량이 가장 높았으며 저장기간이 증가 할수록 함량이 증가하는 경향을 나타내었다. 유리 amino acids의 함량은 vitamin U와 같이 outward leaf 부위가 전반적으로 높았으며 특히 threonine, alanine, proline이 가장 풍부한 아미노산으로 조사되었다. Vitamin U의 전구물질인 methionine의 함량은 부위별, 저장조건별 큰 차이를 보여주었으나, vitamin U 함량에 미치는 영향에 대한 뚜렷한 상관관계는 보이지 않았다.

• ALGAE
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• 제19권3호
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• pp.191-199
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• 2004

Morphological and phonological characteristics of brown alga Spatoglossum crassum Tanaka new to Korea were described based on the field and the indoor cultured plants. The taxonomic characteristics of the plants were agreed to those from the type locality-submerged reproductive organs in cortex, anatomical features, and absence of phaeophycean hairs on the surface. But they have rudimentary midrib on lower portion of thallus. We can observe the young plants on November, adult ones in June, and senile ones in August. This species has an annual life-cycle in the field, starting with germ lings in early November. The differentiation of thallus is quite different from other species of genera in tribe Zonarieae, e.g. Zonaria and Homoeostrichus. Three different tissues, meristoderm, cortex and medulla are discerned. The outmost cortical one celled layer as a meristoderm produce cortex by unequal periclinal division. In the apical cell division, the primary inner cells are developed into 3-4 cell layered medulla of thallus. The distribution of this species extends from Korea to Shizuoka Peninsula (34°40'N) Japan, which is the type locality of this species.

• 수산해양교육연구
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• 제27권6호
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• pp.1593-1601
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• 2015

Two marine algal halymeniacean species were collected from eastern coast of Korea during the survey of indigenous species of algae. One is distinct from other similar species by foliose thalli with irregular shape and several branches and linear proliferations without division. The other is characterized by indistinct midrib, foliose unbranched thalli and refractive ganglioid cells in medulla. These two species are identified as Grateloupia latissima and Cryptonemia yendoi based on the morphological features, respectively. Morphological and taxonomic notes on these species are included in the present study. This is the first record of G. latissima and C. yendoi from Korea.

• 한국연초학회지
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• 제5권2호
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• pp.25-32
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• 1983

To obtain basic information on the breeding of burley tobacco, classification of 41 varieties was carried out by using the cluster analysis of correlation coefficients and taxonomic distance based on twenty-one agromonic characters. Eight characters, such as days to flowering, length of flower axis, internode length, leaf length, yield, leaf angle to stem, vein angle to midrib and plant height, were useful in monothetic classification. Forty-one varieties were classified into four groups (I, II, III and IV) with weighted variable group method (WVGM ) and weighted jai. group method(WPGM), whereas the results classification of 33 varieties among them by WVGM were coincident with the results by WPGM. As for the characteristics of each group, group I related to late maturity, tall height and high yield, group II related to intermediate maturity, tall height and low yield, group 19 related to early maturity, intermediate height and low yield, and group W related to early maturity, short height and intermediate yield.

• 한국연초학회지
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• 제4권1호
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• pp.37-42
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• 1982

Korean local and introduced varieties were classified by the cluster analysis of correlation and taxonomic distance based on nineteen growth characters. 1. Thirty six varieties can be classified into three groups(I, II, III) by WVGM (weighted variable group method) 2. Major characters for classifying cultivars were days to flowering, number of leaves, leaf length, stem diameter and width of midrib: the five characters seemed to be useful in monothetic classification. 3. Korean varieties were similar to oriental, and japanese varieties to taiwan. 4. WVGM was more accurate and meaningful than classification by WPGM (weighted paired group method) and reticulate diagram of correlation. 5. Characteristics of each group: Group I closely related to many leaves, late of maturity and broad leaf type, Group II related to medium leaves, late of maturity and narrow leaf type, Croup 19 related to few leaves, early of maturity and medium leaf type respectively.

• 한국지구과학회지
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• 제35권5호
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• pp.299-304
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• 2014

In this study, fossil liverwort (Hepaticae) of Thallites yabei (Kryshtofovich) Harris is described based on the newly obtained material from the Lower Cretaceous Nakdong Formation of Sindong Group, Korea. The thalli of T. yabei is ribbon-like, bifurcating at least three or four times, and has a distinct midrib. Although the thalloid plants are herbaceous with little hard part, the thalli of T. yabei is relatively well preserved to show the sequentially bifurcating pattern in the specimens occurred in the same fossil locality. Such characteristics indicate that they were probably buried in situ. The abundant occurrence of thalli plants also indicate that land was covered densely by them as one of the terrestrial land plant members, and flourished under the tall arbor trees in the humid environment during the Early Cretaceous in the Gyeongsang Basin.

• 수산해양교육연구
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• 제28권6호
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• pp.1858-1864
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• 2016

Morphological and molecular information of two marine algae collected from Korea is given. One belonging to a green alga, is characterized by small size up to 4 cm high, much branched thalli on all sides, slender and linear branchlets which is constricted near base, axes without prominent branch scars, chloroplasts with a prominent central pyrenoid. The other, as a brown alga, is distinct from other Korean species in having cylindrical elevated projections at all parts of thallus axis, leaves with slightly serrulate margin together with distinct midrib bearing spines and absence to rarely occurred vesicles. In phylogenetic tree based on rbcL sequences, these two species are nested in the same clade with Bryopsis triploramosa and Sargassum polyporum, respectively. In this study, these two species are newly recorded in the Korean marine algal flora based on the morphological and molecular data.

• ALGAE
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• 제28권2호
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• pp.149-160
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• 2013

Six species of the genus Symphyocladia are currently recognized worldwide, all of which are reported to grow on the Korean coast. We described a new species Symphyocladia glabra sp. nov. based on morphological and molecular evidence. The new species is characterized by mostly an erect and broad thallus, the parallel arrangement of numerous apical cells, completely fused congenital cells, a corticated basal portion of faint midrib with six to eight pericentral cells, rhizoids cutting off from pericentral cells, and absent vegetative trichoblasts. The new species has morphological similarity to S. marchantioides and S. jejuinsula. However, S. glabra sp. nov. is distinguished from S. marchantioides by the corticated lower portion of the thallus and the absence of vegetative trichoblasts, and S. jejuinsula by number of pericentral cells and the fact that the thallus does not taper upward. The phylogeny of rbcL sequences indicated that S. glabra sp. nov. is definitely a separate entity within the genus Symphyocladia.

• 한국유기농업학회지
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• 제3권1호
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• pp.87-97
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• 1994

In the edible parts of chinese cabbage, the NO-3 accumulation was higher in the outer leaves than in the inner leaves and it was higher in the leaf midrib than in the leaf blade. In Radish, it was higher in the aerial part of the root than in the underground part of root. NO-3 accumulation in edible parts of chinese cabbage of organic farming fertilized with compost 8t/10a was about 4 times higher than those of conventional farming with recommended mineral nitrogen; and was similar to those of conventional farming fertilized with twice the mineral nitrogen rate. But, NO-3 accumulation in radish of organic farming with 8t/10a compost was lower than those of conventional farming with recommended mineral nitrogen. It showed NO-3 content in the edible parts of vegetables should be considered one of several parpmeters to judge a real safety vegetable to be certified by government.