• Korean Journal of Crystallography
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• v.13 no.1
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• pp.21-24
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• 2002

The crystal structure of cholesteryl crotonate was investigated by X-ray diffraction. Crystallo-graphic data for the title compound: P2₁, a = 13.446(4) , b = 11.802(3) , c = 18.782(5) , β = 103.99(2)°, Z = 4. Reflections were collected with an Enraf-Nonius CAD-4 diffractometer equipped with a graphite monochromator. The structure was solved by direct methods and refined by least-squares analyses. The final R value was 0.092 for 1604 reflections. The cholesterol fragment of the title compound were in good agreement with those for related cholesterol derivatives. The molecules were stacked in clearly separated layers. At the center of the layers, there were cholesterol-cholesteryl interactions between the symmetry-related A molecules and the cholesteryl-C(17) side chain of B molecules. There were also interactions between the C(17) side chain of A molecules and the crotonate chains off and B molecules in the interface region between layers. The crystal structure of the title compound turned out to be isostructural with those of cholesteryl ethylcarbonate, cholesteryl propylcarbonate, and cholesterol crotylcarbonate. The crystals show the liquid crystalline state having the cholesteric phase.

• Korean Journal of Ichthyology
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• v.35 no.2
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• pp.136-140
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• 2023

A single opah specimen (705 mm SL) was collected from Samcheok, South Korea on November, 2014, and firstly reported as Lampris guttatus by Jeong et al. (2015). Thereafter Lampris lauta was revived and three additional species (Lampris australensis, Lampris incognitus, Lampris megalopsis) were newly reported (Underkoffler et al., 2018). Therefore, it needs to review the scientific name of the Korean opah. The first reported opah specimen from Korea is now preserved as stuffed specimen at the Seodaemun Museum of Natural History in Seoul. We re-investigated the morphological features of stuffed specimen. It was characterized by having the following morphological combinations; orbital diameter is greater than 5% of fork length, whole body including head with white irregular spots, all fins are deep red. In addition, L. guttatus is confined to North Atlantic Ocean, whereas L. megalopsis is distributed worldwide from temperate to tropical waters. Therefore, our comprehensive study suggests that the scientific name of opah (L. guttatus) reported in Korea must be changed to L. megalopsis based on morphological characteristics and distribution area.

• Korean Journal of Ichthyology
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• v.11 no.1
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• pp.12-16
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• 1999

Four specimens of the odontobutid fish, Odontobutis obscura (Temminck et Schlegel) of the family Odontobutidae were collected for the first time from Koje Island, Kyongsangnam-do, Korea. Odontobutis obscura was easily discriminated from congeners in that this species have no sensory canals at preoperculomandibular and supraorbital pit lines on head and the first band on lateral side of body is extending from the middle of the first dorsal fin. This species distributes in western Japan mainly and Koje island which situates southernmostly in Korean Peninsula. So a new Korean name "Nambangdongsari" is proposed.

• Research in Plant Disease
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• v.16 no.3
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• pp.254-258
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• 2010

Melon necrotic spot virus (MNSV) is a very destructive disease to melon (Cucumis melo) plants. A MNSV was isolated from melon leaf showing necrotic spot symptoms at the plastic house in Naju, Korea in 2009. The isolate, designated as MNSV-Me, was identified and characterized by biological responses on several host plants, immuno captured RT-PCR and partial nucleotide sequencings of the genome. To evaluate MNSV-Me resistance in melon, thirty-five melon cultivars were mechanically inoculated on the cotyledon of the seedlings with the virus. MNSV-Me produced necrotic spots on the inoculated leaves of the all melon cultivars tested. Twenty-five cultivars were susceptible to the virus and they showed systemic necrotic spots on the leaves and/or necrosis longer than 3 cm in length on the stems within about forty days after inoculation. Five cultivars gave moderate resistance, no symptoms on the upper leaves but necrosis on the stem shorter than 3 cm in length. In an evaluation of MNSV-Me resistance in melon cultivars, 'Elstitan', 'Elsluxery', 'Betalichihage', 'Betalichi' and 'Womderfulhagae 1st' were found to have resistance by showing only faint necrosis on their stems.

• Research in Plant Disease
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• v.19 no.3
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• pp.183-187
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• 2013

Barley kernel discoloration (KD) leads to substantial loss in value through downgrading and discounting of malting barley. The objective of this research is to investigate fungal distribution and varieties resistance to KD in Korean two-rowed barley. Several fungal organisms including Alternaria spp., Fusarium spp., Aspergillus spp., Epicoccum spp. and Rhizopus spp. were isolated from Korean two-rowed barley representing KD. The symptoms of KD were brown and black discolorations of the lemma and palea. The most frequently detected fungal species was Alternaria spp. which exhibited 69.1% and 72.2% in 2011 and 2012, respectively. Epicoccum spp., Fusarium spp., and Aspergillus spp. were also detected. Fusarium spp., primary pathogen of barley head blight, were rarely occurred in the 2011 and their occurrence increased to 4.7% in 2012. Twenty cultivars of Korean two-rowed barely were evaluated to KD. The average percentage of KD was 8.0-36.0% in 2011 and 5.2-36.6% in 2012. Two cultivars ('Sacheon 6' and 'Dajinbori') showed KD of 6.2% to 8.8% and determined resistant, however 'Samdobori' and 'Daeyeongbori' demonstrating KD of 22.2-36.6% were highly susceptible. 'Jinyangbori', 'Danwonbori', 'Sinhobori' and 'Kwangmaegbori' showing KD of less than 15% were moderately resistant cultivar.

• Korean Journal of Ichthyology
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• v.24 no.4
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• pp.302-305
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• 2012

Two specimens (332.0~377.6 mm in standard length) of Benthodesmus tenuis (G$\ddot{u}$nther), belonging to the family Trichiuridae, firstly collected in off Heuksan-do and Yeosu, Jeollanam-do by the bottom trawl. This species was characterized by the following morphological traits: 125~126 dorsal fin rays (vs. 144~155 for B. pacificus), I, 73 anal fin rays (vs. 91~101), interorbital region flat (vs. interorbital region with prominent crest for A. anzac), opercular black and caudal fin forked. We propose a new Korean name, "Se-jang-gal-chi-sok" and "Se-jang-gal-chi" for the genus and species, respectively.

• Korean Journal of Ichthyology
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• v.17 no.2
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• pp.91-97
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• 2005

A taxonomic review of the genus Leiognathus was made based on specimens collected from the coast of Korea from 1997 to 2004. The genus Leiognathus in Korea includes 6 species: Leiognathus elongatus, L. fasciatus, L. lineolatus, L. nuchalis, L. rivulatus, and L. bindus. Leiognathus bindus is reported for the first time in Korea. It is characterized by having bright orange spots between the 2nd and 5th spines of the dorsal fin. Detailed morphological measurements and counts and a key to species of Leiognathus from Korea are provided.

• Korean Journal of Ichthyology
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• v.10 no.2
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• pp.164-167
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• 1998

Three specimens (148.8~227.1mm standard length) of the spotted butterfish, Scatophagus argus (Linnaeus), of the family Scatophagidae were collected for the first time from coastal waters of Puan, Chollabuk-do, Korea from October 1995 to September 1996. S. argus was characterized by having numerous round or oval black spots on body surface, 15~16 gill rakers, the united branchiostegal membranes and 4 anal fin spines.

• Korean Journal of Ichthyology
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• v.32 no.4
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• pp.251-256
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• 2020

We described the first record of Callogobius shunkan from Korea, based on two specimens (54.9~66.1 mm in standard length) collected from the southern coastal waters of Jejudo Island. These specimens were characterized by prominent papillae ridges on the head, including postnasal and postorbital rows, well-developed pelvic frenum, dark brownish head, scattered whitish flecks on the body, and three blackish spots on the basal portion of dorsal fins. We proposed a new Korean name, "Ju-reum-mang-dug" for the species.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.64 no.3
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• pp.176-184
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• 2019

The rice variety Chucheongbyeo is mostly cultivated for organic farming in the central region of Korea. This variety is more delicate than the recently developed varieties in rice yield, quality, and pest resistance, and is therefore, not suitable for organic farming. This study was conducted to select suitable varieties for organic rice farming in the central plain area of Korea. We tested 15 different varieties in the organic paddy field of Cheongju city from 2011 to 2013. As the experimental field had good fertility because it had been organically managed for many years, culm length and number of panicles developed better than the varietal characteristics. Daebo, Chinnong and Hyeonpum had slightly lower ripened grain ratio than Chucheongbyeo. The milled rice yield of Samkwang, Sukwang, Haiami, Cheonghaejinmi and Daebo increased by 9-18% compared to that of Chucheongbyeo. The protein content was under 7% for Cheongnam, Sukwang, Daebo, Samkwang, Hyeonpum, Chinnong, Chilbo, Hopyung, Hwangkeumnuri, Suryeojinmi and Jinsumi and under 6% for Sukwang and Samkwang. The whiteness was over 40 in Sukwang, Daebo, Samkwang and Jinsumi. The palatability grade and head rice ratio were good in Daebo, Sukwang, Samkwang and Jinsumi. Therefore, this study recommended Samkwang, Daebo, and Jinsumi as the optimal varieties for organic rice farming in the central plain area of Korea. These varieties could replace Chucheongbyeo, which is inferior to the recently developed varieties in terms of disease and pest resistance and yielding performance.