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Effect of In-row Plant Spacing on Growth and Yield of Korean Native Allium wakegi Araki
Jo,Man-Hyun,Ham,In-Ki,Park,Sang-Kyu,Seo,Gwan-Seok,Han,Gyu-Heung,Woo,In-Shik 한국자원식물학회 2003 Plant Resources Vol.6 No.2
Allium wakegi Araki was grown at plant spacings of 5, 10, 15, and 20 cm to determine the effect of planting density on the growth and yield. Allium wakegi Araki plants grown at the 5 cm plant spacing had the lowest bulb diameter and bulb weight, while plants at the lowest density (20 cm spacing) had the highest bulb diameter, bulb number, bulb weight and fresh weight. In general, plants grown at narrower spacings produced significantly smaller bulb diameter and bulb weight, but resulted in the highest yields and plants per hectare and lower fresh weights per plant.
Jo,Man-Hyun,Ham,In-ki,Park,Sang-kyu,Seo,Gwan-Seok,Han,Gyu-Heung,Woo,In-Shik 한국자원식물학회 2003 Plant Resources Vol.6 No.2
This study was conducted to develop the clonal propagation technique through in vitro culture using basal stem explants in Phalaenopsis hybrid grown in vitro. The highest frequency of protocorm-like body (PLB) formation was obtained when basal stem explants were cultured on VW medium containing 30g/L sucrose, 500 mg/L activated charcoal, 150 ml/L coconut water, 1 mg/L NAA, 5 mg/L 2iP and 2.5g/L gel rite. PLBs transferred to Hyponex medium were regenerated to plantlets. Plantlets transferred to plastic pots containing spagnum moss were developed and successfully acclimatized under greenhouse. The flower was bloomingly opened in plants regenerated from basal stem explants. The flower was not different from both mother plant and plant induced through clonal propagation of Phalaenopsis hybrid.
In Vivo Chemosenitivity Assay on the Subrenal Capsular Xenografts
Han, Ku Taek,Kim, Seung Jo,Namkoong, Sung Eun,Lee, Hun Young CATHOLIC MEDICAL CENTER 1988 Bulletin of the Clinical Research Institute Vol.16/17 No.1
The subrenal capsular assay is an in vivo method which permits chemosensitivity assessment in the human tumor fragments implanted into the sburenal capsular (SRC) space of mice. Previous studies have used transplantation-established human tumor xenograft systems implanted into athymic nude as well as normal immunocompetent mice. More recently, the subrenal capsular assay has been used to test of effectiveness of anticancer drugs against tumor xenograft implanted into normal immunocompetent mice using the 4 or 6 day time frame assay methods. On day 4, mice were sacrificed and the mean tumor diameter was measured. The tumor bearing kidney was fixed in 10% formalin solution and stained with hematoxylin-eosin. Histological analysis was performed by calculating their histologic scores which include the changes of amount and the extents of preservation of cancer cells, numbers of mitoses, and extents of tumor cell necroses or degenerations. We compared the changes of tumor size with histologic scores in the cervical cancer, ovarian cancer, and choriocarcinoma xenografts after the administration of the anticancer drugs and concluded as follows: 1. There were no statistically significant differences of the tumor size when compared that of the floated group with that of xenografts of the control group. 2. There were statistically significant differences of the histological scores when compared those of the treated group with those of xenografts of the control group. These results suggest that the analysis by calculating histological score of the xenografted tumor is more reliable than the simple measurement of tumor size change for the evaluation of the chemosensitivity of anticancer drugs in the 4-day in vivo chemosensitivity test.
Dead Time Compensation for Grid-connected PWM Inverter
Sang-Hyub Han,Tack-Hyun Jo,Jong-Hyoung Park,Heung-Geun Kim,Tae-Won Chun,Eui-Cheol Nho 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper proposes a new dead time compensation method for a PWM inverter. Recently, PWM inverters are widely used for industrial applications, such as ac motor drives, distributed grid-connected systems and a static synchronous compensator (STATCOM). The nonlinear characteristics of the switch and the dead time cause a current distortion and a deterioration of the power quality. The dominant harmonics is the 5<SUP>th</SUP> and 7<SUP>th</SUP> harmonics in the stationary reference frame, and the 6th harmonics in the synchronously rotating frame. In this paper, a resonant controller which compensates the 6<SUP>th</SUP> harmonics in the synchronously rotating frame is proposed. This method does not require any off-line experimental measurements, additional hardware and complicated mathematical calculations. Furthermore it is easy to implement and does not cause any stability problem.
Species identity of Phellinus linteus (sanghuang) extensively used as a medicinal mushroom in Korea
Han, J. G.,Hyun, M. W.,Kim, C. S.,Jo, J. W.,Cho, J. H.,Lee, K. H.,Kong, W. S.,Han, S. K.,Oh, J.,Sung, G. H. MICROBIOLOGICAL SOCIETY OF KOREA 2016 The journal of microbiology Vol.54 No.4
<P>Sanghuang is a medicinal mushroom that has gained particular attention in Korea. It has been extensively studied for the past few decades as a natural immune booster and cancer suppressor. Although the scientific name, Phellinus linteus, has been commonly used to refer to the sanghuang mushroom, the species identity of sanghuang has been called into question due to the ambiguity of its circumscription and the inadequacy of morphological distinctions within allied species. Because the species concept of sanghuang has been elucidated by recent molecular phylogenetic studies, it has become necessary to clarify the taxonomic positions of sanghuang strains extensively utilized in Korea. We conducted a phylogenetic analysis of 74 strains belonging to the P. linteus-baumii complex based on ITS nrDNA sequences. Parental stains of sanghuang varieties formally registered in the Korea Seed & Variety Service, including ASI 26046 (Corea sanghuang), 26114 (Boolro), and 26115 (HK 1-ho) were grouped with Sanghuangporus sanghuang instead of P. linteus in the inferred phylogeny.</P>
ON IDEMPOTENTS IN RELATION WITH REGULARITY
HAN, JUNCHEOL,LEE, YANG,PARK, SANGWON,SUNG, HYO JIN,YUN, SANG JO Korean Mathematical Society 2016 대한수학회지 Vol.53 No.1
We make a study of two generalizations of regular rings, concentrating our attention on the structure of idempotents. A ring R is said to be right attaching-idempotent if for $a{\in}R$ there exists $0{\neq}b{\in}R$ such that ab is an idempotent. Next R is said to be generalized regular if for $0{\neq}a{\in}R$ there exist nonzero $b{\in}R$ such that ab is a nonzero idempotent. It is first checked that generalized regular is left-right symmetric but right attaching-idempotent is not. The generalized regularity is shown to be a Morita invariant property. More structural properties of these two concepts are also investigated.
Taxonomical Studies of Three Unrecorded Entoloma Species in Korea
( Sung Eun Cho ),( Jong Won Jo ),( Young-nam Kwag ),( Jae-gu Han ),( Sang-kuk Han ),( Seung Hwan Oh ),( Chang Sun Kim ) 한국균학회 2019 韓國菌學會誌 Vol.47 No.4
Since 2013, more than 100 Entoloma (Entolomataceae, Agaricales) collections have been made during field investigations of mushroom flora in Korea. Among these collections, three Entoloma species were identified as new records from Korea. Morphological examinations were made based on the macro- and micro-morphological features of the isolates collected during field visits. To ensure the identity of the isolates at the species level, DNA sequences from four gene regions (rpb2 , ITS, 28S, and mtSSU) were compared. To the best of our knowledge, these are the first records of E. aprile, E. chytrophilum, and E. hirtipes in Korea. Comprehensive descriptions, photographs, and phylogenetic examinations are presented here.