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Kang, Ah-Rang,Baek, Jee-Yeon,Lee, Sang-Hyun,Cho, Young-Sik,Kim, Wol-Soo,Han, Yeon-Soo,Kim, Ik-Soo The Korean Society for Integrative Biology 2012 Animal cells and systems Vol.16 No.2
The pear psylla, $Cacopsylla$ $pyricola$ (Hemiptera: Psyllidae), is a serious insect pest of commercial pear crops. The species, which resides on pear trees throughout its life cycle, is rapidly spreading in some regions of the world. The population genetic structure of the species collected from several pear orchards in Korea was studied to understand the nature of dispersal and field ecology of the species. The 658-bp region of mitochondrial COI gene and the 716-bp long complete internal transcribed spacer 2 (ITS2) of the nuclear ribosomal DNA were sequenced. Unlike other previously studied insect pests, the COI-based genetic diversity of the pear psylla was extremely low (maximum sequence divergence of 0.15%). This finding allowed us to conclude that the species may have been introduced in Korea relatively recently. ITS2 sequence-based analyses of phylogeny, population differentiation, gene flow, and hierarchical population structure all concordantly suggested that the pear psylla populations in Korea are neither genetically isolated nor hampered for gene flow. These genetic data are concordant with the dispersal of an overwintering winterform morph outside the non-pear habitat in the fall.
Kang, Wol-Rang,Woo, Jong-Hak,Schulze, Andreas,Riechers, Dominik A.,Kim, Sang Chul,Park, Daeseong,Smolcic, Vernesa IOP Publishing 2013 The Astrophysical journal Vol.767 No.1
<P>To calibrate stellar velocity dispersion measurements from optical and near-IR stellar lines, and to improve the black hole mass (M-BH)-stellar velocity dispersion (sigma(*)) relation, we measure sigma(*) based on high-quality H-band spectra for a sample of 31 nearby galaxies, for which dynamical M-BH is available in the literature. By comparing velocity dispersions measured from stellar lines in the H-band with those measured from optical stellar lines, we find no significant difference, suggesting that optical and near-IR stellar lines represent the same kinematics and that dust effect is negligible for early-type galaxies. Based on the spatially resolved rotation and velocity dispersion measurements along the major axis of each galaxy, we find that a rotating stellar disk is present for 80% of galaxies in the sample. For galaxies with a rotation component, sigma(*) measured from a single aperture spectrum can vary by up to similar to 20%, depending on the size of the adopted extraction aperture. To correct for the rotational broadening, we derive luminosity-weighted sigma(*) within the effective radius of each galaxy, providing uniformly measured velocity dispersions to improve the M-BH-sigma(*) relation.</P>
Ah Rang Kang,Jee Yeon Baek,Sang Hyun Lee,Young Sik Cho,Wol Soo Kim,Yeon Soo Han,Iksoo Kim 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
The pear psylla, Cacopsylla pyricola Foerster (Homoptera: Psyllidae), is a serious insect pest of commercial pear crops. The species, which resides on pear trees throughout its life cycle, is rapidly spreading in some regions of the world. Given the life cycle, it is unclear how such a rapid spread has been facilitated. Presently, the population genetic structure of the species including genetic diversity and gene flow was studied to understand the nature of dispersal and field ecology of the species. Pear psylla was collected from several pear orchards in Korea. The 658-bp region of mitochondrial COI gene and the 716-bp long complete internal transcribed spacer 2 (ITS2) of the nuclear ribosomal DNA were sequenced. Unlikely other previously studied insect pests, the COI-based genetic diversity of the pear psylla was extremely low (maximum sequence divergence of 0.15%). This finding allowed us to conclude that the species may have been introduced in Korea relatively recently, possibly with the phenomenon of genetic bottlenecks. ITS2 sequence-based analyses of phylogeny, population differentiation, gene flow, and hierarchical population structure all concordantly suggested that the pear psylla populations in Korea are neither genetically isolated nor hampered for gene flow. These genetic data are concordant with the dispersal of an overwintering winterform morph outside the non-pear habitat in the fall and the possibility of subsequently longer distant dispersal.
( Joong Won Park ),( Jeong Sun Par ),( Ah Rang Kang ),( In Seop Na ),( Gwang Hong Cha ),( Hwan Jung Oh ),( Sang Hyun Lee ),( Kwang Yeol Yang ),( Wol Soo Kim ),( Iksoo Kim ) 한국잠사학회 2012 International Journal of Industrial Entomology Vol.25 No.2
A decrease in pass ratio of Korean exporting pears causes several negative effects including an increase in pesticide dependency. In this study, we attempted to establish the pest forecasting management system, composed of weekly field forecasting by pear farmers, meteorological data obtained by automatic weather station (AWS), newly designed internet web page (http://pearpest.jnu.ac.kr/) as information collecting and providing ground, and information providing service. The weekly field forecasting information on major pear diseases and pests was collected from the forecasting team composed of five team leaders from each pear exporting complex. Further, an abridged weather information for the prediction of an infestation of major disease (pear scab) and pest (pear psylla and scale species) was obtained from an AWS installed at Bonghwang in Naju City. Such information was then promptly uploaded on the web page and also publicized to the pear famers specializing in export. We hope this pest forecasting management system increases the pass ratio of Korean exporting pears throughout establishment of famer-oriented forecasting, inspiring famers` effort for the prevention and forecasting of diseases and pests occurring at pear orchards.
DO QUIESCENT AND ACTIVE GALAXIES HAVE DIFFERENT<i>M</i><sub>BH</sub>-σ<sub>*</sub>RELATIONS?
Woo, Jong-Hak,Schulze, Andreas,Park, Daeseong,Kang, Wol-Rang,Kim, Sang Chul,Riechers, Dominik A. IOP Publishing 2013 The Astrophysical journal Vol.772 No.1
<P>To investigate the validity of the assumption that quiescent galaxies and active galaxies follow the same black hole mass (M-BH)-stellar velocity dispersion (sigma(*)) relation, as required for the calibration of M-BH estimators for broad line active galactic nuclei (AGNs), we determine and compare the M-BH-sigma(*) relations, respectively, for quiescent and active galaxies. For the quiescent galaxy sample, composed of 72 dynamical M-BH measurements, we update sigma(*) for 28 galaxies using homogeneous H-band measurements that are corrected for galaxy rotation. For active galaxies, we collect 25 reverberation-mapped AGNs and improve sigma(*) measurement for two objects. Combining the two samples, we determine the virial factor f, first by scaling the active galaxy sample to the M-BH-sigma(*) relation of quiescent galaxies, and second by simultaneously fitting the quiescent and active galaxy samples, as f = 5.1(-1.1)(+1.5) and f = 5.9(-1.5)(+2.1), respectively. The M-BH-sigma(*) relation of active galaxies appears to be shallower than that of quiescent galaxies. However, the discrepancy is caused by a difference in the accessible M-BH distribution at given sigma(*), primarily due to the difficulty of measuring reliable stellar velocity dispersion for the host galaxies of luminous AGNs. Accounting for the selection effects, we find that active and quiescent galaxies are consistent with following intrinsically the same M-BH-sigma(*) relation.</P>
Park, Joong Won,Park, Jeong Sun,Kang, Ah Rang,Na, In Seop,Cha, Gwang Hong,Oh, Hwan Jung,Lee, Sang Hyun,Yang, Kwang Yeol,Kim, Wol Soo,Kim, Iksoo Korean Society of Sericultural Science 2012 International Journal of Industrial Entomology Vol.25 No.2
A decrease in pass ratio of Korean exporting pears causes several negative effects including an increase in pesticide dependency. In this study, we attempted to establish the pest forecasting management system, composed of weekly field forecasting by pear farmers, meteorological data obtained by automatic weather station (AWS), newly designed internet web page ($\underline{http://pearpest.jnu.ac.kr/}$) as information collecting and providing ground, and information providing service. The weekly field forecasting information on major pear diseases and pests was collected from the forecasting team composed of five team leaders from each pear exporting complex. Further, an abridged weather information for the prediction of an infestation of major disease (pear scab) and pest (pear psylla and scale species) was obtained from an AWS installed at Bonghwang in Naju City. Such information was then promptly uploaded on the web page and also publicized to the pear famers specializing in export. We hope this pest forecasting management system increases the pass ratio of Korean exporting pears throughout establishment of famer-oriented forecasting, inspiring famers' effort for the prevention and forecasting of diseases and pests occurring at pear orchards.