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Search Results: 1 - 10 of 5310 matches for " Bon Soon Koo2 "
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The inhibitory effects of Nardostachys jatamansi on alcoholic chronic pancreatitis
Gi-Sang Bae1, Kyoung-Chel Park2, Bon Soon Koo2, Sun Bok Choi2, Il-Joo Jo2, Chang-Min Choi3, Ho-Joon Song2 & Sung-Joo Park1,2,*
BMB Reports , 2012,
Abstract: Nardostachys jatamansi (NJ) belonging to the Valerianaceae familyhas been used as a remedy for gastrointestinal inflammatory diseasesfor decades. However, the potential for NJ to ameliorate alcoholicchronic pancreatitis (ACP) is unknown. The aim of thisstudy was to examine the inhibitory effects of NJ on ACP.C57black/6 mice received ethanol injections intraperitoneally for 3weeks against a background of cerulein-induced acute pancreatitis.During ACP, NJ was ad libitum administrated orally with water.After 3 weeks of treatment, the pancreas was harvested for histologicalexamination. NJ treatment increased the pancreatic acinarcell survival (confirmed by amylase level testing) and reduced collagendeposition and pancreatic stellate cell (PSC) activation. In addition,NJ treatment reduced the activation but not death of PSC. Inconclusion, our results suggest that NJ attenuated ACP through theinhibition of PSC activation.
Ecological responses of natural and planted forests to thinning in southeastern Korea: a chronosequence study
Yong-Chan Cho,Jung Hun Pee,Gyeong Soon Kim,Bon-Yoel Koo
Journal of Ecology and Field Biology , 2011,
Abstract: Effects of forest thinning on community level properties have not been understood yet in Korea. We investigated regenerationpatterns and trajectories after a disturbance by applying a chronosequence approach. Light availability, litter andwoody debris cover, and species composition were determined for twenty 50 m line-transect samples representing a disturbanceduration gradient (within 11 years). Environmental factors such as light availability and coverage of woody debrisand litter changed abruptly after thinning and then returned to the pre-disturbance state. Although species richnesswas gained at shrub and ground layer in a limited way in both forests, cover of various functional types revealed diversityin their responses. Notably, Alnus firma stands exhibited a larger increment of cover in woody plants. Ordination analysisrevealed different regeneration trajectories between natural and planted stands. Based on ordination analysis, rehabilitatedstands showed movement to alternative states compared with natural ones, reflecting lower resilience to perturbation(i.e., lower stability). Our results suggest that community resilience to artificial thinning depends on properties ofthe dominant species. But to get more explanatory ecological information, longer-term static observations are required.
Dormancy Breaking and Effects on Tuber Yield of Potato Subjected to Various Chemicals and Growth Regulators under Greenhouse Conditions
Fazal Rehman,Seung Koo Lee2,Hyun Soon Kim,Jae Heung Jeon
Journal of Biological Sciences , 2001,
Abstract: This study was conducted to check the effect of various chemicals and growth regulators was checked on dormancy breaking of potato tubers, and also to check the subsequent effects on tuber yield under greenhouse conditions. The chemicals were tested on three potato cultivars having different dormancy release characters. Among the chemicals the tubers treated with rindite exhibited the highest sprouting ratio in all the cultivars. Cultivar Diamont took the least period of time for 50% of tubers to sprout followed by cultivar Atlantic. Highest decay ratio of tubers was observed for cultivar Atlantic and Diamont treated with thio-urea. The tubers treated with thio-urea induced the highest number of sprouts as compare to all other treatments. Significant differences were observed among the treatments and cultivars for various yield characters
Infrared [Fe II] and Dust Emissions from Supernova Remnants
Bon-Chul Koo
Physics , 2013, DOI: 10.1017/S1743921313009496
Abstract: Supernova remnants (SNRs) are strong thermal emitters of infrared radiation. The most prominent lines in the near-infrared spectra of SNRs are [Fe II] lines. The [Fe II] lines are from shocked dense atomic gases, so they trace SNRs in dense environments. After briefly reviewing the physics of the [Fe II] emission in SNR shocks, I describe the observational results which show that there are two groups of SNRs bright in [Fe II] emission: middle-aged SNRs interacting with molecular clouds and young core-collapse SNRs in dense circumstellar medium. The SNRs belonging to the former group are also bright in near-infrared H$_2$ emission, indicating that both atomic and molecular shocks are pervasive in these SNRs. The SNRs belonging to the latter group have relatively small radii in general, implying that most of them are likely the remnants of SN IIL/b or SN IIn that had strong mass loss before the explosion. I also comment on the "[Fe II]-H$_2$ reversal" in SNRs and on using the [Fe II]-line luminosity as an indicator of the supernova (SN) rate in galaxies. In the mid- and far-infrared regimes, thermal dust emission is dominant. The dust in SNRs can be heated either by collisions with gas species in a hot plasma or by radiation from a shock front. I discuss the characteristics of the infrared morphology of the SNRs interacting with molecular clouds and their dust heating processes. Finally, I give a brief summary of the detection of SN dust and crystalline silicate dust in SNRs.
Uch II regions with extended envelopes
Kee Tae Kim,Bon Chul Koo
Revista mexicana de astronomía y astrofísica , 2002,
Abstract: Presentamos observaciones de radio, en l neas de recombinaci on y el cont nuo, de 16 UCH II con cocientes de ujo, en una antena a VLA, grandes. Excepto por una, todas las fuentes est an f sicamente asociadas a la emisi on extendida y posiblemente son excitadas por la misma fuente. Entonces, casi ninguna de las fuentes observadas son regiones UCH II reales, sino n ucleos de regiones H II extendidas. Consideramos el origen de la emisi on extendida y discutimos sus implicaciones en el problema de las edades de regiones UCH II.
Clinical applications of fractional flow reserve in bifurcation lesions
Sang Hyun Park,Bon-Kwon Koo
老年心脏病学杂志(英文版) , 2012,
Abstract: Percutaneous coronary intervention (PCI) for coronary bifurcation lesions has been associated with lower procedural success rates and worse clinical outcomes compared with PCI for simple coronary lesions. Angiographic evaluation alone is sometimes inaccurate and does not reflect the functional significance of bifurcation lesions. The fractional flow reserve (FFR) is an easily obtainable, reliable, and reproducible physiologic parameter. This parameter is epicardial lesion specific and reflects both degree of stenosis and the myocardial territory supplied by the specific artery. Recent studies have shown that FFR-guided provisional side branch intervention strategy for bifurcation lesions is feasible and effective and can reduce unnecessary complex interventions and related complications. However, an adequate understanding of coronary physiology and the pitfalls of FFR is essential to properly use FFR for PCI of complex bifurcation lesions.
Myrrh Inhibits LPS-Induced Inflammatory Response and Protects from Cecal Ligation and Puncture-Induced Sepsis
Min-Sun Kim,Gi-Sang Bae,Kyoung-Chel Park,Bon Soon Koo,Byung-Jin Kim,Hye-Jin Lee,Sang-Wan Seo,Yong Kook Shin,Won-Seok Jung,Jung-Hee Cho,Youn-Chul Kim,Tae-Hyeon Kim,Ho-Joon Song,Sung-Joo Park
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/278718
Abstract: Myrrh has been used as an antibacterial and anti-inflammatory agent. However, effect of myrrh on peritoneal macrophages and clinically relevant models of septic shock, such as cecal ligation and puncture (CLP), is not well understood. Here, we investigated the inhibitory effect and mechanism(s) of myrrh on inflammatory responses. Myrrh inhibited LPS-induced productions of inflammatory mediators such as nitric oxide, prostaglandin E2, and tumor necrosis factor-α but not of interleukin (IL)-1β and IL-6 in peritoneal macrophages. In addition, Myrrh inhibited LPS-induced activation of c-jun NH2-terminal kinase (JNK) but not of extracellular signal-regulated kinase (ERK), p38, and nuclear factor-κB. Administration of Myrrh reduced the CLP-induced mortality and bacterial counts and inhibited inflammatory mediators. Furthermore, administration of Myrrh attenuated CLP-induced liver damages, which were mainly evidenced by decreased infiltration of leukocytes and aspartate aminotransferase/alanine aminotransferase level. Taken together, these results provide the evidence for the anti-inflammatory and antibacterial potential of Myrrh in sepsis.
Clinical applications of fractional flow reserve in bifurcation lesions

Sang Hyun Park,Bon-Kwon Koo,

老年心脏病学杂志(英文版) , 2012,
Abstract: Percutaneous coronary intervention (PCI) for coronary bifurcation lesions has been associated with lower procedural success rates and worse clinical outcomes compared with PCI for simple coronary lesions. Angiographic evaluation alone is sometimes inaccurate and does not reflect the functional significance of bifurcation lesions. The fractional flow reserve (FFR) is an easily obtainable, reliable, and reproducible physiologic parameter. This parameter is epicardial lesion specific and reflects both degree of stenosis and the myocardial territory supplied by the specific artery. Recent studies have shown that FFR-guided provisional side branch intervention strategy for bifurcation lesions is feasible and effective and can reduce unnecessary complex interventions and related complications. However, an adequate understanding of coronary physiology and the pitfalls of FFR is essential to properly use FFR for PCI of complex bifurcation lesions.
Detection of 3.3 Micron Aromatic Feature in the Supernova Remnant N49 with AKARI
Ji Yeon Seok,Bon-Chul Koo,Takashi Onaka
Physics , 2011, DOI: 10.1088/0004-637X/744/2/160
Abstract: We present an infrared study of the supernova remnant (SNR) N49 in the Large Magellanic Cloud with the near-infrared (NIR; 2.5 - 5 {\mu}m) spectroscopic observations performed by AKARI. The observations were performed as a coarse spectral mapping to cover most of the bright region in the east, which enables us to compare the distribution of various line emission and to examine their correlation. We detect the 3.3 {\mu}m aromatic feature in the remnant, which is for the first time to report the presence of the 3.3 {\mu}m aromatic feature related to a SNR. In the line maps of H2 1-0 O(3), 3.3 {\mu}m feature, and Br{\alpha}, the distribution of the aromatic feature shows overall correlation with those of other emissions together with regional differences reflecting the local physical conditions. By comparison with other archival imaging data at different wavelengths, the association of the aromatic emission to other ionic/molecular emission is clarified. We examine archival Spitzer IRS data of N49 and find signatures of other polycyclic aromatic hydrocarbon (PAH) features at 6.2, 7.7, and 11.3 {\mu}m corresponding to the 3.3 {\mu}m aromatic feature. Based on the band ratios of PAHs, we find that PAHs in N49 are not only dominantly neutral but also small in size. We discuss the origin of the PAH emission in N49 and conclude that the emission is either from PAHs that have survived the shock or PAHs in the preshock gas heated by radiative precursor.
An Infrared and Radio Study of the Galactic Worm GW46.4+5.5
Kee-Tae Kim,Bon-Chul Koo
Physics , 1999, DOI: 10.1086/308262
Abstract: We have carried out high-resolution (~3') HI and CO line observations of GW46.4+5.5 and analyzed available IR and radio emission survey data. GW46.4+5.5 appears as a long filamentary structure extending vertically from the Galactic plane in both far-IR and radio continuum maps. The I_60/I_100 ratio in the worm is estimated to be 0.29+-0.05, which is significantly higher than the value for the solar neighborhood. The high ratio is consistent with a hypothesis that the dusts in the worms have been processed by interstellar shocks. The radio continuum emission from the worm has a spectral index of -0.47 and does not correlate with I_60. Thus, most of the radio continuum emission is likely to be nonthermal. Our HI observations show that the HI gas is clumpy. We detected two molecular clouds associated with the HI peaks. The molecular clouds do not appear to be gravitationally bound. Using the Leiden-Dwingeloo HI data, we identify an expanding HI supershell associated with GW46.4+5.5, which is a size of 14^o*22^o. The supershell appears between 18 and 40 km/s, and decreases slowly in size as the velocity increases. An averaged l-v diagram reveals that the supershell has a central velocity of ~18 km/s (d_kin=1.4 kpc) and an expansion velocity of ~15 km/s. The structure is also visible in adio continuum maps. The observed molecular clouds might have condensed out of shock-compressed gas in GW46.4+5.5 because they are closely associated with the HI gas in velocity as well as in position. Their altitudes are 80 and 100 pc, respectively, and their physical properties are very similar to those of the high-altitude clouds. Our results suggest that at least some of the high-altitude clouds might have formed in Galactic worms (or HI supershells).
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