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[PC-0012] Pre-study for early detection of Fusarium fujikuroi via fluorescence imaging method
Jaeyoung Kim(Jaeyoung Kim),Younguk Kim(Younguk Kim),Hyeonso Ji(Hyeonso Ji),Songlim Kim(Songlim Kim),Hyoja Oh(Hyoja Oh),Youngjun Mo(Youngjun Mo),Kyunghwan Kim(Kyunghwan Kim),Jeongho Baek(Jeongho Baek) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Kim JeongHo,Lee Sang-Hoon,Kim Jiye,Hong Seung-Phil,Kim Sug Won 대한성형외과학회 2023 Archives of Plastic Surgery Vol.50 No.1
A 57-year-old man presented with a pigmented papule, 0.4 cm in diameter, on the left lower eyelid. Skin biopsy revealed a basal cell carcinoma, which was excised through a wide excision followed by a full-thickness skin graft (FTSG). Two weeks after the surgery, an erythematous nodule developed in the lower margin of the graft recipient site. The nodule size increased rapidly over 2 weeks, becoming dome-shaped with a central hyperkeratotic plug. A diagnosis of keratoacanthoma (KA) was made, and surgical excision was performed. Histological findings revealed a large, well-differentiated squamous tumor with a central keratin-filled crater and buttress. The HPV genotyping results were negative. Risk factors for KA include trauma, old age, exposure to UV radiation, immunosuppression, and HPV infection. KA has most often been reported to develop at the donor site. Although the pathogenesis of KA is unclear, trauma is believed to act as a second insult to a preceding oncogenic insult, such as exposure to UV radiation, resulting in a koebnerization. Herein, we report a case of solitary KA at a FTSG recipient site. This report presents information that may provide guidance during dermatologic surgeries.
Kim, Kyung Hwan,Ki, Hosung,Oang, Key Young,Nozawa, Shunsuke,Sato, Tokushi,Kim, Joonghan,Kim, Tae Kyu,Kim, Jeongho,Adachi, Shin‐,ichi,Ihee, Hyotcherl WILEY‐VCH Verlag 2013 Chemphyschem Vol.14 No.16
<P><B>Abstract</B></P><P>The mechanism of a photochemical reaction involves the formation and dissociation of various short‐lived species on ultrafast timescales and therefore its characterization requires detailed structural information on the transient species. By making use of a structurally sensitive X‐ray probe, time‐resolved X‐ray liquidography (TRXL) can directly elucidate the structures of reacting molecules in the solution phase and thus determine the comprehensive reaction mechanism with high accuracy. In this work, by performing TRXL measurements at two different wavelengths (400 and 267 nm), the reaction mechanism of I<SUB>3</SUB><SUP>−</SUP> photolysis, which changes subtly depending on the excitation wavelength, is elucidated. Upon 400 nm photoexcitation, the I<SUB>3</SUB><SUP>−</SUP> ion dissociates into I<SUB>2</SUB><SUP>−</SUP> and I. By contrast, upon 267 nm photoexcitation, the I<SUB>3</SUB><SUP>−</SUP> ion undergoes both two‐body dissociation (I<SUB>2</SUB><SUP>−</SUP>+I) and three‐body dissociation (I<SUP>−</SUP>+2I) with 7:3 molar ratio. At both excitation wavelengths, all the transient species ultimately disappear in 80 ns by recombining to form the I<SUB>3</SUB><SUP>−</SUP> ion nongeminately. In addition to the reaction dynamics of solute species, the results reveal the transient structure of the solute/solvent cage and the changes in solvent density and temperature as a function of time.</P>
Kim JeongHo,Yang Chae Eun,Kim Sug Won,Kim Jiye 대한성형외과학회 2023 Archives of Plastic Surgery Vol.50 No.1
Background: The coronavirus disease 2019 (COVID-19) outbreak has had a major impact worldwide. Several countries have implemented restrictions on social interaction (“social distancing”). Several studies have reported that the epidemiology of trauma patients, such as those with facial bone fractures, has changed after COVID-19 pandemic. This study aimed to further explore these specific changes. Methods: This was a retrospective study of patients who presented to a single institution with facial bone fractures between January 1, 2016, and December 31, 2020. Baseline patient demographics, clinical information, type of fracture, etiology, and operative management were compared before and after COVID-19. Results: Of all cases, 3,409 occurred before COVID-19, and 602 occurred after COVID-19. Since the outbreak of COVID-19, the number of patients with facial fractures has not decreased significantly. A significant increase was noted in fractures that occurred outdoors (p<0.001). However, a decrease was observed in operative management between the groups (p<0.001). There was no significant difference in the proportion of assault, fall-down, industrial accident, or roll-down. In contrast, the proportion of traffic accidents and slip-down categories increased significantly (p<0.05). Moreover, a significant decrease was found in the proportion of the sports category (p=0.001) Conclusions: It was confirmed through this study that COVID-19 pandemic also affected epidemiology of facial fractures. Focusing on these changes, it is necessary to develop safety measures to reduce facial fractures.
Structural Dynamics of 1,2-Diiodoethane in Cyclohexane Probed by Picosecond X-ray Liquidography
Kim, Jeongho,Lee, Jae Hyuk,Kim, Joonghan,Jun, Sunhong,Kim, Kyung Hwan,Kim, Tae Wu,Wulff, Michael,Ihee, Hyotcherl American Chemical Society 2012 The journal of physical chemistry. A, Molecules, s Vol.116 No.11
<P>We investigate the structural dynamics of iodine elimination reaction of 1,2-diiodoethane (C<SUB>2</SUB>H<SUB>4</SUB>I<SUB>2</SUB>) in cyclohexane by applying time-resolved X-ray liquidography (TRXL). The TRXL technique combines structural sensitivity of X-ray diffraction and 100 ps time resolution of X-ray pulses from synchrotron and allows direct probing of transient structure of reacting molecules. From the analysis of time-dependent X-ray solution scattering patterns using global fitting based on DFT calculation and MD simulation, we elucidate the kinetics and structure of transient intermediates resulting from photodissociation of C<SUB>2</SUB>H<SUB>4</SUB>I<SUB>2</SUB>. In particular, the effect of solvent on the reaction kinetics and pathways is examined by comparison with an earlier TRXL study on the same reaction in methanol. In cyclohexane, the C<SUB>2</SUB>H<SUB>4</SUB>I radical intermediate undergoes two branched reaction pathways, formation of C<SUB>2</SUB>H<SUB>4</SUB>I–I isomer and direct dissociation into C<SUB>2</SUB>H<SUB>4</SUB> and I, while only isomer formation occurs in methanol. Also, the C<SUB>2</SUB>H<SUB>4</SUB>I–I isomer has a shorter lifetime in cyclohexane by an order of magnitude than in methanol. The difference in the reaction dynamics in the two solvents is accounted for by the difference in solvent polarity. In addition, we determine that the C<SUB>2</SUB>H<SUB>4</SUB>I radical has a bridged structure, not a classical structure, in cyclohexane.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcafh/2012/jpcafh.2012.116.issue-11/jp2078314/production/images/medium/jp-2011-078314_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp2078314'>ACS Electronic Supporting Info</A></P>
Kim, Kyung Hwan,Kim, Jeongho,Oang, Key Young,Lee, Jae Hyuk,Grolimund, Daniel,Milne, Christopher J.,Penfold, Thomas J.,Johnson, Steven L.,Galler, Andreas,Kim, Tae Wu,Kim, Jong Goo,Suh, Deokbeom,Moon, J The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.36
<P>Identifying the intermediate species along a reaction pathway is a first step towards a complete understanding of the reaction mechanism, but often this task is not trivial. There has been a strong on-going debate: which of the three intermediates, the CHI<SUB>2</SUB> radical, the CHI<SUB>2</SUB>–I isomer, and the CHI<SUB>2</SUB><SUP>+</SUP> ion, is the dominant intermediate species formed in the photolysis of iodoform (CHI<SUB>3</SUB>)? Herein, by combining time-resolved X-ray liquidography (TRXL) and time-resolved X-ray absorption spectroscopy (TR-XAS), we present strong evidence that the CHI<SUB>2</SUB> radical is dominantly formed from the photolysis of CHI<SUB>3</SUB> in methanol at 267 nm within the available time resolution of the techniques (∼20 ps for TRXL and ∼100 ps for TR-XAS). The TRXL measurement, conducted using the time-slicing scheme, detected no CHI<SUB>2</SUB>–I isomer within our signal-to-noise ratio, indicating that, if formed, the CHI<SUB>2</SUB>–I isomer must be a minor intermediate. The TR-XAS transient spectra measured at the iodine L<SUB>1</SUB> and L<SUB>3</SUB> edges support the same conclusion. The present work demonstrates that the application of these two complementary time-resolved X-ray methods to the same system can provide a detailed understanding of the reaction mechanism.</P> <P>Graphic Abstract</P><P>We identify a major transient species formed in the photolysis of CHI<SUB>3</SUB> by combining time-resolved X-ray liquidography (TRXL) and time-resolved X-ray absorption spectroscopy (TR-XAS). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cp03686k'> </P>