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Comparison of soil bacterial diversity and community composition between clear-cut logging and control sites in a temperate deciduous broad-leaved forest in Mt. Sambong, South Korea

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Journal of Forestry Research 2020年第6期31卷 2367-2375页

作者： Byeong-Ju Lee soo Hyung eo Department of Forest Resources Kongju National UniversityYesanChungnam 32439Republic of Korea

Deforestation or clear-cut logging affects forest ecosystems,including soil microbial communities.The purpose of this study was to investigate the effects of clearcut logging on the soil bacterial community in a temperate deciduous broad-leaved forest on Mt.Sambong,South Korea.We investigated the physicochemical characteristics and bacterial diversity of the soil in clear-cut logging and control sites.The available phosphorus(AP)level in soil was significantly lower in the clear-cut sites than in the control;however,the other physicochemical properties of soil were similar at the two sites.By examining the bacterial 16S rRNA gene using next-generation sequencing,we found that the number of bacterial taxa at the species and phylum level were similar at the control and clear-cut sites.Consistent with the high resilience of bacterial communities and absence of change in the soil physicochemical properties—with the exception of AP—we found similar levels of bacterial diversity at the two sites.Although most taxa showed similar composition ratios at the control and the clear-cut sites,some taxa such as Deltaproteobacteria,Ktedonobacteriales,Myxocccales,Polyangiaceae,Pedosphaera_f,and Solibacter showed differences after clear-cut logging.We conclude that AP was significantly associated with those bacterial taxa that showed differences in their composition ratios following clear-cut logging.

关键词： Forest soil Metagenomics Pyrosequencing Soil physicochemical characteristics

Reconstruction of the lower back wound with delayed infection after spinal surgery:A case report

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世界临床病例杂志 2023年第27期11卷 6646-6652页

作者： DoWon Kim sooA Lim SuRak eo Jung soo Yoon Department of Plastic and Reconstructive Surgery DongGuk University Ilsan HospitalGoyang 10326South Korea

BACKGROUND Orthopedic surgeries after device implantation are susceptible to infections and may require device removal in the worst cases.For this reason,many efforts are being made to control infections after spinal surgery;however,the number of infec-tion cases is increasing owing to the increasing number of elderly citizens.CASE SUMMARY A 75-year-old male with a chronic spinal defect due to previous spine surgery underwent reconstruction using a perforator-based island flap.After bursectomy and confirmation that there was no connection with the deep tissue,reconstruction was performed.However,wound disruption occurred with abscess formation on postoperative day 29,which led to an imaging workup revealing delayed deep tissue infection.CONCLUSION Infection is one of the most common causes of surgical wound dehiscence and is associated with devastating results if not controlled promptly and definitively.Surgeons should always suspect delayed infections when reconstructing chronic soft tissue defects.

关键词： Surgical wound dehiscence Surgical wound infection Lumbar spine Complications Abscess Case report

Recurred forehead osteoma disseminated after previous osteoma excision:A case report

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World Journal of Clinical Cases 2023年第31期11卷 7684-7689页

作者： Dong Yun Lee sooA Lim Jung soo Yoon SuRak eo Plastic and Reconstructive Surgery DongGuk University Medical CenterGoYang 10326South Korea

BACKGROUND Forehead osteoma is a commonly encountered benign facial bone tumor.Endoscopic excision of benign forehead masses is widely performed.Here,we report a rare case of recurrent forehead osteoma that disseminated after a previous osteoma excision.CASE SUMMARY A 54-year-old female patient had previously undergone endoscopic removal of a single forehead osteoma at 30 years of age.However,she had a recurrent osteoma around the same site and underwent another endoscopic resection at 40 years of age.During her first visit to our outpatient clinic,she presented with a cobblestone-like irregular surface on the forehead and a 3D facial bone computed tomography scan revealed a widely ragged surface of the inoculated osteoma on the outer table of the frontal bone.Under general anesthesia,we performed a radical complete excision of the disseminated osteoma through a bicoronal incision using an osteotome,chisel,mallet,and rasping.We hypothesized that the recurrence may have been caused by the inoculation of residual osteoma remnants from the previous procedure.Craniofacial surgeons should be cautious when removing osteoma particles,particularly when using an endoscopic approach.CONCLUSION To prevent recurrence,it is essential to conduct additional meticulous burring and a thorough inspection of the surface after copious irrigation.

关键词： Recurred osteoma Inoculation Dissemination Bicoronal approach Craniofacial Case report

Successful reconstruction of an ankle defect with free tissue transfer in a hemophilia A patient with repetitive hemoarthrosis:A case report

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World Journal of Clinical Cases 2023年第17期11卷 4079-4083页

作者： Dong Yun Lee sooA Lim SuRak eo Jung soo Yoon Department of Plastic and Reconstructive Surgery DongGuk University Medical CenterGoYang 10326South Korea

BACKGROUND Hemophilia, an uncommon yet consequential hereditary bleeding disorder, manifests as two clinically indistinguishable forms that hinder the normal functioning of the coagulation cascade. This impairment renders individuals more susceptible to excessive bleeding during significant surgical interventions. Moreover, individuals with severe hemophilia frequently encounter recurring hemarthrosis, resulting in progressive joint destruction and, subsequently, the need for hip and knee replacement surgeries.CASE SUMMARY The patient was a 53-year-old man with hemophilia A as the underlying disease and had self-injected factor Ⅷ twice weekly for several decades. He had undergone ankle fusion surgery for recurrent hemarthrosis at the Department of Orthopedic Surgery 1 mo prior and was referred to our department because of skin necrosis after a hematoma at the surgical site. An anterolateral thigh perforator free flap was created after three cycles of factor Ⅷ administration in addition to the concomitant administration of tranexamic acid(TXA)(Transamin 250 mg cap, 1 cap tid, q8h). After the operation, from postoperative days(PODs) 1-5, the factor Ⅷ dose and interval were maintained, and q12h administration was tapered to q24h administration after POD 6. Because the patient’s flap was stable 12 d after the operation, factor Ⅷ administration was tapered to twice a week. At 6 mo follow-up, the patient recovered well without any complications.CONCLUSION To the best of our knowledge, there are very few reports of successful free flaps in patients with hemophilia, and none have been reported in patients with hemophilia A. Moreover, there are several reports on the efficacy of TXA in free flaps in general patients;however, there are no case reports of combining factor Ⅷ and TXA in patients with hemophilia. Therefore, we report this case to contribute to future academic research.

关键词： Free tissue transfer Anterolateral thigh free flap Hemophilia A Hemoarthrosis Factor VIII Tranexamic acid Case report

Gouty tenosynovitis with compartment syndrome in the hand: A case report

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World Journal of Clinical Cases 2023年第30期11卷 7492-7496页

作者： Dong Yun Lee SuRak eo sooA Lim Jung soo Yoon Department of Plastic and Reconstructive Surgery DongGuk University Medical CenterGoYang 10326South Korea

BACKGROUND Gout is a common type of inflammatory arthritis caused by the deposition of monosodium urate crystals in the joints and surrounding tissues.It typically appears with abrupt and intense pain,redness,and swelling in the affected joint.It frequently targets the lower extremities,such as the big toe.However,rarely,gout can manifest in atypical locations,including the hands,leading to an uncommon presentation known as gouty tenosynovitis.However,it can result in significant morbidity owing to the potential for severe complications,such as myonecrosis and compartment syndrome.CASE SUMMARY An 82-year-old male patient with a history of hypertension,cerebral infarction,Parkinson's disease,and recurrent gout attacks sought medical attention because of progressive pain and swelling in the right hand.Imaging findings revealed forearm swelling,raising concerns of possible tenosynovitis,bursitis,septic arthritis,and compartment syndrome.A fasciotomy was performed to decompress the patient’s hands and forearms.The procedure revealed diffuse tenosynovitis,tophi with a pus-like discharge surrounding the carpal tunnel,and involvement of the flexor and extensor tendon sheaths.However,microbiological investigations,including Gram staining,acid-fast bacilli,tuberculosis,and nontuberculous mycobacteria,yielded negative results.The patient was ultimately diagnosed with a severe gouty attack with compartment syndrome and myonecrosis.Septic arthritis and infectious flexor tenosynovitis were ruled out.Serial debridement and inflammation control were initiated,followed by staged closure with a skin graft.CONCLUSION Septic-like complications can occur in the absence of infection in severe gout attacks with pus-like discharges due to compartment syndrome and myonecrosis.Cultures can be used to differentiate between gouty attacks,septic arthritis,and infectious tenosynovitis.Involvement of the flexor and extensor muscles,as in this case,is rare.This study contributes to the literature by reporting a rare case of successful fascioto

关键词： Compartment syndrome Extensor compartment Gout Tenosynovitis Case report

Metagenomic approach revealed effects of forest thinning on bacterial communities in the forest soil of Mt. Janggunbong, South Korea

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Journal of Mountain Science 2018年第1期15卷 59-67页

作者： LEE Byeong-Ju eo soo Hyung Department of Forest Resources Kongju National University

The soil microbiome that plays important ecological roles in mountains and forests is influenced by anthropogenic and natural causes.Human activity,particularly harvesting or thinning,affects the soil microbiome in forests by altering environmental conditions,such as vegetation,microclimate,and soil physicochemical properties.The purpose of this study was to investigate the effects on forest thinning on the diversity and composition of the soil bacterial community.From next-generation sequencing results of the 16S rRNA gene,we examined differences in soil bacterial diversity and community composition before and after thinning at Mt.Janggunbong,South Korea.We identified 40 phyla,103 classes,192 orders,412families,947 genera,and 3,145 species from the soil samples.Acidobacteria and Proteobacteria were the most dominant bacterial phyla in the forest soil of Mt.Janggunbong.Soil bacterial diversity measures(richness,Shannon diversity index,and evenness)at the phylum level increased after thinning,whereas species-level taxonomic richness decreased after thinning.Thinning provided new opportunities for bacterial species in Chloroflexi,Verrucomicrobia,Nitrospirae,and other nondominant bacterial taxa,especially for those not found in Mt.Janggunbong before thinning,to settle and adapt to the changing environment.Our results suggested that thinning affected the diversity and composition of soil bacterial communities in forests and mountains.

关键词：森林土壤细菌南朝鲜社区物理化学小气候定序

Intermittent, low-dose, antiandrogen monotherapy as an alternative therapeutic option for patients with positive surgical margins after radical prostatectomy

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Asian Journal of Andrology 2018年第3期20卷 270-275页

作者： kyung Hwa Choi Seung Ryeol Lee Young Kwon Hong Dong soo Park Department Urology CHA Bundang Medical Center CHA University Seongnam Korea.

The aim of the present study was to determine whether oncologic outcomes and adverse events associated with active on/off intermittent antiandrogen monotherapy (daily bicalutamide, 50 mg per day) are comparable with those of standard external beam radiation therapy (EBRT) or combined androgen blockade (CAB) therapy in prostate cancers with positive surgical margins after radical prostatectomy. Two hundred twenty-three patients with positive surgical margins post-radical prostatectomy who underwent active surveillance (AS, n = 32), EBRT without hormone therapy (n = 55), intermittent antiandrogen monotherapy without EBRT (IAAM, n = 50), or CAB without EBRT (n = 86), between 2007 and 2014, were reviewed retrospectively. Pathologic outcomes, biochemical recurrence rates, radiological disease progression, and adverse events were collected from medical records. Biochemical recurrence rates, biochemical recurrence-free survival rates, and radiological recurrence were not different between the groups (P = 0.225, 0.896, and 0.284, respectively). Adverse event rates and severities were lower for IAAM compared with EBRT or CAB (both P < 0.05), but were comparable to those for AS (P = 0.591 and 0.990, respectively). Grade ≥3 adverse events were not reported in the IAAM or AS groups. Erectile dysfunction and loss of libido rates were lower in the IAAM group compared with the EBRT and CAB groups (P = 0.032). Gastrointestinal complications were more frequently reported in the EBRT group (P = 0.008). Active on/off IAAM treatment might be an appropriate treatment option for patients with positive surgical margins after radical prostatectomy. Furthermore, regarding oncologic outcomes, IAAM was comparable to standard EBRT but had a milder adverse event profile.

关键词：治疗学前列腺切除术外科低剂量出租汽车生物化学复发率

Devastating complication of negative pressure wound therapy after deep inferior epigastric perforator free flap surgery:A case report

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World Journal of Clinical Cases 2023年第1期11卷 143-149页

作者： sooA Lim Dong Yun Lee BumSik Kim Jung soo Yoon Yea Sik Han SuRak eo Department of Plastic and Reconstructive Surgery DongGuk University Medical CenterGoYang 10326South Korea

BACKGROUND Thermal injuries on free transferred or replanted tissues resulting from loss of sensibility are an infrequent occurrence.They require immediate and appropriate management before they progress to an irreversible condition.Although negative pressure wound therapy(NPWT)can prevent wound progression by increasing microcirculation,the inappropriate application of NPWT on complicationthreatened transferred and replanted tissues can induce an adverse effect.CASE SUMMARY A 48-year-old woman who underwent immediate breast reconstruction with a deep inferior epigastric artery perforator free flap.While applying a heating pad directly to the flap site,she sustained a deep second to third-degree contact burn over 30%of the transferred flap on postoperative 7 d.As the necrotic changes had progressed,we applied an NPWT dressing over the burned area after en-bloc debridement of the transferred tissues on postoperative 21 d.After 4 d of NPWT application,the exposed fatty tissues of the flap changed to dry and browncolored necrotic tissues.Upon further debridement,we noted that the wound gradually reached total necrosis with a collapsed vascular pedicle of deep inferior epigastric artery.CONCLUSION Although NPWT has been shown to be successful for treating various wound types,the significant risk of NPWT application in short-lasting reconstructed flap wounds after thermal injury should be reminded.

关键词： Negative Pressure Wound Therapy Complications Breast reconstruction Deep inferior epigastric artery perforator Free flap Burn injury Case report

Dynamic modeling and analysis of vortex filament motion using a novel curve-fitting method

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Chinese Journal of Aeronautics 2016年第1期29卷 53-65页

作者： Chang-Joo Kim soo Hyung Park Sang kyung Sung Sung-Nam Jung Department of Aerospace Information Engineering Konkuk UniversitySeoul 05029Republic of Korea

Applications of a novel curve-fitting technique are presented to efficiently predict the motion of the vortex filament, which is trailed from a rigid body such as wings and rotors. The governing equations of the motion, when a Lagrangian approach with the present curve-fitting method is applied, can be transformed into an easily solvable form of the system of nonlinear ordinary differential equations. The applicability of Be′zier curves, B-spline, and Lagrange interpolating polynomials is investigated. Local Lagrange interpolating polynomials with a shift operator are proposed as the best selection for applications, since it provides superior system characteristics with minimum computing time, compared to other methods. In addition, the Gauss quadrature formula with local refinement strategy has been developed for an accurate prediction of the induced velocity computed with the line integration of the Biot–Savart law. Rotary-wing problems including a vortex ring problem are analyzed to show the efficiency, accuracy, and flexibility in the applications of the proposed method.

关键词：曲线拟合方法动态建模拉格朗日插值多项式涡丝常微分方程系统 Bezier曲线毕奥-萨伐尔定律应用程序