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( Ji-seon Jang ),( Wan-seok Seo ),( Bon-hoon Koo ),( Hey-geum Kim ),( Seok-ho Yun ),( So-hey Jo ),( Dae-seok Bai ),( Young-gyo Kim ),( Eun-jin Cheon ) 영남대학교 의과대학 2024 Yeungnam University Journal of Medicine Vol.41 No.1
Background: Although Korea ranks first in the suicide rate of elderly individuals, there is limited research on those who attempt suicide, with preventive measures largely based on population-based studies. We compared the demographic and clinical characteristics of elderly individuals who attempted suicide with those of younger adults who visited the emergency department after suicide attempts and identified the factors associated with lethality in the former group. Methods: Individuals who visited the emergency department after a suicide attempt from April 1, 2017, to January 31, 2020, were included. Participants were classified into two groups according to age (elderly, ≥65 years; adult, 18-64 years). Among the 779 adult patients, 123 were elderly. We conducted a chi-square test to compare the demographic and clinical features between these groups and a logistic regression analysis to identify the risk factors for lethality in the elderly group. Results: Most elderly participants were men, with no prior psychiatric history or suicide attempts, and had a higher prevalence of underlying medical conditions and attributed their attempts to physical illnesses. Being sober and planning suicide occurred more frequently in this group. In the elderly group, factors that increased the mortality rate were biological male sex (p<0.05), being accompanied by family members (p<0.05), and poisoning as a suicide method (p<0.01). Conclusion: Suicide attempts in elderly individuals have different characteristics from those in younger adults and are associated with physical illness. Suicides in the former group are unpredictable, deliberate, and fatal. Therefore, tailored prevention and intervention strategies addressing the characteristics of those who are elderly and attempt suicide are required.
토양으로부터 분리한 Bacillus agaradhaerens DK-2386 균주가 생산하는 Xylanase의 특성
최지휘 ( Ji Hwi Choi ),박영서 ( Young Seo Park ),이형재 ( Hyungjae Lee ),배동훈 ( Dong Hoon Bai ) 한국미생물생명공학회(구 한국산업미생물학회) 2015 한국미생물·생명공학회지 Vol.43 No.4
Bacillus agaradhaerens 균주의 효소를 정제하여 그 특성을 확인하였다. 균주가 생산하는 xylanase를 70% ammonium sulfate로 침전하고 CM-sepharose ion exchange chromato- graphy와 ultrafiltration(PM-10)을 행하여 16.7%의 수율과 6.7배의 정제도를 지니는 효소를 얻을 수 있었으며 SDSPAGE를 통하여 23 kDa의 분자량을 갖는 효소임을 확인하였다. 효소의 최적 pH는 6.0으로서 sodium phosphate buffer에서 24시간까지 안정하였으며, 최적반응온도는 60oC, EDTA의 첨가 시 효소활성이 증가되었고 40oC에서 24시간까지 안정하였다. 효소는 xylan만을 기질로 이용할 수 있었으며 Birchwood xylan에 대하여 최대 활성을 나타내었고 Vmax는 49,724 μM/min, Km은 6.08 mg/ml로 확인되었다. The optimum conditions for the production of xylanase from Bacillus agaradhaerens DK-2386 have been previously investigated. In this study xylanase was purified by ammonium sulfate precipitation and CM-sepharose ion exchange chromatography. The molecular mass of the xylanase as determined by SDS-PAGE was 23 kDa in a form of monomeric enzyme. The optimum pH and temperature for xylanase activity was 6.0 and 60oC, respectively. Xylanase activity was increased by the addition of EDTA and then stabilized at 40oC for 24 h. The maximum xylanase activity was obtained when Birchwood xylan was used as a substrate and the Vmax and Km were 49,724 μmol/min and 6.08 mg/ml, respectively.