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권두한,정태화,남효진,송은영,변시명,김희정,김경아,이홍수 THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 1998 Journal of biomedical laboratory sciences Vol.4 No.2
과산화 효소와 포도당 산화효소의 효소반응을 이용하여 혈액 중 당을 측정하는 혈당측정용 스트립을 개발하였다. 멤브레인에 포도당 산화효소와 과산화 효소, 색원체를 건조 처리하면 혈당이 멤브레인에 처리된 포도당 산화효소와 즉각 반응하여 과산화 수소를 발생하고 발생된 과산화 수소가 과산화 효소와 반응하여 착색물을 형성한다. 제조된 스트립은 혈액과 접촉하면 반응시간 2∼3분 이내에 0∼800mg/dl의 혈당에 대하여 농도에 따라 연 녹, 청녹, 짙은 청색을 나타내며 이때 민감도는 40 mg/dl이었다. 육안용 혈당 스트립을 이용하여 정상을 포함한 당뇨 환자의 혈당 농도를 측정한 결과 Ames사와 BM사에서 시판하고 있는 제품과 유사한 결과를 얻을 수 있었다. 본 연구에서 개발된 스트립이 자동 분석기기의 재료로 활용될 수 있는지 여부를 알아보기 위하여 분광 비색계로 발색 반응의 최적 파장을 분석하고 최적 파장에서 각 혈당 농도별 반사 밀도를 측정하여 검정선을 얻었다. 이 검정선에 의해 임상 혈청시료의 혈당 농도를 측정한 결과 일본의 Kyoto Daiichi사의 혈액 분석시스템과 유사한 결과를 얻었다. 이로서 본 연구에서 개발한 혈당 스트립을 이용하여 혈액 중 혈당량을 육안으로 측정할 수 있음은 물론 자동 분석기기의 기본 시료로 이용될 수 있음을 확인할 수 있었다. We have developed a simple and accurate strip test that measures the blood glucose level semiquantitatively by visual observation, or qualitatively by using UltraScan spectrocolorimeter. The strip has solid phase reagents, including glucose oxidase, peroxidase, chromogen, affixed to a plastic support. The strip test is capable of measuring blood glucose level in the range of 0∼800 mg/dl and generating the results within 2 to 3 minutes. Human blood specimens obtained from normal individuals and the diabetic patients were evaluated by the new blood glucose strip and by the kit supplied by other commercial products. The test results exhibit the correlation coefficient of 0.964. The new test strip is proven simple and accurate, and it offers an alternative to the commercially available glucose tests.
Kwon Hyo Eun,Ko Nayeon,Yuk Doyoung,Choi Seo Won,Koh Seong-Eun 대한재활의학회 2023 Annals of Rehabilitation Medicine Vol.47 No.5
Objective: To systematically review the effects of protein supplementation in older adults with sarcopenia.Methods: A systematic literature search was conducted in PubMed, Cochrane Library, and Embase databases until May 2023. The inclusion criteria were as follows: (1) randomized controlled trials with a quantitative study design; (2) studies with a study group of older adults with sarcopenia; (3) studies comparing muscle mass, muscle strength, and performance of older adults with sarcopenia after protein supplementation; and (4) studies published up to May 2023.Results: Six retrospective comparative studies, including 715 patients, met the inclusion criteria. The nutritional supplementation group exhibited significant improvement in appendicular skeletal muscle mass (standardized mean difference [SMD]=0.41; 95% confidence interval [CI], 0.24–0.58; p<0.001; I<sup>2</sup>=1%), while handgrip strength (SMD=0.37; 95% CI, -0.32–1.07; p=0.29; I<sup>2</sup>=94%) and Short Physical Performance Battery (SPPB) (SMD=0.35; 95% CI, -0.47–1.18; p=0.40; I<sup>2</sup>=94%) showed a tendency for improvement.Conclusion: Nutritional supplementation with protein increased appendicular muscle mass in older adults with sarcopenia and improved handgrip strength and SPPB scores.
Kwon, Hyo-Eun,Kwon, Soon Jin,Park, Sung-Joon,Shin, Min Gyu,Park, Sang-Hee,Park, Min Sang,Park, Hosik,Lee, Jung-Hyun Elsevier 2019 Separation and purification technology Vol.212 No.-
<P><B>Abstract</B></P> <P>A high performance thin film composite (TFC) forward osmosis (FO) membrane was prepared using a hydrophilic polyacrylonitrile (PAN) support with a tailored structure <I>via</I> a newly devised, aromatic solvent (toluene)-based interfacial polymerization (TIP) technique. The use of toluene as the organic solvent promoted amine diffusion toward the organic phase and the subsequent reaction, leading to the formation of an ultrathin (highly permeable) and highly dense (highly selective) polyamide selective layer on the PAN support, which improved membrane performance. In addition, a relatively thin (∼80 μm) and finger-like porous support structure embedded with a nonwoven fabric was favorable for facilitating mass transport in the support. As a result, the TFC FO membrane prepared <I>via</I> TIP showed ∼2.1 times higher FO water flux and ∼68% lower specific salt flux than the membrane prepared <I>via</I> conventional aliphatic solvent-based interfacial polymerization (IP) in FO mode. Importantly, our TIP-assembled membrane exhibited superior FO performance over commercial and other lab-made membranes. Our strategy provides a facile solution to overcome the technical limitations of the conventional IP method by enabling the fabrication of high performance PA layers on hydrophilic supports, expanding the application spectrum of TFC membranes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TFC FO membranes are fabricated using aromatic organic solvents (toluene). </LI> <LI> An ultrathin and highly dense PA layer was formed on a hydrophilic PAN support. </LI> <LI> The prepared membranes show FO performance exceeding commercial membranes. </LI> <LI> This is due to high permeability and excellent selectivity of the prepared membrane. </LI> <LI> Aromatic solvent greatly promotes MPD diffusion by increased miscibility with water. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Hyo Eun,Koo, Bon-Kwon,Park, Kyung-Woo,Paeng, Jin Chul,Lee, Hae-Young,Kang, Hyun-Jae,Kim, Hyo-Soo Kluwer Academic Publishers 2012 INTERNATIONAL JOURNAL OF CARDIOVASCULAR IMAGING Vol.28 No.8
<P>Different angiographic patterns and restenosis rate may affect diagnostic value of single-photon emission computed tomography (SPECT) in the era of drug-eluting stents (DES). We aimed to determine the ability of myocardial SPECT to detect in-stent restenosis (ISR) in patients treated with DES compared to that of patients treated with bare metal stent (BMS). We evaluated 228 consecutive patients who underwent 6 months follow-up SPECT and coronary angiography (CAG) after stent implantation. In 228 patients, 354 vessels were treated with stent implantation (BMS, n = 105; DES, n = 249) and 65 (18.4%) vessels showed ISR (angiographic % diameter stenosis 50%) at the 6-month follow-up CAG. In patients with BMS-ISR (n = 37), restenosis was primarily diffuse (70.3%), whereas patients with DES-ISR (n = 28) exhibited more focal restenosis (53.6%, p = 0.028). The sensitivity and specificity of myocardial SPECT did not differ significantly between patients with BMS and those with DES (BMS vs. DES: sensitivity 56.8 vs. 39.3%, p = 0.163; specificity 72.1 vs. 76.5%, p = 0.460). Evaluation of 71 false positive and 33 false negative lesions showed that the most common cause of false-positive results in SPECT was the perfusion decrease which improved but not disappeared compared with the baseline (46 among 71 vascular territories). Despite different patterns of restenosis and ISR rates, the diagnostic value of SPECT did not differ between BMS and DES. Further study looking at ISR in larger number of patients and using other protocol such as Fleming-Harrington Redistribution Wash-in Washout may give additional information.</P>