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우치 법랑질의 레이저 및 산부식처리 후 결합강도에 관한 실험적 연구
차경,김재곤,백병주,이승익 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.1
The purpose of this study was to determine the optimal energy level to the enamel surface of bovine teeth when they are irradiated by pulsed Nd:YAG laser and was to compare acid etching with laser etching. For the study, the labial enamel surfaces of extracted intact bovine teeth were irradiated with normal pulsed Nd:YAG laser by six different energy of 30, 60, 80, 100, 120 and 160mJ. The author observed to enamel surface with a scanning electron microscope and measured the shear bond strength between etched enamel surface and composite resin by universal testing machine with a crosshead speed of 1mm/min. and investigated difference acid and laser etching group. The obtained results were as followng : 1. The shear bond strength were 24.26 MPa in Group Ⅰ, 5.50 MPa in Group Ⅱ, 5.77 MPa in Group Ⅲ, 5.90 MPa in Group Ⅳ, 6.01 MPa in Group Ⅴ, 6.34 MPa in Group Ⅵ, 6.24 MPa in Group Ⅶ. Acid etching Group(GroupⅠ) was showed higher bond strength than other laser etching groups(p<0.05). 2. In laser etching groups, the shear bond strength was highest in 120mJ energy level(Group Ⅵ). 3. Group Ⅱ, Ⅲ and Ⅳ, below 80mJ energy level were observed only microcrack and small projection in 80mJ energy level(Group Ⅳ) and group Ⅴ, Ⅵ and Ⅶ were observed small pore and crater in 5∼9㎛ diameter, especially in 120mJ energy level(Group Ⅵ).
Clinical characteristics of in situ pulmonary artery thrombosis in Korea
( Seung Ick Cha ),( Keum Ju Choi ),( Seung Soo Yoo ),( Jaehee Lee ),( Shin Yup Lee ),( Chang Ho Kim ),( Jae Yong Park ) 대한결핵 및 호흡기학회 2015 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.120 No.0
Objectives: Little is known regarding the clinical features and course of in situ pulmonary artery thrombosis (PAT). The aim of the present study was to investigate the clinical characteristics of PAT. Methods: Patients with PAT were retrospectively identified from a tertiary referral center in South Korea. A control group consisted of patients with pulmonary embolism (PE) in whom the right or left pulmonary artery was the largest PE-involved site. We compared various clinical parameters between the two groups. Results: Of 23 PAT patients, the most common underlying condition was tuberculosis (TB)-destroyed lung (11 [47.8%]), followed by pulmonary artery stump after lobectomy or pneumonectomy (7 [30.4%]). In all patients except one, PAT was located in the right or left pulmonary artery. Computed tomography scans demonstrated that clots were completely or partially resolved less frequently in the PAT group than in the control group (4 [25%] versus 62 [90%], p<0.001). In the PAT group, three of seven patients (43%) who had undergone anticoagulation therapy exhibited improvement, and one of nine (11%) who had not received anticoagulation therapy experienced improvement; however, the difference was not significant. Conclusions: TB-destroyed lung was the most common underlying condition in Korean PAT patients, followed by pulmonary artery stump after lung resection. The clots in patients with PAT were mostly located in the right or left pulmonary artery, and clot resolution was less frequent in the PAT group compared to the PE group.
Clinical characteristics of pulmonary embolism with concomitant pneumonia
Cha, Seung-Ick,Choi, Keum-Ju,Shin, Kyung-Min,Lim, Jae-Kwang,Yoo, Seung-Soo,Lee, Jaehee,Lee, Shin-Yup,Kim, Chang-Ho,Park, Jae-Yong YEAR Wolters Kluwer Health, Inc. All rights reserv 2016 Blood coagulation & fibrinolysis Vol.27 No.3
<P>Although pneumonia is associated with an increased risk of venous thromboembolism, patients with pulmonary embolism and concomitant pneumonia are uncommon. The aim of the present study was to investigate the clinical features of pulmonary embolism with coexisting pneumonia. We retrospectively compared clinical, radiologic and laboratory parameters between patients with pulmonary embolism and concomitant pneumonia (pneumonia group) and those with unprovoked pulmonary embolism (unprovoked group), and then between the pneumonia group and those with pulmonary infarction (infarction group). Of 794 patients with pulmonary embolism, 36 (5%) had coexisting pneumonia and six (1%) had no provoking factor other than pneumonia. Stroke was significantly more common in the pneumonia group, than either the unprovoked group or the infarction group. In the pneumonia group, fever was significantly more common and serum C-reactive protein levels were significantly higher. By contrast, central pulmonary embolism and right ventricular dilation on computed tomography were significantly less frequent in the pneumonia group. In addition, an adverse outcome due to pulmonary embolism was less common in the pneumonia group than in either of the other two groups. The coexistence of pulmonary embolism and pneumonia is rarely encountered in clinical practice, especially without the presence of other factors that could provoke venous thromboembolism and is commonly associated with stroke. It is characterized by lower incidences of central pulmonary embolism and right ventricular dilation and by a lower rate of adverse outcomes due to pulmonary embolism itself.</P>
A new approach of digital PCR system for non-invasive prenatal screening of trisomy 21
Lee, Seung Yong,Kim, Seung Jun,Han, Sung-Hee,Park, Joon Soo,Choi, Hyo Jung,Ahn, Jeong Jin,Oh, Moon-Ju,Shim, Sung Han,Cha, Dong Hyun,Hwang, Seung Yong Elsevier 2018 Clinica chimica acta Vol.476 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Non-invasive prenatal screening (NIPS) of trisomy 21 (T21) using digital PCR (dPCR) with several advantages will be very effective. Here, we developed a dPCR system for T21 screening which allows high sensitivity and real-time diagnosis and thus overcome sequence based analysis.</P> <P><B>Methods</B></P> <P>Cut-off value was established using DNA extracted from all 157 T21 negative samples including 47 pregnant woman samples and 3 T21 positive pregnant woman samples extracted from 4 different sample types. To increase the portion of the cell-free fetal DNA (cffDNA) in maternal cell-free DNA (cfDNA), a size selection method was devised. We evaluated the clinical reliability of NIPS using dPCR through analysis of 877 pregnant woman samples.</P> <P><B>Results</B></P> <P>We could demonstrate the possibility of NIPS using dPCR performed by applying cut-off value and size selection method. The overall accuracy was derived at 99.66% using 877 pregnant woman plasma samples.</P> <P><B>Conclusion</B></P> <P>Our results showed that dPCR can meet the requirements for NIPS for T21. It is relatively inexpensive, easy to use in a screening method and compatible with ethical concerns regarding access to nucleotide sequence information. This study may be a basic data for the development of population-wide screening for T21 in pregnant women.</P> <P><B>Highlight</B></P> <P> <UL> <LI> NIPS for trisomy 21 using dPCR is easy to apply and results are obtained quickly </LI> <LI> We have developed the technology using digital PCR to screening for trisomy 21 </LI> <LI> We evaluated the accuracy of development technology using clinical samples </LI> <LI> This technique can be extended to the detection of other aneuploidies using cfDNA </LI> </UL> </P>
브로콜리(Brassica oleracea var. italica)의 온도 스트레스 평가를 위한 다중 센서 모니터링
차승주 ( Seung-ju Cha ),박현준 ( Hyun Jun Park ),이주경 ( Joo-kyung Lee ),권선주 ( Seon-ju Kwon ),지효경 ( Hyo-kyung Jee ),백현 ( Hyun Baek ),김한나 ( Han-na Kim ),박진희 ( Jin Hee Park ) 한국응용생명화학회 2020 Journal of Applied Biological Chemistry (J. Appl. Vol.63 No.4
Several sensors have been developed for soil and plants to assess plant stress due to climate change. Therefore, the objective of the study is to nondestructively evaluate temperature stress on plant by monitoring climatic and soil conditions and plant responses using various sensors. Plant responses were monitored by electrical conductivity in plant stem and sap flow rate. Electrical conductivity in plant stem reflects the physiological activity of plants including water and ion transport. Fully grown Brassica oleracea var. italica was exposed to 20/15 ℃ (day/night) with 16 h photoperiods as a control, low temperature 15/10 ℃, and high temperature 35/30 ℃ while climatic, soil, and plant conditions were monitored. Electrical conductivity in plant stem and sap flow rate increased during the day and decreased at night. Under low temperature stress, electrical conductivity in plant stem of Brassica oleracea var. italica was lower than control while under high temperature stress, it was higher than control indicating that water and ion transport was affected. However, chlorophyll a and b increased in leaves subjected to low temperature stress and there was no significant difference between high temperature stressed leaves and control. Free proline contents in the leaves did not increase under low temperature stress, but increased under high temperature stress. Proline synthesis in plant is a defense mechanism under environmental stress. Therefore, Brassica oleracea var. Italica appears to be more susceptible to high temperature stress than low temperature.