Hydrothermal synthesis and application of Ho³⁺-activated NaYbF₄ bifunctional upconverting nanoparticles for <i>in vitro</i> cell imaging and latent fingerprint detection

Du, Peng,Zhang, Peng,Kang, Seong Ho,Yu, Jae Su Elsevier 2017 Sensors and actuators. B Chemical Vol.252 No.-

<P><B>Abstract</B></P> <P>The Ho<SUP>3+</SUP>-activated NaYbF<SUB>4</SUB> upconverting nanoparticles (UCNPs) were synthesized <I>via</I> a facile hydrothermal method and characterized by X-ray diffraction pattern, transmission electron microscope image and upconversion (UC) emission spectrum. Upon the excitation of 980nm light, the as-prepared UCNPs exhibited bright green and red UC emissions corresponding to the (<SUP>5</SUP>F<SUB>4</SUB>,<SUP>5</SUP>S<SUB>2</SUB>) → <SUP>5</SUP>I<SUB>8</SUB> and <SUP>5</SUP>F<SUB>5</SUB> → <SUP>5</SUP>I<SUB>8</SUB> transitions of Ho<SUP>3+</SUP> ions, respectively. The cell toxicity test result revealed that the synthesized UCNPs possessed remarkable low cytotoxicity. With the introduction of the resultant UCNPs into the HeLa cells, intense green and red UC emissions were observed, indicating that the HeLa cells can be labeled by the obtained UCNPs and they had potential application in live cell imaging. Additionally, the practicality of the resultant UCNPs for latent fingerprint was also systematically investigated. These results suggest that the Ho<SUP>3+</SUP>-activated NaYbF<SUB>4</SUB> UCNPs are very promising as a bifunctional nanoparticle for <I>in vitro</I> cell imaging and latent fingerprint detection.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Under 980nm light excitation, the synthesized UCNPs emitted eye-visible emissions. </LI> <LI> The resultant UCNPs possessed low cell toxicity. </LI> <LI> The as-prepared UCNPs were suitable for live cell imaging. </LI> <LI> The synthesized UCNPs have promising application in latent fingerprint detection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P> <I>In vitro</I> upconversion luminescence imaging of HeLa cells under the irradiation of 980nm light; Photographs of latent fingerprint stained by NaYbF<SUB>4</SUB>:Ho<SUP>3+</SUP> UCNPs under 980nm light excitation.</P> <P>[DISPLAY OMISSION]</P>

등척성 신전운동 시 요부근의 근 활성도

유원규,정영종,이재호,김창인 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.1

Back extension exercises have been used for rehabilitation of the injured low back, prevention of injury, and fitness training programs. However, excessive loading on low back can exacerbate existing structural weakness. The purpose of this study was to compare muscle activity of low back muscles during back extension exercises. Twenty healthy male subjects were evaluated, Electromyographic (EMG) activities of low back muscles at L1 and L5 level were recorded during seven different back extension exercises and two reference tasks by surface EMG and saved for data analysis. Reference tasks of lifting 20% and 40% of their body weight were included for comparison. The result were as follows: 1) Single-arm extension and single-leg extension exercises on quadruped position appeared to constitute a low-risk exercise for initial extensor strengthening. 2) When arm extension was combined with contralateral leg extension on quadruped position, EMG activities of low back muscles were increased, 3) EMG activity of low back muscles was highest during the trunk extension exercises on prone position. 4) EMG activities of low back muscles during arm and leg extension exercises on quadruped position were less than those of reference task of lifting 40% of their body weight. These results have important implications for progressive back extensor muscle

Al_(0.24)Ga_(0.76)As/GaAs HEMT 구조에서의 표면 광전압에 관한 연구

유재인,김종수,배인호,신영남,박성배 대구대학교 기초과학연구소 2000 基礎科學硏究 Vol.16 No.2

We report a surface photovoltage(SPV) study of Al_(0.24)Ga_(0.76)As/GaAs HEMT structure grown by molecular beam epitaxy. The energies of Eo transition for GaAs and Al_(0.24)Ga_(0.76)As were 1.41 and 1.71 eV, respectively. These values were in good agreement with photo reflectance(PR) measurement. As the frequency is increased from 25 to 55 Hz, the intensity of SPV signal is gradually reduced. Meanwhille, the intensity of SPV signal gradually increased as the temperature increased from 100 K to room temperature. From the former, the surface photovoltage of Al_(0.24)Ga_(0.76)As layer is 8.61 mV, which is about 1.4 times smaller than that of GaAs. This is due to influence of carrier mobility.

Classification과 Ordination에 依한 俗離山 森林群集의 分析

兪在殷,宋鎬京 忠南大學校 環境問題硏究所 1989 環境硏究 Vol.7 No.-

Vegetational data from Mt Sokri in central Korea were analysed in relation to 17 environmental variables. Two multivariate methods were applied two-way indicator species analysis (TWINSPAN) for classification and detrended canonical correspondence analysis (DCCA), a recent technique which extracts ordination axes that can be related to environmental factors. The relationship between the distribution of dominant species of forest vegetation and soil condition in Mt Sokri was investigated by analyzing altitude and soil nutrition gradient. Quercus mongolica forest was distributed in the high altitude and good nutrition area, Quercus serrata-Acer pseudo-sieboldianum forest in the medium altitude and good nutrition area, Quercus variabilis and Quercus serrata forest in the medium altitude and medium nutrition area, and Pinus densiflora forest in the low altitude and poor nutrition area. Quercus mongolica forests were distributed in the xeric parts of northern part of warm-temperate deciduous boardleaf forest and in the mesic parts of cool-temperate deciduous boardleaf forest in Korea. The dominant compositional gradient related to altitude.

Pt계 촉매를 이용한 직접 개미산 연료전지의 특성 연구

유재근,이효송,김진용,김기호,이영우 충남대학교 공업교육연구소 2005 論文集 Vol.27 No.1

Direct Formic Acid Fuel Cells (DFAFCs) are potential alternative power sources for potable devices such as cellular phones, personal digital assistants (PDA) and laptop computers. In this study, we investigated the effect of the anode catalysts on the performance of direct formic acid fuel cell. We made the Pt-Pd catalysts using deposition method for the investigation of the fuel cell performance as a change of temperature and oxidant. Fuel cell with Pt-Pd anode catalyst showed the performance of 120 mW/㎠at room temperature. This result was much higher value than that of Pt-Ru catalyst which showed the best performance of commercial catalyst in our previous works. For this reason, we can conclude that the Pt-Pd catalyst is an excellent material for the oxidation of formic acid.

철을 오염시킨 n-GaAs의Photoreflectance에 관한 연구

유재인,문영희,이동울,이정열,배인호,장광수 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-

We investigated the variation of PR signals for n-GaAs surface treated with Fe as annealing method. The samples were annealed by isochronal(200∼600 ℃, 10 min) and isothermal(300 ℃, 10 ∼60 min) method. In PR signals measured from isochronal annealed samples, the rate of intensity decreasing for n-GaAs was 49%, and that for n-GaAs surface treated with Fe was 66%. We assumed that the large amount of decreasing intensity for Fe contaminated sample caused by decreasing carrier density due to increasing of ?? neutral acceptor at higher annealing temperature. In PR signals measured from isothermal annealed samples, the signals for annealed n-GaAs decreased with increasing annealing time, and the signals for n-GaAs surface treated with Fe continuously increased with increasing annealing time. It can be assumed that the increasing of PR intensity for Fe contaminated samples as annealing time caused by the diffusion of Fe atoms from the surface.

방위에 따른 속리산과 오대산의 산림군락 구조분석

유재은,이정호,권기원 명지대학교 자연과학연구소 2004 자연과학논문집 Vol.23 No.-

본 연구는 방위에 따른 속리산 및 오대산 삼림식생을 분석하고자 하였다. 속리산 조사구와 오대산 조사구를 방위에 따라 출현하는 주요 종의 중요치를 살펴보면 속리산의 경우 북향에서는 쇠물푸레, 벚나무, 개옻나무, 굴피나무, 참회나무 등 8종에 중요치가 높게 분포하고 있음을 볼 수 있고, 동향에서는 소나무, 고로쇠나무, 산초나무, 소태나무, 작살나무 등 6종이, 남향에서는 굴참나무, 졸참나무, 생강나무, 물푸레나무, 짝자래나무 등 13종이, 서향에서는 신갈나무, 당단풍, 쪽동백나무, 노린재나무, 철쭉 등 13종에 중요치가 높게 출현한다. 오대산의 경우를 보면 북향에서는 당단풍, 까치박달, 거제수나무, 음나무, 잣나무등 18종이 중요치가 높게 분포하고 있음을 볼 수 있고, 동향에서는 전나무, 소나무, 느릅나무, 산벚나무, 들메나무 등 5종이, 남향에서는 신간나무, 물푸레나무, 철쭉, 진달래, 개벚지나무 등 7종이, 서향에서는 피나무, 고로쇠나무, 난티나무, 쪽동백나무, 황벽나무 등 10종이 중요치가 높게 출현함을 알 수 있다. 이러한 결과로 볼 때 속리산에서는 남향과 서향이 각각 13종씩 26종으로 북향과 동향의 14종 보다 배에 가까운 많은 수의 나무들이 중요치가 높게 출현하고 있는 것에 반하여, 오대산에서는 북향과 동향이 각각 18종과 5종씩 23종으로 남향과 서향의 17종 보다 월등히 많게 출현함을 알 수 있다. 이와 같은 결과는 속리산과 오대산이 정반대의 현상으로 속리산이 해발고가 낮고 난온대성 수종의 우위를 점하는 것에 비하여 오대산은 해발고가 높고 냉온대성 수종이 우위를 차지하고 있는데서 오는 현상으로 보여진다. This study was to research environment of the forest vegetation structure according to the directions in Mt. Sokri and Odae. According to direction, the importance value of 8 species of Fraxinus sieboldiana, Prunus serrulate var. spontanea, Rhus trichocarpa ect. appeared highly on the north, 6 species of Pinus densiflora, Acer mono, Zanthoxylum schinifolium ect. highly appeared on the east, 13 species of Quercus variabilis, Quercus serrata, Lindera obtusiloba ect. highly appeared on the south, 13 species of Quercus mongolica, Acer pseudo-sieboldianum, styrax obassia ect. highly appeared appreared on the west in Mt. Sokri. The importance value of 18 species of Acer pseudo-sieboldianum, Carpinus cordata, Betula costata ect. highly appeared on the north, 5 species of Abies holophylla, Pinus densiflora, Ulmus dabidiana var. japonica ect. highly appeared on the east, 7 species of Quercus on the south, 10 species of Tilia amurensis, Acer mono, Ulmus laciniata ect. highly appeared on the west in Mt. Odae

충청도지역의 노거수 자원

유재은,이정호 명지대학교 자연과학연구소 2003 자연과학논문집 Vol.22 No.-

충청도지역의 노거수 자원 현황을 알아보기 위하여 1999년 3월부터 2003년 12월 10일까지 26개 시·군에 대한 현황조사와 조사된 자료분석을 통하여 다음과 같은 결과를 얻을 수 있었다. 1. 대전광역시를 포함하는 충청도지역 내에는 수령이 100년 이상 된 노거수가 31종류에 2,058본이 분포하고 있음을 알 수 있었다. 2. 이 지역 26개 시·군 중 가장 많은 노거수가 분포되어 있는 곳은 청원·청주시로 9종 193본으로 전체의 9.38%에 이르고, 그 다음이 공주시로 7종 171본이고 8.34%이며 세 번째가 괴산군으로 9종 145본으로 7.05%에 달한다. 3. 이 지역에서 나이가 가장 많은 것으로 알려진 나무는 은행나무로 1,300년 이상이고 충청남도 부여군 내산면 주암리 125번지에 있고, 백제 성왕 때 심겨진 것으로 알려져 있다. 4. 이 지역에 분포하고 있는 상록수는 소나무외 7종 103본으로 전체의 5.00%에 불과하고 낙엽수는 느티나무외 22종 1,955본으로 95.00%에 이른다. 5. 보호관리 유형별로는 정자목이 1.392본 67.64%로 제일 많고 그 다음이 풍치목으로 358본 17.40%이며 세 번째가 당산목으로 244본 11.86%을 차지한다. 6. 이 지역에 분포하고 있는 31개 수종 가운데 상위 5개 수종은 느티나무 1,505본 73.13%, 은행나무 179본 8.70%, 팽나무 120본 5.83%, 왕버들 86본 4.18% 그리고 소나무 50본 2.43% 순이고 이들 5개 수종이 차지하는 분포비율은 94.27%에 이른다. 7. 노거수의 수령별 분포는 500년생 이하가 1,896본으로 92.13%이고 501년생 이상이 162본 7.87%로 500년생 이하가 대부분을 차지한다. 8. 경인지역에서 볼 수 없었던 노거수로서의 왕버들이 이 지역에서 86본 4.18%가 분포하고 있음은 의미 있는 일이라고 생각된다. We have surveyed the distribution of aged-big trees which is growing in 26 cities and subprefecture of Chungcheong prefecture by on-the-spot studying from March of 1999 to December 10th of 2003. The results analyzed from the data are as follows. (I) In Chungcheong prefecture including Daejeon, 2,058 trees were counted as aged-big trees over 100 years old and they were classified 31 kinds of species. (2) 9 species (193 trees) of 9.38% and 7 species (171 trees) of 8.34% were recorded in Cheongwon. Cheongju city and Gongju city, respectively and then 9 species (145 trees) of 7.05% were recorded in Goisan. (3) The oldest tree was estimated to have the age over 1,300 years old, which had been planted in 125 Juamri, Naesanmyon, Buyoegun, Chungcheong Namdo, Korea. (4) The evergreen including Pinus densiflora in this area is 7 species accounted for 5.00% (103 trees) and deciduous with 22 species including Zelkova serratu occupied 95.00% (1,955 trees). (5) Shadow tree 1,392 trees for 67.64%, the Landscape tree 358 trees for 17.40% and the Village keeping tree (God tree) 224 trees for 11.86% have to be protected and managed. (6) The top 5 species of 31 species in this area are Zelkova serrutu (73.13%), 1,505 trees, Ginkgo bilobu (8.70%) 179 trees, Celtis japonicu (5.83%) 120 trees, Sulix glundulosu (4.18%) 86 trees and Pinus densiflora (2.43%) 50 trees. And their proportions was accounted for 94.27% of the distribution rates. (7) The aged-big tree under 500 years old are 1,896 trees occupied 92.13%, over 500 years old are 162 trees occupied 7.87%. (8) It is very meaningful that Salix glandulosa which did not reveal in Kyong-In Area are 86 trees occupied 4.18%.

크론병에 대한 CoPPLX의 방어효과에 대한 연구

이호학,김유림,문창기,이재일,양병윤,김종수,이정민,정재혁,안석진,박상준,김윤권,김소연,김영중,조민구,최영자,장성조 圓光大學校 醫科學硏究所 2005 圓光醫科學 Vol.20 No.1

기종성 방광염

인영호,유지형,성락희,정재용,노충희 인제대학교 2008 仁濟醫學 Vol.29 No.-

Emphysematous cystitis (EC) is a rare complicated lower urinary tract infection (UTI)characterized by air within the bladder wall and lumen. The disease is most common in middle-aged diabetic women. Patients with chronic UTI, indwelling urethral catheters, urinary tract outlet obstruction or neurogenic bladders are predisposed to complicated UTI such as EC. Most patients can be managed by adequate bladder drainage and appropriate antibiotics coverage and operation is needed very rarely. We report a diabetic women with EC who underwent partial cystectomy.