1.Clinical Application of Near Infrared Spectroscopy.
Journal of the Korean Pediatric Society 1996;39(5):595-602
No abstract available.
Spectrum Analysis*
2.Current views on surface enhanced Raman spectroscopy in microbiology.
Xiaoxiao JIA ; Jing LI ; Tian QIN ; Aihua DENG ; Wenjun LIU
Chinese Journal of Biotechnology 2015;31(5):611-620
Raman spectroscopy has generated many branches during the development for more than 90 years. Surface enhanced Raman spectroscopy (SERS) improves SNR by using the interaction between tested materials and the surface of rough metal, as to quickly get higher sensitivity and precision spectroscopy without sample pretreatment. This article describes the characteristic and classification of SERS, and updates the theory and clinical application of SERS. It also summarizes the present status and progress of SERS in various disciplines and illustrates the necessity and urgency of its research, which provides rationale for the application for SERS in microbiology.
Microbiology
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Spectrum Analysis, Raman
3.Clinical Applications of Magnetic Resornance Spectroscopy in Newborn.
Journal of the Korean Pediatric Society 1994;37(7):883-889
No abstract available.
Humans
;
Infant, Newborn*
;
Spectrum Analysis*
4.Comparison of removal torques between laser-treated and SLA-treated implant surfaces in rabbit tibiae.
Nam Seok KANG ; Lin Jie LI ; Sung Am CHO
The Journal of Advanced Prosthodontics 2014;6(4):302-308
PURPOSE: The purpose of this study was to compare removal torques and surface topography between laser treated and sandblasted, large-grit, acid-etched (SLA) treated implants. MATERIALS AND METHODS: Laser-treated implants (experimental group) and SLA-treated implants (control group) 8 mm in length and 3.4 mm in diameter were inserted into both sides of the tibiae of 12 rabbits. Surface analysis was accomplished using a field emission scanning electron microscope (FE-SEM; Hitachi S-4800; Japan) under x25, x150 and x1,000 magnification. Surface components were analyzed using energy dispersive spectroscopy (EDS). Rabbits were sacrificed after a 6-week healing period. The removal torque was measured using the MGT-12 digital torque meter (Mark-10 Co., Copiague, NY, USA). RESULTS: In the experimental group, the surface analysis showed uniform porous structures under x25, x150 and x1,000 magnification. Pore sizes in the experimental group were 20-40 mm and consisted of numerous small pores, whereas pore sizes in the control group were 0.5-2.0 mm. EDS analysis showed no significant difference between the two groups. The mean removal torque in the laser-treated and the SLA-treated implant groups were 79.4 Ncm (SD = 20.4; range 34.6-104.3 Ncm) and 52.7 Ncm (SD = 17.2; range 18.7-73.8 Ncm), respectively. The removal torque in the laser-treated surface implant group was significantly higher than that in the control group (P=.004). CONCLUSION: In this study, removal torque values were significantly higher for laser-treated surface implants than for SLA-treated surface implants.
Rabbits
;
Spectrum Analysis
;
Tibia*
;
Torque*
5.Determination of trace elements in serum using inductively coupled plasma atomic emission spectrometry.
Jong Wan KIM ; Jon Kee LEE ; Chan Bin IM ; Gye Chul KWON ; Sun Hoe KOO ; Jong Woo PARK ; Myung Sub GAN ; Heung Bin LIM
Korean Journal of Clinical Pathology 1993;13(2):173-180
No abstract available.
Plasma*
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Spectrum Analysis*
;
Trace Elements*
6.The situation of microorganism and antibacterial spectrum in the ENT department of the Pediatric hospital I during 1996-1997
Journal of Vietnamese Medicine 2002;269(2):41-44
In 682 bacteriological specimens, the positives are 71.4%. Acute otitis media, chronic otitis media, chronic maxillary sinusitis, acute tonsillitis and chronic tonsillitis are the most positive specimens. In general, the most effective antibiotic are: augmentine, ceftriaxone in acute otitis media, and vancomycine, gentamycine in chronic otitis media, and augmentin, gentamycine in chronic maxillary sinusitis, cefortaxime, ceftriaxone in acute tonsillitis, and augmentin cefotaxime in chronic tonsillitis
Bacteriological Techniques
;
Spectrum Analysis
;
bacteria
7.Effects of recycling on the biomechanical characteristics of retrieved orthodontic miniscrews.
Soon Dong YUN ; Sung Hwan CHOI ; Jung Yul CHA ; Hyung Seog YU ; Kwang Mahn KIM ; Jin KIM ; Chung Ju HWANG
The Korean Journal of Orthodontics 2017;47(4):238-247
OBJECTIVE: The aim of this study was to compare recycled and unused orthodontic miniscrews to determine the feasibility of reuse. The comparisons included both miniscrews with machined surfaces (MS), and those with etched surfaces (ES). METHODS: Retrieved MS and ES were further divided into three subgroups according to the assigned recycling procedure: group A, air-water spray; group B, mechanical cleaning; and group C, mechanical and chemical cleaning. Unused screws were used as controls. Scanning electron microscopy, energy-dispersive X-ray spectrometry, insertion time and maximum insertion torque measurements in artificial bone, and biological responses in the form of periotest values (PTV), bone–implant contact ratio (BIC), and bone volume ratio (BV) were assessed. RESULTS: Morphological changes after recycling mainly occurred at the screw tip, and the cortical bone penetration success rate of recycled screws was lower than that of unused screws. Retrieved ES needed more thorough cleaning than retrieved MS to produce a surface composition similar to that of unused screws. There were no significant differences in PTV or BIC between recycled and unused screws, while the BV of the former was significantly lower than that of the latter (p < 0.05). CONCLUSIONS: These results indicate that reuse of recycled orthodontic miniscrews may not be feasible from the biomechanical aspect.
Microscopy, Electron, Scanning
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Recycling*
;
Spectrum Analysis
;
Torque
8.Nanometrology and its perspectives in environmental research.
Hyun A KIM ; Jung Kwan SEO ; Taksoo KIM ; Byung Tae LEE
Environmental Health and Toxicology 2014;29(1):e2014016-
OBJECTIVES: Rapid increase in engineered nanoparticles (ENPs) in many goods has raised significant concern about their environmental safety. Proper methodologies are therefore needed to conduct toxicity and exposure assessment of nanoparticles in the environment. This study reviews several analytical techniques for nanoparticles and summarizes their principles, advantages and disadvantages, reviews the state of the art, and offers the perspectives of nanometrology in relation to ENP studies. METHODS: Nanometrology is divided into five techniques with regard to the instrumental principle: microscopy, light scattering, spectroscopy, separation, and single particle inductively coupled plasma-mass spectrometry. RESULTS: Each analytical method has its own drawbacks, such as detection limit, ability to quantify or qualify ENPs, and matrix effects. More than two different analytical methods should be used to better characterize ENPs. CONCLUSIONS: In characterizing ENPs, the researchers should understand the nanometrology and its demerits, as well as its merits, to properly interpret their experimental results. Challenges lie in the nanometrology and pretreatment of ENPs from various matrices; in the extraction without dissolution or aggregation, and concentration of ENPs to satisfy the instrumental detection limit.
Limit of Detection
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Microscopy
;
Nanoparticles
;
Spectrum Analysis
9.Biaxial flexural strength and phase transformation of Ce-TZP/Al2O3 and Y-TZP core materials after thermocycling and mechanical loading.
Merve BANKOGLU GUNGOR ; Handan YILMAZ ; Cemal AYDIN ; Secil KARAKOCA NEMLI ; Bilge TURHAN BAL ; Tulay TIRAS
The Journal of Advanced Prosthodontics 2014;6(3):224-232
PURPOSE: The purpose of the present study was to evaluate the effect of thermocycling and mechanical loading on the biaxial flexural strength and the phase transformation of one Ce-TZP/Al2O3 and two Y-TZP core materials. MATERIALS AND METHODS: Thirty disc-shaped specimens were obtained from each material. The specimens were randomly divided into three groups (control, thermocycled, and mechanically loaded). Thermocycling was subjected in distilled water for 10000 cycles. Mechanical loading was subjected with 200 N loads at a frequency of 2 Hz for 100000 times. The mean biaxial flexural strength and phase transformation of the specimens were tested. The Weibull modulus, characteristic strength, 10%, 5% and 1% probabilities of failure were calculated using the biaxial flexural strength data. RESULTS: The characteristic strengths of Ce-TZP/Al2O3 specimens were significantly higher in all groups compared with the other tested materials (P<.001). Statistical results of X-ray diffraction showed that thermocycling and mechanical loading did not affect the monoclinic phase content of the materials. According to Raman spectroscopy results, at the same point and the same material, mechanical loading significantly affected the phase fraction of all materials (P<.05). CONCLUSION: It was concluded that thermocycling and mechanical loading did not show negative effect on the mean biaxial strength of the tested materials.
Spectrum Analysis, Raman
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Water
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X-Ray Diffraction
10.Validation of New Derivatization Procedure for the Determination of Hippuric Acid in Urine Using Gas Chromatography.
Soo Hun CHO ; Yong Hyeon YIM ; Sun Min KIM ; Ho Jang KWON ; Mi na HA ; Sang Hwan HAN
Korean Journal of Occupational and Environmental Medicine 1995;7(1):58-62
Urinary hippuric acid was analyzed by gas chromatography/mass spectrometry method. A simple and economical derivatization procedure using excessive methanol in acidic condition was adopted to esterify hippuric acid. Quantitative analysis was performed with two internal standards, heptadecanoic acid and hydrocinnamic acid, to evaluate the derivatization procedure as an analytical method. Using the standard addition method, linear and reproducible calibration curves were obtained for both internal standards. Calibration experiment showed that good quantitative result could also be obtained with the calibration curve obtained without urine matrix. Recovery rates for the urine samples were in the range of 95.6~111.4%. Using hydrocinnamic acid as internal standard, analysis time could be reduced.
Calibration
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Chromatography, Gas*
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Methanol
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Spectrum Analysis