• Investigative Magnetic Resonance Imaging
• /
• v.12 no.2
• /
• pp.107-114
• /
• 2008

Purpose : The aim of this study is to determine possibility of application of in vivo proton ($^1H$) magnetic resonance spectroscopy (MRS) in distinguishing cystic mass arising around pancreas by comparison of in vivo MRS, in vitro MRS using 3T MR machine, based on nuclear magnetic resonance (NMR). Materials and Methods : We obtained spectra of in vivo MRS, in vitro MRS and NMR from abdominal mass arising around pancreas (mucinous cystic neoplasm=5, intraductal papillary mucin producing tumor=5, pseudocyst=1, and lymphangioma=1). We estimated existence of peak of in vivo MRS, and in vitro MRS concordant to that of NMR. We also evaluated differential peak for predicting specific disease. Results : Correlation of presence of peak with NMR showed showed sensitivity of 29.6%, specificity of 82.6% and accuracy of 67.7% on in vivo MRS (p = 0.096, McNemar test), sensitivity of 57.1% and specificity of 92.6% and accuracy of 82.3% on in vitro MRS (p = 0.362, McNemar test). The spectra of NMR for IPMT showed more frequent peaks at 3.5-4.0 ppm (p=0.026). Conclusion : Although chemical analysis, using NMR could be regarded as possible tool to differentiate cystic masses, in vivo and in vitro MRS need further technical evolution for clinical application.

• Journal of the Korean Chemical Society
• /
• v.23 no.2
• /
• pp.99-103
• /
• 1979

The reductive amination of three ${\alpha}$,${\beta}$-unsaturated aldehydes, cinnamaldehyde, crotonaldehyde, and acrolein are carried out successfully by tetracarbonylhydridoferrate in the presence of various primary amines. In a typical reaction, a mixture of potassium tetracarbonylhydridoferrate (22 mmole), an amine (22∼44 mole) and ${\alpha}$,${\beta}$-unsaturated aldehyde (22 mmole), in ethanol (30∼50 ml) was stirred for 9∼60 hours at room temperature under carbon monoxide atmosphere. All the products were characterized as secondary amines by mass, infrared, and nmr spectra as well as gas chromatographic data.

• Journal of the Korean GEO-environmental Society
• /
• v.7 no.4
• /
• pp.25-34
• /
• 2006

Portland cement and sodium silicate are widely used as the main components of the injection, which are used to prevent flow and improve ground condition. The main problem of the injection material is the leaching of the sodium hydroxite and silicate due to the limited reaction with the cement. This paper studies the effect of cement hydration retarder on the compressive strength of the sodium silicate - cement gel. A series of tests, including digital-type testing machine, X-ray diffraction and scanning electron microscope are performed. Results clearly demonstrate that the sodium tripolyphosphate, which is the cement hydration retarder in the test, significantly improves the initial strength of the homogel.

• Proceedings of the KAIS Fall Conference
• /
• 2012.05a
• /
• pp.235-238
• /
• 2012

본 연구는 Glycine max (L.) Merr.의 태좌부위를 순수 분리하여 callus 세포를 유도하고 2차 대사산물인 isoflavone류에 속하는 daidzein의 생산성을 증진시킬 수 있는 방법을 찾는데 있다. 배양된 callus를 다양한 용매를 사용하여 추출하고, 추출물을 액체 크로마토그래피로 분석해 daidzein 함량의 차이를 확인하였다. 또한 핵자기공명분광법으로 50% 에탄올 추출물 내에 daidzein이 함유되어 있음을 증명하였다.

• Journal of the Korean Magnetics Society
• /
• v.4 no.2
• /
• pp.184-187
• /
• 1994

Nuclear magnetic resonance of $^{133}Cs$ in a $CsMnCl_{3}$ single crystal grown by the Czochralski method has been investigated by employing a Bruker FT NMR spectrometer. The $^{133}Cs$ resonance of two different groups were recorded. Various transitions belonging to two cesium spectra of a different intensity ratio are analyzed. The quadrupole coupling constant of Cs(I) is $0.15{\pm}0.01$ MHz, and that of Cs(II) is $0.21{\pm}0.01$ MHz. The anisotropy parameter is zero for both. The principal axes of the EFG tensors for these two sites are found to be the same. The Z axis, conventionally the largest component of the EFG tensor, is parallel to the crystallographic c-axis.

• Proceedings of the KOSOMBE Conference
• /
• v.1990 no.05
• /
• pp.39-42
• /
• 1990

In recent years, several volume selection techniques have been tried to obtain 31P MR spectroscopy in vivo. Most volume selection techniques, however, suffer from T2 decay in VOI due to the relatively long selection time. In this paper, we propose a new localized 3-D volume selection technique which is specially suitable for 31P spectroscopy. The proposed technique, which uses the radial scans in the k-space, minimizes T2 decay during the selection time and also provides good volume selectivity.

• Journal of the Korean Chemical Society
• /
• v.32 no.6
• /
• pp.536-542
• /
• 1988

A nickel(Ⅱ) complex, Ni(IAA-NBz) (IAA-NBz') with ligand, N-benzylisonitrosoacetyl acetone imine (H-IAA-NBz) has been synthesized. This complex is very stable at room temperature and has cis-form and trans-form isomers. The ratio of nickel (Ⅱ) ion and ligand combined is 1 : 2. The elemental analysis, ir, nmr. electronic spectra and mass spectra have been studied. It is suggested from these studies that the isonitroso group of one ligand, H-IAA-NBz coordinates to nickel(Ⅱ)ion through the nitrogen atom to form five-membered ring, while that of the other ligand, H-IAA-NBz coordinates to nickel (Ⅱ) ion through the oxygen atom to form six-membered ring in square-planar complex.

• Journal of the Korean Applied Science and Technology
• /
• v.12 no.1
• /
• pp.93-99
• /
• 1995

As the surfactants that were used in micellar reaction, emulsion polymerization and phase-transfer reaction etc. have the problems, the cleavable surfactant that was converted to inactive compound after such as the reaction was synthesized to above 90% yield. And this surfactant and intermediates were separated through thin layer chromatography and column chromatatography and their molecular structures were confirmed from IR. $^{1}H$-NMR and elementary analysis spectra. And its surface-active properties and acid hydrolysis will be serialized in II.

• Journal of the Korean Chemical Society
• /
• v.37 no.1
• /
• pp.43-48
• /
• 1993

The $^1H-NMR$ spectra of the NH-group were obtained for N-ethylacetamide (NEAA) in the series of n-alcohols over a temperature range of 310∼350K by using NMR spectroscopy. The $^1H-NMR$ lineshape coupled to $^{14}N$ nucleus were analyzed to obtain the reorientational correlation times ${\tau}_c$ of NEAA. The data indicate that the coupling of solute and solvent decreases as the chain length of n-alcohols increases. But in the n-alcohols the reorientational motion depends almost linearly on η/T of solvents over our temperature range. The results are discussed in the context of the subslip phenomenon.

• Elastomers and Composites
• /
• v.41 no.2
• /
• pp.108-115
• /
• 2006

A series of thermotropic polyurethanes containing biphenyl units was synthesized by polyaddition reaction of diisocyanates such as 2,6-tolylene diisocyanate, 2,5-tolylene diisocyanate, 2,4-tolylene diisocyanate, 1,4-phenylene diisocyanate, and hexamethylene diisocyanate with 4,4'-Bis(9-hydroxynonoxy)biphenyl (BP9). 4,4'-bis(9-hydroxynonoxy)biphenyl exhibited a smectic type mesophase. Mesophase was found for all synthesized liquid crystalline polyurethanes except 1,4-PDI/BP9 based polyurethane. Structures of the monomer and the corresponding polymers were identified using FT-IR and $^1H-NMR$ spectroscopies. Their phase transition temperatures and thermal stability were also investigated by differential scanning calorimetry and optical polarizing microscopy.