• 대한의용생체공학회:의공학회지
• /
• 제8권2호
• /
• pp.145-150
• /
• 1987

Urine NMR analyses made by use of an 80 MHz proton NMR spectrometer show that aromatic proton NMR signals appear in most censer patients'urine. On the assumption that the signals may be caused by the phenolic compound of tyrosine excreted in the urine, a jellied reagent is used for identifying them by observing the urine color reaction. It is observed that the reagent reacted to the cancer urine becomes red. Such a change of the urine color seems to indicate the substance of tyrosine. Recently an attempt to determine the reagent sensitivity an specificity of the urine of 69 persons including cancer and noncancer patients has been made. The results of the attempt are respectively 85.3% for sensitivity and 91.4% for specificity. This seems to show a possibility that the reagent can be used for the diagnosis.

• 한국자기공명학회논문지
• /
• 제3권1호
• /
• pp.52-59
• /
• 1999

Authors synthesized common intermediates which are applicable for potential antibiotics. Their complete 13C and 1H NMR chemical shift data as well as carbon-and proton-fluorine coupling constants are reported. The knowledge of proton and carbon-fluorine coupling constants may help one assign the NMR data of the fluorinated quinolone derivatives. These results agree with the data published previously.

• 한국의학물리학회지:의학물리
• /
• 제3권1호
• /
• pp.3-8
• /
• 1992

개발된 암진단 시약을 사용하는 대신에 대부분의 암뇨에서 관측되는 특성 양성자 핵자기공명 신호의 면적측정에 의한 암진단을 시도하였다. 팔명의 뇨에 대하여 암진단을 시도한 결과, 면적 측정에 의한 암진단은 팔명중 한개의 오진을 얻게 되었으며, 시약에 의한 암진단은 팔명중 네 개의 오진을 얻게 되었음을 보였다.

• 한국자기공명학회논문지
• /
• 제14권2호
• /
• pp.134-143
• /
• 2010

We studied the hydrogen-bonded $TlH_2PO_4$ (TDP) ferroelectrics treated with the proton-beam bombardment. The TDP material was irradiated with 1-MeV proton beam at a dose of $10^{15}/cm^2$. In order to analyze the hydrogen environment in TDP, we carried out the $^1H$ high resolution nuclear magnetic resonance (NMR) - i.e., Combined Rotation And Multiple Pulse Spectroscopy (CRAMPS) measurement. The isotropic chemical shift of hydrogen indicates its displacive property is related to the $PO_4$ lattice deformation which occurs throughout the antiferroelectric-, the ferroelastic- and the paraelastic-phase transitions. The temperature dependence of $\sigma_{iso}$ reveals the electronic charge redistribution is induced by the proton-beam irradiation and the elastic property.

• Bulletin of the Korean Chemical Society
• /
• 제30권11호
• /
• pp.2651-2654
• /
• 2009

In borohydride-protected nanosilvers in laponite sol, the silver particles aggregate to form short chains and a dumbbell shape. The $^{1}H$ NMR measurements in this study represent, to our knowledge, the first observation of proton resonances of borohydride-protected nanosilvers in aqueous solution. Borohydride on nanosilver can be exchanged with 11-mercaptoundecanoic acid (MUA) or trioctylphosphine (TOP). Transmission electron microscopy and UV-Vis spectroscopy data show that the number of aggregated silver nanoparticles decreases upon addition of aforementioned ligands due to the formation of silver MPCs (monolayer-protected clusters). Adsorption of MUA or TOP on nanosilver is confirmed through the observation of broad proton resonances of MPCs in $^{1}H$ NMR spectra.

• 한국농업기계학회:학술대회논문집
• /
• 한국농업기계학회 1996년도 학술발표대회 논문집
• /
• pp.74-79
• /
• 1996

• Bulletin of the Korean Chemical Society
• /
• 제5권2호
• /
• pp.88-89
• /
• 1984

• Bulletin of the Korean Chemical Society
• /
• 제16권12호
• /
• pp.1139-1141
• /
• 1995

• Bulletin of the Korean Chemical Society
• /
• 제17권4호
• /
• pp.308-309
• /
• 1996

• 한국자기공명학회논문지
• /
• 제11권2호
• /
• pp.64-72
• /
• 2007

[ $^1H$ ] nuclear magnetic resonance (NMR) experiments have been performed at 30 - 300 K and 7 T to investigate dynamics of hydrogen bond network in the single crystal $(NH_4)_3H(SO_4)_2$. The two proton sites, ammonium proton and hydrogen-bond proton, are identified from the $^1H$ NMR MAS spectrum at 340 K. As temperature decreases, the $^1H$ NMR spectrum shifts to the higher frequency side with a larger linewidth. The spectrum at 65 K shows a distinctive change in line shape toward the ferroelectric transition at 63 K. The measured values of $T_1$ for ammonium and hydrogen-bond protons are similar in the whole range of temperature. $T_1$ of $^1H$ NMR shows a gradual decrease down to 120 K and starts to steeply increase below 100 K. Then $T_1$ shows abrupt decrease below 70 K with a sharp minimum at 63 K, where the ferroelectric transition occurs. This temperature dependence of spectrum and $T_1$ clearly prove that the large change in the dynamics of hydrogen bond network is associated with the ferroelectric phase transition at 63 K.