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Kamruzzaman, Mohammad,Alam, Al-Mahmnur,Kim, Kyung Min,Lee, Sang Hak,Kim, Young Ho,Kabir, A N M Hamidul,Kim, Gyu-Man,Dang, Trung Dung Kluwer Academic Publishers 2013 Biomedical microdevices Vol.15 No.1
<P>A rapid and sensitive chemiluminescence (CL) system coupled with a microfluidic chip has been presented to determine vitamin B12 (VB12) based on the reaction of luminol and silver nitrate (AgNO(3)) in the presence of gold nanoparticles (AuNPs). A microfluidic chip was fabricated by a soft-lithographic procedure using polydimethyl siloxane (PDMS) having four inlets and one outlet with a 200?μm wide, 250?μm deep, and 100?mm long microchannel. Ag(+) was used as a chemiluminogenic oxidant in this CL reaction which oxidized luminol to produce strong CL signal in the presence of AuNPs. Luminol reacted with AgNO(3) under the catalysis of AuNPs to produce luminol radicals which reacted with dissolved oxygen and emitted CL light. The proposed CL system was applied to determine the amount of VB12 in VB12 tablets and multivitamin. Under the optimum conditions, the CL intensity of the system was increased with the concentration of VB12 in the range of 0.25-100?ng mL(-1) with the correlation coefficient of 0.9982. The limit of detection was found to be 0.04?ng mL(-1) with the relative standard deviation of 1.56?% for five replicate determinations of 25?ng mL(-1) of VB12. The CL reaction mechanism was demonstrated by UV-visible spectra and CL emission spectra.</P>
Kamruzzaman, Mohammad,Ferdous, Taslima,Alam, Al-Mahmnur,Lee, Sang-Hak,Kim, So-Yeun,Kim, Young-Ho,Kim, Sung-Hong Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
A simple and highly sensitive chemiluminescence method to determine norfloxacin (NFLX) has been proposed by measuring the chemiluminescence (CL) intensities using a flow injection (FI) system. The CL intensity of the luminol-$H_2O_2$ system is strongly enhanced by the addition of Cu (II) in alkaline condition. The CL intensity is substantially increased after the injection of NFLX into the luminol-$H_2O_2$-Cu (II) system. The enhancement effect is attributed to a catalytic effect of Cu (II) due to the interaction with NFLX which forms a complex with the catalyst. Under the optimal conditions, the sensitizing effect of the CL intensity is proportional to the concentration of NFLX in the range of $1.5{\times}10^{-9}-5.9{\times}10^{-7}molL^{-1}$ (r = 0.9994) with a detection limit ($3{\sigma}$) of $2.98{\times}10^{-10}molL^{-1}$. The proposed method had good reproducibility with the relative standard deviation (RSD, n = 5) of 1.6% for $1{\times}10^{-7}molL^{-1}$ of NFLX. The possible reaction mechanism of the CL reaction is also discussed. This method has been successfully applied for the determination of trace amount of NFLX in pharmaceutical preparations and serum samples.
Kamruzzaman, M.,조재필,장민원,황세운 한국농공학회 2019 한국농공학회논문집 Vol.61 No.1
A good number of drought indices have been introduced and applied in different regions for monitoring drought conditions, but some of those areregion-specific and have limitations for use under other climatic conditions because of the inherently complex characteristics of drought phenomenon. Standardized Precipitation Index (SPI) indices are widely used all over the world, including Bangladesh. Although newly developed, studies havedemonstrated The Effective Drought Index (EDI) to perform better compared to SPIs in some areas. This research examined the performance of EDIto the SPI for detecting drought events throughout 35 years (1981 to 2015) in Bangladesh. Rainfall data from 27 meteorological stations acrossBangladesh were used to calculate the EDI and SPI values. Results suggest that the EDI can detect historical records of actual events better than SPIs. Moreover, EDI is more efficient in assessing both short and long-term droughts than SPIs. Results also indicate that SPI3 and the EDI indices havea better capability of detecting drought events in Bangladesh compared to other SPIs; however, SPI1 produced erroneous estimates. Therefore, EDI isfound to be more responsive to drought conditions and can capture the real essence of the drought situation in Bangladesh. Outcomes from this studybear policy implications on mitigation measures to minimize the loss of agricultural production in drought-prone areas. Information on severity leveland persistence of drought conditions will be instrumental for resource managers to allocate scarce resources optimally.