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Cha, Kyoung Je,Kim, Dong Sung Kluwer Academic Publishers 2011 Biomedical microdevices Vol.13 No.5
<P>In this paper, we propose a novel portable and disposable pressure pump using a porous polydimethylsiloxane (PDMS) sponge and demonstrate its application to a microfluidic lab-on-a-chip. The porous PDMS sponge was simply fabricated by a sugar leaching technique based on capillary suction of pre-cured PDMS into lumps of sugar, thereby enabling us to achieve the porous PDMS sponge composed of interconnected micropores. To indicate the characteristics of the porous PDMS sponge and pump, we measured the average porosities of them whose values were 0.64 and 0.34, respectively. A stress-strain relationship of the fabricated portable pressure pump represented a linear behavior in the compressive strain range of 0 to 20%. Within this range, a pumping volume of the pressure pump could be linearly controlled by the compressed strain. Finally, the fabricated porous PDMS pump was successfully demonstrated as a portable pressure pump for a disposable microfluidic lab-on-a-chip for efficient detection of agglutination. The proposed portable pressure pump can be potentially applicable to various disposable microfluidic lab-on-a-chip systems.</P>
Kyoung-Jun Lee,Honnyong Cha,Jong-Pil Lee,Dong-Wook Yoo,Hee-Je Kim 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.1
This paper introduces a simple core loss calculation method for output filter inductor in pulse width modulation (PWM) DC-AC inverter. Amorphous C-core (AMCC-320) is used to analyze the core loss. In order to measure core loss of the output filter inductor and validate the proposed method, a single-phase half-bridge inverter and a calorimeter are used. By changing switching frequency and modulation index (MI) of the inverter, core loss of the AMCC-320 is measured with the lab-made calorimeter and the results are compared with calculated core loss. The proposed method can be easily extended to other core loss calculation of various converters.
<i>Marinoscillum</i> <i>luteum</i> sp. nov., isolated from marine sediment
Cha, In-Tae,Park, Soo-Je,Kim, So-Jeong,Kim, Jong-Geol,Jung, Man-Young,Shin, Kee-Sun,Kwon, Kae Kyoung,Yang, Sung-Hyun,Seo, Yong-Seok,Rhee, Sung-Keun International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.9
<P>A novel strain, designated SJP7<SUP>T</SUP>, was isolated from sediment of the Tofua Arc of the Tonga Trench. The 16S rRNA gene sequence of the isolate showed the highest similarity to that of <I>Marinoscillum pacificum</I> KCCM 42325<SUP>T</SUP> (95.9 %). Phylogenetic analysis revealed that the isolate formed a distinct phyletic line with <I>Marinoscillum pacificum</I> KCCM 42325<SUP>T</SUP> and <I>Marinoscillum furvescens</I> LMG 13023<SUP>T</SUP> within the family <I>Cytophagaceae</I>. Cells of strain SJP7<SUP>T</SUP> were Gram-stain-negative and appeared as long rods that were motile by gliding. Growth was observed at 15–40 °C (optimum, 30 °C), at pH 5.5–9.0 (optimum, pH 7.5–8.0) and in the presence of 0.5–7.0 % (w/v) NaCl (optimum, 2.5–3 %). The major respiratory quinone was MK-7. The dominant fatty acids were summed feature 3 (comprising C<SUB>16 : 1</SUB>ω7<I>c</I> and/or C<SUB>16 : 1</SUB>ω6<I>c</I>), iso-C<SUB>15 : 0</SUB> and C<SUB>16 : 1</SUB>ω5<I>c</I>. The DNA G<I>+</I>C content was 43.5 mol%. These properties support the affiliation of strain SJP7<SUP>T</SUP> with the genus <I>Marinoscillum</I>. Further phenotypic differentiation of strain SJP7<SUP>T</SUP> from other species of the genus <I>Marinoscillum</I> was indicated by the results of physiological and biochemical tests. On the basis of evidence from our polyphasic taxonomic study, strain SJP7<SUP>T</SUP> represents a novel species of the genus <I>Marinoscillum</I>, for which the name <I>Marinoscillum</I> <I>luteum</I> sp. nov. is proposed. The type strain of <I>Marinoscillum</I> <I>luteum</I> is SJP7<SUP>T</SUP> ( = KCTC 23939<SUP>T</SUP> = NCAIM B02491<SUP>T</SUP>).</P>