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Acid treatment enhances performance of beads activated carbon for formaldehyde removal
Kang Yu-Jin,Jo Hyung-Kun,Jang Min-Hyeok,Han Gyoung-Jae,Yoon Seong-Jin,Oh Kyeongseok,Park Joo-Il 한국탄소학회 2023 Carbon Letters Vol.33 No.2
This study evaluated how acid treatment affects the ability of customized beads of activated carbon (BAC) to remove formaldehyde from air. Two different acids (hydrofluoric acid and sulfuric acid) were used to modify the surface of BAC prepared from a polymer material. The acid-modified BACs were further subjected to heat treatment. Physical and chemical characteristics of modified and unmodified BACs were investigated using nitrogen adsorption, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray fluorescence, and X-ray photoelectron spectroscopy. Formaldehyde removal was evaluated under both dry and moist conditions. From the results, acid treatment clearly improved the adsorption performance, especially under the moist condition. Qualitative and quantitative surface analyses were conducted, mainly to examine the amount of O-bonds after acid treatment and the formation of S–O or Cl–O on BAC.
Expression of human norovirus VP1 gene and VP1-specific monoclonal antibodies
Jin-Won Kim,Yun-Ju Kong,Myeong-Seob Kim,Hyeok-Jin Lee,Shien-Young Kang,Sang-Won Lee 충북대학교 동물의학연구소 2015 Journal of Biomedical and Translational Research Vol.16 No.3
Norovirus (NoV) is an etiologic agent of human and animal acute gastroenteritis and is a member of the family Caliciviridae. NoV is classified based on nucleotide sequences of the VP1 gene into at least six genogroups (GI-GVI), among which GI, GII, and GIV are known to infect humans and GII is the most prevalent genogroup. In this study, VP1, the full gene of GII human NoV, was cloned from a human fecal sample and expressed using a baculovirus expression system. Human NoV VP1-specific monoclonal antibodies (MAbs) were produced using expressed recombinant VP1. Expressed VP1 in the recombinant virus was confirmed by polymerase chain reaction (PCR), indirect fluorescence antibody (IFA) test, and Western blot analysis. Eight hybridomas secreting VP1-specific MAbs against human GII NoV were generated and characterized. All of the MAbs produced in this study reacted with human GII NoV VP1-recombinant baculoviruses but not with other non-human calicivirus recombinant baculoviruses. These MAbs reacted specifically with human NoV GII.4-2009 virus-like particles (VLPs), and some MAbs showed cross-reactivity with other GII.4 variant VLPs. Expressed human GII NoV VP1-recombinant protein and MAbs specific to this protein can be used as useful reagents for detecting and characterizing human NoV.
Kang, Hyoung Jin,Lee, Ji Won,Kho, Sang Hyeok,Kim, Min Jeong,Seo, Young Jin,Kim, Hyery,Shin, Hee Young,Ahn, Hyo Seop The Korean Academy of Medical Sciences 2010 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.25 No.6
<P>Identification of prognostic factors and risk-based post-remission therapy was proposed to improve the outcomes of acute myeloid leukemia (AML) and a mutation of FLT3 has been reported to be a risk factor, especially for pediatric patients. Recently, FLT3 expression level was implicated to have prognostic significance in adults, but little is known for childhood AML. To define the prognostic significance, transcript level of FLT3 was analyzed in 52 pediatric AML patients. The median copy number of FLT3 was 4.6×10<SUP>3</SUP> (40-5.9×10<SUP>7</SUP> copies)/1.0×10<SUP>6</SUP> GAPDH copy, and the relapse free survival of patients with high transcript level of FLT3 (>10<SUP>6</SUP> copy number) (0%) was significantly lower than that of the others (53.2%). High transcript level of FLT3 was associated with a markedly high risk of relapse. The development of new therapeutic scheme such as a frontline allogeneic stem cell transplantation or administration of FLT3 inhibitor is needed to improve outcomes.</P>
Multi-Wavelength Emitting InGaN/GaN Quantum Well Grown on V-Shaped GaN(1101) Microfacet
Kang, Eun-Sil,Ju, Jin-Woo,Kim, Jin Soo,Ahn, Haeng-Keun,Lee, June Key,Kim, Jin Hyeok,Shin, Dong-Chan,Lee, In-Hwan American Scientific Publishers 2007 Journal of Nanoscience and Nanotechnology Vol.7 No.11
<P>InGaN/GaN multiple quantum wells (MQWs) were successfully grown on the inclined GaN(1101) microfacets. Conventional photolithography and subsequent growth of GaN were employed to generate the V-shaped microfacets along 〈1120〉 direction. The well-developed microfacets observed by scanning electron microscopy and the clear transmission electron microscope interfacial images indicated that the MQW was successfully grown on the GaN microfacets. Interestingly, cathodoluminescence (CL) spectra measured on the microfacets showed a continuous change in the luminescence peak positions. The CL peaks were shifted to a longer wavelength from 420 nm to 440 nm as the probing points were changed along upward direction. This could be attributed to the non-uniform distribution of the In composition and/or the wavefunction overlapping between adjacent wells. Present works thus propose a novel route to fabricate a monolithic white light emitting diode without phosphors by growing the InGaN/GaN MQWs on (1101) facet.</P>