1,758 research outputs found
Arachidicoccus soli sp. nov., a bacterium isolated from soil
No full textLee, Shin Ae, Kim, Tae-Wan, Sang, Mee-Kyung, Song, Jaekyeong, Kwon, Soon-Wo, Weon, Hang-Yeon (2021): Arachidicoccus soli sp. nov., a bacterium isolated from soil. International Journal of Systematic and Evolutionary Microbiology (004566) 71 (1): 1-6, DOI: 10.1099/ijsem.0.004566, URL: http://dx.doi.org/10.1099/ijsem.0.00456
Development of Super Insulator with Staggered Beam
No full textThe thermal conductivity of a vacuum insulation panels(VIPs) is investigated theoretically for the development of super insulator. A staggered beam model, a design subject to the atmospheric pressure, is suggested. To design core structure, analyses of strength and heat conduction are performed. Deflection effect by the atmospheric pressure is also considered. Finally, the effective thermal conductivities are calculated for various materials. The insulation performance of the proposed model can be enhanced by taking materials of greater figure of merit,σ /k. In addition, core structure on which the maximum stress is uniformly distributed is the most desirable
Electrical properties of CuInSe2-films prepared by evaporation of Cu2Se and In2Se3 compounds
No full textWe prepared CuInSe2 films by evaporating In2Se3 and Cu2Se compounds instead of elemental sources, The resulting CuInSe2 film grown at 680 degrees C had a smooth and dense microstructure with the grain size of 2 similar to 3 mu m. But the CuInSe2 films were Cu-rich, with a low resistivity of about 0.1 Omega cm. So we conducted H-2 post annealing to control the electrical resistivity and composition of CuInSe2 films. In a H-2 atmosphere, the resistivity increased to about 100 Omega cm by annealing at 350 degrees C for 1 h. The resistivity decreased again when the annealing temperature was above 350 degrees C, This resistivity change might be related to the contents of Cu, In, Se atoms and the valency states of Cu and In ions in the films. We discussed the reason of resistivity change caused by H-2 post annealing in this paper
Two-dimensional offsets and medial axis transform
No full textChoi, Hyeong In; Choi, Sung Woo; Han, Chang Yong; Kim, Tae-wan; Kwon, Song-Hwa; Moon, Hwan Pyo; Roh, Kyeong Hah; Wee, Nam-Sook. (2006). Two-dimensional offsets and medial axis transform. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/4313
Arachidicoccus soli Lee & Kim & Sang & Song & Kwon & Weon 2021, SP. NOV.
No full textDESCRIPTION OF ARACHIDICOCCUS SOLISP. NOV. Arachidicoccus soli (so′ li. L. gen. n. soli of soil). Cells are aerobic, Gram-stain-negative, non-motile and rod-shaped (0.5–0.6 µm wide and 1.3–10 µm long). Colonies grown at 28 °C on R2A agar for 2 days are light yellow, round and convex. Growth occurs at 10–33 °C, pH 6.0–7.5 and with 0–4 % NaCl (w/v). Tests for catalase and oxidase are negative. Tyrosine is hydrolysed, but casein, CM-cellulose, hypozanthine, DNA and Tween 80 are not. Positive for aesculin hydrolysis and β -galactosidase, but negative for nitrate reduction, indole production, glucose fermentation, arginine dihydrolase, urease and gelatin hydrolysis. Assimilates D-glucose, L-arabinose, D-mannose, N -acetylglucosamine, maltose, L-rhamnose and L-proline, but does not assimilate D-mannitol, potassium gluconate, capric acid, adipic acid, malic acid, trisodium citrate, phenylacetic acid, D-ribose, inositol, sucrose, itaconic acid, suberic acid, sodium malonate, sodium acetate, lactic acid, L-alanine, potassium 5-ketogluconate, glycogen, 3-hydroxybenzoic acid, L-serine, salicin, melibiose, L-fucose,D-sorbitol, propionic acid, valeric acid, L-histidine, potassium 2-ketogluconate, 3-hydroxybutyric acid and 4-hydroxybenzoic acid. Positive activities for alkaline phosphatase, esterase (C4), leucine arylamidase, valine arylamidase, cystine arylamidase, acid phosphatase, naphthol-AS-BI-phosphohydrolase, α-galactosidase, β -glucuronidase, α-glucosidase, N - acetylβ -glucosaminidase and α-fucosidase, but negative activities for esterase lipase (C8), lipase (C14), trypsin, α-chymotrypsin, β -glucosidase and α-mannosidase. The major respiratory quinone is MK-7. Polar lipids consist of phosphatidylethanolamine, four unknown aminolipids and three unknown lipids. The major fatty acids are iso-C 15:0, iso-C 17:0 3-OH and iso-C 15:1 G. The major polyamines were homospermidine and putrescine. The genomic DNA G+C content of the type strain is 36.4mol%. Data was taken from a, Madhaiyan et al. [1], b, Siddiqi et al. [2], and c, Siddiqi et al. [3]. *Summed features are groups of two or three fatty acids that cannot be separated by the MIDI system. Summed feature 2 comprised C12:0 aldehyde and/or unknown equivalent chain length (ECL) 10.928 and/or C14:0 3-OH and/or iso-C16:1 I. Summed feature 3 comprised C16:1 ω 6 c and/or C16:1 ω 7 c. The type strain, KIS59-12 T (= KACC 17340 T = NBRC 113161 T), was isolated from a soil sample collected on Hodo island, Boryeong, Chungcheongnam-do Province, Republic of Korea. The GenBank / EMBL / DDBJ accession numbers for the 16S rRNA gene sequence and the genome sequence of strain KIS59-12 T are MH 933978 and CP032489, respectively.Published as part of Lee, Shin Ae, Kim, Tae-Wan, Sang, Mee-Kyung, Song, Jaekyeong, Kwon, Soon-Wo & Weon, Hang-Yeon, 2021, Arachidicoccus soli sp. nov., a bacterium isolated from soil, pp. 1-6 in International Journal of Systematic and Evolutionary Microbiology (004566) (004566) 71 (1) on pages 4-5, DOI: 10.1099/ijsem.0.004566, http://zenodo.org/record/604870
Morphology Tunable Hybrid Carbon Nanosheets with Solvatochromism
No full textThe tunable photoluminescence of carbon-based nanomaterials has received much attention for a wide range of applications. Herein, a unique, broad-solvatochromic hybrid carbon nanosheet (CNS) synthesized through the hydrothermal carbonization of molecular precursors exploiting graphene oxide as a template is reported, resulting in the formation of clusters of carbon nanorings on the surface of graphene-oxide nanosheets. Under UV and visible-light excitation, the hybrid CNS exhibits tunable emission spanning the wide range of colors in a series of solvents with different polarities. This interesting spectroscopic behavior is found to originate from hydrogen-bonding interactions between CNS and solvents, which eventually induce the morphological transition of CNS from 2D sheets to 3D crumpled morphologies, affecting the lifetimes of emissive states. This novel soft carbon nanostructure may open up a new possibility in tailoring the photophysical properties of carbon nanomaterials
Vacuum maintenance in vacuum insulation panels exemplified with a staggered beam VIP
No full textThermal insulation performance of a vacuum insulation panel (VIP) is highly dependent on the inner pressure of the VIP. Long-term vacuum maintenance characteristics are investigated in this study for a VIP with an example of polymer staggered beam structure as the core material. Various gas sources deteriorating the vacuum level in the VIP are investigated based on theoretical models and experiments. Gas permeation occurring through heat-sealed flanges and pinholes in the barrier envelope is the largest gas leakage source. The calculated gas permeation rate is in accordance with the experimental result. To reduce these permeations, a three-side sealing envelope and double enveloping are proposed. Outgassing from the core material and inner surface of the envelope is also critical. It is significantly reduced by a baking pre-treatment in vacuum. When the estimated total gas load exceeds the allowable limit within a few years, a getter material may be applied. Double enveloping structure with a getter is promising as it ensures a lifetime of more than 20 years. (C) 2009 Elsevier B.V. All rights reserved.The authors gratefully acknowledge the financial support of several projects: Energy, Environment, Water, and Sustainability (EEWS) program funded by the Korea Advanced Institute of Science and Technology (KAIST), the Brain Korea 21 (BK21) program funded by Ministry of Education, Science and Technology (MEST) and the Manpower Development Program for Energy & Resources funded by the Ministry of Knowledge and Economy (MKE)
F-18 flluorodeoxyglucose positron emission tomography and computed tomography is not accurate in preoperative staging of gastric cancer
No full textPurpose: To investigate the clinical benefits of F18-fluorodeoxyglucose-positron emission tomography and computed tomography (18F-FDG-PET/CT) over multi-detector row CT (MDCT) in preoperative staging of gastric cancer. Methods: FDG-PET/CT and MDCT were performed on 78 patients with gastric cancer pathologically diagnosed by endoscopy. The accuracy of radiologic staging retrospectively was compared to pathologic result after curative resection. Results: Primary tumors were detected in 51 (65.4%) patients with 18F-FDG-PET/CT, and 47 (60.3%) patients with MDCT. Regarding detection of lymph node metastasis, the sensitivity of FDG-PET/CT was 51.5% with an accuracy of 71.8%, whereas those of MDCT were 69.7% and 69.2%, respectively. The sensitivity of 18F-FDG-PET/CT for a primary tumor with signet ring cell carcinoma was lower than that of 18F-FDG-PET/CT for a primary tumor with non-signet ring cell carcinoma (35.3% vs. 73.8%, P ��� 0.01). Conclusion: Due to its low sensitivity, 18F-FDG-PET/CT alone shows no definite clinical benefit for prediction of lymph node metastasis in preoperative staging of gastric cancer.Due to its low sensitivity, 18F-FDG-PET/CT alone shows no definite clinical benefit for prediction of lymph node metastasis in preoperative staging of gastric cancer
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