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Comparative transcriptome analysis of Cordyceps militaris grown on germinated soybean media
유창혁,최재혁 한국버섯학회 2022 한국버섯학회지 Vol.20 No.1
The ascomycete fungus Cordyceps militaris infects lepidopteran insect pupae, forming characteristic fruiting bodies called “Dong Chung Ha Cho” in Korean. They have been used as medicines owing to their anti-allergic, anti-inflammatory, and immune-enhancing effects. This fungus can be grown on the geminated soybeans Rhynchosia nulubilis, which also contains several novel isoflavones. We performed a comparative transcriptome analysis to determine core gene sets or pathways contributing to biologically active products such as isoflavone. Initially, we sequenced 2-week-old fungal cultures on different soybean agar media, where different amounts of water agar were implemented to show different surface topology. We selected 830 upregulated and 188 downregulated genes by comparing linear models of the samples (two-fold change threshold). Gene ontology analysis identified that the “IMP biosynthesis” term was significantly found in the upregulated gene sets. The pathway is involved in the synthesis of cordycepin, the reference chemical for C. militaris. This finding in the transcriptome data is consistent with the previous observation: increased cordycepin concentrations in the C. militaris cultured on germinated soybean.
Nanoplasmonic Sensor Chip Readable in a Conventional Plate Reader
나희경,유창혁,최준규,옥종걸,정중희,위정섭 한국바이오칩학회 2022 BioChip Journal Vol.16 No.2
In this report, we present a straightforward method for bridging a nanoplasmonic sensor with a conventional plate reader. By attaching lithographically prepared plasmonic nanostructures to a commercially available microwell strip, which has a perforated bottom, we could measure highly sensitive optical signals of plasmonic nanostructures using a conventional plate reader. The absorbance measurements and electromagnetic simulations show that a proper alignment between light polarization and the plasmonic nanostructure improves the sensing performance, which can be achieved with a linear polarizing film. Furthermore, the multiplexed detection capability of the proposed nanoplasmonic sensor chip was successfully demonstrated by monitoring four different enzyme–substrate reactions. These results illustrate the potential of the proposed nanoplasmonic sensor chip, which can combine advanced nanoplasmonic sensors with the well-developed microwell plate reader.
An experimental study on fatigue performance of cryogenic metallic materials for IMO type B tank
이진성,유원효,유창혁,김경수,김유일 대한조선학회 2013 International Journal of Naval Architecture and Oc Vol.5 No.4
Three materials SUS304, 9% Ni steel and Al 5083-O alloy, which are considered possible candidate for International Maritime Organization (IMO) type B Cargo Containment System, were studied. Monotonic tensile, fatigue,fatigue crack growth rate and Crack Tip Opening Displacement tests were carried out at room, intermediate low (-100oC) and cryogenic (-163 oC) temperatures. The initial yield and tensile strengths of all materials tended to increase with decreasing temperature, whereas the change in elastic modulus was not as remarkable. The largest and smallest improvement ratio of the initial yield strengths due to a temperature reduction were observed in the SUS304 and Al 5083-O alloy, respectively. The fatigue strengths of the three materials increased with decreasing temperature. The largest increase in fatigue strength was observed in the Al 5083-O alloy, whereas the 9% Ni steel sample showed the smallest increase. In the fatigue crack growth rate test, SUS304 and Al 5083-O alloy showed a decrease in the crack propagation rate, due to decrease in temperature, but no visible improvement in da/dN was observed in the case of 9% Ni steel. In the Crack Tip Opening Displacement (CTOD) test, CTOD values were converted to critical crack length for the comparison with different thickness specimens. The critical crack length tended to decrease in the case of SUS304 and increase for the Al 5083-O alloy with decreasing temperature. In case of 9% Ni steel, change of critical crack length was not observed due to temperature decrease. In addition, the changing material properties according to the temperature of the LNG tank were analyzed according to the international code for the construction and equipment of ships carrying liquefied gases in bulk (IGC code) and the rules of classifications.
변동하중하의 잔류응력을 고려한 십자형 용접부의 잔존 수명 예측에 관한 연구
김성훈,김경수,이장현,유창혁,유원효,유미지,Kim, Sung-Hoon,Kim, Kyung-Su,Lee, Jang-Hyun,Yoo, Chang-Hyuk,You, Won-Hyo,Yoo, Mi-Ji 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.2
This paper deals with the crack propagation life assessment of T-joint welded structure where typical fatigue cracks have been frequently initiated when the marine vessels experience the storm load. Welding residual stresses are calculated to investigate its effects on the fatigue life. Thereafter the residual stress distribution was applied to the AFGROW life prediction program, which incorporated the loading, the welding residual stress, and the geometric shape of the structure. The fatigue tests of the T-joint welded specimen under storm loading show the beach mark clearly generated on the fractured section of the weldment. The crack propagation life estimated based on the beach mark is compared with that of AFGROW to validate the life prediction. Based on the results, the evaluation method of the remaining fatigue life for T-joint fillet weldment of marine vessel's cargo hold with random load or storm load was established.
이성준(Sungjun Lee),유창혁(Chang-Hyuk Yoo),이정훈(Junghoon Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
We report a highly selective and sensitive explosive sensor system based on a biological receptor. The sensor system employs a quartz crystal microbalance (QCM) whose sensing surface is functionalized with an anti-explosive oligo-peptide receptor. While other approaches with synthetic materials such as 4-mercapto phenol and Carbowax® has concerns over specificity because of additional interactions with polarized molecules including water and alcohols, the response of our biological receptor is highly selective to dinitrotoluene (DNT) which is an explosive marker molecule. We demonstrate that the sensor does not respond to other explosive analogues and polar molecules such as toluene, methanol, and ethanol. The oligopeptide receptor shows the sensitivity down to 1.8 ppm against the DNT. Our sensor system can be used for the direct detection of antipersonnel plastic mines for which the conventional approaches such as metal detector and ground penetrating radar (GPR) have difficulties.