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- 저자 : Yu Shaopeng (검색결과 3 건)
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Effect of infection by Beauveria bassiana on hemolymph and free amino acid in Xylotrechus rusticus
Ding Junnan,Yu Shaopeng,Wang Hui 한국곤충학회 2021 Entomological Research Vol.51 No.7
The purpose of this study was to clarify changes in the immune response of the hemolymph after infection with Beauveria bassiana in Xylotrechus rusticus larvae in order to reveal the physiological regulating mechanism of the pathogenic fungi. The results showed that B. bassiana was infectious to X. rusticus adults. The main infection sites were the thoracic internodes, lower wings, and abdomen. After infection with B. bassiana, the number of blood cells in the X. rusticus larvae was significantly higher than the control. The number of plasma cells and granulocytes in the hemolymph of the insect was largest. The total number of blood cells was mainly affected by the changes in number of plasma cells and granulocytes. The trehalose content in X. rusticus larvae after B. bassiana treatment continued to decrease compared to the control. The glucose content in the larvae hemolymph increased first, then decreased. The acid trehalase activity was significantly higher than the control, and the high activity was maintained for 60–84 h after infection with B. bassiana. Nineteen kinds of free amino acids were detected in the larvae hemolymph infected by B. bassiana. After infection, the total amount of free amino acids in the larvae hemolymph presented a trend where the amount first declined, then rose. Proline, arginine, and glutamine were the main amino acids required for the growth and development of B. bassiana in X. rusticus larvae. The amount of hemolymph and free amino acids played an important role in immunity during the infection with B. bassiana.
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Synthesis of Au Nanoparticles Functionalized 1D α-MoO3 Nanobelts and Their Gas Sensing Properties
Liwei Wang,Shaopeng Wang,Hao Fu,Yinghui Wang,Kefu Yu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.10
A novel sensor material of Au nanoparticles (NPs) functionalized 1D α-MoO3 nanobelts (NBs) was fabricated by a facile lysine-assisted approach. The obtained Au/α-MoO3 product was characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray (EDX), and X-ray photoelectron spectra (XPS). Then, in order to investigate the gas sensing performances of our samples, a comparative gas sensing study was carried out on both the α-MoO3 NBs before and after Au NPs decoration by using ethanol vapor as the molecular probe. The results turned out that, after the functionalization of Au NPs, the sensor exhibited improved gas-sensing characteristics than the pure α-MoO3, such as response and recovery time, optimal operating temperature (OT) and excellent selectivity. Take for example 200 ppm of ethanol, the response/ recovery times were 34 s/43 s and 5.7 s/10.5 s, respectively, while the optimal operating temperature (OT) was lower to 200 ℃ rather than 250 ℃. Besides, the functionalized sensor showed a higher response to ethanol at 200 ℃, and response was 1.6 times higher than the pure MoO3. The mechanism of such improved sensing properties was interpreted, which might be attributed to the spillover effect of Au NPs and the electronic metal-support interaction.
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Weipeng Sun,Youhong Sun,Yongping Yu,Shaopeng Zheng 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.1
In this paper, an alternative analytical method is presented to evaluate the nonlinear vibration behavior of single and double tapered cantilever beams. The admissible lateral displacement function satisfying the geometric boundary conditions of a single or double tapered cantilever beam is derived by using Rayleigh-Ritz method. Based on the Lagrange method and the Newton Harmonic Balance (NHB) method, analytical approximate solutions in closed and explicit form are obtained. These approximate solutions show excellent agreement with those of numeric method for small as well as large amplitude. Moreover, due to brevity of expressions, the present analytical approximate solutions are convenient to investigate effects of various parameters on the large amplitude vibration response of tapered beams.
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