Preliminary Report on the Breeding of Robust and Resistant-NPV and High Quality Silkworm Race Shengming No.1 for Summer-autumn Rearing

( Yuan Zhao ),( Ke Pin Chen ),( Qing Yao ),( Yang Chun Wu ),( Jian Zhang ),( Xi Jie Guo ) 한국잠사학회 2006 International Journal of Industrial Entomology Vol.13 No.2

Seveval Chinese and Japanese varieties with good characters were used in the breeding. After 5 years (15 generations), a pair of robust and high quality silkworm variety with NPV resistance was bred by means of a combination of crossing and pedigree selection complemented by the selection of NPV resistance. The variety was identified jointly nationwide in 2003 and 2004, and appraised by National Mulberry and Silkworm Appraising Committee. Results are as follows: its cocooning rate is over 93%, shell rate 23-25%, filament length 1200-1300 meters, reelability 75-88%, Length of non-broken cocoon filament 900-1100 meters, raw silk rate 17-19%, neatness 95-97 points, and cocoon crop, cocoon shell weight and raw silk weight per 10 000 larvae is higher than those of the control variety by 7-10%, 14-19% and 14-18%, respectively. The variety is not only robust, resistant to high temperature and NPV, easy to rear, uniform in hatching, molting and maturing, but also lays more eggs, and its fecundity is high. It is suitable to rear in the Yangtze River Basin, the Yellow River basin and the Pearl River basin of China.

Dynamic control stability analysis of pipeline intelligent plugging robot in its deceleration and precise positioning

Yang Tang,Jie Wu,Xiang Liu,Xin Yang,Yuan Wang,Haoyu Xiong 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9

In order to realize the precise positioning of the tools in the pipeline repair operation, solve the problems of the traditional throttle speed control, such as slow response, long deceleration distance and so on, this paper explores a deceleration process of a pipeline intelligent plugging robot (PIPR) that relies on the friction between slips and the pipe, and establishes its dynamic model based on fuzzy PID force servo control. The influence of PIPR initial velocity, expected deceleration distance, accumulator setting on the response time, positioning accuracy, overshoot and stability during deceleration is analyzed, and the results show that: as the initial velocity increases, the time for slips to contact the pipe decreases, the overshoot of the centroid acceleration gradually increases, the maximum overshoot is -3.4 m/s 2 , the control time of the deceleration process is within 30 s, the positioning accuracy is within 5 %; the expected deceleration distance has a greater impact on the positioning accuracy of the system than the initial velocity; and the accumulator setting has little effect on the positioning accuracy and stability of the system. These studies provide guidance for the design of pipeline robot speed control and positioning system.

Dual-Coupled Inductor High Gain DC/DC Converter with Ripple Absorption Circuit

Yang, Jie,Yu, Dongsheng,Alkahtani, Mohammed,Yuan, Ligen,Zhou, Zhi,Zhu, Hong,Chiemeka, Maxwell The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.6

High-gain DC/DC converters have become one of the key technologies for the grid-connected operation of new energy power generation, and its research provides a significant impetus for the rapid development of new energy power generation. Inspired by the transformer effect and the ripple-suppressed ability of a coupled inductor, a double-coupled inductor high gain DC/DC converter with a ripple absorption circuit is proposed in this paper. By integrating the diode-capacitor voltage multiplying unit into the quadratic Boost converter and assembling the independent inductor into the magnetic core of structure coupled inductors, the adjustable range of the voltage gain can be effectively extended and the limit on duty ratio can be avoided. In addition, the volume of the magnetic element can be reduced. Very small ripples of input current can be obtained by the ripple absorption circuit, which is composed of an auxiliary inductor and a capacitor. The leakage inductance loss can be recovered to the load in a switching period, and the switching-off voltage spikes caused by leakage inductance can be suppressed by absorption in the diode-capacitor voltage multiplying unit. On the basis of the theoretical analysis, the feasibility of the proposed converter is verified by test results obtained by simulations and an experimental prototype.

Research on anti-corrosion graphene coatings with promising properties

Yang Hao-rui,Chen Jie,Zhu Meng-Yuan,Zhang Feng-Jun,Hu Qiang-fei,Oh Won‑Chun 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.6

In order to investigate the effect of graphene content on coating properties, in the research, uniformly dispersed graphene powder was added to the epoxy resin system, preparing graphene coatings with high resistance to corrosion and decay. The diffraction peaks of the coating before and after immersing it in 3.5 wt% NaCl solution and the changes of its microstructure were compared by XRD and SEM, and the results showed the generation of a new composition Zn5(OH)8Cl2·H2O. At the same time, the experiments were carried out to analyze the anti-corrosion performance of the coatings in acid, alkali and salt environments by immersion method and electrochemical AC impedance test, etc. The analysis showed that the graphene coatings with the content of 0.125 wt% showed good anti-corrosion performance in 3.5 wt% NaCl, 2 mol/L HCl and 2 mol/L NaOH. The anti-corrosion properties may be due to the fact that graphene enhanced barrier character of the coating, slowing down the penetration of corrosive media, while the electrical conductivity of graphene is conducive to the zinc-rich coating sacrificial anode to achieve cathodic protection. This research provides a new solution for the production and application of industrialized graphene coatings.

Dual-Coupled Inductor High Gain DC/DC Converter with Ripple Absorption Circuit

Jie Yang,Dongsheng Yu,Mohammed Alkahtani,Ligen Yuan,Zhi Zhou,Hong Zhu,Maxwell Chiemeka 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.6

High-gain DC/DC converters have become one of the key technologies for the grid-connected operation of new energy power generation, and its research provides a significant impetus for the rapid development of new energy power generation. Inspired by the transformer effect and the ripple-suppressed ability of a coupled inductor, a double-coupled inductor high gain DC/DC converter with a ripple absorption circuit is proposed in this paper. By integrating the diode-capacitor voltage multiplying unit into the quadratic Boost converter and assembling the independent inductor into the magnetic core of structure coupled inductors, the adjustable range of the voltage gain can be effectively extended and the limit on duty ratio can be avoided. In addition, the volume of the magnetic element can be reduced. Very small ripples of input current can be obtained by the ripple absorption circuit, which is composed of an auxiliary inductor and a capacitor. The leakage inductance loss can be recovered to the load in a switching period, and the switching-off voltage spikes caused by leakage inductance can be suppressed by absorption in the diode-capacitor voltage multiplying unit. On the basis of the theoretical analysis, the feasibility of the proposed converter is verified by test results obtained by simulations and an experimental prototype.

Keratin/PEO/hydroxyapatite Nanofiber Membrane with Improved Mechanical Property for Potential Burn Dressing Application

Jie Fan,Tong-da Lei,Meng-Yan Yu,Yong-Heng Wang,Fu-Yuan Cao,Qingqi Yang,Faming Tian,Yong Liu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2

Keratin, as a promising substitute for tissue engineering due to its excellent biocompatibility and bioactivity, is used to combine one or more other polymers together. However, compound nanofibers with high keratin content (normally>90 wt.%) may result in the poor elongation of nanofiber membranes such as wound dressing. In this work, different ratios of hydroxyapatites (HA) modified by sodium hexametaphosphate were blended with keratin/polyethylene oxide (PEO) spinning solution to produce reinforced keratin blend nanofiber nonwoven membranes as a potential candidate wound dressing. The tensile strength of keratin blend nanofiber membrane with 15 % modified HA addition was two times higher than that without HA. The morphologies and chemical structure of keratin/PEO/HA nanofiber membranes were investigated using SEM, FTIR, and TG. The biocompatibility and the burn repairing performance of keratin/PEO/HA nanofiber mat were also investigated by cell culture and animal burn model. The results showed that the Keratin/PEO/HA nanofiber membranewas beneficial to enhance the proliferation of L929 cell, exhibiting an advantages in reducing inflammatory response in the infective stage and enhancing skin repairing process in the following recover stages. Our data suggested that keratin/PEO/HA nanofiber membrane could serve as a promising burn dressing for treatment of the skin burn.

Gut Microbiota Alteration Influences Colorectal Cancer Metastasis to the Liver by Remodeling the Liver Immune Microenvironment

Yuan Na,Li Xiaoyan,Wang Meng,Zhang Zhilin,Qiao Lu,Gao Yamei,Xu Xinjian,Zhi Jie,Li Yang,Li Zhongxin,Jia Yitao 거트앤리버 소화기연관학회협의회 2022 Gut and Liver Vol.16 No.4

Background/Aims:This study aimed to explore the effect of gut microbiota-regulated Kupffer cells (KCs) on colorectal cancer (CRC) liver metastasis. Methods: A series of in vivo and in vitro researches were showed to demonstrate the gut microbiota and its possible mechanism in CRC liver metastasis. Results: Fewer liver metastases were identified in the ampicillin-streptomycin-colistin and colistin groups. Increased proportions of Parabacteroides goldsteinii, Bacteroides vulgatus, Bacteroides thetaiotaomicron, and Bacteroides uniformis were observed in the colistin group. The significant expansion of KCs was identified in the ampicillin-streptomycin-colistin and colistin groups. B. vulgatus levels were positively correlated with KC levels. More liver metastases were observed in the vancomycin group. An increased abundance of Parabacteroides distasonis and Proteus mirabilis and an obvious reduction of KCs were noted in the vancomycin group. P. mirabilis levels were negatively related to KC levels. The number of liver metastatic nodules was increased in the P. mirabilis group and decreased in the B. vulgatus group. The number of KCs decreased in the P. mirabilis group and increased in the B. vulgatus group. In vitro, as P. mirabilis or B. vulgatus doses increased, there was an opposite effect on KC proliferation in dose- and time-dependent manners. P. mirabilis induced CT26 cell migration by controlling KC proliferation, whereas B. vulgatus prevented this migration. Conclusions: An increased abundance of P. mirabilis and decreased amount of B. vulgatus play key roles in CRC liver metastasis, which might be related to KC reductions in the liver.

Proceedings of The 2(nd) Asian Society of Veterinary Pathology Symposium and 2005 Annual Meeting of The Korean Society of Veterinary Pathology : Poster Presentation ; HER-2/neu Protein Expression in Canine Mammary Adenocarcinoma

( Hai Jie Yang ),( Sun Hee Do ),( Da Hee Jeong ),( Dong Wei Yuan ),( Il Hwa Hong ),( Myung Hee Sohn ),( Kyu Shik Jeong ) 한국수의병리학회 2005 한국수의병리학회지 Vol.9 No.2

Identification and functional characterization of an antennal glutathione S-transferase in Protegira songi (Lepidoptera Noctuidae)

Zou Jie,Zhang Mengqing,Wen Xi,Zhang Yue,Li Zhi,Yuan Fang,Tang Xiaochao,Xiao Sijie,Shen Tong,Tian Xiangrong,Huang Xinglong,Yang Li 한국응용곤충학회 2025 Journal of Asia-Pacific Entomology Vol.28 No.1

Glutathione S-transferases (GSTs) in insects are essential biotransformation enzymes that play an important role in the degradation of endogenous and exogenous compounds, including xenobiotics, odorant molecules and many other substrates. In this study, nineteen GSTs were identified in Protegira songi, which is a monophagous pest that specifically infests the valuable medicinal and rubber producing plant Eucommia ulmoides. These PsGSTs are members of the cytosolic GST family and contain the N-terminal glutathione (GSH) binding domain and the C-terminal substrate binding domain. Expression analysis revealed that eighteen PsGSTs are expressed in the antennae of both males and females. Among them, PsGSTd2 is a signal peptide containing GST and is primarily expressed in male and female antennae. Phylogenetic analysis showed that PsGSTd2 shares close relationship with olfactory GSTs in other insects. Protein structure analysis showed that the GSH and substrate binding sites in PsGSTd2 form a reaction center in the monomer. In the catalytic assays, recombinant PsGSTd2 exhibited high degradation activity towards 1-chloro-2, 4-dinitrobenzene (CDNB) and the host plant volatile trans-beta-dam ascenone, but no degradation activity towards cis-geraniol and 2-furanmethanol was observed. These results suggest that PsGSTd2 is an extracellular GST primarily expressed in the olfactory tissues and may function as an odorant degrading enzyme by specifically inactivating host plant volatiles.

Rodenticide Poisoning in a Cocker Spaniel Dog

Hai-Jie Yang,Won-Il Jeong,Da-Hee Jeong,Sun-Hee Do,Dong-Hwan Kim,Myung-Hee Sohn,Dong-Wei Yuan,Il-Hwa Hong,Youg-Sook Son,Sang-JoonPark,Tae-Hwan Kim,Kil-Soo Kim,Keun-Woo Lee,Kyu-Shik Jeong 한국실험동물학회 2005 Laboratory Animal Research Vol.21 No.1

A dead Cocker Spaniel, a one-year-old male, was presented from a local animal hospital to the College of Veterinary Medicine, Kyungpook National University with a history of vomiting right after the ingestion of the anti-coagulant rodenticide 14 days before. At necropsy, the thorax was filled with uncoagulated blood and the thymus was markedly hemorrhagic. Hemorrhages were also found in the subcutaneous or mesenteric adipose tissues and the submucosal layers of the intestine and stomach. The spleen was atrophied. In microscopy, hemorrhages were detected in the thymus, submucose of the stomach and intestine, and adipose tissues around several organs such as the heart, kidney, and intestines. However, hemorrhages, were not detected in lungs. Centrilobular necrosis was observed in the liver. In conclusion, the cause of death was severe hemorrhages, which might have been due to the reabsorption of a small amount of anti-coagulant rodenticide that still remained in the body after vomiting. Therefore, the diagnosis was decided as intoxication with anti-coagulant rodenticide.