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Synthesis and Biological Activities of Novel Methyl Xanthine Derivatives

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Chemical Research in Chinese Universities 2014年第1期30卷 98-102页

作者： CHEN Youwei WANG Baolei GUO Yanjun ZHOU Yunyun pan li XIONG lixia YU Shujing li Zhengming State Key Laboratory of Elemento-organic Chemistry Research Institute of Elemento-organic Chemistry Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Nankai University Tianjin 300071 P. R. China

Caffeine is one of methyl xanthine compounds,which has the similar mode of action as ryanodine receptor *** order to find novel and efficient insecticide,structural modification of certain methyl xanthine compounds was made by introducing some common pesticidal active moieties into the structure of *** novel methyl xanthine compounds were synthesized and characterized by 1H nuclear magnetic resonance（1H NMR）,elemental analylsis or high-resolution mass spectrometry（HRMS）.According to the biological activity results,it was found that these new compounds show moderate activity towards Mythimna separata Walker and Culex pipiens *** example,compound 2d shows a lethality rate of 40％ at 200 mg/L towards Mythimna separata Walker,compounds 2i and 2f show 56.7％ and 53.3％ lethality rates at 2 mg/L towards Culex pipiens pallens,which are all better than *** addition,some compounds of them show moderate antifungal activity to some plant pathogenous fungi.

关键词： Caffeine Xanthine Insecticidal activity Antifungal activity

Mitochondrial and nuclear damages and caspase-3 expression in the hippicampal CA3 region of rats with kainic acid induced statuse pilepticus

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Neural Regeneration Research 2006年第7期1卷 577-580页

作者： Shuhai Tang Jianying Sun Xiaojun pan li Zhang Department of Anesthesiology Qilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina Department of NeurologyQilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina Department of AnesthesiologyQilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina Department of AnesthesiologyQilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina

BACKGROUND: Some scholars believed that the neuronal injury after status epilepticus is apoptosis, the main evidence is the changes of expressions of various apoptosis related genes, such as immediate-early gene, p53 gene and genes of bcl-2 family, etc. But there is still no ultrastructural evidence for apoptosis. OBJECTIVE: To observe the ultrastructural damages of mitochondrion and nucleus and the changes of caspase expression in neurons of hippocampal CA3 region in rats with status epilepticus induced by kainic acid. DESIGN: A randomized controlled study. SETTING: Department of Anesthesiology and Department of Neurology, Qilu Hospital of Shandong University. MATERIALS: Seventy-five adult male Wistar rats of 250-300 g, clean degree, were provided by the experimental animal center of Shandong University. Kainic acid was purchased from Sigma Company (USA); rabbit anti-rat polyclonal antibody caspase-3 from Santa Cruz Company (USA). METHODS: The experiments were carried out in the Department of Anesthesiology, Qilu Hospital of Shandong University from October 2005 to February 2006. ① The 75 rats were randomly divided into experimental group (n =45) and control group (n =30). ② Model establishment, convulsion grading and the judging standards for status epilepticus: Rats in the experimental group were given intraperitoneal injection of kainic acid (10 mg/kg), and those in the control group were injected with saline of the same volume. The time of seizure was recorded and their behavioral manifestations were observed, and the seizure was terminated by intraperitoneal injection of diazepam (10 mg/kg). ③ Observation under electron microscope: At 3, 12 and 24 hours after status epilepticus respectively, bilateral hippocampal tissues were taken out, semithin sections of about 75 nm were prepared after fixation, dehydration and embedding, and then observed under H-800 transmission electron microscope. ④ Immunohistochemical detection: Bilateral hippocampi were removed at 3,

关键词： acid Mitochondrial and nuclear damages and caspase-3 expression in the hippicampal CA3 region of rats with kainic acid induced statuse pilepticus CA

Calculation of Apparent Activation Energy of Coal Oxidation at Low Temperatures by Measuring CO Yield

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Journal of China University of Mining and Technology 2006年第1期16卷 37-41页

作者： QI Feng li Zeng-hua pan Shang-kun ZHANG lin School of Mining and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

By analyzing previous studies on activation energy of coal oxidation at low temperatures, a theoretical calculation model of apparent activation energy is established. Yield of CO is measured by using the characteristic detector of coal oxidation at 30-90 ℃. The impact of parameters, such as airflow and particle size, on activation energies is analyzed. Finally, agreement was obtained between activation energies and the dynamic oxygen absorbed in order to test the accuracy of the model. The results show that： 1） a positive exponential relation between concentration of CO and temperature in the process of the experiment is obtained： increases are almost identical and the initial CO is low; 2） the apparent activation energies increase gradually with the sizes of particle at the same airflow, but the gradients increase at a decreasing rate; 3） the apparent activation energies increase linearly with airflow. For the five coal particles, the differences among the energies are relatively high when the airflow was low, but the differences were low when the airflow was high; 4） the optimum sizes of particle, 0.125-0.25 ram, and the optimum volume of airflow, 100 mL/min, are determined from the model; 5） the apparent activation energies decrease with an increase in oxygen absorbed. A negative exponential relation between the two is obtained,

关键词： coal oxidation at low temperature apparent activation energy particle size airflow

Imaging presentation and postoperative recurrence of peliosis hepatis: A case report

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World Journal of Clinical Cases 2021年第19期9卷 5197-5202页

作者： Si-Xie Ren pan-pan li Hai-Peng Shi Jun-Hui Chen Zhen-Ping Deng Xi-E Zhang Department of Radiology Chengdu Second People’s HospitalChengdu 610000Sichuan ProvinceChina Pathology Center Chengdu Second People’s HospitalChengdu 610000Sichuan ProvinceChina

BACKGROUND Peliosis hepatis(PH)is a rare benign lesion of vascular origin with a pathological characteristic of multiple blood-filled cavities in the liver *** is commonly misdiagnosed due to its lack of specificity in clinical presentation and laboratory test ***,a case of a patient with PH who was misdiagnosed with hepatic echinococcosis before operation to remove the lesions was analyzed,with an emphasis on the computed tomography and magnetic resonance imaging characteristics of *** SUMMARY We outline the case of a 40-year-old Chinese female who was admitted with aggravated abdominal pain with fever for 1 *** examination at the local hospital indicated hepatic ***,discordance between imaging diagnosis,clinical history and laboratory examinations in our ***,the patient was pathologically confirmed as having PH-like changes,which recurred 1 year after operation removal of the *** Our objective is to highlight the imaging diagnostic value of PH.

关键词： Peliosis hepatis Computer tomography Magnetic resonance imaging Recurrence Misdiagnosis Case report

Modeling decarburization kinetics of grain-oriented silicon steel

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Chinese Science Bulletin 2014年第15期59卷 1778-1783页

作者： Hai-Wen Luo Rui Xiang ling-Feng Chen li-Mei pan Research Center of Electrical Steels Central Iron & Steel Research Institute School of Materials Engineering and Science University of Science and Technology Beijing Department of Silicon Steels Qian’an Iron & Steel Corp. ShouGang Group

A mathematic model has been presented to predict the decarburization kinetics of grain-oriented silicon steel sheet in the gas mixture of N2–H2–H2O during *** model is based on the carbon flux balance between the oxidation reaction at the surface and the carbon diffusion inside the steel *** can be numerically solved to quantify the influences of annealing temperature and atmosphere on decarburization kinetics when the boundary conditions are properly *** case that a humid gas mixture is employed during annealing,the most influential process parameter is temperature rather than compositions of the gas mixture,because the diffusion of carbon in ferrite is the rate-limiting ***,a higher temperature is required for the efficient decarburization of the thicker silicon steel sheet using the industrial continuous annealing production line.

关键词：取向硅钢晶粒取向动力学脱碳连续退火生产线气体混合物建模退火温度

Spectral Characteristics of liSrBO_3:Tb^(3+) Green Phosphor

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Chemical Research in Chinese Universities 2009年第5期25卷 610-613页

作者： li pan-lai WANG Zhi-jun YANG Zhi-ping GUO Qing-lin College of Physics Science ＆ Technology Hebei University Baoding 071002 P. R. China

liSrBO3：Tb^3＋ green phosphor was synthesized by means of a solid state reaction and its spectral characteristics were studied. The emission spectrum of liSrBO3：Tb^3＋ consists of four major bands at 486, 544, 595 and 620 nm under the excitation of near ultraviolet irradiation, which are originated from the ^5Da→^7F6, ^5D4→^7F5, ^5D4→^7F4 and ^5D4→^7F3 characteristic transitions of Tb^3＋, respectively. Monitored at 544 nm, the excitation spectrum of the phosphor extends from 220 nm to 390 nm, with the excitation peaks centered at 242, 277, 368 and 381 nm, respectively. The effect of Tb^3＋ concentration on the emission intensity of liSrBO3：Tb^3＋ was also investigated. The results show that firstly the intensity increases with increasing Tb^3＋ concentration, reaches a maximum value at 3%（molar fraction） Tb^3＋ and then decreases, showing a concentration self-quenching, whose mechanism is proposed as a d-d interaction based on Dexter theory. The emission intensity of liSrBO3：Tb^3＋ was enhanced by co-doping li^＋, Na^＋ and K^＋.

关键词： liSrBO3:Tb^3+ Green phosphor Spectral characteristics

Relationship between dietary amino acid release kinetics and nitrogen deposition in growing pigs

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Animal Nutrition 2022年第2期9卷 233-239页

作者： Qiyu Zhang Bin Wang Nianzhi Hu Nan Bao li pan Yuan Zhao Guixin Qin Key Laboratory of Animal Production Product Quality and SecurityMinistry of EducationJilin Provincial Key Laboratory of Animal Nutrition and Feed ScienceCollege of Animal Science and TechnologyJilin Agricultural UniversityChangchun130118China

Although the protein content of swine diets is formulated based on the ileal digestibility of protein and amino acids(AA)under current nutrition requirements,the nitrogen utilization efficiency of swine varies based on protein source,which may be related to AA release *** this experiment,a 2×2 factorial arrangement with casein(CAS)-enriched or corn gluten meal(CGM)-enriched protein sources at different digestible crude protein levels(normal[N],13%;and low[L],11%)were applied to 24 crossbred(DurocLandraceYorkshire)growing pigs(average body weight=43.3±3.5 kg)in 4 treatments(***,***,***,***,respectively)to investigate the effects of AA release kinetics on nitrogen deposition in growing *** ileal digestible AA in all diets were balanced by adding individual AA to meet the nutrient *** AA release kinetics were detected in vitro by measuring the hydrolysis of various protein diets under pepsin and trypsin *** results demonstrated that the time of AA release peak in the CGM diet was 12 h later than that in the CAS *** synchronization indices of dietary AA release in ***,***,***,and *** were 23.73%,29.37%,23.40%,and 26.07%,*** *** had the poorest AA release synchronism while the *** had the greatest among the 4 ***,within the pigs,*** and *** showed the highest(81.08%)and lowest(73.54%)nitrogen biological values,respectively,despite the standard ileal digestible AA levels being equal for all *** results indicate that the release kinetics of dietary AA had great effect on nitrogen *** optimize nitrogen deposition,AA release kinetics and composition should be taken into consideration when formulating diets for growing pigs.

关键词： Amino acid Growing pig Nitrogen deposition Release kinetics Synchronization

Self-healed microcracks in polymer bonded explosives via thermoreversible covalent bond and hydrogen actions

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Defence Technology（防务技术） 2023年第10期28卷 183-194页

作者： Yu-bin li Xu Zhao Ya-jun Luo Zhi-jian Yang li-ping pan Cheng-cheng Zeng Cong-mei lin Xue Zheng Institute of Chemical Materials China Academy of Engineering PhysicsMianyang621900China

Polymeric materials used for the polymer bonded explosive(PBX)or other energetic composite materials(ECMs)that simultaneously possess excellent mechanical properties and high self-healing ability,convenient healing,and facile fabrication are always a huge ***,self-healing linear polyurethane elastomers(PTMEG2000-IPDI-DAPU,denoted as 2I-DAPU)with high healing efficiency and mechanical properties were facilely fabricated by constructing reversible covalent bonds and dynamic hard domains into polymer ***,a TATB-based PBX using as-prepared 2I-DAPU polymer as the binder was constructed,disclosing an excellent self-healing property to heal cracks generated during fabrication,transportation and *** damage healing manner of such a PBX sample was investigated by means of prefabricated damage through mechanical load,heal treatment via heating at high temperature,and CT-scanning the inner structure and mechanical property characterization via Brazilian *** self-healing mechanism of internal damage in PBX was preliminarily *** propose that this 2I-DAPU binder with Diels-Alder bonds could generate plentiful active surface groups resulting from damage and drive self-healing at fitting temperature and increase the slightly packed hard phase via incorporating a small amount of hydrogen *** work may offer a novel strategy for improving mechanical property and healing ability in the field of self-healing material which could help expand its applications with enhanced versatility in mechanical-enhanced functional materials.

关键词： Polymer bonded explosives Self-healing polymers Diels-alder(DA)bonds H-bond

A Novel Worm-like In-Pipe Robot with the Rigid and Soft Structure

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Journal of Bionic Engineering 2023年第6期20卷 2559-2569页

作者： Delei Fang Guofeng Jia Junran Wu Xiaoru Niu pan li Rong Wang Yan Zhang Junxia Zhang Tianjin Key Laboratory of Integrated Design and On-line Monitoring for light Industry&Food Machinery and Equipment College of Mechanical EngineeringTianjin University of Science and TechnologyTianjin300222China The Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun130022China National Institute of Innovation Academy of Military SciencesBeijing100026China

Soft in-pipe robot has good adaptability in tubular circumstances,while its rigidity is insufficient,which affects the traction *** paper proposes a novel worm-like in-pipe robot with a rigid and soft structure,which not only has strong traction ability but also flexible mobility in the shaped *** the structure features of the earthworm,the bionic in-pipe robot structure is designed including two soft anchor parts and one rigid telescopic *** soft-supporting mechanism is the key factor for the in-pipe robot excellent performance,whose mathematical model is established and the mechanical characteristics are analyzed,which is used to optimize the structural *** prototype is developed and the motion control strategy is *** performances of the in-pipe robot are tested,such as the traction ability,moving velocity and *** comparative analysis,different operating scenarios are built including the horizontal pipe,the inclined pipe,the vertical pipe and other unstructured *** experiment results show that the in-pipe robot is suitable for many kinds of pipe applications,the average traction is about 6.8N,the moving velocity is in the range of 9.5 to 12.7 mm/s.

关键词： In-pipe robot Bionic design Rigid and soft structure Mechanical characteristics