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Genetic variability of Rhizoctonia solani Kühn and its resistance to fungicides

Studies in Fungi 2020年第1期5卷 381-391页

作者： Castillo RF Gallegos G Flores OA aguilar gc Rodriguez HR Hernandez CFD Saltillo Experimental Station Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias.Carr.Saltillo-Zacatecas km 342+119No.9515Col.ExHacienda de BuenavistaSaltilloCoah.C.P.25315 Department of Agricultural Parasitology Universidad Autónoma Agraria Antonio NarroBuenavista25315SaltilloCoahuilaMéxico Food Research Department School of Chemical SciencesUniversidad Autónoma de Coahuila25000SaltilloCoahuilaMexico

The aims of this study are to determine the population genetic structure of Rhizoctonia solani,associated with potato,and to assess its resistance degree to pencycuron and thiabendazole fungicides.A total of 57 strains of *** were isolated from different potato crop fields in Mexico,and were classified according to their anastomosis group(AG)using the polymerase chain reaction(PCR)and restriction fragment length polymorphism(RFLP)-based ***,the amplified fragments were digested with four different endonucleases(Mse I,Ava II,Mun I and Hinc II).The Repetitive Element Sequence-Based PCR(rep-PCR)technique was used to determine the genetic diversity in *** *** obtained by PCR-RFLP showed that 81%of the isolates were identified as belonging to AG-3 group,14%to AG1-1B and 5%to AG-11 *** response to fungicides inhibition,IC_(50)between 0.014-0.039 mg a.i./L for pencycuron,and 0.82 to 2.91 for thiabendazole were determined,This IC_(50)value showed that the resistance factor(RF)values ranged from 1.4 to 3.945 and 0.27 to 0.97,respectively;this tendency suggests that isolates are susceptible to *** AG groups showed a heterogeneous resistance to pencycuron and thiabendazole,being more tolerant to these fungicides AG1-1B and AG-11 *** genetic analysis shows a low genetic diversity among(P-value 0.3225)and within(P-value 0.3275)populations;this can indicate a clonal reproduction and little parasexual cycle among the analyzed isolations.

关键词： Anastomosis group genetic diversity genetic resistance Mexico PCR RFLP parasexual cycle REP PCR Wright’s statistics

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Computational Study on Furnace Process in a Multi-burner Boiler of Pulverized Coal Fired Tangentially at Four Corners

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Journal of Central South University 2000年第3期12卷 152-155页

作者： Zhou, P Mei, C Cong, gc Cent S Univ Technol Dept Appl Phys & Heat Engn Changsha 410083 Peoples R China

Aiming at the optimization of the operation condition, a general numerical method for calculating pulverized coal combustion in a full scale furnace fired tangentially at four corners is adopted. “ k ε ” turbulence model is used for the gas phases and a stochastic approach based on the Lagrangian technique is used for particle phases. Two competing reactions model for the coal devolatilization and PDF (the probability density function) method for the combustion of the gas phases are employed. In the numerical simulations, assuming the air distribution of second port level is of pagoda, waist drum and uniform type. The results show that pagoda type air distribution is advantageous to ignition and smooth combustion of pulverized coal, and suitable to inferior coal combustion in practice. In the present furnace, the igniting distance at 1st and 3rd corner is longer than that at 2nd and 4th corner. The results from numerical calculations are in good agreement with those of observed in practice.

关键词： power station boiler combustion of pulverized coal numerical simulation

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Critical Transitions of Microviscosity in Concentrated Polystyrene Solutions Revealed by Excimer Formation of Pyrenyl Probes

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Chinese Chemical Letters 1997年第6期8卷 543-546页

作者： Gao, H Wang, gc He, BL NANKAI UNIV STATE KEY LAB FUNCT POLYMER MAT ADSORPT & SEPARATINST POLYMER CHEMTIANJIN 300071PEOPLES R CHINA

Excimer formation of pyrene and benzyl 4-(1-pyrenyl) butanoate was used to study the microviscosity of polystyrene/toluene solutions over the entire concentration range. Two critical concentrations (C(PS)similar to 0.32, 0.82g/ml) have been observed from the log-log plot of IB/IM vs C-PS. The results are explained in terms of the onset of cohesional interaction and the glass transition of the polymer chains, respectively.

关键词： Critical Transitions of Microviscosity in Concentrated Polystyrene Solutions Revealed by Excimer Formation of Pyrenyl Probes

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Construction of energy transfer model of C-phycocyanin and allophycocyanin from Spirulina platensis

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Chinese Science Bulletin 1997年第1期42卷 69-72页

作者： Wang, gc Zhou, BC Zeng, CK Experimental Marine Biology Laboratory Institute of Oceanology Chinese Academy of Sciences Qingdao China

PHYCOBILIPROTEINS. which include phycoerythrin, phycocyanin, phycoerythroeyanin and allophycocyanin, are intensively coloured, highly fluorescent, water soluble chromoproteins. They are composed of at least two dissimilar polypeptides, α and β subunits, in a molar ratio of 1:1. The subunits possess linear tetrapyrrole prosthetic groups covalently linked to the primary structure via cysteine thioether linkages. In blue-green and red algae, phycobiliproteins occur in a supramolecular structure, the phycobilisome, located on the surface of thylakoid to

关键词： Spirulina platensis C-phycocyanin allophycocyanin covalent conjugate energy transfer.

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Risk of malignancy in Caroli disease and syndrome: A systematic review

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World Journal of Gastroenterology 2020年第31期26卷 4718-4728页

作者： Rene Fahrner Sandra gc Dennler Daniel Inderbitzin Department of Surgery Bürgerspital SolothurnSolothurn 4500Switzerland Department of Surgery University Hospital DresdenDresden 01307Germany

BACKGROUND Congenital intrahepatic bile duct dilatation without fibrosis is called Caroli disease(CD),and is called Caroli syndrome(CS)when it has fibrotic and cirrhotic liver *** development of intrahepatic carcinoma is described in both conditions,but the reported incidence varies *** risk factors for the malignant transformation were not ***,conservative or surgical treatment is performed depending on the extent of cystic malformation,hepatic dysfunction and structural hepatic changes,but little is known about which treatment should be offered to patients with CD or CS and *** To further investigate the malignant transformation in these *** A systematic review of the current literature until January 2019 was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement.A search using Medline(PubMed)was performed using a combination of Medical Subject Headings terms“caroli disease”,“caroli syndrome”,“tumor”,“malignant”,and“cholangiocarcinoma”.Only human studies published in English were used for this systematic *** following parameters were extracted from each article:year of publication,type of study,number of patients,incidence of malignant tumor,duration of symptoms,age,sex,diagnostics,identification of tumor,surgical therapy,survival and tumor *** Twelve retrospective studies reporting the courses of 561 patients(53%females)were included in this systematic *** a mean age of 41.6 years old(range 23 to 56 years old),patients were younger than other populations undergoing liver *** on the size of the study population the incidence of cholangiocarcinoma varied from 2.7%to 37.5%with an overall incidence of 6.6%.There were only few detailed reports about preoperative diagnostic work-up,but a multimodal work-up including ultrasound of the liver,computed tomography,magnetic resonance imaging and endoscopic retrograd

关键词： Malignancy Caroli disease Caroli syndrome Tumor Cholangiocarcinoma Review

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Damping Behaviour and Mechanism of Graphite ParticulateReinforced Metal Matrix Composites

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Journal of Materials Science & Technology 1997年第6期13卷 447-451页

作者： Liu, YC Yang, gc Lu, YL Zhu, ZG Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Peoples R China Acad Sinica Inst Solid State Phys Internal Frict & Defects Solids Lab Hefei 230031 Peoples R China

The effect of graphite particulate reinforcement on the resultant damping behaviour of ZA27 metal matrix composites (MMCs) has been investigated in an effort to develop a new functional material. The MMCs were processed by a spray atomization and deposition technique. The damping capacity, as well as the relative dynamic modulus, was measured at frequencies of 1 and 4 Hz in the 30 to 200 degrees C temperature range. There exists a transformation point at 55 degrees C in the internal friction and temperature spectrum of the MMCs. It is shown from microstructural analysis that the damping capacity of ZA27 can be significantly improved by the addition of graphites particulates through spray deposition processing. Finally, the operative damping mechanism is discussed in light of the data obtained from characterization of microstructure and damping capacity.

关键词： Graphite Damping Behaviour and Mechanism of Graphite ParticulateReinforced Metal Matrix Composites

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Interaction　of　Polyelectrolyte　with　Fluorocarbon　Surfactant　in　Aqueous　Solution

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Chinese Chemical Letters 1996年第10期7卷 951-953页

作者： Wang, YZ Ji, HF Tung, CH Yue, gc ACAD SINICA INST PHOTOG CHEMBEIJING 100101PEOPLES R CHINA JILIN UNIV DEPT ENVIRONM SCICHANGCHUN 130023PEOPLES R CHINA

The variation of the I1/I3 ratio of the fluorescence of pyrene in polystyrene-based quaternary ammonium salt (PA) and sodium carboxymethylamylose (NaCMA) aqueous solutions was measured as a function of sodium perfluorooctanoate (SPFO) concentration. Association of the anionic fluorocarbon surfactant with cationic polyelectrolyte (PA) to form mixed micelles occurred at the surfactant concentrations far below its normal critical concentration, while no interaction between SPFO and anionic polyelectrolyte (NaCMA) was detected. The driving force for the formation of mixed micelles of *** PA is electrostatic interactions.

关键词： Aqueous Surfactant Fluorocarbon Polyelectrolyte Interaction

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Synthesis of some new germasesquioxides by intramolecular catalytic Mannich-type reactions

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Chinese Journal of Chemistry 1997年第6期15卷 548-552页

作者： Zhang, ZB He, DY Chi, gc Chen, RY Nankai Univ Inst Elementoorgan Chem State Key Lab Elementoorgan Chem Tianjin 300071 Peoples R China

A convenient procedure for the preparation of some new germasesquioxides containing phosphonyl groups carried by an intramolecular catalytic Mannich-type reaction is reported.

关键词： germasesquioxide Mannich-type reaction synthesis

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Discovery and geologic significance of organic-biogenic secondary freshwater calcite in the Upper Triassic of Shaan-Gan-Ning Basin

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Chinese Science Bulletin 1997年第15期42卷 1297-1300页

作者： Zhang, WZ Huang, YM Song, gc Zan, CL Research Institute of Petroleum Exploration and Development Changqing Bureau of Petroleum Exploration Changqing China

1 Discovery of secondary freshwater calciteFROM well ZJ-23, around 22 m of condensed limestone has been found in member Chang-3 ofthe Upper Triassic Yanchang Formation. Electric log reflects high resistivity, higher densityof rock and lower values of natural gama, with calcite content of 40%—80%. Observation da-ta of 11 core wafers from 883. 05—887.20 m of the well demonstrate that high-angle struc-tural fracture (2 mm wide) and micro-fracture are relatively developed and fully or half

关键词： secondary calcite isotope genesis oil and gas migration.

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Novel　Type　CO_2　Methanation　Catalysts　over　Ni／Sepiolite　and　Ru／Sepiolite　System

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Chinese Chemical Letters 1996年第10期7卷 956-959页

作者： Deng, gc Xu, L Mu, RC Chen, RT Lu, W NANKAI UNIV DEPT CHEMTIANJIN 300071PEOPLES R CHINA TIANJIN ENVIRONM PROTECT BUR TIANJIN 300191PEOPLES R CHINA

A Novel type single-component catalyst in which small amounts of nickel of ruthenium supported on sepiolite nas found to be a very efficient methanation catalyst for carbon dioxide at high space velocity.

关键词： Ru and Type over Methanation Novel Sepiolite System CO2 Catalysts 二氧化碳 Ni

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