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| 1 | Oxygen and Nitrogen Effects on MC Carbide in K465 Nickel-Base Superalloy显示文摘Effects of oxygen and nitrogen on MC carbide in nickel-base superalloy K465 were investigated, because neither of the two gas elements was found to decide MC carbide morphology monotonically. The morphology of MC carbide under alloy solidified in conventional investment casting condition was observed to transform from script-type to block-type with the total oxygen and nitrogen content (gas content) in samples rising up from 1.2×10-6 mol/g to 2.6×10-6 mol/g. The area fraction and composition of the MC carbide also varied with increase of gas content. However, the morphology of MC carbide kept to be script-type even when gas content was up to 3.4×10-6 mol/g in samples solidified with a much higher cooling rate. These results indicate that effects of gas content on formation of MC carbide can be observed in specimens solidified with low cooling rate, but such changes in MC carbide cannot be found when the cooling rate is high. | Wang L N Zheng Q Sun X F Guan H R Hu Z Q | 2009 | 稀有金属材料与工程2009，38，A03： | 4 |
| 2 | Identification and Analysis of Genetic Diversity Structure Within Pisum Genus Based on Microsatellite Markers显示文摘To assesse the genetic diversity among wild and cultivated accessions of 8 taxonomic groups in 2 species, and 5 subspecies under Pisum genus, and to analyze population structure and their genetic relationships among various groups of taxonomy, the study tried to verify the fitness of traditionally botanical taxonomic system under Pisum genus and to provide essential information for the exploration and utilization of wild relatives of pea genetic resources. 197 Pisum accessions from 62 counties of 5 continents were employed for SSR analysis using 21 polymorphic primer pairs in this study. Except for cultivated field pea Pisum sativum ssp. sativum var. sativum (94 genotypes), also included were wild relative genotypes that were classified as belonging to P. fulvum, P. sativum ssp.abyssinicum, P. sativum ssp. asiaticum, P. sativum ssp. transcaucasicum, P. sativum ssp. elatius var. elatius, P. sativum ssp. elatius var. pumilio and P. sativum ssp. sativum var. arvense (103 genotypes). The PCA analyses and 3-dimension PCA graphs were conducted and drawn by NTSYSpc 2.2d statistical package. Nei78 genetic distances among groups of genetic resources were calculated, and cluster analysis using UPGMA method was carried out by using Popgene V1.32 statistical package, the dendrogram was drawn by MEGA3.1 statistical package. Allelic statistics were carried out by Popgene V1.32. The significance test between groups of genotypes was carried out by Fstat V2.9.3.2 statistical package. 104 polymorphic bands were amplified using 21 SSR primer pairs with unambiguous unique polymorphic bands. 4.95 alleles were detected by each SSR primer pair in average, of which 65.56% were effective alleles for diversity. PSAD270, PSAC58, PSAA18, PSAC75, PSAA175 and PSAB72 were the most effective SSR pairs. SSR alleles were uniformly distributed among botanical taxon units under Pisum genus, but significant difference appeared in most pairwise comparisons for genetic diversity between taxon unit based groups of genetic resources. Genetic diversity level of wild species P. fulvum was much lower than the cultivated species P. sativum. Under species P. sativum, P. sativum ssp. sativum var. sativum and P. sativum ssp. asiaticum were the highest in gentic diversity, followed by P. sativum ssp. elatius var. elatius and P. sativum ssp. transcaucasicum, P. sativum ssp. elatius var. pumilio, P. sativum ssp. sativum var. arvense and P. sativum ssp. abyssinicum were the lowest. Four gene pool clusters were detected under Pisum genus by using PCA analysis. Gene pool 'fulvum' mainly consisted of wild species Pisum fulvum, gene pool 'abyssinicum' mainly consisted of P. sativum ssp. abyssinicum, and gene pool 'arvense' mainly consisted of P. sativum ssp. sativum var. arvense. While gene pool 'sativum' were composed by 5 botanical taxon units, they are P. sativum ssp. asiaticum, P. sativum ssp. elatius var. elatius, P. sativum ssp. transcaucasicum, P. sativum ssp. elatius var. pumilio and P. sativum ssp. sativum var. sativum. 'sativum' gene pool constructed the primary gene pool of cultivated genetic resources; 'fulvum' gene pool, 'abyssinicum' gene pool and 'arvense' gene pool together constructed the secondary gene pool of cultivated genetic resources. Pairwise Nei78 genetic distance among botanical taxon based groups of pea genetic resources ranged from 7.531 to 35.956, 3 large clustergroups were identified based on the UPGMA dendrogram. Group I equals to 'sativum' and 'arvense' gene pools, Group II equals to 'abyssinicum' gene pool, and Group III equals to 'fulvum' gene pool. The UPGMA clustering results generally supporting the PCA clusting results. There were significant differences among most botanical groups under Pisum genus, with clear separation of four gene pools for genetic diversity structure. The research results partially support the traditional botanical taxonomy under Pisum genus, and pointed out its advantage and shortcoming. In order to broaden the genetic bases of pea varieties, the genetic potentials in the four gene pools should be thoroughly exploited. | ZONG Xu-xiao Rebecca Ford Robert R Redden GUAN Jian-ping WANG Shu-min | 2009 | Agricultural Sciences in China2009，8，3： | 4 |
| 3 | The Maturation and Senescence in Relation to Ca^2+,CaMContent and Ca^2+-ATPase Activity and Active OxygenMetabolism in Strawberry Fruits显示文摘The changes in content of Ca2 + and CaM, Ca2 + -ATPase activity and active oxygen metabolism during strawberry (Fragaria ananassa Duch. cv. Chunxing) fruits maturation and senescence were investigated in this study. The results showed that the soluble Ca2 + content and SOD activity in fruits tended to decline and O2.-production rate to increase, the Ca2+ -ATPase activity peaked at first and then declined during fruits maturation and senescence. There were the highest CaM content at white stage in preharvest fruits and at marked senescence stage in postharvest ones. The above biochemical changes in fruits stored at low temperature (4℃) were slower than those stored at normal temperature(25℃ ). Thus, it indicated that the stimulation of calcium messenger system and accumulation of active oxygen free radical were closely related to fruits maturation and senescence. | GUAN Jun-feng, GAO Min, FAN Xiu-cai, GU Cai-qin, LI Guang-min and ZHANG Ji-shu(Institute of Agro-Physics , Plant Physiology and Biochemistry , Hebei Academy of Agricultural and Forestry Sciences ,Shijiazhuang 050051 , P. R . China College of Life Sciences , Northwestern Science and Technology Universityof Agriculture and Forestry, Yangling 712100 , P.R.China) | 2002 | Agricultural Sciences in China2002，1，10： | 3 |
| 4 | Magnetic resonance imaging of hepatocellular carcinoma induced by diethylnitrosamine in Sprague-Dawley rats显示文摘Diethylnitrosamine (DENA) is able to induce various benign and malignant liver lesions in rats with a high success rate and a low mortality rate. It provides a more appropriate model that better simulates the various lesions occurring in humans than the usual model of tumor implantations. The aim of the present study was to evaluate MRI liver examination in Sprague-Dawley(SD) rats as a routine method to detect hepatocellular carcinoma (HCC) nodules induced by DENA and to follow up their growth. METHODS:Hepatic carcinogenesis was induced in 80 male SD rats using oral DENA solution. All animals were imaged for liver tumor detection with a 1.5 Tesla magnet (Siemens Sonata,Erlangen, Germany) using correspondence scan parameters and a radio-frequency knee coil. Macroscopic examinations were performed along the axial MRI sections to evaluate magnetic resonance imaging (MRI) findings, and histopathological assessment was also performed. RESULTS:No false negative results were obtained on MR images. Hepatic tumors in 72 rats were confirmed macro-scopically and 68 rats were detected by MRI till the 20th week. The smallest and the largest nodules detected by MRI were 2 mm and 37 mm in diameter respectively. The agreement rate of MRI with macroscopic observation was 39. 1% and 97. 4% respectively for 2 mm to 5 mm and more than 5 mm nodules. CONCLUSIONS:The hepatic tumor induced by DENA provides a more representative range of tumors for imaging diagnosis and interventional treatment. MRI is the best approach for scrutinizing pathological changes of rat livers in the period of observation. | Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China (Li X, Zhou XP and Guan YS) Department of Radiology, Ruijin Hospieal. Shanghai Second Medical University, Shanghai 200025 , China. Current address:Astra Zeneca R & D Alderley, Macclesfield SK 10 4 TG U. K. (Wang YX) | 2005 | Hepatobiliary & Pancreatic Diseases International2005，4，3： | 3 |
| 5 | Quantitative analysis of Boehm' s GC显示文摘The term garbage collection describes the automated process of finding previously allocated memorythatis no longer in use in order to make the memory available to satisfy subsequent allocation requests. Wehave reviewed existing papers and implementations of GC, and especially analyzed Boehm' s C codes, which isa real-time mark-sweep GC running under Linux and ANSI C standard. In this paper, we will quantitatively an-alyze the performance of different configurations of Boehm' s collector subjected to different workloads. Reportedmeasurements demonstrate that a refined garbage collector is a viable alternative to traditional explicit memorymanagement techniques, even for low-level languages. It is more a trade-off for certain system than an all-or-nothing proposition. | GUAN Xue-tao~*, ZHANG Yuan-rui, GOU Xiao-gang, CHENG Xu (MicroProcessor R & D Center, Peking University, Beijing 100871, China, | 2003 | Journal of Harbin Institute of Technology(New Series)2003，10，3： | 2 |
| 6 | Study on Storage Facilities of Agricultural Products in Courtyard in China显示文摘Mini storage facilities applicable in rural areas in China have been developed after nine years of research. Optimal design of structure and refrigeration system, facilities optimization, computer control and management technology are studied and developed. | CHEN Li, LI Xi-Hong, XIA Qiu-Yu, HU Yun-feng and GUAN Wen-qiang( National Engineering and Technology Research Center for Agricultural Products Freshness Portection , Tianjin 300112 Tianjin Commune of Science and Technology, Tianjin 300003 , P. R . China ) | 2002 | Agricultural Sciences in China2002，1，7： | 2 |
| 7 | Chemopreventive effects of alpha - santalol on ultraviolet B radiation - induced skin tumor development in SKH - 1 hairless mice 显示文摘 | Dwivedi C Valluri HB Guan X Agarwal R | 2006 | Carcinogenesis2006，27，9： | 1 |
| 8 | Homogeneous free radical polymerizations in supercritical carbon dioxide 2:thermal decomposition of 2,2′-azobis(isobutyronitrile)显示文摘 | Guan Zhibin Combes J R Menceloglu Y Z | 1993 | Macromolecules1993，26，11： | 1 |
| 9 | Photocatalytic degradation of methylene blue by a combination of TiO2 and actived carbon fibers显示文摘 | YU R S GUAN R B SHEN W Z | 2005 | Journal of Colloid and Interface Science2005，282，1： | 1 |
| 10 | Multitangent-plane surface method for reliability calculation显示文摘 | Guan X L Melchers R E | 1997 | J Eng Mech1997，123，10： | 1 |
| 11 | Efficacy and safety of 5 years lamivudine treatment of Chinese patients with chronic hepatitis B 显示文摘 | Guan R Lai CL Liaw YF | 2001 | J Gastroenterol Hepatol2001，16，： | 1 |
| 12 | Chronic hepatitis Bvirus infection in Asian countries显示文摘 | Schroter I Guan R Amarapuka D | 2000 | J Gastroenterol Hepatol2000，15，12： | 1 |
| 13 | Molecularly Imprinted Polymer Surfaces as Solid-phase Extraction Sorbents for the Extraction of2-Nitrophenol and Isomers from Environmental Water显示文摘 | Guan W Han C R Wang X | 2012 | J Sep Sci2012，35，49： | 1 |
| 14 | Cytotoxicity,oxidative stress,and genotoxicity in human hepatocyte and embryonic kidney cells exposed to ZnO nanoparticles显示文摘 | Guan R Kang T Lu F | 2012 | Nanoscale Res Lett2012，7，1： | 1 |
| 15 | Preparation and electrochemical properties of AI/Pb-PANI-WC composite inert anodes 显示文摘 | XU R D GUAN Y Y CHEN H S | 2013 | Journal of the Chinese Advanced Materials Society2013，1，1： | 1 |
| 16 | Role of autophagy in angiogenesis in aortic endothelial cells显示文摘 | Du J Teng R J Guan T | 2012 | Am J Physiol Cell Physiol2012，302，2： | 1 |
| 17 | Identification of New Delhi metallo-J3-1actamase gene (NDM-1) from a clini- cal isolate of Acinetobacter junii in China显示文摘 | Zhou Z Guan R Yang Y | 2012 | Can J Microbio12012，58，1： | 1 |
| 18 | Oxidation behavior and breakdown of an aluminide coating on DZ40M alloy at high temperatures显示文摘 | Liu P S Liang K M Zhou H Y Guan H R Sun X F Jin T Yang K N | 2001 | Oxidation of Metals2001，55，56： | 1 |
| 19 | Growth hormone receptor is a target for presenilin-dependent gam- ma-secretase cleavage 显示文摘 | Cowan J W Wang X D Guan R He K Jiang J Baumann G Black R A Wolfe M S Frank S J | 2005 | J Biol Chem2005，280，19： | 1 |
| 20 | Oxygen isotopic compositions of chonch-ules: Implications for evolution of oxygen isotopic reservoirs in the inner solar nebula显示文摘 | Krot A N Yurimoto H Mckeegan K D Leshin L Chaussidon M Libourel G Yoshitake M Huss G R Guan Y Zanda B | 2006 | Chem Erde2006，66，4： | 1 |
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