检索结果-南通市图书馆

国外花岗岩类地质与矿产 1993年第1期 1-8,36页

作者： bur.,DJM

Production and characterization of ZnO nanoparticles and porous particles by ultrasonic spray pyrolysis using a zinc nitrate precursor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第7期19卷 651-656页

作者： bur.ak Ebin Elif Arτg bur.k zkal Sebahattin Gürmen Metallurgical & Materials Engineering Department Istanbul Technical University

ZnO nanoparticles and porous particles were produced by an ultrasonic spray pyrolysis method using a zinc nitrate precursor at various temperatures under air atmosphere. The effects of reaction temperature on the size and morphology of ZnO particles were investi- gated. The samples were characterized by energy dispersive spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. ZnO particles were obtained in a hexagonal crystal structure and the crystallite shapes changed from spherical to hex- agonal by elevating the reaction temperature. The crystallite size grew by increasing the temperature, in spite of reducing the residence time in the heated zone. ZnO nanoparticles were obtained at the lowest reaction temperature and ZnO porous particles, formed by aggregation of ZnO nanoparticles due to effective sintering, were prepared at higher temperatures. The results showed that the properties of ZnO particles can be controlled by changing the reaction temperature in the ultrasonic spray pyrolysis method.

关键词： zinc oxide nanoparticles nanocrystallites porous materials ultrasonic applications spray pyrolysis

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

双流化床生物质气化系统的工艺分析

新能源 1989年第10期11卷 24-32页

作者： bur.,VRK 高先培

一种用于探头校准小型稠密等离子体焦点中子源

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

核武器与高技术 1997年第4期 59-65页

作者： bur.,EJT 黄华国

１．４ｋＪ的超清洁Ｍａｔｈｅｒ型稠密等离子体焦点中子源已无失败、无需更新气体下连续发射了６５０次１４ＭｅＶ的中子。每次发射的平均Ｄ－Ｔ中子输出是（３．４±０．８）×１０＾９中子。Ｄ－Ｔ中子脉冲用来校准闪炮体光电倍增器... 详细信息

１．４ｋＪ的超清洁Ｍａｔｈｅｒ型稠密等离子体焦点中子源已无失败、无需更新气体下连续发射了６５０次１４ＭｅＶ的中子。每次发射的平均Ｄ－Ｔ中子输出是（３．４±０．８）×１０＾９中子。Ｄ－Ｔ中子脉冲用来校准闪炮体光电倍增器中子探头。

关键词：稠密等离子体中子源等离子体焦点

Effect of early atopic sensitization in children aged 0–2 years on the development of asthma symptoms at 9–11 years of age

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2022年第11期18卷 753-760页

作者： Himmet Haluk Akar Ebru Nadir bur.in Beken Yakup Yeşil Division of Pediatric Immunology and Allergy University of Istanbul Health SciencesKanuni Sultan Suleyman Training and Research HospitalIstanbulTurkey Division of Pediatrics University of Istanbul Health SciencesKanuni Sultan Suleyman Training and Research HospitalIstanbulTurkey Department of Pediatric Immunology and Allergy School of MedicineAcibadem Mehmet Ali Aydinlar UniversityIstanbulTurkey

Background Personal genetic predisposition and early life environmental factors are important for the development of childhood *** aimed to search whether egg,milk and mite sensitizations at 0–2 years old are risk factors for asthma symptoms at 9–11 years *** A total of 210 wheezer children who had specific immunoglobulin(Ig)E in 2010–2012 were included in the study(followed by pediatric allergy).Patients were divided into non-atopic(group 1,n=157)and atopic patients[groups 2–7,n=53(5 patients were in both group 4 and group 5)]based on *** the International Study of Asthma and Allergy in Childhood questionnaire,current wheeze(CW,2nd question),exercise wheezing(EW,7th question),and dry cough(DC,8th question)were ***,parental allergies,eczema at 0–2 years,current eosinophil percentage and total IgE were *** Eczema was observed as an important risk factor[CW:odds ratio(OR)=2.83,95%confidence interval(CI)=1.54–5.23,P≤0.001;EW:OR=2.71,95%CI=1.33–5.54,P=0.006;DC:OR=3.03,95%CI=1.47–6.25,P=0.003],whereas having no atopic sensitization at 0–2-year-old(group 1)was found as a significant protective factor for asthma at 9–11 years old(CW:OR=0.32,95%CI=0.15–0.70,P=0.004;EW:OR=0.21,95%CI 0.10–0.44,P≤0.001;DC:OR=0.25,95%CI=0.10–0.59,P=0.002).Conclusion Early personal eczema is a significant risk factor for the development of asthma symptoms at 9–11 years old,whereas not having an allergic sensitization at 0–2 years old(group 1)is an important protective factor.

关键词： Asthma Children Risk factors

Cancer Cell：癌细胞如何在没有葡萄糖的条件下继续增殖扩张？

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代生物医学进展 2017年第2期17卷 I0001-I0002页

作者： Stefan bur.n Structural Biology and Biocomputing Programme Spectroscopy and Nuclear Magnetic Resonance Unit Centro Nacional de Investigaciones Oncológicas CNIO Madrid 28029 Spain

肿瘤细胞最主要的目标就是生存，其甚至不惜破坏其所依附的有机体的健康也要达到生存的目的；为了生存肿瘤细胞会练就许多健康细胞没有的本领，包括在葡萄糖水平极低的情况下继续保持生长势头，而这或许就是常用的抗血管生成因子难以消... 详细信息

肿瘤细胞最主要的目标就是生存，其甚至不惜破坏其所依附的有机体的健康也要达到生存的目的；为了生存肿瘤细胞会练就许多健康细胞没有的本领，包括在葡萄糖水平极低的情况下继续保持生长势头，而这或许就是常用的抗血管生成因子难以消除癌症的主要原因，肿瘤细胞通常会通过妨碍提供常规的营养物质和葡萄糖的血管的发育来影响机体健康，

关键词：葡萄糖水癌细胞 Cell 血管生成因子增殖肿瘤细胞机体健康营养物质

Genetic diversity,phylogenetic position and morphometric analysis of Astacus colchicus(Decapoda,Astacidae):a new insight into Eastern European crayfish fauna

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2021年第3期16卷 368-378页

作者： Martin BLÁHA JiríPATOKA Bella JAPOSHVILI Marek LET Milošbur.ICˇ Antonín KOUBA Levan MUMLADZE Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of HydrocenosesUniversity of South Bohemia in CˇeskéBudeˇjoviceVodnˇanyCzech Republic Department of Zoology and Fisheries Faculty of AgrobiologyFood and Natural ResourcesCzech University of Life Sciences PraguePrahaCzech Republic Institute of Zoology of Ilia State University TbilisiGeorgia

The phylogeny of European crayfish fauna,especially with respect to Eastern European species,is still far from being completely *** fill this gap,we analyzed most of the European crayfish species focusing on the phylogenetic position of the endemic crayfish Astacus colchicus,inhabiting *** mitochondrial and one nuclear marker were used to study evolutionary relationships among European crayfish species,resulting in the unique phylogenetic position of *** indicating independent species status to *** analyses revealed a deep molecular divergence of *** in comparison to ***(6.5–10.9%in mtDNA and 1.1%in nDNA)as well as to Pontastacus leptodactylus and ***(5.5–10.0%in mtDNA and 1.4–2.4%in nDNA).Absent ventral process on second male pleopod and abdominal somites II and III with pleura rounded lacking prominent spines clearly indicate taxonomic assignment to the genus Astacus;however,the species is distributed almost in the middle of Ponto-Caspian area typical by occurrence of the genus *** morphological indices linked to head length,carapace,and total body length and width were found to demonstrate apparent differences between *** and *** this study provides a novel insight into European crayfish phylogeography,we also point out the gaps in comprehensive study of the *** species complex,which could reveal details about the potential species status of particular species and subspecies within this genus.

关键词： 12S rRNA 16S rRNA cytochrome c oxidase histone H3 Ponto-Caspian crayfish

Production of nanocrystalline silver particles by hydrogen reduction of silver nitrate aerosol droplets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第3期23卷 841-848页

作者： bur.ak EBIN Elif YAZIC I Sebahattin GüRMEN Department of Metallurgical & Materials Engineering Ist anbul Technical University34469IstanbulTurkey

Nanocrystalline silver particles were produced by hydrogen reduction of silver nitrate aerosol droplets formed by high frequency ultrasonic *** dependences of the particle size,morphology and crystallite size on the precursor concentration and the reaction temperature were *** spray pyrolysis process was combined with hydrogen reduction to research the effects on the silver particle *** silver particles including slight oxide structure were prepared at temperature as low as 200 ℃ from silver nitrate under hydrogen atmosphere.X-ray diffraction（XRD） studies showed that pure silver particles were obtained above 200 ℃ reaction *** crystallite sizes of the samples ranged from 29 to 47 *** results indicate that the crystallite sizes hardly ever depended on the reaction *** slightly enlarged by increasing precursor *** observations showed that particles were obtained in spherical morphology with particle sizes between 210 and 525 *** temperature and precursor concentration strongly influenced the particle size.

关键词： silver particles nanocrystalline materials aerosol process hydrogen reduction

Oxidative stress and nitric oxide in rats with alcohol-induced acute pancreatitis

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第15期11卷 2340-2345页

作者： Gülnur Andican Remisa Gelisgen Ethem Unal Osman Baran Tortum Sergülen Dervisoglu Tayfun Karahasanoglu Gülden bur.?)ak Department of Biochemistry Department of Surgery Department of Pathology

AIM: Oxygen free radical mediated tissue damage is well established in pathogenesis of acute pancreatitis (AP).Whether nitric oxide (NO) plays a deleterious or a protective role is unknown. In alcohol-induced AP, we studied NO, lipooxidative damage and glutathione in pancreas, lung and ***: AP was induced in rats (n = 25) by injection of ethyl alcohol into the common biliary duct. A sham laparatomy was performed in controls (n = 15). After 24 h the animals were killed, blood and tissue sampling were ***: Histopathologic evidence confirmed the development of AP. Marked changes were observed in the pulmonary tissue. Compared with controls, the AP group displayed higher values for NO metabolites in pancreas and lungs, and thiobarbituric acid reactive substances in circulation. Glutathione was lower in pancreas and in circulation. Glutathione and NO were positively correlated in pancreas and lungs of controls but negatively correlated in circulation of experimental group. In the experimental group, plasma thiobarbituric acid reactive substances were negatively correlated with pancreas thiobarbituric acid reactive substances but positively correlated with pancreas ***: NO increases in both pancreas and lungs in AP and NO contributes to the pathogenesis of AP under oxidative stress.

关键词： Thiobarbituric acid reactive substances Glutathione Nitric oxide Acute pancreatitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

浅议填土的工程性质与地基处理原则

土工基础 2004年第5期18卷 66-68页

作者：罗明南昌市建筑设计研究院江西330008

填土的检测评价与地基处理是工程建设中经常遇见的重要课题之一,本文分析归纳了填土的工程性质,并结合工程实例对填土的检测和地基处理原则进行了初浅的探讨。

关键词：地基处理填土工程性质工程实例工程建设检测评价