检索结果-南通市图书馆

POLYMERIZATION OF 1-AZABICYCLO[4.2.0]OCTANE WITH CHIRAL TRICYCLIC AMINO ACID ESTERS FOR OBTAINING BIOMEDICAL MATERIALS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2010年第1期28卷 39-44页

作者： cigdem Yolacan Irem Kulu Nuket Ocal Yildiz Technical University Faculty of Art and SciencesDepartment of ChemistryDavutpasa Campus 34210 EsenlerIstanbulTurkey

The cationic ring-opening polymerization of 1-azabicyclo[4.2.0]octane, commonly called conidine （1） was studied with some chiral tricyclic amino acid esters （6a-6f） as acylation agents to obtain optically active biopolymers （Sa-8f） of the different masses. The structures of the new compounds were confirmed by FT-IR, UV and NMR, and the distribution index of the molecular weights of the polymers was determined from SEC measurements.

关键词： Conidine Cationic ring-opening polymerization Optically active polymers.

Robotic transoral vestibular parathyroidectomy:Two case reports and review of literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2018年第12期6卷 542-547页

作者： Yasar Ozdenkaya Cenk Ersavas Naciye cigdem Arslan Department of General Surgery Medipol University

Advances in preoperative localization studies and de-mands for scarless surgery have promoted the inves-tigation for remote techniques in parathyroid surgery. Transoral vestibular approach seems to provide the most comfortable and safest access to the neck. In this paper, we report our initial experience with robotic transoral ves-tibular parathyroidectomy(RTVP) in four patients with primary hyperparathyroidism. The surgery was perfor-med with the Da Vinci system through three trocars intro-duced from the lower lip vestibule. The procedure was converted to open in two patients due to inappropriate preoperative localization. The mean operative time was 169 min. No postoperative complications were seen. Patients were discharged on postoperative day 1. RTVP is a feasible and safe technique, which allows better surgical exposure and manipulation of the instruments. The advantages of transoral vestibular approach can be enhanced by robotics. Further studies are needed to analyze complications and costs.

关键词： Transoral vestibular surgery Parathyroid adenoma Natural orifice transendoluminal surgery Robotics Parathyroidectomy

Diagnosis and phylogenetic analysis of orf virus in Aleppo and Saanen goats from an outbreak in Turkey

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Virologica Sinica 2016年第3期31卷 270-273页

作者： Zeynep Akkutay-Yoldar Tuba cigdem Oguzoglu Yilmaz Akca Department of Virology Faculty of Veterinary MedicineAnkara University

Dear Editor,The Poxviridae family is divided into Chordopoxvirinae and Entomopoxvirinae *** is one of 11genera in the Chordopoxvirinae genus,including orf virus(ORFV),bovine papular stomatitis virus(BPSV),pseudocowpox virus(PCPV)and parapoxvirus of red deer in New Zealand(PVNZ)(Skinner et al.,2012).This virus,also known as contagious ecthyma or contagious pustular dermatitis,is a viral skin disease causing edematous proliferative lesions,most often in hairless

关键词：病毒进化羊口疮土耳其昆虫痘病毒传染性脓疱性皮炎诊断爆发羊传染性脓疱

On Chlodowsky Variant of Baskakov Type Operators

在线全文

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 2018年第4期34卷 323-335页

作者： cigdem Atakut Ibrahim Buyfikyazlcl Ankara University Faculty of ScienceDepartment of Mathematics 06100 TandoganAnkaraTurkey

In the present paper, we deal with Chlodowsky type generalization of the Baskakov operators, special case of these operators includes Chlodowsky type Meyer–K?nig and Zeller operators(see [21]). With the help of Bohman-Korovkin theorem,we obtain some approximation properties for these operators. We give a modification of the operators in the space of differentiable functions and we also present examples of graphs for approximation. Finally, we apply these operators to the solution of the differential equation.

关键词： Approximation properties Rate of convergence Chlodowsky type MKZ operators Baskakov operators Differential equation

Magnetic-porous microspheres with synergistic catalytic activity of small-sized gold nanoparticles and titania matrix

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2019年第3期13卷 574-585页

作者： Kadriye Ozlem Hamaloglu Ebru Sag cigdem Kip Erhan Senlik Berna Saracoglu Kaya Ali Tuncel Hacettepe University Chemical Engineering DepartmentAnkaraTurkey Cumhuriyet University Chemical Engineering DepartmentSivasTurkey

Fe3O4 nanoparticles immobilized on porous titania in micron-size range were decorated with smallsized gold nanoparticles and used as a plasmonic catalyst for the reduction of 4-nitrophenol. Monodisperse-porous magnetic titania microspheres were synthesized with bimodal pore-size distribution by the sol-gel templating method. Small-sized gold nanoparticles obtained by the Martin method were attached onto the aminated form of the magnetic titania microspheres. A significant enhancement in the catalytic activity was observed using the gold nanoparticle-decorated magnetic titania microspheres compared to gold nanoparticle-decorated magnetic silica microspheres because of the synergistic effect between small-sized gold nanoparticles and titania. The synergistic effect for gold nanoparticle-attached magnetic titania microspheres could be explained by surface plasmon resonance-induced transfer of hot electrons from gold nanoparticles to the conduction band of titania. Using the proposed catalyst, 4-nitrophenol could be converted to 4-aminophenol in an aqueous solution within 0.5 min. The 4-nitrophenol reduction rates were 2.5-79.3 times higher than those obtained with similar plasmonic catalysts. The selection of micron-size, magnetic, and porous titania microspheres as a support material for the immobilization of small-sized gold nanoparticles provided a recoverable plasmonic catalyst with high reduction ability.

关键词： small-sized gold nanoparticles magnetic titania microspheres sol-gel template synthesis plasmonic catalysis 4-nitrophenol

Efficient Plant Regeneration with Arabinogalactan-Proteins on Various Ploidy Levels of Cereals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第3期12卷 420-425页

作者： Yasemin Coskun Ragbet Ezgi Duran cigdem Savaskan Tunhan Demirci Mehmet Tolgahan Hakan Department of Biology Faculty of Arts and Sciences Suleyman Demirel University

To determine the most effective dose of arabinogalactan-protein （AGP） in regeneration medium, mature embryos of genotypes in three different ploidy levels （Triticum aestivum L. cv. Ikizce-96, Triticum durum Desf. cv. Mirzabey and Hordeum vulgare L. cv. Tokak） were used to establish an efficient plant regeneration system for cereals. Percentage of callus production, capacity of regeneration were calculated, and also culture effect, root, stem, and total plant length of regenerant plants were observed in six different regeneration media （MS control, MS＋2, 5, 7, 10, 12 mg L-1 AGP） in these three different genotypes. According to the results, the highest amount of callus production was found in Ikizce-96 as 93.75% using 5 mg L-1 dicamba and 1 mg L-1 kinetin in induction medium. However, the most improved callus was observed in diploid barley Tokak as 179.95 mg in weight and 6.18 mm in diameter, respectively. The highest regeneration capacity was observed in the dose of 5 mg L-1 AGP in MS of all the genotypes and hexaploid wheat Ikizce-96 gave the best results with the highest regeneration capacity and culture effects （94.86 and 92.5%） in the same dose of AGE These results indicated that effective dose of AGP in regeneration medium increase plant regeneration in calli derived from cereal mature embryos.

关键词： arabinogalactan-protein (AGP) cereal mature embryo plant regeneration tissue culture

Fabrication of Bioinspired Structured Superhydrophobic and Superoleophilic Copper Mesh for Efficient Oil-water Separation

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2017年第3期14卷 497-505页

作者： Yan Song Yan Liu Bin Zhan cigdem Kaya Thomas Stegmaier Zhiwu Han Luquan Ren Key Laboratory of Bionic Engineering (Ministry of Education) Jilin University Changchun 130022 China Institute of Textile Technology and Process Engineering Denkendorf University of Stuttgart Germany

Oily water treatment has attracted the attention of many researchers. The development of effective and cheap oil/water separation materials is urgent for treating this problem. Herein, inspired by superhydrophobic typical plant leaves such as lotus, red rose and marigold, superhydrophobic and superoleophilic copper mesh was fabricated by etching and then surface modi- fication with 1-dodecanethiol （HS（CH2）IlCH3）. A rough silver layer is formed on the mesh surface after immersion. The ob- tained mesh surface exhibits superhydrophobicity and superoleophilicity and the static water contact angle was 153~ ＋ 3~. In addition, the as-prepared copper mesh shows self-cleaning character with water and chemical stability. The as-prepared copper foam can easily remove the organic solvents either on water or underwater. We demonstrate that by using the as-prepared mesh, oils can be absorbed and separated, and that high separation efficiencies of larger than 92% are retained for various oils. Thus, such superhydrophobic and superoleophilic copper mesh is a very promising material for the application ofoil spill cleanup and industrial oily wastewater treatment.

关键词： bionic superhydrophobic oil-water separation superoleophilic copper mesh

Leptin treatment ameliorates acute lung injury in rats with cerulein-induced 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

World Journal of Gastroenterology 2007年第21期13卷 2932-2938页

作者： Fatma Ayca Gultekin Mustafa Kerem Ertan Tatlicioglu Aysel Aricioglu cigdem Unsal Neslihan Bukan Gazi University School of MedicineDepartment of General SurgeryBesevler 06510AnkaraTurkey Gazi University School of MedicineDepartment of BiochemistryBesevler 06510AnkaraTurkey Gazi University School of MedicineDepartment of PathologyBesevler 06510AnkaraTurkey

AIM:To determine the effect of exogenous leptin on acute lung injury (ALI) in cerulein-induced acute pancreatitis (AP). METHODS:Forty-eight rats were randomly divided into 3 groups. AP was induced by intraperitoneal (i.p.) injection of cerulein (50 μg/kg) four times,at 1 h intervals. The rats received a single i.p. injection of 10 μg/kg leptin (leptin group) or 2 mL saline (AP group) after cerulein injections. In the sham group,animals were given a single i.p. injection of 2 mL saline. Experimental samples were collected for biochemical and histological evaluations at 24 h and 48 h after the induction of AP or saline administration. Blood samples were obtained for the determination of amylase,lipase,tumor necrosis factor (TNF)-a,interleukin (IL)-1β,macrophage inflammatory peptide (MIP)-2 and soluble intercellular adhesion molecule (sICAM)-1 levels,while pancreatic and lung tissues were removed for myeloperoxidase (MPO) activity,nitric oxide (NOx) level,CD40 expression and histological evaluation. RESULTS:Cerulein injection caused severe AP,confirmed by an increase in serum amylase and lipase levels,histopathological findings of severe AP,and pancreatic MPO activity,compared to the values obtained in the sham group. In the leptin group,serum levels of MIP-2,sICMA-1,TNF-a,and IL-1b,pancreatic MPO activity,CD40 expression in pancreas and lung tissues,and NOx level in the lung tissue were lower compared to those in the AP group. Histologically,pancreatic and lungdamage was less severe following leptin administration. CONCLUSION:Exogenous leptin attenuates inflammatory changes,and reduces pro-inflammatory cytokines,nitric oxide levels,and CD40 expression in ceruleininduced AP and may be protective in AP associated ALI.

关键词： Leptin Acute pancreatitis Lung injury CD40 Cytokines

Natural convection effects on TNT solidification inside a shaped charge mold

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第9期18卷 1653-1661页

作者： cigdem Susantez Aldelio B.Caldeira Bruna R.Loiola Trakya University Engineering FacultyMechanical Engineering DepartmentEdirne22030Turkey Management and Technological Innovation Agency Brazilian ArmyRio de Janeiro23020-470Brazil Military Institute of Engineering Mechanical Engineering DepartmentRio de Janeiro22290-270Brazil

High Explosive Anti-Tank(HEAT) warheads and ammunitions are frequently produced by explosive casting inside an axis-symmetric mold with an inverted conical geometry in the basis. In order to prevent manufacturing defects, the solidification process must be controlled. In this study, a dimensionless solidification model has been proposed to investigate the heat transfer considering the natural convection inside the liquid explosive and the numerical simulations were performed by using COMSOL Multiphysics and Modeling Software, employing trinitrotoluene(TNT) thermophysical properties. The effect of three different boundary conditions on the top of the mold have been evaluated: convection, adiabatic and isothermal. It has been observed that solidification process was faster for convection case and slower for isothermal case, while an intermediary total solidification time value was found for adiabatic ***, liquid explosive was completely surrounded by solid explosive during the solidification process for convection case and also for adiabatic case through the end of the process. Otherwise, it was not observed for isothermal case. The natural convection effects promoted a vortex inside the liquid explosive, accelerating the heat transfer process. It has been concluded that isothermal mold top boundary condition should be preferred to prevent manufacturing defects, avoiding high thermal stress.

关键词： Solidification Natural convection Explosive Dimensionless model Anti-Tank ammunition