检索结果-南通市图书馆

Antioxidant and ɑ-glucosidase activities and phytochemical constituents of Chrysanthoglossum trifurcatum(Desf.)

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

Asian Pacific Journal of Tropical Medicine 2018年第4期11卷 285-291页

作者： Ahlem ben sassi Sana Amroussi Malek Besbes Mahjoub Aouni Fethia Skhiri Laboratory of Transmissible Diseases and Biologically Active Substances Department of Microbiology Faculty of Pharmacy University of Monastir Laboratory of Genetics Biodiversity and Valorisation of Bioresources Higher Institute of Biotechnology University of Monastir

Objective: To investigate the antioxidant and ɑ-glucosidase properties and phytochemical constituents of roots, stems, leaves and flowers extracts and aerial parts oil of Chrysanthoglossum trifurcatum(Desf.)(C. trifurcatum). Methods: For extraction from roots, stems, leaves and flowers of C. trifurcatum, methanol, ethyl acetate and petroleum ether solvents were used. Phenols, flavonoids, flavonols and tannins contents were evaluated. More, C. trifurcatum aerial parts oil composition was determined using chromatography/mass spectrometry. The antioxidant effect was estimated by DPPH, ABTS and reducing power test systems. The ɑ-glucosidase inhibition was determined by colorimetric assay using the enzyme from Aspergillus niger and the p-nitrophenyl glucopyranoside(pNPG) as substrate. Results: The highest amounts of polyphenols, flavonoids, flavonols and tannins were shown by the methanolic extract of leaves. The main components of the aerial parts oil were limonene(29.21%), γ-terpinene(12.96%), 4-terpenyl acetate(12.18%) and ɑ-pinene(5.76%). The activity evaluated by DPPH, ABTS and reducing power tests was important for stems(IC_(50)=0.68 mg/mL) and flowers(IC_(50)=0.67 mg/mL) methanolic extracts and essential oil(IC_(50)=0.72 mg/mL). Findings of ɑ-glucosidase activity revealed that petroleum ether extracts of leaves and roots together with aerial parts oil showed a highest activity with IC_(50) of 0.044, 0.045 and 0.049 mg/m L, respectively. Conclusions: Observed antioxidant and ɑ-glucosidase activities of oil and extracts are attributed to the presence of the active phytochemicals in C. trifurcatum organs. Thus, the C. trifurcatum can be used as a source of antioxidant compounds and dietary supplement to treat patients with type 2 diabetes.

关键词： Antioxidant ɑ-glucosidase Phenolic content Oil Chrysanthoglossum trifurcatum

Wastewater treatment by catalytic wet air oxidation process over AI-Fe pillared clays synthesized using microwave irradiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2018年第1期12卷 57-63页

作者： Halima sassi Gwendoline Lafaye Hedi ben Jacques Amor Abdelaziz Gannouni Mohamed Razak Jeday Barbier-Jr Institute of Chemistry of Poitiers University of Poitiers 86073 Poitiers Cedex 9 France Research Unit of Energy and Environment Gabes National Engineering School of Gabes （ENIG） 6029 Zrig Gabes Tunisia

Microwave irradiation has been used to prepare AI, Fe-pillared clays from a natural Tunisian smcctitc from the E1 Hicha deposit （province of Gabes）. Chemical analysis, XRD spectra and surface properties evidenced the success of pillaring process. The obtained solids present higher surthce area and pore volume than conventionally prepared A1-Fe pillared clays. The main advantages of the microwave methodology are the considerable reduction of the synthesis time and the consumption of water. The microwave-derived AI-Fe pillared clays have been tested tbr catalytic wet air oxidation （CWAO） of phenol in a stirred tank at 160℃ and 20 bar of pure oxygen pressure. These materials are efficient for CWAO of phenol and are highly stable despite the severe operating conditions （acidic media, high pressure, high temperature）. The catalyst deactivation was also significantly hindered when compared to conventionally prepared clays. A1-Fe pillared clays prepared by microwave methodology are promising as catalysts for CWAO industrial water treatment.

关键词： WaterCatalytic wet air oxidationPillared claysMicrowavePhenol

Role of Coelioscopy in the Etiologic Diagnosis of Exudative Ascites of Unknown Origin of the Women

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 Cancer Therapy 2015年第5期6卷 466-471页

作者： Mohamed ben Mabrouk Aida ben Slama Trabelsi Mohamed ben Rejeb Hanène Jaziri Mehdi Ksiaa sassi Bouguizane Badreddine Sriha Ali Jmaa Ali ben Ali Department of Digestive Surgery Sahloul Hospital Sousse Tunisia Department of Gastroenterology Sahloul Hospital Sousse Tunisia Department of Preventive Medicine Sahloul Hospital Sousse Tunisia Department of Gynecology Farhat Hached Hospital Sousse Tunisia Department of Pathology Farhat Hached Hospital Sousse Tunisia

Introduction: The aim of this study was to clarify the role of laparoscopy in the etiological diagnosis of exudative ascites of unknown origin in women. Materials and Methods: This?was?a prospective study from 2007 to 2012, including 83 women with exudative ascites of unknown origin and had a laparoscopy diagnostic purpose. Results: Carcinomatosis and peritoneal tuberculosis were the two most common causes found in 31% (26 cases) and 66% (55 cases) of cases respectively. The average age of the patients was 56 years. Weight loss and abdominal pain were the most frequent, observed symptoms in 71 cases (85.5%) and 53 cases (63.8%) respectively. The CT scan abnormalities noted?were a peritoneal thickening in 32 cases (38.5%), peritoneal nodules in 15 cases (18%), and agglutination of the digestive handles in 12 cases (14.4%). Laparoscopic Visual diagnosis was in favor of a peritoneal carcinomatosis in 32 cases (38.5%), peritoneal tuberculosis in 45 cases (54.2%), and non specific infection in 6 cases (7.3%). The histological diagnosis was a peritoneal carcinomatosis in 26 cases (31%), and peritoneal tuberculosis in 55 cases (66%). The positive predictive value of laparoscopic vision Diagnostics in Peritoneal tuberculosis was 100% and the negative predictive value was 73.7%. In peritoneal carcinomatosis, the positive predictive value was 81.3% and the negative predictive value was 100%. Conclusion: The etiologic diagnosis of exudative ascites in women is difficult despite the availability of several tests. Currently, laparoscopy with peritoneal biopsy remains the gold standard for etiologic diagnosis.

关键词： Ascites Exudative Laparoscopy Peritoneal Tuberculosis Peritoneal Carcinomatosis

Aerodynamic Performances of Wind Turbine Airfoils Using a Panel Method

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 Environmental Science and Engineering 2011年第9期5卷 1175-1182页

作者： M.M. Oueslati A.W. Dahmouni M. ben Salah F. Askri C. Kerkeni S. ben nasrallah Laboratory of Wind Energy Management and Waste Energy Recovery Research and Technology Center of Energy Hammam Lif 2050 Tunisia Laboratory of Thermal Process Research and Technology Center of Energy Hammam Lif 2050 Tunisia Laboratory of Studies of Thermal and Energy Systems National Engineering School of Monastir Monastir 5019 Tunisia

One of the key features of Laplace＇s Equation is the property that allows the equation governing the flow field to be converted from a 3D problem throughout the field to a 2D problem for finding the potential on the surface. The solution is then found using this property by distributing ＂singularities＂ of unknown strength over discretized portions of the surface： panels. Hence the flow field solution is found by representing the surface by a number of panels, and solving a linear set of algebraic equations to determine the unknown strengths of the singularities. In this paper a Hess-Smith Panel Method is then used to examine the aerodynamics of NACA 4412 and NACA 23015 wind turbine airfoils. The lift coefficient and the pressure distribution are predicted and compared with experimental result for low Reynolds number. Results show a good agreement with experimental data.

关键词： Panel method wind turbine airfoils incompressible potential flow pressure distribution

beneficial Effect of an Oral Antioxidant Supplementation (Fertimax2) on IVF-ICSI Outcomes: A Preliminary Clinical Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Reproductive Sciences 2014年第3期2卷 47-56页

作者： Olfa Kacem Meriem Harzallah Chekib Zedini Ines Zidi Sawsen Meddeb Meriem Fékih Habib Saidi Anouar Chaib sassi Boughizane Habib ben Ali Mohamad Bibi Ali Saad Hédi Khairi Mounir Ajina Department of Obstetrics and Gynaecology University Hospital F. Hached Sousse Tunisia Laboratories of Cytogenetic Molecular Biology and Human Biology of Reproduction F Hached Hospital Sousse Tunisia Service of Community Medicine Faculty of Medicine Sousse Tunisia Unit of Reproductive Medicine University Hospital F Hached Sousse Tunisia

Background: Considerable evidence points towards a significant role of oxidative stress (OS) in the pathogenesis of sperm dysfunction. OS as a result of an inappropriate balance between oxidants and antioxidants in the semen can cause DNA damage and lipid peroxidation leading to failure of conception, miscarriage or potentially even childhood cancer. The objective of this study was to investigate whether a male antioxidant therapy can improve semen parameters and the results of in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI). Methods: A total of forty eight infertile couples were considered. Male participants were administrated Fertimax2 antioxidant treatment for at least two months prior to their partner’s IVF-ICSI cycle. Sperm parameters (volume, concentration, progressive motility) and the IVF-ICSI outcomes were compared before and after the antioxidant treatment. The primary outcome measures were oocyte fertilization, cleavage and good embryo quality rates;the secondary outcomes were biochemical pregnancies, clinical pregnancies and implantation rates. Results: The principal finding that emerged from this study was that antioxidant therapy resulted in significant improvements in fertilization (p = 00.2), cleavage (p = 0.004) and good-embryo quality (p = 0.002) rates accompanied by a marked increase in clinical pregnancy (18.7% versus 2.5%) and implantation (11.8% versus 1.02%) rates. No significant changes in routine sperm parameters were observed. Conclusion: The Fertimax2 antioxidant therapy appears to influence favorably chances of conception in couples undergoing assisted reproduction treatment (ART).

关键词： Sperm Oxidative Stress Antioxidants Infertility Treatment IVF-ICS

陪伴渐进式村庄建设规划及实施的经验探索——以常州市龙王庙特色田园乡村创建为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

小城镇建设 2020年第11期38卷 92-99页

作者：栾峰殷清眉杨犇廖航同济大学建筑与城市规划学院上海同济城市规划设计研究院有限公司中国乡村规划与建设研究中心中国城市规划设计研究院上海分院规划四所

乡村规划的编制及建设实施过程,应从乡村振兴战略实施层面理解空间布局调整和项目建设实施背后的利益关系调整,采取陪伴渐进的方式,动员村民和多方外来机构及人才,重塑乡村集体能力,为后续村庄集体的可持续提升改善发展奠定良好基础。... 详细信息

乡村规划的编制及建设实施过程,应从乡村振兴战略实施层面理解空间布局调整和项目建设实施背后的利益关系调整,采取陪伴渐进的方式,动员村民和多方外来机构及人才,重塑乡村集体能力,为后续村庄集体的可持续提升改善发展奠定良好基础。本文结合常州市新北区西夏墅镇梅林村龙王庙创建江苏省特色田园乡村案例,秉承陪伴渐进式规划理念,从5个方面归纳总结陪伴渐进式建设规划及实施的实践经验,包括引智与开拓并举,提升草业经济水平和延伸产业模式;导控与放开并举,打造更多设计和建设单位示范项目以扩大推广并发展考察经济;鼓励与奖励并举,渐进发动更多村民参与庭院农宅整治及整体乡村风貌塑造;探索低效用地盘活与构筑平台引入发展资源并举,共同推动乡村新经济发展;渐进探索,从湿垃圾就地肥化到创新有机种植和精准扶贫的典型案例。

关键词：乡村振兴村庄规划陪伴式规划渐进式规划特色田园乡村龙王庙村