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Antibiotic ciprofloxacin removal from aqueous solutions by electrochemically activated persulfate process:Optimization,degradation pathways,and toxicology assessment

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Journal of Environmental Sciences 2024年第9期143卷 85-98页

作者： Elif Yakamercan Ahmet Aygün halis Simsek Environmental Engineering Department Bursa Technical UniversityBursaTurkey Agricultural and Biological Engineering Department Purdue UniversityWest LafayetteINUSA

Ciprofloxacin(CIP)is a commonly used antibiotic in the fluoroquinolone group and is widely used in medical and veterinary medicine disciplines to treat bacterial *** CIP is discharged into the sewage system,it cannot be removed by a conventional wastewater treatment plant because of its recalcitrant *** this study,boron-doped diamond anode and persulfate were used to degrade CIP in an aquatic solution by creating an electrochemically activated persulfate(EAP)*** added to the system as a coactivator and the process was called EAP+*** effects of independent variables,including pH,Fe^(2+),persulfate concentration,and electrolysis time on the systemwere optimized using the response surface *** results showed that the EAP+Fe process removed 94%of CIP under the following optimum conditions:A pH of 3,persulfate/Fe^(2+)concentration of 0.4 mmol/L,initial CIP concentration 30 mg/L,and electrolysis time of 12.64 *** removal efficiency was increased from 65.10%to 94.35%by adding Fe^(2+)as a transition *** degradation products,7 pathways,and 78 intermediates of CIP were studied,and three of those intermediates(m/z 298,498,and 505)were *** toxicological analysis based on toxicity estimation software results indicated that some degradation products of CIP were toxic to targeted animals,including fathead minnow,Daphnia magna,Tetrahymena pyriformis,and *** optimumoperation costswere similar in EAP and EAP+Fe processes,approximately 0.54€/m^(3).

关键词： Ciprofloxacin Response surface methodology Electrochemically activated persulfate Electrooxidation

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Effects of plant growth regulators, carbon sources and pH values on callus induction in Aquilaria malaccensis leaf explants and characteristics of the resultant calli

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Journal of Forestry Research 2014年第3期25卷 535-540页

作者： Shashita JAYARAmAN Nurul Hazwani DAUD Rasmina halis Rozi mOHAmED Forest Biotech Laboratory Department of Forest Management Faculty of Forestry Universiti Putra Malaysia Department of Forest Production Faculty of Forestry Universiti Putra Malaysia

The endangered tropical tree, Aquilaria malaccensis, produces agarwood for use in fragrance and medicines. Efforts are currently un-derway to produce valuable agarwood compoundsn tissue culture. The purpose of this study was to develop an optimal growth medium, specif-ically, the best hormone combination for callus suspension culture. Using nursery-grown A. malaccensis, sterilized leaf explants were first incu-bated on basic murashige and Skoog （mS） gel medium containing 15g/L sucrose and at pH 5.7. Different auxin types including 1-naphthaleneacetic acid （NAA）, 2,4-dichlorophenoxyacetic acid （2,4-D）, and indole-3-butyric acid （IBA）, were tested at various concentrations （0.55, 1.1 and 1.65 μm） using the basic medium. Leaf explants were incubated for 30 days in the dark. Callus induced by 1.1 μm NAA had the highest biomass dry weight （DW） of 17.3 mg;however the callus was of a compact type. This auxin concentration was then combined with either 6-benzylaminopurine （BAP） or kinetin at 0.55, 1.1, 2.2 or 3.3 μm to induce growth of friable callus. The 1.1μm NAA＋2.2μm BAP com-bination produced friable callus with the highest biomass （93.3mg DW）. When testing the different carbon sources and pHs, sucrose at 15g/L and pH at 5.7 yielded highest biomasses at 87.7mg and 83mg DW, respec-tively. microscopic observations revealed the arrangement of the friable cells as loosely packed with relatively large cells, while for the compact callus, the cells were small and densely packed. We concluded that mS medium containing 15 g/L sucrose, 1.1 μm NAA ＋ 2.2 μm BAP hor-mone combination, and a pH of 5.7 was highly effective for inducing friable callus from leaf explants of A. malaccensis for the purpose of establishing cell suspension culture.

关键词： Agarwood endangered tree in vitro plant growth regulators,Thymelaeaceae

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Isolated Triquetrum Fractures: The Importance of Proper Roentgenograms in Ulnar Sided Wrist Pain

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Open Journal of Orthopedics 2015年第7期5卷 186-188页

作者： Guzelali Ozdemir Bekir Yavuz Ucar m. halis Cerci Baris Yilmaz Kerem Basarir Fatih Sultan mehmet Training and Research Hospital Istanbul Turkey Sisli Florence Nightingale Hospital Istanbul Turkey Safa Hospital Istanbul Turkey Ankara University School of medicine Ankara Turkey

Triquetrum fractures are the second most common carpal fractures after scaphoid. However they are seldom encountered due to their clinical symptoms and since they cause less functional disability. They can be misdiagnosed as soft-tissue injuries by considering the similar localization of pain and prolonged symptoms. The majority of triquetrum fractures can be diagnosed with direct X-ray. Obtaining three plane (anterior-posterior, lateral and oblique) X-rays is especially important in diagnosing dorsal chip fractures. Accurate diagnosis provides both controlling the symptoms with adequate immobilization, sufficient information of the patient in the acute period and preventing unnecessary diagnostic work up in the subacute period because of prolonged discomfort. In our study, fifteen patients with isolated triquetrum fractures admitted within six year period were presented with their clinical, radiological features and treatment outcomes.

关键词： Triquetrum Fracture Direct Lateral Roentgenogram

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再入飞行器迎风面边界层转捩的数值预估

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空气动力学学报 2000年第4期18卷 490-494页

作者：曹从咏 J.m.A.Longo R.Radespiel 南京理工大学南京210094 德国宇航中心设计空气动力学研究所(DLREA

基于求解三维Navier Stokes方程 ,首先数值预估了高超声速三维流动的边界层特性 ;采用已有的高超声速三维边界层转捩准则 ,即在转捩位置Reθ/me=常数 ,以及通过修正由ONERA提出的代数转捩模型 ,建立了预估三维边界层转捩的半经验数值技... 详细信息

基于求解三维Navier Stokes方程 ,首先数值预估了高超声速三维流动的边界层特性 ;采用已有的高超声速三维边界层转捩准则 ,即在转捩位置Reθ/me=常数 ,以及通过修正由ONERA提出的代数转捩模型 ,建立了预估三维边界层转捩的半经验数值技术并应用于三维Navier Stokes方程的求解。利用halis模型及相关的实验数据 ,首次进行了在m∞ =6时不同雷诺数及迎角的验证试验。预估结果表明 :在不考虑边界层横向流动的影响下 ,预估结果与实验相当吻合 ;同时从工程应用的角度来说 ,由于其较少的计算工作量和易于在Navier Stokes程序中实现。

关键词：高超声速流边界层转捩再入飞行器三维流动

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