Erişime Açık

Inorganic arsenic speciation in water samples by miniaturized solid phase microextraction using a new polystyrene polydimethyl siloxane polymer in micropipette tip of syringe system

Ali, Jamshed | Tüzen, Mustafa | Kazi,Tasneem G. | Hazer, Baki

The polymer, polystyrene polydimethyl siloxane was loaded into the micropipette tip of the syringe system as an adsorbent to developed miniaturized solid phase microextraction. Standard solutions of arsenate and arsenite were passed through the adsorbent loaded in micropipette tip to check the adsorption behaviors. It was observed that arsenate adsorbed on the polystyrene polydimethyl siloxane in the pH rang of 6–8, while arsenite was directly passed through the micropipette tip of syringe system. The adsorbed arsenate in micropipette tip of syringe system were eluted by 1.0 M hydrochloric aci ...Daha fazlası

Makale 2016 Talanta161 , pp. 4 - 458 702 Görüntülenme

Solid phase microextraction method using a novel polystyrene oleic acid imidazole polymer in micropipette tip of syringe system for speciation and determination of antimony in environmental and food samples

Panhwar, Abdul Haleem | Tüzen, Mustafa | Hazer, Baki | Kazi, Tasneem Gul

A simple, rapid and sensitive solid phase microextraction method was used for the speciation of inorganic antimony (Sb) by using a novel synthesized polymeric material in micropipette tip of syringe system. In present methodology, the specie of Sb (III) made hydrophobic complex with diethyl dithiocarbamate (DDTC) at pH 5.5 and subsequently adsorbed on polystyrene oleic acid imidazole polymer (POIP), whereas Sb(V) did not made complex and adsorbed on the polymer, remained in aqueous solutions. The strategy of multivariate was carried out to screen out the different variables and assessed the op ...Daha fazlası

Makale 2018 Talanta184 , pp. 1 - 121 618 Görüntülenme

Sorption of acid dyes from aqueous solution by using non-ground ash and slag

Genç, Ayten | Oğuz, Aşkın

The sorption of two acid dyes (Acid Yellow 99 and Acid Red 183) into locally available industrial waste materials, namely, Granulated Blast Furnace Slag (GBFS) and Furnace Bottom Ash (FBA), has been investigated by performing batch equilibrium experiments with pH, ionic conductivity, initial dye concentration and temperature as variables. The kinetic sorption data indicated that the sorption capacity of GBFS for these dyes was almost zero. On the other hand, the color removal efficiency for FBA could reach 50% depending on the initial dye concentration. It was also found that the kinetics of s ...Daha fazlası

Makale 2010 Desalination264 ( 01.Feb ) , pp. 7 - 83 157 Görüntülenme

Early prediction of paroxysmal atrial fibrillation based on short-term heart rate variability

Narin, Ali | İşler, Yalçın | Özer, Mahmut | Perc, Matjaž

Atrial fibrillation (AF) is the most common arrhythmia type and its early stage is paroxysmal atrial fibrillation (PAF). PAF affects negatively the quality of life by causing dyspnea, chest pain, feeling of excessive fatigue, and dizziness. In this study, our aim is to predict the onset of paroxysmal atrial fibrillation (PAF) events so that patients can take precautions to prevent PAF events. We use an open data from Physionet, Atrial Fibrillation Prediction Database. We construct our approach based on the heart rate variability (HRV) analysis. Short-term HRV analysis requires 5-minute data so ...Daha fazlası

Makale 2018 Physica A: Statistical Mechanics and its Applications509 , pp. 5 - 65 909 Görüntülenme

Coexistence of cervico-thoracic extradural en-plaque meningioma with multiple intracranial meningiomas

Kale A. | Akyol Ç. | Keskin E. | AydoğmuŞ E. | Ali Aydin H. | Barut F. | Gül Ş.

Meningioma is one of the most common tumors in the spinal cord. Extradural and en-plaque variety of meningioma occur less frequently. A 47-year-old woman is presented with radiculopathy signs. Magnetic resonance imaging revealed a lesion from C6 through T3 vertebral levels compressing the cord both anteriorly and posteriorly. Subtotally excision was performed and histopathologic signs showed transitional type of meningioma (WHO Grade 1). Post operatively, she had good neurological recovery. Intraoperative findings point out that the en-plaque meningioma was pure extradural. Twelve cases of pur ...Daha fazlası

Makale 2014 Neurologia i Neurochirurgia Polska48 ( 5 ) , pp. 3 - 367 847 Görüntülenme

Effects of electromagnetic induction on vibrational resonance in single neurons and neuronal networks

Baysal, Veli | Yılmaz, Ergin

In this paper, Vibrational Resonance (VR), in which the response of some dynamical systems to a weak, low frequency signal can be enhanced by the optimal amplitude of high frequency signal, is investigated under the effects of electromagnetic induction in both single neurons and small-world networks. We find that the occurrence of VR in single neurons requires less energy in the presence of electromagnetic induction, although the resonant peak of the response reduces. Besides, VR can be obtained in small-world networks both with and without electromagnetic induction. In small-world neuronal ne ...Daha fazlası

Makale 2020 Physica A: Statistical Mechanics and its Applications537 764 Görüntülenme

Autaptic pacemaker mediated propagation of weak rhythmic activity across small-world neuronal networks

Yılmaz, Ergin | Baysal, Veli | Özer, Mahmut | Perc, Matjaž

We study the effects of an autapse, which is mathematically described as a self-feedback loop, on the propagation of weak, localized pacemaker activity across a Newman-Watts small-world network consisting of stochastic Hodgkin-Huxley neurons. We consider that only the pacemaker neuron, which is stimulated by a subthreshold periodic signal, has an electrical autapse that is characterized by a coupling strength and a delay time. We focus on the impact of the coupling strength, the network structure, the properties of the weak periodic stimulus, and the properties of the autapse on the transmissi ...Daha fazlası

Makale 2016 Physica A: Statistical Mechanics and its Applications444 , pp. 5 - 546 1124 Görüntülenme

Effects of autapse and ion channel block on the collective firing activity of Newman–Watts small-world neuronal networks

Uzun, Rukiye | Yılmaz, Ergin | Özer, Mahmut

An autapse is a special kind of synapse established between the axon and dendrites of the same neuron. In the present study, we have investigated the cooperative effects of autapse and ion channel block on the collective firing regularity of Newman–Watts small-world networks of stochastic Hodgkin–Huxley neurons. We obtain autaptic time delay induced multi-coherence resonance (MCR) phenomenon in the absence of ion channel block. When the ion channel block is considered, we find that this autaptic delay induced MCR phenomenon enhances with the increasing of potassium channel block, whereas it we ...Daha fazlası

Makale 2017 Physica A: Statistical Mechanics and its Applications486 , pp. 3 - 396 979 Görüntülenme

Does Type 2 Diabetes Mellitus Affect the Healing of Bell's Palsy in Adults?

Şevik Eliçora S. | Erdem D.

Objectives: Bell's palsy (BP) is defined as an acute facial weakness of unknown cause. Many factors affecting the healing of BP have been identified; 1 factor commonly considered relevant is the presence of type 2 diabetes mellitus. Our aim was to investigate the effects of diabetes on the healing of BP. Methods: Sixty patients with BP were followed up for 1 to 3 years and were divided into 2 groups, those with and those without type 2 diabetes. All were prescribed prednisone (initially 1 mg/kg per day, with a tapered dose reduction) and acyclovir (200 mg orally every 4 h, 5 times daily, for 5 ...Daha fazlası

Makale 2018 Canadian Journal of Diabetes42 ( 4 ) , pp. 4 - 436 561 Görüntülenme

Nanostructured alkyl carboxylic acid-based restricted access solvents: Application to the combined microextraction and cleanup of polycyclic aromatic hydrocarbons in mosses

Caballero-Casero N. | Çabuk H. | Martínez-Sagarra G. | Devesa J.A. | Rubio S.

Alkyl carboxylic acid-based nanostructured solvents, synthesized in mixtures of tetrahydrofuran (THF) and water through self-assembly and coacervation, were proved to behave as restricted access liquids. Both physical and chemical mechanisms were found responsible for exclusion of macromolecules such as proteins and polysaccharides. The potential of these solvents for extracting small molecules from complex solid samples, without interference from large biomolecules, was here evaluated. For this purpose, they were applied to the extraction of 14 priority polycyclic aromatic hydrocarbons (PAHs) ...Daha fazlası

Makale 2015 Analytica Chimica Acta890 , pp. 1 - 133 353 Görüntülenme

Lipase-based on starch material as a development matrix with magnetite cross-linked enzyme aggregates and its application

Mehde A.A. | Mehdi W.A. | Severgün O. | Çakar S. | Özacar M.

The Fe 3 O 4 magnetic nanoparticles were prepared by precipitating ferrous ion (Fe 2+ ) and ferric ion (Fe 3+ ) in alkaline solution. The Fe 3 O 4 magnetic nanoparticles were modified by tannic acid. After functionalization process, two methods were used to immobilize Lipase on Fe 3 O 4 magnetic nanoparticles. In the first method, novel tannic acid magnetic cross-linked enzyme aggregates of lipase (TA-MNPs-CLEAs) were synthesized by cross-linking of lipase aggregates and starch as co-feeder with Fe 3 O 4 magnetic nanoparticles improved by tannic acid (TA-MNPs). In the second method, the lipase ...Daha fazlası

Makale 2018 International Journal of Biological Macromolecules120 , pp. 1 - 1543 253 Görüntülenme

Horizontal Parking Control of Autonomous Underwater Vehicle, FOLOGA

Kartal S.K. | Casalino G.

In this study, a velocity field control algorithm and an optimal autopilot algorithm are developed for horizontal parking system motion of Fologa which is an autonomous unmanned underwater survey vehicle and manufactured by Graaltech Ltd., Genoa, Italy. Firstly, a nonlinear mathematical model for Fologa is obtained. The structure of the mathematical model of the vehicle comes from a Newton-Euler formulation. The resultant nonlinear system is then controlled by PID controllers. These PID controllers are designed for horizontal parking motion which is realized by a suitable combination of rear a ...Daha fazlası

Konferans Nesnesi 2019 IFAC-PapersOnLine52 ( 8 ) , pp. 9 - 104 324 Görüntülenme

Filtreler

Koleksiyon [21]

İlgili Araştırmacılar [34]

Ambargo Durumu [1]

Tam Metin [2]

Yazar [90]

Yayın Türü [5]

Yayın Yılı [11]

Yayın Dili [1]

Dergi Adı [48]

Yayıncı [1]

Konu Başlıkları [90]