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  1. Article ; Online: Antiproliferative Activity of Some Newly Synthesized Substituted Pyridine Candidates Using 4-(Aaryl)-6-(naphthalen-1-yl)-2-oxo-1,2-dihydropyridine-3-carbonitrile as Synthon.

    El-Sayed, Amira A / Elsayed, Elsayed A / Amr, Abd El-Galil E

    ACS omega

    2021  Volume 6, Issue 10, Page(s) 7147–7156

    Abstract: Herein, we used nicotinonitrile ... ...

    Abstract Herein, we used nicotinonitrile derivatives
    Language English
    Publishing date 2021-03-02
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.1c00202
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Low-cost potentiometric paper-based analytical device based on newly synthesized macrocyclic pyrido-pentapeptide derivatives as novel ionophores for point-of-care copper(ii) determination.

    Kamel, Ayman H / Amr, Abd El-Galil E / Almehizia, Abdulrahman A / Elsayed, Elsayed A / Moustafa, Gaber O

    RSC advances

    2021  Volume 11, Issue 44, Page(s) 27174–27182

    Abstract: A simple, cost-effective, portable and disposable paper-based analytical device is designed and fabricated for copper(ii) determination. All solid-state ion-selective electrodes (ISEs) for copper and a Ag/AgCl reference electrode were constructed and ... ...

    Abstract A simple, cost-effective, portable and disposable paper-based analytical device is designed and fabricated for copper(ii) determination. All solid-state ion-selective electrodes (ISEs) for copper and a Ag/AgCl reference electrode were constructed and optimized on the paper substrate. The copper electrodes were built using carbon nano-tube ink as a conductive substrate and an ion-to electron transducer. A suitable polymeric membrane is drop-cast on the surface of the conductive carbon ink window. The copper-sensing membrane is based on newly synthesized macrocyclic pyrido-pentapeptide derivatives as novel ionophores for copper detection. Under the optimized conditions, the presented all-solid-state paper-based Cu
    Language English
    Publishing date 2021-08-18
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d1ra04712d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Low-cost potentiometric paper-based analytical device based on newly synthesized macrocyclic pyrido-pentapeptide derivatives as novel ionophores for point-of-care copper(ii) determination

    Kamel, Ayman H. / Amr, Abd El-Galil E. / Almehizia, Abdulrahman A. / Elsayed, Elsayed A. / Moustafa, Gaber O.

    RSC advances. 2021 Aug. 18, v. 11, no. 44

    2021  

    Abstract: A simple, cost-effective, portable and disposable paper-based analytical device is designed and fabricated for copper(ii) determination. All solid-state ion-selective electrodes (ISEs) for copper and a Ag/AgCl reference electrode were constructed and ... ...

    Abstract A simple, cost-effective, portable and disposable paper-based analytical device is designed and fabricated for copper(ii) determination. All solid-state ion-selective electrodes (ISEs) for copper and a Ag/AgCl reference electrode were constructed and optimized on the paper substrate. The copper electrodes were built using carbon nano-tube ink as a conductive substrate and an ion-to electron transducer. A suitable polymeric membrane is drop-cast on the surface of the conductive carbon ink window. The copper-sensing membrane is based on newly synthesized macrocyclic pyrido-pentapeptide derivatives as novel ionophores for copper detection. Under the optimized conditions, the presented all-solid-state paper-based Cu²⁺-ISEs showed a Nernstian response toward Cu²⁺ ions in 30 mM MES buffer, pH 7.0 over the linear range of 5.0 × 10⁻⁷–1.0 × 10⁻³ M with a limit of detection of 8.0 × 10⁻⁸ M. The copper-based sensors exhibited rapid detection of Cu²⁺ ions with a short response time (<10 s). The selectivity pattern of these new ionophores towards Cu²⁺ ions over many common mono-, di- and trivalent cations was evaluated using the modified separate solution method (MSSM). The presented paper-based analytical device exhibited good intra-day and inter day precision. The presented tool was successfully applied for trace Cu²⁺ detection in real samples of serum and whole blood collected from different children with autism spectrum disorder. The data obtained by the proposed potentiometric method were compared with those obtained by the inductively-coupled plasma (ICP) as a reference method. The presented copper paper-based analytical-device can be considered as an attractive tool for point-of-care copper determination because of its affordability, vast availability, and self-pumping ability, particularly when combined with potentiometric detection.
    Keywords affordability ; autism ; blood serum ; carbon ; carbon nanotubes ; copper ; cost effectiveness ; detection limit ; ionophores ; pH ; point-of-care systems ; polymers ; rapid methods
    Language English
    Dates of publication 2021-0818
    Size p. 27174-27182.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/d1ra04712d
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Synthesis, Antimicrobial Activity and Molecular Docking of Novel Thiourea Derivatives Tagged with Thiadiazole, Imidazole and Triazine Moieties as Potential DNA Gyrase and Topoisomerase IV Inhibitors.

    Hashem, Heba E / Amr, Abd El-Galil E / Nossier, Eman S / Elsayed, Elsayed A / Azmy, Eman M

    Molecules (Basel, Switzerland)

    2020  Volume 25, Issue 12

    Abstract: To develop new antimicrobial agents, a series of novel thiourea derivatives incorporated with different ... ...

    Abstract To develop new antimicrobial agents, a series of novel thiourea derivatives incorporated with different moieties
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; DNA Gyrase/chemistry ; DNA Topoisomerase IV/antagonists & inhibitors ; DNA Topoisomerase IV/chemistry ; Escherichia coli/drug effects ; Escherichia coli/metabolism ; Gram-Negative Bacteria/drug effects ; Gram-Positive Bacteria/drug effects ; Imidazoles/chemistry ; Imidazoles/pharmacology ; Microbial Sensitivity Tests ; Molecular Docking Simulation ; Structure-Activity Relationship ; Thiadiazoles/chemistry ; Thiadiazoles/pharmacology ; Thiourea/analogs & derivatives ; Thiourea/chemistry ; Thiourea/pharmacology ; Topoisomerase II Inhibitors/chemistry ; Triazines/chemistry ; Triazines/pharmacology
    Chemical Substances Anti-Bacterial Agents ; Imidazoles ; Thiadiazoles ; Topoisomerase II Inhibitors ; Triazines ; imidazole (7GBN705NH1) ; DNA Topoisomerase IV (EC 5.99.1.-) ; DNA Gyrase (EC 5.99.1.3) ; Thiourea (GYV9AM2QAG)
    Language English
    Publishing date 2020-06-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules25122766
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  5. Book: Reliability engineering

    Elsayed, Elsayed A

    (Wiley series in systems engineering and management)

    2012  

    Author's details Elsayed A. Elsayed
    Series title Wiley series in systems engineering and management
    Keywords Reliability (Engineering)
    Language English
    Size XVII, 772 S., graph. Darst., 24 cm
    Edition 2. ed. [rev. and updated]
    Publisher Wiley
    Publishing place Hoboken, NJ
    Document type Book
    Note Includes indexes
    ISBN 9781118137192 ; 9781118309520 ; 1118137191 ; 1118309529
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  6. Article ; Online: Paper-Based Potentiometric Sensors for Nicotine Determination in Smokers' Sweat.

    Amr, Abd El-Galil E / Kamel, Ayman H / Almehizia, Abdulrahman A / Sayed, Ahmed Y A / Elsayed, Elsayed A / Abd-Rabboh, Hisham S M

    ACS omega

    2021  Volume 6, Issue 17, Page(s) 11340–11347

    Abstract: Herein, we describe for the first time, the design and fabrication of a novel nicotine paper-based sensor, in which a miniaturized paper reference electrode is integrated for potentiometric measurements. The paper-based sensors were designed using ... ...

    Abstract Herein, we describe for the first time, the design and fabrication of a novel nicotine paper-based sensor, in which a miniaturized paper reference electrode is integrated for potentiometric measurements. The paper-based sensors were designed using printed wax barriers to define the electrochemical cell and the sample zones. The electrodes were based on the use of the ion association complexes of the nicotinium cation (Nic) with either tetraphenylborate (TPB) or 5-nitrobarbiturate (NB) counter anions as sensing materials for nicotine recognition. A poly (3,4 ethylenedioxythiophene)/poly-(styrene sulfonate) (PEDOT/PSS) conducting polymer was used as an ion-to-electron transducer. The performance characteristics of the proposed sensors were evaluated and it revealed a rapid and stable response with a Nernstian slope of 55.2 ± 0.3 and 51.2 ± 0.6 mV/decade over the linear range of 1.0 × 10
    Language English
    Publishing date 2021-04-22
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.1c00301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: An all-solid-state potentiometric sensor modified with multi-walled carbon nanotubes (MWCNTs) for silicate assessment and water-quality testing.

    Amr, Abd El-Galil E / Kamel, Ayman H / Al-Omar, Mohamed A / Elsayed, Elsayed A / Sayed, Ahmed Y A / Abd-Rabboh, Hisham S M

    Analytical methods : advancing methods and applications

    2021  Volume 13, Issue 12, Page(s) 1495–1501

    Abstract: A simple and cost-effective approach is proposed for silicate ion determination. The approach is based on designing an all-solid-state potentiometric sensor. The plasticized polyvinyl chloride (PVC) membrane sensor is based on the ion-association complex ...

    Abstract A simple and cost-effective approach is proposed for silicate ion determination. The approach is based on designing an all-solid-state potentiometric sensor. The plasticized polyvinyl chloride (PVC) membrane sensor is based on the ion-association complex [Ni(bphen)
    Language English
    Publishing date 2021-03-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2515210-5
    ISSN 1759-9679 ; 1759-9660
    ISSN (online) 1759-9679
    ISSN 1759-9660
    DOI 10.1039/d1ay00061f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Application of hydrocyclones for continuous cultivation of SP-2/0 cells in perfusion bioreactors

    Elsayed Elsayed A / Wagner Roland

    BMC Proceedings, Vol 5, Iss Suppl 8, p P

    Effect of hydrocyclone operating pressure

    2011  Volume 65

    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2011-11-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  9. Article: Rapid and Accurate Validated Potentiometric Method for Bispyribac Herbicide Assessment in Rice and Agricultural Wastewater

    H. Kamel, Ayman / Almehizia, Abdulrahman A / Galal, Hoda R / Amr, Abd El-Galil E / Elsayed, Elsayed A

    Water. 2020 Aug. 06, v. 12, no. 8

    2020  

    Abstract: A new validated method based on potentiometric transduction for bispyribac herbicide assessment in commercial formulations, rice and wastewater samples is fabricated and characterized. Sensors are based in terms of their fabrication on tridodecyl methyl ... ...

    Abstract A new validated method based on potentiometric transduction for bispyribac herbicide assessment in commercial formulations, rice and wastewater samples is fabricated and characterized. Sensors are based in terms of their fabrication on tridodecyl methyl ammonium chloride (TDMAC) as recognition material. TDMAC was plasticized in a poly (vinyl chloride) (PVC) matrix to prepare the membrane. Under static modes of operation, the sensors revealed a Nernstian anionic slope of -63.6 ± 0.7 mV/decade within a linear range of 9.1 × 10⁻⁶–1.0 × 10⁻² in 50 mM phosphate buffer solution (PBS), pH7. The detection limit was 6.0 × 10⁻⁶ M. The sensor was successfully introduced in a flow-stream system revealing a Nernstian response of -53.8 ± 1.3 mV/decade over a linear range of 2 × 10⁻⁴–1.0 × 10⁻² M and lower detection limit of 5.6 × 10⁻⁵ M. The sampling rate was calculated to be (~42 sample/h). Validation of the assay method is presented in detail including accuracy, trueness, bias, between-day variability and within-day variability, and good performance characteristics of the method are obtained. The presented method was successfully introduced to bispyribac determination in different complex matrices such as commercial bispyribac sodium known as (Nominee-kz, 3% soluble liquid (SL)), rice samples and agricultural wastewater samples. The samples were analyzed successfully under both static and hydrodynamic modes of operation. The results obtained were in a good agreement with those obtained by the liquid chromatographic method.
    Keywords accuracy ; ammonium chloride ; assays ; bias ; bispyribac-sodium ; detection limit ; hydrodynamics ; liquid chromatography ; liquids ; phosphates ; rice ; sampling ; variability ; vinyl chloride ; wastewater ; water
    Language English
    Dates of publication 2020-0806
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    Note NAL-light
    ZDB-ID 2521238-2
    ISSN 2073-4441
    ISSN 2073-4441
    DOI 10.3390/w12082216
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: An all-solid-state potentiometric sensor modified with multi-walled carbon nanotubes (MWCNTs) for silicate assessment and water-quality testing

    Amr, Abd El-Galil E / Kamel, Ayman H / Al-Omar, Mohamed A / Elsayed, Elsayed A / Sayed, Ahmed Y. A / Abd-Rabboh, Hisham S. M

    Analytical methods. 2021 Apr. 1, v. 13, no. 12

    2021  

    Abstract: A simple and cost-effective approach is proposed for silicate ion determination. The approach is based on designing an all-solid-state potentiometric sensor. The plasticized polyvinyl chloride (PVC) membrane sensor is based on the ion-association complex ...

    Abstract A simple and cost-effective approach is proposed for silicate ion determination. The approach is based on designing an all-solid-state potentiometric sensor. The plasticized polyvinyl chloride (PVC) membrane sensor is based on the ion-association complex [Ni(bphen)₃]²⁺[SiO₃]²⁻ as a sensory recognition material. The sensor is modified with multi-walled carbon nanotubes (MWCNTs) as an ion-to-electron transducer material. The performance characteristics of the new silicate-selective electrode were evaluated using a potentiometric water-layer test, potentiometric measurements, impedance spectroscopy, and current-reversal chronopotentiometry. The developed electrodes exhibited a low detection limit (0.11 μg mL⁻¹) over a wide linear range (4.0 × 10⁻⁶ to 1.0 × 10⁻³ M) and near-Nernstian sensitivity (slope = −28.1 ± 1.4 mV per decade). They presented a very short response time (<5 s) over the pH range 6–12 and provided acceptable reliability, ease of design and miniaturization, and high potential stability, in addition to good accuracy and precision. The sensors exhibited enhanced selectivity for silicate over many common interfering anions, such as SO₄²⁻, NO₃⁻, CH₃COO⁻, CO₃²⁻, Cl⁻, S²⁻, and PO₄³⁻. These results could qualify the developed sensor to be used in a successful way for the trace determination of silicate ions in different matrices. The developed method was successfully applied to the potentiometric detection of silicate in different pre-packaged bottled drinking water samples.
    Keywords carbon nanotubes ; cost effectiveness ; detection limit ; dielectric spectroscopy ; electrodes ; pH ; poly(vinyl chloride) ; silicates ; transducers (equipment) ; water quality
    Language English
    Dates of publication 2021-0401
    Size p. 1495-1501.
    Publishing place The Royal Society of Chemistry
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2515210-5
    ISSN 1759-9679 ; 1759-9660
    ISSN (online) 1759-9679
    ISSN 1759-9660
    DOI 10.1039/d1ay00061f
    Database NAL-Catalogue (AGRICOLA)

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