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  1. Article ; Online: New strategies for sterilization and preservation of fresh fish skin grafts.

    Ibrahim, Ahmed / Fahmy, Hossam M / Mahmoud, Ghada Abd-Elmonsef / Soliman, Mahmoud / Elshahawy, Abdelnaby M

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 1253

    Abstract: The introduction of fish skin as a biological dressing for treating burns and wounds holds great promise, offering an alternative to existing management strategies. However, the risk of disease transmission is a significant concern. Therefore, this study ...

    Abstract The introduction of fish skin as a biological dressing for treating burns and wounds holds great promise, offering an alternative to existing management strategies. However, the risk of disease transmission is a significant concern. Therefore, this study aimed to examine how established sterilization and preservation procedures affected fish skin grafts' microbiological and histological properties for long-term usage. Lyophilization of the fish skin graft followed by rehydration in normal saline for 15 min did not change the collagen content. Furthermore, gamma irradiation of the lyophilized fish skin graft at different lengths 5, 10, and 25 KGy showed a significant reduction in microbial growth (aerobic bacteria, aerobic yeasts, and fungi) at 15- and 30 days after the irradiation. However, exposure to 10 KGy was found to be the most effective intensity among the different gamma irradiation lengths since it preserved the collagen fiber content and intensity in the lyophilized fish skin grafts at 15- and 30 days after the irradiation. These findings provide efficient preservation and sterilization methods for long-term usage of the fresh Tilapia skin grafts used for biological dressings.
    MeSH term(s) Animals ; Skin Transplantation ; Preservation, Biological ; Freeze Drying ; Collagen ; Fishes ; Sterilization/methods ; Ichthyosis, Lamellar
    Chemical Substances Collagen (9007-34-5)
    Language English
    Publishing date 2024-01-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-51608-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The optimal concentration of silver nanoparticles in sterilizing fish skin grafts.

    Elshahawy, Abdelnaby M / Mahmoud, Ghada Abd-Elmonsef / Mokhtar, Doaa M / Ibrahim, Ahmed

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 19483

    Abstract: Collagen integrity should be considered on using a sterilizing agent for fish skin grafts. This study defined the optimal concentration of silver nanoparticles (Ag NPs) for sterilization of fish skin grafts without disrupting collagen content based on ... ...

    Abstract Collagen integrity should be considered on using a sterilizing agent for fish skin grafts. This study defined the optimal concentration of silver nanoparticles (Ag NPs) for sterilization of fish skin grafts without disrupting collagen content based on microbiological and histological evaluation. Strips of tilapia skin (n = 5) were randomly allocated to be immersed in Ag NPs solution at different concentrations of 25, 50, 100, and 250 µg/mL, respectively, for 5 min. The treated skin strips underwent bacteriological and histological evaluation. Yeast and fungi were more sensitive to Ag NPs than bacteria. On increasing the nanoparticles concentration, the total counts of aerobic bacteria decrease giving 933.3 ± 28.67, 601 ± 27.66, 288 ± 16.8, 15 ± 4.08 (CFU/cm
    MeSH term(s) Animals ; Humans ; Anti-Bacterial Agents/pharmacology ; Candida albicans ; Collagen/pharmacology ; Escherichia coli ; Metal Nanoparticles ; Microbial Sensitivity Tests ; Silver/pharmacology ; Skin Transplantation ; Sterilization
    Chemical Substances Anti-Bacterial Agents ; Collagen (9007-34-5) ; Silver (3M4G523W1G)
    Language English
    Publishing date 2022-11-14
    Publishing country England
    Document type Journal Article ; Randomized Controlled Trial
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-23853-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: 3D Printed Graphene-Based Metamaterials: Guesting Multi-Functionality in One Gain.

    Du, Junjie / Fu, Gangwen / Xu, Xi / Elshahawy, Abdelnaby M / Guan, Cao

    Small (Weinheim an der Bergstrasse, Germany)

    2023  Volume 19, Issue 19, Page(s) e2207833

    Abstract: Advanced functional materials with fascinating properties and extended structural design have greatly broadened their applications. Metamaterials, exhibiting unprecedented physical properties (mechanical, electromagnetic, acoustic, etc.), are considered ... ...

    Abstract Advanced functional materials with fascinating properties and extended structural design have greatly broadened their applications. Metamaterials, exhibiting unprecedented physical properties (mechanical, electromagnetic, acoustic, etc.), are considered frontiers of physics, material science, and engineering. With the emerging 3D printing technology, the manufacturing of metamaterials becomes much more convenient. Graphene, due to its superior properties such as large surface area, superior electrical/thermal conductivity, and outstanding mechanical properties, shows promising applications to add multi-functionality into existing metamaterials for various applications. In this review, the aim is to outline the latest developments and applications of 3D printed graphene-based metamaterials. The structure design of different types of metamaterials and the fabrication strategies for 3D printed graphene-based materials are first reviewed. Then the representative explorations of 3D printed graphene-based metamaterials and multi-functionality that can be introduced with such a combination are further discussed. Subsequently, challenges and opportunities are provided, seeking to point out future directions of 3D printed graphene-based metamaterials.
    Language English
    Publishing date 2023-02-09
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202207833
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Metal Phosphides and Phosphates-based Electrodes for Electrochemical Supercapacitors.

    Li, Xin / Elshahawy, Abdelnaby M / Guan, Cao / Wang, John

    Small (Weinheim an der Bergstrasse, Germany)

    2017  Volume 13, Issue 39

    Abstract: Phosphorus compounds, such as metal phosphides and phosphates have shown excellent performances and great potential in electrochemical energy storage, which are demonstrated by research works published in recent years. Some of these metal phosphides and ... ...

    Abstract Phosphorus compounds, such as metal phosphides and phosphates have shown excellent performances and great potential in electrochemical energy storage, which are demonstrated by research works published in recent years. Some of these metal phosphides and phosphates and their hybrids compare favorably with transition metal oxides/hydroxides, which have been studied extensively as a class of electrode materials for supercapacitor applications, where they have limitations in terms of electrical and ion conductivity and device stability. To be specific, metal phosphides have both metalloid characteristics and good electric conductivity. For metal phosphates, the open-framework structures with large channels and cavities endow them with good ion conductivity and charge storage capacity. In this review, we present the recent progress on metal phosphides and phosphates, by focusing on their advantages/disadvantages and potential applications as a new class of electrode materials in supercapacitors. The synthesis methods to prepare these metal phosphides/phosphates are looked into, together with the scientific insights involved, as they strongly affect the electrochemical energy storage performance. Particular attentions are paid to those hybrid-type materials, where strong synergistic effects exist. In the summary, the future perspectives and challenges for the metal phosphides, phosphates and hybrid-types are proposed and discussed.
    Language English
    Publishing date 2017-08-21
    Publishing country Germany
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ISSN 1613-6829
    ISSN (online) 1613-6829
    DOI 10.1002/smll.201701530
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Photosynthetic apparatus of Rhodobacter sphaeroides exhibits prolonged charge storage.

    Ravi, Sai Kishore / Rawding, Piper / Elshahawy, Abdelnaby M / Huang, Kevin / Sun, Wanxin / Zhao, Fangfang / Wang, John / Jones, Michael R / Tan, Swee Ching

    Nature communications

    2019  Volume 10, Issue 1, Page(s) 902

    Abstract: Photosynthetic proteins have been extensively researched for solar energy harvesting. Though the light-harvesting and charge-separation functions of these proteins have been studied in depth, their potential as charge storage systems has not been ... ...

    Abstract Photosynthetic proteins have been extensively researched for solar energy harvesting. Though the light-harvesting and charge-separation functions of these proteins have been studied in depth, their potential as charge storage systems has not been investigated to the best of our knowledge. Here, we report prolonged storage of electrical charge in multilayers of photoproteins isolated from Rhodobacter sphaeroides. Direct evidence for charge build-up within protein multilayers upon photoexcitation and external injection is obtained by Kelvin-probe and scanning-capacitance microscopies. Use of these proteins is key to realizing a 'self-charging biophotonic device' that not only harvests light and photo-generates charges but also stores them. In strong correlation with the microscopic evidence, the phenomenon of prolonged charge storage is also observed in primitive power cells constructed from the purple bacterial photoproteins. The proof-of-concept power cells generated a photovoltage as high as 0.45 V, and stored charge effectively for tens of minutes with a capacitance ranging from 0.1 to 0.2 F m
    MeSH term(s) Bioelectric Energy Sources/microbiology ; Electrochemistry ; Electromagnetic Phenomena ; Electron Transport/physiology ; Light-Harvesting Protein Complexes/metabolism ; Photosynthesis/physiology ; Rhodobacter sphaeroides/metabolism
    Chemical Substances Light-Harvesting Protein Complexes
    Language English
    Publishing date 2019-02-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-019-08817-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Strong Charge Transfer at 2H-1T Phase Boundary of MoS

    Ke, Qingqing / Zhang, Xiao / Zang, Wenjie / Elshahawy, Abdelnaby M / Hu, Yating / He, Qiyuan / Pennycook, Stephen J / Cai, Yongqing / Wang, John

    Small (Weinheim an der Bergstrasse, Germany)

    2019  Volume 15, Issue 21, Page(s) e1900131

    Abstract: Transition metal dichalcogenides exhibit several different phases (e.g., semiconducting 2H, metallic 1T, 1T') arising from the collective and sluggish atomic displacements rooted in the charge-lattice interaction. The coexistence of multiphase in a ... ...

    Abstract Transition metal dichalcogenides exhibit several different phases (e.g., semiconducting 2H, metallic 1T, 1T') arising from the collective and sluggish atomic displacements rooted in the charge-lattice interaction. The coexistence of multiphase in a single sheet enables ubiquitous heterophase and inhomogeneous charge distribution. Herein, by combining the first-principles calculations and experimental investigations, a strong charge transfer ability at the heterophase boundary of molybdenum disulfide (MoS
    Language English
    Publishing date 2019-04-24
    Publishing country Germany
    Document type Journal Article
    ISSN 1613-6829
    ISSN (online) 1613-6829
    DOI 10.1002/smll.201900131
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  7. Article ; Online: 2D Metal-Organic Frameworks Derived Nanocarbon Arrays for Substrate Enhancement in Flexible Supercapacitors.

    Liu, Ximeng / Guan, Cao / Hu, Yating / Zhang, Lei / Elshahawy, Abdelnaby M / Wang, John

    Small (Weinheim an der Bergstrasse, Germany)

    2017  Volume 14, Issue 43, Page(s) e1702641

    Abstract: Direct assembling of active materials on carbon cloth (CC) is a promising way to achieve flexible electrodes for energy storage. However, the overall surface area and electrical conductivity of such electrodes are usually limited. Herein, 2D metal- ... ...

    Abstract Direct assembling of active materials on carbon cloth (CC) is a promising way to achieve flexible electrodes for energy storage. However, the overall surface area and electrical conductivity of such electrodes are usually limited. Herein, 2D metal-organic framework derived nanocarbon nanowall (MOFC) arrays are successfully developed on carbon cloth by a facile solution + carbonization process. Upon growth of the MOFC arrays, the sites for growth of the active materials are greatly increased, and the equivalent series resistance is decreased, which contribute to the enhancement of the bare CC substrate. After decorating ultrathin flakes of MnO
    Language English
    Publishing date 2017-10-27
    Publishing country Germany
    Document type Journal Article
    ISSN 1613-6829
    ISSN (online) 1613-6829
    DOI 10.1002/smll.201702641
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Controllable MnCo2S4 nanostructures for high performance hybrid supercapacitors

    Elshahawy, Abdelnaby M / Li, Xin / Zhang, Hong / Hu, Yating / Ho, Kuan Hung / Guan, Cao / Wang, John

    Journal of materials chemistry A. 2017 Apr. 18, v. 5, no. 16

    2017  

    Abstract: Sulphospinel materials, such as MnCo2S4, are being widely investigated as a promising class of candidates for energy storage. The low electric conductivity and low surface area derived by the conventional processes have however limited their wide usage ... ...

    Abstract Sulphospinel materials, such as MnCo2S4, are being widely investigated as a promising class of candidates for energy storage. The low electric conductivity and low surface area derived by the conventional processes have however limited their wide usage as a class of low-cost materials for energy storage. In this work, sulphospinel MnCo2S4 nanostructures have been rationally synthesised through a carefully controlled sulphurization process, which expresses a desirable mesoporous feature with high electrical conductivity. They show much better electrical conductivity and pronounced improvement in the electrochemical performance with a high capacitance (938 F g−1 at 20 A g−1) and excellent cycling stability, where the specific capacitance could be retained at 95% of its original value after 5000 charge–discharge cycles. To further demonstrate the great potential of sulphospinel materials, a full-type supercapacitor was assembled with MnCo2S4 on carbon cloth as the positive electrode and a (Porous Carbon Polyhedron) PCP/rGO hydrogel as the negative electrode. The full cell shows a high energy density of 43 W h kg−1 at a power density of 0.801 kW kg−1, and 16.2 W h kg−1 can be retained at a power density of 26.5 kW kg−1. Excellent cycling stability is also achieved with 87% retention after 10 000 charge–discharge cycles, demonstrating great potential for next-generation high performance supercapacitors.
    Keywords capacitance ; carbon ; electrical conductivity ; electrochemistry ; electrodes ; energy ; energy density ; graphene oxide ; hydrogels ; nanomaterials ; porous media ; sulfides ; surface area
    Language English
    Dates of publication 2017-0418
    Size p. 7494-7506.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c7ta00943g
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: (Ni,Co)Se

    Li, Xin / Wu, Haijun / Guan, Cao / Elshahawy, Abdelnaby M / Dong, Yangtao / Pennycook, Stephen J / Wang, John

    Small (Weinheim an der Bergstrasse, Germany)

    2018  Volume 15, Issue 3, Page(s) e1803895

    Abstract: Supercapacitors (SCs) have been widely studied as a class of promising energy-storage systems for powering next-generation E-vehicles and wearable electronics. Fabricating hybrid-types of electrode materials and designing smart nanoarchitectures are ... ...

    Abstract Supercapacitors (SCs) have been widely studied as a class of promising energy-storage systems for powering next-generation E-vehicles and wearable electronics. Fabricating hybrid-types of electrode materials and designing smart nanoarchitectures are effective approaches to developing high-performance SCs. Herein, first, a Ni-Co selenide material (Ni,Co)Se
    Language English
    Publishing date 2018-12-17
    Publishing country Germany
    Document type Journal Article
    ISSN 1613-6829
    ISSN (online) 1613-6829
    DOI 10.1002/smll.201803895
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Metal-organic framework derived hollow CoS

    Guan, Cao / Liu, Ximeng / Elshahawy, Abdelnaby M / Zhang, Hong / Wu, Haijun / Pennycook, Stephen J / Wang, John

    Nanoscale horizons

    2017  Volume 2, Issue 6, Page(s) 342–348

    Abstract: Self-supported hollow nanoarrays with hierarchical pores and rich reaction sites are promising for advanced electrocatalysis. Herein, we report a rational design of novel ... ...

    Abstract Self-supported hollow nanoarrays with hierarchical pores and rich reaction sites are promising for advanced electrocatalysis. Herein, we report a rational design of novel CoS
    Language English
    Publishing date 2017-07-18
    Publishing country England
    Document type Journal Article
    ISSN 2055-6764
    ISSN (online) 2055-6764
    DOI 10.1039/c7nh00079k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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